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

Abstract

A pressure relief component, a battery cell, a battery, and an electric device, which belong to the technical field of batteries. The pressure relief component is used for a battery cell; the pressure relief component is provided with at least two pressure relief notches, each pressure relief notch and connecting lines at the two ends of said notch enclosingly form a first region, the plurality of first regions are arranged at intervals, and a connecting line of at least one first region is located on the side of the first region near the center of the pressure relief component. The described design allows an opening having a larger area to be formed when the pressure relief component opens while also lowering the risk of a battery short circuit caused by the connection of the pressure relief component with another component in the battery. The risk of the area of the formed opening when the pressure relief component opens being too small due to a part within a first region being blocked by another part of the housing of the battery cell is likewise reduced, and the reliability of the battery is improved.

Description

Pressure relief components, battery cells, batteries and electrical equipment Technical Field

[0001] 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

[0002] Batteries are widely used in electronic devices such as electric vehicles, electric cars, electric airplanes, electric ships, etc.

[0003] How to improve battery reliability is an urgent problem to be solved in battery technology.

[0004] Summary of the Invention

[0005] In view of the above problems, the present application provides a pressure relief component, a battery cell, a battery and an electrical device, which can improve the reliability of the battery.

[0006] In the first aspect, the present application provides a pressure relief component, which is used for a battery cell. The pressure relief component is provided with at least two pressure relief notches, each pressure relief notch and the line connecting the two ends of the pressure relief notch form a first area, and multiple first areas are arranged at intervals, and the line connecting at least one first area is located on the side of the first area close to the center of the pressure relief component.

[0007] In the technical solution of the embodiment of the present application, when the battery cell is depressurized, the pressure relief notch will crack, causing the pressure relief component to form an opening for gas to pass smoothly. The pressure relief component is provided with at least two pressure relief notches, and each pressure relief notch and the connecting line at both ends of the pressure relief notch enclose a first area, and multiple first areas are arranged at intervals. Such a design can form an opening with a larger area when the pressure relief component is opened, while reducing the risk of partial pressure relief component overlapping with other components in the battery, causing a short circuit in the battery, thereby improving the reliability of the battery. The connecting line of at least one first area is located on the side of the first area close to the center of the pressure relief component, which can reduce the risk of the portion of the pressure relief component located in the first area being blocked by other parts of the battery cell shell when the pressure relief component is opened, resulting in the formation of an opening area that is too small.

[0008] In some embodiments, multiple first regions are spaced around the center of the pressure relief component, and each pressure relief notch is bent away from the center of the pressure relief component. This design reduces the risk that the portion of the pressure relief component located within the first region will be blocked by the portion within the adjacent first region when the pressure relief component is opened, resulting in an excessively small opening area.

[0009] In some embodiments, the thickness of the pressure relief component at the pressure relief notch is T1, satisfying: T1 ≥ 0.03 mm. Setting the thickness of the pressure relief component at the pressure relief notch within a reasonable range can make the pressure relief notch more likely to rupture when the battery cell is depressurized, thereby allowing the battery cell to release pressure smoothly.

[0010] In some embodiments, the pressure relief component is provided with at least two connecting notches, each corresponding to a pressure relief notch. The two ends of each pressure relief notch are connected by a connecting notch, and the thickness of the pressure relief component at the connecting notch is greater than the thickness of the pressure relief component at the pressure relief notch. When the battery cell releases pressure, the pressure relief notch will rupture before the connecting notch. Part of the pressure relief component can open along the connecting notch, or it can flip around along the connecting notch, shortening the time it takes to form an opening of a predetermined area and achieving rapid pressure relief.

[0011] In some embodiments, the thickness of the pressure relief component at the connection notch is T2, satisfying the following: T2 ≥ 0.04 mm. Setting the thickness of the pressure relief component at the pressure relief notch within a reasonable range allows the pressure relief component to open more easily along the connection notch when the battery cell is depressurized, while the connection notch ruptures later than the pressure relief notch. This shortens the time it takes to form an opening of a predetermined area, achieving rapid pressure relief.

[0012] In some embodiments, the first region is provided with a reinforcement notch, and the thickness of the pressure relief component at the reinforcement notch is greater than the thickness of the pressure relief component at the pressure relief notch. When the battery cell releases pressure, the pressure relief notch will crack before the reinforcement notch. The reinforcement notch can reduce the risk of wrinkling the opened portion of the pressure relief component, resulting in an opening area that is too small and poor venting.

[0013] In some embodiments, the thickness of the pressure relief component at the reinforcing notch is T3, satisfying the following: T3 ≥ 0.04 mm. Setting the thickness of the pressure relief component at the pressure relief notch within a reasonable range ensures that, when the battery cell is depressurized, the reinforcing notch ruptures later than the pressure relief notch, while the strength of the pressure relief component at the reinforcing notch is higher than that of the pressure relief component at the pressure relief notch. This reduces the risk of wrinkling of the opened portion of the pressure relief component, resulting in an excessively small opening area and poor venting.

[0014] In some embodiments, the pressure relief component has a first surface and a second surface disposed opposite each other along its thickness. The first surface is provided with a groove recessed toward the second surface. A pressure relief notch is provided on the bottom wall of the groove, and multiple pressure relief notches are spaced circumferentially along the sidewalls of the groove. When the battery cell releases pressure, the multiple pressure relief notches are spaced circumferentially along the sidewalls of the groove, which facilitates a larger opening formed when the pressure relief component is opened, allowing for smoother and more rapid exhaust.

[0015] In some embodiments, the at least two pressure relief notches include a first pressure relief notch and a second pressure relief notch. Both the first and second pressure relief notches are bent away from the center of the pressure relief component. The first pressure relief notch has a first end and a second end, while the second pressure relief notch has a third end proximate the first end and a fourth end proximate the second end. The first end and the third end are spaced apart, while the second end and the fourth end are spaced apart. When the battery cell releases pressure, both the first and second pressure relief notches are bent away from the center of the pressure relief component. This reduces the risk of the pressure relief portion defined by the first and second pressure relief notches being blocked by other parts of the housing, resulting in an excessively small opening area. The first pressure relief notch has a first end and a second end, while the second pressure relief notch has a third end proximate the first end and a fourth end proximate the second end. The first end and the third end are spaced apart, while the second end and the fourth end are spaced apart. This design reduces the risk of the pressure relief portion defined by the first and second pressure relief notches, upon opening, interfacing with other battery components and causing a battery short circuit, thereby improving battery reliability.

[0016] In some embodiments, the pressure relief component is further provided with a first connecting notch, one end of the first connecting notch being connected to the first end, and the other end of the first connecting notch being connected to the second end. The first connecting notch and the first pressure relief notch enclose a first pressure relief region, and the thickness of the pressure relief component at the first connecting notch is greater than the thickness of the pressure relief component at the first pressure relief notch. When the battery cell releases pressure, the first pressure relief notch will rupture before the first connecting notch, and the first pressure relief region can open along the first connecting notch, shortening the time it takes for the first pressure relief region to open, thereby achieving rapid pressure relief.

[0017] In some embodiments, at least one first reinforcement notch is provided within the first pressure relief region. The thickness of the pressure relief component at the first reinforcement notch is greater than the thickness of the pressure relief component at the first pressure relief notch. The first reinforcement notch is connected to the first pressure relief notch and / or the first connection notch. When the battery cell releases pressure, the first pressure relief notch will rupture before the first reinforcement notch. The first reinforcement notch can reduce the risk of wrinkling the portion of the pressure relief component located in the first pressure relief region after opening, resulting in an excessively small opening area in the first pressure relief region and poor air discharge.

[0018] In some embodiments, the first reinforcement score is connected at both ends to the first pressure relief score and the first connection score, respectively. This design can further reduce the risk of wrinkling in the portion of the pressure relief component located in the first pressure relief area when the first pressure relief area is opened along the first connection score, thereby further reducing the risk of the opening area being too small and causing poor air flow.

[0019] In some embodiments, the pressure relief component is further provided with a second connecting notch, one end of the second connecting notch being connected to the third end, and the other end of the second connecting notch being connected to the fourth end. The second connecting notch and the second pressure relief notch form a second pressure relief region, and the thickness of the pressure relief component at the second connecting notch is greater than the thickness of the pressure relief component at the second pressure relief notch. When the battery cell releases pressure, the second pressure relief notch will rupture before the second connecting notch, and the second pressure relief region can open along the second connecting notch, shortening the time it takes for the second pressure relief region to open, thereby achieving rapid pressure relief.

[0020] In some embodiments, at least one second reinforcement notch is provided within the second pressure relief region. The thickness of the pressure relief component at the second reinforcement notch is greater than the thickness of the pressure relief component at the second pressure relief notch. The second reinforcement notch is connected to the second pressure relief notch and / or the second connection notch. When the battery cell releases pressure, the second pressure relief notch will rupture before the second reinforcement notch. The second reinforcement notch can reduce the risk of wrinkling the portion of the pressure relief component located in the second pressure relief region after opening, resulting in an excessively small opening area in the second pressure relief region and poor air discharge.

[0021] In some embodiments, the ends of the second reinforcement score are connected to the second pressure relief score and the second connecting score, respectively. This design can further reduce the risk of wrinkling when the portion of the pressure relief component in the second pressure relief area is opened when the second pressure relief area is opened, thereby further reducing the risk of the opening area being too small and causing poor air discharge.

[0022] In some embodiments, the first connection notch and the second connection notch at least partially overlap. This design allows the first connection notch and the second connection notch to share a portion of the pressure relief area, providing more space for the first pressure relief area and the second pressure relief area, thereby increasing the possibility of forming a larger opening for gas to pass through.

[0023] In some embodiments, the first connecting notch and the second connecting notch are the same notch. This design further increases the possibility of forming a larger opening for gas to pass through.

[0024] In some embodiments, the first connecting notch includes a first main section, a first connecting section, and a second connecting section. One end of the first main section is connected to the first end of the first pressure relief notch via the first connecting section, and the other end of the first main section is connected to the second end of the first pressure relief notch via the second connecting section. The second connecting notch includes a second main section, a third connecting section, and a fourth connecting section. One end of the second main section is connected to the third end of the second pressure relief notch via the third connecting section, and the other end of the second main section is connected to the fourth end of the second pressure relief notch via the fourth connecting section. The first main section and the second main section overlap. This design allows for a certain spacing between the first and third ends, as well as between the second and fourth ends, thereby reducing the risk of partial pressure relief components located outside the first and second pressure relief areas opening substantially synchronously with the first and second pressure relief areas due to the small spacing between the first and third ends, as well as between the second and fourth ends, causing such partial pressure relief components to overlap with other components in the battery and cause a battery short circuit.

[0025] In some embodiments, the first connection notch and the second connection notch are spaced apart. This design reduces the possibility of the portion of the pressure relief component located in the first pressure relief area and the second pressure relief area detaching from the battery cell when the first pressure relief area is opened along the first connection notch and when the second connection notch is opened along the second connection notch, thereby reducing the risk of secondary damage to the battery interior.

[0026] In some embodiments, the first connecting notch and the second connecting notch are parallel to each other. This design reduces the risk that the portion of the pressure relief component located in the first pressure relief area will interfere with the portion of the pressure relief component located in the second pressure relief area when the pressure relief component is opened, resulting in an opening area formed by the first and second pressure relief areas being too small.

[0027] In some embodiments, the first pressure relief score and the second pressure relief score are symmetrically arranged about the longitudinal axis or the width axis of the pressure relief component. This design ensures that the first and second pressure relief scores are substantially equally difficult to rupture, allowing the first and second pressure relief scores to rupture promptly, thereby improving pressure relief efficiency.

[0028] In some embodiments, the first pressure relief notch includes a first straight line segment, a first arc segment, and a second arc segment, with the first straight line segment connecting the first and second arc segments at both ends. The second pressure relief notch includes a second straight line segment, a third arc segment, and a fourth arc segment, with the second straight line segment connecting the third and fourth arc segments at both ends. The provision of the first, second, third, and fourth arc segments facilitates enclosing a larger area, resulting in a larger opening when pressure is released from the battery cell, facilitating smooth pressure release.

[0029] In some embodiments, the pressure relief component has a first surface and a second surface disposed opposite each other along its thickness direction. The first surface is provided with a groove recessed toward the second surface. The first and second pressure relief notches are provided on the bottom wall of the groove, and both the first and second pressure relief notches extend circumferentially along the sidewalls of the groove. The first and second pressure relief notches are spaced apart circumferentially along the sidewalls of the groove, which facilitates a larger opening formed when the pressure relief component is opened, thereby ensuring smoother and more rapid exhaust.

[0030] In a second aspect, the present application provides a battery cell, which includes the pressure relief component in the above embodiment, and the pressure relief component is configured to release the internal pressure of the battery cell.

[0031] In some embodiments, the battery cell further comprises a housing having a wall portion. The pressure relief component is a wall portion. The housing has a wall portion, and the pressure relief component is a wall portion of the housing. That is, the pressure relief component is a wall of the housing. The pressure relief notch can be directly machined on the housing, simplifying the process and reducing costs.

[0032] In some embodiments, the battery cell further comprises a housing having a wall portion, wherein the wall portion has a pressure relief hole. A pressure relief component is mounted on the wall portion and covers the pressure relief hole. The pressure relief component and the housing are separate structures, and the pressure relief component is an independent component mounted on one wall of the housing. This structure, on the one hand, helps reduce the difficulty of assembling the pressure relief component and the housing, thereby improving the production efficiency of the battery cell. On the other hand, the pressure relief component can be pre-machined with a pressure relief notch before being assembled with the pressure relief hole, reducing the risk of excessive deformation of the housing caused by directly machining notches on the housing.

[0033] In some embodiments, the housing includes a shell and an end cap. The shell defines an opening within a cavity for accommodating the electrode assembly. The end cap seals the opening. The end cap is a wall. By configuring the wall of the shell as an end cap for sealing the opening of the shell, a battery cell employing this structure facilitates mounting a pressure relief portion on the end cap, thereby effectively reducing the difficulty of processing the battery cell and improving battery cell production efficiency.

[0034] In some embodiments, the housing includes a shell and an end cap. The housing defines an opening within the housing for accommodating the electrode assembly. The end cap seals the opening. The housing includes a wall portion. By configuring the wall portion of the housing as a wall of the housing, a battery cell employing this structure can reduce the impact of stress generated when the end cap and housing are connected to each other on the pressure relief notch, thereby reducing the risk of abnormal cracking in the pressure relief notch and improving the reliability of the battery cell.

[0035] In a third aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0036] In a fourth aspect, the present application provides an electrical device, which includes the battery cell in the above embodiment, and the battery cell is used to provide electrical energy. Or, it includes the battery in the above embodiment, and the battery is used to provide electrical energy.

[0037] 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, which can be implemented in accordance with the contents of the specification, and to make 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

[0038] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0039] FIG1 is a schematic structural diagram of a vehicle according to some embodiments of the present application;

[0040] FIG2 is an exploded view of a battery according to some embodiments of the present application;

[0041] FIG3 is an exploded view of a battery cell according to some embodiments of the present application;

[0042] FIG4 is a schematic structural diagram of a pressure relief component in some embodiments of the present application;

[0043] FIG5 is a schematic structural diagram of a pressure relief component in some other embodiments of the present application;

[0044] FIG6 is a schematic structural diagram of a pressure relief component in some further embodiments of the present application;

[0045] FIG7 is a schematic structural diagram of a pressure relief component according to some other embodiments of the present application, showing connection notches;

[0046] FIG8 is a schematic structural diagram of a pressure relief component in some other embodiments of the present application;

[0047] FIG9 is a cross-sectional view of the section AA in FIG8 of the present application;

[0048] FIG10 is a schematic structural diagram of a pressure relief component in some other embodiments of the present application;

[0049] FIG11 is a cross-sectional view at BB in FIG10 of the present application;

[0050] FIG12 is an isometric view of a pressure relief component according to some embodiments of the present application;

[0051] FIG13 is an axonometric view of a pressure relief component according to yet other embodiments of the present application;

[0052] FIG14 is a schematic structural diagram of a pressure relief component according to some embodiments of the present application, wherein a first connection notch and a second connection notch at least partially overlap;

[0053] FIG15 is a cross-sectional view of the CC portion of FIG14 of the present application;

[0054] FIG16 is a schematic structural diagram of a pressure relief component in some embodiments of the present application, wherein the first connection notch and the second connection notch are arranged at intervals;

[0055] FIG17 is a schematic structural diagram of a pressure relief component according to some embodiments of the present application, wherein the first connection notch and the second connection notch are the same notch;

[0056] FIG18 is a partial enlarged view of point D in FIG17 of the present application;

[0057] FIG19 is a partial enlarged view of point E in FIG14 of the present application;

[0058] FIG20 is a schematic structural diagram of a pressure relief component according to some embodiments of the present application, showing the outlines of a first pressure relief notch and a second pressure relief notch.

[0059] The reference numerals in the specific embodiment are as follows: 1000-vehicle; 200-controller; 300-motor; 100-battery; 11-housing; 111-first part; 112-second part; 12-battery cell; 121-housing; 1211-end cover; 1212-housing; 122-electrode assembly; 10-pressure relief component; 1001-first surface; 1002-second surface; 101-pressure relief notch; 1011-first pressure relief notch; 10111-first end; 10112-second end; 10113-first arc segment; 10114-first straight segment; 10115-second arc segment; 1012-second pressure relief notch; 10121-third end; 10122-fourth end; 10123-third arc segment; 10124-second straight segment; 10125-fourth arc segment Segment; 102-first area; 103-center of the pressure relief component; 104-connecting notch; 1041-first connecting notch; 10411-first main body segment; 10412-first connecting segment; 10413-second connecting segment; 1042-second connecting notch; 10421-second main body segment; 10422-third connecting segment; 10423-fourth connecting segment; 105-reinforcement notch; 1051-first reinforcement notch; 1052-second reinforcement notch; 106-groove; a-central axis of the pressure relief component in the length direction; b-central axis of the pressure relief component in the width direction. DETAILED DESCRIPTION

[0060] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0061] 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.

[0062] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0063] 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.

[0064] 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).

[0065] 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.

[0066] 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.

[0067] In this application, battery cells may include, but are not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries. The shape of a battery cell may include, but is not limited to, a cylinder, a flat body, a rectangular parallelepiped, or other shapes. Battery cells, depending on the packaging method, may include, but are not limited to, cylindrical battery cells, prismatic battery cells, and soft-pack battery cells.

[0068] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery mentioned in the embodiments of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the risk of liquid or other foreign matter affecting the charging or discharging of the battery cells.

[0069] The following description will mainly focus on rectangular parallelepiped battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0070] In a typical battery cell structure, the battery cell includes a housing component, an electrode assembly, and an electrolyte. The housing component can be an end cap or a shell, and the end cap closes an opening of the shell to define a receiving space for receiving the electrode assembly.

[0071] The electrode assembly is housed in the housing. It includes a positive electrode sheet, a negative electrode sheet, and a separator. Battery cells primarily operate 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 collector. The uncoated positive electrode collector protrudes from the coated positive electrode collector, serving as the positive electrode tab. For lithium-ion batteries, for example, the positive electrode collector can be made of aluminum, and the positive electrode 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 collector. The uncoated negative electrode collector protrudes from the coated negative electrode collector, serving as the negative electrode tab. The negative electrode collector can be made of copper, and the negative electrode active material can be carbon, silicon, or other materials. In order to pass high current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. In addition, the electrode assembly can be formed in a manner including but not limited to winding or lamination.

[0072] The tabs generally lead out the electrical energy of the electrode assembly by being electrically connected to the conductive member. In some cases, the conductive member is a transition piece connecting the tabs and the electrode terminals. In other cases, the conductive member is the electrode terminal.

[0073] Electrode terminals generally include positive and negative terminals. For rectangular battery cells, electrode terminals are typically located in the end caps. In some other cases, electrode terminals may also be located in the housing. Multiple battery cells can be connected in series and / or in parallel via the electrode terminals for various applications.

[0074] The development of battery technology must take into account multiple design factors at the same time, such as energy density, cycle life, discharge capacity, charge and discharge rate and other performance parameters. In addition, battery reliability must also be considered.

[0075] For battery cells, there are generally at least three layers of protection measures, specifically including at least switching elements, appropriate isolation membrane materials, and pressure relief components.

[0076] A pressure relief component refers to an element or component that is activated to release the internal pressure or temperature when the internal pressure or temperature or other conditions of a battery cell reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on the material of one or more of the positive electrode plate, negative electrode plate, electrolyte and separator in the battery cell. The pressure relief component can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature or other conditions of the battery cell reaches a predetermined threshold, the pressure relief component performs an action or the weak structure provided in the pressure relief component is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. Generally, the melting point and / or thickness of the weak structure is lower than that of other areas of the pressure relief component. For example, the weak structure can be a notched groove provided on the surface of the pressure relief component.

[0077] The "activation" mentioned in this application means that the pressure relief component produces an action or is activated to a certain state, so that the internal pressure and temperature of the battery cell can be released, so that the internal pressure and temperature of the battery cell can be released. The action produced by the pressure relief component may include but is not limited to: at least a part of the pressure relief component is broken, shattered, torn or opened, etc. The actuation of the pressure relief component can also be referred to as the opening of the pressure relief component. When the pressure relief component is actuated, the high-temperature and high-pressure substances inside the battery cell will be discharged outward from the actuated part as exhaust. In this way, the pressure and temperature of the battery cell can be relieved under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0078] The emissions from battery cells mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0079] The pressure relief component is typically located on the end cap. In the event of thermal runaway of a battery cell, high-temperature, high-pressure emissions are discharged in the direction of the pressure relief component, and more specifically, toward the area where the pressure relief component is actuated. The force and destructive power of these emissions can be significant, potentially even sufficient to breach one or more structures in that direction. In embodiments where the weak structure is a score groove, the score groove will rupture during thermal runaway, forming an opening through which the emissions can pass.

[0080] In some cases, in order to open the pressure relief component to form a larger opening area when the battery cell is in thermal runaway, the notched groove is generally set on the edge of the pressure relief component, and the notched groove extends along the circumference of the pressure relief component so that the notched groove encloses a larger range, forming a larger opening for the discharge to pass through. Inside the battery, in order to increase the energy density of the battery, the space between the side of the pressure relief component of the battery cell and other components in the battery (such as the bar in the busbar component, the high-voltage interface and connectors in the battery, etc.) is generally designed to be as small as possible. Such a notched groove is generally shallow on one side and deep on three sides. When the pressure relief component is opened, the pressure relief component will open along the shallow side of the notch. At this time, the size of the opened part of the pressure relief component is basically close to the size of the entire pressure relief component, which is easy to overlap with other components in the battery, causing a short circuit in the battery. The reliability of the battery is poor.

[0081] In other cases, the pressure relief component is divided into multiple pressure relief parts by notched grooves. The multiple pressure relief parts will flip from the center of the pressure relief component to the edge of the pressure relief component to form an opening. However, there is generally a certain height difference between the positions of the pressure relief components in the battery cells, and the middle size of the pressure relief component is generally larger. In the process of the multiple pressure relief parts flipping from the center to the edge of the pressure relief component, the edge of the longer pressure relief part located in the middle of the pressure relief component is in a flipped state, and there is a greater risk of interference with the remaining parts of the pressure relief component other than the pressure relief part, such as the hole wall, annular boss, etc. As a result, the opening area formed after the pressure relief component is opened is smaller, or it can be said that it is more difficult to fully open the pressure relief component, or it can be said that it is more difficult to fully open to form the predetermined opening area. If the above situation occurs, the ability of the pressure relief component to release pressure will be reduced, and the reliability of the battery will also be deteriorated.

[0082] In light of this, the present application provides a pressure relief component for use with a battery cell. The pressure relief component is provided with at least two pressure relief notches. Each pressure relief notch and a line connecting the two ends of the pressure relief notch form a first region. The multiple first regions are spaced apart, and a line connecting at least one of the first regions is located near the center of the pressure relief component. When the battery cell releases pressure, the pressure relief notches rupture, forming an opening in the pressure relief component for smooth gas flow. The pressure relief component is provided with at least two pressure relief notches. Each pressure relief notch and a line connecting the two ends of the pressure relief notch form a first region. The multiple first regions are spaced apart. This design allows the pressure relief component to form a larger opening when it is opened, while reducing the risk of overlapping portions of the pressure relief component with other components in the battery, causing a short circuit, and thus improving battery reliability. The line connecting at least one of the first regions is located near the center of the pressure relief component, reducing the risk of the portion of the pressure relief component within the first region being blocked by other parts of the battery cell casing when the pressure relief component is opened, resulting in an opening that is too small.

[0083] The technical solutions described in the embodiments of the present application are applicable to battery cells, batteries, and electrical equipment using batteries.

[0084] Electrical equipment includes, but is not limited to, battery vehicles, electric vehicles, ships, and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.

[0085] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0086] For example, FIG1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A motor 300, a controller 200, and a battery 100 may be provided inside the vehicle 1000. The controller 200 is used to control the battery 100 to power the motor 300. For example, the battery 100 may be provided at the bottom, front, or rear of the vehicle 1000. The battery 100 may be used to power the vehicle 1000. For example, the battery 100 may serve as the operating power source of the vehicle 1000 and may be used for the circuit system of the vehicle 1000, such as for the starting, navigation, and operation power requirements of the vehicle 1000. In another embodiment of the present application, the battery 100 may serve not only as the operating power source of the vehicle 1000, but also as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0087] To meet different power requirements, the battery 100 may include multiple battery cells 12, wherein the multiple battery cells 12 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to a mixture of series and parallel connections. The battery 100 may also be referred to as a battery pack. Optionally, multiple battery cells 12 may first be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules may then be connected in series, in parallel, or in a hybrid connection to form the battery 100. In other words, multiple battery cells 12 may directly form the battery 100, or they may first form battery modules, which may then form the battery 100.

[0088] For example, referring to FIG. 2 , FIG. 2 is an exploded view of a battery 100 according to some embodiments of the present application. The battery 100 may include a plurality of battery cells 12. The battery 100 may also include a housing 11 having a hollow interior, and the plurality of battery cells 12 are housed within the housing 11. As shown in FIG. 2 , these are referred to herein as a first portion 111 and a second portion 112, respectively. The first portion 111 and the second portion 112 are fastened together. The shapes of the first portion 111 and the second portion 112 may be determined based on the combined shape of the plurality of battery cells 12. The first portion 111 and the second portion 112 may each have a single opening. For example, the first portion 111 and the second portion 112 may each be a hollow rectangular parallelepiped, each with only one open face. The opening of the first portion 111 and the opening of the second portion 112 are arranged opposite each other, and the first portion 111 and the second portion 112 are fastened together to form the housing 11 having a closed chamber. The plurality of battery cells 12 are then arranged in parallel, in series, or in a mixed configuration and then placed within the housing 11 formed by the fastening of the first portion 111 and the second portion 112.

[0089] Optionally, the battery 100 may also include other structures, which will not be described in detail here. For example, the battery may also include a busbar component, which is used to realize electrical connection between multiple battery cells 12, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 12 by connecting the electrode terminals of the battery cells 12. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 12 by welding. The busbar component may include a bar, and the electrode terminals of the battery cells 12 are welded to the bar, and the electrical energy of the multiple battery cells 12 can be further led out through the box body 11 through a conductive mechanism.

[0090] The number of battery cells 12 can be set to any value according to different power requirements. Multiple battery cells 12 can be connected in series, parallel, or in a hybrid manner to achieve a larger capacity or power. Since the number of battery cells 12 included in each battery 100 may be large, for ease of installation, the battery cells 12 can be grouped, and each group of battery cells 12 constitutes a battery module. The number of battery cells 12 included in a battery module is not limited and can be set according to requirements. The battery 100 may include multiple battery modules, which can be connected in series, parallel, or in a hybrid manner.

[0091] Please refer to Figure 3, which is an exploded view of a battery cell 12 in some embodiments of the present application. The battery cell 12 includes one or more electrode assemblies 122 and a shell 121. The shell 121 may include a housing 1212. The multiple walls of the housing 1212, i.e., the multiple walls of the housing 121, form a cavity, which can be used to accommodate the electrode assembly 122. The housing 1212 is determined according to the shape of the one or more electrode assemblies 122 after being combined. For example, the housing 1212 can be a hollow cuboid, a cube, or a regular polyhedron, and one of the faces of the housing 1212 has an opening so that one or more electrode assemblies 122 can be placed in the housing 1212. The housing 1212 is filled with an electrolyte, such as an electrolyte solution.

[0092] The battery cell 12 may also include two electrode terminals, which may be provided on the end cover 1211. The end cover 1211 is generally in the shape of a flat plate, and the two electrode terminals are fixed on the flat surface of the end cover 1211. The two electrode terminals are respectively a positive electrode terminal and a negative electrode terminal. A corresponding adapter is provided for each electrode terminal, which is located between the end cover 1211 and the electrode assembly 122 and is used to electrically connect the electrode assembly 122 and the electrode terminal. In the battery cell 12, according to actual use requirements, the electrode assembly 122 may be provided as a single or multiple electrode assemblies, and a plurality of independent electrode assemblies 122 are provided in the battery cell 12. The battery cell 12 may also include a pressure relief component 10, which may be the wall of the shell 1212 or a part thereof, or the end cover 1211 itself or a part thereof.

[0093] According to some embodiments of the present application, please refer to Figures 4 to 6. The present application provides a pressure relief component 10 for a battery cell 12. The pressure relief component 10 is provided with at least two pressure relief notches 101. Each pressure relief notch 101 and the connecting line at both ends of the pressure relief notch 101 form a first area 102. The multiple first areas 102 are arranged at intervals, and the connecting line of at least one first area 102 is located on the side of the first area 102 close to the center 103 of the pressure relief component.

[0094] When the pressure relief component 10 is opened, it means that the pressure inside the battery cell 12 reaches a preset pressure or temperature or other predetermined threshold value and the internal pressure or temperature needs to be released.

[0095] The shape of the pressure relief component 10 may include, but is not limited to, circular, elliptical, polygonal, waist-shaped, etc. The shape of the pressure relief component 10 may be a shape with a certain degree of symmetry or an asymmetric shape.

[0096] The center 103 of the pressure relief component can be the geometric center of the pressure relief component 10. The geometric center is the centralmost position of an object with a certain degree of symmetry, such as the center of a circle, the center of a sphere, or the intersection of two diagonals of a parallelogram. It can also be the center of gravity of the pressure relief component 10, or the intersection of a line passing through the center of gravity of the pressure relief component 10 and the pressure relief component 10 in the thickness direction of the pressure relief component 10. The center of gravity can be determined using methods such as a hanging valve, a support method, a needle top method, or a plumb line.

[0097] The pressure relief score 101 may refer to a portion of the pressure relief component 10 having a thickness and / or melting point lower than the thickness of other areas of the pressure relief component 10 except the pressure relief score 101, such as a score groove or a pressure relief groove, that is, a groove 106 is opened on the surface of the pressure relief component 10, which is equivalent to thinning the thickness of the pressure relief component 10 at the position where the pressure relief score 101 is set.

[0098] The pressure relief notch 101 can be formed by machining, etching, stamping, or the like.

[0099] The line connecting the two ends of the pressure relief notch 101 is a virtual line and does not represent a physical groove, etc. It can be understood as a reference line. Each pressure relief notch 101 and the line connecting the two ends of the pressure relief notch 101 form a first area 102, which means that the shape of the pressure relief notch 101 is a non-linear notch.

[0100] On the premise that the opening area formed by the pressure relief component 10 is basically the same, compared with the battery cell 12 in which the pressure relief component 10 includes a notch groove with one shallow side and three deep sides, the pressure relief component 10 is provided with at least two pressure relief notches 101. Each pressure relief notch 101 and the line connecting the two ends of the pressure relief notch 101 form a first area 102. The multiple first areas 102 are arranged at intervals, which means that when the pressure relief component 10 is opened, the height of the opened part of the pressure relief component 10, such as the folded part, beyond the surface of the pressure relief component 10 (or the valve opening height) is smaller, thereby reducing the risk of the pressure relief component 10 overlapping with the bar or high-pressure interface and connectors. Taking the pressure relief component 10 as an elongated sheet as an example, the above-mentioned valve opening height is set to be less than the maximum length or maximum width of the pressure relief component 10.

[0101] When the pressure relief component 10 is opened, a portion of the pressure relief component 10 may be opened with the pressure relief notch 101 as the boundary. The opened portion may be referred to as the pressure relief portion. The pressure relief portion may be opened by tilting the edge near the pressure relief notch 101 and extending beyond the surface of the pressure relief component 10 where the pressure relief notch 101 is located, or by folding over with the end of the pressure relief notch 101 as the base point.

[0102] The shape of the pressure relief notch 101 may be an arc, a broken line, etc. The pressure relief notch 101 may include multiple segments, for example, at least one arc segment and at least one straight line segment.

[0103] At least two pressure relief notches 101 can be spaced apart along a certain direction. For example, if the pressure relief component 10 is a long, sheet-like member, multiple pressure relief notches 101 can be distributed on both sides of its longitudinal axis. These multiple pressure relief notches 101 are spaced apart along its longitudinal direction, and the pressure relief notches 101 on the same side of its longitudinal axis are bent away from its center point. In other embodiments, the multiple pressure relief notches 101 on both sides of its longitudinal axis correspond to each other and are mirror-symmetrical about its longitudinal axis.

[0104] The connecting line of at least one first area 102 is located on the side of the first area 102 close to the center 103 of the pressure relief component, which means that when the pressure relief component 10 is opened, the pressure relief portion will "open from the edge to the center". Taking the case where the pressure relief portion will fold over and exceed the outer surface of the pressure relief component 10 as an example, the pressure relief portion will fold over from the edge to the center of the pressure relief component 10. For example, please refer to Figure 4. When the pressure relief component 10 is opened, the upper and lower pressure relief notches 101 will split and fold over with the connecting line of its two end points as the reference baseline, forming a "V" shape after folding.

[0105] 4 to 6 , in the embodiment where the pressure relief component 10 includes a plurality of first regions 102 , the areas of the first regions 102 may be the same or different.

[0106] In some embodiments, the pressure relief component 10 is disposed on or is the wall of the battery cell 12 . Generally, the pressure relief component 10 has a certain conductivity and its material may include aluminum or steel.

[0107] In some cases, the pressure relief notch 101 of the pressure relief component 10 may include four sides, extending along the circumference of the component 10. One side has a shallow notch, while the other three sides have deep notches. When the pressure relief component 10 is opened, the deeper notch ruptures first. Under the impact of significant heat, the notch folds around the shallower notch. After folding, the height of the pressure relief portion extending beyond the surface of the pressure relief component 10 is substantially equal to the maximum length or width of the pressure relief portion 10, resulting in a higher risk of overlap with the tab. In other cases, the pressure relief component 10 is positioned within the wall of the battery cell 12, and the center portion of the pressure relief component 10 is generally larger. The pressure relief component 10 is positioned within and covers a pressure relief hole defined in the wall of the battery cell 12. When the pressure relief portion folds from the center toward the edges, the longer edges of the pressure relief portion are prone to interfering with the hole wall and becoming stuck, making it more difficult to form an opening of the predetermined area. When the pressure relief part contacts the hole wall, wrinkles may occur. The wrinkled pressure relief part will also block part of the preset opening, making the pressure relief area smaller than the preset area and resulting in poor exhaust.

[0108] In the technical solution of the embodiment of the present application, when the battery cell 12 releases pressure, the pressure relief notch 101 ruptures, causing the pressure relief component 10 to form an opening for gas to pass smoothly. The pressure relief component 10 is provided with at least two pressure relief notches 101. Each pressure relief notch 101 and the line connecting the two ends of the pressure relief notch 101 form a first area 102, and multiple first areas 102 are arranged at intervals. This design can form a larger opening when the pressure relief component 10 is opened, while reducing the risk of overlapping of part of the pressure relief component 10 with other components in the battery 100, causing a short circuit in the battery 100, thereby improving the reliability of the battery 100. The line connecting at least one first area 102 is located on the side of the first area 102 close to the center 103 of the pressure relief component, which can reduce the risk of the portion of the pressure relief component 10 located within the first area 102 being blocked by other parts of the battery cell 12 shell 121 when the pressure relief component 10 is opened, resulting in the formation of an opening area that is too small.

[0109] According to some embodiments of the present application, referring to FIG. 4 to FIG. 6 , a plurality of first regions 102 are spaced apart around the center 103 of the pressure relief component, and each pressure relief notch 101 is bent away from the center of the pressure relief component 10 .

[0110] Bending can be understood as curvature, arching, bulging, etc.

[0111] Multiple first regions 102 are spaced apart around the center 103 of the pressure relief component, including multiple first regions 102 spaced apart along the circumference of the pressure relief component 10. The angle between two adjacent first regions 102 can be the same or different. The two first regions 102 in Figures 4 and 5 can be understood as two first regions 102 spaced 180 degrees apart around the center 103 of the pressure relief component, and the three first regions 102 in Figure 6 can be understood as three first regions 102 spaced 120 degrees apart around the center 103 of the pressure relief component.

[0112] Multiple first regions 102 are spaced around the center 103 of the pressure relief component, and each pressure relief notch 101 is bent away from the center of the pressure relief component 10. This means that the multiple pressure relief portions of the pressure relief component 10 open from the edge toward the center. Even if the pressure relief portions are folded, the risk of adjacent pressure relief portions contacting or abutting each other during the folding process is low.

[0113] Multiple first regions 102 are spaced apart around the center 103 of the pressure relief component, and each pressure relief notch 101 curves away from the center of the pressure relief component 10. This design reduces the risk of the portion of the pressure relief component 10 located within the first region 102 being blocked by the portion within the adjacent first region 102 when the pressure relief component 10 is opened, resulting in an excessively small opening area.

[0114] According to some embodiments of the present application, referring to FIG. 8 and FIG. 9 , the thickness of the pressure relief component 10 at the pressure relief notch 101 is T1, satisfying: T1 ≥ 0.03 mm.

[0115] The thickness of the pressure relief component 10 at the pressure relief notch 101 can be any value greater than or equal to 0.03 mm and less than the thickness of the pressure relief component 10 itself, for example, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, etc. When the pressure relief component 10 is a structural member of non-uniform thickness, its thickness refers to its average thickness.

[0116] Taking the example of opening a notch groove on the surface of the pressure relief component 10, the thickness of the pressure relief component 10 at the pressure relief notch 101 refers to the thickness remaining at the position where the notch groove is set in the pressure relief component 10 after the notch groove is opened, which can also be called the residual thickness.

[0117] Setting the thickness of the pressure relief component 10 at the pressure relief notch 101 within a reasonable range can make the pressure relief notch 101 more likely to rupture when the battery cell 12 is depressurized, thereby allowing the battery cell 12 to release pressure smoothly.

[0118] According to some embodiments of the present application, referring to Figures 7, 10 and 11, the pressure relief component 10 is provided with at least two connecting notches 104, the connecting notches 104 correspond one-to-one to the pressure relief notches 101, and the two ends of each pressure relief notch 101 are connected by the connecting notch 104. The thickness of the pressure relief component 10 at the connecting notch 104 is greater than the thickness of the pressure relief component 10 at the pressure relief notch 101.

[0119] The thickness of the pressure relief component 10 at the connection notch 104 is greater than that at the pressure relief notch 101, meaning that when the pressure relief component 10 is opened, the pressure relief notch 101 will crack before the connection notch 104. Since the location of the pressure relief component 10 where the connection notch 104 is located is relatively weak, taking the connection notch 104 as an example, the space in the notch groove will allow some space for the pressure relief component 10 to flip over. After the pressure relief notch 101 cracks, the impact force generated by the thermal runaway of the battery cell 12 will drive some of the pressure relief component 10 to flip over around the connection notch 104. It can be understood that the connection notch 104 is, to a certain extent, similar to the creases pre-formed on paper when origami is used.

[0120] Taking the embodiment in which the pressure relief score 101 and the connecting score 104 are integrally formed by stamping as an example, since the pressure relief score 101 needs to be stamped, if the pressure relief component 10 does not have the connecting score 104, when the recessed pressure relief score 101 is stamped, some material will be squeezed toward the center 103 of the pressure relief component, and the risk of bulging of the center 103 of the pressure relief component is higher. However, by simultaneously processing the pressure relief score 101 and the connecting score 104, the internal stress of the pressure relief component 10 is balanced while the recessed pressure relief score 101 is stamped. This ensures that the material distribution of the pressure relief component 10 after the pressure relief score 101 and the connecting score 104 are formed is more uniform, reducing the risk of partial bulging of the pressure relief component 10.

[0121] In some embodiments, referring to FIG. 7 , the pressure relief component 10 includes three pressure relief notches 101 spaced apart along the edge of the pressure relief component 10 . The pressure relief component 10 also includes three connecting notches 104 . The connecting notches 104 correspond to the pressure relief notches 101 one-to-one. The two ends of each pressure relief notch 101 are connected by the corresponding connecting notch 104 . When the battery cell 12 releases pressure, the pressure relief notch 101 ruptures before the connecting notch 104 . In some cases, the three pressure relief notches 101 fold around the corresponding connecting notch 104 . The pressure relief notch 101 may include three segments: two straight segments and one arc segment. The arc segment protrudes away from the center 103 of the pressure relief component. The two straight segments are located at either end of the arc segment, with one end of the straight segment connected to the arc segment and the other end of the straight segment connected to the connecting notch 104 . 6 , the opening formed by the pressure relief component 10 in the embodiment shown in FIG7 is larger in area when opened, which is beneficial to improving exhaust efficiency. Optionally, the pressure relief component 10 is circular in shape, and the center 103 of the pressure relief component is the center of the circle of the pressure relief component 10.

[0122] When the battery cell 12 releases pressure, the pressure relief notch 101 will crack before the connection notch 104. Part of the pressure relief component 10 can be opened along the connection notch 104 or flipped around the connection notch 104, shortening the time to form an opening of a predetermined area and achieving rapid pressure relief.

[0123] According to some embodiments of the present application, referring to FIG. 10 and FIG. 11 , the thickness of the pressure relief component 10 at the connection notch 104 is T2, satisfying: T2 ≥ 0.04 mm.

[0124] The thickness of the pressure relief component 10 at the connection notch 104 can be any value greater than or equal to 0.04 mm and less than the thickness of the pressure relief component 10 itself, for example, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, etc. When the pressure relief component 10 is a structural member of non-uniform thickness, its thickness refers to its average thickness.

[0125] The thickness of the pressure relief component 10 at the connection notch 104 is also referred to as the aforementioned residual thickness.

[0126] By setting the thickness of the pressure relief component 10 at the pressure relief notch 101 within a reasonable range, when the battery cell 12 is depressurized, while the connection notch 104 is cracked later than the pressure relief notch 101, part of the pressure relief component 10 is more likely to open along the connection notch 104, thereby shortening the time to form an opening of a predetermined area and achieving rapid pressure relief.

[0127] According to some embodiments of the present application, referring to FIG. 10 and FIG. 11 , the first region 102 is provided with a reinforcement notch 105 , and the thickness of the pressure relief component 10 at the reinforcement notch 105 is greater than the thickness of the pressure relief component 10 at the pressure relief notch 101 .

[0128] The thickness of the pressure relief component 10 at the reinforcement score 105 is greater than the thickness of the pressure relief component 10 at the pressure relief score 101, which means that when the pressure relief component 10 is opened, the reinforcement score 105 will crack before the connecting score 104, and because the strength of the position where the reinforcement score 105 is set on the pressure relief component 10 is higher than the strength of the position where the connecting score 104 is set on the pressure relief component 10, to a certain extent, the reinforcement score 105 can reduce the risk of wrinkling of part of the pressure relief component 10 after folding.

[0129] The pressure relief component 10 has a connecting score 104 and / or a reinforcing score 105 .

[0130] The reinforcement score 105 may be one segment or multiple segments.

[0131] In embodiments where the reinforcement score 105 is a segment, the segment can be a straight line segment or an arc segment. In other embodiments, the reinforcement score 105 is an arc segment, with both ends of the arc segment connected to the pressure relief score 101, and at least a portion of the middle of the arc segment overlaps with the connection score 104.

[0132] Taking the embodiment in which pressure relief component 10 is provided with both reinforcement score 105 and connecting score 104 as an example, in embodiments where reinforcement score 105 is a single segment, reinforcement score 105 can be connected to pressure relief score 101 and / or connecting score 104. In embodiments where reinforcement score 105 is multi-segmented, reinforcement score 105 can be arranged arbitrarily within first region 102. In other embodiments, reinforcement score 105 can intersect with connecting score 104. In this arrangement, reinforcement score 105 can further significantly reduce the risk of partial bulging of pressure relief component 10.

[0133] When the battery cell 12 is depressurized, the pressure relief notch 101 will rupture before the reinforcement notch 105 . The reinforcement notch 105 can reduce the risk of wrinkling of the opened portion of the pressure relief component 10 , resulting in an opening area that is too small and poor exhaust.

[0134] According to some embodiments of the present application, referring to FIG. 10 and FIG. 11 , the thickness of the pressure relief component 10 at the reinforcement notch 105 is T3, satisfying: T3 ≥ 0.04 mm.

[0135] The thickness of the pressure relief component 10 at the reinforcement score 105 can be any value greater than or equal to 0.04 mm and less than the thickness of the pressure relief component 10 itself, for example, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, etc. When the pressure relief component 10 is a structural member of non-uniform thickness, its thickness refers to its average thickness.

[0136] By setting the thickness of the pressure relief component 10 at the pressure relief notch 101 within a reasonable range, when the battery cell 12 releases pressure, while the reinforcement notch 105 cracks later than the pressure relief notch 101, the strength of the pressure relief component 10 at the reinforcement notch 105 is higher than that of the pressure relief component 10 at the pressure relief notch 101, thereby reducing the risk of wrinkling of the opened portion of the pressure relief component 10, resulting in an opening area that is too small and poor exhaust.

[0137] According to some embodiments of the present application, please refer to Figures 3 and 12-15. The pressure relief component 10 has a first surface 1001 and a second surface 1002 arranged opposite to each other along its thickness direction. The first surface 1001 is provided with a groove 106 recessed toward the second surface 1002. The pressure relief notch 101 is provided on the bottom wall of the groove 106. A plurality of pressure relief notches 101 are arranged at circumferential intervals along the side wall of the groove 106.

[0138] In some embodiments, the wall of the battery cell 12 has a pressure relief hole that extends along and through the wall of the battery cell 12. The pressure relief component 10 covers the pressure relief hole. The wall of the pressure relief hole and the pressure relief component 10 form a groove 106, and the pressure relief component 10 serves as the bottom wall of the groove 106. In other embodiments, the wall of the battery cell 12 is provided with an outwardly protruding annular boss. The inner wall of the annular boss and the wall of the battery cell 12 form a groove 106, and the wall of the battery cell 12 serves as the bottom wall of the groove 106.

[0139] The plurality of pressure relief notches 101 are spaced apart along the circumference of the sidewall of the groove 106 , which means that the pressure relief notches 101 can enclose a larger area as much as possible, forming a larger opening for exhaust, such as hot gas, to pass through.

[0140] When the battery cell 12 releases pressure, the plurality of pressure relief notches 101 are spaced apart circumferentially along the sidewall of the groove 106 , which is beneficial for the opening formed when the pressure relief component 10 is opened to have a larger area, making the exhaust smoother and faster.

[0141] According to some embodiments of the present application, please refer to Figures 16 to 19, at least two pressure relief notches 101 include a first pressure relief notch 1011 and a second pressure relief notch 1012, the first pressure relief notch 1011 and the second pressure relief notch 1012 are both bent in a direction away from the center of the pressure relief component 10, the first pressure relief notch 1011 has a first end 10111 and a second end 10112, the second pressure relief notch 1012 has a third end 10121 close to the first end 10111 and a fourth end 10122 close to the second end 10112, the first end 10111 and the third end 10121 are spaced apart, and the second end 10112 and the fourth end 10122 are spaced apart.

[0142] In some embodiments, the first pressure relief notch 1011 and the second pressure relief notch 1012 can be understood as two segments of an annular notch with two discontinuities. Due to the presence of the discontinuities, the valve opening height after the first pressure relief notch 1011 and the second pressure relief notch 1012 are flipped is smaller, reducing the risk of overlap between the pressure relief component 10 and the flap, high-pressure interface, and connectors. In other embodiments, the reference line formed by the line connecting the discontinuities can be the longitudinal center axis a of the pressure relief component or the width center axis b of the pressure relief component.

[0143] When the battery cell 12 releases pressure, both the first pressure relief notch 1011 and the second pressure relief notch 1012 bend away from the center of the pressure relief component 10, reducing the risk of the pressure relief portion defined by the first and second pressure relief notches 1011, 1012 in the pressure relief component 10 being blocked by other portions of the housing 121, resulting in an excessively small opening area. The first pressure relief notch 1011 has a first end 10111 and a second end 10112. The second pressure relief notch 1012 has a third end 10121 proximate to the first end 10111 and a fourth end 10122 proximate to the second end 10112. The first end 10111 is spaced apart from the third end 10121, while the second end 10112 is spaced apart from the fourth end 10122. Such a design can reduce the risk of the pressure relief portion defined by the first pressure relief notch 1011 and the second pressure relief notch 1012 overlapping with other components in the battery 100 after opening, thereby improving the reliability of the battery 100.

[0144] According to some embodiments of the present application, please refer to Figures 16 to 19, the pressure relief component 10 is further provided with a first connecting notch 1041, one end of the first connecting notch 1041 is connected to the first end 10111, and the other end of the first connecting notch 1041 is connected to the second end 10112. The first connecting notch 1041 and the first pressure relief notch 1011 form a first pressure relief area, and the thickness of the pressure relief component 10 at the first connecting notch 1041 is greater than the thickness of the pressure relief component 10 at the first pressure relief notch 1011.

[0145] The thickness of the pressure relief component 10 at the first connection notch 1041 is greater than the thickness of the pressure relief component 10 at the first pressure relief notch 1011, which means that when the pressure relief component 10 is opened, the first pressure relief notch 1011 will open before the first connection notch 1041. Similarly, the first connection notch 1041 can also be similar to a fold to make the first pressure relief area easier to open.

[0146] The first connecting notch 1041 may be a single notch or a multi-segment notch. In the embodiment where the first connecting notch 1041 is a multi-segment notch, the first connecting notch 1041 may include at least one straight line segment and at least one arc segment.

[0147] When the battery cell 12 is in thermal runaway, there is a possibility that most of the first pressure relief area will open with the first pressure relief notch 1011 as the boundary and flip with the first connection notch 1041 as the axis.

[0148] When the battery cell 12 releases pressure, the first pressure relief notch 1011 will rupture before the first connection notch 1041 , and the first pressure relief area can open along the first connection notch 1041 , shortening the time for the first pressure relief area to form an opening and achieving rapid pressure relief.

[0149] Please refer to Figure 18. When the first pressure relief notch 1011 and the second pressure relief notch 1012 are regarded as two notches formed by the interruption of the annular notch, the first connecting notch 1041 can cross the annular notch. Since the thickness of the pressure relief component 10 at the first connecting notch 1041 is greater than the thickness of the pressure relief component 10 at the first pressure relief notch 1011, the first connecting notch 1041 actually interrupts the annular notch and forms two interruption points.

[0150] Similarly, the first connection notch 1041 can also reduce the risk of bulging of the pressure relief component 10 .

[0151] In some embodiments, the pressure relief component 10 is further provided with a first connecting notch 1041. One end of the first connecting notch 1041 is connected to the first end 10111, and the other end of the first connecting notch 1041 is connected to the second end 10112. The first connecting notch 1041 and the first pressure relief notch 1011 form a first pressure relief area. The thickness of the pressure relief component 10 at the first connecting notch 1041 is greater than the thickness of the pressure relief component 10 at the first pressure relief notch 1011. No connecting notch 104 is provided between the third end 10121 and the fourth end 10122.

[0152] According to some embodiments of the present application, please refer to Figures 16 to 19, at least one first reinforcement score 1051 is provided in the first pressure relief area, the thickness of the pressure relief component 10 at the first reinforcement score 1051 is greater than the thickness of the pressure relief component 10 at the first pressure relief score 1011, and the first reinforcement score 1051 is connected to the first pressure relief score 1011 and / or the first connection score 1041.

[0153] The thickness of the pressure relief component 10 at the first reinforcement score 1051 is greater than the thickness of the pressure relief component 10 at the first pressure relief score 1011, which means that when the pressure relief component 10 is opened, the first pressure relief score 1011 will open before the first reinforcement score 1051. Similarly, the first reinforcement score 1051 can also reduce the risk of the pressure relief component 10 bulging.

[0154] The first reinforcement score 1051 may intersect or be parallel to the first connection score 1041 .

[0155] When the battery cell 12 releases pressure, the first pressure relief notch 1011 will crack before the first reinforcement notch 1051. The first reinforcement notch 1051 can reduce the risk of the opening area of ​​the first pressure relief area being too small due to wrinkling after the part of the pressure relief component 10 located in the first pressure relief area is opened, resulting in poor exhaust.

[0156] According to some embodiments of the present application, referring to Figures 16 to 19 , the two ends of first reinforcement notch 1051 are respectively connected to first pressure relief notch 1011 and first connection notch 1041. This design can further reduce the risk of wrinkling when the portion of pressure relief component 10 in the first pressure relief area is opened along first connection notch 1041, thereby further reducing the risk of the opening area being too small and causing poor air flow.

[0157] According to some embodiments of the present application, please refer to Figures 16 to 19, the pressure relief component 10 is further provided with a second connecting notch 1042, one end of the second connecting notch 1042 is connected to the third end 10121, and the other end of the second connecting notch 1042 is connected to the fourth end 10122, the second connecting notch 1042 and the second pressure relief notch 1012 form a second pressure relief area, and the thickness of the pressure relief component 10 at the second connecting notch 1042 is greater than the thickness of the pressure relief component 10 at the second pressure relief notch 1012.

[0158] The area of ​​the second pressure relief region may be the same as or different from the area of ​​the first pressure relief region.

[0159] The thickness of the pressure relief component 10 at the second connection score 1042 is greater than the thickness of the pressure relief component 10 at the second pressure relief score 1012, which means that when the pressure relief component 10 is opened, the second pressure relief score 1012 will open before the second connection score 1042. Similarly, the second connection score 1042 can also be similar to a fold to make the second pressure relief area easier to open.

[0160] The second connecting notch 1042 may be a two-segment notch or a multi-segment notch. In the embodiment where the second connecting notch 1042 is a multi-segment notch, the second connecting notch 1042 may include at least two straight line segments and at least two arc segments.

[0161] When the battery cell 12 is in thermal runaway, there is a possibility that most of the second pressure relief area will open with the second pressure relief notch 1012 as the boundary and flip with the second connection notch 1042 as the axis.

[0162] In some embodiments, a first reinforcement notch 1051 is provided in the first pressure relief region, and no reinforcement notch 105 is provided in the second pressure relief region.

[0163] When the battery cell 12 releases pressure, the second pressure relief notch 1012 will rupture before the second connection notch 1042 , and the second pressure relief area can open along the second connection notch 1042 , shortening the time for the second pressure relief area to form an opening and achieving rapid pressure relief.

[0164] According to some embodiments of the present application, please refer to Figures 16 to 19, at least one second reinforcement score 1052 is provided in the second pressure relief area, the thickness of the pressure relief component 10 at the second reinforcement score 1052 is greater than the thickness of the pressure relief component 10 at the second pressure relief score 1012, and the second reinforcement score 1052 is connected to the second pressure relief score 1012 and / or the second connection score 1042.

[0165] The thickness of the pressure relief component 10 at the second reinforcement score 1052 is greater than the thickness of the pressure relief component 10 at the second pressure relief score 1012, which means that when the pressure relief component 10 is opened, the second pressure relief score 1012 will open before the second reinforcement score 1052. Similarly, the second reinforcement score 1052 can also reduce the risk of bulging of the pressure relief component 10.

[0166] The second reinforcement score 1052 may intersect or be parallel to the second connection score 1042 .

[0167] The first reinforcement notch 1051 may be connected to the second reinforcement notch 1052 or may be staggered.

[0168] When the battery cell 12 is depressurized, the second pressure relief notch 1012 will crack before the second reinforcement notch 1052. The second reinforcement notch 1052 can reduce the risk of the opening area of ​​the second pressure relief area being too small due to wrinkling after the part of the pressure relief component 10 located in the second pressure relief area is opened, resulting in poor exhaust.

[0169] According to some embodiments of the present application, referring to Figures 16 to 19 , the two ends of the second reinforcement notch 1052 are respectively connected to the second pressure relief notch 1012 and the second connecting notch 1042. This design can further reduce the risk of wrinkling when the portion of the pressure relief component 10 in the second pressure relief area is opened along the second connecting notch 1042, thereby further reducing the risk of the opening area being too small and causing poor air flow.

[0170] According to some embodiments of the present application, referring to FIG. 16 to FIG. 19 , the first connection notch 1041 and the second connection notch 1042 at least partially overlap.

[0171] 18 and 19 , the first connection notch 1041 and the second connection notch 1042 at least partially overlap.

[0172] For example, if connecting notches 104 are notched grooves, first connecting notch 1041 and second connecting notch 1042 at least partially overlap, this means that portions of the first connecting notch 1041 and second connecting notch 1042 form a single groove segment. Assuming the groove segment width is constant, when portions of the first connecting notch 1041 and second connecting notch 1042 form a single groove segment, compared to an embodiment in which first connecting notch 1041 and second connecting notch 1042 are spaced apart, pressure relief component 10 has a larger area available for forming an opening.

[0173] The first connection notch 1041 and the second connection notch 1042 at least partially overlap. This design allows the first connection notch 1041 and the second connection notch 1042 to share a portion of the pressure relief area, providing more space for the first and second pressure relief areas, thereby increasing the possibility of forming a larger opening for gas to pass through.

[0174] According to some embodiments of the present application, referring to FIG18 , the first connection notch 1041 and the second connection notch 1042 are the same notch. This design further increases the possibility of forming a larger opening for gas to pass through.

[0175] According to an embodiment of the present application, referring to Figures 14 and 19, the first connecting notch 1041 includes a first main body segment 10411, a first connecting segment 10412, and a second connecting segment 10413. One end of the first main body segment 10411 is connected to the first end 10111 of the first pressure relief notch 1011 through the first connecting segment 10412, and the other end of the first main body segment 10411 is connected to the second end 10112 of the first pressure relief notch 1011 through the second connecting segment 10413. The second connecting score 1042 includes a second main section 10421, a third connecting section 10422 and a fourth connecting section 10423. One end of the second main section 10421 is connected to the third end 10121 of the second pressure relief score 1012 through the third connecting section 10422. The other end of the second main section 10421 is connected to the fourth end 10122 of the second pressure relief score 1012 through the fourth connecting section 10423. The first main section 10411 overlaps with the second main section 10421.

[0176] The first connecting segment 10412, the second connecting segment 10413, the third connecting segment 10422, the fourth connecting segment 10423, the first main segment 10411, and the second main segment 10421 can each be one or multiple segments. In embodiments where multiple segments are used, they can include at least one straight segment and at least one arc segment. Referring to FIG. 19 , the second connecting segment 10413 and the fourth connecting segment 10423 each include multiple straight segments, forming a substantially L-shaped slot.

[0177] Such a design ensures a certain spacing distance between the first end 10111 and the third end 10121, as well as between the second end 10112 and the fourth end 10122, thereby reducing the risk of the partial pressure relief component 10 located outside the first pressure relief area and the second pressure relief area being opened substantially synchronously with the first pressure relief area and the second pressure relief area due to the small spacing distance between the first end 10111 and the third end 10121, as well as between the second end 10112 and the fourth end 10122, resulting in the risk of the partial pressure relief component 10 overlapping with other components in the battery 100 and causing a short circuit in the battery 100.

[0178] According to some embodiments of the present application, referring to FIG. 16 , the first connection notch 1041 and the second connection notch 1042 are spaced apart.

[0179] Opening along the score may refer to, in some embodiments, flipping the pressure relief zone with the score as the axis. Opening with the score as the boundary may refer to splitting the pressure relief zone at a position with the score as the boundary.

[0180] The spacing between the first connection notch 1041 and the second connection notch 1042 does not mean that the extension directions of the first connection notch 1041 and the second connection notch 1042 can only be parallel. The extension directions of the first connection notch 1041 and the second connection notch 1042 can intersect, that is, it can be understood that their respective extension lines intersect, but the physical parts do not intersect.

[0181] In some cases, if the pressure relief component 10 in the first and second pressure relief areas is separated from the wall of the battery cell 12, there is a high risk of impacting other components in the battery 100 under a certain impact force. The first connection notch 1041 and the second connection notch 1042 are spaced apart, which means that the pressure relief component 10 is more difficult to separate from the battery cell 12, thereby reducing this risk.

[0182] The first connection notch 1041 and the second connection notch 1042 are spaced apart. This design reduces the possibility of the portion of the pressure relief component 10 located in the first and second pressure relief areas detaching from the battery cell 12 when the first pressure relief area is opened along the first connection notch 1041 and when the second connection notch 1042 is opened along the second connection notch 1042, thereby reducing the risk of secondary damage to the interior of the battery 100.

[0183] According to some embodiments of the present application, referring to FIG. 16 , the first connection notch 1041 and the second connection notch 1042 are parallel to each other.

[0184] If the first connecting notch 1041 and the second connecting notch 1042 are arranged non-parallel, the distance between the first connecting notch 1041 and the second connecting notch 1042 generally has a smaller value or a larger value. When the distance between the first connecting notch 1041 and the second connecting notch 1042 is smaller, the risk of interference between the first pressure relief area and the second pressure relief area and the parts corresponding to the above positions when they are flipped is higher.

[0185] The first connection notch 1041 and the second connection notch 1042 are parallel to each other. This design reduces the risk that the portion of the pressure relief component 10 located in the first pressure relief area will interfere with the portion of the pressure relief component 10 located in the second pressure relief area when it is opened, resulting in the opening area of ​​the first pressure relief area and the second pressure relief area being too small.

[0186] According to some embodiments of the present application, referring to Figures 4 to 8 and Figures 14 to 16, the first pressure relief notch 1011 and the second pressure relief notch 1012 are symmetrically arranged about the central axis a in the length direction of the pressure relief component or the central axis b in the width direction of the pressure relief component.

[0187] In some embodiments, the pressure relief component 10 is circular in shape, the central axis a in the length direction of the pressure relief component 10 can refer to the direction of any diameter of the circle, and the central axis b in the width direction of the pressure relief component 10 can refer to the direction of the diameter perpendicular to the above diameter direction.

[0188] 12 , the first pressure relief notch 1011 and the second pressure relief notch 1012 are symmetrically arranged about the central axis b in the width direction of the pressure relief component.

[0189] 13 , the first pressure relief notch 1011 and the second pressure relief notch 1012 are symmetrically arranged with respect to the central axis a in the longitudinal direction of the pressure relief component.

[0190] The first pressure relief notch 1011 and the second pressure relief notch 1012 are symmetrically arranged about the longitudinal center axis a or the width center axis b of the pressure relief component. This means that the first pressure relief notch 1011 and the second pressure relief notch 1012 are substantially the same distance from the center 103 of the pressure relief component, and the first pressure relief notch 1011 and the second pressure relief notch 1012 are substantially equally susceptible to rupture when subjected to a force, thereby reducing the risk that one of the first pressure relief notch 1011 or the second pressure relief notch 1012 ruptures first, allowing gas to flow out of the ruptured opening while the other is unable to open due to insufficient force.

[0191] The first pressure relief notch 1011 and the second pressure relief notch 1012 are symmetrically arranged about the longitudinal center axis a or the width center axis b of the pressure relief component. This design ensures that the first pressure relief notch 1011 and the second pressure relief notch 1012 are substantially equally difficult to rupture, allowing the first pressure relief notch 1011 and the second pressure relief notch 1012 to rupture promptly, thereby improving pressure relief efficiency.

[0192] According to some embodiments of the present application, referring to FIG. 20 , first pressure relief score 1011 includes a first straight segment 10114, a first arc segment 10113, and a second arc segment 10115. The first straight segment 10114 is connected at both ends to the first arc segment 10113 and the second arc segment 10115. Second pressure relief score 1012 includes a second straight segment 10124, a third arc segment 10123, and a fourth arc segment 10125. The second straight segment 10124 is connected at both ends to the third arc segment 10123 and the fourth arc segment 10125.

[0193] At the same size, an arc segment can enclose a larger area than a straight line segment. This can be understood as the area between two points enclosed by a straight line is smaller than the area between two points by an arc segment.

[0194] Since the first arc segment 10113 , the second arc segment 10115 , the third arc segment 10123 and the fourth arc segment 10125 are provided to enclose a larger range, the opening formed when the battery cell 12 is depressurized is larger, which facilitates smooth pressure release.

[0195] According to some embodiments of the present application, please refer to Figures 3 and 12-15. The pressure relief component 10 has a first surface 1001 and a second surface 1002 arranged opposite to each other along its thickness direction. The first surface 1001 is provided with a groove 106 recessed toward the second surface 1002. The first pressure relief score 1011 and the second pressure relief score 1012 are provided on the bottom wall of the groove 106. The first pressure relief score 1011 and the second pressure relief score 1012 both extend circumferentially along the side wall of the groove 106.

[0196] Both the first pressure relief score 1011 and the second pressure relief score 1012 extend along the circumference of the side wall of the groove 106 , which means that the first pressure relief score 1011 and the second pressure relief score 1012 can enclose a larger range as much as possible to form a larger opening for exhaust such as hot gas to pass through.

[0197] The first pressure relief notch 1011 and the second pressure relief notch 1012 are spaced apart along the circumferential direction of the side wall of the groove 106 , which is beneficial for the opening formed when the pressure relief component 10 is opened to have a larger area, making the exhaust smoother and faster.

[0198] According to some embodiments of the present application, the present application provides a battery cell 12, comprising the pressure relief component 10 described in any of the above solutions, where the pressure relief component 10 is configured to release the internal pressure of the battery cell 12.

[0199] The battery cell 12 includes a shell 121, and the pressure relief component 10 is provided on the shell 121. Optionally, the pressure relief component 10 can be provided on the shell 121 of the battery cell 12 in various structures. The pressure relief component 10 can be a structure that is separate from the shell 121, or the pressure relief component 10 can be a wall of the shell 121. When the pressure relief component 10 and the shell 121 are separate structures, that is, the shell 121 is provided with a pressure relief hole for installing the pressure relief component 10, and the pressure relief component 10 is connected to the shell 121 and covers the pressure relief hole. The connection method between the pressure relief component 10 and the shell 121 can be various, such as welding or clamping. Similarly, the pressure relief component 10 can be installed on the end cover 1211 of the shell 121, or it can be installed on the shell 1212 of the shell 121. When the pressure relief component 10 is a wall of the shell 121 , that is, the pressure relief component 10 is integrated on the shell 121 and forms a wall of the shell 121 , the pressure relief component 10 can be the end cover 1211 of the shell 121 or a wall of the shell 1212 of the shell 121 .

[0200] According to some embodiments of the present application, the battery cell 12 further includes a housing 121 having a wall portion, wherein the pressure relief component 10 is the wall portion.

[0201] Among them, the shell 121 has a wall portion, and the pressure relief component 10 is the wall portion, that is, the pressure relief component 10 is a wall of the shell 121, that is, the pressure relief component 10 is integrated on the shell 121, and the pressure relief component 10 can be the end cover 1211 of the shell 121, so that the pressure relief component 10 can close the opening of the shell 1212. Of course, the pressure relief component 10 can also be a wall of the shell 1212, so that the pressure relief component 10 can be enclosed with other walls of the shell 1212 to form a accommodating cavity for accommodating the electrode assembly 122.

[0202] The pressure relief component 10 is an end cover 1211 of the outer shell 121 of the battery cell 12 . The pressure relief component 10 is connected to the shell 1212 and covers the opening of the shell 1212 .

[0203] The pressure relief component 10 is a wall of the shell 1212 of the outer shell 121. The pressure relief component 10 is connected to the other walls of the shell 1212 to enclose a housing cavity for accommodating the electrode assembly 122. In this embodiment, the electrode terminal can be installed on the shell 1212 or on the end cover 1211.

[0204] It should be noted that in the embodiment where the pressure relief component 10 is the end cover 1211 of the housing 121 or a wall of the shell 1212, the pressure relief portion of the pressure relief component 10 can be an integrated structure with the reinforcement portion or a separate structure.

[0205] In some embodiments, the battery cell 12 may also have other structures. For example, the battery cell 12 further includes a shell 121 . The shell 121 has a wall portion. The wall portion has a pressure relief hole. The pressure relief component 10 is installed on the wall portion and covers the pressure relief hole.

[0206] The housing 121 has a wall portion, and the pressure relief component 10 is the wall portion of the housing 121 , that is, the pressure relief component 10 is a wall of the housing 121 . The pressure relief notch 101 can be directly processed on the housing 121 , saving processing flow and cost.

[0207] According to some embodiments of the present application, the battery cell 12 further includes a housing 121 having a wall portion with a pressure relief hole, wherein the pressure relief component 10 is mounted on the wall portion and covers the pressure relief hole.

[0208] Among them, the pressure relief component 10 is installed on the wall and covers the pressure relief hole, that is, the pressure relief component 10 is a component independent of the outer shell 121, that is, the pressure relief component 10 and the outer shell 121 are separately arranged structures, and the pressure relief component 10 is connected to the wall of the outer shell 121 through welding and other processes, and covers the pressure relief hole arranged on the wall of the outer shell 121, so that when the pressure relief part of the pressure relief component 10 is destroyed, the battery cell 12 can release the internal pressure of the battery cell 12 through the pressure relief hole.

[0209] The pressure relief component 10 and the housing 121 are separate components, with the pressure relief component 10 being an independent component mounted on a wall of the housing 121. This structure reduces the difficulty of assembling the pressure relief component 10 and the housing 121, thereby improving the production efficiency of the battery cells 12. Furthermore, the pressure relief notches 101 can be pre-machined on the pressure relief component 10 before assembly with the pressure relief holes, reducing the risk of excessive deformation of the housing 121 caused by machining the notches directly on the housing 121.

[0210] According to some embodiments of the present application, the housing 121 includes a shell 1212 and an end cap 1211. The shell 1212 has an opening formed therein to form a receiving cavity for receiving the electrode assembly 122. The end cap 1211 closes the opening and is a wall.

[0211] Among them, the end cover 1211 is the wall, that is, the pressure relief component 10 is the end cover 1211 or the pressure relief component 10 is installed on the end cover 1211, that is, in the embodiment where the pressure relief component 10 is the wall of the outer shell 121, the pressure relief component 10 is the end cover 1211 of the outer shell 121, if in the embodiment where the pressure relief component 10 is installed on the wall of the outer shell 121, the pressure relief hole is provided on the end cover 1211, and the pressure relief component 10 is installed on the end cover 1211 and covers the pressure relief hole.

[0212] By setting the wall portion of the shell 121 as the end cover 1211 for closing the opening of the shell 1212, the battery cell 12 with this structure is conducive to installing a pressure relief part on the end cover 1211, thereby effectively reducing the processing difficulty of the battery cell 12 and improving the production efficiency of the battery cell 12.

[0213] According to some embodiments of the present application, the housing 121 includes a shell 1212 and an end cap 1211. The housing 121 has an opening formed therein to accommodate the electrode assembly 122. The end cap 1211 closes the opening. The housing 1212 includes a wall portion.

[0214] In which, the shell 1212 includes a wall portion, that is, the pressure relief component 10 is a wall of the shell 1212 or the pressure relief component 10 is installed on a wall of the shell 1212. That is to say, in an embodiment in which the pressure relief component 10 is a wall portion of the outer shell 121, the pressure relief component 10 is a wall of the shell 1212. If in an embodiment in which the pressure relief component 10 is installed on the wall portion of the outer shell 121, the pressure relief hole is provided on a wall of the shell 1212, and the pressure relief component 10 is installed on a wall of the shell 1212 and covers the pressure relief hole.

[0215] The housing 1212 may include an integrally formed side wall and a bottom wall. The side wall surrounds the bottom wall. Along the thickness direction of the bottom wall, one end of the side wall is connected to the bottom wall, and the other end is enclosed to form an opening. The bottom wall is disposed opposite the end cap 1211. The side wall and the bottom wall together define a cavity for accommodating the electrode assembly 122, and the end cap 1211 closes the opening. The side wall includes four walls connected in sequence, including two first walls disposed opposite each other and two second walls disposed opposite each other. The first wall is the surface with the largest area among the outer surfaces of the battery cell 12. Optionally, the wall portion may be the bottom wall of the housing 1212, the first wall of the housing 1212, or the second wall of the housing 1212. In some embodiments, the wall portion is the first wall of the housing 1212. Since the outer surface area of ​​the first wall is the largest, the pressure relief notch 101 can be arranged more flexibly, and the processing and design difficulty of the pressure relief notch 101 is relatively low.

[0216] By setting the wall portion of the outer shell 121 as a wall of the shell 1212, the battery cell 12 adopting this structure can reduce the impact of the stress generated when the end cover 1211 and the shell 1212 are connected to each other on the pressure relief notch 101, thereby reducing the occurrence of abnormal cracking of the pressure relief notch 101, and thereby improving the reliability of the battery cell 12.

[0217] According to some embodiments of the present application, the present application provides a battery 100 including the battery cell 12 described in any of the above solutions.

[0218] According to some embodiments of the present application, an electrical device is provided, comprising the battery cell 12 described in any of the above solutions, the battery cell 12 being used to provide electrical energy. Alternatively, the device comprises the battery 100 described in any of the above solutions, the battery 100 being used to provide electrical energy.

[0219] According to some embodiments of the present application, referring to Figures 4, 13-15, 19 and 20, the present application provides a pressure relief component 10 for a battery cell 12, the pressure relief component 10 is provided with at least two pressure relief notches 101, each pressure relief notch 101 and the connecting line at both ends of the pressure relief notch 101 form a first area 102, multiple first areas 102 are arranged at intervals, and the connecting line of at least one first area 102 is located on the side of the first area 102 close to the center 103 of the pressure relief component.

[0220] The at least two pressure relief notches 101 include a first pressure relief notch 1011 and a second pressure relief notch 1012. The pressure relief component 10 has a first surface 1001 and a second surface 1002 disposed opposite each other along its thickness direction. The first surface 1001 is provided with a groove 106 that is recessed toward the second surface 1002. The first pressure relief notch 1011 and the second pressure relief notch 1012 are disposed on the bottom wall of the groove 106. The first pressure relief notch 1011 and the second pressure relief notch 1012 both extend circumferentially along the sidewalls of the groove 106. The pressure relief component 10 is disposed on the end cap 1211 of the battery cell 12. The end cap 1211 is provided with a pressure relief hole, which is covered by the pressure relief component 10. The end cap 1211 is also provided with an annular boss disposed around the pressure relief hole. The inner wall of the annular boss and the pressure relief component 10 together form the aforementioned groove 106.

[0221] The first pressure relief notch 1011 and the second pressure relief notch 1012 are both bent in a direction away from the center of the pressure relief component 10. The first pressure relief notch 1011 has a first end 10111 and a second end 10112. The second pressure relief notch 1012 has a third end 10121 close to the first end 10111 and a fourth end 10122 close to the second end 10112. The first end 10111 and the third end 10121 are spaced apart, and the second end 10112 and the fourth end 10122 are spaced apart.

[0222] First pressure relief score 1011 includes a first straight line segment 10114, a first arc segment 10113, and a second arc segment 10115. The two ends of first straight line segment 10114 are respectively connected to first arc segment 10113 and second arc segment 10115. Second pressure relief score 1012 includes a second straight line segment 10124, a third arc segment 10123, and a fourth arc segment 10125. The two ends of second straight line segment 10124 are respectively connected to third arc segment 10123 and fourth arc segment 10125.

[0223] The pressure relief component 10 is further provided with a first connecting notch 1041, one end of which is connected to the first end 10111, and the other end of which is connected to the second end 10112. The first connecting notch 1041 and the first pressure relief notch 1011 form a first pressure relief region, and the thickness of the pressure relief component 10 at the first connecting notch 1041 is greater than the thickness of the pressure relief component 10 at the first pressure relief notch 1011. The pressure relief component 10 is further provided with a second connecting notch 1042, one end of which is connected to the third end 10121, and the other end of which is connected to the fourth end 10122. The second connecting notch 1042 and the second pressure relief notch 1012 form a second pressure relief region, and the thickness of the pressure relief component 10 at the second connecting notch 1042 is greater than the thickness of the pressure relief component 10 at the second pressure relief notch 1012.

[0224] The first connecting score 1041 includes a first main section 10411, a first connecting section 10412, and a second connecting section 10413. One end of the first main section 10411 is connected to the first end 10111 of the first pressure relief score 1011 through the first connecting section 10412, and the other end of the first main section 10411 is connected to the second end 10112 of the first pressure relief score 1011 through the second connecting section 10413. The second connecting score 1042 includes a second main section 10421, a third connecting section 10422, and a fourth connecting section 10423. One end of the second main section 10421 is connected to the first end 10111 of the second pressure relief score 1012 through the third connecting section 10422, and the other end of the second main section 10421 is connected to the second end 10112 of the second pressure relief score 1012 through the fourth connecting section 10423. The first main section 10411 overlaps with the second main section 10421.

[0225] At least one first reinforcement score 1051 is provided in the first pressure relief region. The thickness of the pressure relief component 10 at the first reinforcement score 1051 is greater than the thickness of the pressure relief component 10 at the first pressure relief score 1011. The first reinforcement score 1051 is connected to the first pressure relief score 1011 and the first connecting score 1041. At least one second reinforcement score 1052 is provided in the second pressure relief region. The thickness of the pressure relief component 10 at the second reinforcement score 1052 is greater than the thickness of the pressure relief component 10 at the second pressure relief score 1012. The second reinforcement score 1052 is connected to the second pressure relief score 1012 and the second connecting score 1042.

[0226] The first pressure relief notch 1011 and the second pressure relief notch 1012 are symmetrically arranged with respect to the central axis a in the longitudinal direction of the pressure relief component.

[0227] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A pressure relief component for a battery cell, wherein: The pressure relief component is provided with at least two pressure relief notches, each of the pressure relief notches and the connecting line at both ends of the pressure relief notch enclose a first area, a plurality of the first areas are arranged at intervals, and the connecting line of at least one of the first areas is located on the first area close to the center side of the pressure relief component.

2. The pressure relief component according to claim 1, wherein: A plurality of the first regions are spaced apart around the center of the pressure relief component, and each of the pressure relief notches is bent in a direction away from the center of the pressure relief component.

3. The pressure relief component according to any one of claims 1 to 2, wherein: The thickness of the pressure relief component at the pressure relief notch is T1, satisfying: T1 ≥ 0.03 mm.

4. The pressure relief component according to any one of claims 1 to 3, wherein: The pressure relief component is provided with at least two connecting notches, the connecting notches correspond to the pressure relief notches one by one, both ends of each pressure relief notch are connected by the connecting notches, and the thickness of the pressure relief component at the connecting notches is greater than the thickness of the pressure relief component at the pressure relief notches.

5. The pressure relief component according to claim 4, wherein: The thickness of the pressure relief component at the connection notch is T2, satisfying: T2 ≥ 0.04 mm.

6. The pressure relief component according to any one of claims 1 to 5, wherein: The first region is provided with a reinforcement notch, and the thickness of the pressure relief component at the reinforcement notch is greater than the thickness of the pressure relief component at the pressure relief notch.

7. The pressure relief component according to claim 6, wherein: The thickness of the pressure relief component at the reinforced notch is T3, satisfying: T3 ≥ 0.04 mm.

8. The pressure relief component according to any one of claims 1 to 7, wherein: The pressure relief component has a first surface and a second surface arranged opposite to each other along its thickness direction, the first surface is provided with a groove recessed toward the second surface, the pressure relief notch is provided on the bottom wall of the groove, and a plurality of the pressure relief notches are arranged at intervals along the circumferential direction of the side wall of the groove.

9. The pressure relief component according to any one of claims 1 to 8, wherein: The at least two pressure relief scores include a first pressure relief score and a second pressure relief score, both of which are bent in a direction away from the center of the pressure relief component, the first pressure relief score having a first end and a second end, the second pressure relief score having a third end close to the first end and a fourth end close to the second end, the first end is spaced apart from the third end, and the second end is spaced apart from the fourth end.

10. The pressure relief component according to claim 9, wherein: The pressure relief component is also provided with a first connecting notch, one end of the first connecting notch is connected to the first end, the other end of the first connecting notch is connected to the second end, the first connecting notch and the first pressure relief notch form a first pressure relief area, and the thickness of the pressure relief component at the first connecting notch is greater than the thickness of the pressure relief component at the first pressure relief notch.

11. The pressure relief component according to claim 10, wherein: At least one first reinforcement notch is provided in the first pressure relief area, the thickness of the pressure relief component at the first reinforcement notch is greater than the thickness of the pressure relief component at the first pressure relief notch, and the first reinforcement notch is connected to the first pressure relief notch and / or the first connection notch.

12. The pressure relief component according to claim 11, wherein: Two ends of the first reinforcement notch are respectively connected to the first pressure relief notch and the first connection notch.

13. The pressure relief component according to any one of claims 10 to 12, wherein: The pressure relief component is also provided with a second connecting notch, one end of the second connecting notch is connected to the third end, the other end of the second connecting notch is connected to the fourth end, the second connecting notch and the second pressure relief notch form a second pressure relief area, and the thickness of the pressure relief component at the second connecting notch is greater than the thickness of the pressure relief component at the second pressure relief notch.

14. The pressure relief component according to claim 13, wherein: At least one second reinforcement score is provided in the second pressure relief area, the thickness of the pressure relief component at the second reinforcement score is greater than the thickness of the pressure relief component at the second pressure relief score, and the second reinforcement score is connected to the second pressure relief score and / or the second connection score.

15. The pressure relief component according to claim 14, wherein: Two ends of the second reinforcement notch are respectively connected to the second pressure relief notch and the second connection notch.

16. The pressure relief component according to any one of claims 13 to 15, wherein: The first connection notch and the second connection notch at least partially overlap.

17. The pressure relief component according to claim 16, wherein: The first connecting notch and the second connecting notch are the same notch.

18. The pressure relief component according to any one of claims 13 to 15, wherein: The first connecting notch includes a first main body section, a first connecting section, and a second connecting section, one end of the first main body section is connected to the first end of the first pressure relief notch through the first connecting section, and the other end of the first main body section is connected to the second end of the first pressure relief notch through the second connecting section; The second connecting score includes a second main body segment, a third connecting segment and a fourth connecting segment, one end of the second main body segment is connected to the first end of the second pressure relief score through the third connecting segment, the other end of the second main body segment is connected to the second end of the second pressure relief score through the fourth connecting segment, and the first main body segment overlaps with the second main body segment.

19. The pressure relief component according to any one of claims 13 to 15, wherein: The first connection notch and the second connection notch are arranged at intervals.

20. The pressure relief component according to claim 19, wherein: The first connecting notch and the second connecting notch are parallel to each other.

21. The pressure relief component according to any one of claims 9 to 20, wherein: The first pressure relief notch and the second pressure relief notch are symmetrically arranged with respect to a central axis in a length direction of the pressure relief component or a central axis in a width direction of the pressure relief component.

22. The pressure relief component according to any one of claims 9 to 20, wherein: The first pressure relief notch includes a first straight line segment, a first arc segment, and a second arc segment, and two ends of the first straight line segment are respectively connected to the first arc segment and the second arc segment; The second pressure relief notch includes a second straight line segment, a third arc segment and a fourth arc segment, and two ends of the second straight line segment are respectively connected to the third arc segment and the fourth arc segment.

23. The pressure relief component according to any one of claims 9 to 20, wherein: The pressure relief component has a first surface and a second surface arranged opposite to each other along its thickness direction, the first surface is provided with a groove recessed toward the second surface, the first pressure relief score and the second pressure relief score are arranged on the bottom wall of the groove, and the first pressure relief score and the second pressure relief score both extend along the circumference of the side wall of the groove.

24. A battery cell, wherein: The method comprises the pressure relief component according to any one of claims 1 to 23, wherein the pressure relief component is configured to release the internal pressure of the battery cell.

25. The battery cell according to claim 24, wherein: The battery cell further comprises: a housing having a wall portion; Wherein, the pressure relief component is the wall portion.

26. The battery cell according to claim 24, 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.

27. The battery cell according to claim 25 or 26, 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.

28. The battery cell according to claim 25 or 26, 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.

29. A battery, wherein: Comprising the battery cell according to any one of claims 24-28.

30. An electrical device, wherein: The electrical device comprises a battery cell as claimed in any one of claims 24 to 28, wherein the battery cell is used to provide electrical energy; Or, the electrical device includes the battery as described in claim 29, and the battery is used to provide electrical energy.

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