Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises a supporting piece, an electrode assembly and a shell, the supporting piece and the electrode assembly are arranged in the shell, the supporting piece comprises a core rod part and a plurality of elastic supporting parts, and the core rod part is arranged in the shell. The multiple elastic supporting parts are connected to the peripheral face of the core rod part and distributed at intervals, a buffer space is formed between every two adjacent elastic supporting parts, and the electrode assembly is wound around the peripheral side of the supporting piece and abuts against the multiple elastic supporting parts. The plurality of elastic supporting parts of the supporting piece are arranged at intervals and can adapt to the volume change of the electrode assembly by virtue of the elastic deformation of the elastic supporting parts and the volume change of the buffer space, so that the supporting force can be changed while supporting is provided for the electrode assembly, and the supporting force of the supporting piece on the electrode assembly is optimized; and the risk that the electrode assembly is damaged due to overlarge supporting force is reduced, so that the reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] There are many types of batteries, with cylindrical batteries being one of the more common ones. Cylindrical batteries pose a safety hazard of collapsing during repeated charging and discharging. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, wherein the battery cell is beneficial to improving reliability.

[0005] In a first aspect, this application provides a battery cell, the battery cell including a support member, an electrode assembly and a housing, the support member and the electrode assembly being disposed within the housing, the support member including a core rod portion and a plurality of elastic support portions, the plurality of elastic support portions being connected to the outer peripheral surface of the core rod portion and distributed at intervals between each other, a buffer space being formed between adjacent elastic support portions, the electrode assembly being wound around the outer peripheral side of the support member and abutting against the plurality of elastic support portions.

[0006] In the technical solution of this application embodiment, the core rod portion can provide support for the elastic support portion and facilitate the insertion of the support member into the electrode assembly. Multiple elastic support portions are spaced apart, allowing them to adapt to changes in the volume of the electrode assembly through their own elastic deformation and the volume change of the buffer space. This provides support to the electrode assembly while simultaneously changing the magnitude of the support force, optimizing the support force on the electrode assembly, reducing the risk of damage to the electrode assembly due to excessive support force, and thereby improving the reliability of the battery cell.

[0007] In some embodiments, the thickness of the elastic support gradually decreases from the core rod portion to the electrode assembly. This not only facilitates deformation of the elastic support and guides its deformation, but also reduces the overall stiffness of the elastic support, making it easier to adjust the support force.

[0008] In some embodiments, at least one of the two sides of the elastic support portion in the thickness direction is tangentially disposed to the outer peripheral surface of the core rod portion. This reduces stress concentration at the junction of the elastic support portion and the core rod portion when the elastic support portion undergoes elastic deformation, thereby optimizing the stress distribution on the support member.

[0009] In some embodiments, at least one of the two sides of the elastic support portion in the thickness direction has a length from the core rod portion to the electrode assembly that is not greater than two-thirds of the circumference of the outer peripheral surface of the core rod portion. This prevents adjacent elastic support portions from entangled when deformed, facilitating changes in the support force of the support member.

[0010] In some embodiments, the elastic support portion includes a first surface and a second surface on both sides in the thickness direction, wherein the first surface is a smooth convex surface and the second surface is a smooth concave surface. Thus, the elastic support portion provides support force through bending deformation, thereby increasing the range of variation of the support force and reducing the localized stress on the electrode assembly.

[0011] In some embodiments, the perpendicular line at the junction of the first surface and the core rod is called the first perpendicular line, and the perpendicular line at the junction of the second surface and the core rod is called the second perpendicular line. The distance between the first perpendicular line and the second perpendicular line gradually decreases along the direction away from the elastic support. This reduces the stiffness of the portion of the second surface adjacent to the core rod, optimizes the stress on the second surface during deformation, and facilitates deformation of the elastic support.

[0012] In some embodiments, the elastic support portion and the core rod portion are integrally formed, and the contact area between the first surface and the electrode assembly fluctuates within a range less than half the area of ​​the first surface. This allows control not only of the upper limit of the support force but also of the deformation of the elastic support portion, reducing the risk of damage to the elastic support portion.

[0013] In some embodiments, the elastic support portion has a third surface that fits against the core rod portion. The third surface is an arc-shaped surface, and the arc length is no greater than one-third of the circumference of the outer perimeter of the core rod portion. This reduces the contact area between the elastic support portion and the core rod portion, facilitates deformation at the end of the elastic support portion connected to the core rod portion, and lowers the upper limit of the support force, thereby reducing the local stress generated by the support member on the electrode assembly.

[0014] In some embodiments, the support further includes an elastic sleeve located between the elastic support portion and the electrode assembly, and respectively fitting against the elastic support portion and the electrode assembly. The elastic sleeve has a plurality of exchange holes in the radial direction, and the exchange holes penetrate the elastic sleeve. Thus, the elastic sleeve not only increases the contact area between the support and the electrode assembly, reducing local stress on the electrode assembly and making the force on the electrode assembly more balanced, but also allows electrolyte to enter or flow out of the buffer space through the exchange holes, facilitating electrolyte flow.

[0015] In some embodiments, the ratio between the inner diameter of the elastic sleeve and the outer diameter of the core portion fluctuates between 1.2 and 3. Thus, the maximum compression of the support volume during electrode assembly expansion can be 75% of its initial state.

[0016] In some embodiments, the end of the elastic support portion opposite to the core rod portion is provided with a bonding piece. The bonding piece is arc-shaped and spaced apart from adjacent elastic support portions. In this way, the bonding piece can not only bond with the electrode assembly between adjacent elastic support portions, making the supporting force on the electrode assembly more balanced, but also leave space for the deformation of the support member.

[0017] In some embodiments, the number of elastic supports along the circumference of the core rod is not less than three, and the included angles between adjacent elastic supports are equal. This balances the force on the electrode assembly in the circumferential direction, reducing the difference in deformation of the electrode assembly in the circumferential direction.

[0018] In some embodiments, the elastic support portion is arranged parallel to the core rod portion along the axial direction of the core rod portion, or the elastic support portion is spirally arranged around the core rod portion. Thus, when the elastic support portion is arranged parallel to the core rod portion, circumferential movement of the support member within the electrode assembly can be reduced; when the elastic support portion is spirally arranged around the core rod portion, it facilitates insertion of the support member into the electrode assembly.

[0019] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0020] Thirdly, 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.

[0021] 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

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0023] Figure 1 This is a simplified schematic diagram of a vehicle according to some embodiments of this application;

[0024] Figure 2 This is a split schematic diagram of a battery device according to some embodiments of this application;

[0025] Figure 3 This is a schematic diagram showing the disassembled battery cell of some embodiments of this application;

[0026] Figure 4 This is a schematic diagram of the support structure from one perspective for some embodiments of this application;

[0027] Figure 5 This is a structural schematic diagram of the support member of some embodiments of this application from another perspective;

[0028] Figure 6 For this application Figure 5 A schematic diagram of the support component in the contracted state;

[0029] Figure 7 This is a schematic diagram of the structure of the support member in some other embodiments of this application;

[0030] Figure 8 This is a schematic diagram of the structure of the support member according to some embodiments of this application;

[0031] Figure 9 This is a schematic diagram of the structure in some embodiments of this application, showing that the elastic support portion and the core rod portion are parallel to each other.

[0032] Figure 10 This is a schematic diagram of the structure of the elastic support portion spiraling around the axis of the core rod in some embodiments of this application.

[0033] The reference numerals in the detailed embodiments are as follows:

[0034] 1000 - Vehicle; 100 - Battery unit; 200 - Controller; 300 - Motor;

[0035] 10 - Battery module; 11 - Housing; 111 - First housing; 112 - Second housing;

[0036] 1-Battery cell; 2-Support component; 21-Core rod; 211-Weight reduction hole; 22-Elastic support; 221-First surface; 222-Second surface; 223-Third surface; 23-Elastic sleeve; 24-Buffer space; 25-Adhesive piece; L1-First vertical line; L2-Second vertical line; 3-Electrode assembly; 4-Outer shell. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0042] 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).

[0043] 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.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0046] There are many types of batteries, with cylindrical batteries being one of the most common. The electrode assembly of a cylindrical battery is typically wound. During winding, the positive electrode, separator, and negative electrode are stacked and wound onto a winding needle. After winding, the needle retracts, leaving holes inside the electrode assembly. Due to these holes, the electrode assembly may loosen, leading to increased interlayer spacing. This increased spacing reduces the kinetic characteristics of the cylindrical battery and increases the risk of lithium plating. During charging and discharging, the electrodes (positive and negative) undergo repeated volume expansion, with different expansion rates between the positive and negative electrodes. Stress differences exist between the electrode layers. As the number of charge-discharge cycles increases, the electrode volume expands, and the continuous compression between the electrodes causes the electrode assembly to expand further. If there are no supporting structures within the holes, repeated volume changes can cause deformation or even collapse of the wound structure, leading to electrode bending, increased interlayer spacing, and film shedding, ultimately resulting in performance degradation or even failure, thus posing a safety hazard.

[0047] In related technologies, a center pin is typically inserted into the cavity. During the use of cylindrical batteries, due to repeated lithium-ion insertion and extraction reactions, the electrode material may age and change in volume, leading to deformation of the electrode assembly. The center pin can provide support within the cavity, reinforcing the cavity and preventing the electrode assembly from collapsing inward, thereby reducing deformation and improving structural stability. However, the center pins in these technologies are usually rigid or liquid-absorbing expansion center pins. Rigid center pins have an unchangeable and unadjustable volume. While they provide some support, they cannot adapt to changes in the state of charge and aging life of the electrode assembly with increasing charge-discharge cycles, nor can they alleviate the stress changes caused by expansion. Liquid-absorbing expansion center pins, after electrolyte injection, have an increased volume of liquid-absorbing expansion material, which can increase the support for the electrode assembly. However, this material consumes some electrolyte and carries the risk of electrochemical decomposition producing undesirable byproducts. Therefore, the center pins in these technologies fail to effectively solve the problem of electrode assembly collapse.

[0048] To address the issue of electrode assembly structural collapse caused by electrode expansion stress in cylindrical batteries, the center pin can be structurally designed as an elastic component capable of compression and expansion. The center pin provides support within the holes of the electrode assembly. Simultaneously, when the electrode assembly expands, causing the radial dimension of the holes to decrease, the center pin can compress to accommodate the reduced radial dimension. Conversely, when the radial dimension of the electrode assembly's holes increases, the center pin can expand to accommodate the increased radial dimension.

[0049] Based on the above considerations, this application designs a battery cell, which includes a support member, an electrode assembly, and a housing. The support member and the electrode assembly are both installed inside the housing. The support member includes a core rod and multiple elastic support parts. The multiple elastic support parts are all connected to the outer peripheral surface of the core rod and are distributed at intervals. A buffer space is formed between adjacent elastic support parts. The electrode assembly has a wound structure and is wound around the outer peripheral side of the multiple elastic support parts.

[0050] In this type of battery cell, the support component is located within the electrode assembly, providing support force inside the electrode assembly and preventing inward collapse. The core rod provides support for the elastic support component and facilitates the assembly of the support component with the electrode assembly. The elastic support component can elastically deform according to the volume change of the electrode assembly, changing the volume of the buffer space. This allows the support component to adjust its own structure and volume, thereby adapting to the volume change of the electrode assembly and adjusting the support force accordingly, thus improving the reliability of the battery cell.

[0051] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application, which helps to improve reliability.

[0052] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0053] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0054] Please refer to Figure 1 , Figure 1 This is a simplified schematic diagram of a vehicle according to some embodiments of this application.

[0055] 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 installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0056] 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.

[0057] Please refer to Figure 2 , Figure 2 This is a split schematic diagram of a battery device according to some embodiments of this application.

[0058] The battery device 100 includes a housing 11 and a battery cell 1, with the battery cell 1 housed within the housing 11. The housing 11 provides a space for the battery cell 1 and can have various structures. In some embodiments, the housing 11 may include a first housing 111 and a second housing 112, which overlap each other, collectively defining a space for accommodating the battery cell 1. The second housing 112 may be a hollow structure with one open end, while the first housing 111 may be a plate-like structure, covering the open side of the second housing 112 so that the first housing 111 and the second housing 112 together define the space. Alternatively, both the first housing 111 and the second housing 112 may be hollow structures with one open end, with the open side of the first housing 111 covering the open side of the second housing 112. Of course, the box 11 formed by the first box 111 and the second box 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0059] In the battery device 100, there can be multiple battery cells 1, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 1 are connected in both series and parallel configurations. Multiple battery cells 1 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 1 is housed within the housing 11. Alternatively, the battery device 100 can also consist of multiple battery cells 1 first connected in series, parallel, or in a mixed manner to form a battery module 10, and then multiple battery modules 10 connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 100 may also include other structures; for example, the battery device 100 may also include a busbar component for realizing electrical connections between multiple battery cells 1.

[0060] Each battery cell 1 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0061] Please refer to Figure 3 , Figure 3 This is a schematic diagram showing the disassembled battery cell of some embodiments of this application.

[0062] A battery cell 1 refers to the smallest unit that makes up the battery device 100. A battery cell 1 includes a housing 4 (the housing 4 includes a shell and a cover plate, on which electrode terminals can be installed), an electrode assembly 3, and other functional components.

[0063] A cover plate is a component that closes onto the opening of the casing to isolate the internal environment of the battery cell 1 from the external environment. Optionally, the cover plate can be made of a material with a certain degree of hardness and strength (such as aluminum alloy), so that the cover plate is not easily deformed when subjected to compression or impact, giving the battery cell 1 higher structural strength and improving safety performance. Electrode terminals are mounted on the cover plate and can be used for electrical connection with the electrode assembly 3 to output or input electrical energy to the battery cell 1.

[0064] The casing is a component used to cooperate with the cover plate to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 3, the electrolyte, and other components. The casing can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of this application do not impose any special limitations on this.

[0065] Electrode assembly 3 is the component in the battery cell 1 where the electrochemical reaction occurs. Electrode assembly 3 is mainly formed by winding positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body of electrode assembly 3, while the portions of the positive and negative electrode sheets without active material constitute the positive and negative electrode tabs, respectively. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the positive and negative electrode tabs connect to the electrode terminals to form a current loop.

[0066] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the support structure from one perspective for some embodiments of this application.

[0067] According to some embodiments of this application, this application provides a battery cell 1, which includes a support member 2, an electrode assembly 3, and a housing 4. The support member 2 and the electrode assembly 3 are disposed inside the housing 4. The support member 2 includes a core rod portion 21 and a plurality of elastic support portions 22. The plurality of elastic support portions 22 are all connected to the outer peripheral surface of the core rod portion 21 and are distributed at intervals between each other. A buffer space 24 is formed between adjacent elastic support portions 22. The electrode assembly 3 is wound around the outer peripheral side of the support member 2 and abuts against the plurality of elastic support portions 22.

[0068] Both the outer casing 4 and the electrode assembly 3 are cylindrical. The outer casing 4 seals both the electrode assembly 3 and the support member 2 within its own cavity. The electrode assembly 3 has a wound structure. During the forming of the electrode assembly 3, the winding needle winds the electrode assembly 3 into shape, and then the winding needle is removed, forming a central hole on the electrode assembly 3. After the support member 2 is inserted into the central hole, one or more elastic support parts 22 are in a state of compressive deformation and have a tendency to rebound, thus providing support for the electrode assembly 3. When the radial dimension of the central hole changes, the deformation of the elastic support part 22 and the volume of the buffer space 24 between adjacent elastic support parts 22 both change. At the same time, as the number of charge and discharge cycles of the battery cell 1 increases, the radial dimension of the central hole gradually decreases, the deformation of the elastic support part 22 gradually increases, and the volume of the buffer space 24 gradually decreases.

[0069] The core rod portion 21 is the rigid part of the support member 2, providing rigid support for the support portion. The core rod portion 21 can be a round rod, and its axis is arranged parallel to the axis of the electrode assembly 3. Optionally, the core rod portion 21 can be provided with a weight-reducing hole 211 along its own axial direction to reduce the weight of the support member 2 and increase the energy density of the battery cell 1. The weight-reducing hole 211 can penetrate through the core rod portion 21, or it can extend to a certain depth only at one or both ends of the core rod portion 21 along its own axial direction.

[0070] The elastic support portion 22 is the part of the support member 2 that can undergo elastic deformation. Along the length of the elastic support portion 22, its thickness can be gradually varied (for example, the thickness of the elastic support portion 22 gradually decreases as it moves further away from the core rod portion 21, and the elastic support portion 22 is conical); the elastic support portion 22 can also be of uniform thickness and be sheet-like. The elastic support portion 22 is made of a material with low density, high toughness, high mechanical strength, and resistance to electrochemical corrosion. Optionally, the elastic support portion 22 can be made of any one of carbon fiber, glass fiber, or boron fiber, or different elastic support portions 22 can use different types of the aforementioned materials.

[0071] The elastic support portion 22 is disposed on the outer peripheral surface of the core rod portion 21. The elastic support portion 22 can be integrally formed with the core rod portion 21, or it can be installed on the core rod portion 21 after it has been formed. There are various structural forms when the elastic support portion 22 is disposed on the outer peripheral surface of the core rod portion 21.

[0072] For example, the core rod 21 is a round rod, and a plurality of elastic support parts 22 are connected to the circumferential surface of the core rod 21. These support parts are all inclined clockwise or counterclockwise in the circumferential direction of the core rod 21 and abut against the electrode assembly 3. When the radial dimension of the central hole of the electrode assembly 3 changes, the elastic support parts 22 bend and deform along the inclined direction, adapting to the change in the radial dimension of the central hole by their own deformation and the volume change of the buffer space 24.

[0073] For example, the core rod 21 is a round rod, and a plurality of elastic support parts 22 are connected to the circumferential surface of the core rod 21. Each elastic support part 22 extends radially along the core rod 21 to abut against the electrode assembly 3 and is supported within the central hole. When the radial dimension of the central hole of the electrode assembly 3 changes, the elastic support parts 22 deform radially in the central hole. This deformation can be a change in the length of the elastic support part 22 or a bending of the elastic support part 22.

[0074] In the technical solution of this application embodiment, the battery cell 1 includes a support member 2, an electrode assembly 3, and a housing 4. The support member 2 includes a core rod portion 21 and multiple elastic support portions 22 connected to the outer peripheral surface of the core rod portion 21. The elastic support portions 22 abut against the electrode assembly 3, and a buffer space 24 is formed between adjacent elastic support portions 22. The core rod portion 21 can provide support for the elastic support portions 22, thereby improving the uniformity of force distribution among the multiple support members 2; it can also facilitate the assembly of the support members 2 and the electrode assembly 3, making it easy to insert the support members 2 into the electrode assembly 3. The multiple elastic support portions 22 are spaced apart, and can adapt to the volume changes of the electrode assembly 3 by their own elastic deformation and the volume changes of the buffer space 24. While providing support for the electrode assembly 3, they can also change the support force, optimize the stress of the support member 2 on the electrode assembly 3, reduce the risk of the electrode assembly 3 being damaged due to excessive support force, and thus improve the reliability of the battery cell 1. Furthermore, the support member 2 relies on the deformation of the elastic support portion 22 and the volume change of the buffer space 24 to change the supporting force. The support member 2 itself does not consume electrolyte or undergo electrochemical reactions. As the battery cell 1 expands slowly with the increase of charge and discharge cycles, the supporting force provided by the support member 2 increases slowly, but the supporting force is significantly reduced compared to the rigid center pin. This helps to maintain the structural stability of the electrode assembly 3 and extend the service life of the battery cell 1.

[0075] Please refer to Figure 5 and Figure 6 , Figure 5 This is a structural schematic diagram of the support member of some embodiments of this application from another perspective; Figure 6 For this application Figure 5 A schematic diagram of the support component in the contracted state.

[0076] According to some embodiments of this application, optionally, the thickness of the elastic support portion 22 gradually decreases from the core rod portion 21 to the electrode assembly 3.

[0077] The elastic support portion 22 has a gradually varying wall thickness along its length. The thickness of the elastic support portion 22 gradually decreases from one end of the connecting core rod portion 21 towards the end of the connecting electrode assembly 3. When the thickness of the elastic support portion 22 changes, the thickness can change linearly or non-linearly. When the thickness of the elastic support portion 22 changes non-linearly, the magnitude of the thickness change from one end of the connecting core rod portion 21 towards the end of the connecting electrode assembly 3 can gradually increase or gradually level off.

[0078] In the technical solution of this application embodiment, the thickness of the elastic support 22 is gradually reduced, and the thickness gradually decreases from the core rod 21 to the electrode assembly 3. This not only facilitates the deformation of the elastic support 22 and guides the deformation of the elastic support 22, but also reduces the overall stiffness of the elastic support 22, making it easier to adjust the support force.

[0079] like Figure 5 As shown, according to some embodiments of this application, optionally, at least one side of the elastic support portion 22 in the thickness direction is tangent to the outer peripheral surface of the core rod portion 21.

[0080] Along the axial direction of the core rod 21, the elastic support 22 extends in the width direction. The width of the elastic support 22 may be equal to or unequal to the length of the core rod 21. In a plane perpendicular to the axis of the core rod 21, the elastic support 22 extends in the length direction, and in this plane, perpendicular to the length direction, is the thickness direction of the elastic support 22.

[0081] The two surfaces of the elastic support 22 perpendicular to its own thickness direction are the two sides of the elastic support 22 in the thickness direction. One of these two sides may be tangent to the outer peripheral surface of the core rod 21, or both sides may be tangent to the outer peripheral surface of the core rod 21.

[0082] In the technical solution of this application embodiment, at least one of the two sides of the elastic support 22 in the thickness direction is tangential to the outer peripheral surface of the core rod 21. When the elastic support 22 undergoes elastic deformation, it can reduce the stress concentration at the joint between the side and the core rod 21, thereby optimizing the force on the support member 2, facilitating the deformation of the support member 2, and also improving the connection strength between the elastic support 22 and the core rod 21.

[0083] like Figure 5 As shown, according to some embodiments of this application, optionally, the length of the elastic support portion 22 from the core rod portion 21 to the electrode assembly 3 on both sides in the thickness direction is not greater than two-thirds of the circumference of the outer peripheral surface of the core rod portion 21.

[0084] Along the core rod portion 21 toward the electrode assembly 3, the lengths of the two sides can be the same or different. Of the two lengths, the larger length is no more than two-thirds of the circumference of the outer perimeter of the core rod portion 21. For example, it can be one-sixth, one-third, one-half, two-thirds, etc.

[0085] In the technical solution of this application embodiment, the length of both sides of the elastic support portion 22 in the thickness direction is not greater than two-thirds of the circumference of the outer perimeter of the core rod portion 21, and there is a buffer space 24 between adjacent elastic support portions 22. When the elastic support portion 22 deforms, the adjacent elastic support portions 22 will not entangle with each other, which makes it easy for the support member 2 to change the support force.

[0086] like Figure 5 and Figure 6 As shown, according to some embodiments of this application, optionally, the elastic support portion 22 includes a first surface 221 and a second surface 222 on both sides in the thickness direction, the first surface 221 being a smooth convex surface and the second surface 222 being a smooth concave surface.

[0087] Both the first surface 221 and the second surface 222 are smooth curved surfaces with gradual transitions, lacking any concave points, convex points, or edges. The first surface 221 is a convex surface, meaning that the line segment connecting the two endpoints of the first surface 221 along its length is located within the elastic support portion 22 or intersects with the second surface 222. The second surface 222 is a concave surface, meaning that the line segment connecting the two endpoints of the second surface 222 along its length is located outside the elastic support portion 22. The first surface 221 is a smooth convex surface, and the second surface 222 is a smooth concave surface, thus the core rod portion 21 gradually bends towards the electrode assembly 3, and the elastic support portion 22 gradually bends towards the second surface 222.

[0088] In the technical solution of this application embodiment, the first surface 221 is a smooth convex surface, the second surface 222 is a smooth concave surface, and the elastic support part 22 provides support force by bending deformation, thereby increasing the range of variation of support force and reducing the local stress on the electrode assembly 3.

[0089] Please refer to Figure 7 , Figure 7 This is a schematic diagram of the structure of the support member in some other embodiments of this application.

[0090] According to some embodiments of this application, optionally, the perpendicular line at the junction of the first surface 221 and the core rod portion 21 is the first perpendicular line L1, and the perpendicular line at the junction of the second surface 222 and the core rod portion 21 is the second perpendicular line L2. The distance between the first perpendicular line L1 and the second perpendicular line L2 gradually decreases along the direction away from the elastic support portion 22.

[0091] The first perpendicular line L1 refers to the ray on the normal line of the first surface 221 at the junction of the first surface 221 and the core rod 21, with the junction point as the endpoint; the second perpendicular line L2 refers to the ray on the normal line of the second surface 222 at the junction of the second surface 222 and the core rod 21, with the junction point as the endpoint.

[0092] For example, when the first surface 221 is tangential to the outer peripheral surface of the core rod portion 21, the first vertical line L1 is radially along the core rod portion 21 and intersects the axis of the core rod portion 21.

[0093] In the technical solution of this application embodiment, the distance between the first vertical line L1 and the second vertical line L2 gradually decreases along the direction away from the elastic support portion 22, which can reduce the stiffness of the portion of the second surface 222 adjacent to the core rod portion 21, thereby optimizing the stress of the second surface 222 during deformation and facilitating the deformation of the elastic support portion 22.

[0094] like Figure 7 As shown, according to some embodiments of this application, optionally, the elastic support portion 22 and the core rod portion 21 are integrally formed, and the contact area between the first surface 221 and the electrode assembly 3 fluctuates within a range less than half the area of ​​the first surface 221.

[0095] The core rod 21 is made of a rigid material and cannot be deformed; the elastic support 22 is made of a tough material and can undergo elastic deformation. When the elastic support 22 and the core rod 21 are formed as one piece, they can be formed as one piece, or they can be formed separately and then connected as a whole.

[0096] For example, when the elastic support portion 22 and the core rod portion 21 are integrally formed, a semi-finished core rod can be prepared first (which becomes the core rod portion 21 after the support 2 is formed). The semi-finished core rod is connected to the elastic support portion 22 as a whole during the forming process of the elastic support portion 22. When the elastic support portion and the core rod portion 21 are connected as a whole after they are each formed, the connection can be achieved by welding, bonding, snap-fitting, etc.

[0097] When supporting the electrode assembly 3, the elastic support 2 is in contact with the electrode assembly 3 through its first surface 221. When the dimensions of the electrode assembly 3 change during use, the contact area between the first surface 221 and the electrode assembly 3 changes.

[0098] For example, the electrode assembly 3 gradually expands as the number of charge and discharge cycles increases, and the area of ​​the first surface 221 that is in contact with the electrode assembly 3 gradually increases. Furthermore, as the area gradually increases, the upper limit does not exceed one-half of the area of ​​the first surface 221.

[0099] In the technical solution of this application embodiment, the contact area between the first surface 221 and the electrode assembly 3 fluctuates within a range less than half the area of ​​the first surface 221. This not only controls the upper limit of the supporting force but also controls the deformation of the elastic support portion 22, reducing the risk of damage to the elastic support portion 22. The elastic support portion 22 and the core rod portion 21 are integrally formed, and the support member 2 is a single component. This not only improves the structural strength of the support member 2 but also reduces the number of parts in the battery cell 1, lowering the assembly difficulty.

[0100] like Figure 7 As shown, according to some embodiments of this application, optionally, the elastic support portion 22 is provided with a third surface 223 that fits against the core rod portion 21. The third surface 223 is an arc-shaped surface, and the arc length is not greater than one-third of the circumference of the outer perimeter of the core rod portion 21.

[0101] The outer peripheral surface of the core rod portion 21 is connected to a plurality of elastic support portions 22. At the end connected to the core rod portion 21, the plurality of elastic support portions 22 can be spaced apart or connected together, but not intersecting. The upper limit of the arc length of the third surface 223 is one-third of the circumference of the outer peripheral surface of the core rod portion 21. The arc length value of the third surface 223 can be within a range not exceeding one-third of the circumference of the outer peripheral surface of the core rod portion 21. For example, the arc length of the third surface 223 can be one-third, one-quarter, one-fifth, one-sixth, etc. of the circumference of the outer peripheral surface of the core rod portion 21.

[0102] In the technical solution of this application embodiment, the arc length of the third surface 223 is not greater than one-third of the circumference of the outer peripheral surface of the core rod portion 21, which can reduce the bonding area between the elastic support portion 22 and the core rod portion 21, facilitate the deformation of the end of the elastic support portion 22 connected to the core rod portion 21, and reduce the upper limit of the support force, thereby reducing the local stress generated on the electrode assembly 3.

[0103] like Figure 7 As shown, according to some embodiments of this application, optionally, the support member 2 further includes an elastic sleeve 23, which is located between the elastic support portion 22 and the electrode assembly 3, and is respectively attached to the elastic support portion 22 and the electrode assembly 3. The elastic sleeve 23 is provided with a plurality of exchange holes (not shown) in the radial direction, and the exchange holes pass through the elastic sleeve 23.

[0104] The wall thickness of the elastic sleeve 23 ranges from 0.1 mm to 3 mm, and the aperture of the exchange holes ranges from 1 μm to 100 μm. The total area of ​​all exchange holes accounts for 5% to 70% of the outer peripheral surface area of ​​the elastic sleeve 23. The parameters of the elastic sleeve 23 can vary accordingly with the specifications of the battery cell 1. In smaller battery cells 1, the wall thickness of the elastic sleeve 23 is small and the aperture of the exchange holes is small; in larger battery cells 1, the wall thickness of the elastic sleeve 23 is large and the aperture of the exchange holes is large.

[0105] The elastic sleeve 23 is elastic and can contract and expand radially. The elastic sleeve 23 can be made of a membrane material, such as polytetrafluoroethylene (PTFE), polyimide, polypropylene, or polyethylene. Exchange holes can be evenly distributed or randomly distributed on the elastic sleeve 23. The hole diameters of the multiple exchange holes can be the same or different. The elastic sleeve 23 and the elastic support 22 can be an integral or separate design.

[0106] In the technical solution of this application embodiment, the elastic sleeve 23 is located between the elastic support 22 and the electrode assembly 3, and is respectively attached to the electrode assembly 3. This can increase the contact area between the support 2 and the electrode assembly 3, reduce the local stress of the electrode assembly 3, and make the force on the electrode assembly 3 more balanced. The elastic sleeve 23 is provided with multiple exchange holes in the radial direction, and the electrolyte can enter the buffer space 24 through the exchange holes or flow out of the buffer space 24, which facilitates the flow of electrolyte.

[0107] like Figure 5 and Figure 6 As shown, according to some embodiments of this application, optionally, the ratio between the inner diameter of the elastic sleeve 23 and the outer diameter of the core rod portion 21 may fluctuate within a range of 1.2 to 3.

[0108] The elastic sleeve 23 is elastic and can fit the electrode assembly 3, contracting or expanding as the volume of the electrode assembly 3 changes. The elastic support portion 22 fits against the elastic sleeve 23, providing support for the elastic sleeve 23, and thus providing support for the electrode assembly 3. When the electrode assembly 3 is first put into use, the ratio of the inner diameter of the elastic sleeve 23 to the outer diameter of the core rod portion 21 can be 3. As the number of charge and discharge cycles of the battery cell 1 increases, the electrode assembly 3 slowly expands, compressing the elastic sleeve 23, and the inner diameter of the elastic sleeve 23 begins to decrease. The lower limit of the ratio of the inner diameter of the elastic sleeve 23 to the outer diameter of the core rod portion 21 can be 1.2. During normal use of the battery cell 1, the ratio of the inner diameter of the elastic sleeve 23 to the outer diameter of the core rod 21 can be any value among 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, and 3, or any intermediate value between any two adjacent values ​​mentioned above.

[0109] In the technical solution of this application embodiment, the ratio between the inner diameter of the elastic sleeve 23 and the outer diameter of the core rod 21 fluctuates from 1.2 to 3, which allows the support member 2 to adapt to the volume change caused by the expansion of the electrode assembly 3. When the electrode assembly 3 expands, the maximum compression of the volume of the support member 2 can be 75% of the initial state.

[0110] Furthermore, within the aforementioned floating range, it is preferable that the ratio between the inner diameter of the elastic sleeve 23 and the outer diameter of the core rod 21 floats between 1.5 and 2. This reduces the variation in support force, minimizes the impact of the support member 2 on the battery cell 1, and reduces the volume ratio of the support member 2 in the battery cell 1.

[0111] Please refer to Figure 8 , Figure 8 This is a schematic diagram of the structure of the support member according to some embodiments of this application.

[0112] According to some embodiments of this application, optionally, the end of the elastic support portion 22 away from the core rod portion 21 is provided with a bonding piece 25, the bonding piece 25 is arc-shaped and is spaced apart from the adjacent elastic support portion 22.

[0113] The bonding sheet 25 is a sheet-like material that can be bonded to the electrode assembly 3 and has toughness. Optionally, the bonding sheet 25 is integrally formed with the elastic support portion 22 and is a thin sheet of equal wall thickness extending from the end of the elastic support portion 22 away from the core rod portion 21. The thickness of the sheet can be from 0.1 mm to 3 mm. The bonding sheet 25 can be made of any one of carbon fiber, glass fiber, or boron fiber.

[0114] In the technical solution of this application embodiment, the bonding piece 25 is located at the end of the elastic support portion 22 away from the core rod portion 21, and can be bonded to the electrode assembly 3 between adjacent elastic support portions 22, increasing the bonding area between the support member 2 and the electrode assembly 3, thereby making the supporting force on the electrode assembly 3 more balanced. The bonding piece 25 is spaced apart from the adjacent elastic support portions 22, which allows space for the deformation of the support member 2.

[0115] like Figures 5 to 8 As shown, according to some embodiments of this application, optionally, the number of elastic support portions 22 along the circumference of the core rod portion 21 is not less than 3, and the included angle between adjacent elastic support portions 22 is equal.

[0116] In the circumferential direction of the core rod portion 21, a plurality of elastic support portions 22 are arranged in a circular array. Optionally, the number of elastic support portions 22 can be 3, and the included angle between adjacent elastic support portions 22 is 120°; the number of elastic support portions 22 can be 4, and the included angle between adjacent elastic support portions 22 is 90°; the number of elastic support portions 22 can be 5, and the included angle between adjacent elastic support portions 22 is 72°.

[0117] In the technical solution of this application embodiment, the elastic support 22 is arranged at equal included angles in the circumferential direction of the core rod 21, and the number is not less than 3, which can balance the force on the electrode assembly 3 in the circumferential direction and reduce the difference in deformation of the electrode assembly 3 in the circumferential direction.

[0118] Please refer to Figure 9 and Figure 10 , Figure 9 This is a schematic diagram of the structure in some embodiments of this application, showing that the elastic support portion and the core rod portion are parallel to each other. Figure 10 This is a schematic diagram of the structure of the elastic support portion spiraling around the axis of the core rod in some embodiments of this application.

[0119] According to some embodiments of this application, optionally, the elastic support portion 22 is arranged parallel to the core rod portion 21 along the axial direction of the core rod portion 21, or the elastic support portion 22 is arranged spirally around the core rod portion 21.

[0120] like Figure 9 As shown, in the axial direction of the core rod portion 21, multiple elastic support portions 22 can be arranged in parallel, and all are parallel to the axis of the elastic support portion 22. Figure 10 As shown, multiple elastic support portions 22 can also be arranged in a spiral along the axial direction of the core rod portion 21. When arranged in a spiral, the elastic support portion 22 can be spiraled clockwise or counterclockwise.

[0121] In the technical solution of this application embodiment, the elastic support portion 22 can have various configuration forms along the axial direction of the core rod portion 21. When the elastic support portion 22 is arranged parallel to the core rod portion 21, the circumferential movement of the support member 2 within the electrode assembly 3 can be reduced. When the elastic support portion 22 is spirally arranged around the core rod portion 21, it facilitates the insertion of the support member 2 into the electrode assembly 3.

[0122] According to some embodiments of this application, this application also provides a battery device 100, including a battery cell 1 of any of the above schemes.

[0123] According to some embodiments of this application, this application also provides an electrical device, including a battery device 100 of any of the above schemes, the battery device 100 being used to provide electrical energy to the electrical device.

[0124] The power supply device can be any of the aforementioned devices or systems that utilize battery device 100.

[0125] like Figures 3 to 6As shown, according to some embodiments of this application, this application provides a battery cell 1, which includes a housing 4, an electrode assembly 3, and a support member 2. The housing 4 is provided with a receiving cavity, and the electrode assembly 3 is disposed in the receiving cavity. The electrode assembly 3 has a cylindrical wound structure and a central hole is formed in the center. The support member 2 is disposed in the central hole and includes a core rod portion 21, at least three elastic support portions 22, and an elastic sleeve 23. The elastic support portions 22 are connected to the outer peripheral surface of the core rod portion 21, and a buffer space 24 is formed between adjacent elastic support portions 22. From the core rod portion 21 to the electrode assembly 3, the thickness of the elastic support portion 22 gradually decreases, and the first surface 221 of the elastic support portion 22 in the thickness direction is a smooth convex surface, and the second surface 222 is a smooth concave surface. The first surface 221 is tangential to the outer peripheral surface of the core rod portion 21. The elastic sleeve 23 is located between the elastic support portion 22 and the electrode assembly 3. The elastic sleeve 23 fits snugly against the electrode assembly 3, and the elastic support portion 22 abuts against the elastic sleeve 23, supporting the electrode assembly 3 through the elastic sleeve 23. The elastic sleeve 23 expands or contracts with the deformation of the elastic support portion 22. When the electrode assembly 3 expands and its volume increases, the buffer space 24 is compressed, the elastic support portion 22 deforms, the rebound force increases, and the supporting force of the support member 2 on the electrode assembly 3 increases slowly, which can effectively prevent the electrode assembly 3 from collapsing. The support member 2 can adapt to the volume change of the electrode assembly 3, not only providing space for the expansion of the electrode assembly 3 and relieving the expansion force, but also providing support for the electrode assembly 3, reducing the risk of structural collapse of the electrode assembly 3 caused by stress concentration, thereby improving the reliability of the battery cell 1, extending the service life of the battery cell 1, and improving the performance of the battery cell 1.

[0126] 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 by, The battery cell comprises a support, an electrode assembly and a shell, the support and the electrode assembly are arranged in the shell, the support comprises a core rod part and a plurality of elastic support parts, the plurality of elastic support parts are connected to the outer circumferential surface of the core rod part and are distributed at intervals, a buffer space is formed between adjacent elastic support parts, and the electrode assembly is wound on the outer circumferential side of the support and abuts against the plurality of elastic support parts. The thickness of the elastic support part gradually decreases from the core rod part to the electrode assembly.

2. The battery cell of claim 1, wherein, At least one side of the elastic support part is tangent to the outer circumferential surface of the core rod part in the two side surfaces in the thickness direction.

3. The battery cell according to claim 1 or 2, characterized in that, The length of the side surface from the core rod part to the electrode assembly is not greater than two-thirds of the outer circumferential surface of the core rod part in the two side surfaces in the thickness direction.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The two side surfaces of the elastic support part in the thickness direction comprise a first surface and a second surface, the first surface is a smooth convex curved surface, and the second surface is a smooth concave curved surface.

5. The battery cell according to any one of claims 1 to 4, characterized in that, The first vertical line is a first vertical line, and the second vertical line is a second vertical line, and the distance between the first vertical line and the second vertical line gradually decreases in the direction away from the elastic support part.

6. The battery cell of claim 5, wherein, The elastic support part and the core rod part are formed integrally, and the contact area of the first surface and the electrode assembly is within the range of less than one-half of the area of the first surface.

7. The battery cell according to claim 5 or 6, characterized in that, The elastic support part is provided with a third surface abutting against the core rod part, the third surface is an arc surface, and the arc length is not greater than one-third of the outer circumferential surface of the core rod part.

8. The battery cell of any one of claims 1 to 7, wherein, The support further comprises an elastic sleeve, the elastic sleeve is located between the elastic support part and the electrode assembly and abuts against the elastic support part and the electrode assembly respectively, the elastic sleeve is provided with a plurality of exchange holes in the radial direction, and the exchange holes penetrate through the elastic sleeve.

9. The battery cell of any one of claims 1 to 8, wherein, The floating range of the ratio between the inner diameter of the elastic sleeve and the outer diameter of the core rod part is 1.2 to 3.

10. The battery cell of claim 9, wherein, The end of the elastic support part away from the core rod part is provided with an abutting piece, the abutting piece is arc-shaped, and is arranged at intervals with adjacent elastic support parts.

11. The battery cell of any one of claims 1 to 8, wherein, The number of elastic support parts along the circumferential direction of the core rod part is not less than 3, and the included angles between adjacent elastic support parts are equal.

12. The battery cell of any one of claims 1 to 11, wherein, The elastic support part is arranged in parallel with the core rod part along the axial direction of the core rod part, or the elastic support part is arranged spirally around the core rod part.

13. The battery cell of any one of claims 1 to 12, wherein, The battery cell as claimed in any one of claims 1 to 13.

14. A battery device characterized by comprising: The battery device as claimed in claim 14 is used to provide electric energy.

15. An electrical device, comprising: ​

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