Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, a shell, a support and a first insulation piece. The shell houses the electrode assembly, and the shell comprises a first wall. The support is arranged in the shell and located between the first wall and the electrode assembly. The support is provided with a first through hole. The support has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly. The first through hole penetrates the first surface and the second surface. The first insulation piece is at least partially attached to the second surface and completely covers the first through hole. The application can improve the reliability of the battery monomer.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] Among battery cells, the reliability of battery cells has always been a topic of great concern. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device to improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell including an electrode assembly, a housing, a support member, and a first insulating member. The housing houses the electrode assembly and includes a first wall. The support member is disposed within the housing, located between the first wall and the electrode assembly. The support member has a first through hole and has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly. The first through hole penetrates the first surface and the second surface. The first insulating member is at least partially adhered to the second surface and completely covers the first through hole.

[0006] By attaching at least a portion of the first insulating component to the surface of the support component away from the electrode assembly and completely covering the through hole, the first insulating component seamlessly seals the through hole, effectively preventing decarbonization inside the battery cell from passing through the through hole, reducing the risk of thermal runaway caused by decarbonization short circuit, and improving the reliability of the battery cell.

[0007] In some embodiments, the support includes a support plate and a pad, the pad being connected to the side of the support plate opposite to the electrode assembly.

[0008] By connecting the pad to the side of the support plate away from the electrode assembly, the distance between the support plate and the first wall can be increased. With the pressure relief mechanism set on the first wall, the exhaust space of the pressure relief mechanism can be increased, which not only helps to improve exhaust efficiency, but also reduces the residence time of gas inside the battery cell, reduces the risk of thermal diffusion, and improves the reliability of the battery cell.

[0009] In some embodiments, the first surface is the surface of the support plate facing the electrode assembly, and the second surface is the surface of the support plate away from the electrode assembly; along the length direction of the support plate, the first through hole is offset from the pad.

[0010] By offsetting the first through hole from the pad along the length of the support plate, the pad avoids the first through hole. When the first insulating component is attached to the surface of the support plate away from the electrode assembly, it can completely cover the first through hole, achieving a seamless seal. This effectively prevents decarburization inside the battery cell from passing through the first through hole, reducing the risk of thermal runaway caused by decarburization short circuit and improving the reliability of the battery cell. Furthermore, because the first through hole and the pad are offset, the area near the first through hole is completely exposed, and the pad does not interfere with this area. This facilitates precise positioning of the support plate, improves the assembly accuracy of the first insulating component, reduces the risk of short circuit caused by assembly deviation between the electrode assembly and the casing, and enhances the reliability of the battery cell.

[0011] In some embodiments, two first through holes are provided, and the pad is located between the two first through holes along the length direction of the support plate.

[0012] Two first through holes are provided along the length of the support plate. The pad is located between the two first through holes, so that the pad avoids the two first through holes. Thus, when the first insulating member is pasted on the surface of the support plate away from the electrode assembly, it can completely cover the first through hole, so as to achieve the effect of seamless sealing of the first through hole.

[0013] In some embodiments, the number of pads is four, and the four pads are arranged in two rows and two columns. Two pads in each row are spaced apart along the length direction of the support plate, and two pads in each column are spaced apart along the width direction of the support plate. The four pads are located between the two first through holes.

[0014] By positioning the four pads along the length of the support plate between the two first through holes, the four pads avoid the two first through holes. Thus, when the first insulating component is pasted onto the surface of the support plate away from the electrode assembly, it can completely cover the first through holes, achieving a seamless seal. The arrangement of the four pads in two rows and two columns also improves the assembly accuracy and stability of the support component.

[0015] In some embodiments, the orthographic projection of the first insulating member and the orthographic projection of the pad do not overlap in the same projection plane perpendicular to the thickness direction of the support plate.

[0016] Therefore, the pad does not interfere with the first insulating component, and the first insulating component can better and completely cover the first through hole, further improving the seamless sealing effect of the first insulating component on the first through hole, thereby improving the reliability of the battery cell.

[0017] In some embodiments, the first surface is the surface of the support plate facing the electrode assembly, and the second surface is the surface of the pad facing away from the electrode assembly.

[0018] The first surface is the surface of the support plate facing the electrode assembly, and the second surface is the surface of the pad facing away from the electrode assembly. The first insulating member is attached to the surface of the pad facing away from the electrode assembly and completely covers the first through hole. When the pad abuts against the first wall, the first insulating member is located between the pad and the first wall, which improves the bonding strength.

[0019] In some embodiments, two pads are provided, and the two pads are spaced apart along the length direction of the support plate, and each pad is provided with a first through hole.

[0020] By using two spacers, which are spaced apart along the length of the support plate, the assembly accuracy of the support components and the stability of the support can be improved.

[0021] In some embodiments, the pad includes a first pad and a second pad, the second surface being the surface of the first pad facing away from the electrode assembly, and the second pad not having the first through hole.

[0022] The pad includes a first pad and a second pad, the second surface of which is the surface of the first pad that faces away from the electrode assembly, and the second pad does not have a first through hole, which can improve the support stability of the support component.

[0023] In some embodiments, two first pads are provided, and the two first pads are spaced apart along the length direction of the support plate; along the length direction of the support plate, a second pad is provided between the two first pads.

[0024] Two first pads are provided, each with a first through hole along the length of the support plate. A second pad is placed between the two first pads, which can improve the positioning accuracy of the support component, improve the assembly precision, and also improve the stability of the support.

[0025] In some embodiments, the number of the second pads is four, and the four second pads are arranged in two rows and two columns. Two second pads in each row are spaced apart along the length direction of the support plate, and two second pads in each column are spaced apart along the width direction of the support plate.

[0026] There are four second pads, arranged in two rows and two columns, which can further improve the support stability of the support component.

[0027] In some embodiments, the orthographic projection of the first insulating member and the orthographic projection of the second pad do not overlap in the same projection plane perpendicular to the thickness direction of the support plate.

[0028] Therefore, the second pad does not interfere with the first insulating component, and can better and completely cover the first through hole on the first pad, further improving the seamless sealing effect of the first insulating component on the first through hole, thereby improving the reliability of the battery cell.

[0029] In some embodiments, the battery cell further includes: a second insulating member that at least partially encloses the electrode assembly, the second insulating member having a second through hole corresponding to the first through hole; the first surface being connected to the second insulating member.

[0030] The support component enables precise positioning through the first and second through holes, improving assembly accuracy and reducing the risk of short circuits between the electrode assembly and the casing due to assembly misalignment, thereby enhancing the reliability of the battery cell.

[0031] In some embodiments, one end of the first insulating member is attached to the second surface, and the other end is attached to the second insulating member.

[0032] By attaching one end of the first insulating component to the second surface and the other end to the second insulating component, the risk of displacement of the support component due to vibration or collision during transportation or use of the battery cell can be effectively reduced. At the same time, it can also enhance the sealing between the battery cell and the support component and improve the reliability of the battery cell.

[0033] In some embodiments, the housing includes a shell and an end cap, the shell having an opening and the end cap covering the opening; the shell includes a bottom wall and a side wall, the side wall surrounding the bottom wall, the bottom wall being disposed opposite to the end cap, and the first wall being the bottom wall; the battery cell further includes electrode terminals and a pressure relief mechanism, the electrode terminals being disposed on the end cap and the pressure relief mechanism being disposed on the bottom wall.

[0034] The first wall is the bottom wall, and the pressure relief mechanism is located on the bottom wall. The space between the support plate and the bottom wall can be increased by the pad, thereby providing more venting space for the pressure relief mechanism, reducing the risk of thermal runaway and improving the reliability of the battery cell.

[0035] In some embodiments, the first insulating element is insulating tape.

[0036] The first insulating component is made of insulating adhesive paper, which makes the material readily available and ensures high bonding reliability.

[0037] Secondly, embodiments of this application provide a battery device, including the battery cell described in any one of the embodiments of the first aspect.

[0038] Thirdly, embodiments of this application provide an electrical device, including a single battery cell as described in any of the embodiments of the first aspect or a battery device as described in the second aspect.

[0039] 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, specific embodiments of this application are given below. Attached Figure Description

[0040] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0042] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0043] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0044] Figure 4 This is a schematic diagram of the structure of a battery cell without its outer casing, provided in some embodiments of this application;

[0045] Figure 5 A side view of a battery cell without its casing provided in some embodiments of this application;

[0046] Figure 6 A schematic diagram of the structure of the support for a battery cell provided in some embodiments of this application;

[0047] Figure 7 A schematic diagram of the structure of a first insulating member of a battery cell being attached to a support member, provided in some embodiments of this application;

[0048] Figure 8 A schematic diagram of the structure of the support for a battery cell provided in other embodiments of this application;

[0049] Figure 9 A schematic diagram of the structure of a first insulating element of a battery cell being attached to a pad according to other embodiments of this application;

[0050] Figure 10 A schematic diagram of the structure of a battery cell support provided in some embodiments of this application;

[0051] Figure 11This is a schematic diagram of the structure of a first insulating element of a battery cell being attached to a pad, as provided in some embodiments of this application.

[0052] icon:

[0053] 1000 - Vehicle; 100 - Battery unit; 200 - Controller; 300 - Motor; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Outer shell; 211 - Housing; 212 - End cap; 213 - First wall; 2111 - Bottom wall; 2112 - Side wall; 22 - Electrode assembly; 23 - Support; 23a - First surface; 23b - Second surface; 231 - Support plate; 232 - Pad; 2321 - First pad; 2322 - Second pad; 233 - First through hole; 24 - First insulator; 25 - Second insulator; 251 - Second through hole; 26 - Electrode terminal; 27 - Pressure relief mechanism; 28 - Adapter; 29 - First plastic part; 210 - Second plastic part. Detailed Implementation

[0054] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

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

[0056] The terms "first," "second," etc., in the specification and the above-mentioned figures are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0057] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0058] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0059] 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, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0060] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0061] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0062] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0063] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0064] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0065] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0066] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0067] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0068] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0069] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0070] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0071] The battery cell may be, but is not limited to, 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.

[0072] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0073] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), or composite metal (such as a copper-aluminum composite housing).

[0074] In some embodiments, the housing includes an end cap assembly and a housing with an opening. The end cap assembly includes an end cap and electrode terminals disposed on the end cap. The end cap closes the opening to form a sealed space for accommodating the electrode assembly and substances such as electrolytes. The housing may have one or more openings. One or more end caps may also be provided.

[0075] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be provided on the end cap or on the housing.

[0076] In some embodiments, the electrode terminal may include a post and a conductive element, the post being electrically connected to the conductive element and the electrode assembly.

[0077] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell, and the explosion-proof valve can be provided on the end cap or on the housing.

[0078] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0079] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0080] In a battery cell, a support component can be installed between the electrode assembly and the casing to elevate the electrode assembly and prevent interference at the bottom corner (R-angle) of the casing. When a pressure relief mechanism is installed on the bottom wall of the casing, the support component can also increase the venting space of the pressure relief mechanism, which not only helps improve venting efficiency but also reduces the residence time of gas inside the battery cell, lowering the risk of thermal runaway and improving the reliability of the battery cell. To improve the assembly accuracy of the support component, through holes for positioning can be provided. However, these through holes expose the internal structure of the battery cell, potentially causing decarburization inside the cell to fall through the through holes and contact the casing, easily leading to a decarburization short circuit risk. A decarburization short circuit not only affects the electrical performance of the battery cell but may also trigger thermal runaway, reducing the reliability of the battery cell.

[0081] In this embodiment, the first insulating member is at least partially attached to the surface of the support member away from the electrode assembly and completely covers the through hole, so that the first insulating member seamlessly seals the through hole, effectively blocking decarbonization inside the battery cell through the through hole, reducing the risk of thermal runaway caused by decarbonization short circuit, and improving the reliability of the battery cell.

[0082] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0083] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0084] 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.

[0085] Reference Figure 1 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 unit 100 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. The battery unit 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation.

[0086] 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, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0087] 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.

[0088] Reference Figure 2 The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, collectively defining a storage space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 together define the storage space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 overlapping the open side of the second sub-housing 12.

[0089] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between multiple battery cells.

[0090] Reference Figure 3 The battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components. The housing 21 may include a casing 211 and an end cap 212. The casing 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0091] The housing 211 is an assembly used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 may contain one or more electrode assemblies 22. The housing 211 and the end cap 212 can be independent components. The housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly. The housing 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0092] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, enabling battery cell 20 to have higher structural strength and improved reliability. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0093] In some embodiments, an insulating structure may be provided on the inner side of the end cap 212. The insulating structure can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0094] Below, refer to Figures 3 to 10The battery cell 20 of the present application embodiment will be described in detail.

[0095] This application provides a battery cell 20, including a housing 21, an electrode assembly 22, a support member 23, and a first insulating member 24. The housing 21 houses the electrode assembly 22 and includes a first wall 213. The support member 23 is disposed inside the housing 21, located between the first wall 213 and the electrode assembly 22. The support member 23 has a first through hole 233 and has a first surface 23a facing the electrode assembly 22 and a second surface 23b facing away from the electrode assembly 22. The first through hole 233 penetrates the first surface 23a and the second surface 23b. The first insulating member 24 is at least partially attached to the second surface 23b and completely covers the first through hole 233.

[0096] The electrode assembly 22 can be a wound structure or a stacked structure. The battery cell 20 can be a square battery cell 20. For example, the electrode assembly 22 can be flat. When the electrode assembly 22 is a wound structure, the electrode assembly 22 includes a straight area and a bent area.

[0097] The housing 21 may include a housing 211 and an end cap 212, the housing 211 having an opening and the end cap 212 covering the opening. The first wall 213 may be the bottom wall 2111 of the housing 211.

[0098] The support member 23 supports the electrode assembly 22, which can be supported on the first surface 23a of the support member 23 facing the electrode assembly 22. The support member 23 is provided with a first through hole 233, which can be used to position the support member 23. One or more first through holes 233 can be provided. For example, two first through holes 233 are provided, spaced apart along the length direction X of the support member, and each first through hole can be located at the middle position along the width direction Y of the support member. The support member 23 is made of an insulating material, such as plastic.

[0099] The support member 23 can directly support the electrode assembly 22, or support the electrode assembly 22 through the second insulating member 25.

[0100] For example, refer to Figure 3 The electrode assembly 22 can be at least partially enclosed by the second insulating member 25, which can be a Mylar film. The second insulating member 25 has a second through hole 251 corresponding to the first through hole 233. During assembly of the support member 23, the support member 23 and the second insulating member 25 can be positioned by passing a locating pin through the first through hole 233 on the support member 23 and the second through hole 251 on the second insulating member 25. Then, the support member 23 and the second insulating member 25 can be connected by heat fusion, and finally, the locating pin is removed.

[0101] The first insulating member 24 can be entirely or partially adhered to the second surface 23b. Completely covering the first through-hole 233 with the first insulating member 24 means that the first insulating member 24 seamlessly seals the first through-hole 233. As an example, the area of ​​the second surface 23b at least surrounding the first through-hole 233 can be a planar area, and the first insulating member 24 is at least partially adhered to this planar area. The first insulating member 24 can be adhesive tape, film, etc.

[0102] The first insulating member 24 is at least partially attached to the second surface 23b of the support member 23 away from the electrode assembly 22, and the first insulating member 24 completely covers the first through hole 233, so that the first insulating member 24 seamlessly seals the first through hole 233, effectively blocking the decarbonization inside the battery cell 20 from passing through the first through hole 233, reducing the risk of thermal runaway caused by decarbonization short circuit, and improving the reliability of the battery cell 20.

[0103] In some embodiments, the support member 23 includes a support plate 231 and a pad 232, the pad 232 being connected to the side of the support plate 231 away from the electrode assembly 22.

[0104] The spacer 232 can be bonded to the support plate 231 or integrally formed. The support plate 231 can be a plate-like structure. The length and width of the support plate 231 can be adapted to the length and width of the electrode assembly 22. The spacer 232 can be a strip-shaped structure, a square structure, a cylindrical structure, etc. The number of spacers 232 can be one or more. The spacer 232 can abut against the first wall 213 to create a gap between the support plate 231 and the first wall 213.

[0105] By connecting the pad 232 to the side of the support plate 231 away from the electrode assembly 22, the distance between the support plate 231 and the first wall 213 can be increased. When the first wall 213 is equipped with a pressure relief mechanism 27 (such as an explosion-proof valve), the exhaust space of the pressure relief mechanism 27 can be increased, which not only helps to improve the exhaust efficiency, but also reduces the residence time of gas inside the battery cell 20, reduces the risk of thermal diffusion, and improves the reliability of the battery cell 20.

[0106] In some embodiments, the first surface 23a is the surface of the support plate 231 facing the electrode assembly 22, and the second surface 23b is the surface of the support plate 231 away from the electrode assembly 22; along the length direction X of the support plate 231, the first through hole 233 is staggered from the pad 232.

[0107] The first surface 23a is the surface of the support plate 231 facing the electrode assembly 22, and the second surface 23b is the surface of the support plate 231 away from the electrode assembly 22, so that the first through hole 233 penetrates the support plate 231 and the first insulating member 24 is attached to the support plate 231.

[0108] Along the length X of the support plate 231, the first through hole 233 and the pad 232 are staggered, which can be understood as the pad 232 near the first through hole 233 having a distance a between it and the first through hole 233. Figure 6 As shown in the figure, the end of the pad 232 near the first through hole 233 does not exceed or cross the first through hole 233, so that the pad 232 forms an inward shortened structure, thereby avoiding the first through hole 233.

[0109] By offsetting the first through hole 233 from the pad 232 along the length X of the support plate 231, the pad 232 avoids the first through hole 233. When the first insulating member 24 is attached to the surface of the support plate 231 away from the electrode assembly 22, it can completely cover the first through hole 233, achieving a seamless seal of the first through hole 233. This effectively prevents decarbonization inside the battery cell 20 from passing through the first through hole 233, reducing the risk of thermal runaway caused by decarbonization short circuit and improving the reliability of the battery cell 20. Furthermore, since the first through hole 233 and the pad 232 are offset, the area near the first through hole 233 is completely exposed, and the pad 232 does not interfere with this area. This facilitates the precise positioning of the support plate 231, which is beneficial to the assembly accuracy of the first insulating member 24. It also reduces the risk of short circuit caused by the electrode assembly 22 contacting the outer casing 21 due to assembly deviation, thus improving the reliability of the battery cell 20.

[0110] In some embodiments, refer to Figure 6 and Figure 7 There are four pads 232, arranged in two rows and two columns. Two pads 232 in each row are spaced apart along the length of the support plate 231, and two pads 232 in each column are spaced apart along the width Y direction of the support plate 231. There are two first through holes 233, along the length X direction of the support plate 231, and all four pads 232 are located between the two first through holes 233.

[0111] The four pads 232 can be the same or different in size and shape. There can be two first insulating members 24. The two first insulating members 24 are attached to the surface of the support plate 231 away from the electrode assembly 22 and completely cover the two first through holes 233 respectively, so as to achieve the effect of seamlessly sealing the two first through holes 233.

[0112] The four pads 232 can have the same size along the thickness direction of the support plate 231, so that all four pads 232 can abut against the first wall 213, thereby improving the support stability of the support plate 231.

[0113] Two first through holes 233 are provided. Along the length direction X of the support plate 231, four pads 232 are located between the two first through holes 233, so that the four pads 232 avoid the two first through holes 233. The first through holes 233 are not located between the two pads 232 along the width direction Y. Thus, when the first insulating member 24 is pasted on the surface of the support plate 231 away from the electrode assembly 22, it can completely cover the first through hole 233, so as to achieve the effect of seamless sealing of the first through hole 233. The arrangement of the four pads 232 in two rows and two columns can also improve the assembly accuracy and support stability of the support member 23.

[0114] In some embodiments, refer to Figure 7 In the same projection plane perpendicular to the thickness direction Z of the support plate 231, the orthographic projection of the first insulating element 24 does not overlap with the orthographic projection of the pad block 232.

[0115] Therefore, the pad 232 does not interfere with the first insulating member 24, and the first insulating member 24 can better and completely cover the first through hole 233, further improving the effect of the first insulating member 24 in seamlessly sealing the first through hole 233, thereby improving the reliability of the battery cell 20.

[0116] In some embodiments, the first surface 23a is the surface of the support plate 231 facing the electrode assembly 22, and the second surface 23b is the surface of the pad 232 facing away from the electrode assembly 22.

[0117] The first surface 23a is the surface of the support plate 231 facing the electrode assembly 22, and the second surface 23b is the surface of the pad 232 facing away from the electrode assembly 22, so that the first through hole 233 passes through both the support plate 231 and the pad 232. The first insulating member 24 is attached to the surface of the pad 232 facing away from the electrode assembly 22 and completely covers the first through hole 233.

[0118] As an example, the pad 232 can cover the area around the support plate 231 located in the first through hole 233. For example, along the length direction X of the support plate 231, one end of the pad 232 extends to the edge of the support plate 231 near the first through hole 233, and along the width direction Y of the support plate 231, both ends of the pad 232 extend to the two edges of the support plate 231 respectively, so that the pad 232 forms an integral structure so that the first insulating member 24 is attached to the surface of the pad 232 away from the electrode assembly 22 and completely covers the first through hole 233.

[0119] The first surface 23a is the surface of the support plate 231 facing the electrode assembly 22, and the second surface 23b is the surface of the pad 232 facing away from the electrode assembly 22. The first insulating member 24 is pasted on the surface of the pad 232 facing away from the electrode assembly 22 and completely covers the first through hole 233. When the pad 232 abuts against the first wall 213, the first insulating member 24 is located between the pad 232 and the first wall 213, which improves the bonding firmness.

[0120] In some embodiments, a pad 232 is provided, extending along the length X of the support plate 231, with both ends of the pad 232 reaching the two sides of the support plate 231, thus forming an integral pad 232. The integral pad 232 has two first through holes 233, which are spaced apart along the length X of the support plate 231. The two first through holes 233 can be positioned close to both ends of the pad 232 along the length X of the support plate 231.

[0121] In some embodiments, refer to Figure 8 and Figure 9 There are two pads 232, which are spaced apart along the length X of the support plate 231. Each pad 232 has a first through hole 233.

[0122] Two first insulating elements 24 can be provided. Each first insulating element 24 is attached to the surface of the pad 232 away from the electrode assembly 22 and completely covers the two first through holes 233 respectively, so as to achieve the effect of seamlessly sealing the two first through holes 233.

[0123] Two pads 232 are provided, and the two pads 232 are spaced apart along the length direction X of the support plate 231, which can improve the assembly accuracy and support stability of the support component 23.

[0124] In some embodiments, the pad 232 includes a first pad 2321 and a second pad 2322, the second surface 23b is the surface of the first pad 2321 that is away from the electrode assembly 22, and the second pad 2322 is not provided with a first through hole 233.

[0125] The second surface 23b is the surface of the first pad 2321 that is away from the electrode assembly 22, so that the first through hole 233 simultaneously penetrates the first pad 2321 of the support plate 231. The first insulating member 24 is attached to the surface of the first pad 2321 that is away from the electrode assembly 22 and completely covers the first through hole 233.

[0126] The number of second pads 2322 can be one or more. The pads 232 include first pads 2321 and second pads 2322, so that the pads 232 have a distributed structure. The dimensions of the first pads 2321 and the second pads 2322 along the thickness direction of the support plate 231 can be the same.

[0127] The pad 232 includes a first pad 2321 and a second pad 2322. The second surface 23b is the surface of the first pad 2321 that is away from the electrode assembly 22. The second pad 2322 does not have a first through hole 233, which can improve the support stability of the support member 23.

[0128] In some embodiments, refer to Figure 10 and Figure 11 There are two first pads 2321, which are spaced apart along the length X of the support plate 231. Each first pad 2321 has a first through hole 233. A second pad 2322 is disposed between the two first pads 2321 along the length X of the support plate 231.

[0129] The number of second pads 2322 can be one or more. Two first insulating members 24 can be provided. The two first insulating members 24 are attached to the surface of the first pad 2321 away from the electrode assembly 22 and completely cover the two first through holes 233 respectively, so as to achieve the effect of seamless sealing of the first through holes 233.

[0130] Two first pads 2321 are provided, each with a first through hole 233 along the length X of the support plate 231. A second pad 2322 is provided between the two first pads 2321, which can improve the positioning accuracy of the support 23, improve the assembly precision, and also improve the support stability.

[0131] In some embodiments, refer to Figure 10 and Figure 11 There are four second pads 2322, arranged in two rows and two columns. Two second pads 2322 in each row are spaced apart along the length direction X of the support plate 231, and two second pads 2322 in each column are spaced apart along the width direction Y of the support plate 231.

[0132] There are four second pads 2322, which are arranged in two rows and two columns to further improve the support stability of the support member 23.

[0133] In some embodiments, the orthographic projection of the first insulating member 24 and the orthographic projection of the second pad 2322 do not overlap in the same projection plane perpendicular to the thickness direction Z of the support plate 231.

[0134] Therefore, the second pad 2322 does not interfere with the first insulating member 24, and can better and completely cover the first through hole 233 on the first pad 2321, further improving the effect of the first insulating member 24 in seamlessly sealing the first through hole 233, thereby improving the reliability of the battery cell 20.

[0135] In some embodiments, the battery cell 20 further includes a second insulating member 25, which at least partially encloses the electrode assembly 22. The second insulating member 25 is provided with a second through hole 251 corresponding to the first through hole 233. The first surface 23a is connected to the second insulating member 25.

[0136] The second insulating member 25 can cover the sides and bottom of the electrode assembly 22. The support member 23 is connected to the second insulating member 25 through a first surface 23a facing the electrode assembly 22. The first surface 23a and the second insulating member 25 can be connected by means of bonding, heat fusion, etc.

[0137] The support member 23 can achieve precise positioning through the first through hole 233 and the second through hole 251, thereby improving the assembly accuracy, reducing the risk of short circuit between the electrode assembly 22 and the shell 21 caused by assembly misalignment, and improving the reliability of the battery cell 20.

[0138] In some embodiments, one end of the first insulating member 24 is attached to the second surface 23b, and the other end is attached to the second insulating member 25.

[0139] As an example, refer to Figure 4 and Figure 5 One end of the first insulating member 24 is attached to the second surface 23b of the support member 23 that is away from the electrode assembly 22, and the other end is attached to the side of the second insulating member 25 that corresponds to the narrow surface of the electrode assembly 22, so that the first insulating member 24 is located at the corner of the electrode assembly 22.

[0140] By positioning the first insulating member 24 at the corner of the electrode assembly 22, the first insulating member 24 is attached to the support member 23 at the corner, which can effectively reduce the risk of displacement of the support member 23 due to vibration or collision during transportation or use of the battery cell 20. At the same time, it can also enhance the sealing between the battery cell 20 and the support member 23 and improve the reliability of the battery cell 20.

[0141] In some embodiments, refer to Figure 3The outer casing 21 includes a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 covers the opening. The housing 211 includes a bottom wall 2111 and a side wall 2112. The side wall 2112 surrounds the bottom wall 2111, and the bottom wall 2111 is disposed opposite to the end cap 212. A first wall 213 is the bottom wall 2111. The battery cell 20 also includes an electrode terminal 26 and a pressure relief mechanism 27. The electrode terminal 26 is disposed on the end cap 212, and the pressure relief mechanism 27 is disposed on the bottom wall 2111. The electrode terminal 26 is electrically connected to the electrode assembly 22. The electrode terminal 26 can be directly connected to the electrode assembly 22, or indirectly connected to the electrode assembly 22 through an adapter 28. A first plastic part 29, also known as the "lower plastic part," is disposed on the side (inner side) of the end cap 212 facing the electrode assembly 22, which is used to isolate and insulate the end cap 212 from the electrode assembly 22 inside the housing 211. A second plastic part 210 is provided on the side (outer side) of the end cap 212 opposite to the electrode assembly 22, located between the end cap 212 and the electrode terminal 26. Figure 4 and Figure 5 As shown), the so-called "upper plastic part" is used for insulating end cap 212 and electrode terminal 26.

[0142] The first wall 213 is the bottom wall 2111. The pressure relief mechanism 27 is set on the bottom wall 2111. The space between the support plate 231 and the bottom wall 2111 can be increased by the pad block 232, thereby providing more exhaust space for the pressure relief mechanism 27, reducing the risk of thermal runaway diffusion, and improving the reliability of the battery cell 20.

[0143] This application provides a battery device 100, including a battery cell 20 of any of the above embodiments, the battery cell 20 being used to provide electrical energy.

[0144] This application provides an electrical device, including a battery cell 20 or a battery device 100 as described in any of the above embodiments, wherein the battery device 100 is used to provide electrical energy.

[0145] Reference Figures 3 to 11 This application provides a battery cell 20 that allows a first insulating member 24 (such as adhesive tape) to completely cover the first through hole 233 on the support member 23, thereby improving the reliability of the battery cell 20.

[0146] The battery cell 20 may be provided with a support member 23, which includes a support plate 231 and a pad 232. The pad 232 can increase the venting space inside the pressure relief mechanism 27 and reduce the risk of thermal runaway propagation. The support plate 231 is provided with a first through hole 233 for positioning with the second through hole 251 of the second insulating member 25 (Mylar film). In conventional solutions, the first through hole 233 is arranged between two pads 232 along the width Y direction of the support plate 231. While this effectively increases the venting space inside the electrode assembly 22, it also causes the first insulating member 24, which is attached to the two pads 232, to fail to completely cover the first through hole 233. Specifically, because the pads 232 are higher than the support plate 231, the first insulating member 24 interferes with the two pads 232. Even if the first through hole 233 is covered, it cannot be completely sealed, leaving a gap between the first insulating member 24 and the first through hole 233. This exposes the internal structure of the battery cell 20 through the first through hole 233, potentially causing the carbon material inside the battery cell 20 to come into contact with the external environment (such as with the outer casing 21), leading to decarbonization and short circuits. Decarbonization and short circuits not only severely affect the electrical performance of the battery cell 20 but may also trigger thermal runaway, further threatening the performance and lifespan of the battery cell 20. Therefore, this application proposes three support member 23 structures: a shortened structure (…). Figure 6 As shown), integral structure ( Figure 8 (as shown) and distributed structure ( Figure 10 As shown), all three types of support members 23 can completely cover the first through hole 233 with the first insulating member 24 (adhesive paper), that is, seamlessly seal the first through hole 233, reduce the risk of internal decarbonization and short circuit in the battery cell 20, and improve the reliability of the battery cell 20.

[0147] Reference Figure 6 and Figure 7The support member 23 has a shortened structure. By optimizing the spatial layout of the support plate 231 and the pad 232, the length of the pads 233 located on both sides of the first through hole 233 is shortened. This allows the pads 232 to be staggered from the first through hole 233 along the length X of the support plate 231, thus avoiding the area around the first through hole 233 on the support plate 231 used for attaching the first insulating member 24. The first insulating member 24 and the pad 232 no longer interfere with each other, allowing the first insulating member 24 (adhesive tape) to completely cover the support plate 231 when it is attached to the support plate 231. The first through hole 233 on component 23 is seamlessly sealed, effectively suppressing the risk of short circuit caused by decarbonization or electrolyte leakage inside the battery cell 20. In addition, it can also improve assembly accuracy. Since the traditional pad 232 is too long and easily causes spatial conflict with the first through hole 233, after shortening the pad 232, the area around the support plate 231 around the first through hole 233 is fully exposed, which is convenient for precise alignment by positioning pins, significantly reducing the risk of electrode short circuit caused by misalignment. Thus, the reliability of the battery cell 20 can be improved.

[0148] Reference Figure 8 and Figure 9 The support component 23 is an integral structure. A whole pad 232 is set on both sides along the length direction X of the support plate 231. Each pad 232 is provided with a first through hole 233 that penetrates the support plate 231 and the pad 232, so that the first insulating component 24 (adhesive tape) can be directly pasted to the pad 232 and completely cover the first through hole 233. Thus, the first insulating component 24 can seamlessly seal the first through hole 233, effectively suppressing the risk of short circuit caused by decarbonization or electrolyte leakage inside the battery cell 20 and improving the reliability of the battery cell 20.

[0149] Reference Figure 10 and Figure 11 The support component 23 has a distributed structure. A first pad 2321 is set on each side along the length direction X of the support plate 231. Each first pad 2321 is provided with a first through hole 233 penetrating the support plate 231 and the first pad 2321. At the same time, four second pads 2322 are arranged in two rows and two columns between the two first pads 2321, so that the first insulating component 24 (adhesive tape) can be directly pasted to the first pad 2321 and completely cover the first through hole 233 on the first pad 2321. Thus, the first insulating component 24 can seamlessly seal the first through hole 233, effectively suppressing the risk of short circuit caused by decarbonization or electrolyte leakage inside the battery cell 20 and improving the reliability of the battery cell 20.

[0150] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of this application.

Claims

1. A battery cell, characterized in that, include: Electrode assembly; A housing for accommodating the electrode assembly, the housing including a first wall; A support member is disposed within the housing and located between the first wall and the electrode assembly. The support member has a first through hole and has a first surface facing the electrode assembly and a second surface facing away from the electrode assembly. The first through hole penetrates the first surface and the second surface. The first insulating element is at least partially adhered to the second surface and completely covers the first through hole.

2. The battery cell according to claim 1, characterized in that, The support includes a support plate and a pad, the pad being connected to the side of the support plate opposite to the electrode assembly.

3. The battery cell according to claim 2, characterized in that, The first surface is the surface of the support plate facing the electrode assembly, and the second surface is the surface of the support plate facing away from the electrode assembly; Along the length of the support plate, the first through hole is offset from the pad.

4. The battery cell according to claim 3, characterized in that, There are two first through holes, and the pad is located between the two first through holes along the length of the support plate.

5. The battery cell according to claim 4, characterized in that, The number of pads is four, and the four pads are arranged in two rows and two columns. Two pads in each row are spaced apart along the length direction of the support plate, and two pads in each column are spaced apart along the width direction of the support plate. The four pads are located between the two first through holes.

6. The battery cell according to claim 3, characterized in that, In the same projection plane perpendicular to the thickness direction of the support plate, the orthographic projection of the first insulating element does not overlap with the orthographic projection of the pad.

7. The battery cell according to claim 2, characterized in that, The first surface is the surface of the support plate facing the electrode assembly, and the second surface is the surface of the pad facing away from the electrode assembly.

8. The battery cell according to claim 7, characterized in that, Two pads are provided, and the two pads are spaced apart along the length of the support plate. Each pad is provided with a first through hole.

9. The battery cell according to claim 7, characterized in that, The pad includes a first pad and a second pad. The second surface is the surface of the first pad that is away from the electrode assembly, and the second pad does not have the first through hole.

10. The battery cell according to claim 9, characterized in that, There are two first pads, which are spaced apart along the length of the support plate, and each first pad has a first through hole. Along the length of the support plate, the second pad is disposed between the two first pads.

11. The battery cell according to claim 10, characterized in that, The number of the second pads is four, and the four second pads are arranged in two rows and two columns. Two second pads in each row are spaced apart along the length direction of the support plate, and two second pads in each column are spaced apart along the width direction of the support plate.

12. The battery cell according to claim 9, characterized in that, In the same projection plane perpendicular to the thickness direction of the support plate, the orthographic projection of the first insulating element does not overlap with the orthographic projection of the second pad.

13. The battery cell according to claim 1, characterized in that, The battery cell also includes: A second insulating member at least partially encloses the electrode assembly, and the second insulating member is provided with a second through hole corresponding to the first through hole; The first surface is connected to the second insulating element.

14. The battery cell according to claim 13, characterized in that, One end of the first insulating element is attached to the second surface, and the other end is attached to the second insulating element.

15. The battery cell according to claim 1, characterized in that, The housing includes a shell and an end cap, the shell having an opening and the end cap covering the opening; The housing includes a bottom wall and a side wall, the side wall surrounds the bottom wall, the bottom wall is disposed opposite to the end cap, and the first wall is the bottom wall; The battery cell also includes electrode terminals and a pressure relief mechanism. The electrode terminals are disposed on the end cap and electrically connected to the electrode assembly, and the pressure relief mechanism is disposed on the bottom wall.

16. The battery cell according to claim 1, characterized in that, The first insulating component is insulating tape.

17. A battery device, characterized in that, include: The battery cell as described in any one of claims 1-16.

18. An electrical appliance, characterized in that, include: The battery cell as described in any one of claims 1-16 or the battery device as described in claim 17.

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