Battery device, energy storage device, and electric device

Abstract

Provided in embodiments of the present disclosure are a battery device, an energy storage device, and an electric device. The battery device comprises a case and a pressure relief mechanism. The case comprises a vent hole, and the vent hole is in communication with the outside of the case. The pressure relief mechanism comprises a fixed part and a sealing part, the fixed part is fixed to the case, the sealing part covers the case in a first direction and is located outside the case, at least part of the sealing part is elastically deformable and sealingly engages with the case so as to isolate the vent hole from the outside of the battery device, the sealing part is connected to the fixed part, and the rigidity of the fixed part is greater than that of the sealing part. According to the battery device in the embodiments of the present disclosure, by making the rigidity of the fixed part greater than that of the sealing part, deformation of the fixed part under the acting force generated by deformation of the sealing part is suppressed, thereby reducing the difference between the actual deformation amount and the designed desired deformation amount of the sealing part, and facilitating opening of the pressure relief mechanism at an appropriate time to release emissions.

Description

A battery device, an energy storage device, and an electrical appliance. Technical Field

[0001] This disclosure relates to the field of battery technology, specifically to a battery device, an energy storage device, and an electrical device. Background Technology

[0002] The battery device is equipped with a pressure relief mechanism, which can discharge the high-temperature and high-pressure emissions generated by thermal runaway of individual battery cells in the battery device, thereby reducing the risk of further deterioration of thermal runaway or explosion in the battery device.

[0003] In related technologies, a portion of the pressure relief mechanism is capable of elastic deformation. Under normal operating conditions of the battery device, this portion maintains a sealed fit with the casing, isolating the interior of the casing from the outside environment. In the event of thermal runaway of the battery device, this portion can detach from the casing, allowing the emissions generated by the thermal runaway to be ejected from the casing.

[0004] It is understandable that the deformation of the elastic deformation part of the pressure relief mechanism is directly proportional to the magnitude of the force driving it to separate from the casing. During the assembly of the pressure relief mechanism, the elastic potential energy generated by the elastic deformation part exerts a force on other parts of the mechanism, thus affecting the deformation of the elastic deformation part itself. This could potentially lead to the pressure relief mechanism opening prematurely or delayed in the event of thermal runaway in the battery device. Summary of the Invention

[0005] In view of this, the present disclosure aims to provide a battery device, energy storage device, and power consumption device that facilitates the opening pressure of the pressure relief mechanism to meet preset requirements.

[0006] To achieve the above objectives, the technical solution of this disclosure embodiment is implemented as follows:

[0007] This disclosure provides a battery device, the battery device comprising:

[0008] The housing includes a discharge port that communicates with the outside of the housing;

[0009] The pressure relief mechanism includes a fixing part and a sealing part. The fixing part is fixed to the housing, and the sealing part is disposed on the housing along a first direction and located outside the housing. At least a portion of the sealing part is capable of elastic deformation and sealingly fitting with the housing to isolate the discharge port from the outside of the battery device. The sealing part is connected to the fixing part, and the stiffness of the fixing part is greater than that of the sealing part.

[0010] The battery device in this embodiment of the present disclosure, by making the stiffness of the fixing part greater than that of the sealing part, is beneficial to suppressing the deformation of the fixing part caused by the deformation of the sealing part, thereby reducing the difference between the actual deformation of the sealing part and the deformation required by the design. This is beneficial to ensure that the pressure required for the emission to drive the pressure relief mechanism to open meets the design requirements, and that the pressure relief mechanism opens at the appropriate time to release the emission.

[0011] In some embodiments, the fixing part includes a main body and a rigid member, the main body has a mounting cavity, at least a portion of the rigid member is disposed in the mounting cavity, the main body is connected to the sealing part, the material of the main body is the same as the material of the sealing part, and the hardness of the material of the rigid member is greater than the hardness of the material of the main body;

[0012] And / or, the elastic modulus of the material of the rigid component is greater than the elastic modulus of the material of the main body.

[0013] Under the same force, the rigid component has a stronger resistance to deformation than the main body. Therefore, the rigid component can support the main body, thereby reducing the deformation of the main body under the force of the sealing part. This helps to keep the deformation of the sealing part within the design range, and helps to ensure that the pressure required for the discharge to drive the pressure relief mechanism to open meets the design requirements.

[0014] In some embodiments, the mounting cavity is open to the outside of the battery device, allowing the rigid component to enter the mounting cavity through the open position. This simplifies the assembly process between the rigid component and the main body, improving assembly efficiency; it also facilitates observation from the outside of the battery device to check for slippage between the rigid component and the main body, enabling maintenance.

[0015] In some embodiments, the rigid component is entirely located within the mounting cavity. This reduces the probability of the rigid component colliding with external objects and moving or even detaching from the main body during daily operation of the battery device, thus extending the service life of the pressure relief mechanism.

[0016] In some embodiments, the main body can be inserted into the housing along the first direction, and the mounting cavity is open on one side along the first direction to communicate with the outside of the battery device. This avoids the situation where the main body is difficult to deform and insert into the housing due to support from rigid components, allowing for easier and faster insertion and fixation of the main body into the housing, thus improving the installation efficiency of the pressure relief mechanism.

[0017] In some embodiments, the housing has an installation space and an installation hole. The installation space is located inside the housing, and the installation hole and the discharge hole connect the installation space to the outside of the housing. A portion of the main body can be inserted into the installation hole into the installation space. At least a portion of the surface of the main body perpendicular to the first direction is recessed to form a positioning groove. A portion of the housing is embedded in the positioning groove and engages with the groove wall along the first direction. Thus, the limiting effect between the groove wall and the housing along the first direction ensures that the pressure relief mechanism remains fixed to the housing along the first direction, which helps to suppress displacement of the fixed part along the first direction when the discharged material impacts the sealing part. The fixing method between the fixed part and the housing is simple in structure and facilitates the installation of the pressure relief mechanism.

[0018] In some embodiments, the side of the mounting cavity closest to the mounting space along the first direction is a closed end. This ensures that, on the one hand, after thermal runaway of the battery device, the emissions will not directly impact the rigid component, preventing relative movement between the rigid component and the main body; on the other hand, the bottom wall of the mounting cavity along the first direction limits the rigid component along that direction, thus improving the supporting effect of the rigid component on the main body.

[0019] In some embodiments, the minimum distance between the bottom wall of the mounting cavity near the mounting space along the first direction and the end face of the portion of the main body located within the mounting space along the first direction is not less than 1 mm. This reduces the probability of the rigid component penetrating the main body during insertion into the mounting cavity and after prolonged use of the battery device, thus extending the service life of the pressure relief mechanism.

[0020] In some embodiments, one end of the rigid member along the first direction is flush with the edge of the open position of the mounting cavity. This allows the rigid member to support a larger area of ​​the main body along the first direction, thereby better suppressing deformation of the main body under the force applied by the sealing portion, and consequently ensuring that the deformation of the sealing portion meets design requirements.

[0021] In some embodiments, the minimum distance along the first direction between the outer side of the rigid component away from the battery device and the end of the main body portion located within the mounting space along the first direction is a first distance, and the minimum distance along the first direction between the groove wall of the positioning groove near the mounting space and the end of the main body portion located within the mounting space along the first direction is a second distance, wherein the first distance is not greater than the second distance. This ensures that the portion of the main body exposed outside the casing is supported by the main body, thereby improving the suppression of deformation of the main body under the action of the sealing portion, and thus helping to ensure that the deformation of the sealing portion meets design requirements.

[0022] In some embodiments, a portion of the rigid component is located within the mounting space, and the minimum distance by which the rigid component extends beyond the positioning groove along the first direction from the outer side of the battery device is a third distance, which is no greater than half of the second distance. This reduces the deformation suppression effect of the rigid component on the portion of the main body that needs to be inserted into the mounting space, facilitating elastic deformation of this portion during its passage through the mounting hole, improving the ease of insertion of the main body into the mounting hole, and increasing the installation efficiency of the pressure relief mechanism.

[0023] In some embodiments, the portion of the main body inserted into the installation space is a cone. This facilitates the smoother insertion of the main body into the installation space, improves the convenience of inserting the main body into the installation hole, and increases the installation efficiency of the pressure relief mechanism.

[0024] And / or, the outer end of the rigid component away from the battery device along the first direction is tapered, which facilitates the smoother insertion of the rigid component into the mounting cavity and improves the ease of installation between the rigid component and the main body.

[0025] In some embodiments, the main body and the sealing part are an integral structure. This simplifies the manufacturing process of the main body and the sealing part, improving production efficiency; furthermore, it eliminates the seam between the main body and the sealing part, reducing the probability of emissions directly breaking through the sealing part.

[0026] In some embodiments, the area where the sealing portion connects to the main body is located on the side of the rigid member perpendicular to the first direction. This allows the rigid member to better suppress deformation of the main body caused by the sealing portion, thereby helping to ensure that the deformation of the sealing portion meets design requirements.

[0027] In some embodiments, the main body is made of one of silicone rubber, fluororubber, or EPDM rubber. This provides the main body with good elasticity for installation with the housing, and reduces the probability that the main body will be burned and lose its fixation to the housing in the event of thermal runaway of the battery device.

[0028] And / or, the material of the rigid component is one of polypropylene, polyamide, polycarbonate, or metal, so that the rigid component has good structural strength, which helps to reduce the deformation of the rigid component itself under the force applied by the sealing part.

[0029] In some embodiments, the hardness of the material of the fixing part is greater than the hardness of the sealing part;

[0030] And / or, the elastic modulus of the material of the fixing part is greater than that of the material of the sealing part. This achieves the goal of making the stiffness of the solid part greater than that of the sealing part, thereby helping to keep the deformation of the sealing part within the design range and ensuring that the pressure required for the discharge to drive the pressure relief mechanism to open meets the design requirements.

[0031] In some embodiments, the sealing part is made of one of silicone rubber, fluororubber, and EPDM rubber. In this way, on the one hand, the sealing part has good elasticity so as to achieve a tight seal with the housing; on the other hand, it reduces the probability that the sealing part will be burned in the event of thermal runaway of the battery device, thus failing to restrain the direction of emission.

[0032] And / or, the material of the fixing part is one of polypropylene, polyamide, polycarbonate, and metal. In this way, the fixing part has good structural strength, which helps to reduce the deformation of the fixing part itself under the force applied by the sealing part.

[0033] In some embodiments, the fixing part includes a rigid part and an elastic part, the elastic part is disposed at one end of the rigid part along the first direction, the sealing part is connected to the rigid part, the housing is provided with an installation space and an installation hole, the installation space is located inside the housing, the installation hole and the discharge hole communicate between the installation space and the outside of the housing, the elastic part can generate elastic deformation to be inserted into the installation space through the installation hole, the elastic part stops and cooperates with the inner wall of the installation space along the first direction, and the hardness of the material of the rigid part is greater than the hardness of the material of the sealing part;

[0034] And / or, the elastic modulus of the material of the rigid part is greater than that of the material of the sealing part. This helps to reduce the deformation of the fixing part under the force of the sealing part.

[0035] In some embodiments, the hardness of the material of the rigid portion is greater than the hardness of the material of the elastic portion;

[0036] And / or, the elastic modulus of the material of the rigid part is greater than the elastic modulus of the material of the elastic part. This facilitates the deformation of the elastic part under the pressure of the rigid part and the housing during the insertion of the elastic part into the mounting hole, improving the ease of insertion.

[0037] In some embodiments, the minimum distance between the end of the rigid portion near the elastic portion along the first direction and the end of the elastic portion away from the rigid portion along the first direction is not less than 1 mm. This reduces the probability that the rigid portion will puncture the elastic portion during the insertion of the elastic portion into the installation space.

[0038] In some embodiments, a portion of the rigid part is inserted into the elastic part, and the dimension of the inserted portion along the first direction does not exceed half the dimension of the elastic part along the first direction. This reduces the inhibitory effect of the rigid part on the deformation of the elastic part, facilitating elastic deformation of the portion as it passes through the mounting hole, improving the ease of insertion of the elastic part into the mounting hole, and increasing the installation efficiency of the pressure relief mechanism.

[0039] In some embodiments, the end of the elastic portion away from the rigid portion along the first direction is a cone, and the end of the rigid portion along the first direction is inserted into the elastic portion and is also a cone. This makes the shape of the end of the elastic portion away from the rigid portion conform to the shape of the rigid portion within the elastic portion, reducing the inhibitory effect of the rigid portion on the deformation of the elastic portion during insertion into the mounting hole. This facilitates elastic deformation of the elastic portion during passage through the mounting hole, improving the ease of insertion of the elastic portion into the mounting hole and increasing the installation efficiency of the pressure relief mechanism.

[0040] In some embodiments, the fixing portion extends along the first direction, and the sealing portion is circumferentially disposed around the fixing portion perpendicular to the first direction. The end of the sealing portion perpendicular to the first direction away from the fixing portion is closer to the first end of the fixing portion than the end closer to the fixing portion along the first direction, and the first end can be fixed to the housing. This allows the end of the sealing portion away from the fixing portion to be subjected to the pre-tightening force of the housing during the installation of the fixing portion and the housing along the first direction, thereby causing deformation. By applying the pre-tightening force to the sealing portion, the sealing portion remains in contact with the housing during normal use of the battery device, reducing the probability of the sealing portion separating from the housing due to collisions or other factors during normal use of the battery device, and helping to maintain the airtightness of the internal space of the housing.

[0041] In some embodiments, the housing is provided with a mounting hole, which is open on one side along the first direction to communicate with the outside of the housing. The first end can be inserted into the mounting hole. The fixing part is provided with a stop surface, which is located outside the housing and can stop and cooperate with the housing along the first direction. The minimum distance along the first direction between the end of the sealing part perpendicular to the first direction away from the fixing part and the end face of the first end is a fourth distance, and the minimum distance along the first direction between the stop surface and the end face of the first end is a fifth distance. The fourth distance is less than the fifth distance. In this way, the stop surface can limit the insertion depth of the fixing part in the mounting hole. At the same time, when the stop surface abuts against the housing, the sealing part and the housing achieve a sealing fit and undergo elastic deformation, which is beneficial to improving the installation convenience of the pressure relief mechanism.

[0042] This disclosure also provides an energy storage device, including the battery device described in any of the foregoing embodiments. This facilitates the timely activation of the pressure relief mechanism to release emissions in the event of thermal runaway of the battery device, reducing the risk of further damage to other components within the energy storage device.

[0043] This disclosure also provides an electrical device, including a battery device from any of the foregoing embodiments or an energy storage device from the foregoing embodiments. This facilitates the timely activation of a pressure relief mechanism to release emissions in the event of thermal runaway of the battery device, reducing the risk of further damage to other components in the electrical device caused by the battery.

[0044] In some embodiments, the electrical device includes an aircraft. This facilitates the aircraft maintaining normal operation even in the event of thermal runaway of the battery. Attached Figure Description

[0045] Figure 1 is a schematic diagram of an embodiment of the present disclosure in which the electrical device is a vehicle;

[0046] Figure 2 is a schematic diagram of a battery in one embodiment of this disclosure;

[0047] Figure 3 is a schematic diagram of part of the box and pressure relief mechanism in the first embodiment of this disclosure;

[0048] Figure 4 is a cross-sectional view of position AA in Figure 3;

[0049] Figure 5 is a schematic diagram of the embodiment in Figure 4 where the sealing part is separated from the box body, wherein the dashed arrows indicate the flow path of some of the emissions;

[0050] Figure 6 is a schematic diagram of the pressure relief mechanism in the second embodiment of this disclosure;

[0051] Figure 7 is a cross-sectional schematic diagram of the pressure relief mechanism in Figure 6, and the cutting direction is the same as the AA direction in Figure 3;

[0052] Figure 8 is a cross-sectional schematic diagram of part of the box and the pressure relief mechanism in the third embodiment of this disclosure. The cross-sectional direction is the same as that of position AA in Figure 3.

[0053] Figure 9 is a cross-sectional schematic diagram of the pressure relief mechanism in the fourth embodiment of this disclosure, and the cutting direction is the same as the AA direction in Figure 3. Detailed Implementation

[0054] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this disclosure can be combined with each other. The detailed description in the specific implementation should be understood as an explanation of the purpose of the embodiments of this disclosure and should not be regarded as an improper limitation on the embodiments of this disclosure.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of this disclosure belong; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this disclosure; the terms “comprising” and “having”, and any variations thereof, in the description of embodiments of this disclosure and the foregoing drawings, are intended to cover non-exclusive inclusion.

[0056] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0057] 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 disclosure. 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.

[0058] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0059] In the description of the embodiments of this disclosure, for ease of explanation, as shown in the accompanying drawings, the direction in which the arrow X is located is referred to as the "first direction".

[0060] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0061] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0062] In this embodiment of the disclosure, the battery cell 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.

[0063] The battery cell can 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., and the embodiments disclosed herein are not limited to this.

[0064] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0065] The battery device mentioned in the embodiments of this disclosure may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0066] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0067] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0068] In some embodiments, referring to FIG2, the battery device may be a battery pack, which includes a housing and one or more battery cell assemblies housed in the housing.

[0069] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0070] As an example, the battery cell assembly can also be housed in the housing by directly fixing multiple battery cells 30 to the housing.

[0071] As an example, referring to Figure 2, the housing 10 may include a first housing 11 and a second housing 12. The first housing 11 and the second housing 12 are fastened together to form a closed space inside the housing 10 to house the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 11 may be a top cover or a bottom plate.

[0072] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0073] In some embodiments, the housing 10 may be part of the vehicle's chassis structure. For example, a portion of the housing 10 may be at least a portion of the vehicle's floor, or a portion of the housing 10 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0074] This disclosure provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0075] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this disclosure can be any power system that requires energy storage devices.

[0076] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0077] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0078] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0079] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0080] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0081] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as the Insulation Monitoring Module (IMM), the Master Battery Management Unit (MBMU), the Ethernet (ETH) module, and the fiber optic conversion module.

[0082] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0083] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0084] The technical solutions described in the embodiments of this disclosure are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0085] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this disclosure. The description is as follows, in conjunction with the accompanying drawings.

[0086] Figure 1 is a structural schematic diagram of a vehicle 1000 provided in an embodiment of this disclosure. The vehicle 1000 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. As shown in Figure 1, a battery device 100 is provided inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

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

[0088] The embodiments of this disclosure will now be described in detail.

[0089] In related technologies, the pressure relief mechanism includes a sealing part, which is located on the casing and covers the discharge port. The sealing part can undergo elastic deformation to maintain a tight seal with the casing. After thermal runaway of the battery device, the generated emissions can impact the sealing part and separate it from the casing, allowing the emissions to be discharged from the gap formed between the sealing part and the casing to the outside of the casing.

[0090] Understandably, the pressure required for the emissions to drive the seal to separate from the housing depends on the amount of deformation of the seal.

[0091] When the sealing part is in a sealed fit with the housing, the sealing part undergoes elastic deformation, which can exert a force on other parts of the pressure relief mechanism and cause deformation of other parts of the pressure relief mechanism. This results in the release of some elastic potential energy of the sealing part, reducing the amount of deformation. Consequently, the actual pressure required for the discharge to drive the sealing part to separate from the housing is less than the design requirement, which adversely affects the normal opening and closing of the pressure relief mechanism.

[0092] Based on the above-mentioned technical problems, the present disclosure aims to provide a battery device in which the pressure relief structure includes a fixed part and a sealing part connected to each other. The rigidity of the fixed part is greater than that of the sealing part, which helps to reduce the deformation of the fixed part under the force of the sealing part, and thus helps to ensure that the deformation of the sealing part in the fit with the housing meets the design requirements.

[0093] Specifically, referring to Figures 3 to 5, the battery device 100 in this embodiment of the present disclosure includes a housing 10 and a pressure relief mechanism 20.

[0094] The housing 10 includes a discharge port 10b, which communicates with the outside of the housing 10.

[0095] The pressure relief mechanism 20 includes a fixing part 22 and a sealing part 21. The fixing part 22 is fixed to the housing 10, and the sealing part 21 is disposed on the housing 10 along a first direction and located outside the housing 10. At least a portion of the sealing part 21 can undergo elastic deformation and seal against the housing 10 to isolate the discharge hole 10b from the outside of the battery device 100. The sealing part 21 is connected to the fixing part 22, and the rigidity of the fixing part 22 is greater than the rigidity of the sealing part 21.

[0096] The housing 10 has an installation space 10a for arranging battery cells 30. The discharge hole 10b is connected to the installation space 10a so that after the battery cells 30 in the installation space 10a undergo thermal runaway, the emissions can be discharged through the discharge hole 10b.

[0097] At least a portion of the sealing part 21 covers the outer surface of the housing 10.

[0098] When the battery device 100 is operating normally, the sealing part 21 is fixed in relative position to the housing 10 by the fixing part 22, so that the sealing part 21 is in a state of elastic deformation, thereby enabling the sealing part 21 to isolate the discharge hole 10b from the outside of the battery device 100. Because the sealing part 21 undergoes elastic deformation, it helps to reduce the probability that the sealing part 21 will detach from the housing 10 after coming into contact with an object outside the battery device 100.

[0099] In the event of thermal runaway of the battery device 100, the discharge material in the installation space 10a enters the discharge hole 10b and impacts the sealing part 21. As the pressure exerted on the sealing part 21 by the discharge material increases, at least a portion of the sealing part 21 tends to deform away from the housing 10 until the force exerted by the discharge material on the sealing part 21 is sufficient to drive the sealing part 21 to separate from the housing 10, thereby creating a gap between the sealing part 21 and the housing 10. The discharge material passes through the gap and is discharged outside the battery device 100.

[0100] Understandably, when the battery device 100 is operating normally, the sealing part 21 undergoes elastic deformation, which causes the sealing part 21 to exert a force on the fixing part 22, thereby causing the fixing part 22 to deform and reducing the amount of deformation of the sealing part 21 itself.

[0101] Stiffness is the ability of a material or structure to resist elastic deformation when subjected to stress; it is a characterization of how easily a material or structure can undergo elastic deformation.

[0102] The rigidity of the fixing part 22 is greater than that of the sealing part 21, which helps to reduce the amount of deformation of the fixing part 22 under the force applied by the sealing part 21, thereby making it easier to keep the amount of deformation of the sealing part 21 itself within a reasonable range.

[0103] The battery device 100 in this embodiment of the present disclosure, by making the stiffness of the fixing part 22 greater than the stiffness of the sealing part 21, helps to suppress the deformation of the fixing part 22 caused by the deformation of the sealing part 21, thereby helping to reduce the difference between the actual deformation of the sealing part 21 and the deformation required by the design, thus helping to ensure that the pressure required for the emission to drive the pressure relief mechanism 20 to open meets the design requirements, and helping the pressure relief mechanism 20 to open at an appropriate time to release the emission.

[0104] In some embodiments, referring to Figures 4 and 5, a portion of the sealing part 21 is fitted to the housing 10, and another portion is spaced apart from the housing 10 to form a buffer space 20a. The buffer space 20a is connected to the discharge hole 10b. Thus, after the discharge material is discharged from the discharge hole 10b, it enters the buffer space 20a and accumulates in the buffer space 20a, so that the pressure exerted by the discharge material in the buffer space 20a on the sealing part 21 increases until the pressure can drive the portion of the sealing part 21 that was originally fitted to the housing 10 to separate from the housing 10 and create a gap, so that the discharge material in the buffer space 20a can be discharged from the gap to the outside of the battery device 100.

[0105] In some embodiments, referring to Figures 4 to 7, the fixing part 22 includes a main body 221 and a rigid member 222. The main body 221 has a mounting cavity 221a, and at least a portion of the rigid member 222 is disposed within the mounting cavity 221a. The material of the main body 221 is the same as the material of the sealing part 21, and the main body 221 is connected to the sealing part 21.

[0106] The inner wall of the mounting cavity 221a limits the rigid component 222, reducing the probability of relative movement between the rigid component 222 and the main body 221 during the installation of the pressure relief mechanism 20.

[0107] The main body 221 is made of the same material as the sealing part 21, which simplifies the manufacturing process of the pressure relief mechanism 20 and reduces production costs. Furthermore, during the assembly of the pressure relief mechanism 20 into the housing 10, the main body 221 can absorb impacts through elastic deformation, thus playing a buffering role and reducing the probability of damage caused by collisions between the rigid parts 222 and the housing 10.

[0108] It is understandable that after the sealing part 21 undergoes elastic deformation, it exerts a force on the main body part 221, and the main body part 221 then exerts a force on the rigid part 222.

[0109] In some embodiments, the hardness of the material of the rigid component 222 is greater than the hardness of the material of the main body 221.

[0110] Hardness refers to a material's ability to resist the indentation of a hard object into its surface.

[0111] In some embodiments, the elastic modulus of the material of the rigid component 222 is greater than that of the material of the main body 221.

[0112] The elastic modulus refers to the proportionality coefficient between stress and strain in a material during the elastic deformation stage.

[0113] Under the same force, the rigid component 222 has a stronger resistance to deformation than the main body 221. Therefore, the rigid component 222 can support the main body 221, thereby reducing the deformation of the main body 221 under the force of the sealing part 21. This helps to keep the deformation of the sealing part 21 within the design range, and helps to ensure that the pressure required for the discharge to drive the pressure relief mechanism 20 to open meets the design requirements.

[0114] In some embodiments, referring to Figures 4 and 5, the mounting cavity 221a is open to the outside of the battery device 100, and the rigid member 222 can enter the mounting cavity 221a through the open position of the mounting cavity 221a.

[0115] This simplifies the assembly process between the rigid component 222 and the main body 221, improving assembly efficiency; it also allows for external observation of whether there is slippage between the rigid component 222 and the main body 221, facilitating maintenance.

[0116] In some embodiments, referring to Figures 4 to 7, the rigid member 222 is completely located within the mounting cavity 221a.

[0117] In other words, the rigid component 222 will not protrude beyond the open position of the mounting cavity 221a.

[0118] This helps reduce the probability of the rigid component 222 colliding with external objects and moving or even detaching from the main body 221 during daily operation of the battery device 100, and helps extend the service life of the pressure relief mechanism 20.

[0119] In some embodiments, referring to FIG4, the main body 221 can be inserted into the housing 10 along a first direction, and the mounting cavity 221a is open on one side along the first direction to communicate with the outside of the battery device 100.

[0120] The pressure relief structure is fixed to the housing 10 by inserting the main body 221 into the housing 10.

[0121] During the process of assembling the pressure relief mechanism onto the housing 10, the main body 221 can be inserted into the housing 10 first, and then the rigid component 222 can be installed from outside the housing 10 into the mounting cavity 221a.

[0122] In this way, the situation where the main body 221 is difficult to deform and insert into the housing 10 due to the support of the rigid component 222 is avoided. This makes it easier and faster for the main body 221 to be inserted into the housing 10 for fixation, thus improving the installation efficiency of the pressure relief mechanism 20.

[0123] In some embodiments, referring to Figures 4 and 7, the housing 10 is provided with an installation space 10a and an installation hole 10c. The installation space 10a is located inside the housing 10. The installation hole 10c and the discharge hole 10b connect the installation space 10a with the outside of the housing 10. A part of the main body 221 can be inserted into the installation hole 10c and enter the installation space 10a. At least a portion of the surface of the main body 221 perpendicular to the first direction is recessed to form a positioning groove 221b. A part of the housing 10 is embedded in the positioning groove 221b and stops and cooperates with the groove wall of the positioning groove 221b along the first direction.

[0124] Both mounting hole 10c and drain hole 10b are through holes, which helps to simplify the manufacturing process of both.

[0125] Thus, through the limiting effect of the groove wall of the positioning groove 221b and the housing 10 along the first direction, the pressure relief mechanism 20 is kept fixed to the housing 10 along the first direction, which helps to suppress the displacement of the fixing part 22 along the first direction when the discharged material impacts the sealing part 21. The fixing method of the fixing part 22 and the housing 10 is simple and facilitates the installation of the pressure relief mechanism 20.

[0126] In some embodiments, the positioning groove 221b is annular to make the connection between the main body 221 and the housing 10 more stable.

[0127] In some embodiments, the mounting cavity 221a extends through the main body 221 along a first direction. This allows for an increase in the dimension of the rigid component 222 along the first direction, given that the dimension of the main body 221 along the first direction is fixed. This increases the rigidity of the fixing part 22 and makes the overall dimensions of the fixing part 22 more compact. It also helps to reduce the manufacturing size requirements of the mounting cavity 221a.

[0128] In other embodiments, referring to Figures 4 and 5, the side of the mounting cavity 221a closest to the mounting space 10a along the first direction is a closed end.

[0129] In other words, the mounting cavity 221a is isolated from the mounting space 10a, and after the rigid component 222 enters the mounting cavity 221a, it can abut against the bottom wall of the mounting cavity 221a along the first direction.

[0130] Thus, on the one hand, after the battery device 100 experiences thermal runaway, the emissions will not directly impact the rigid component, causing relative movement between the rigid component 222 and the main body 221; on the other hand, the bottom wall of the mounting cavity 221a along the first direction limits the rigid component 222 along the first direction, so that the rigid component 222 can better support the main body 221.

[0131] In some embodiments, referring to FIG7, the minimum distance between the bottom wall of the mounting cavity 221a on the side closest to the mounting space 10a along the first direction and the end face of the portion of the main body 221 located within the mounting space 10a along the first direction is not less than 1 mm. That is, L6 ≥ 1 mm.

[0132] This reduces the probability that the rigid component 222 will penetrate the main body 221 during the insertion of the rigid component 222 into the mounting cavity 221a and after long-term use of the battery device 100, which helps to extend the service life of the pressure relief mechanism 20.

[0133] The specific value of the distance between the bottom wall of the mounting cavity 221a on the side close to the mounting space 10a along the first direction and the end face of the part of the main body 221 located in the mounting space 10a along the first direction can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc.

[0134] In some embodiments, referring to Figures 4 to 7, one end of the rigid member 222 along the first direction is flush with the edge of the open position of the mounting cavity 221a.

[0135] In other words, the rigid component 222 will not protrude outside the mounting cavity 221a, and the edge of the open position of the mounting cavity 221a can also be supported by the rigid component 222.

[0136] In this way, the rigid component 222 can provide support for more areas of the main body 221 along the first direction, thereby better suppressing the deformation of the main body 221 under the force applied by the sealing part 21, and thus helping the deformation of the sealing part 21 to meet the design requirements.

[0137] Understandably, during the process of inserting the main body 221 into the mounting hole 10c, the structure forming the mounting groove needs to deform so that a part of the housing 10 can be embedded into the mounting groove.

[0138] In some embodiments, referring to FIG7, the minimum distance along the first direction between the outer side of the rigid member 222 away from the battery device 100 along the first direction and the end of the portion of the main body 221 located in the mounting space 10a along the first direction is a first distance. The minimum distance along the first direction between the groove wall of the positioning groove 221b close to the mounting space 10a along the first direction and the end of the portion of the main body 221 located in the mounting space 10a along the first direction is a second distance. The first distance is not greater than the second distance. That is, L1≤L2.

[0139] That is, a portion of the rigid component 222 is located on the side of the mounting groove that is perpendicular to the first direction and away from the mounting space 10a.

[0140] It is understandable that, along the first direction, the portion of the main body 221 located on the side of the mounting groove away from the mounting space 10a is completely outside the housing 10.

[0141] In this way, the part of the main body 221 exposed outside the housing 10 can be supported by the main body 221, thereby improving the suppression effect of deformation of the main body 221 under the action of the sealing part 21, which in turn helps to ensure that the deformation of the sealing part 21 meets the design requirements.

[0142] In some embodiments, referring to FIG7, a portion of the rigid component 222 is located within the mounting space 10a. The minimum distance by which the outer side of the rigid component 222, away from the battery device 100, extends beyond the positioning groove 221b along the first direction is a third distance, which is no greater than half of the second distance. That is, L3 ≤ 1 / 2 * L2.

[0143] In this way, the effect of the rigid component 222 on the deformation of the part of the main body 221 that needs to be inserted into the installation space 10a is reduced, which is conducive to the elastic deformation of the part during the process of passing through the installation hole 10c, improving the convenience of inserting the main body 221 into the installation hole 10c and improving the installation efficiency of the pressure relief mechanism 20.

[0144] In some embodiments, referring to FIG7, the portion of the main body 221 inserted into the installation space 10a is a cone.

[0145] This facilitates the smoother insertion of the main body 221 into the installation space 10a, improves the convenience of inserting the main body 221 into the installation hole 10c, and increases the installation efficiency of the pressure relief mechanism 20.

[0146] In some embodiments, referring to FIG7, the outer end of the rigid member 222 away from the battery device 100 along the first direction is a cone.

[0147] This facilitates the insertion of the rigid component 222 into the mounting cavity 221a more smoothly, improving the ease of installation between the rigid component 222 and the main body 221.

[0148] In some embodiments, the main body 221 and the sealing part 21 are an integral structure.

[0149] In other words, the main body 221 and the sealing part 21 can be manufactured simultaneously, and the main body 221 and the sealing part 21 are different parts of the same component.

[0150] In this way, on the one hand, it is beneficial to simplify the manufacturing process of the main body 221 and the sealing part 21 and improve production efficiency; on the other hand, it eliminates the seam between the main body 221 and the sealing part 21 and reduces the probability that the emissions will directly break through the sealing part 21.

[0151] The specific process for achieving the integral structure of the main body 221 and the sealing part 21 is not limited, such as injection molding, compression molding, extrusion molding, additive manufacturing, etc.

[0152] In some embodiments, referring to FIG7, the area where the sealing part 21 connects with the main body part 221 is located on the side of the rigid member 222 perpendicular to the first direction.

[0153] In this way, the rigid component 222 can better suppress the deformation of the main body 221 caused by the sealing part 21, which in turn helps the deformation of the sealing part 21 to meet the design requirements.

[0154] In some embodiments, the material of the main body 221 is one of silicone rubber, fluororubber, and EPDM rubber.

[0155] Silicone rubber is a type of rubber whose main chain consists of alternating silicon and oxygen atoms, with two organic groups typically attached to each silicon atom. Silicone rubber exhibits good low-temperature and heat resistance.

[0156] Fluororubber is a synthetic rubber in which fluorine atoms are present on the carbon atoms of the main chain or side chains. Fluororubber has good heat resistance, oxidation resistance, oil resistance, and corrosion resistance.

[0157] Ethylene propylene diene monomer (EPDM) rubber refers to a terpolymer of ethylene, propylene, and a non-conjugated diene. EPDM rubber exhibits good aging resistance, corrosion resistance, and heat resistance.

[0158] Thus, on the one hand, the main body 221 has good elasticity so as to be installed with the housing 10; on the other hand, it reduces the probability that the main body 221 will be burned and the fixation between it and the housing 10 will fail in the event of thermal runaway of the battery device 100.

[0159] In some embodiments, the rigid component 222 is made of one of polypropylene, polyamide, polycarbonate, or metal.

[0160] Polypropylene (PP) is a semi-crystalline thermoplastic. It has high impact resistance, strong mechanical properties, and good corrosion resistance.

[0161] Polyamide (PA), commonly known as nylon, has good wear resistance and fatigue resistance.

[0162] Polycarbonate (PC) is a high molecular weight polymer containing carbonate groups in its molecular chain. It has good heat resistance and flame retardancy.

[0163] Metals possess high structural strength. The specific type of metal is not limited; examples include stainless steel.

[0164] Thus, by giving the rigid component 222 good structural strength, it is beneficial to reduce the deformation of the rigid component 222 itself under the force applied by the sealing part 21.

[0165] In some embodiments, the material of the fixing part 22 has a higher hardness than the material of the sealing part 21.

[0166] In some embodiments, the elastic modulus of the material of the fixing part 22 is greater than that of the material of the sealing part 21.

[0167] In this way, the rigidity of the solid part is greater than that of the sealing part 21, which helps to keep the deformation of the sealing part 21 within the design range and helps to ensure that the pressure required for the discharge to drive the pressure relief mechanism 20 to open meets the design requirements.

[0168] In some embodiments, the material of the sealing part 21 is one of silicone rubber, fluororubber, and EPDM rubber.

[0169] Thus, on the one hand, the sealing part 21 has good elasticity so as to achieve a sealed fit with the housing 10; on the other hand, it reduces the probability that the sealing part 21 will be burned and thus unable to restrain the direction of emission of the exhaust in the event of thermal runaway of the battery device 100.

[0170] In some embodiments, the fixing part 22 is made of one of polypropylene, polyamide, polycarbonate, or metal.

[0171] Thus, by giving the fixing part 22 good structural strength, it is beneficial to reduce the deformation of the fixing part 22 itself under the force applied by the sealing part 21.

[0172] In some embodiments, the material of the main body 221 is one of silicone rubber, fluororubber, and EPDM rubber.

[0173] In some embodiments, referring to FIG8, the fixing part 22 includes a rigid part 223 and an elastic part 224. The elastic part 224 is disposed at one end of the rigid part 223 along a first direction. The sealing part 21 is connected to the rigid part 223. The housing 10 is provided with an installation space 10a and an installation hole 10c. The installation space 10a is located inside the housing 10. The installation hole 10c and the discharge hole 10b connect the installation space 10a and the outside of the housing 10. The elastic part 224 can generate elastic deformation to be inserted into the installation space 10a through the installation hole 10c. The elastic part 224 stops and cooperates with the inner wall of the installation space 10a along the first direction.

[0174] Thus, through the elastic deformation of the elastic part 224, the elastic part 224 can abut against the inner wall of the installation space 10a after being embedded in the installation space 10a, thereby limiting the pressure relief mechanism 20 and the housing 10 along the first direction.

[0175] In some embodiments, the hardness of the material of the hard portion 223 is greater than the hardness of the material of the sealing portion 21.

[0176] This helps to reduce the deformation of the fixing part 22 under the force of the sealing part 21.

[0177] In some embodiments, the elastic modulus of the material of the rigid portion 223 is greater than that of the material of the sealing portion 21.

[0178] This helps to reduce the deformation of the fixing part 22 under the force of the sealing part 21.

[0179] In some embodiments, the hardness of the material of the hard portion 223 is greater than the hardness of the material of the elastic portion 224.

[0180] In this way, during the process of inserting the elastic part 224 into the mounting hole 10c, the elastic part 224 is deformed by the compression of the rigid part 223 and the housing 10, which improves the convenience of inserting the elastic part 224 into the mounting hole 10c.

[0181] In some embodiments, the elastic modulus of the material of the rigid portion 223 is greater than that of the material of the elastic portion 224.

[0182] In this way, during the process of inserting the elastic part 224 into the mounting hole 10c, the elastic part 224 is deformed by the compression of the rigid part 223 and the housing 10, which improves the convenience of inserting the elastic part 224 into the mounting hole 10c.

[0183] In some embodiments, the elastic part 224 is made of one of silicone rubber, fluororubber, or EPDM rubber.

[0184] In some embodiments, the rigid portion 223 is made of one of polypropylene, polyamide, polycarbonate, or metal.

[0185] The connection method between the rigid part 223 and the elastic part 224 is not limited, such as bonding.

[0186] The connection method between the rigid part 223 and the sealing part 21 is not limited, such as bonding.

[0187] In some embodiments, referring to FIG9, the minimum distance between the end of the rigid portion 223 near the elastic portion 224 along the first direction and the end of the elastic portion 224 away from the rigid portion 223 along the first direction is not less than 1 mm. That is, L7 ≥ 1 mm.

[0188] This reduces the probability that the rigid part 223 will puncture the elastic part 224 during the process of pushing the elastic part 224 into the installation space 10a.

[0189] The specific value of the distance between the end of the hard part 223 that is close to the elastic part 224 along the first direction and the end of the elastic part 224 that is away from the hard part 223 along the first direction can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc.

[0190] In some embodiments, referring to FIG9, a portion of the rigid portion 223 is inserted into the elastic portion 224, and the dimension of the inserted portion along the first direction does not exceed half the dimension of the elastic portion 224 along the first direction. That is, L8 ≤ 1 / 2 * L9.

[0191] In this way, the effect of the rigid part 223 on the deformation of the elastic part 224 is reduced, which is conducive to the elastic deformation of the part during the process of passing through the mounting hole 10c, improving the convenience of inserting the elastic part 224 into the mounting hole 10c and improving the installation efficiency of the pressure relief mechanism 20.

[0192] In some embodiments, referring to FIG9, the end of the elastic portion 224 away from the rigid portion 223 along the first direction is a cone.

[0193] This makes it easier for the elastic part 224 to be inserted into the mounting hole 10c.

[0194] In some embodiments where one end of the elastic portion 224 is a cone, referring to FIG9, one end of the rigid portion 223 along the first direction is inserted into the elastic portion 224 and is a cone.

[0195] In this way, the shape of the end of the elastic part 224 away from the rigid part 223 is adapted to the shape of the rigid part 223 located within the elastic part 224, reducing the inhibitory effect of the rigid part 223 on the deformation of the elastic part 224 during the insertion of the elastic part 224 into the mounting hole 10c. This facilitates the elastic deformation of the part during the process of passing through the mounting hole 10c, improves the convenience of inserting the elastic part 224 into the mounting hole 10c, and improves the installation efficiency of the pressure relief mechanism 20.

[0196] In some embodiments, referring to Figures 4 to 9, the fixing part 22 extends along the first direction, and the sealing part 21 is arranged around the periphery of the fixing part 22 perpendicular to the first direction. The end of the sealing part 21 that is perpendicular to the first direction and away from the fixing part 22 is closer to the first end of the fixing part 22 than the end that is closer to the fixing part 22. The first end can be fixed to the housing 10.

[0197] In other words, the sealing part 21 is inclined, and the end away from the fixing part 22 is closer to the box body 10.

[0198] This allows the end of the sealing part 21 furthest from the fixing part 22 to be deformed by the pre-tightening force of the box body 10 during the installation of the fixing part 22 and the box body 10 in the first direction. By applying the pre-tightening force to the sealing part 21, the sealing part 21 and the box body 10 are kept in contact during normal use of the battery device 100, reducing the probability of the sealing part 21 separating from the box body 10 due to factors such as collisions during normal use of the battery device 100, and helping to maintain the airtightness of the internal space of the box body 10.

[0199] In some embodiments where a main body portion 221 is provided, a portion of the main body portion 221 forms the first end of the fixing portion 22.

[0200] In some embodiments where an elastic portion 224 is provided, the elastic portion 224 forms the first end of the fixing portion 22.

[0201] In some embodiments, referring to Figures 7 and 9, the housing 10 is provided with a mounting hole 10c, which is open on one side along a first direction to communicate with the outside of the housing 10. A first end can be inserted into the mounting hole 10c. The fixing part 22 is provided with a stop surface 22a, which is located outside the housing 10 and can stop and cooperate with the housing 10 along the first direction. The minimum distance along the first direction between the end of the sealing part 21 perpendicular to the first direction away from the fixing part 22 and the end face of the first end is a fourth distance. The minimum distance along the first direction between the stop surface 22a and the end face of the first end is a fifth distance. The fourth distance is less than the fifth distance. That is, L4 < L5.

[0202] Thus, the stop surface 22a can limit the insertion depth of the fixing part 22 in the mounting hole 10c. At the same time, when the stop surface 22a abuts against the housing 10, the sealing part 21 and the housing 10 achieve a sealing fit and undergo elastic deformation, which helps to improve the installation convenience of the pressure relief mechanism 20.

[0203] In some embodiments where a positioning groove 221b is provided, referring to FIG7, the positioning groove 221b forms a stop surface 22a on one side of the groove wall along the first direction.

[0204] In some embodiments where a rigid portion 223 is provided, referring to FIG9, a stop surface 22a is formed on the surface of the connection area between the sealing portion 21 and the rigid portion 223 along the first direction near one end of the elastic portion 224.

[0205] The battery device 100 in one embodiment of this disclosure is described in detail below:

[0206] The battery device 100 includes a housing 10 and a pressure relief mechanism 20. The housing 10 includes a mounting space 10a, a discharge port 10b, and a mounting hole 10c. The discharge port 10b communicates with the outside of the housing 10. The pressure relief mechanism 20 includes a fixing part 22 and a sealing part 21. The fixing part 22 is fixed to the housing 10, and the sealing part 21 covers the housing 10 along a first direction and is located on the outside of the housing 10. At least a portion of the sealing part 21 is capable of elastic deformation and seals against the housing 10 to isolate the discharge port 10b from the outside of the battery device 100. The fixing part 22 is connected, and the rigidity of the fixing part 22 is greater than that of the sealing part 21. The fixing part 22 includes a main body 221 and a rigid member 222. The main body 221 has a mounting cavity 221a. At least a portion of the rigid member 222 is disposed in the mounting cavity 221a. The main body 221 is connected to the sealing part 21. The material of the main body 221 is the same as that of the sealing part 21. The hardness of the material of the rigid member 222 is greater than that of the material of the main body 221. The elastic modulus of the material of the rigid member 222 is greater than that of the material of the main body 221. The mounting cavity 221a is open to the outside of the battery device 100, and the rigid member 222 can enter the mounting cavity 221a through the open position of the mounting cavity 221a. The rigid member 222 is completely located within the mounting cavity 221a. The main body 221 can be inserted into the housing 10 in a first direction, and the mounting cavity 221a is open in one direction to communicate with the outside of the battery device 100. The mounting space 10a is located inside the housing 10. The mounting hole 10c and the discharge hole 10b connect the mounting space 10a to the outside of the housing 10. A portion of the main body 221 can be inserted into the mounting hole 10c into the mounting space 10a. At least a portion of the surface of the main body 221 perpendicular to the first direction is recessed to form a positioning groove 221b. A portion of the housing 10 is embedded in the positioning groove 221b and stops with the groove wall of the positioning groove 221b along the first direction. The side of the mounting cavity 221a closest to the mounting space 10a along the first direction is a closed end. The minimum distance between the bottom wall of the mounting cavity 221a closest to the mounting space 10a along the first direction and the end face of the portion of the main body 221 located in the mounting space 10a along the first direction is not less than 1 mm. One end of the rigid member 222 along the first direction is flush with the edge of the open position of the mounting cavity 221a. The minimum distance along the first direction between the outer side of the rigid component 222 away from the battery device 100 and the end of the portion of the main body 221 located in the mounting space 10a is the first distance. The minimum distance along the first direction between the groove wall of the positioning groove 221b close to the mounting space 10a and the end of the portion of the main body 221 located in the mounting space 10a is the second distance. The first distance is not greater than the second distance.A portion of the rigid component 222 is located within the mounting space 10a. The minimum distance by which the outer side of the rigid component 222, away from the battery device 100, extends beyond the positioning groove 221b along the first direction is a third distance, which is no greater than half of the second distance. The portion of the main body 221 inserted into the mounting space 10a is conical; the outer end of the rigid component 222, away from the battery device 100 along the first direction, is also conical. The main body 221 and the sealing portion 21 are integrally formed. The area where the sealing portion 21 connects to the main body 221 is located on the side of the rigid component 222 perpendicular to the first direction. The material of the main body 221 is one of silicone rubber, fluororubber, and EPDM rubber; the material of the rigid component 222 is one of polypropylene, polyamide, polycarbonate, and metal. The material of the sealing portion 21 is one of silicone rubber, fluororubber, and EPDM rubber. The fixing part 22 extends along the first direction, and the sealing part 21 is arranged around the fixing part 22 perpendicular to the first direction. The end of the sealing part 21 perpendicular to the first direction away from the fixing part 22 is closer to the first end of the fixing part 22 than the end of the sealing part 21 that is closer to the fixing part 22 along the first direction. The first end can be fixed to the housing 10. The housing 10 is provided with a mounting hole 10c, which is open on one side along the first direction to communicate with the outside of the housing 10. The first end can be inserted into the mounting hole 10c. The fixing part 22 is provided with a stop surface 22a, which is located outside the housing 10 and can stop and cooperate with the housing 10 along the first direction. The minimum distance along the first direction between the end of the sealing part 21 perpendicular to the first direction away from the fixing part 22 and the end face of the first end is a fourth distance, and the minimum distance along the first direction between the stop surface 22a and the end face of the first end is a fifth distance. The fourth distance is less than the fifth distance.

[0207] This disclosure also provides an energy storage device, which includes any of the battery devices 100 described in the foregoing embodiments.

[0208] This allows the pressure relief mechanism 20 to open at the appropriate time to release emissions in the event of thermal runaway of the battery device 100, reducing the risk of the battery device 100 causing further damage to other components in the energy storage device.

[0209] This disclosure also provides an electrical device, referring to Figures 1 and 2, wherein the energy storage device includes any of the battery devices 100 in the foregoing embodiments or the energy storage devices in the foregoing embodiments.

[0210] This allows the pressure relief mechanism 20 to open at the appropriate time to release emissions in the event of thermal runaway of the battery device 100, reducing the risk of the battery device 100 causing further damage to other components in the electrical device.

[0211] In some embodiments, the electrical device includes an aircraft.

[0212] Aircraft generally refer to any device that flies within or outside the atmosphere (space), and can include both atmospheric aircraft and spacecraft. Aircraft can include airplanes, airships, etc., and for example, low-altitude aircraft, eVTOL (electric vertical take-off and landing) aircraft, commuter aircraft, regional aircraft, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft.

[0213] This helps the aircraft maintain normal operation even in the event of thermal runaway of the battery system.

[0214] The various embodiments / implementations provided in this disclosure can be combined with each other without creating contradictions.

[0215] The above are merely preferred embodiments of this disclosure and are not intended to limit the embodiments therein. Those skilled in the art will recognize various modifications and variations of the embodiments of this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this disclosure should be included within the protection scope of the embodiments of this disclosure. Industrial applicability

[0216] This disclosure provides a battery device, an energy storage device, and an electrical device, which helps to reduce the difference between the actual deformation of the sealing part and the deformation required by the design, and helps the pressure relief mechanism to open at the appropriate time to release emissions.

Claims

1. A battery device, wherein, The battery device includes: The housing includes a discharge port that communicates with the outside of the housing; The pressure relief mechanism includes a fixing part and a sealing part. The fixing part is fixed to the housing, and the sealing part is disposed on the housing along a first direction and located outside the housing. At least a portion of the sealing part is capable of elastic deformation and sealingly fitting with the housing to isolate the discharge port from the outside of the battery device. The sealing part is connected to the fixing part, and the stiffness of the fixing part is greater than that of the sealing part.

2. The battery device according to claim 1, wherein, The fixing part includes a main body and a rigid component. The main body has a mounting cavity, and at least a portion of the rigid component is disposed in the mounting cavity. The main body is connected to the sealing part. The material of the main body is the same as the material of the sealing part, and the hardness of the material of the rigid component is greater than the hardness of the material of the main body. And / or, the elastic modulus of the material of the rigid component is greater than the elastic modulus of the material of the main body.

3. The battery device according to claim 2, wherein, The mounting cavity is open to the outside of the battery device, and the rigid component can enter the mounting cavity through the open position of the mounting cavity.

4. The battery device according to claim 3, wherein, The rigid component is located entirely within the mounting cavity.

5. The battery device according to claim 3 or 4, wherein, The main body can be inserted into the housing along the first direction, and the mounting cavity is open on one side along the first direction to communicate with the outside of the battery device.

6. The battery device according to claim 5, wherein, The housing is provided with an installation space and an installation hole. The installation space is located inside the housing. The installation hole and the discharge hole connect the installation space to the outside of the housing. A portion of the main body can be inserted into the installation hole and enter the installation space. At least a portion of the surface of the main body perpendicular to the first direction is recessed to form a positioning groove. A portion of the housing is embedded in the positioning groove and stops and cooperates with the groove wall of the positioning groove along the first direction.

7. The battery device according to claim 6, wherein, The mounting cavity is closed on the side closest to the mounting space along the first direction.

8. The battery device according to claim 7, wherein, The minimum distance between the bottom wall of the mounting cavity on the side closest to the mounting space along the first direction and the end face of the part of the main body located in the mounting space along the first direction is not less than 1 mm.

9. The battery device according to any one of claims 6 to 8, wherein, One end of the rigid component along the first direction is flush with the edge of the open position of the mounting cavity.

10. The battery device according to any one of claims 6 to 9, wherein, The minimum distance along the first direction between the outer side of the rigid component away from the battery device along the first direction and the end of the portion of the main body located in the mounting space along the first direction is the first distance. The minimum distance along the first direction between the groove wall of the positioning groove on the side of the mounting space along the first direction and the end of the portion of the main body located in the mounting space along the first direction is the second distance. The first distance is not greater than the second distance.

11. The battery device according to claim 10, wherein, A portion of the rigid component is located within the mounting space. The minimum distance by which the rigid component extends beyond the positioning groove along the first direction from the outer side of the battery device is a third distance, and the third distance is not greater than half of the second distance.

12. The battery device according to claim 10 or 11, wherein, The portion of the main body inserted into the installation space is a cone; And / or, the end of the rigid member on the outer side away from the battery device along the first direction is a cone.

13. The battery device according to any one of claims 2 to 12, wherein, The main body and the sealing part are an integral structure.

14. The battery device according to any one of claims 2 to 13, wherein, The area where the sealing part connects to the main body is located on the side of the rigid component perpendicular to the first direction.

15. The battery device according to any one of claims 2 to 14, wherein, The material of the main body is one of silicone rubber, fluororubber, and EPDM rubber. And / or, the material of the rigid component is one of polypropylene, polyamide, polycarbonate, or metal.

16. The battery device according to claim 1, wherein, The hardness of the material of the fixing part is greater than the hardness of the sealing part; And / or, the elastic modulus of the material of the fixing part is greater than the elastic modulus of the material of the sealing part.

17. The battery device according to claim 16, wherein, The material of the sealing part is one of silicone rubber, fluororubber, and EPDM rubber; And / or, the material of the fixing part is one of polypropylene, polyamide, polycarbonate, or metal.

18. The battery device according to claim 1, wherein, The fixing part includes a rigid part and an elastic part. The elastic part is disposed at one end of the rigid part along the first direction. The sealing part is connected to the rigid part. The housing is provided with an installation space and an installation hole. The installation space is located inside the housing. The installation hole and the discharge hole connect the installation space and the outside of the housing. The elastic part can generate elastic deformation to be inserted into the installation space through the installation hole. The elastic part stops and cooperates with the inner wall of the installation space along the first direction. The hardness of the material of the rigid part is greater than the hardness of the material of the sealing part. And / or, the elastic modulus of the material of the rigid part is greater than the elastic modulus of the material of the sealing part.

19. The battery device according to claim 18, wherein, The hardness of the material in the rigid part is greater than the hardness of the material in the elastic part; And / or, the elastic modulus of the material of the rigid part is greater than the elastic modulus of the material of the elastic part.

20. The battery device according to claim 18 or 19, wherein, The minimum distance between the end of the rigid portion close to the elastic portion along the first direction and the end of the elastic portion away from the rigid portion along the first direction is not less than 1 mm.

21. The battery device according to any one of claims 18 to 20, wherein, A portion of the rigid part is inserted into the elastic part, and the dimension of the inserted portion along the first direction does not exceed half the dimension of the elastic part along the first direction.

22. The battery device according to any one of claims 18 to 21, wherein, The end of the elastic part away from the rigid part along the first direction is a cone, and the end of the rigid part along the first direction is inserted into the elastic part and is also a cone.

23. The battery device according to any one of claims 1-22, wherein, The fixing part extends along the first direction, and the sealing part is arranged around the fixing part on the periphery perpendicular to the first direction. The end of the sealing part that is perpendicular to the first direction and away from the fixing part is closer to the first end of the fixing part along the first direction than the end that is closer to the fixing part. The first end can be fixed to the housing.

24. The battery device according to any one of claims 23, wherein, The housing is provided with a mounting hole, which is open on one side along the first direction to communicate with the outside of the housing. The first end can be inserted into the mounting hole. The fixing part is provided with a stop surface, which is located outside the housing and can stop and cooperate with the housing along the first direction. The minimum distance along the first direction between the end of the sealing part perpendicular to the first direction away from the fixing part and the end face of the first end is a fourth distance. The minimum distance along the first direction between the stop surface and the end face of the first end is a fifth distance. The fourth distance is less than the fifth distance.

25. An energy storage device, wherein, Includes the battery device according to any one of claims 1 to 24.

26. An electrical appliance, wherein, Includes the battery device according to any one of claims 1 to 24 or the energy storage device according to claim 25.

27. The electrical appliance according to claim 26, wherein, The electrical equipment includes aircraft.

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