A battery cell, a battery device, and an electric device

Abstract

The utility model relates to battery technology field provides a kind of battery monomer, battery device and electric device.Battery monomer includes electrode assembly and shell, and electrode assembly is housed in shell.The shell includes wall part, pressure relief mechanism and reinforcing rib structure.Opening is equipped on wall part;Pressure relief mechanism is installed to wall part and covers opening;Reinforcing rib structure is set up corresponding opening, and is connected to wall part, and the projection area of reinforcing rib structure in first direction is less than the area of opening, along first direction, reinforcing rib structure is set between pressure relief mechanism and electrode assembly.Such setting, it can improve the structural rigidity of opening area, prevent pressure relief mechanism from being misopened due to shell deformation;While the projection area of reinforcing rib structure in first direction is less than the area of opening, reserve the flow path for gas discharge, improve the smoothness of pressure relief exhaust, give consideration to rigidity reinforcement and pressure relief function, reduce the risk of pressure relief mechanism misopening.

Description

Technical Field

[0001] This specification relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] With the rapid development of new energy vehicles, power battery devices face more complex and severe mechanical load conditions during operation, such as external energy impact events like vehicle collisions, chassis bottoming out, and module extrusion. Under these conditions, the risk of deformation in the shell opening area increases dramatically, easily inducing abnormal opening or sealing failure of the pressure relief mechanism (such as the explosion-proof valve), leading to premature pressure release, insulation failure, or even thermal runaway of the battery system, seriously threatening the safety of the entire vehicle. Therefore, how to effectively improve the structural rigidity of the shell opening area to resist local deformation caused by external loads while ensuring the normal pressure relief function of the explosion-proof valve, and ensuring the reliability of the connection between the explosion-proof valve plate and the shell, thereby preventing accidental opening of the explosion-proof valve and damage to the sealing interface, is a technical problem that this field continues to pursue and needs to solve.

[0003] To address the aforementioned issues, it is desirable to provide a battery cell, a battery device, and an electrical device. Utility Model Content

[0004] This specification provides one or more embodiments of a battery cell, including an electrode assembly and a housing, the electrode assembly being housed within the housing; the housing includes: a wall portion having an opening; a pressure relief mechanism mounted on the wall portion and covering the opening; and a reinforcing rib structure disposed corresponding to the opening and connected to the wall portion, wherein the projected area of ​​the reinforcing rib structure in a first direction is smaller than the area of ​​the opening. Along the first direction, the reinforcing rib structure is disposed between the pressure relief mechanism and the electrode assembly.

[0005] By setting the reinforcing ribs corresponding to the openings, the structural rigidity of the opening area can be improved, preventing the pressure relief mechanism from accidentally opening due to shell deformation. Simultaneously, the projected area of ​​the reinforcing ribs in the first direction is smaller than the area of ​​the opening, reserving a flow path for gas discharge, thereby improving the smoothness of pressure relief and venting, thus balancing rigidity reinforcement and pressure relief functions. Through these settings, the reinforcing ribs can not only bear external compressive loads and suppress the transmission of opening deformation to the pressure relief mechanism, but also act as a rigid barrier between the electrode assembly and the pressure relief mechanism, preventing the electrode assembly from expanding and surging during thermal runaway and rupturing the pressure relief mechanism. Therefore, under both external compressive and internal thermal runaway conditions, the risk of accidental opening of the pressure relief mechanism is effectively reduced, improving the safety performance of the battery device.

[0006] In some embodiments, the reinforcing rib structure is integrally formed with the wall.

[0007] The one-piece molded structure increases the rigidity of the shell and prevents the pressure relief mechanism from opening accidentally; the reinforcing rib structure is integrally molded with the wall, eliminating the need for additional parts and assembly processes, reducing the accumulation of connection tolerances, which helps to improve structural accuracy and connection reliability, while reducing manufacturing costs.

[0008] In some embodiments, a gap exists between the pressure relief mechanism and the reinforcing rib structure in the first direction.

[0009] When the shell is subjected to external pressure or vibration impact, the reinforcing rib structure bears and disperses the deformation stress, and the gap ensures that the stress is not directly transmitted to the pressure relief mechanism, reducing the risk of the pressure relief mechanism being opened accidentally due to shell deformation.

[0010] In some embodiments, the gap is in the range of 0.1 mm to 3 mm.

[0011] This clearance range serves the dual functions of "stress isolation" and "effective support under load," which helps improve the structural integrity and opening reliability of the pressure relief mechanism under all operating conditions.

[0012] In some embodiments, the reinforcing rib structure further includes an annular structure disposed circumferentially along the opening.

[0013] By setting the reinforcing ribs around the opening, the opening edge receives stiffness compensation at all positions in the circumferential direction, reducing the risk of weak points formed due to uneven local reinforcement. Thus, when the wall is subjected to external loads, the deformation of the opening edge can be uniformly constrained, preventing stress concentration in a certain area from being transmitted to the pressure relief mechanism. This helps improve the flatness of the pressure relief mechanism's mounting surface and the reliability of the sealing interface, reducing the risk of stress concentration or accidental opening of the pressure relief mechanism due to local warping.

[0014] In some embodiments, the ratio of the total area of ​​the reinforcing rib structure projected in the first direction to the area of ​​the opening is in the range of 30%-60%.

[0015] By controlling the ratio of the total area of ​​the reinforcing rib structure projected in the first direction to the area of ​​the opening to 30% to 60%, an effective load transfer network can be formed to distribute external loads, and the gaps between the ribs can have sufficient ventilation area to allow gas to flow, thus taking into account both structural reinforcement and pressure relief functions.

[0016] In some embodiments, the reinforcing rib structure includes at least one first rib and at least one second rib, the first rib extending along a second direction and the second rib extending along a third direction, the second direction and the third direction intersecting each other and both perpendicular to the first direction.

[0017] By employing a cross-grid reinforcing rib structure, external loads can be evenly distributed in multiple directions, reducing the risk of stress concentration in localized areas of the opening and suppressing deformation at the opening edges. Simultaneously, the grid gaps form gas flow channels, allowing gas generated by the electrode assembly during thermal runaway to flow smoothly to the pressure relief mechanism, ensuring timely and reliable pressure relief. Thus, the cross-grid structure balances the need for stiffness reinforcement in the opening area with the requirement for unobstructed pressure relief channels.

[0018] In some embodiments, the reinforcing rib structure includes a plurality of parallel and spaced-apart ribs.

[0019] By arranging multiple ribs in parallel intervals, extending in the same direction, the structure is regular and the layout is simple. This facilitates integral forming with the wall using stamping processes, simplifying the mold structure, reducing mold manufacturing costs, and improving the yield rate of stamping. Simultaneously, the arrangement of multiple parallel ribs along a specific direction (such as a second or third direction) provides directional stiffness compensation in a direction perpendicular to the rib extension direction. This is suitable for applications with specific requirements for stiffness in a particular direction, achieving precise directional reinforcement.

[0020] In some embodiments, the thickness of the reinforcing rib structure along the first direction is less than the thickness of the wall portion along the first direction.

[0021] By setting the reinforcing rib structure to a thin structure, the structural stiffness of the opening area can be significantly improved while reducing the material volume and mass of the reinforcing rib structure itself. This helps to reduce the overall weight of the battery cell and meet the lightweight requirements of the battery device.

[0022] In some embodiments, the housing includes a body and a top cover, the top cover being connected to the open end of the body, and the wall portion being the top cover.

[0023] The top cover is placed on top of the battery cell. When the pressure relief mechanism is opened on the top cover, high-temperature gas and electrolyte are ejected upwards, which helps to quickly move away from the surrounding battery cells below and to the sides, reducing the risk of heat diffusion.

[0024] This specification provides a battery device according to one or more embodiments. The battery device includes a plurality of battery cells as described in any of the above embodiments.

[0025] This specification provides an electrical device according to one or more embodiments. The electrical device includes a single battery cell or battery device as described in any of the above embodiments. Attached Figure Description

[0026] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0027] Figure 1 These are schematic diagrams of the vehicle structure shown in some embodiments of this specification; Figure 2 This is an exploded structural diagram of a battery device according to some embodiments of this specification; Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this specification; Figure 4 This is a partial sectional view of the wall portion excluding the reinforcing rib structure, as shown in some embodiments of this specification; Figure 5A This is a partial sectional view of a wall portion including a reinforcing rib structure, as shown in some embodiments of this specification; Figure 5B This is a top view of a wall portion including a reinforcing rib structure, as shown in some embodiments of this specification; Figure 6 This is a top view of the pressure relief mechanism installed on the wall according to some embodiments of this specification; Figure 7 This is an exploded view of a pressure relief mechanism installed on a wall according to some embodiments of this specification; Figure 8 yes Figure 6 A cross-sectional view of region A in the middle.

[0028] Explanation of reference numerals in the attached figures: 1. Vehicle; 10. Battery unit; 100. Battery cell; 110. Electrode assembly; 120. Housing; 121. Wall; 1211. Opening; 122. Shell body; 123. Reinforcing rib structure; 1231. Rib; 12311. First rib; 12312. Second rib; 12313. Frame; 130. Pressure relief mechanism; 200. Housing; 210. First housing; 220. Second housing; 20. Controller; 30. Motor. Detailed Implementation

[0029] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0030] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of this specification, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this specification according to the specific circumstances.

[0033] In the embodiments described in this specification, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of the various components shown in the embodiments of this specification are merely illustrative and should not constitute any limitation on this specification.

[0034] During cell assembly, transportation, or use, when the casing is subjected to external pressure, vibration, or impact, the opening area of ​​the pressure relief mechanism (such as an explosion-proof valve) is prone to plastic deformation or warping due to a significant reduction in local stiffness. This deformation is directly transmitted to the mounting surface of the explosion-proof valve plate, causing stress concentration or warping of the valve plate, which can easily lead to accidental opening of the explosion-proof valve; on the other hand, it may damage the welded or bonded sealing interface between the explosion-proof valve plate and the casing, causing slow leakage and other problems. To solve the above problems, this specification proposes a battery cell, a battery device, and an electrical device.

[0035] The battery devices and related technologies disclosed in the embodiments of this specification can be applied to electrical devices including but not limited to vehicles, ships, or aircraft. For ease of explanation, the following embodiments use a vehicle (1) as an example of an electrical device.

[0036] Figure 1 These are schematic diagrams of the vehicle structure according to some embodiments of this specification. For example... Figure 1As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and the battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 is mounted on vehicle 1 and can supply power to vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to supply power to the motor 30, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0037] In some embodiments, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0038] Figure 2 This is an exploded structural diagram of a battery device according to some embodiments of this specification.

[0039] In some embodiments, such as Figure 2 As shown, the battery device 10 includes a housing 200 and a plurality of battery cells 100.

[0040] The battery cell 100 is the basic energy storage unit in the battery device 10 for the mutual conversion of chemical energy and electrical energy.

[0041] In the battery device 10, there can be multiple battery cells 100, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 100 is housed within the housing 200. Alternatively, the battery device 10 can also consist of multiple battery cells 100 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 200. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 100.

[0042] In some embodiments, each battery cell 100 can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0043] In some embodiments, each battery cell 100 may also be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0044] The housing 200 includes a receiving cavity. Multiple battery cells 100 are received within the receiving cavity. The housing 200 can adopt various structures. In some embodiments, the housing 200 may include a first housing 210 and a second housing 220, the first housing 210 and the second housing 220 overlapping each other, the first housing 210 and the second housing 220 together defining a receiving cavity for receiving the battery cells 100. For example, the second housing 220 may be a hollow structure open at one end, and the first housing 210 may be a plate-like structure, the first housing 210 covering the open side of the second housing 220, so that the first housing 210 and the second housing 220 together define a receiving space. As another example, the first housing 210 and the second housing 220 may both be hollow structures open on one side, the open side of the first housing 210 covering the open side of the second housing 220.

[0045] For more information on individual battery cells, please refer to [link / reference]. Figures 3-8 The corresponding description.

[0046] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this specification. Figure 4 This is a partial sectional view of the wall portion excluding the reinforcing rib structure, as shown in some embodiments of this specification. Figure 5A Figure 5B is a partial sectional view of a wall portion including a reinforcing rib structure according to some embodiments of this specification. Figure 5B is a top view of a wall portion including a reinforcing rib structure according to some embodiments of this specification. In the figures, the "X" direction refers to the length direction of the battery cell 100; the "Y" direction refers to the width direction of the battery cell 100; and the "Z" direction refers to the thickness direction of the battery cell 100, also known as the gravity direction. The X, Y, and Z directions are perpendicular to each other.

[0047] In some embodiments, such as Figures 3-5B As shown, the battery cell 100 includes an electrode assembly 110 and a housing 120. The electrode assembly 110 is housed within the housing 120.

[0048] Electrode assembly 110 is a component in battery cell 100 where electrochemical reactions occur.

[0049] The housing 120 is an external component of the battery cell 100, used to house the electrode assembly 110. In some embodiments, the housing 120 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing 120 can be a sealed structure or a non-sealed structure. As an example, when the housing 120 is a non-sealed structure, the housing 120 includes a wall portion 121 and a body 122. The body 122 defines a receiving space for housing the electrode assembly 110 and has an opening at one end. The wall portion 121 connects to the opening of the body 122.

[0050] In some embodiments, the housing 122 is an integrally molded structure having a bottom and sidewalls, with one end away from the bottom forming an open end of the housing 122. The open end of the housing 122 refers to the port for inserting the electrode assembly 110, and the wall portion 121 (top cover) is sealed to the open end to close the internal accommodating space of the housing 122.

[0051] The wall portion 121 is one of the side walls of the housing 120. For example, when the opening of the housing 122 faces upward, the wall portion 121 covers the opening, and in this case, the wall portion 121 acts as a top cover. In some embodiments, the wall portion 121 is provided with an opening 1211 for installing a pressure relief mechanism.

[0052] A pressure relief mechanism is a structure used to release the internal gas of a battery cell 100. For example, a pressure relief mechanism may include an explosion-proof valve plate, a through-hole, etc.

[0053] As an example only, the internal pressure or temperature of the battery cell 100 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 100 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is damaged, thereby forming an opening or channel for the internal pressure or temperature to be released. The predetermined threshold design varies depending on the design requirements.

[0054] The term "actuation" as used in this specification refers to the pressure relief mechanism being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 100. The actions of the pressure relief mechanism may include, but are not limited to: movement of components within the pressure relief mechanism to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism. When the pressure relief mechanism is actuated, the high-temperature, high-pressure substances inside the battery cell are discharged as waste from the actuated portion. This method allows for pressure and temperature relief of the battery cell under controllable pressure or temperature, thereby reducing the risk of accidents.

[0055] The emissions from the battery cell 100 mentioned in this specification include, but are not limited to: electrolyte, dissolved or broken positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc. Further details regarding the pressure relief mechanism can be found in the following description.

[0056] In some embodiments of this specification, the top cover is disposed on the top of the battery cell, and the pressure relief mechanism is on the top cover. When the pressure relief mechanism is opened, high-temperature gas and electrolyte are sprayed out in an upward direction, which helps to quickly move away from the surrounding battery cells below and to the sides, reducing the risk of heat diffusion.

[0057] Opening 1211 is a through hole provided on the wall 121, serving as a mounting interface for the pressure relief mechanism. In some embodiments, such as Figure 3As shown, the opening 1211 penetrates the wall 121 along the thickness direction (i.e., the Z direction) of the wall 121.

[0058] In some embodiments, the shape of the opening 1211 includes, but is not limited to, a circle, an ellipse, a waist shape, a rectangle, a rounded rectangle, or a polygon.

[0059] In some embodiments, such as Figure 3 As shown, opening 1211 is an oblong orifice, comprising two oppositely arranged straight sections and two arc-shaped sections connecting the two ends of the straight sections. The structure of the oblong orifice matches the shape of conventional explosion-proof valve plates, facilitating the installation and sealing of the explosion-proof valve plates.

[0060] In some embodiments, the opening 1211 can be integrally formed with the wall portion 121; or it can be formed on the wall portion 121 by means of stamping, drilling, cutting, etc.

[0061] In some embodiments, the housing 120 includes a pressure relief mechanism 130 and a reinforcing rib structure 123. The pressure relief mechanism is mounted on the wall portion 121 and covers the opening 1211.

[0062] In some embodiments, the reinforcing rib structure 123 is disposed and connected to the wall portion 121 corresponding to the opening 1211, such as... Figure 3 , Figure 5A and Figure 5B As shown.

[0063] The reinforcing rib structure 123 refers to the component used to improve the structural rigidity of the opening 1211.

[0064] In some embodiments, the reinforcing rib structure 123 is a hollow structure consisting of at least one rib disposed inside the hollow frame 12313, such as... Figure 5A and Figure 5B As shown.

[0065] In some embodiments, the reinforcing rib structure 123 may be part of the wall portion 121 and integrally formed with the wall portion; or it may be a separate part that is connected to the wall portion 121 by means of adhesive, welding, riveting, etc.

[0066] In some embodiments, the reinforcing rib structure 123 is disposed corresponding to the opening 1211. "The reinforcing rib structure 123 is disposed corresponding to the opening 1211" means that the projection of the border 12313 of the reinforcing rib structure 123 onto the plane containing the opening 1211 along the first direction (i.e., the Z direction) at least partially overlaps with the opening 1211. For example, the projection of the border 12313 of the reinforcing rib structure 123 onto the plane containing the opening 1211 along the first direction completely overlaps with the opening 1211, in which case the area enclosed by the border 12313 of the reinforcing rib structure 123 is equal to the area corresponding to the opening 1211. As another example, the projection of the border 12313 of the reinforcing rib structure 123 onto the plane containing the opening 1211 along the first direction lies within the area corresponding to the opening 1211, in which case the area enclosed by the border 12313 of the reinforcing rib structure 123 is smaller than the area corresponding to the opening 1211. For example, the projection of the frame 12313 of the reinforcing rib structure 123 onto the plane where the opening 1211 is located along the first direction encloses the area corresponding to the opening 1211. In this case, the area enclosed by the frame 12313 of the reinforcing rib structure 123 is larger than the area corresponding to the opening 1211. That is, the reinforcing rib structure 123 not only covers the opening 1211, but also covers the surrounding area of ​​the opening 1211.

[0067] In some embodiments, the reinforcing rib structure 123 is disposed corresponding to the opening 1211, but its position in the first direction (i.e., the Z direction) is not limited. For example, the reinforcing rib structure 123 may be located inside the opening 1211 (i.e., in the plane of the opening 1211), with the inner surface of the pressure relief mechanism in contact with the reinforcing rib structure 123 to provide support and reinforcement. As another example, the reinforcing rib structure 123 and the opening 1211 may have a certain gap in the first direction, meaning a certain gap is reserved between the pressure relief mechanism and the reinforcing rib structure 123, and the two do not contact each other.

[0068] In some embodiments, the projected area of ​​the reinforcing rib structure 123 in the first direction (i.e., the Z direction) is smaller than the area of ​​the opening 1211. The area of ​​the opening 1211 refers to the orthographic projection area of ​​the opening 1211 onto a plane perpendicular to its through direction (i.e., the first direction), that is, the area enclosed by the outline of the opening 1211 (also called the opening region). The projected area of ​​the reinforcing rib structure 123 in the first direction refers to the total area of ​​at least one rib on the plane after the reinforcing rib structure 123 is orthographically projected along the first direction onto the plane where the opening 1211 is located. For example, the projected area of ​​the reinforcing rib structure 123 in the first direction is equal to the area of ​​the region enclosed by the hollow frame 12313 of the reinforcing rib structure minus the sum of the internal hollow areas. The sum of the internal hollow areas is the sum of the areas of all hollow regions in the hollow structure composed of at least one rib.

[0069] It is understandable that "the projected area of ​​the stiffener structure 123 is smaller than the area of ​​the opening 1211" does not require that the projected area of ​​the stiffener structure 123 be completely within the boundary of the opening 1211. The stiffener structure 123 is arranged around the opening 1211, that is, its projected area may be partially within the area of ​​the opening (covering the edge area of ​​the opening) and partially outside the area of ​​the opening (extending to the outer wall area of ​​the opening).

[0070] In some embodiments of this specification, by setting the openings corresponding to the reinforcing ribs, the structural rigidity of the opening area can be improved, preventing the pressure relief mechanism from being accidentally opened due to shell deformation; at the same time, the projected area of ​​the reinforcing ribs in the first direction is smaller than the opening area, reserving a flow path for gas discharge, thereby improving the smoothness of pressure relief and exhaust, and taking into account both rigidity reinforcement and pressure relief functions.

[0071] In some embodiments, the reinforcing rib structure 123 is integrally formed with the wall portion 121. For example, the reinforcing rib structure 123 can be integrally formed with the wall portion 121 through processes such as stamping, stretching, or casting. Figure 5A As shown, the reinforcing rib structure 123 is integrally formed with the wall portion 121. To demonstrate the integrally formed structure, Figure 5A Cross-sectional views along the X and Y directions are shown at the geometric center of wall 121. Figure 4 Compared to the structure 123 without reinforcing ribs, the opening 1211 shown is shown. Figure 4 The structure shown has low stiffness and is prone to deformation.

[0072] In some embodiments of this specification, the integrally molded structure increases the rigidity of the shell and prevents the pressure relief mechanism from being opened accidentally; the reinforcing rib structure is integrally molded with the wall, eliminating the need for additional parts and assembly processes, reducing the accumulation of connection tolerances, which is beneficial to improving structural accuracy and connection reliability, while reducing manufacturing costs.

[0073] In some embodiments, the thickness of the reinforcing rib structure 123 along the first direction (i.e., the Z direction) is less than the thickness of the wall portion 121 along the first direction.

[0074] The thickness of the reinforcing rib structure 123 along the first direction refers to the maximum distance between two points on the reinforcing rib structure 123 in the first direction. For example... Figure 8 As shown, the thickness of the reinforcing rib structure 123 along the first direction is marked as h2.

[0075] The thickness of the wall portion 121 along the first direction refers to the maximum distance between two points on the wall portion 121 in the first direction. That is, the thickness of the wall portion 121 along the first direction is the distance between the inner and outer surfaces of the wall portion 121 along the first direction. Figure 8 As shown, the thickness of the wall portion 121 along the first direction is marked as h1, and h2 is less than h1.

[0076] In some embodiments of this specification, by setting the stiffening rib structure to be thinner than the wall portion 121, it is possible to significantly improve the structural stiffness of the opening area while reducing the material volume and mass of the stiffening rib structure itself, which is beneficial to reducing the overall weight of the battery cell and meeting the lightweight requirements of the battery device.

[0077] Figure 6 This is a top view of a pressure relief mechanism installed on a wall according to some embodiments of this specification. Figure 7 This is an exploded view of a pressure relief mechanism installed on a wall according to some embodiments of this specification.

[0078] In some embodiments, such as Figure 6 As shown, the battery cell 100 also includes a pressure relief mechanism 130, which is installed on the side of the wall 121 away from the electrode assembly 110, and a reinforcing rib structure 123 is disposed between the pressure relief mechanism 130 and the electrode assembly 110 along the first direction.

[0079] In some embodiments, the pressure relief mechanism 130 may be integrally formed with the housing 120.

[0080] In some embodiments, the pressure relief mechanism 130 may also be separately configured and connected to the housing 120.

[0081] In some embodiments, along a first direction, the pressure relief mechanism 130 is mounted on the side of the wall portion 121 away from the electrode assembly 110, the reinforcing rib structure 123 is disposed on the side surface of the wall portion 121 facing the electrode assembly 110, the electrode assembly 110 is disposed below the wall portion 121, and the reinforcing rib structure 123 is disposed between the pressure relief mechanism 130 and the electrode assembly 110.

[0082] In some embodiments of this specification, by placing a reinforcing rib structure between the pressure relief mechanism and the electrode assembly, the reinforcing rib structure can not only bear the external extrusion load and suppress the transmission of opening deformation to the pressure relief mechanism, but also act as a rigid barrier between the electrode assembly and the pressure relief mechanism to prevent the electrode assembly from expanding and surging and breaking through the pressure relief mechanism during thermal runaway. Thus, the risk of the pressure relief mechanism being opened accidentally is effectively reduced under both external extrusion and internal thermal runaway conditions, thereby improving the safety performance of the battery device.

[0083] Figure 8 yes Figure 6 A cross-sectional view of region A in the middle.

[0084] In some embodiments, such as Figure 8As shown, in the first direction, there is a gap between the pressure relief mechanism 130 and the reinforcing rib structure 123, meaning that the pressure relief mechanism 130 and the reinforcing rib structure 123 do not contact each other spatially. This prevents structural interference during assembly, provides space for the opening action of the pressure relief mechanism 130 upon triggering, and reduces the risk of accidental opening caused by external loads being directly transmitted to the pressure relief mechanism 130 through the reinforcing rib structure 123.

[0085] In some embodiments of this specification, when the housing is subjected to external pressure or vibration impact, the reinforcing rib structure bears and disperses the deformation stress, and the gap ensures that the stress is not directly transmitted to the pressure relief mechanism, reducing the risk of the pressure relief mechanism being accidentally opened due to housing deformation.

[0086] In some embodiments, such as Figure 8 As shown, the gap between the pressure relief mechanism 130 and the reinforcing rib structure 123 can be represented by c, and the gap c is within a preset range. For example, the preset range is 0.05 mm to 4 mm. The preset range is set according to actual needs. If the gap is too small, it will be difficult to effectively absorb manufacturing tolerances and prevent stress transmission; if the gap is too large, it may reduce the effective support range of the reinforcing rib structure 123 for the opening edge, affecting the stiffness enhancement effect. Among them, manufacturing tolerance refers to the allowable deviation range between the actual machined dimensions and the theoretical dimensions marked on the design drawings during the manufacturing process of the parts.

[0087] In some embodiments, the gap is in the range of 0.05 mm to 4 mm. For example, the gap may be in the range of 0.1 mm to 3 mm. As another example, the gap may be in the range of 0.15 mm to 2.5 mm.

[0088] In some embodiments of this specification, by setting the gap between the pressure relief mechanism and the reinforcing rib structure within a preset range, the lower limit of the range can absorb manufacturing tolerances and slight deformation of components under stress, ensuring that the pressure relief mechanism and the reinforcing rib structure do not contact each other under normal operating conditions, thus achieving stress isolation. Simultaneously, the upper limit of the range allows the reinforcing rib structure to provide timely stiffness support when the pressure relief mechanism is subjected to internal air pressure, reducing the risk of unexpected local deformation caused by excessive suspension of the pressure relief mechanism. Therefore, this gap range combines the dual functions of "stress isolation" and "effective support under load," which is beneficial to improving the structural integrity and opening reliability of the pressure relief mechanism under all operating conditions.

[0089] In some embodiments, the reinforcing rib structure 123 is also provided around the opening 1211. For example, the reinforcing rib structure 123 further includes an annular structure 1232 disposed circumferentially along the opening 1211, such as... Figure 5A As shown.

[0090] The surrounding arrangement of the opening 1211 refers to the annular structure 1232 surrounding the opening 1211. In this way, the reinforcing rib structure 123 provides uniform structural stiffness compensation throughout the entire circumference of the opening 1211.

[0091] In some embodiments of this specification, by arranging the reinforcing ribs around the opening, the opening edge receives stiffness compensation at all positions in the circumferential direction, reducing the risk of weak points formed due to uneven local reinforcement. Thus, when the wall is subjected to external loads, the deformation of the opening edge can be uniformly constrained, preventing stress concentration in a certain area from being transmitted to the pressure relief mechanism. This is beneficial to improving the flatness of the mounting surface of the pressure relief mechanism and the reliability of the sealing interface, and reducing the risk of stress concentration or accidental opening of the pressure relief mechanism due to local warping.

[0092] In some embodiments, the ratio of the total projected area of ​​the reinforcing rib structure 123 in the first direction to the area of ​​the opening 1211 is in the range of 30%-60%. The total projected area of ​​the reinforcing rib structure 123 in the first direction is the sum of the projected areas of all solid material (i.e., excluding the hollowed-out portions) of the reinforcing rib structure 123 in the first direction. In some embodiments, the reinforcing rib structure 123 includes at least one rib 1231. The total projected area of ​​the reinforcing rib structure 123 in the first direction is the sum of the projected areas of at least one rib 1231 on the plane containing the opening 1211. In some embodiments, the area of ​​the projected region of the rib 1231 along the first direction on the plane containing the opening 1211 is the projected area of ​​the rib 1231 on the plane containing the opening 1211. When the reinforcing rib structure 123 includes multiple ribs 1231, the sum of the projected areas of the multiple ribs 1231 is the total projected area of ​​at least one rib 1231 in the first direction. The total area of ​​the projection of at least one rib 1231 is equivalent to the area of ​​the region enclosed by the frame 12313 of the reinforcing rib structure 123 minus the total area of ​​the hollow area, reflecting the degree of coverage of the solid part of the rib 1231 on the plane where the opening 1211 is located.

[0093] In some embodiments, the ratio of the total area of ​​the projection of the reinforcing rib structure 123 in the first direction (or the total area of ​​the projection of at least one rib 1231 in the first direction) to the area of ​​the opening 1211 is in the range of 30%-60%. For example, the ratio of the total area of ​​the projection of at least one rib 1231 in the first direction to the area of ​​the opening 1211 is in the range of 35%-55%. As another example, the ratio of the total area of ​​the projection of at least one rib 1231 in the first direction to the area of ​​the opening 1211 is in the range of 40%-50%.

[0094] In some embodiments of this specification, by controlling the ratio of the total area of ​​the projection of the reinforcing rib structure in the first direction to the area of ​​the opening within a certain range, an effective load transfer network can be formed to distribute external loads, and the gaps between the ribs can have sufficient ventilation area to allow gas to flow, thus taking into account both structural reinforcement and pressure relief functions.

[0095] Rib 1231 refers to a strip-shaped structure set inside the frame 12313 of the reinforcing rib structure 123, having a certain length, width and height (protrusion height along the first direction), and extending in a specific direction.

[0096] In some embodiments, the reinforcing rib structure 123 may include a rib 1231. For example, the rib 1231 is rectangular, with both ends of the rib 1231 connected to the frame 12313 and extending in any direction (e.g., the X direction or the Y direction), forming a hollow structure with the frame 12313.

[0097] In some embodiments, the reinforcing rib structure 123 includes a plurality of ribs 1231, which can be arranged within the border 12313 in a manner such as spaced arrangement, ring nesting, or grid intersection. Taking spaced arrangement as an example, for instance... Figure 5B As shown, the reinforcing rib structure 123 may include multiple ribs 1231. Each rib 1231 provides rigid support to the edge of the opening in its corresponding position, thereby achieving all-round reinforcement of the opening 1211.

[0098] In some embodiments, such as Figure 5B As shown, the reinforcing rib structure 123 includes at least one first rib 12311 and at least one second rib 12312. The first rib 12311 extends along a second direction, and the second rib 12312 extends along a third direction. The second direction intersects the third direction and is perpendicular to the first direction. The first rib 12311 and the second rib 12312 intersect each other to form a cross-grid reinforcing rib structure 123.

[0099] The second direction and the third direction are two different directions within the plane containing the wall portion 121. They do not coincide and have an angle of intersection (i.e., they form a certain angle). For example, the second direction can be the X direction, and the third direction can be the Y direction, and they are perpendicular to each other. As another example, the second direction can be an oblique direction at a 30° angle to the X direction, and the third direction can be another oblique direction at a 120° angle to the X direction, and they intersect but are not perpendicular.

[0100] In some embodiments, the first rib 12311 and the second rib 12312 intersect in space to form an intersection point. By providing intersecting first ribs 12311 and second ribs 12312, stiffness compensation can be provided simultaneously in two different directions, effectively constraining the bending deformation of the opening edge in multiple directions.

[0101] In some embodiments of this specification, a cross-grid reinforcing rib structure is employed to uniformly distribute external loads in multiple directions, reducing the risk of stress concentration in localized areas of the opening and suppressing deformation at the opening edges. Simultaneously, the grid gaps form gas flow channels, allowing gas generated by the electrode assembly during thermal runaway to flow smoothly to the pressure relief mechanism, ensuring timely and reliable pressure relief. Thus, the cross-grid structure balances the need for stiffness reinforcement in the opening area with the requirement for unobstructed pressure relief channels.

[0102] In some embodiments, the first rib 12311 is perpendicular to the second rib 12312.

[0103] In some embodiments, such as Figure 5B As shown, the second direction is parallel to the X-axis, and the third direction is parallel to the Y-axis. Correspondingly, the first rib 12311 is perpendicular to the second rib 12312.

[0104] In some embodiments, the second and third directions are not limited to the implementations described above with respect to the X and Y directions. The second and third directions can also be any two other mutually perpendicular directions within the plane containing the wall portion 121. For example, by rotating the XY coordinate system around an axis perpendicular to the plane containing the wall portion 121 (i.e., the first direction) by a predetermined angle (such as 30°, 45°, 60°, etc.), the two orthogonal axes in the rotated coordinate system can be used as the second and third directions, respectively. Accordingly, the first rib 12311 and the second rib 12312 extend along the two rotated orthogonal axes and intersect each other perpendicularly. Thus, the extension direction of the ribs can be flexibly adjusted according to the specific shape and size of the opening 1211 and the expected direction of the external load, so that the arrangement direction of the ribs matches the principal stress direction or principal load direction of the opening 1211, thereby obtaining a better reinforcement effect.

[0105] In some embodiments of this specification, by setting the first and second ribs as an orthogonal mesh structure perpendicular to each other, the reinforcing rib structure has the same moment of inertia and bending stiffness in both the second and third directions, thereby exhibiting balanced mechanical properties in the two mutually perpendicular directions. Simultaneously, the orthogonal shape facilitates one-piece molding using a stamping die, which helps simplify the die structure, reduce die manufacturing costs, and improve dimensional consistency of the product in mass production.

[0106] In some embodiments, the reinforcing rib structure 123 includes a plurality of parallel and spaced-apart ribs.

[0107] Parallelism means that multiple ribs extend in the same direction without intersecting or converging, and their extension directions are parallel to each other.

[0108] Spacing refers to the spacing between two adjacent reinforcing bars in a direction perpendicular to the extension direction of the reinforcing bars, so that they do not touch each other.

[0109] In some embodiments, the spacing between multiple ribs can be the same or different. For example, the spacing between ribs near the edge of opening 1211 can be smaller to provide denser reinforcement in areas with the highest risk of deformation; the spacing between ribs farther from the edge of opening 1211 can be larger to reduce material usage while maintaining the reinforcement range. By adjusting the density distribution of the rib spacing, differentiated designs can be implemented for the reinforcement needs of different areas, thereby optimizing reinforcement efficiency. The spacing between ribs can be set based on actual requirements.

[0110] In some embodiments, multiple straight ribs extend in the same direction and are spaced apart perpendicular to the direction of extension. In some embodiments, multiple annular (closed ring or open ring) ribs are arranged concentrically and spaced apart radially, and the multiple annular ribs are connected to each other by connecting parts and connected to the frame 12313. The shape and arrangement of the ribs can be selected according to actual needs.

[0111] In some embodiments of this specification, by arranging multiple ribs in parallel intervals and extending in the same direction, the structure is regular and the layout is simple. This facilitates the integral forming of the wall with the stamping process, which helps to simplify the mold structure, reduce mold manufacturing costs, and improve the yield of stamping. Simultaneously, the arrangement of multiple parallel ribs along a specific direction (such as a second or third direction) can provide directional stiffness compensation in a direction perpendicular to the rib extension direction. This is suitable for applications with specific requirements for stiffness in a particular direction, achieving precise directional reinforcement.

[0112] The embodiments of this specification achieve at least the following technical effects: (1) By setting the opening corresponding to the reinforcing rib structure, the structural rigidity of the opening area can be improved, preventing the pressure relief mechanism from being opened by mistake due to shell deformation; at the same time, the projected area of ​​the reinforcing rib structure in the first direction is smaller than the opening area, reserving a flow path for gas discharge, thereby improving the smoothness of pressure relief and exhaust, taking into account both rigidity reinforcement and pressure relief functions; (2) The reinforcing rib structure is integrally formed with the wall, requiring no additional parts and assembly processes, reducing the accumulation of connection tolerances, which is conducive to improving structural accuracy and connection reliability, while reducing manufacturing costs; (3) When the shell is subjected to external extrusion or vibration impact, the reinforcing rib structure bears and disperses deformation stress, and the gap ensures that the stress will not be directly transmitted to the pressure relief mechanism, reducing the risk of the pressure relief mechanism being opened by mistake due to shell deformation; (4) By controlling the ratio of the total projected area of ​​the reinforcing rib structure in the first direction to the area of ​​the opening to 30% to 60%, an effective load transfer network can be formed to disperse external loads, and the gap between the ribs can have sufficient ventilation area to allow gas to flow, taking into account both structural reinforcement and pressure relief functions.

[0113] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this specification. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification and therefore remain within the spirit and scope of the exemplary embodiments described herein.

[0114] Finally, it should be understood that the embodiments described in this specification are merely illustrative of the principles of the embodiments described herein. Other variations may also fall within the scope of this specification. Therefore, alternative configurations of the embodiments described herein are intended to be illustrative rather than limiting, and should be considered consistent with the teachings of this specification. Accordingly, the embodiments described herein are not limited to those explicitly introduced and described herein.

Claims

1. A battery cell, comprising an electrode assembly and a housing, wherein the electrode assembly is housed within the housing; characterized in that, The housing includes: The wall portion has an opening; A pressure relief mechanism, which is installed on the wall and covers the opening; A reinforcing rib structure is provided corresponding to the opening and connected to the wall. The projected area of ​​the reinforcing rib structure in a first direction is smaller than the area of ​​the opening. Along the first direction, the reinforcing rib structure is disposed between the pressure relief mechanism and the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The reinforcing rib structure is integrally formed with the wall portion.

3. The battery cell according to claim 1, characterized in that, In the first direction, there is a gap between the pressure relief mechanism and the reinforcing rib structure.

4. The battery cell according to claim 3, characterized in that, The gap is in the range of 0.1 mm to 3 mm.

5. The battery cell according to claim 1, characterized in that, The reinforcing rib structure also includes a ring structure arranged circumferentially along the opening.

6. The battery cell according to any one of claims 1-5, characterized in that, The ratio of the total area of ​​the reinforcing rib structure projected in the first direction to the area of ​​the opening is in the range of 30%-60%.

7. The battery cell according to claim 6, characterized in that, The reinforcing rib structure includes at least one first rib and at least one second rib. The first rib extends along a second direction, and the second rib extends along a third direction. The second direction and the third direction intersect each other and are both perpendicular to the first direction.

8. The battery cell according to claim 6, characterized in that, The reinforcing rib structure includes multiple parallel and spaced-apart ribs.

9. The battery cell according to any one of claims 1-5, characterized in that, The thickness of the reinforcing rib structure along the first direction is less than the thickness of the wall portion along the first direction.

10. The battery cell according to any one of claims 1-5, characterized in that, The housing includes a body and a top cover, the top cover being connected to the open end of the body, and the wall portion being the top cover.

11. A battery device, characterized in that, It includes multiple battery cells as described in any one of claims 1-10.

12. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-10 or a battery device as described in claim 11.

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