Battery cell, battery device, electric device, and energy storage device

Abstract

This application provides a battery cell, a battery device, an electrical device, and an energy storage device, belonging to the field of batteries. The battery cell includes a casing, an insulating component, and a mass block. The insulating component is housed within the casing and has a channel extending perpendicular to the direction of gravity of the casing. The mass block is housed within the channel and configured to reciprocate relative to the insulating component along the channel. The reciprocating motion of the mass block absorbs and dissipates vibration energy, causing vibration energy attenuation. This reduces the possibility of electrode assembly vibration, mitigating battery performance failure caused by electrode assembly vibration damage.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, electrical equipment, and energy storage device. Background Technology

[0002] Energy conservation and emission reduction are crucial for sustainable social development. Batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a critical factor in its development.

[0003] Electrical equipment or energy storage devices inevitably vibrate during use or transportation. This vibration is transmitted to the battery, causing damage to the internal electrode components, which can easily lead to battery performance failure or create a risk of thermal runaway. Summary of the Invention

[0004] This application aims to at least solve one of the technical problems existing in the background art. To this end, one object of this application is to provide a battery cell, battery device, electrical device, and energy storage device that reduces the possibility of vibration damage to the electrode assembly due to external vibration, thereby mitigating problems such as battery performance failure or thermal runaway caused by vibration damage to the electrode assembly.

[0005] An embodiment of the first aspect of this application provides a battery cell, including: a housing, an insulating member, and a mass block. The insulating member is housed within the housing and has a channel therein, the channel extending perpendicular to the direction of gravity of the housing. The mass block is housed within the channel and is configured to reciprocate relative to the insulating member along the channel.

[0006] In the technical solution of this application embodiment, a channel is provided inside the insulating component, and a mass block is provided inside the channel. The mass block can reciprocate along the channel. The reciprocating motion of the mass block can absorb and dissipate vibration energy, thereby attenuating the vibration energy. As a result, the possibility of electrode assembly vibration can be reduced, which can reduce the probability of external vibration damaging the electrode assembly to a certain extent, thereby alleviating problems such as battery performance failure caused by electrode assembly damage.

[0007] In some embodiments, the insulating member is configured to include: a body portion and a cover, the body portion having a channel having a first end and a second end along its own extending direction, at least one of the first end and the second end penetrating the surface of the body portion and forming an opening, the opening being configured to allow a mass block to pass through; the cover is assembled and connected to the body portion, the number of cover portions being the same as the number of openings, each cover portion corresponding to one opening, the cover portion blocking at least a portion of the corresponding opening to restrict the mass block from detaching from the channel through the corresponding opening.

[0008] In this embodiment, an opening is formed during the fabrication of the main body, allowing the mass block to be inserted into the channel through the opening. This eliminates the need for additional through holes for mounting the mass block, simplifying the fabrication process of the battery cell.

[0009] In some embodiments, the cover completely seals the corresponding opening. This embodiment prevents the channel from communicating with the space inside the housing, thus reducing the impact of electrolyte fluctuations outside the channel on the mass block and enabling the damper to have stable vibration reduction performance.

[0010] In some embodiments, the cover is sealed to the body. This improves the sealing of the opening, reliably preventing communication between the passage and the interior space of the housing.

[0011] In some embodiments, the cover is non-detachably connected to the main body. In this embodiment, the cover is prevented from separating from the main body under the impact of the mass block, allowing the cover to reliably cover the opening and effectively prevent the mass block from leaving the channel.

[0012] In some embodiments, a damping element is provided within the channel to provide resistance to the mass block, thereby slowing down the mass block's movement speed along the channel. This technical solution widens the vibration reduction frequency range of the damper composed of the insulator, mass block, and damping element, allowing it to be used to reduce vibrations over a wider frequency range.

[0013] In some embodiments, the damping element includes a damping fluid that fills the channel.

[0014] In some embodiments, the damping element includes an elastic element, one end of which is connected to the mass block and the other end to an insulating element. The elastic element can also provide a restoring force to the mass block, enabling the mass block to remain in a preset position. Using this technical solution, the mass block can move along the channel from the preset position as a starting point, and the natural frequency of the damper is relatively more stable.

[0015] In some embodiments, the insulating element has multiple channels, with at least two channels extending in different directions. In this embodiment, each mass block can absorb a portion of the vibrational energy in the same direction of motion, which can benefit the stability of the electrode assembly in complex vibration environments.

[0016] In some embodiments, the housing includes an outer peripheral wall and an end wall, the outer peripheral wall being connected around the end wall; the battery cell also includes an electrode assembly and a support member housed within the housing, at least a portion of the support member being located between the electrode assembly and the end wall of the housing, the support member contacting the end face of the electrode assembly facing the end wall; the support member serves as an insulating member. Using this technical solution, the battery cell with the support member can reduce the vibration of the electrode assembly without reducing the volumetric energy density.

[0017] In some embodiments, the battery cell further includes an electrode assembly and an end cap assembly. The electrode assembly is housed within a housing, and the end cap assembly includes an end cap and a lower plastic layer. The end cap closes to the opening of the housing, and the lower plastic layer is disposed on the side of the end cap facing the electrode assembly and abuts against the electrode assembly. The lower plastic layer serves as an insulating element. Using this technical solution, the battery cell with the lower plastic layer can reduce the vibration of the electrode assembly without reducing the volumetric energy density.

[0018] In some embodiments, the lower plastic portion includes a first part and a second part connected together, wherein the dimension of the first part along the direction of gravity is smaller than the dimension of the second part along the direction of gravity, and a channel is disposed in the second part. This is beneficial for giving the lower plastic portion higher structural strength and stiffness, thereby reducing the possibility of deformation and enabling the mass block inside the lower plastic portion to stably perform its vibration damping function.

[0019] In some embodiments, the battery cell further includes an electrode assembly housed within a casing, wherein the dimension of the insulating component along the direction of gravity accounts for 1% to 5% of the dimension of the electrode assembly along the direction of gravity. This embodiment facilitates the processing of the insulating component while ensuring excellent volumetric energy density.

[0020] In some embodiments, the dimension of the channel along the gravity direction accounts for 60% to 90% of the dimension of the insulating element along the gravity direction. This embodiment can better balance the vibration reduction effect and the reliability of the vibration reduction action.

[0021] In some embodiments, the maximum dimension of the mass block along the direction of gravity accounts for 80% to 95% of the dimension of the channel along the direction of gravity. In this embodiment, the mass block and the channel are fitted with a clearance, allowing the mass block to reciprocate within the channel.

[0022] In some embodiments, the coefficient of friction between the mass block and the insulating component is less than 0.2. This technical solution ensures smooth and unobstructed movement of the mass block within the channel, enabling the mass block to effectively perform its vibration damping function.

[0023] In some embodiments, the mass of all mass blocks is the first mass, and the mass of the battery cell is the total mass, with the first mass accounting for 0.4% to 2% of the total mass. This embodiment can better balance vibration reduction and gravimetric energy density.

[0024] In some embodiments, the mass block is a mass sphere with a cross-section perpendicular to the extension direction of the channel. The cross-section of the channel is circular, and the channel is adapted to fit the mass sphere. In this embodiment, the mass block moves along the channel in a rolling or rolling-sliding manner, making the movement of the mass block smoother and more fluid, so that the mass block can effectively perform its vibration damping function.

[0025] In some embodiments, the insulating element is made of a rigid material. This improves the structural strength and stiffness of the insulating element, reducing the likelihood of deformation under pressure from the electrode assembly, and thus minimizing the possibility of channel collapse to ensure stable vibration damping.

[0026] An embodiment of the second aspect of this application provides a battery device that includes the battery cell described in the above embodiments.

[0027] An embodiment of the third aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0028] An embodiment of the fourth aspect of this application provides an energy storage device that includes the battery device described above, the battery device being capable of storing and providing electrical energy.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0031] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0032] Figure 2 This is an exploded view of the battery device according to some embodiments of this application;

[0033] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;

[0034] Figures 4 to 7 This is a schematic diagram of the structure of the support member according to some embodiments of this application;

[0035] Figure 8 This is a schematic diagram of the structure of the lower plastic in some embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1000 vehicles;

[0038] Battery unit 100, controller 200, motor 300;

[0039] Battery cell assembly 10, battery cell 11, housing 110, electrode assembly 120, end cap assembly 130, end cap 131, lower plastic 132, first part 1321, second part 1322, second surface 1322a, side surface 1322b, support member 140, insulating member 150, main body 151, cover 152, channel 153, damping member 154, mass block 155;

[0040] Box 20, first box 21, second box 22. Detailed Implementation

[0041] 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.

[0042] 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 this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] 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 specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0044] 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.

[0045] In the description of the embodiments in this application, 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 have an "or" relationship.

[0046] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0047] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "linking", 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 connection of two components or the interaction between two components.

[0049] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0050] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0051] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" may mean that other components not listed may also be included, or that only the listed components may be included. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0052] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0053] Electrical equipment or energy storage devices inevitably vibrate during use or transportation. This vibration is transmitted to the battery, causing the internal electrode components to vibrate and become damaged (e.g., active material detachment, loosening of the connection between the tabs and electrode terminals), leading to battery performance failure. In severe cases, it may even cause internal short circuits, creating a potential risk of thermal runaway.

[0054] To mitigate the impact of external vibrations on the electrode assembly, some related technologies employ a thermofused base plate to fix the electrode assembly to the casing. This increases the rigidity of the electrode assembly, thus reducing the impact of external vibrations. However, in this method, the bottom of the electrode assembly is completely confined by the thermofused connection. This prevents the release of expansion stress during battery charging and discharging, leading to a risk of damage and cracking of the electrode sheets or separator. This could still cause internal short circuits, resulting in battery performance failure or the potential for thermal runaway.

[0055] Based on the above considerations, this application designs a battery cell with a channel formed by an insulating component inside the casing, and a mass block that can reciprocate along the channel. In such a battery cell, the reciprocating motion of the mass block can absorb and dissipate vibration energy, causing the vibration energy to decay. This is equivalent to transferring some of the vibration to the mass block, which can effectively reduce the vibration of the electrode assembly.

[0056] The battery cells and battery devices described in this application can be used, but are not limited to, in electrical equipment or energy storage devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices described in this application can be used to construct such electrical equipment or energy storage devices.

[0057] The energy storage device utilizing a battery as a power system in this application embodiment can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output it at appropriate times. For example, the 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 device provided in this application embodiment can be used in any power system that requires energy storage.

[0058] In some embodiments, the energy storage device is an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0059] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet. Each battery cluster may include multiple battery units connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, these clusters are connected in parallel to increase the capacity of the energy storage device.

[0060] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0061] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0062] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. 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. A battery device 100 is provided inside the vehicle 1000, and 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 starting, navigation, and driving.

[0063] In some embodiments of this application, 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.

[0064] Figure 2 A schematic diagram of the structure of a battery device 100 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or mixed connection via a busbar.

[0065] In some embodiments, the battery cell assembly 10 is typically formed by arranging a plurality of battery cells 11.

[0066] As an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 11 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 11 together with cable ties.

[0067] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 20 and one or more individual battery cells 10, with the individual battery cells 10 housed within the housing 20. The housing 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of combinations of simple cuboids, cylinders, or spheres. The material of the housing 20 can be an alloy such as aluminum alloy or iron alloy, a polymer such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0068] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the housing 20 by fixing the battery module in the housing 20.

[0069] As an example, the battery cell assembly 10 can also be housed in the housing 20 by directly fixing multiple battery cells 11 to the housing 20.

[0070] As an example, the housing 20 may include a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are fastened together to form a closed space inside the housing 20 to house the battery cell assembly 10. Here, "closed" refers to covering or closing, and can be either non-sealed or sealed to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11. The first housing 21 may be a top cover or a bottom plate.

[0071] As an example, the housing 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 20 forms an enclosed space to house the battery cell assembly 10.

[0072] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0073] The battery cell 11 provided in the embodiments of this application can be a secondary battery. A secondary battery refers to a battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0074] The battery cell 11 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 this application embodiment is not limited to this. As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell 11 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc., and this application has no particular limitation.

[0075] like Figure 3 As shown, the battery cell 11 provided in the embodiments of this application includes a casing, an electrode assembly, and an electrolyte. The electrode assembly is the component in the battery cell where the electrochemical reaction occurs. The electrode assembly and the electrolyte are housed within the casing. As an example, the electrolyte can be a liquid electrolyte, a gel state, or a solid state.

[0076] An electrode assembly (also known as a battery cell or bare cell (Jelly Roll, JR)) is the component in a battery cell where electrochemical reactions occur. The casing may contain one or more electrode assemblies. An electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) move back and forth between the positive and negative electrode plates, inserting and extracting. The separator, positioned between the positive and negative electrode plates, prevents short circuits while allowing active ions to pass through. Electrode assemblies can be wound, stacked, or a hybrid of both.

[0077] As examples, the outer casing can be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film. In some embodiments, the outer casing can be a sealed structure or a non-sealed structure. As an example, when the outer casing is a non-sealed structure, it serves to protect the electrode assembly, and a sealing bag is included between the outer casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0078] As an example, the housing includes a housing and an end cap assembly. The housing has an opening, and the end cap assembly closes onto the opening of the housing. The housing and the end cap assembly together enclose a mounting cavity that provides mounting space for components such as electrode assemblies.

[0079] The housing is a component used to cooperate with the end cap assembly to form the internal environment of a battery cell, wherein the formed internal environment can accommodate electrode components, electrolyte, and other components. The housing can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing can be determined according to the specific shape and size of the electrode components. The housing can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0080] Please see Figures 4 to 8 The battery cell 11 provided in this embodiment further includes an insulating member 150 and a mass block 155. The insulating member 150 is housed within a housing 110, and a channel 153 is provided within the insulating member 150. The extending direction of the channel 153 is perpendicular to the direction of gravity of the housing 110. The mass block 155 is housed within the channel 153 and is configured to reciprocate relative to the insulating member 150 along the channel 153.

[0081] The insulating element 150 is a component made of insulating material with high resistivity, and is insulated from the housing 110 and electrode assembly 120 or other components within the housing 110. In some embodiments, the insulating element 150 may further be made of a corrosion-resistant insulating material. Exemplarily, the material of the insulating element 150 may be ceramic, mica, polymer insulating materials (e.g., polyimide (PI), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polypropylene (PP), polycarbonate (PC)) or combinations thereof. Thus, when the electrolyte is a liquid electrolyte, the insulating element 150 has good corrosion resistance, enabling it to function stably in the electrolyte. The insulating element 150 may be cuboid, cylindrical, etc., and this embodiment is not specifically limited in this regard.

[0082] The direction of gravity can refer to the direction in which the weight of the casing 110 points when the battery cell 11 is installed in the battery device 100. For example, the direction of gravity can be seen in the height direction of the battery cell 11 (see [reference]). Figure 3 (Z-direction). In the case that the electrode assembly 120 is a wound structure, the direction of gravity can also be referred to the axial direction of the electrode assembly 120.

[0083] The extension direction of channel 153 is perpendicular to the direction of gravity of housing 110; in other words, the extension direction of channel 153 is parallel to the XY plane. When housing 110 is cuboid in shape, the X direction can be referred to as the length direction of housing 110, and the Y direction can be referred to as the width direction of housing 110 or the thickness direction of electrode assembly 120. For example, as... Figure 5 As shown, the extension direction of channel 153 can be parallel to the X direction. Or, as... Figure 4As shown, the extension direction of channel 153 can be parallel to the Y direction. Alternatively, the extension direction of channel 153 can be set at an angle to both the X and Y directions. Channel 153 has a first end and a second end along its own extension direction.

[0084] Mass block 155 is a rigid body with a certain mass. The material of mass block 155 can be metal, polymer, or a combination thereof. The movement of mass block 155 within channel 153 can be either sliding or rolling. Channel 153 can accommodate one mass block 155, or multiple mass blocks 155 can be accommodated within channel 153, with the multiple mass blocks 155 arranged sequentially along the extending direction of channel 153.

[0085] In this embodiment, the electrical device or energy storage device composed of battery cells 11 vibrates under external excitation during application or transportation. This vibration is transmitted to the battery cells 11 and then to the insulating component 150. Under the influence of the vibration, the mass block 155 moves relative to the insulating component 150. The mass block 155 moves along the channel 153 and generates inertial force, which can cancel out the excitation force in the opposite direction. This allows some of the vibration energy to be transferred to the movement of the mass block 155. Furthermore, friction and heat are generated as the mass block 155 moves within the channel 153, causing some of the vibration energy to be dissipated through friction and conversion into heat. The excitation force can be understood as the force applied to the battery cells 11 that causes them to vibrate.

[0086] It should be understood that, under the influence of vibration, the mass block 155 can move back and forth between the two ends of the channel 153, that is, the mass block 155 moves from the first end to the second end or from the second end to the first end. In other words, the movement path of the mass block 155 is the entire channel 153. In other embodiments, the movement path of the mass block 155 may also be a portion of the channel 153.

[0087] In the battery cell 11 of this embodiment, a channel 153 is provided within the insulating member 150, and a mass block 155 is provided within the channel 153. The mass block 155 can reciprocate along the channel 153. The reciprocating motion of the mass block 155 can absorb and dissipate vibration energy, thereby attenuating the vibration energy. As a result, the possibility of vibration of the electrode assembly 120 can be reduced, which can reduce the probability of external vibration causing damage to the electrode assembly 120 to a certain extent, thereby alleviating problems such as battery performance failure and thermal runaway caused by damage to the electrode assembly 120.

[0088] Moreover, compared with the technical solution of fixing the electrode assembly 120 to the housing 110 by a hot-melt bottom plate, in the technical solution of this embodiment, the bottom end of the electrode assembly 120 is not completely rigid. During the charging and discharging process of the battery cell 11, the expansion stress of the electrode assembly 120 can still be released, which can also avoid the problem of damage caused by the inability to release the expansion stress of the electrode assembly 120.

[0089] According to some embodiments of this application, please refer to Figure 7 The channel 153 may also be provided with a damping element 154, which is used to provide resistance to the mass block 155 to slow down the movement speed of the mass block 155 along the channel 153.

[0090] The damping element 154 is a component that dampens the mass block 155. When the mass block 155 moves, the damping element 154 generates resistance and applies it to the mass block 155. The resistance is opposite to the direction of movement of the mass block 155, thus reducing the speed of the mass block 155 along the channel 153. Specifically, when the mass block 155 moves towards the first end, the resistance is parallel to the extension direction of the channel 153 and points from the first end to the second end; when the mass block 155 moves towards the second end, the resistance is parallel to the extension direction of the channel 153 and points from the second end to the first end.

[0091] In this embodiment, the insulating component 150, the mass block 155, and the damping component 154 are combined to form a damper, and the damper is used to reduce vibration.

[0092] It is understood that the electrical equipment or energy storage device composed of the battery cells 11 in this embodiment is subjected to complex vibrations during application or transportation, and the vibrations typically have multiple frequencies. By applying resistance to the mass block 155, the movement speed of the mass block 155 decreases, meaning the movement of the mass block 155 becomes smoother. This helps to widen the damping frequency range of the damper, making it suitable for reducing vibrations over a wider frequency range, thereby benefiting the stability of the electrode assembly 120 in complex vibration environments.

[0093] Furthermore, by introducing the damping element 154, when the movement path of the mass block 155 is the entire channel 153, the impact degree between the mass block 155 and the insulating element 150 can be reduced, which helps to reduce the possibility of impact vibration caused by the mass block 155 violently impacting the insulating element 150, and also helps to reduce the noise generated by the collision between the mass block 155 and the insulating element 150.

[0094] There are various ways to implement the damping element 154. The specific structure of the damping element 154 will be described in detail below.

[0095] According to some embodiments of this application, the damping member 154 may include an elastic member, one end of which is connected to the mass block 155 and the other end of which is connected to the insulating member 150. The elastic member can also provide a restoring force to the mass block 155, so that the mass block 155 can be held in a preset position.

[0096] The elastic element can be a component with an elastic structure, such as a spring, rubber, etc. Figure 7 The spring and other components shown are illustrated. Taking a spring as an example, which is an elastic element, as shown... Figure 7 As shown, the extension direction of the spring can be parallel to the extension direction of channel 153. The two ends of the elastic element along the extension direction of channel 153 are respectively connected to the mass block 155 and the insulating element 150, and the connection method can be at least one of the following: screw connection, snap-fit, adhesive connection, interference fit, etc. Each channel 153 can accommodate one elastic element, or, please continue reading... Figure 7 Each channel 153 can accommodate two elastic elements, which are located on both sides of the mass block 155.

[0097] In this document, the preset position can be defined as the position where the mass block 155 remains stationary when no vibration energy is applied to the battery cell 11. For example, the preset position can refer to the first end, the second end, or the middle of the channel 153. Of course, the preset position can also refer to other positions of the channel 153, and this embodiment does not specifically limit this. When the external environment no longer applies vibration energy to the battery cell 11, the mass block 155 returns to the preset position and remains there under the restoring force of the elastic element.

[0098] Using this technical solution, when the external environment no longer applies vibration energy to the battery cell 11, the mass block 155 can return to the preset position, so that when the next vibration energy is applied to the battery cell 11, it can still move along the channel 153 from the preset position as the starting point. In this way, the natural frequency of the damper is relatively more stable, and the vibration reduction performance is more stable.

[0099] In some embodiments, the center of the mass block 155 may coincide with the center of the channel 153 at a preset position. That is, the preset position refers to the middle of the channel 153. In this embodiment, starting from the preset position, the mass block 155 may move towards a first end or towards a second end. In this way, the direction of movement of the mass block 155 is not restricted when the battery cell 11 begins to vibrate, and the mass block 155 can move to generate an inertial force opposite to the excitation force when the battery cell 11 begins to vibrate, thereby improving the vibration reduction effect.

[0100] According to some embodiments of this application, the damping element 154 may include a damping fluid that fills the channel 153. The damping fluid is a fluid capable of impeding the movement of the mass 155. Exemplarily, the damping fluid may be water, a viscous liquid, ethylene glycol, an electrolyte, or a combination thereof. The viscous liquid may be silicone oil, mineral oil, synthetic oil, glycerol, a polymer solution, or a magnetic fluid, etc. In embodiments where the damping fluid is a viscous liquid, the mass 155 moves in the viscous liquid, and internal friction occurs between the molecules of the viscous liquid, generating resistance. Thus, in addition to impeding the movement of the mass 155 to smooth its motion and broaden the damping frequency of the damper, some vibration energy can be converted into heat through internal friction and dissipated, further reducing the impact of external vibrations on the electrode assembly 120.

[0101] In some embodiments, when the damping element 154 includes both a damping fluid and an elastic element, the material of the elastic element can be a corrosion-resistant material. Thus, the elastic element has corrosion resistance. In this way, when the damping fluid is an electrolyte, the elastic element can still stably exert its damping effect in the electrolyte.

[0102] In some embodiments, the insulating member 150 may have a through hole communicating with the channel 153, and the through hole allows the mass block 155 to pass through. In this way, during assembly, the mass block 155 can be placed into the channel 153 through the through hole.

[0103] As an example, the centerline of the via can be perpendicular to the axis of channel 153, where the axis of channel 153 can be understood as the direction of extension of channel 153. Exemplarily, the via can be provided on the surface of the insulating member 150 opposite to the electrode assembly 120.

[0104] According to some embodiments of this application, the insulating member 150 may be configured to include a main body 151 and a cover 152. The main body 151 is provided with a channel 153, which has a first end and a second end along its own extending direction. At least one of the first end and the second end penetrates the surface of the main body 151 and forms an opening, which is configured to allow a mass block 155 to pass through. The cover 152 is assembled and connected to the main body 151. The number of cover 152 is consistent with the number of openings, with each cover 152 corresponding to one opening. The cover 152 blocks at least a portion of the corresponding opening to restrict the mass block 155 from exiting the channel 153 through the corresponding opening.

[0105] The main body 151 can be cuboid, cylindrical, prismatic, etc. As an example, the channel 153 can be open at one end, with the first end penetrating the surface of the main body 151 to form an opening, and the second end closed. Alternatively, the channel 153 can be open at both ends, with both the first and second ends penetrating the surface of the main body 151 to form openings. In this embodiment, the opening serves as a through hole.

[0106] Taking a channel 153 with one end open as an example, if an elastic element is also provided inside the channel 153, one end of the elastic element is connected to the mass block 155, and the other end can be connected to the cover 152 or the closed end of the channel 153. Taking a channel 153 with both ends open as an example, if an elastic element is also provided inside the channel 153, one end of the elastic element is connected to the mass block 155, and the other end can be connected to the cover 152.

[0107] The cover 152 and the main body 151 are connected by assembly. In some embodiments, the cover 152 and the main body 151 can be fixedly connected. In this example, the main body 151 and the cover 152 are prepared separately, the mass block 155 is placed into the channel 153 through the opening, and then the cover 152 is fixedly connected to the main body 151. For example, the cover 152 is connected to the main body 151 in a detachable manner, for example, by at least one of the following methods: screw connection, snap connection, interference fit, etc. For example, the cover 152 can also be connected to the main body 151 in a non-detachable manner, for example, by adhesive connection, heat fusion connection, welding connection. In this embodiment, the connection between the cover 152 and the main body 151 is more reliable. In this way, when the movement path of the mass block 155 is the entire channel 153, the mass block 155 moves to the first end and collides with the cover 152 or moves to the second end and collides with the cover 152. Since the cover 152 is not detachably connected to the main body 151, the cover 152 can be prevented from separating from the main body 151 under the impact of the mass block 155. This allows the cover 152 to reliably cover the opening, so that the cover 152 can effectively prevent the mass block 155 from leaving the channel 153 throughout the entire life cycle of the battery cell 11.

[0108] In some embodiments, the cover 152 may also be movably connected to the main body 151. Exemplarily, the cover 152 can be opened and closed by rotation or movement. The cover 152 is opened to receive the mass block 155 into the channel 153 through the opening, and then the cover 152 is closed to close the opening.

[0109] The phrase "the cover 152 blocks at least a portion of the corresponding opening" can be interpreted broadly, for example, as the cover 152 blocks the entire opening, or as the cover 152 blocks a portion of the corresponding opening.

[0110] The main body 151 can be manufactured in various ways. In some embodiments, the main body 151 can be a one-piece molded structural component (e.g., injection molding, casting, or extrusion). In this example, the channel 153 is formed by a one-piece molding process. In some embodiments, a one-piece component can be obtained first by a one-piece molding process, and then the channel 153 can be machined on the one-piece component by machining (e.g., drilling, milling, or borer) to obtain the main body 151. In some embodiments, the main body 151 can include a hollow box and a cylindrical body. The surface of the box has mounting holes formed by one-piece molding or machining. The cylindrical body can be inserted into the box through the mounting holes. The cylindrical body can be open at one end or both ends, and the inner surface of the cylindrical body surrounds the channel 153. In this example, the box and the cylindrical body can be prepared separately first, and then assembled and connected to obtain the main body 151.

[0111] In this embodiment, a through hole (i.e., an opening) is formed during the fabrication of the main body 151, eliminating the need for additional through holes and simplifying the fabrication process of the battery cell 11.

[0112] In some embodiments, the cover 152 blocks the corresponding opening portion, and the mass block 155 cannot pass through the unblocked portion of the opening, preventing the mass block 155 from exiting the channel 153 through the opening. For example, when the opening is circular, the cover 152 can be semi-circular, fan-shaped, crescent-shaped, arc-shaped, racetrack-shaped, etc. In this embodiment, the channel 153 is connected to the space inside the housing 110, so that the electrolyte can flow into the channel 153 through the unblocked portion of the opening to act as a damping fluid without the need to inject additional damping fluid into the channel 153.

[0113] According to some embodiments of this application, the cover 152 can be configured to completely block the corresponding opening. That is, the cover 152 blocks the entire opening. In this embodiment, the channel 153 and the space inside the housing 110 are not interconnected. When the channel 153 is filled with a damping fluid, the damping fluid can be the same as the electrolyte, or the damping fluid can be different from the electrolyte.

[0114] In this embodiment, the space inside the channel 153 and the housing 110 is not interconnected. This reduces the impact of electrolyte fluctuations outside the channel 153 on the mass block 155, thus facilitating stable vibration reduction performance of the damper. Furthermore, in an embodiment where the channel 153 is filled with a damping fluid that is different from the electrolyte, the mixing of the damping fluid and the electrolyte outside the channel 153 can be avoided, preventing any negative impact on the performance of the battery cell 11.

[0115] According to some embodiments of this application, the cover 152 and the main body 151 can be sealed together.

[0116] The sealed connection between the cover 152 and the main body 151 means that the cover 152 is connected to the main body 151 and can seal the corresponding opening. In some embodiments, the cover 152 may be interference-fitted with the channel 153. In some embodiments, a sealing element is provided between the cover 152 and the main body 151 to seal the gap between the cover 152 and the main body 151. Exemplarily, the cover 152 may include a connected insertion part and a cover plate, the insertion part being inserted into the channel 153, and the cover plate being located outside the channel 153 and abutting against the surface of the main body 151. The sealing element may be a sealing ring, which is disposed around the outer periphery of the insertion part and is located inside the channel 153 or between the cover plate and the surface of the main body 151. Alternatively, the sealing element may be a sealant used to seal the gap between the cover plate and the main body 151.

[0117] By adopting this technical solution, the sealing performance of the opening can be improved, so as to reliably keep the space inside the channel 153 and the housing 110 from communicating.

[0118] This embodiment does not impose a specific limitation on the number of channels 153. The insulating member 150 may have one channel 153, or the insulating member 150 may have multiple channels 153, such as... Figure 4 The diagram shows 10 channels 153. It is easy to understand that when the insulating element 150 has multiple channels 153, the increased number of channels 153 is beneficial to enhancing the vibration reduction effect.

[0119] In embodiments where the insulating member 150 has multiple channels 153, the extending directions of each channel 153 may be the same or different. As described above, the extending directions of the channels 153 are parallel to the XY plane. In some embodiments, the extending directions of each channel 153 are parallel to each other. For example, ... Figure 5 As shown, the extension direction of each channel 153 is parallel to the X direction. In this example, some vibrations of the battery cell 11 along the X direction can be transferred to the mass block 155 for absorption. As an example, as... Figure 4As shown, the extension direction of each channel 153 is parallel to the Y direction. In this example, the partial vibration of the battery cell 11 along the Y direction can be transferred to the mass block 155 for absorption.

[0120] According to some embodiments of this application, the insulating member 150 is provided with a plurality of channels 153, at least two of which extend in different directions.

[0121] As an example, all channels 153 may extend in different directions; in other words, any two channels 153 may extend in different directions. As an example, the number of channels 153 may be greater than or equal to three, some of which may extend in the same direction while others may extend in different directions.

[0122] For example, the plurality of channels 153 includes a first channel 153 and a second channel 153. The extension direction of the first channel 153 is parallel to a first direction, and the extension direction of the second channel 153 is parallel to a second direction. The first direction and the second direction are perpendicular to the direction of gravity. The first direction can be referred to as the X direction, and the second direction can be referred to as the Y direction. Figure 6 and Figure 7 The diagram shows seven channels 153, including four first channels 153 and three second channels 153. In this embodiment, a mass block 155 within the first channel 153 can move along a first direction to counteract some vibrations in that direction; similarly, a mass block 155 within the second channel 153 can move along a second direction to counteract some vibrations in that direction. Of course, in other embodiments, the extending directions of the first and second channels 153 can also be set at an angle.

[0123] As described above, the electrical devices or energy storage devices composed of the battery cells 11 in this embodiment are subjected to complex vibrations during application or transportation, and these vibrations typically have multiple directions. By employing this technical solution, the extension direction of the channel 153 is not unidirectional, and each mass block 155 can absorb a portion of the vibration energy in the same direction of motion. This benefits the electrode assembly 120 in maintaining stability in complex vibration environments.

[0124] As a feasible embodiment, the insulating member 150 can be disposed between the electrode assembly 120 and the outer peripheral wall of the housing 110. Taking the housing 110 as a cuboid shape as an example, the insulating member 150 can be a plate-like structure, and the thickness direction of the insulating member 150 can be parallel to the length direction or the width direction of the housing 110.

[0125] According to some embodiments of this application, please refer to Figure 3The housing 110 includes an outer peripheral wall and an end wall, with the outer peripheral wall connected to the periphery of the end wall. The battery cell 11 may further include a support member 140 housed within the housing 110, at least a portion of which is located between the electrode assembly 120 and the end wall of the housing 110, and the support member 140 contacts the end face of the electrode assembly 120 facing the end wall. In this embodiment, the support member 140 serves as an insulator 150.

[0126] In this embodiment, the housing 110 may be open at one end, with the end wall facing the opening of the housing 110. When the battery cell 11 is placed in the battery device 100, i.e., along the direction of gravity, the support member 140 may be located below the electrode assembly 120 to support the electrode assembly 120. The support member 140 may also be called a base plate. The support member 140 may have a plate-like structure, and the thickness direction of the support member 140 is parallel to the direction of gravity.

[0127] The end face of the electrode assembly 120 facing the end wall can be planar or nearly planar. In some embodiments, if the end of the diaphragm facing the support member 140 does not extend beyond the positive and negative electrode plates, then the end face of the positive or negative electrode plate facing the end wall of the housing 110 is the end face of the electrode assembly 120 facing the end wall. In some embodiments, if the end of the diaphragm facing the support member 140 extends beyond the positive and negative electrode plates, then the surface formed by bending the diaphragm after it extends between the positive and negative electrode plates is the end face of the electrode assembly 120 facing the end wall.

[0128] The support member 140 is used as an insulating member 150, that is, the support member 140 is provided with a channel 153, and the channel 153 contains a mass block 155.

[0129] In this embodiment, the support member 140 serves as the aforementioned insulating member 150, enabling the support member 140 to serve multiple purposes and eliminating the need for an additional insulating member 150 for vibration reduction. Thus, while utilizing the support member 140 for vibration reduction, the additional insulating member 150 avoids occupying internal space in the housing 110 and sacrificing volumetric energy density; that is, the battery cell 11 still maintains good volumetric energy density. In other words, for the battery cell 11 equipped with the support member 140, the vibration of the electrode assembly 120 can be reduced without decreasing the volumetric energy density.

[0130] Please refer to some embodiments of this application. Figure 3 The battery cell 11 may further include an end cap assembly 130. The electrode assembly 120 is housed within the housing 110. The end cap assembly 130 includes an end cap 131 and a lower plastic component 132. The end cap 131 covers the opening of the housing 110, and the lower plastic component 132 is disposed on the side of the end cap 131 facing the electrode assembly 120 and abuts against the electrode assembly 120. In this embodiment, the lower plastic component 132 serves as an insulating element 150.

[0131] The housing 110 and the end cap assembly 130 can be independent components. The housing 110 has an opening, and the end cap assembly 130 closes the opening to form the internal environment of the battery cell 11. Alternatively, the end cap 131 and the housing 110 can be integrated. Specifically, the end cap 131 and the housing 110 can form a common connection surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 110, the end cap 131 closes the housing 110.

[0132] End cap assembly 130 refers to a component that covers the opening of housing 110 to isolate the internal environment of battery cell 11 from the external environment. Not limited to this, the shape of end cap 131 can be adapted to the shape of housing 110 to fit it. Optionally, end cap 131 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that end cap 131 is not easily deformed under compression and impact, giving battery cell 11 higher structural strength and improved safety performance. Functional components such as electrode terminals can be provided on end cap 131. Electrode terminals can be used for electrical connection with electrode assembly 120 for output or input of electrical energy from battery cell 11.

[0133] The housing 110 may be open at one end or open at both ends. In some examples, the housing 110 may be open at one end, and the housing 110 includes an outer peripheral wall and an end wall. The outer peripheral wall is connected around the end wall, and an end cap assembly 130 is provided and covers the housing 110, with the end cap assembly 130 facing the end wall. In other examples, the housing 110 may also be open at both ends, and two end cap assemblies 130 are provided, each of which covers the two openings of the housing 110. The end cap 131 of each end cap assembly 130 is connected to the outer peripheral wall, and the two end cap assemblies 130 are facing each other. It is understood that in embodiments where the housing 110 is open at one end, when the battery cell 11 is placed upright in the battery device 100, the support member 140 may be located below the electrode assembly 120 along the direction of gravity. When the battery cell 11 is inverted in the battery device 100, the end cap assembly 130 may be located below the electrode assembly 120 along the direction of gravity. Depending on the installation state of the battery cell 11 in the battery device 100, the support member 140 or the end cap assembly 130 may be located below the electrode assembly 120 to support the electrode assembly 120.

[0134] The lower plastic 132 is used as an insulating component 150, which means that the lower plastic 132 is provided with a channel 153, and the channel 153 contains a mass block 155.

[0135] In this embodiment, the lower plastic 132 is used as the aforementioned insulating component 150, enabling the lower plastic 132 to serve multiple purposes, thus eliminating the need for an additional insulating component 150 to achieve vibration reduction. In this way, while utilizing the lower plastic 132 for vibration reduction, the additional insulating component 150 avoids occupying internal space in the housing 110 and sacrificing volumetric energy density; that is, the battery cell 11 still maintains good volumetric energy density. In other words, for the battery cell 11 with the lower plastic 132, the vibration of the electrode assembly 120 can be reduced without decreasing the volumetric energy density.

[0136] According to some embodiments of this application, the lower plastic 132 includes a first part 1321 and a second part 1322 connected together. The dimension of the first part 1321 along the direction of gravity is smaller than the dimension of the second part 1322 along the direction of gravity. The channel 153 is disposed in the second part 1322.

[0137] The lower plastic 132 may have a thickness direction, which can be referenced to the direction of gravity. That is, the thickness of the lower plastic 132 is not uniform throughout. In some embodiments, in... Figure 8 In this configuration, the surface of the second portion 1322 facing the end cap 131 can be coplanar with the surface of the first portion 1321 facing the end cap 131, and the second portion 1322 protrudes from the surface of the first portion 1321 away from the end cap 131 in a direction close to the electrode assembly 120, and the second portion 1322 abuts against the electrode assembly 120. Figure 8 As shown, there may be two second portions 1322, with the two second portions 1322 located on either side of the first portion 1321, and each second portion 1322 having a channel 153. In other embodiments, there may be more second portions 1322, such as three, four, five, six, etc., and multiple second portions 1322 may be arranged sequentially at intervals along a straight line.

[0138] Each second portion 1322 may have one or more channels 153. When multiple channels 153 are provided on a second portion 1322, the extending directions of the multiple channels 153 belonging to the same second portion 1322 may be parallel to each other or may intersect. As an example, the lower plastic 132 has two second portions 1322, and multiple channels 153 are spaced apart along the relative directions of the two second portions 1322. As an example, along the direction of gravity, the second portion 1322 may have multiple channel groups spaced apart, each channel group including at least one channel 153. For example, along the direction of gravity, the second portion 1322 may have two channel groups spaced apart, one channel group closer to the end cap 131 including one channel 153 extending in a second direction, and the other channel group including multiple channels 153 spaced apart along the second direction and extending in a first direction.

[0139] In some embodiments, the lower plastic 132 is provided with a plurality of second portions 1322, each second portion 1322 being provided with a channel 153, and the extension directions of any two channels 153 belonging to different second portions 1322 may be parallel to each other or may intersect.

[0140] As described above, the lower plastic 132 also has the same number of through holes as the channels 153, allowing the mass block 155 to be placed into the channels 153 through the through holes. In some embodiments, the channel 153 has a first end and a second end along its own extending direction, and at least one of the first end and the second end penetrates the surface of the second portion 1322 to form an opening, which serves as a through hole.

[0141] In some embodiments, the second portion 1322 has a first surface and a second surface disposed opposite to each other along the thickness direction, and a side surface connecting the first surface and the second surface, wherein the first surface is closer to the end cap 131 than the second surface. The first surface may be recessed to form a groove, which can serve as a channel 153. Furthermore, an air passage is formed on the lower plastic 132, one end of which penetrates the side surface of the second portion 1322 and forms an air hole, while the other end of the air passage leads to the explosion-proof valve of the battery cell, and the air hole communicates with the groove, as does the air passage. In this embodiment, the opening of the groove facing the end cap 131 can serve as a through hole. Specifically, a mass block is placed into the groove (i.e., channel 153) from the opening of the groove, and then the end cap 131 is fixedly connected to one side of the second portion 1322, covering the opening of the groove, so that the mass block does not detach from the groove (i.e., channel 153).

[0142] During the operation of a single battery cell, high-temperature and high-pressure gas is generated. The gas enters the groove through the vent, then flows along the gas passage to the explosion-proof valve. The high-temperature and high-pressure gas is discharged from the explosion-proof valve, allowing the generated high-temperature and high-pressure gas to flow smoothly to the explosion-proof valve for pressure relief. In this way, the groove connected to the gas passage is used as a channel, and the groove opening is used as a through hole, eliminating the need for additional through holes.

[0143] Compared to the technical solution where the channel 153 is located in the first part 1321, this embodiment opens the channel 153 in the larger dimension along the gravity direction of the first part 1321 and the second part 1322. This is beneficial to give the lower plastic 132 higher structural strength and rigidity, thereby reducing the possibility of deformation of the lower plastic 132 and enabling the mass block 155 inside the lower plastic 132 to stably play a vibration damping role.

[0144] According to some embodiments of this application, the battery cell 11 further includes an electrode assembly 120 housed within the casing 110. The dimension of the insulating member 150 along the gravity direction relative to the dimension of the electrode assembly 120 along the gravity direction can be designed to be 1% to 5%. Wherein, the dimension of the insulating member 150 along the gravity direction is h, and the dimension of the electrode assembly 120 along the gravity direction is H. The proportion of h to H can be 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or any combination thereof.

[0145] By ensuring that the ratio of h to H is not less than 1%, the dimension of the insulating component 150 along the direction of gravity is not too small. This facilitates meeting the manufacturing requirements of the channel 153 (e.g., drilling, milling, or boring) and ensures high processing stability. By ensuring that the ratio of h to H is not greater than 5%, the space occupied by the insulating component 150 in the housing 110 along the direction of gravity is relatively small. This helps to minimize the loss of volumetric energy density caused by the insulating component 150 occupying internal space in the housing 110. Thus, this embodiment allows the insulating component 150 to be easily processed while also ensuring excellent volumetric energy density.

[0146] According to some embodiments of this application, the dimension of channel 153 along the gravity direction accounts for 60% to 90% of the dimension of insulating member 150 along the gravity direction.

[0147] The dimension of channel 153 along the direction of gravity is d1, and the proportion of d1 to h can be 60%, 62.5%, 65%, 67.5%, 70%, 72.5%, 75%, 77.5%, 80%, 82.5%, 85%, 87.5%, 90%, or any combination thereof. When the cross-section of channel 153 perpendicular to its extension direction is circular, the dimension of channel 153 along the direction of gravity can be understood as the diameter of channel 153, and d1 / h can be understood as the ratio of the diameter of channel 153 to the thickness of insulating component 150.

[0148] In some embodiments, the insulating member 150 is a support member 140, and the proportion of d1 to h can be 70% to 90%. In some embodiments, the insulating member 150 is a lower plastic 132, and the proportion of d1 to h can be 60% to 90%. Further, the proportion of d1 to the dimension of the second part 1322 along the direction of gravity is 60% to 90%.

[0149] By ensuring that d1 accounts for no less than 60% of h, the dimension of channel 153 along the direction of gravity is not too small. This avoids the channel 153 becoming too narrow and long due to its small aspect ratio, so as to prevent the mass block 155 from experiencing excessive resistance during its movement within the channel 153. This facilitates smoother movement of the mass block 155 within the channel 153.

[0150] As described above, depending on the installation state of the battery cell 11 in the battery assembly 100, the support member 140 or the end cap assembly 130 may be located below the electrode assembly 120 and subjected to the gravitational pressure of the electrode assembly 120. By ensuring that the proportion of d1 to h is no more than 90%, the insulating member 150 can have good structural strength and rigidity, reducing the possibility of deformation of the insulating member 150 under the pressure of the electrode assembly 120, thus reducing the possibility of collapse of the channel 153, and allowing the mass block 155 inside the insulating member 150 to reciprocate stably within the channel 153 to stably perform the vibration damping function. This better balances the vibration damping effect and the reliability of the vibration damping function.

[0151] According to some embodiments of this application, the maximum dimension of the mass block 155 along the gravity direction accounts for 80% to 95% of the dimension of the channel 153 along the gravity direction.

[0152] The maximum dimension of the mass block 155 along the direction of gravity is d2. The ratio of d2 to d1 can be 80%, 82.5%, 85%, 87.5%, 90%, 92.5%, 95%, or any combination thereof. When the cross-section of the channel 153 perpendicular to its extension direction is circular, and the mass block 155 is spherical, the maximum dimension of the mass block 155 along the direction of gravity can be understood as the diameter of the spherical mass block 155. In this case, d2 / d1 can be understood as the ratio of the diameter of the mass block 155 to the diameter of the channel 153.

[0153] By making the ratio of d2 to d1 within the above range, the mass block 155 and the channel 153 are in clearance fit, so that the mass block 155 can reciprocate within the channel 153 without being completely blocked by the resistance generated by the compression of air or damping fluid within the channel 153.

[0154] It should be noted that d1 cannot exceed h. Therefore, when the value of h is large, d1 can be larger accordingly, so d1 is related to h. Similarly, the maximum dimension of mass block 155 along the direction of gravity is d2. d2 cannot exceed d1. Therefore, when the value of d1 is large, d2 can be larger accordingly, so d2 is related to d1.

[0155] It is understandable that in embodiments where h accounts for 1% to 5% of H, d1 accounts for 60% to 90% of h, and d2 accounts for 80% to 95% of d1, the value range of h is moderate. Therefore, the energy density loss caused by the insulating component 150 occupying the internal space of the housing 110 is relatively small, and the channel 153 is easy to process. Since d1 accounts for 60% to 90% of h, d1 reaches a more suitable range, ensuring that the structural strength and stiffness of the insulating component 150 are not too small, reducing the possibility of deformation of the insulating component 150 under the pressure of the electrode assembly 120, and enabling the mass block 155 inside the insulating component 150 to move stably back and forth within the channel 153. Simultaneously, since d2 accounts for 80% to 95% of d1, the value range of d2 is also more reasonable, which helps to ensure that the mass of the mass block 155 reaches a more suitable range, resulting in better vibration damping effect on the electrode assembly 120.

[0156] According to some embodiments of this application, the coefficient of friction between the mass block 155 and the insulating member 150 can be designed to be less than 0.2. This can be achieved by processing the inner surface of the channel 153 and / or the surface of the mass block 155 using processes such as polishing or applying a lubricating coating. Alternatively, the mass block 155 can be made of materials such as polytetrafluoroethylene (PTFE) to ensure that the coefficient of friction between the mass block 155 and the insulating member 150 is below 0.2. The coefficient of friction between the mass block 155 and the insulating member 150 can be within the range of 0.1, 0.12, 0.15, 0.17, or any combination thereof.

[0157] This technical solution ensures that the mass block 155 moves smoothly and easily within the channel 153, enabling the mass block 155 to effectively perform its vibration reduction function.

[0158] According to some embodiments of this application, the mass of all mass blocks 155 is the first mass, and the mass of the battery cells 11 is the total mass. The proportion of the first mass to the total mass can be designed to be 0.4% to 2%. The proportion of the first mass to the total mass can be 0.4%, 0.6%, 0.8%, 1.0%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, or any combination thereof.

[0159] By ensuring that the proportion of the first mass to the total mass is not less than 0.4%, the mass of the mass block 155 is not too small, thus enabling it to effectively perform its vibration damping function. By ensuring that the proportion of the first mass to the total mass is not greater than 2%, the gravimetric energy density of the battery cell 11 is not excessively lost. This achieves a better balance between vibration damping and gravimetric energy density.

[0160] The structural shape of the mass block 155 and the cross-sectional shape of the channel 153 along its extension direction are not limited. For example, the mass block 155 can be cuboid, and the cross-section of the channel 153 along its extension direction can be rectangular, in which case the mass block 155 slides back and forth along the channel 153. As an alternative embodiment, the mass block 155 can be cylindrical, the cross-section of the channel 153 along its extension direction can be rectangular, and the axial direction of the mass block 155 can be perpendicular to the extension direction of the channel 153, in which case the mass block 155 rolls back and forth along the channel 153. In other embodiments, the mass block 155 can also be ellipsoidal.

[0161] According to some embodiments of this application, the mass block 155 can be a mass sphere with a cross-section perpendicular to the extending direction of the channel 153. The cross-section of the channel 153 is circular, and the channel 153 is adapted to the mass sphere. In this embodiment, the mass block 155 is spherical, and the movement of the mass block 155 along the channel 153 can be rolling or a combination of rolling and sliding.

[0162] Compared to planar sliding, in this embodiment, the mass block 155 moves along the channel 153 in a rolling or combined rolling and sliding manner. The movement of the mass block 155 is smoother and more fluid, allowing it to effectively perform its vibration damping function. Furthermore, because the cross-section of the channel 153 is circular, and the mass block 155 is fitted with the channel 153 with a clearance, the spherical mass block 155 can naturally center itself within the channel 153 and move along the extension direction of the channel 153. This allows the spherical mass block 155 to tolerate certain assembly deviations, thus reducing the requirements for assembly and manufacturing precision.

[0163] According to some embodiments of this application, the insulating element 150 may be configured to be made of a rigid material. Exemplarily, the material of the insulating element 150 may be polyimide (PI), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polypropylene (PP), polycarbonate (PC), or combinations thereof.

[0164] By making the material of the insulating component 150 a rigid material, the structural strength and rigidity of the insulating component 150 are improved, thereby reducing the possibility of deformation of the insulating component 150 under the pressure of the electrode assembly 120. This reduces the possibility of the channel 153 collapsing, and even if the channel 153 can remain stable, the mass block 155 inside the insulating component 150 can reciprocate stably within the channel 153 to stably perform the vibration reduction function.

[0165] An embodiment of the second aspect of this application provides a battery device 100, such as... Figure 2As shown, it includes the battery cell 11 in the above embodiments. It is understood that the battery device 100 provided in this application, by using any of the above-described battery cells 11, has all the beneficial effects of the battery cells 11, which will not be repeated here.

[0166] An embodiment of the third aspect of this application provides an electrical device including the battery device 100 described in the above embodiments, the battery device 100 being used to provide electrical energy. The electrical device includes vehicles (such as vehicles, electric vehicles, ships, spacecraft, etc.), display devices (such as mobile phones, tablets, laptops, etc.), electric toys, power tools, etc. It is understood that the electrical device provided in this application, by utilizing any of the aforementioned battery cells 11, possesses all the beneficial effects of the aforementioned battery cells 11, which will not be elaborated further here.

[0167] An embodiment of the fourth aspect of this application provides an energy storage device, which includes the battery device 100 described in the above embodiments, the battery device 100 being used for energy storage. The energy storage device may include, but is not limited to, centralized energy storage devices (e.g., containerized energy storage devices), distributed energy storage devices, portable energy storage devices, wearable energy storage devices, etc. It is understood that the energy storage device provided in this application, by utilizing any of the aforementioned battery cells 11, possesses all the beneficial effects of the aforementioned battery cells 11, which will not be elaborated further here.

[0168] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0169] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0170] Please see Figures 3 to 8The rectangular battery cell 11 includes a housing 110, an end cap assembly 130, an electrode assembly 120, an electrolyte, and a support 140. The housing 110 is open at one end and includes an outer peripheral wall and an end wall. The outer peripheral wall is connected to the periphery of the end wall. The end cap assembly 130 is provided and covers the housing 110 to form a mounting cavity. The end cap assembly 130 is opposite to the end wall, and the electrode assembly 120 and the electrolyte are housed within the mounting cavity. The end cap assembly 130 includes an end cap 131 and a lower plastic insert 132. The end cap 131 covers the opening of the housing 110, and the lower plastic insert 132 is located on the side of the end cap 131 facing the electrode assembly 120 and abuts against the electrode assembly 120. The lower plastic 132 includes a first part 1321 and two second parts 1322 connected together. The dimension of the first part 1321 along the direction of gravity is smaller than the dimension of the second part 1322 along the direction of gravity. The two second parts 1322 are located on both sides of the first part 1321. The second part 1322 is provided with a channel 153.

[0171] The support member 140 is housed within the housing 110 and is located between the electrode assembly 120 and the end wall of the housing 110. The support member 140 contacts the end face of the electrode assembly 120 facing the end wall. The support member 140 is provided with a plurality of channels 153.

[0172] Each channel 153 has a circular cross-sectional shape along its extending direction, and each channel 153 contains a spherical mass block 155. Each channel 153 has a first end and a second end along its extending direction. The first end penetrates the surface of the support member 140 / lower plastic 132 and forms an opening through which the spherical mass block 155 can pass. The opening is sealed by a cover 152. Each channel 153 contains two springs, both extending along the extending direction of the channel 153 and located on opposite sides of the spherical mass block 155. One end of one spring is connected to the spherical mass block 155, and the other end is connected to the cover 152. One end of the other spring is connected to the spherical mass block 155, and the other end is connected to the second end. Each channel 153 is also filled with a viscous liquid.

[0173] The support member 140 has ten channels 153, and the extension direction of each of the ten channels 153 is parallel to the thickness direction or the length direction of the battery cell 11. Alternatively, the support member 140 has four first channels 153 and three second channels 153, the extension direction of the first channels 153 is parallel to a first direction, the extension direction of the second channels 153 is parallel to a second direction, and the first and second directions are perpendicular to the direction of gravity of the battery cell 11.

[0174] The dimension of the insulating component 150 along the direction of gravity is h, the dimension of the electrode assembly 120 along the direction of gravity is H, the diameter of the channel 153 is d1, and the diameter of the spherical mass block 155 is d2. The proportion of h to H is 1%~5%, and the proportion of d2 to d1 is 80%~95%. For the support component 140, the proportion of d1 to h is 70%~90%. For the lower plastic component 132, the proportion of d1 to h is 60%~90%.

[0175] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: case; An insulating component is housed within the housing. The insulating component has a channel extending perpendicular to the direction of gravity of the housing, and the channel communicates with the space inside the housing. A mass block, housed within the channel, is configured to reciprocate relative to the insulating element along the channel; The channel is provided with a damping element, which is used to provide resistance to the mass block to slow down the movement speed of the mass block along the channel. The damping element includes a damping fluid, which fills the channel. The damping fluid is an electrolyte.

2. The battery cell according to claim 1, characterized in that, The insulating element is configured to include: The main body is provided with the channel, which has a first end and a second end along its own extending direction. At least one of the first end and the second end penetrates the surface of the main body and forms an opening, which is configured to allow the mass block to pass through. A cover is assembled and connected to the main body. The number of covers is the same as the number of openings. Each cover corresponds to one opening. The cover blocks at least a portion of the corresponding opening to restrict the mass block from leaving the channel through the corresponding opening.

3. The battery cell according to claim 2, characterized in that, The cover completely seals off the corresponding opening.

4. The battery cell according to claim 3, characterized in that, The cover is sealed to the main body.

5. The battery cell according to claim 2, characterized in that, The cover is non-detachably connected to the main body.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The insulating element has multiple channels, and at least two of the channels extend in different directions.

7. The battery cell according to any one of claims 1 to 5, characterized in that, The housing includes an outer peripheral wall and an end wall, the outer peripheral wall being connected around the end wall; the battery cell further includes an electrode assembly and a support member housed within the housing, at least a portion of the support member being located between the electrode assembly and the end wall of the housing, the support member contacting the end face of the electrode assembly facing the end wall; the support member serves as the insulating member.

8. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell also includes an electrode assembly and an end cap assembly. The electrode assembly is housed within the housing. The end cap assembly includes an end cap and a lower plastic component. The end cap covers the opening of the housing. The lower plastic component is disposed on the side of the end cap facing the electrode assembly and abuts against the electrode assembly. The lower plastic component serves as the insulating element.

9. The battery cell according to claim 8, characterized in that, The lower plastic includes a first part and a second part connected together, wherein the dimension of the first part along the direction of gravity is smaller than the dimension of the second part along the direction of gravity, and the channel is disposed in the second part.

10. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell also includes an electrode assembly housed within the casing, wherein the dimension of the insulating member along the direction of gravity accounts for 1% to 5% of the dimension of the electrode assembly along the direction of gravity; And / or, the dimension of the channel along the direction of gravity accounts for 60% to 90% of the dimension of the insulating element along the direction of gravity; And / or, the maximum dimension of the mass block along the direction of gravity accounts for 80% to 95% of the dimension of the channel along the direction of gravity.

11. The battery cell according to any one of claims 1 to 5, characterized in that, The coefficient of friction between the mass block and the insulating component is less than 0.2; And / or, the mass of all the mass blocks is the first mass, the mass of the battery cell is the total mass, and the first mass accounts for 0.4% to 2% of the total mass.

12. The battery cell according to any one of claims 1 to 5, characterized in that, The mass block is a mass sphere with a cross-section perpendicular to the extension direction of the channel. The cross-section of the channel is circular, and the channel is adapted to the mass sphere.

13. The battery cell according to any one of claims 1 to 5, characterized in that, The insulating element is made of a rigid material.

14. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 13.

15. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

16. An energy storage device, characterized in that, The energy storage device includes the battery device as described in claim 14, the battery device being used to store electrical energy.

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