Battery monomer, battery device and electric device

Abstract

The utility model relates to a battery monomer, a battery device and a power utilization device. The single battery comprises a shell, an end cover, an electrode assembly and a pressure relief mechanism, a pressure relief hole is formed in the end cover, the pressure relief mechanism is mounted in the pressure relief hole, the pressure relief mechanism comprises a main body part and a protruding part, and the protruding part is arranged on the periphery of the main body part and protrudes out of the main body part in the thickness direction of the pressure relief mechanism; the protruding part is provided with at least one matching face, and each matching face is matched with the hole wall of the pressure relief hole. Due to the fact that the protruding part is arranged on the periphery of the pressure relief part of the main body part, pressure relief of the pressure relief part cannot be affected, the protruding part protrudes out of the main body part in the thickness direction of the pressure relief mechanism and is provided with at least one matching face matched with the hole wall of the pressure relief hole, fool-proof can be achieved through matching of the protruding part and the pressure relief hole, and the safety of the pressure relief mechanism is improved. And the pressure relief mechanism can be positively mounted, so that the pressure relief direction of the pressure relief mechanism is correct, and the reliability of the single battery is improved.

Description

Technical Field

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

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] To improve battery reliability, explosion-proof valves are often installed on the end caps of battery cells. These valves consist of a rupture disc with a notched groove. When the valve opens, air pressure ruptures the notched area of ​​the disc, releasing pressure from the battery cell. When properly installed, the notched groove faces the outside of the battery cell. However, in related art, the disc is sometimes installed in reverse, reducing battery reliability. Utility Model Content

[0004] In view of the problem, the present application provides a battery cell, a battery device and an electrical device, which can alleviate the problem of reduced battery reliability due to reverse installation of the explosion-proof plate.

[0005] In a first aspect, the present application provides a battery cell, comprising:

[0006] a housing having an opening on one side;

[0007] The end cover is arranged at the opening and encloses the housing to form a receiving cavity, and a pressure relief hole is provided on the end cover;

[0008] The electrode assembly is arranged in the accommodating cavity;

[0009] The pressure relief mechanism is installed in the pressure relief hole. The pressure relief mechanism includes a main body with a pressure relief function and a protruding portion. The protruding portion is arranged on the outer periphery of the main body and protrudes from the main body along the thickness direction of the pressure relief mechanism; the protruding portion has at least one mating surface, and each mating surface is matched with the hole wall of the pressure relief hole.

[0010] In the battery cell, when the pressure relief mechanism is mounted on the pressure relief hole, the protruding portion is disposed on the outer periphery of the main body having the pressure relief function, thereby preventing the pressure relief from being affected. Furthermore, the protruding portion protrudes from the main body along the thickness direction of the pressure relief mechanism and has at least one mating surface that mates with the wall of the pressure relief hole. Therefore, the mating surface of the protruding portion and the pressure relief hole ensures a foolproof fit, enabling the pressure relief mechanism to be installed in the correct direction, thereby improving the reliability of the battery cell. Furthermore, the mating surface of the protruding portion mates with the wall of the pressure relief hole, thereby improving the assembly accuracy and reliability of the pressure relief mechanism relative to the end cap.

[0011] In some embodiments, along the radial direction of the pressure relief hole, at least one mating surface of the protruding portion abuts against a hole wall of the pressure relief hole.

[0012] Since the mating surface of the protruding portion abuts against the hole wall of the pressure relief hole along the radial direction of the pressure relief hole, the mating surface of the protruding portion can be matched with the hole wall of the pressure relief hole, thereby achieving a fool-proof effect, enabling the pressure relief mechanism to be installed in the positive direction, and improving the reliability of the battery cell.

[0013] In addition, since the pressure relief mechanism is usually installed along the axial direction of the pressure relief hole, the radial direction cooperation is easier to distinguish from the axial direction installation positioning of the pressure relief mechanism than the axial direction cooperation, is easier to identify, and has a better anti-mistake effect.

[0014] In some embodiments, the mating surface of the protruding portion includes a first mating surface and a second mating surface, and the first mating surface and the second mating surface are arranged to intersect.

[0015] By intersecting the first mating surface of the protruding portion with the second mating surface, a fit can be formed with the hole wall of the pressure relief hole in two intersecting directions, making the fitting relationship between the protruding portion and the pressure relief hole tighter, improving the fitting accuracy, and thus improving the anti-mistake effect.

[0016] In some embodiments, along the radial direction of the pressure relief hole, the first mating surface abuts against the hole wall of the pressure relief hole; along the axial direction of the pressure relief hole, the second mating surface abuts against the hole wall of the pressure relief hole.

[0017] The matching method of making the first matching surface and the second matching surface abut against the hole wall of the pressure relief hole along the radial direction and the axial direction of the pressure relief hole is simpler and the matching relationship is more reliable, thereby improving the anti-fouling reliability.

[0018] In some embodiments, the pressure relief hole includes a main hole and a positioning groove, the positioning groove surrounds the main hole and is connected to the main hole along the axial direction of the pressure relief hole to form a first stepped hole, and along the axial direction of the pressure relief hole, the projection of the main body toward the pressure relief hole at least partially falls into the main hole;

[0019] Along the radial direction of the pressure relief hole, the first matching surface abuts against the groove side wall of the positioning groove, and along the axial direction of the pressure relief hole, the second matching surface abuts against the groove bottom wall of the positioning groove.

[0020] By forming a first step hole in the pressure relief hole through the main hole and the positioning groove, on the one hand, the pressure relief of the main body is not affected, and on the other hand, the protruding part and the positioning groove can be reliably abutted, which simplifies the positioning method of the protruding part relative to the pressure relief hole, improves the positioning reliability, and makes the anti-mistake effect better.

[0021] In some embodiments, along the radial direction of the pressure relief hole, a portion of the second matching surface protrudes into the main hole.

[0022] When part of the second mating surface protrudes from the main hole along the radial direction of the pressure relief hole, a part of the protrusion is located in the positioning groove, and the other part of the protrusion can protrude inwardly into the main hole, thereby providing a certain margin for the positioning fit of the protrusion and the positioning groove. The size of the protrusion along the radial direction of the pressure relief hole is also wider, and the structure of the protrusion is more reliable, thereby improving the reliability of the positioning fit as a whole.

[0023] In some embodiments, the protrusion is arranged in a complete circle around the outer circumference of the main body;

[0024] Alternatively, the protruding portion includes a plurality of sub-protruding portions, each of which protrudes from the main body along the thickness direction of the pressure relief mechanism, and all the sub-protruding portions surround the outer circumference of the main body and are spaced apart from each other.

[0025] When the protrusion is arranged in a full circle or includes multiple protrusions arranged around the outer circumference of the main body, the protrusion can be circumferentially matched with the pressure relief hole, thereby making the positioning reliability of the protrusion relative to the pressure relief hole higher, the two fit more closely, the anti-fouling effect is improved, and the assembly accuracy and reliability of the pressure relief mechanism relative to the end cover are further improved.

[0026] In some embodiments, when the protrusion includes a plurality of sub-protrusions, at least two sub-protrusions are spaced relative to the center of the pressure relief mechanism along the length direction of the pressure relief mechanism;

[0027] And / or at least two protrusions are spaced apart relative to the center of the pressure relief mechanism along the width direction of the pressure relief mechanism.

[0028] When at least two sub-protrusions are spaced relative to the center of the pressure relief mechanism along the length of the pressure relief mechanism, the sub-protrusions on both sides of the pressure relief mechanism in the length direction can form a positioning relationship with the pressure relief hole, which not only improves the foolproofing effect but also increases the assembly accuracy and reliability of the pressure relief mechanism relative to the end cap. When at least two sub-protrusions are spaced relative to the center of the pressure relief mechanism along the width of the pressure relief mechanism, the sub-protrusions on both sides of the pressure relief mechanism in the width direction can form a positioning relationship with the pressure relief hole, which not only improves the foolproofing effect but also increases the assembly accuracy and reliability of the pressure relief mechanism relative to the end cap.

[0029] In some embodiments, the pressure relief mechanism further includes a connecting portion, which is disposed around the outer circumference of the main body and is connected to the end cover.

[0030] Since the connecting portion is arranged on the outer periphery of the protruding portion, that is, the protruding portion is arranged on the inner side of the connecting portion, the arrangement of the protruding portion will not affect the connection arrangement between the connecting portion and the end cover. Therefore, on the one hand, the anti-fouling reliability is improved, and on the other hand, the connection reliability of the pressure relief mechanism and the end cover is improved.

[0031] In some embodiments, when the pressure relief hole includes a main hole and a positioning groove, the pressure relief hole further includes a connecting groove, which surrounds the positioning groove and is connected to the positioning groove along the axial direction of the pressure relief hole to form a second stepped hole;

[0032] Along the radial direction of the pressure relief hole, the connecting portion abuts against the groove side wall of the connecting groove, and along the axial direction of the pressure relief hole, the connecting portion abuts against the groove bottom wall of the connecting groove.

[0033] In this way, the connecting part can also be limited by the connecting groove and positioned in the pressure relief hole, and can also cooperate with the protruding part to jointly improve the assembly accuracy of the pressure relief mechanism. In addition, since the connecting part is positioned in the pressure relief hole, the connection between the connecting part and the end cover is also more reliable.

[0034] In some embodiments, the pressure relief mechanism further includes a connecting portion, which is annular and disposed on the outer periphery of the protruding portion, and is connected to the end cover;

[0035] The pressure relief hole includes a main hole and a connecting groove. The connecting groove surrounds the main hole and is connected to the main hole along the axial direction of the pressure relief hole to form a third stepped hole. Along the axial direction of the pressure relief hole, the projection of the main body toward the pressure relief hole at least partially falls into the main hole.

[0036] Along the radial direction of the pressure relief hole, at least one mating surface of the protruding portion abuts against the groove side wall of the main hole, the connecting portion abuts against the groove side wall of the connecting groove, and along the axial direction of the pressure relief hole, the connecting portion abuts against the groove bottom wall of the connecting groove.

[0037] By forming a third stepped hole in the pressure relief hole through cooperation between the main hole and the connecting groove, the protruding portion and the pressure relief hole can be reliably abutted against the groove side wall of the main hole, and the connecting portion can also be positioned in the pressure relief hole due to the connection groove, and can also cooperate with the protruding portion to jointly improve the assembly accuracy of the pressure relief mechanism. In addition, since the connecting portion is positioned in the pressure relief hole, the connection between the connecting portion and the end cover is also more reliable.

[0038] In some embodiments, along the thickness direction of the pressure relief mechanism, the protruding portion protrudes from the main body by a height of 0.2 mm to 1 mm.

[0039] When the protruding height of the protruding portion from the main body is 0.2 mm to 1 mm, the protruding portion is more obvious than the main body, and the offset area with the pressure relief hole is large, which can form a more reliable positioning and matching relationship with the pressure relief hole, thereby improving the anti-foolproof effect.

[0040] In some embodiments, the main body includes a pressure relief portion, and along the thickness direction of the pressure relief mechanism, the thickness of the pressure relief portion is smaller than the thickness of the remaining portion of the main body.

[0041] Since the thickness of the pressure relief portion is smaller than the thickness of the rest of the main body, the pressure relief portion, as a weak structure, can be destroyed when the internal pressure or temperature of the battery cell reaches a threshold value to form an opening or channel for releasing the internal pressure or temperature.

[0042] In addition, when installing the pressure relief mechanism to the end cover, the thickness of the pressure relief part is smaller than the thickness of the rest of the main body, which is not easy to be identified by the operator or automated equipment. Therefore, it is easy to install the pressure relief mechanism in reverse. By providing a protruding part on the outer periphery of the pressure relief part, the anti-foolproof effect can be improved and the risk of reverse installation of the pressure relief mechanism can be reduced.

[0043] In some embodiments, the pressure relief portion is configured as a scored groove provided on the main body portion.

[0044] The method of forming a pressure relief portion by providing a notched groove is simple, and the notched groove is usually relatively small and not easily identified by operators or automated equipment. Therefore, it is easy to install the pressure relief mechanism in reverse. By providing a protruding portion on the periphery of the notched groove, the fool-proof effect can be improved and the risk of reverse installation of the pressure relief mechanism can be reduced.

[0045] In some embodiments, the depth of the scored groove along the thickness direction of the pressure relief mechanism is 0.04 mm to 0.16 mm.

[0046] When the depth of the notch is between 0.04 mm and 0.16 mm, the notch is shallow and less easily discerned by operators or automated equipment. Therefore, it is easy for the pressure relief mechanism to be installed in reverse. Providing a protruding portion around the periphery of the notch improves foolproofing and reduces the risk of reverse installation of the pressure relief mechanism.

[0047] In some embodiments, the end cap has a first surface and a second surface disposed opposite to each other along the thickness direction of the end cap, the second surface being disposed closer to the accommodating cavity than the first surface, and the pressure relief hole extending from the first surface to the second surface;

[0048] The pressure relief hole forms a pressure relief port on the second surface, the pressure relief mechanism is installed at the pressure relief port, the main body includes a pressure relief portion, the pressure relief portion is arranged toward the first surface, and the protruding portion protrudes from the main body toward the first surface;

[0049] Alternatively, the pressure relief hole forms a pressure relief port on the first surface, the pressure relief mechanism is installed at the pressure relief port, the main body includes a pressure relief portion, the pressure relief portion is arranged facing away from the second surface, and the protruding portion protrudes from the main body toward the second surface.

[0050] When the pressure relief port is formed on the second surface, that is, at the bottom of the pressure relief hole, when the pressure relief mechanism is mounted from the pressure relief port to the pressure relief hole, the pressure relief portion is arranged toward the first surface, which is a positive installation. Therefore, by arranging the protruding portion to protrude from the main body toward the first surface, the protruding portion can form a positioning and matching relationship with the pressure relief hole, thereby achieving a foolproof effect. When the pressure relief port is formed on the first surface, that is, at the top of the pressure relief hole, when the pressure relief mechanism is mounted from the pressure relief port to the pressure relief hole, the pressure relief portion is arranged away from the second surface, which is a positive installation. Therefore, by arranging the protruding portion to protrude from the main body toward the second surface, the protruding portion can form a positioning and matching relationship with the pressure relief hole, thereby achieving a foolproof effect.

[0051] In a second aspect, a battery device is provided, comprising the battery cell according to any of the above embodiments.

[0052] In the battery device described above, when the pressure relief mechanism is mounted on the pressure relief hole, the protruding portion is disposed on the outer periphery of the main body having the pressure relief function, thereby preventing pressure relief. Furthermore, the protruding portion protrudes from the main body along the thickness direction of the pressure relief mechanism and has at least one mating surface that mates with the wall of the pressure relief hole. Therefore, the mating of the protruding portion with the pressure relief hole provides foolproofing, enabling the pressure relief mechanism to be installed in the correct orientation, thereby ensuring the correct pressure relief direction and improving the reliability of the battery cell. Furthermore, the mating surface of the protruding portion that mates with the wall of the pressure relief hole also improves the assembly accuracy and reliability of the pressure relief mechanism relative to the end cap.

[0053] In a third aspect, an electrical device is also provided, comprising the battery device in any of the above embodiments.

[0054] In the above-mentioned electrical device, when the pressure relief mechanism is mounted to the pressure relief hole, the protruding portion is disposed on the outer periphery of the main body having the pressure relief function, thereby preventing the pressure relief from being affected. Furthermore, the protruding portion protrudes from the main body along the thickness direction of the pressure relief mechanism and has at least one mating surface that mates with the wall of the pressure relief hole. Therefore, the mating surface of the protruding portion and the pressure relief hole can achieve foolproofing, enabling the pressure relief mechanism to be installed in the correct direction, thereby ensuring the correct pressure relief direction of the pressure relief mechanism and improving the reliability of the battery cell. Furthermore, the mating surface of the protruding portion mates with the wall of the pressure relief hole, thereby improving the assembly accuracy and reliability of the pressure relief mechanism relative to the end cap.

[0055] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] 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:

[0057] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments.

[0058] Figure 2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments.

[0059] Figure 3 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments.

[0060] Figure 4 Schematic diagram of the structure of an end cover of a battery cell according to one or more embodiments.

[0061] Figure 5 Schematic diagram of the structure of a pressure relief mechanism according to one or more embodiments.

[0062] Figure 6 for Figure 4 The schematic diagram of the top view of the end cover is shown.

[0063] Figure 7 for Figure 6 AA cross-sectional structural diagram of the end cover shown.

[0064] Figure 8 for Figure 7 An enlarged schematic diagram of a portion B of the end cap is shown.

[0065] Figure 9 It is a partially enlarged schematic diagram of an end cover according to one or more other embodiments.

[0066] The accompanying drawings in the specific implementation manner are as follows:

[0067] Vehicle 1000, battery device 100, housing 10, first part 11, second part 12, battery cell 20, end cap 21, electrode terminal 211, pressure relief hole 212, main hole 2121, positioning groove 2122, connecting groove 2123, first surface 213, second surface 214, shell 22, opening 221, electrode assembly 23, tab 231, pressure relief mechanism 24, main body 241, pressure relief portion 2411, support portion 2412, protruding portion 242, mating surface 2421, first mating surface 2422, second mating surface 2423, connecting portion 243, protective sheet 25, controller 200, motor 300. DETAILED DESCRIPTION

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 exists alone, 1 and 2 exist simultaneously, and 2 exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0073] 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).

[0074] 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.

[0075] 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.

[0076] The battery device is formed by combining multiple battery cells. Each battery cell generally includes an end cap, a shell and an electrode assembly. The end cap is covered at one side opening of the shell to close the opening and form a storage space for the electrode assembly between the end cap and the shell.

[0077] Battery cell end caps are typically equipped with a pressure relief mechanism, designed to release internal pressure when the cell's internal pressure or temperature reaches a threshold. Common pressure relief mechanisms include explosion-proof valves, which include rupture discs. These discs can be formed into a weak structure that breaks when the cell's internal pressure or temperature reaches a threshold, creating an opening or channel for the internal pressure or temperature to be released. Typically, the weak structure has a lower melting point and / or thickness than other areas of the disc. For example, the weak structure can be a scored groove on the disc's surface.

[0078] When the explosion-proof disc is installed on the end cap of the battery cell, it is necessary to ensure that the notched groove faces outward so that during the pressure relief process, the disc can crack outward along the notched groove, thereby improving the reliability of the battery cell. However, in actual production, there are cases where the notched groove on the explosion-proof disc faces inward, that is, the explosion-proof disc is installed in reverse. This may not only change the bursting pressure of the explosion-proof disc, but also change the cracking direction of the explosion-proof disc. During the pressure relief process, secondary damage may be caused to the internal structures of the battery cell (such as the electrode assembly, electrolyte, etc.), affecting the reliability of the battery cell.

[0079] Research has found that the reason for reverse installation of the rupture disk is that the disc's notch is shallow, which can weaken its anti-mistakable function. This can lead to operators or automated equipment misjudging the installation direction and installing the rupture disk in the wrong direction. This situation can also occur with other weak pressure relief mechanisms.

[0080] To alleviate the problem of battery cell reliability being affected by reverse installation of a pressure relief mechanism, a battery cell is provided, comprising a housing, an end cap, an electrode assembly, and a pressure relief mechanism. The housing has an opening on one side, the end cap is positioned over the opening, and together with the housing, forms a receiving cavity. The end cap is provided with a pressure relief hole, the electrode assembly is positioned within the receiving cavity, and the pressure relief mechanism is mounted within the pressure relief hole. The pressure relief mechanism comprises a main body and a protruding portion. The protruding portion is positioned on the periphery of the main body and extends from the main body along the thickness direction of the pressure relief mechanism. The protruding portion has at least one mating surface, each mating surface mating with the wall of the pressure relief hole.

[0081] Thus, when the pressure relief mechanism is mounted on the pressure relief hole, the protrusion is located on the periphery of the main body having the pressure relief function, thereby preventing pressure relief. Furthermore, the protrusion protrudes from the main body along the thickness direction of the pressure relief mechanism and has at least one mating surface that mates with the wall of the pressure relief hole. Therefore, the mating of the protrusion and the pressure relief hole ensures foolproof installation, ensuring the pressure relief mechanism can be installed in the correct direction, thereby improving the reliability of the battery cell. Furthermore, the mating surface of the protrusion mates with the wall of the pressure relief hole, thereby improving the assembly accuracy and reliability of the pressure relief mechanism relative to the end cap.

[0082] The battery cell of the present application is applied to a battery to alleviate the problem that the reliability of the battery cell is affected by the reverse installation of the pressure relief mechanism.

[0083] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft.

[0084] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[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] Please refer to Figure 1 , Figure 1A schematic structural diagram of a vehicle 1000 provided for 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, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0087] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0088] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0089] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 20 may be housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0090] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0091] Please refer to Figure 3 , Figure 3 The following is a schematic diagram of the decomposition structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap 21, a shell 22, an electrode assembly 23 and other functional components.

[0092] The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. Optionally, the end cap 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 21 from deforming under compression or collision, thereby enhancing the structural strength and safety of the battery cell 20. The end cap 21 can be provided with functional components such as electrode terminals 211. The electrode terminals 211 can be used to electrically connect to the electrode assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism 24 for relieving internal pressure in the battery cell 20 when the internal pressure or temperature reaches a threshold. The end cap 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiments. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0093] The housing 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be separate components. An opening can be provided in the housing 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and housing 22 can be integrated. Specifically, the end cap 21 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the end cap 21 is placed over the housing 22. The housing 22 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the electrode assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0094] The electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is primarily composed of positive and negative electrode materials, a separator, and a current collector. Specifically, the positive electrode material is coated on the battery output connector to form a positive electrode sheet, and the negative electrode material is coated on the battery output connector to form a negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and the separator is disposed between the positive and negative electrode sheets to form the electrode assembly 23. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute a tab 231. The positive and negative electrode tabs may be located together at one end of the main body or separately at both ends of the main body. During the battery's charge and discharge process, the positive and negative electrode active materials react with the electrolyte, and the tabs 231 connect to the electrode terminals 211 to form a current circuit.

[0095] See attached Figures 4 to 8 , an embodiment of the present application provides a battery cell 20, including an end cover 21, a shell 22, an electrode assembly 23 and a pressure relief mechanism 24. One side of the shell 22 has an opening 221, the end cover 21 is covered at the opening, and is enclosed with the shell 22 to form a accommodating cavity, and a pressure relief hole 212 is provided on the end cover 21. The electrode assembly 23 is arranged in the accommodating cavity. The pressure relief mechanism 24 is installed in the pressure relief hole 212, and the pressure relief mechanism 24 includes a main body 241 and a protruding portion 242. The protruding portion 242 is provided on the outer periphery of the main body 241 and protrudes from the main body 241 along the thickness direction of the pressure relief mechanism 24. The protruding portion 242 has at least one mating surface 2421, and each mating surface 2421 is matched with the hole wall of the pressure relief hole 212.

[0096] The pressure relief mechanism 24 refers to a mechanism for releasing the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a threshold value. Therefore, the above-mentioned pressure relief function can be understood as a function of releasing the internal pressure of the battery cell 20. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the electrode, electrolyte and isolation membrane in the battery cell 20. The pressure relief mechanism 24 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 20 reach a predetermined threshold value, the pressure relief mechanism 24 performs an action or the weak structure provided in the pressure relief mechanism 24 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0097] The weak structure referred to here can be considered as the pressure relief portion 2411 of the main body 241. Generally, the melting point and / or thickness of the pressure relief portion 2411 is lower than other areas of the pressure relief mechanism 24. For example, the pressure relief portion 2411 can be a notched groove provided on the surface of the pressure relief mechanism 24.

[0098] The main body 241 refers to the portion of the pressure relief mechanism 24 that performs the action or provides a weak structure. Specifically, the main body 241 may include the pressure relief portion 2411 described above, and may also include a support portion 2412 connected to the pressure relief portion 2411. The main body 241 may be in the shape of an elliptical sheet, a circular sheet, or the like.

[0099] The thickness direction of the pressure relief mechanism 24 can be consistent with the thickness direction of the end cover 21, specifically Figure 7 The protruding portion 242 protrudes from the main body 241 along the thickness direction of the pressure relief mechanism 24, that is, the protruding portion 242 protrudes further than the pressure relief portion 2411. Specifically, the pressure relief portion 2411 is provided on the first side of the main body 241 facing away from the accommodating cavity, and the protruding portion 242 can be provided on the first side of the main body 241 and protrude from the first side of the main body 241. Of course, the protruding portion 242 can also be provided on the second side of the main body 241 opposite the first side and protrude from the second side of the main body 241. The specific protruding direction of the above-mentioned protruding portion 242 can be determined by the position of the pressure relief mechanism 24 relative to the pressure relief hole 212. For example, when the pressure relief mechanism 24 is installed at the bottom of the pressure relief hole 212, that is, when the end cover 21 is facing the side of the accommodating cavity, the protruding portion 242 can be set on the first side of the main body 241 and protrude from the first side of the main body 241. When the pressure relief mechanism 24 is installed at the top of the pressure relief hole 212, that is, when the end cover 21 is facing away from the accommodating cavity, the protruding portion 242 is set on the second side of the main body 241 and protrudes from the second side of the main body 241.

[0100] The mating surface 2421 of the protruding portion 242 is a surface that can form a mating relationship with other components, wall surfaces, etc. The shape of the mating surface 2421 is not fixed, and it can be a plane or an arc surface. When the mating surface 2421 is mated with the hole wall of the pressure relief hole 212, it can form a mating relationship with the hole wall of the pressure relief hole 212. The mating relationship can be a contact fit, for example, the mating surface 2421 and the hole wall of the pressure relief hole 212 are against each other, or it can be a clearance fit, for example, there is a certain mating gap between the mating surface 2421 and the hole wall of the pressure relief hole 212. However, no matter which of the above-mentioned mating relationships is used, the mating surface 2421 and the hole wall of the pressure relief hole 212 will be constrained by the mating relationship.

[0101] Thus, when the pressure relief mechanism 24 is installed in the pressure relief hole 212, since the protruding portion 242 is provided on the outer periphery of the main body 241 having the pressure relief function, it does not affect the pressure relief. Moreover, the protruding portion 242 protrudes from the main body 241 along the thickness direction of the pressure relief mechanism 24 and has at least one mating surface 2421 that mates with the wall of the pressure relief hole 212. Therefore, the mating of the protruding portion 242 and the pressure relief hole 212 can achieve foolproofing, allowing the pressure relief mechanism 24 to be installed in the correct direction, thereby ensuring the correct pressure relief direction of the pressure relief mechanism 24 and improving the reliability of the battery cell 20. In addition, since the protruding portion 242 has the mating surface 2421 that mates with the wall of the pressure relief hole 212, the assembly accuracy and reliability of the pressure relief mechanism 24 relative to the end cap 21 are also improved.

[0102] See Figure 8 According to some embodiments of the present application, along the radial direction of the pressure relief hole 212 , at least one mating surface 2421 of the protruding portion 242 abuts against the hole wall of the pressure relief hole 212 .

[0103] The radial direction of the pressure relief hole 212 refers to a direction perpendicular to the axial direction of the pressure relief hole 212. The axial direction of the pressure relief hole 212 is parallel to the thickness direction of the pressure relief mechanism 24.

[0104] Along the radial direction of the pressure relief hole 212, at least one mating surface 2421 of the protrusion 242 abuts against the hole wall of the pressure relief hole 212, which means that the protrusion 242 can be restricted by the hole wall of the pressure relief hole 212 along the radial direction of the pressure relief hole 212, so that the protrusion 242 cannot move relative to the pressure relief hole 212 in the radial direction of the pressure relief hole 212, thereby confirming the positional relationship between the two. Specifically, the mating surface 2421 can be a portion of the outer wall of the protrusion 242 abutting against the hole wall of the pressure relief hole 212 along the radial direction of the pressure relief hole 212, or the mating surface 2421 can be a portion of the inner wall of the protrusion 242 abutting against the hole wall of the pressure relief hole 212 along the radial direction of the pressure relief hole 212. For example, a groove structure is formed on the protrusion 242, and the inner wall of the groove structure abuts against the protrusion in the hole wall of the pressure relief hole 212. Of course, the matching surface 2421 is provided by a method in which a portion of the outer wall of the protruding portion 242 abuts against the hole wall of the pressure relief hole 212 , which can simplify the structure of the protruding portion 242 and the pressure relief hole 212 and reduce the difficulty of assembly.

[0105] Since the mating surface 2421 of the protruding portion 242 abuts against the hole wall of the pressure relief hole 212 along the radial direction of the pressure relief hole 212, the mating surface 2421 of the protruding portion 242 can be matched with the hole wall of the pressure relief hole 212, thereby achieving a fool-proof effect, enabling the pressure relief mechanism 24 to be installed in the positive direction, and improving the reliability of the battery cell 20.

[0106] In addition, since the pressure relief mechanism 24 is usually installed along the axial direction of the pressure relief hole 212, the radial direction cooperation is easier to distinguish from the axial direction installation positioning of the pressure relief mechanism 24 than the axial direction cooperation, is easier to identify, and has a better anti-mistake effect.

[0107] According to some embodiments of the present application, the mating surface 2421 of the protruding portion 242 includes a first mating surface 2422 and a second mating surface 2423 , and the first mating surface 2422 and the second mating surface 2423 are arranged to intersect.

[0108] The intersection of the first mating surface 2422 and the second mating surface 2423 means that there is an angle between the first mating surface 2422 and the second mating surface 2423, and a common boundary line is formed in space. The angle between the first mating surface 2422 and the second mating surface 2423 can be 90 degrees, or other angles greater than 90 degrees. It should be noted that when the angle between the first mating surface 2422 and the second mating surface 2423 is less than 90 degrees, it may affect the installation of the pressure relief mechanism 24 relative to the pressure relief hole 212.

[0109] By intersecting the first mating surface 2422 and the second mating surface 2423 of the protruding portion 242, a fit can be formed with the hole wall of the pressure relief hole 212 in two intersecting directions, making the fitting relationship between the protruding portion 242 and the pressure relief hole 212 tighter, improving the fitting accuracy, and thus improving the anti-mistake effect.

[0110] Specifically, along the radial direction of the pressure relief hole 212 , the first mating surface 2422 abuts against the hole wall of the pressure relief hole 212 , and along the axial direction of the pressure relief hole 212 , the second mating surface 2423 abuts against the hole wall of the pressure relief hole 212 .

[0111] Along the axial direction of the pressure relief hole 212, the second mating surface 2423 of the protruding portion 242 abuts against the hole wall of the pressure relief hole 212, meaning that the protruding portion 242 can be restricted by the hole wall of the pressure relief hole 212 along the axial direction of the pressure relief hole 212, so that the protruding portion 242 cannot move relative to the pressure relief hole 212 in the axial direction of the pressure relief hole 212, thereby confirming the positional relationship between the two. Specifically, the second mating surface 2423 can be a portion of the outer wall of the protruding portion 242 abutting against the hole wall of the pressure relief hole 212 along the axial direction of the pressure relief hole 212, or the second mating surface 2423 can be a portion of the inner wall of the protruding portion 242 abutting against the hole wall of the pressure relief hole 212 along the axial direction of the pressure relief hole 212.

[0112] The matching method of making the first matching surface 2422 and the second matching surface 2423 respectively abut against the hole wall of the pressure relief hole 212 along the radial direction and the axial direction of the pressure relief hole 212 is simpler and the matching relationship is more reliable, thereby improving the anti-fouling reliability.

[0113] Furthermore, the pressure relief hole 212 includes a main hole 2121 and a positioning groove 2122. The positioning groove 2122 surrounds the main hole 2121 and is connected to the main hole 2121 along the axial direction of the pressure relief hole 212 to form a first stepped hole. Along the axial direction of the pressure relief hole 212, the projection of the main body 241 toward the pressure relief hole 212 at least partially falls into the main hole 2121. Along the radial direction of the pressure relief hole 212, the first mating surface 2422 abuts against the sidewalls of the positioning groove 2122. Along the axial direction of the pressure relief hole 212, the second mating surface 2423 abuts against the bottom wall of the positioning groove 2122.

[0114] The main hole 2121 is the main channel for the pressure relief mechanism 24 to release pressure, that is, to release the pressure or temperature inside the battery cell 20 .

[0115] The positioning groove 2122 is a groove used to position the protruding portion 242 of the pressure relief mechanism 24. The positioning groove 2122 can be located at one end of the main hole 2121 along the axial direction. For example, when the pressure relief mechanism 24 is installed at the bottom of the pressure relief hole 212, the positioning groove 2122 is located at the end of the main hole 2121 facing the accommodating cavity. When the pressure relief mechanism 24 is installed at the top of the pressure relief hole 212, the positioning groove 2122 is located at the end of the main hole 2121 facing away from the accommodating cavity.

[0116] By forming a first step hole in the pressure relief hole 212 through the main hole 2121 and the positioning groove 2122, on the one hand, the pressure relief of the main body 241 is not affected, and on the other hand, the protruding portion 242 and the positioning groove 2122 can be reliably abutted, which simplifies the positioning method of the protruding portion 242 relative to the pressure relief hole 212, improves the positioning reliability, and achieves a better anti-fouling effect.

[0117] Furthermore, along the radial direction of the pressure relief hole 212 , a portion of the second matching surface 2423 protrudes into the main hole 2121 .

[0118] When along the radial direction of the pressure relief hole 212, part of the second mating surface 2423 protrudes from the main hole 2121, so that part of the protruding portion 242 is located in the positioning groove 2122, and the other part of the protruding portion 242 can protrude inward into the main hole 2121, thereby providing a certain margin for the positioning fit of the protruding portion 242 and the positioning groove 2122. The size of the protruding portion 242 along the radial direction of the pressure relief hole 212 is also wider, and the structure of the protruding portion 242 is also more reliable, thereby improving the reliability of the positioning fit as a whole.

[0119] See Figure 5 According to some embodiments of the present application, the protruding portion 242 is arranged in a complete circle around the outer circumference of the main body 241.

[0120] When the protrusion 242 is arranged in a full circle, the protrusion 242 can be circumferentially matched with the pressure relief hole 212, thereby making the positioning reliability of the protrusion 242 relative to the pressure relief hole 212 higher, and the two are matched more closely, thereby improving the anti-fouling effect and further improving the assembly accuracy and reliability of the pressure relief mechanism 24 relative to the end cover 21.

[0121] In other embodiments, the protrusion 242 includes a plurality of sub-protrusions, each of which protrudes from the main body 241 along the thickness direction of the pressure relief mechanism 24 , and all the sub-protrusions surround the outer circumference of the main body 241 and are spaced apart from each other.

[0122] When the protrusion 242 is divided into a plurality of sub-protrusions, and the plurality of sub-protrusions are arranged at intervals around the outer circumference of the main body 241, they can also be circumferentially matched with the pressure relief hole 212, thereby making the positioning reliability of the protrusion 242 and the pressure relief hole 212 higher, and the two cooperate more closely, thereby improving the foolproof effect and further improving the assembly accuracy and reliability of the pressure relief mechanism 24 relative to the end cover 21.

[0123] Specifically, when the protrusion 242 includes a plurality of sub-protrusions, at least two sub-protrusions are spaced apart relative to the center of the pressure relief mechanism 24 along the length direction of the pressure relief mechanism 24 .

[0124] The length direction of the pressure relief mechanism 24 can be the length direction of the end cover 21 of the present application, or the width direction of the end cover 21. Figure 7 Horizontal direction shown.

[0125] When at least two sub-protrusions are arranged relative to the center of the pressure relief mechanism 24 along the length direction of the pressure relief mechanism 24, the sub-protrusions on both sides of the length direction of the pressure relief mechanism 24 can form a positioning relationship with the pressure relief hole 212, which not only has a good anti-mistake effect, but also the assembly accuracy and reliability of the pressure relief mechanism 24 relative to the end cover 21 are high.

[0126] In other embodiments, when the protrusion 242 includes a plurality of sub-protrusions, at least two sub-protrusions are spaced apart relative to the center of the pressure relief mechanism 24 along the width direction of the pressure relief mechanism 24 .

[0127] When at least two sub-protrusions are arranged at intervals relative to the center of the pressure relief mechanism 24 along the width direction of the pressure relief mechanism 24, the sub-protrusions on both sides of the width direction of the pressure relief mechanism 24 can form a positioning relationship with the pressure relief hole 212, which not only has a good anti-mistake effect, but also the assembly accuracy and reliability of the pressure relief mechanism 24 relative to the end cover 21 are high.

[0128] In other embodiments, when the protrusion 242 includes multiple sub-protrusions, at least two sub-protrusions are spaced relative to the center of the pressure relief mechanism 24 along the length direction of the pressure relief mechanism 24, and at least two sub-protrusions are spaced relative to the center of the pressure relief mechanism 24 along the width direction of the pressure relief mechanism 24.

[0129] Combine Figure 5 and Figure 8 According to some embodiments of the present application, the pressure relief mechanism 24 further includes a connecting portion 243 . The connecting portion 243 is annular and is disposed on the outer periphery of the protruding portion 242 . The connecting portion 243 is connected to the end cover 21 .

[0130] The connecting portion 243 is a portion of the pressure relief mechanism 24 that forms a connection relationship with an external component. Specifically, the connecting portion 243 can be connected to the end cover 21 by welding, bonding, or the like.

[0131] Since the connecting portion 243 is arranged on the outer periphery of the protruding portion 242, that is, the protruding portion 242 is arranged on the inner side of the connecting portion 243, the setting of the protruding portion 242 will not affect the connection setting between the connecting portion 243 and the end cover 21. Therefore, on the one hand, the anti-fouling reliability is improved, and on the other hand, the connection reliability of the pressure relief mechanism 24 and the end cover 21 is improved.

[0132] Specifically, the size of the connecting portion 243 is 1 mm to 3 mm along the thickness direction perpendicular to the pressure relief mechanism 24. When the size of the connecting portion 243 is 1 mm to 3 mm, the connection between the connecting portion 243 and the end cover 21 can be reliable.

[0133] According to some embodiments of the present application, when the pressure relief hole 212 includes a main hole 2121 and a positioning groove 2122, the pressure relief hole 212 also includes a connecting groove 2123, and the connecting groove 2123 surrounds the positioning groove 2122. Along the axial direction of the pressure relief hole 212, the connecting groove 2123 is connected to the positioning groove 2122 to form a second step hole. Along the radial direction of the pressure relief hole 212, the connecting portion 243 is against the side wall of the connecting groove 2123, and along the axial direction of the pressure relief hole 212, the connecting portion 243 is against the bottom wall of the connecting groove 2123.

[0134] In this way, the connecting portion 243 can also be limited by the connecting groove 2123 and positioned in the pressure relief hole 212, and can also cooperate with the protruding portion 242 to jointly improve the assembly accuracy of the pressure relief mechanism 24. In addition, since the connecting portion 243 is positioned in the pressure relief hole 212, the connection between the connecting portion 243 and the end cover 21 is also more reliable.

[0135] See Figure 9 According to other embodiments of the present application, the pressure relief mechanism 24 further includes a connecting portion 243. The connecting portion 243 is annular and is disposed on the outer periphery of the protruding portion 242. The connecting portion 243 is connected to the end cover 21. The pressure relief hole 212 includes a main hole 2121 and a connecting groove 2123. The connecting groove 2123 surrounds the main hole 2121 and is connected to the main hole 2121 along the axial direction of the pressure relief hole 212 to form a third stepped hole. Along the axial direction of the pressure relief hole 212, the projection of the main body 241 toward the pressure relief hole 212 at least partially falls into the main hole 2121. Along the radial direction of the pressure relief hole 212, at least one mating surface 2421 of the protruding portion 242 abuts against the sidewall of the main hole 2121, the connecting portion 243 abuts against the sidewall of the connecting groove 2123, and along the axial direction of the pressure relief hole 212, the connecting portion 243 abuts against the bottom wall of the connecting groove 2123.

[0136] By forming a third stepped hole in the pressure relief hole 212 through the cooperation of the main hole 2121 and the connecting groove 2123, the protruding portion 242 and the pressure relief hole 212 can be reliably abutted against the inner wall of the main hole 2121, and the connecting portion 243 can also be positioned in the pressure relief hole 212 due to the restriction of the connecting groove 2123, and can also cooperate with the protruding portion 242 to jointly improve the assembly accuracy of the pressure relief mechanism 24. In addition, since the connecting portion 243 is positioned in the pressure relief hole 212, the connection between the connecting portion 243 and the end cover 21 is also more reliable.

[0137] According to some embodiments of the present application, along the thickness direction of the pressure relief mechanism 24 , a protruding height H of the protruding portion 242 protruding from the main body 241 is 0.2 mm to 1 mm.

[0138] When the protruding height H of the protruding portion 242 protruding from the main body 241 is 0.2 mm to 1 mm, the protruding portion 242 protrudes more obviously than the main body 241, and the area of ​​the protruding portion 242 against the pressure relief hole 212 is large, which can form a more reliable positioning and matching relationship with the pressure relief hole 212, thereby improving the anti-fouling effect.

[0139] According to some embodiments of the present application, the main body 241 includes a pressure relief portion 2411 . Along the thickness direction of the pressure relief mechanism 24 , the thickness of the pressure relief portion 2411 is smaller than the thickness of the rest of the main body 241 .

[0140] Since the thickness of the pressure relief portion 2411 is smaller than the thickness of the rest of the main body 241 , the pressure relief portion 2411 , as a weak structure, can be destroyed when the internal pressure or temperature of the battery cell 20 reaches a threshold value to form an opening or channel for releasing the internal pressure or temperature.

[0141] In addition, when installing the pressure relief mechanism 24 to the end cover 21, the thickness of the pressure relief portion 2411 is less than the thickness of the rest of the main body 241, which is not easy to be identified by the operator or the automated equipment. Therefore, it is easy to install the pressure relief mechanism 24 in reverse. The present application provides a protruding portion 242 on the outer periphery of the pressure relief portion 2411, which can improve the anti-foolproof effect and reduce the risk of reverse installation of the pressure relief mechanism 24.

[0142] Furthermore, the pressure relief portion 2411 is configured as a notched groove provided on the main body 241 .

[0143] The notched groove is a groove structure formed on the main body 241. The method of forming the pressure relief portion 2411 by providing the notched groove is simple, and the notched groove is usually relatively small and difficult to be identified by operators or automated equipment. Therefore, it is easy to install the pressure relief mechanism 24 in reverse. The present application provides a protruding portion 242 on the outer periphery of the notched groove to improve the foolproof effect and reduce the risk of reverse installation of the pressure relief mechanism 24.

[0144] Specifically, along the thickness direction of the pressure relief mechanism 24 , the depth L of the notched groove is 0.04 mm to 0.16 mm.

[0145] When the depth L of the notch groove is 0.04 mm to 0.16 mm, the depth L of the notch groove is relatively shallow and is more difficult to be identified by an operator or automated equipment.

[0146] According to some embodiments of the present application, along the thickness direction of the end cap 21, the end cap 21 has a first surface 213 and a second surface 214 disposed opposite each other. The second surface 214 is disposed closer to the accommodating cavity than the first surface 213. The pressure relief hole 212 extends from the first surface 213 to the second surface 214. The pressure relief hole 212 forms a pressure relief port on the second surface 214. The pressure relief mechanism 24 is mounted at the pressure relief port. The main body 241 includes a pressure relief portion 2411 disposed toward the first surface 213. The protruding portion 242 protrudes from the main body 241 toward the first surface 213.

[0147] When the pressure relief port is formed on the second surface 214, that is, the position of the bottom of the pressure relief hole 212, when the pressure relief mechanism 24 is installed from the pressure relief port to the pressure relief hole 212, the pressure relief portion 2411 is arranged to be installed in a positive direction toward the first surface 213. Therefore, by arranging the protruding portion 242 to protrude from the main body 241 toward the first surface 213, the protruding portion 242 can form a positioning and matching relationship with the pressure relief hole 212, thereby achieving an anti-foolproof effect.

[0148] In other embodiments, the pressure relief hole 212 forms a pressure relief port on the first surface 213, the pressure relief mechanism 24 is installed at the pressure relief port, the main body 241 includes a pressure relief portion 2411, the pressure relief portion 2411 is arranged to face away from the second surface 214, and the protruding portion 242 protrudes from the main body 241 toward the second surface 214.

[0149] When the pressure relief port is formed on the first surface 213, that is, the top position of the pressure relief hole 212, when the pressure relief mechanism 24 is installed from the pressure relief port to the pressure relief hole 212, the pressure relief portion 2411 is arranged to be installed in a forward direction with its back to the second surface 214. Therefore, by arranging the protruding portion 242 to protrude from the main body 241 toward the second surface 214, the protruding portion 242 can form a positioning and matching relationship with the pressure relief hole 212, thereby achieving an anti-foolproof effect.

[0150] According to some embodiments of the present application, referring to Figures 1 to 6 , provides a battery device 100, including the battery cell 20 in any of the above embodiments.

[0151] In the battery device 100 of the present embodiment, when the pressure relief mechanism 24 is installed in the pressure relief hole 212, the protruding portion 242 is disposed on the outer periphery of the main body 241, which has a pressure relief function, and thus does not affect the pressure relief. Furthermore, the protruding portion 242 protrudes from the main body 241 along the thickness direction of the pressure relief mechanism 24 and has at least one mating surface 2421 that mates with the wall of the pressure relief hole 212. Therefore, the mating surface 2421 of the protruding portion 242 and the pressure relief hole 212 ensures foolproof installation, enabling the pressure relief mechanism 24 to be installed in the correct direction. This ensures the pressure relief mechanism 24 releases pressure in the correct direction, thereby improving the reliability of the battery cell 20. Furthermore, the mating surface 2421 of the protruding portion 242 mates with the wall of the pressure relief hole 212, thereby improving the assembly accuracy and reliability of the pressure relief mechanism 24 relative to the end cap 21.

[0152] In addition, an embodiment of the present application further provides an electrical device, comprising the battery device 100 in any of the above embodiments.

[0153] In the electrical device of the embodiment of the present application, when the pressure relief mechanism 24 is installed in the pressure relief hole 212, since the protruding portion 242 is provided on the outer periphery of the main body 241 having the pressure relief function, it will not affect the pressure relief. Moreover, the protruding portion 242 protrudes from the main body 241 along the thickness direction of the pressure relief mechanism 24 and has at least one mating surface 2421 that mates with the hole wall of the pressure relief hole 212. Therefore, the mating of the protruding portion 242 and the pressure relief hole 212 can achieve foolproofing, allowing the pressure relief mechanism 24 to be installed in the correct direction, thereby ensuring the correct pressure relief direction of the pressure relief mechanism 24 and improving the reliability of the battery cell 20. In addition, since the protruding portion 242 has a mating surface 2421 that mates with the hole wall of the pressure relief hole 212, the assembly accuracy and reliability of the pressure relief mechanism 24 relative to the end cover 21 are also improved.

[0154] 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 battery cell, characterized in that: include: a housing having an opening on one side; An end cover is provided at the opening and is enclosed with the shell to form a receiving cavity, and a pressure relief hole is provided on the end cover; an electrode assembly, disposed in the accommodating cavity; and A pressure relief mechanism is installed in the pressure relief hole. The pressure relief mechanism includes a main body with a pressure relief function and a protruding portion. The protruding portion is arranged on the outer periphery of the main body and protrudes from the main body along the thickness direction of the pressure relief mechanism; the protruding portion has at least one mating surface, and each of the mating surfaces is mated with the hole wall of the pressure relief hole.

2. The battery cell according to claim 1, wherein: Along the radial direction of the pressure relief hole, at least one matching surface of the protruding portion abuts against the hole wall of the pressure relief hole.

3. The battery cell according to claim 1, wherein: The mating surface of the protruding portion includes a first mating surface and a second mating surface, and the first mating surface and the second mating surface are arranged to intersect with each other.

4. The battery cell according to claim 3, characterized in that Along the radial direction of the pressure relief hole, the first matching surface abuts against the hole wall of the pressure relief hole; along the axial direction of the pressure relief hole, the second matching surface abuts against the hole wall of the pressure relief hole.

5. The battery cell according to claim 4, characterized in that The pressure relief hole includes a main hole and a positioning groove, the positioning groove surrounds the main hole and is connected to the main hole along the axial direction of the pressure relief hole to form a first stepped hole, and along the axial direction of the pressure relief hole, the projection of the main body toward the pressure relief hole at least partially falls into the main hole; Along the radial direction of the pressure relief hole, the first matching surface abuts against the groove side wall of the positioning groove, and along the axial direction of the pressure relief hole, the second matching surface abuts against the groove bottom wall of the positioning groove.

6. The battery cell according to claim 5, characterized in that Along the radial direction of the pressure relief hole, a portion of the second matching surface protrudes into the main hole.

7. The battery cell according to claim 1, characterized in that The protruding portion is arranged in a complete circle around the outer circumference of the main body; or The protruding portion includes a plurality of sub-protruding portions, each of which protrudes from the main body along the thickness direction of the pressure relief mechanism, and all of the sub-protruding portions surround the outer circumference of the main body and are spaced apart from each other.

8. The battery cell according to claim 7, characterized in that When the protrusion includes a plurality of sub-protrusions, at least two of the sub-protrusions are spaced relative to the center of the pressure relief mechanism along the length direction of the pressure relief mechanism; and / or At least two of the protruding portions are spaced apart relative to the center of the pressure relief mechanism along the width direction of the pressure relief mechanism.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The pressure relief mechanism further includes a connecting portion, which is annular and disposed on the outer periphery of the protruding portion, and is connected to the end cover.

10. The battery cell according to claim 9, characterized in that When the pressure relief hole includes a main hole and a positioning groove, the pressure relief hole further includes a connecting groove, the connecting groove surrounds the positioning groove, and along the axial direction of the pressure relief hole, the connecting groove is connected to the positioning groove to form a second step hole; Along the radial direction of the pressure relief hole, the connecting portion abuts against the groove side wall of the connecting groove, and along the axial direction of the pressure relief hole, the connecting portion abuts against the groove bottom wall of the connecting groove.

11. The battery cell according to any one of claims 2, 7 or 8, characterized in that: The pressure relief mechanism further includes a connecting portion, which is annular and disposed on the outer periphery of the protruding portion, and is connected to the end cover; The pressure relief hole includes a main hole and a connecting groove, the connecting groove surrounds the main hole and is connected to the main hole along the axial direction of the pressure relief hole to form a third stepped hole, and along the axial direction of the pressure relief hole, the projection of the main body toward the pressure relief hole at least partially falls into the main hole; Along the radial direction of the pressure relief hole, at least one mating surface of the protruding portion abuts against the groove side wall of the main hole, the connecting portion abuts against the groove side wall of the connecting groove, and along the axial direction of the pressure relief hole, the connecting portion abuts against the groove bottom wall of the connecting groove.

12. The battery cell according to any one of claims 1 to 8, characterized in that: Along the thickness direction of the pressure relief mechanism, the protruding height of the protruding portion is 0.2 mm to 1 mm.

13. The battery cell according to any one of claims 1 to 8, characterized in that: The main body includes a pressure relief portion. Along the thickness direction of the pressure relief mechanism, the thickness of the pressure relief portion is smaller than the thickness of the remaining portion of the main body.

14. The battery cell according to claim 13, characterized in that The pressure relief portion is configured as a scored groove provided on the main body portion.

15. The battery cell according to claim 14, characterized in that Along the thickness direction of the pressure relief mechanism, the depth of the notched groove is 0.04 mm to 0.16 mm.

16. The battery cell according to any one of claims 1 to 8, characterized in that: Along the thickness direction of the end cover, the end cover has a first surface and a second surface arranged opposite to each other, the second surface is arranged closer to the accommodating cavity than the first surface, and the pressure relief hole extends from the first surface to the second surface; wherein the pressure relief hole forms a pressure relief port on the second surface, the pressure relief mechanism is installed at the pressure relief port, the main body includes a pressure relief portion, the pressure relief portion is arranged toward the first surface, and the protruding portion protrudes from the main body toward the first surface; or The pressure relief hole forms a pressure relief port on the first surface, the pressure relief mechanism is installed at the pressure relief port, the main body includes a pressure relief portion, the pressure relief portion is arranged to face away from the second surface, and the protruding portion protrudes from the main body toward the second surface.

17. A battery device, characterized in that: Comprising the battery cell according to any one of claims 1 to 16.

18. An electrical device, characterized in that: Comprising the battery device of claim 17.

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