Battery cell, battery apparatus and electric device

Abstract

A battery cell (10), a battery apparatus (100) and an electric device. The battery cell (10) comprises a casing (11), a pressure relief mechanism (12), an electrode assembly (15), an insulating member (14) and support members (17). The casing (11) comprises a plurality of side walls, which comprise a first side wall (1111), wherein the pressure relief mechanism (12) is disposed on the first side wall (1111) and is configured to open or close according to the internal pressure of the casing (11); the electrode assembly (15) is disposed inside the casing (11); the insulating member (14) is disposed in the casing (11) and is insulated between the casing (11) and the electrode assembly (15); the side of the insulating member (14) facing the electrode assembly (15) comprises protruding structures (143), which abut against the electrode assembly (15); the support members (17) are disposed inside the protruding structures (143) and support the electrode assembly (15) by means of the protruding structures (143); and the melting point of the support members (17) is higher than that of the insulating member (14). When the insulating member (14) is heated and softened, the support members (17) remain unsoftened to support the electrode assembly (15), such that during pressure relief, the occurrence of short-circuiting of the electrode assembly (15) caused by sharp portions on the insulating member (14) piercing the electrode assembly (15) due to displacement of the electrode assembly (15) is reduced.

Description

Battery cells, battery devices and electrical equipment

[0001] Cross-references to related applications

[0002] This application claims priority and benefit from the following patent applications, the entire contents of which are incorporated herein by reference:

[0003] A Chinese patent application filed on October 29, 2024, with application number 202411514893.1 and titled "Battery cell, battery device and electrical equipment". Technical Field

[0004] This application relates to the field of energy storage technology, and in particular to a battery cell, battery device and electrical equipment. Background Technology

[0005] With the development of new energy sources, more and more fields are adopting new energy as a power source. Due to its advantages such as high energy density, rechargeability, safety, and environmental friendliness, battery devices are widely used in new energy vehicles, consumer electronics, energy storage systems, and other fields.

[0006] In related technologies, a battery device includes multiple battery cells. Each battery cell includes a casing, an insulating component, a pressure relief mechanism, and an electrode assembly. The insulating component and electrode assembly are housed within the casing, and the insulating component insulates the electrode assembly from the casing. When a battery cell in the battery device experiences thermal runaway, the insulating components in adjacent battery cells soften due to heat. When the pressure relief mechanism releases pressure, the electrode assembly moves and impacts the insulating component. Sharp points on the insulating component can cause a short circuit in the electrode assembly, thus leading to premature failure of the battery cell. Summary of the Invention

[0007] In view of the above problems, this application provides a battery cell, a battery device and an electrical device, which solves the problem of premature failure of battery cells caused by the softening of insulating components due to heat.

[0008] The first aspect of this application discloses a battery cell, the battery cell comprising:

[0009] The housing includes multiple sidewalls, one of which is a first sidewall;

[0010] A pressure relief mechanism is provided on the first side wall, and the pressure relief mechanism is configured to open or close according to the internal pressure of the housing;

[0011] Electrode assembly, which is located inside the housing;

[0012] An insulating element is disposed within the housing and between the housing and the electrode assembly for insulating and isolating the housing and the electrode assembly. The side of the insulating element facing the electrode assembly includes a protruding structure that abuts against the electrode assembly.

[0013] The support is located inside the raised structure and supports the electrode assembly through the raised structure. The melting point of the support is greater than that of the insulating component. The support provides support for the electrode assembly when the insulating component is deformed by heat. The support is enclosed inside the raised structure, and the raised structure isolates the support from the outside environment.

[0014] Specifically, the support is located inside the protruding structure of the insulating component. The support supports the electrode assembly through the protruding structure. Since the melting point of the support is greater than that of the insulating component, the support does not soften when the insulating component softens due to heat, thus effectively supporting the electrode assembly. This reduces the displacement of the electrode assembly during the pressure relief process, thereby reducing the possibility of short circuits in the electrode assembly caused by sharp points on the insulating component piercing the electrode assembly due to displacement of the electrode assembly.

[0015] In some embodiments of this application, along the arrangement direction of the electrode assembly and the first sidewall, the support includes a first dimension, the protrusion structure includes a second dimension, and the ratio of the first dimension to the second dimension is in the range of 0.3 to 0.99.

[0016] This configuration ensures that the support has sufficient strength in the direction of the electrode assembly and the first sidewall, providing effective support for the electrode assembly. This reduces the possibility of the electrode assembly shifting during the pressure relief process after the insulation softens due to heat, and also reduces the possibility of short circuits caused by sharp points on the insulation piercing the electrode assembly due to the shifting of the electrode assembly.

[0017] In some embodiments of this application, the ratio of the first dimension to the second dimension is in the range of 0.5 to 0.9.

[0018] This design further enables the support component to provide good support for the electrode assembly while reducing the amount of material it uses, thereby effectively reducing the manufacturing cost of the battery cell.

[0019] In some embodiments of this application, the plurality of sidewalls further includes a second sidewall, which is disposed intersecting with the first sidewall. Among the plurality of sidewalls, the second sidewall is the sidewall with the largest area. Along the arrangement direction of the second sidewall and the electrode assembly, the support includes a third dimension, and the protrusion structure includes a fourth dimension. The ratio of the third dimension to the fourth dimension is in the range of 0.3 to 0.99.

[0020] This configuration ensures that the support has sufficient strength in the direction of the second sidewall and the electrode assembly arrangement, providing effective support for the electrode assembly. This reduces the possibility of the electrode assembly shifting during the pressure relief process after the insulation softens due to heat, and also reduces the possibility of short circuits caused by sharp points on the insulation piercing the electrode assembly due to the shifting of the electrode assembly.

[0021] In some embodiments of this application, the ratio of the third dimension to the fourth dimension is in the range of 0.5 to 0.9.

[0022] This design further enables the support component to provide good support for the electrode assembly while reducing the amount of material it uses, thereby effectively reducing the manufacturing cost of the battery cell.

[0023] In some embodiments of this application, the support member is a hollow structure, which includes at least one second opening. This configuration reduces material usage while ensuring sufficient support strength, thereby effectively lowering manufacturing costs.

[0024] In some embodiments of this application, the hollow structure is filled with a portion of the insulating material. This arrangement allows the interior of the support member to be supported by the portion of the insulating material, reducing the likelihood of the support member collapsing under stress.

[0025] In some embodiments of this application, the wall thickness of the hollow structure is greater than or equal to 0.5 mm and less than or equal to 6 mm.

[0026] This design ensures that the support has sufficient structural strength to provide good support for the electrode assembly.

[0027] In some embodiments of this application, the wall thickness of the hollow structure is greater than or equal to 1 mm and less than or equal to 4 mm.

[0028] This design, while ensuring sufficient structural strength in the support components, reduces the amount of material used in the support components, thereby lowering manufacturing costs.

[0029] In some embodiments of this application, the support member is made of plastic, ceramic, or metal. This design allows the support member to be configured according to different usage requirements, enabling it to adapt to various application scenarios.

[0030] In some embodiments of this application, the number of protruding structures is two, arranged along a predetermined direction on opposite sides of the pressure relief mechanism. This predetermined direction intersects with the arrangement direction of the electrode assembly and the first sidewall. This arrangement reduces the impact of insulation deformation on the protruding structures during the pressure relief process of the battery cell, allowing the protruding structures to effectively support the electrode assembly.

[0031] In some embodiments of this application, the melting point of the support is greater than or equal to 150 degrees Celsius and less than or equal to 600 degrees Celsius.

[0032] This design allows the support components to adapt to the temperature environment of the battery cells during depressurization, reducing softening during the depressurization process and enabling effective support for the electrode assembly through the insulating components.

[0033] In some embodiments of this application, the melting point of the support member is greater than or equal to 200 degrees Celsius and less than or equal to 500 degrees Celsius.

[0034] This design further enables the support components to adapt to the temperature environment of the battery cells during depressurization, reducing the softening that occurs during depressurization, thereby providing effective support for the electrode assembly through the insulating components.

[0035] A second aspect of this application provides a battery device comprising at least one battery cell, the battery cell being the battery cell as described above.

[0036] Specifically, the support for the battery cell is located inside the protruding structure of the insulating component. The support supports the electrode assembly through the protruding structure. Since the melting point of the support is greater than that of the insulating component, the support does not soften when the insulating component softens due to heat, thus effectively supporting the electrode assembly. This reduces the displacement of the electrode assembly during the pressure relief process, thereby reducing the possibility of short circuits in the electrode assembly caused by sharp points on the insulating component piercing the electrode assembly due to displacement of the electrode assembly.

[0037] A third aspect of this application provides an electrical device comprising a battery device as described above.

[0038] In the battery device, the support for the battery cell is located inside the protruding structure of the insulating component. The support supports the electrode assembly through the protruding structure. Since the melting point of the support is greater than that of the insulating component, the support does not soften when the insulating component softens due to heat, thus effectively supporting the electrode assembly. This reduces the displacement of the electrode assembly during the pressure relief process, thereby reducing the possibility of short circuits in the electrode assembly caused by sharp points on the insulating component piercing the electrode assembly due to displacement of the electrode assembly.

[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, the following are specific embodiments of this application. Attached Figure Description

[0040] Figure 1 schematically shows a structural diagram of a vehicle according to one embodiment of this application;

[0041] Figure 2 schematically shows a structural diagram of a battery device according to one embodiment of this application;

[0042] Figure 3 schematically shows a structural diagram of a battery cell according to one embodiment of this application;

[0043] Figure 4 is a schematic diagram of the exploded structure of the battery cell shown in Figure 3;

[0044] Figure 5 is a further exploded structural diagram of the battery cell shown in Figure 4;

[0045] Figure 6 is a structural schematic diagram of the battery cell shown in Figure 3 from another perspective;

[0046] Figure 7 is a cross-sectional view of the battery cell shown in Figure 6 at point AA;

[0047] Figure 8 is an enlarged structural diagram of part C of the structure shown in Figure 7;

[0048] Figure 9 is a cross-sectional view of the battery cell shown in Figure 6 at the BB section;

[0049] Figure 10 schematically shows a structural diagram of a battery cell according to one embodiment of this application;

[0050] Figure 11 is a schematic diagram of the exploded structure of the battery cell shown in Figure 10;

[0051] Figure 12 is a further exploded structural diagram of the battery cell shown in Figure 11;

[0052] Figure 13 is a cross-sectional view of the DD section of the battery cell shown in Figure 10;

[0053] Figure 14 is an enlarged schematic diagram of part F of the structure shown in Figure 13;

[0054] Figure 15 is a cross-sectional view of the EE section of the battery cell shown in Figure 10.

[0055] The reference numerals in the attached figures are as follows: 1000, vehicle; 100, battery device; 200, controller; 300, motor; 110, battery cell assembly; 10, battery cell; 11, casing; 111, end cap; 1111, first sidewall; 112, housing; 1121, second sidewall; 12, pressure relief mechanism; 13, electrode terminal; 14, insulating component; 141, first through hole; 142, second through hole; 143, protruding structure; 144, receiving groove; 145, first mating structure; 1451, insertion protrusion; 15, electrode assembly; 16, current collector; 17, support component; 171, second mating structure; 1711, slot; 120, housing; 1201, first housing; 1202, second housing. X, first direction; Y, second direction; Z, third direction; L1, first dimension; L2, second dimension; L3, third dimension; L4, fourth dimension; L5, fifth dimension. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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).

[0062] 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", "circumferential", etc., 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 do not 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.

[0063] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0064] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied 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 battery device applications, market demand is also constantly increasing.

[0065] In related technologies, a battery device includes multiple battery cells. Each battery cell includes a casing, an insulating component, a pressure relief mechanism, and an electrode assembly. The insulating component and electrode assembly are housed within the casing, and the insulating component insulates the electrode assembly from the casing. When a battery cell in the battery device experiences thermal runaway, the insulating components in adjacent battery cells soften due to heat. When the pressure relief mechanism releases pressure, the electrode assembly moves and impacts the insulating component. Sharp points on the insulating component can cause a short circuit in the electrode assembly, thus leading to premature failure of the battery cell.

[0066] In this application, the battery cell includes a casing, a pressure relief mechanism, an electrode assembly, an insulating component, and a support component. The casing includes multiple sidewalls, including a first sidewall. The pressure relief mechanism is provided on the first sidewall and is configured to open or close according to the internal pressure of the casing. The electrode assembly is disposed inside the casing. The insulating component is disposed inside the casing and between the casing and the electrode assembly, serving to insulate and isolate the casing and the electrode assembly. The side of the insulating component facing the electrode assembly includes a protruding structure that abuts against the electrode assembly. The support component is disposed inside the protruding structure and provides support to the electrode assembly through the protruding structure. The melting point of the support component is higher than that of the insulating component. The support component provides support to the electrode assembly when the insulating component deforms due to heat. The support component is enclosed inside the protruding structure, and the protruding structure isolates the support component from the outside environment. When the insulating component softens due to heat, the support component remains unsoftened, thus effectively supporting the electrode assembly. This reduces the risk of the electrode assembly shifting during the pressure relief process, thereby reducing the possibility of short circuits caused by sharp points on the insulating component piercing the electrode assembly due to the shifting of the electrode assembly.

[0067] The technical solutions described in this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0068] For example, as shown in Figure 1, which is a structural schematic diagram of a vehicle according to one embodiment of this application, the vehicle 1000 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 can have a motor 300, a controller 200, and a battery device 100 installed inside. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000. In another embodiment 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, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0069] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 110 for providing voltage and capacity. The battery cell assembly 110 may include multiple battery cells 10, which are connected in series, parallel, or mixed connection via a busbar.

[0070] In some embodiments, the battery cell assembly 110 is typically formed by arranging a plurality of battery cells 10.

[0071] As an example, the battery cell assembly 110 can be a battery module, which is formed by arranging and fixing multiple battery cells 10 together. As an example, the battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0072] In some embodiments, as shown in FIG2, the battery device 100 may be a battery pack, which includes a housing 120 and one or more battery cell assemblies 110, the battery cell assemblies 110 being housed in the housing 120.

[0073] As an example, the battery cell assembly 110 can be a battery module, and the battery cell assembly 110 can be housed in the housing 120 by fixing the battery module in the housing 120.

[0074] As an example, the battery cell assembly 110 can also be housed in the housing 120 by directly fixing multiple battery cells 10 to the housing 120.

[0075] As an example, the housing 120 may include a first housing 1201 and a second housing 1202. The first housing 1201 and the second housing 1202 are fastened together to form a closed space inside the housing 120 to house the battery cell assembly 110. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 1201 may be a top cover or a bottom plate.

[0076] As an example, the housing 120 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 120 forms an enclosed space to house the battery cell assembly 110.

[0077] In some embodiments, the housing 120 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 120 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 120 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0078] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells 10, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles 1000, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0079] In some embodiments of this application, the battery cell 10 can be a secondary battery, which refers to a battery cell 10 that can be used again after being discharged by recharging to activate the active material.

[0080] The battery cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0081] In some embodiments of this application, as shown in Figures 3 to 15, a battery cell 10 is proposed. The battery cell 10 includes a housing 11, a pressure relief mechanism 12, an electrode assembly 15, an insulating member 14, and a support member 17. The housing 11 includes multiple sidewalls, among which a first sidewall 1111 is provided. The pressure relief mechanism 12 is configured to open or close according to the internal pressure of the housing 11. The electrode assembly 15 is disposed inside the housing 11. The insulating member 14 is disposed inside the housing 11 and between the housing 11 and the electrode assembly 15, for insulating and isolating the housing 11 and the electrode assembly 15. The side of the insulating member 14 facing the electrode assembly 15 includes a protrusion structure 143, which abuts against the electrode assembly 15. The support member 17 is disposed inside the protrusion structure 143 and provides support for the electrode assembly 15 through the protrusion structure 143. The melting point of the support member 17 is greater than that of the insulating member 14. The support member 17 provides support for the electrode assembly 15 when the insulating member 14 is deformed by heat.

[0082] In some embodiments, the outer casing 11 can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing 11), or an aluminum-plastic film, etc. In some embodiments, the outer casing 11 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 11 is a non-sealed structure, the outer casing 11 serves to protect the electrode assembly 15, and a sealing bag is also included between the outer casing 11 and the electrode assembly 15. The sealing bag is used to encapsulate the electrode assembly 15 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component 14 or an aluminum-plastic film. When the outer casing 11 is a sealed structure, it is used to encapsulate the electrode assembly 15 and the electrolyte, etc.

[0083] As an example, the battery cell 10 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. This application does not have any particular limitations.

[0084] The electrode assembly 15 includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell 10, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0085] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0086] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0087] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0088] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co The following are included: 0.25Mn0.25O2 (also known as NCM211), LiNi0.6Co0.2Mn0.2O2 (also known as NCM622), LiNi0.8Co0.1Mn0.1O2 (also known as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.8Co0.15Al0.05O2), and their modified compounds. Modified compounds refer to substances obtained by doping or coating, etc., based on the above-mentioned materials.

[0089] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0090] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0091] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0092] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0093] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0094] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cell 10. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cell 10 may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0095] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0096] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0097] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0098] In some embodiments, the electrode assembly 15 further includes an isolator disposed between the positive and negative electrodes.

[0099] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0100] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0101] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0102] The electrode assembly 15 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0103] In some embodiments, the electrode assembly 15 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0104] In some embodiments, the electrode assembly 15 has a stacked structure.

[0105] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0106] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0107] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0108] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0109] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0110] In some embodiments, the electrode assembly 15 may be cylindrical, flat, or polygonal, etc.

[0111] In some embodiments, the electrode assembly 15 has tabs on its plates that allow current to be drawn out of the electrode assembly 15. The tabs include a positive tab and a negative tab.

[0112] In some embodiments, a pressure relief mechanism 12 is provided on the housing 11. The pressure relief mechanism 12 is used to release the internal gas of the battery cell 10.

[0113] As an example, the internal pressure or temperature of the battery cell 10 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 10 reaches the predetermined threshold, the pressure relief mechanism 12 is activated or a weak structure in the pressure relief mechanism 12 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 10.

[0114] As an example, the pressure relief mechanism 12 can be integrally formed with the housing 11.

[0115] As an example, the pressure relief mechanism 12 can also be separately configured and connected to the housing 11.

[0116] The term "actuation" as used in this application refers to the pressure relief mechanism 12 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 10. The actions of the pressure relief mechanism 12 may include, but are not limited to: movement of components within the pressure relief mechanism 12 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 12, etc. When the pressure relief mechanism 12 is actuated, the high-temperature, high-pressure substances inside the battery cell 10 are discharged outwards from the actuated portion as waste. This method enables the battery cell 10 to release pressure and temperature under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0117] In some embodiments, when the housing 11 is a non-sealed structure, the pressure relief mechanism 12 can be configured as a through hole for discharging gas inside the battery cell 10.

[0118] The emissions from the battery cell 10 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0119] The positive and negative electrodes can be drawn from the same end of the electrode plate, or they can be drawn from opposite ends of the electrode plate.

[0120] The structures of the positive and negative electrode tabs can be the same or different. Taking the positive electrode tab as an example, the positive electrode tab can include multiple positive electrode tab layers, which are stacked together to form the positive electrode tab. The positive electrode tab can include at least two parts: one part is located between the main body of the electrode sheet and the insulating member 14, and the other part is located between the insulating member 14 and the electrode lead-out member.

[0121] The insulating member 14 can insulate at least a portion of the tab from the end face of the main body, thereby reducing the risk of the tab being inserted into the main body when the battery cell 10 is affected by external impacts, vibrations, etc., thereby reducing the risk of short circuit in the battery cell 10 and improving the reliability of the battery cell 10.

[0122] The insulating element 14 can be a one-piece structure or a modular structure. As an example, the insulating element 14 is composed of multiple independently molded parts connected together.

[0123] In this application, the insulating component 14 is disposed between the electrode assembly 15 and the first sidewall 1111 and is a component that insulates the electrode assembly 15 from the first sidewall 1111. The insulating component 14 is a plastic component, which is integrally formed by injection molding. Plastic components are easy to process and have low manufacturing costs.

[0124] It should be understood that the melting point of the insulating component 14, which is made of plastic, is relatively low. When the adjacent battery cell 10 experiences thermal runaway, the high temperature is transferred to the insulating component 14, causing it to soften. The softened insulating component 14 reduces its support performance for the electrode assembly 15. When the pressure relief mechanism 12 is opened, the electrode assembly 15 can move and collide with the sharp points on the insulating component 14. The sharp points on the insulating component 14 can pierce the electrode assembly 15, leading to a short circuit in the electrode assembly 15.

[0125] In this application, the support member 17 is a component with support capabilities. The support member 17 being disposed inside the insulating member 14 means that the support member 17 is disposed in the body of the insulating member 14 by means of embedding or covering. The support member 17 can be completely covered by the insulating member 14, or it can be exposed on the side of the insulating member 14 away from the electrode assembly 15.

[0126] In addition, the melting point of the support member 17 is greater than that of the insulation member 14. When the battery cell 10 is heated, the insulation member 14 softens due to the heat, but the support member 17 does not reach its melting point and will not soften. The structural strength of the support member 17 that has not softened will not change. At this time, the support member 17 can support and limit the electrode assembly 15 through the softened insulation member 14.

[0127] In this application, as shown in Figure 7 or Figure 13, the support member 17 is disposed inside the protrusion structure 143 of the insulating member 14. The support member 17 supports the electrode assembly 15 through the protrusion structure 143. Since the melting point of the support member 17 is greater than that of the insulating member 14, when the insulating member 14 softens due to heat, the support member 17 does not soften, thereby achieving effective support for the electrode assembly 15. This reduces the displacement of the electrode assembly 15 during the pressure relief process of the pressure relief mechanism 12, and further reduces the possibility of short circuit of the electrode assembly 15 caused by sharp positions on the insulating member 14 piercing the electrode assembly 15 due to displacement of the electrode assembly 15.

[0128] It should be understood that the support member 17 is disposed inside the insulating member 14, and the melting point of the support member 17 is set to be greater than that of the insulating member 14, so that the support member 17 can form a "skeleton" structure inside the insulating member 14 to improve the structural strength of the insulating member 14 under heated conditions, so as to improve the support performance of the electrode assembly 15.

[0129] Furthermore, the support member 17 is disposed inside the insulator 14, and the melting point of the support member 17 is set to be greater than that of the insulator 14. Compared to replacing the insulator 14 entirely with the support member 17, this reduces manufacturing costs. At the same time, the insulator 14 can be made of conventional polypropylene (PP), thereby reducing manufacturing costs and ensuring compatibility with the heat-fusion fixation requirements of the insulating film in the battery cell 10.

[0130] Furthermore, the support member 17 is disposed inside the insulating member 14, which is made of a corrosion-resistant material. The insulating member 14 can be used to isolate the support member 17 from the interior of the battery cell 10, thereby reducing the adverse effects of electrolytes and the like on the support member 17 (for example, if the support member 17 is made of a non-corrosion-resistant material, the insulating member 14 can be used to isolate the support member 17 from the interior of the battery cell 10, thereby reducing the corrosion of the support member 17 by electrolytes and the like).

[0131] It should be noted that, as shown in Figure 5 or Figure 12, a first through hole 141 and a second through hole 142 are provided on the insulating component 14. The first through hole 141 is through which the power supply terminal 13 passes and is electrically connected to the electrode assembly 15. The second through hole 142 is arranged opposite to the pressure relief mechanism 12, so that when the battery cell 10 is depressurized, the discharged material can pass through the second through hole 142 and be discharged through the pressure relief mechanism 12.

[0132] In some embodiments of this application, as shown in FIG5 or FIG12, the outer casing 11 includes a housing 112 and an end cap 111. The housing 112 has an opening, and the end cap 111 is connected to the housing 112 and closes the opening. The end cap 111 forms a first sidewall 1111, and a pressure relief mechanism 12 is disposed on the end cap 111.

[0133] The housing 112 may have one or more openings. The end cap 111 may also have one or more. In addition, the connection between the end cap 111 and the housing 112 may include, but is not limited to, snap-fit, adhesive, welding or connection via a connector.

[0134] In this application, the outer casing 11 is configured as two parts: a casing 112 and an end cap 111, and the pressure relief mechanism 12 is disposed on the end cap 111, thereby improving the convenience of processing and assembly and effectively improving production efficiency.

[0135] The battery cell 10 also includes an electrode terminal 13. The electrode terminal 13 can be disposed on the end cover 111 or on the housing 112. When the electrode terminal 13 is disposed on the end cover 111, the electrode terminal 13 is insulated from the end cover 111 and spaced apart from the pressure relief mechanism 12.

[0136] Electrode terminal 13 is electrically connected to the tab of electrode assembly 15. Electrode terminal 13 can be directly connected to the tab, as shown in Figures 5 and 7, or it can be indirectly connected to the tab through current collector 16 (e.g., a conductive metal sheet).

[0137] In this application, using a metal end cap 111 increases the structural strength of the end cap 111 and improves the impact resistance of the battery cell 10. Furthermore, when the end cap 111 is metal and the electrode terminal 13 is mounted on the end cap, an insulating component is provided between the electrode terminal 13 and the end cap 111. This insulating component insulates the electrode terminal 13 from the end cap 111. This insulating component includes, but is not limited to, plastic or ceramic materials.

[0138] By placing the electrode terminal 13 on the end cover 111, the electrode terminal 13 can be installed on the end cover 111 first, and then the end cover 111 can be connected to the housing 112, thereby improving the ease of assembly.

[0139] Insulating the electrode terminal 13 with the end cover 111 reduces the possibility of short circuits between the electrode terminal 13 and the end cover 111, thereby improving the safety performance of the battery cell 10.

[0140] The electrode terminal 13 and the pressure relief mechanism 12 are spaced apart, thereby reducing interference between the electrode terminal 13 and the pressure relief mechanism 12, and thus reducing the occurrence of functional limitations due to structural interference (for example, the pressure relief mechanism 12 cannot be opened due to interference from the electrode terminal 13).

[0141] In some embodiments of this application, as shown in FIG9 or FIG15, along the arrangement direction of the electrode assembly 15 and the first sidewall 1111, the support member 17 includes a first dimension (as shown in FIG9, in FIG9, the arrangement direction of the electrode assembly 15 and the first sidewall 1111 is consistent with the first direction X), and the protrusion structure 143 includes a second dimension, the ratio of the first dimension to the second dimension being in the range of 0.3 to 0.99.

[0142] Specifically, the outer casing 11 includes an end cap 111 and a housing 112. The end cap 111 forms the first sidewall 1111. The electrode assembly 15 and the insulating member 14 are respectively disposed inside the housing 112. The pressure relief mechanism 12 and the electrode terminal 13 are respectively disposed on the end cap 111. The electrode terminal 13 is electrically connected to the electrode assembly 15. The insulating member 14 insulates the end cap 111 from the electrode assembly 15, and the protruding structure 143 of the insulating member 14 abuts against the electrode assembly 15.

[0143] In the arrangement direction of the electrode assembly 15 and the first sidewall 1111, the ratio of the first dimension and the second dimension is set so that the support member 17 has sufficient strength in the arrangement direction of the electrode assembly 15 and the first sidewall 1111, which can provide effective support for the electrode assembly 15. This reduces the possibility of the electrode assembly 15 shifting during the pressure relief process of the pressure relief mechanism 12 after the insulating member 14 softens due to heat. It also reduces the possibility of the electrode assembly 15 short-circuiting due to sharp points on the insulating member 14 piercing the electrode assembly 15 caused by the shifting of the electrode assembly 15.

[0144] Furthermore, in the composite structure formed by the support member 17 and the insulating member 14, the smaller the ratio of the first dimension to the second dimension, the smaller the space occupied by the support member 17 inside the insulating member 14 in the arrangement direction of the electrode assembly 15 and the first sidewall 1111. In this case, the proportion of the support member 17 in the composite structure formed by the support member 17 and the insulating member 14 is smaller, which can reduce the amount of support member 17 used and reduce manufacturing costs. When the ratio of the first dimension to the second dimension is larger, the space occupied by the support member 17 inside the insulating member 14 is larger. In this case, the proportion of the support member 17 in the composite structure formed by the support member 17 and the insulating member 14 is larger, which can improve the support performance of the electrode assembly 15 and reduce the influence of temperature on the support performance.

[0145] It should be noted that the ratio of the first dimension to the second dimension can be 0.3, 0.33, 0.38, 0.42, 0.44, 0.46, 0.49, 0.52, 0.54, 0.56, 0.59, 0.62, 0.64, 0.66, 0.69, 0.72, 0.74, 0.76, 0.79, 0.82, 0.84, 0.86, 0.89, 0.92, 0.94, 0.96, or 0.99.

[0146] In some embodiments of this application, as shown in FIG9 or FIG15, the ratio of the first dimension to the second dimension is in the range of 0.5 to 0.9.

[0147] Specifically, by setting the ratio of the first dimension to the second dimension within the range of 0.5 to 0.9, the support member 17 can provide good support performance for the electrode assembly 15 while reducing the amount of material it uses, thereby effectively reducing the manufacturing cost of the battery cell 10.

[0148] It should be noted that the ratio of the first dimension to the second dimension can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, or 0.9.

[0149] In some embodiments of this application, as shown in FIG9 or 15, a second sidewall 1121 is further included among the plurality of sidewalls. The second sidewall 1121 is intersecting with the first sidewall 1111. Among the plurality of sidewalls, the second sidewall 1121 is the sidewall with the largest area. Along the arrangement direction of the second sidewall 1121 and the electrode assembly 15, the support member 17 includes a third dimension, and the protrusion structure 143 includes a fourth dimension (as shown in FIG9, in FIG9, the arrangement direction of the second sidewall 1121 and the electrode assembly 15 is consistent with the second direction Y). The ratio of the third dimension to the fourth dimension is in the range of 0.3 to 0.99.

[0150] Specifically, the outer casing 11 includes an end cap 111 and a housing 112. The end cap 111 forms a first sidewall 1111, and a second sidewall 1121 is formed on the housing 112. The end cap 111 forming the first sidewall 1111 and the second sidewall 1121 are arranged perpendicularly to each other. The electrode assembly 15 and the insulating member 14 are respectively disposed inside the housing 112. The pressure relief mechanism 12 and the electrode terminal 13 are respectively disposed on the end cap 111. The electrode terminal 13 is electrically connected to the electrode assembly 15. The insulating member 14 insulates the end cap 111 from the electrode assembly 15, and the protruding structure 143 of the insulating member 14 abuts against the electrode assembly 15.

[0151] Among them, the second sidewall 1121 is the sidewall with the largest area among the multiple sidewalls of the outer shell 11. At this time, heat exchange with the battery cell 10 is carried out through the second sidewall 1121, which can improve the heat exchange efficiency of the battery cell 10.

[0152] In this application, two second sidewalls 1121 are provided so that the battery cell 10 can exchange heat through the two second sidewalls 1121, thereby improving the heat exchange efficiency of the battery cell 10.

[0153] In this application, in the arrangement direction of the second sidewall 1121 and the electrode assembly 15, the ratio of the third dimension to the fourth dimension is set in the range of 0.3 to 0.99, so that the support member 17 has sufficient strength in the arrangement direction of the second sidewall 1121 and the electrode assembly 15, and can provide effective support for the electrode assembly 15. This reduces the possibility of the electrode assembly 15 shifting during the pressure relief process of the pressure relief mechanism 12 after the insulating member 14 softens due to heat. It also reduces the possibility of the electrode assembly 15 short-circuiting due to sharp points on the insulating member 14 piercing the electrode assembly 15 caused by the shifting of the electrode assembly 15.

[0154] Furthermore, in the composite structure formed by the support member 17 and the insulating member 14, when the ratio of the third dimension to the fourth dimension is smaller, the space occupied by the support member 17 inside the insulating member 14 is smaller in the arrangement direction of the second sidewall 1121 and the electrode assembly 15. At this time, the proportion of the support member 17 in the composite structure formed by the support member 17 and the insulating member 14 is smaller, which can reduce the amount of support member 17 used and reduce manufacturing costs. When the ratio of the first dimension to the second dimension is larger, the space occupied by the support member 17 inside the insulating member 14 is larger. At this time, the proportion of the support member 17 in the composite structure formed by the support member 17 and the insulating member 14 is larger, which can improve the support performance of the electrode assembly 15 and reduce the influence of temperature on the support performance.

[0155] It should be noted that the ratio of the first dimension to the second dimension can be 0.3, 0.33, 0.38, 0.42, 0.44, 0.46, 0.49, 0.52, 0.54, 0.56, 0.59, 0.62, 0.64, 0.66, 0.69, 0.72, 0.74, 0.76, 0.79, 0.82, 0.84, 0.86, 0.89, 0.92, 0.94, 0.96, or 0.99.

[0156] In some embodiments of this application, as shown in FIG9 or FIG15, the ratio of the third dimension to the fourth dimension is in the range of 0.5 to 0.9.

[0157] Specifically, by setting the ratio of the third dimension to the fourth dimension in the range of 0.5 to 0.9, the support member 17 can provide good support performance for the electrode assembly 15 while reducing the amount of material used, thereby effectively reducing the manufacturing cost of the battery cell 10.

[0158] It should be noted that the ratio of the third dimension to the fourth dimension can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, or 0.9.

[0159] In some embodiments of this application, the insulating member 14 further includes a receiving groove 144 having a first opening, the receiving groove 144 being disposed corresponding to the protrusion structure 143, and the first opening being disposed away from the electrode assembly 15, and the support member 17 being fixed in the receiving groove 144 through the first opening.

[0160] Specifically, the receiving groove 144 is formed at the position where the insulating member 14 has the protruding structure 143, and part of the structure of the receiving groove 144 is formed inside the protruding structure 143. The first opening of the receiving groove 144 is formed on the surface of the insulating member 14 away from the electrode assembly 15, that is, the first opening is set away from the electrode assembly 15. The support member 17 is received and disposed in the receiving groove 144. The receiving groove 144 is used to receive the support member 17, so that the support member 17 is insulated from the electrode assembly 15. The support member 17 supports the electrode assembly 15 through the protruding structure 143 of the insulating member 14.

[0161] When assembling the support member 17 and the insulating member 14, the support member 17 is inserted into the receiving groove 144 through the first opening of the receiving groove 144. This arrangement facilitates the assembly between the support member 17 and the insulating member 14, thereby improving assembly efficiency and accelerating the production cycle.

[0162] It should be noted that the shape of the receiving groove 144 is adapted to the shape of the support member 17. The inner wall of the receiving groove 144 limits the support member 17 in multiple dimensions, reducing the movement of the support member 17 relative to the receiving groove 144, thereby improving the support performance of the support member 17.

[0163] In other embodiments of this application, the first opening of the receiving groove 144 may also be provided on other surfaces of the insulating member 14 (excluding the surface of the insulating member 14 facing the electrode assembly 15).

[0164] Furthermore, the insulating member 14 is connected and fixed to the end cap 111, which forms the first sidewall 1111. The connection and fixing methods include, but are not limited to, heat fusion, snap-fit, adhesive bonding, or via a connector. Meanwhile, the support member 17 may or may not be connected to the end cap 111, which forms the first sidewall 1111. When the support member 17 is connected to the end cap 111, which forms the first sidewall 1111, the connection methods include, but are not limited to, heat fusion, snap-fit, adhesive bonding, or via a connector.

[0165] In some embodiments of this application, as shown in Figures 5 and 8, the support member 17 is a solid component. Specifically, making the support member 17 a solid component can improve its support performance, thereby providing good support for the electrode assembly 15.

[0166] It should be noted that the shape of the support member 17 includes, but is not limited to, block, strip, or column.

[0167] In addition, the support member 17 is fixed in the receiving groove 144, and the fixing method includes, but is not limited to, bonding, welding, snap-fitting or connecting via a connector.

[0168] In some embodiments of this application, as shown in Figures 5 and 9, the receiving groove 144 includes a first mating structure 145, and the support member 17 includes a second mating structure 171. The first mating structure 145 and the second mating structure 171 are mated to fix the support member 17 in the receiving groove 144.

[0169] Specifically, after the support member 17 is inserted into the receiving groove 144 through the first opening, the support member 17 is fixed in the receiving groove 144. The support member 17 is fixed in the receiving groove 144 by the cooperation of the first mating structure 145 and the second mating structure 171. This arrangement facilitates the fixing of the support member 17 in the receiving groove 144 without requiring other fixing processes, thereby reducing the number of steps in the assembly process and accelerating the production cycle.

[0170] It should be noted that the first mating structure 145 and the second mating structure 171 can be implemented in various ways. For example, the first mating structure 145 is a first snap-fit ​​and the second mating structure 171 is a second snap-fit. The first snap-fit ​​and the second snap-fit ​​cooperate to fix the support member 17 in the receiving groove 144. Another example is that the first mating structure 145 and the second mating structure 171 are mated by a concave-convex snap-fit ​​method.

[0171] In some embodiments of this application, as shown in Figures 5 and 9, the first mating structure 145 and the second mating structure 171 are in a concave-convex fit.

[0172] Specifically, the first mating structure 145 and the second mating structure 171 are fitted together with a concave-convex fit. The concave-convex fit facilitates assembly and increases the contact area, thereby improving the fixing strength of the support member 17 and enhancing the stability of the support member 17. This, in turn, provides stable and effective support for the electrode assembly 15.

[0173] It should be understood that when the first mating structure 145 and the second mating structure 171 are in a concave-convex fit, there is a certain amount of interference at the mating position, so as to fix the support member 17 and the insulating member 14 by setting the interference.

[0174] In addition, one of the first mating structure 145 and the second mating structure 171 is a protruding structure, and the other of the first mating structure 145 and the second mating structure 171 is a recessed structure.

[0175] In some embodiments of this application, as shown in Figures 5 and 9, the first mating structure 145 is an insertion protrusion 1451 formed in the receiving groove 144, and the second mating structure 171 is a slot 1711 formed on the support member 17, wherein the insertion protrusion 1451 is inserted and fixed to the slot 1711.

[0176] Specifically, the first mating structure 145 is configured as an insertion protrusion 1451 formed in the receiving groove 144, and the second mating structure 171 is configured as a slot 1711 formed on the support member 17. This configuration is simple, easy to process and manufacture, and can effectively reduce manufacturing costs.

[0177] It should be noted that the shape of the insertion protrusion 1451 includes, but is not limited to, stiffeners or protruding columns.

[0178] In some embodiments of this application, as shown in Figures 5 and 9, the insertion protrusion 1451 is a rib structure, and the slot 1711 is adapted to the rib structure.

[0179] Specifically, the insertion protrusion 1451 is designed as a rib structure, which not only enables it to be inserted into the slot 1711, but also strengthens the structure of the receiving groove 144.

[0180] It should be noted that the receiving groove 144 includes multiple inner wall surfaces, and the stiffening plate can be connected to one inner wall surface of the receiving groove 144 or multiple inner wall surfaces of the receiving groove 144.

[0181] In some embodiments of this application, as shown in FIG5, there are multiple insertion protrusions 1451, which are spaced apart in the receiving groove 144, and there are multiple slots 1711, with each insertion protrusion 1451 corresponding to one slot 1711.

[0182] Specifically, by providing multiple insertion protrusions 1451 and slots 1711 that match the number of insertion protrusions 1451, the fixing strength of the support member 17 can be improved, thereby enhancing the stability of the support member 17 after installation.

[0183] It should be noted that the multiple insertion protrusions 1451 are spaced apart within the receiving groove 144, and the spacing can be equal or unequal. For example, the insertion protrusions 1451 are ribbed structures, and multiple ribbed structures are arranged parallel to each other within the receiving groove 144. Multiple slots 1711 are formed on the support member 17, making the support member 17 have a comb-like structure. When the support member 17 is placed within the receiving groove 144, the support member 17 does not protrude from the first opening of the receiving groove 144.

[0184] In some embodiments of this application, as shown in Figures 11 to 15, the support member 17 is enclosed inside the protruding structure 143.

[0185] Specifically, the support member 17 is configured to be enclosed inside the protruding structure 143. This configuration isolates the support member 17 from the outside world and reduces the adverse effects of electrolyte and other substances inside the battery cell 10 on the support member 17.

[0186] It should be understood that the fact that the protruding structure 143 covers the support member 17 means that the support member 17 is located inside the protruding structure 143, and the protruding structure 143 isolates the support member 17 from the outside.

[0187] It should be noted that when the support member 17 is placed inside the protrusion structure 143, the support member 17 is first placed in the mold, and then the molten insulating material is injected into the mold to form the insulating member 14. After passing through the coolant, the support member 17 is covered by the protrusion structure 143 of the insulating member 14 (for example, the insulating member 14 is polypropylene, and the support member 17 is placed inside the protrusion structure 143 of the insulating member 14 by injection molding).

[0188] In addition, the insulating member 14 is connected and fixed to the end cap 111, which is the first sidewall 1111. The connection and fixing methods include, but are not limited to, heat fusion, snap-fit, bonding or connecting member.

[0189] In some embodiments of this application, as shown in FIG11, the support member 17 is a hollow structure, and the hollow structure includes at least one second opening.

[0190] Specifically, the support member 17 is configured as a hollow structure, and the hollow structure includes at least one second opening. While ensuring that the support member 17 has sufficient support strength, the amount of material used is reduced, thereby effectively reducing manufacturing costs.

[0191] It should be noted that the number of second openings in a hollow structure can be one, two, three, four, or five, etc.

[0192] In this application, the support member 17 has a cylindrical structure and a hollow structure including two second openings. The two second openings are arranged opposite to each other. The cross-section of the cylindrical support member 17 can be circular or rectangular.

[0193] In some embodiments of this application, as shown in FIG15, the interior of the hollow structure is filled with a portion of the body of the insulating element 14.

[0194] Specifically, the support member 17 is configured as a hollow structure, and a portion of the body of the insulating member 14 is filled inside the hollow structure, so that the interior of the support member 17 can be supported by the portion of the body of the insulating member 14, thereby reducing the possibility of the support member 17 collapsing under stress.

[0195] In some embodiments of this application, as shown in FIG15, L5 represents the wall thickness of the hollow structure, wherein the wall thickness of the hollow structure is greater than or equal to 0.5 mm and less than or equal to 6 mm.

[0196] Specifically, the wall thickness of the hollow structure is set to be greater than or equal to 0.5 mm and less than or equal to 6 mm, so that the support member 17 has sufficient structural strength to provide good support for the electrode assembly 15.

[0197] It should be noted that L5 can be 0.5 mm, 0.9 mm, 1.4 mm, 1.9 mm, 2.4 mm, 2.9 mm, 3.4 mm, 3.9 mm, 4.4 mm, 4.9 mm, 5.4 mm, or 6 mm.

[0198] In some embodiments of this application, as shown in FIG15, the wall thickness of the hollow structure is greater than or equal to 1 mm and less than or equal to 4 mm.

[0199] Specifically, by setting the wall thickness of the hollow structure to be greater than or equal to 1 mm and less than or equal to 4 mm, the material usage of the support member 17 can be reduced while ensuring that the support member 17 has sufficient structural strength, thereby reducing the manufacturing cost.

[0200] It should be noted that, as shown in Figure 15, L5 represents the wall thickness of the hollow structure, and L5 can be 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, or 4 mm.

[0201] In some embodiments of this application, the support member 17 is a plastic part, a ceramic part, or a metal part.

[0202] Specifically, the support component 17 can be made of plastic, ceramic or metal. This allows the support component 17 to be configured according to different usage requirements, enabling it to adapt to different usage scenarios.

[0203] It should be understood that when the support component 17 is a plastic part, this plastic part is a high-temperature resistant plastic part, such as PET / PI / PFA / PPS / PA / PPA / PC-ABS, etc., where:

[0204] PET refers to polyethylene terephthalate, commonly known as polyester resin. It is the most important type of thermoplastic polyester with a melting point of ≥250℃.

[0205] PFA refers to polyfluoroalkoxy, a copolymer of tetrafluoroethylene and perfluoroalkoxy vinyl ethers, with a melting point ≥300℃.

[0206] PI stands for Polyimide, a high-performance organic polymer with a melting point ≥300℃.

[0207] PPS stands for polyphenylene sulfide, a new type of high-performance thermoplastic resin with a melting point ≥285℃.

[0208] PA stands for polyamide, commonly known as nylon, with a melting point ≥260℃.

[0209] PPA stands for Polyphthalamide, commonly known as high-temperature resistant nylon, with a melting point ≥300℃.

[0210] PC-ABS refers to acrylonitrile-butadiene-styrene copolymer, which is called plastic alloy in the chemical industry. It is named PC+ABS because this material has both the excellent heat resistance, weather resistance, dimensional stability and impact resistance of PC resin (polycarbonate) and the excellent processing fluidity of ABS resin. Its melting point is ≥240℃.

[0211] In some embodiments of this application, there are two protrusions 143. Along a preset direction (as shown in Figure 4, the preset direction is consistent with the third direction Z), the two protrusions 143 are spaced apart on opposite sides of the pressure relief mechanism 12. The preset direction intersects with the arrangement direction of the electrode assembly 15 and the first sidewall 1111.

[0212] Specifically, in this application, the pressure relief mechanism 12 is located at or near the middle of the first side wall 1111. When the pressure relief mechanism 12 relieves pressure on the battery cell 10, the internal material of the battery cell 10 is ejected through the pressure relief mechanism 12. During the ejection process, the insulating member 14 will deform, and the deformation at both ends of the preset direction is smaller. Thus, along the preset direction, the two protruding structures 143 are spaced apart on opposite sides of the pressure relief mechanism 12, which can reduce the impact of the deformation of the insulating member 14 on the protruding structure 143, so that the protruding structure can effectively support the electrode assembly.

[0213] It should be noted that, along the preset direction, the protruding structure 143 and the end of the insulating member can be set flush or spaced apart.

[0214] In some embodiments of this application, the melting point of the support is greater than or equal to 150 degrees Celsius and less than or equal to 600 degrees Celsius.

[0215] Specifically, setting the melting point of the support component within the range of 150 degrees Celsius to 600 degrees Celsius allows the support component to adapt to the temperature environment of the battery cell during depressurization, reducing softening during the depressurization process, thereby enabling effective support of the electrode assembly through the insulating component.

[0216] It should be noted that the specific melting points of the support components can be 150 degrees Celsius, 180 degrees Celsius, 210 degrees Celsius, 260 degrees Celsius, 290 degrees Celsius, 310 degrees Celsius, 360 degrees Celsius, 390 degrees Celsius, 410 degrees Celsius, 460 degrees Celsius, 490 degrees Celsius, 510 degrees Celsius, 560 degrees Celsius, and 600 degrees Celsius.

[0217] In some embodiments of this application, the temperature of the support member is greater than or equal to 200 degrees Celsius and less than or equal to 500 degrees Celsius.

[0218] Specifically, the melting point of the support is further set in the range of 200 degrees Celsius to 500 degrees Celsius, so that the support can adapt to the temperature environment of the battery cell during depressurization, reduce the softening during depressurization, and thus form effective support for the electrode assembly through the insulating component.

[0219] It should be noted that the melting point of the support component can be 200 degrees Celsius, 250 degrees Celsius, 300 degrees Celsius, 350 degrees Celsius, 400 degrees Celsius, 450 degrees Celsius, or 500 degrees Celsius.

[0220] As shown in Figures 2 to 15, a second aspect of this application provides a battery device 100, which includes at least one battery cell 10, wherein the battery cell 10 is a battery cell 10 as described above.

[0221] Specifically, the support member 17 of the battery cell 10 is located inside the protrusion structure 143 of the insulating member 14. The support member 17 supports the electrode assembly 15 through the protrusion structure 143. Since the melting point of the support member 17 is greater than that of the insulating member 14, when the insulating member 14 softens due to heat, the support member 17 does not soften, so as to effectively support the electrode assembly 15. This reduces the displacement of the electrode assembly 15 during the pressure relief process of the pressure relief mechanism 12, and further reduces the possibility of short circuit of the electrode assembly 15 caused by the sharp position on the insulating member 14 piercing the electrode assembly 15 due to the displacement of the electrode assembly 15.

[0222] As shown in Figures 1 to 15, a third aspect of this application proposes an electrical device, which includes a battery device 100 as described above.

[0223] In the battery device 100, the support member 17 of the battery cell 10 is located inside the protrusion structure 143 of the insulating member 14. The support member 17 supports the electrode assembly 15 through the protrusion structure 143. Since the melting point of the support member 17 is greater than that of the insulating member 14, when the insulating member 14 is heated and softened, the support member 17 can remain unsoftened, thereby effectively supporting the electrode assembly 15. This reduces the displacement of the electrode assembly 15 during the pressure relief process of the pressure relief mechanism 12, and further reduces the possibility of short circuit of the electrode assembly 15 caused by sharp positions on the insulating member 14 piercing the electrode assembly 15 due to displacement of the electrode assembly 15.

[0224] 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.

[0225] In the embodiments of this application, as shown in Figures 3 to 15, this application proposes a battery cell 10, a housing 11, a pressure relief mechanism 12, an electrode assembly 15, an insulating member 14, and a support member 17. The housing 11 includes multiple sidewalls, among which a first sidewall 1111 is provided. The pressure relief mechanism 12 is provided on the first sidewall 1111 and is configured to open or close according to the internal pressure of the housing 11. The electrode assembly 15 is disposed inside the housing 11. The insulating member 14 is disposed inside the housing 11 and is insulatingly disposed between the housing 11 and the electrode assembly 15, for insulating and isolating the housing 11 and the electrode assembly 15. The side of the insulating member 14 facing the electrode assembly 15 includes a protrusion structure 143, which abuts against the electrode assembly 15. The support member 17 is disposed inside the protrusion structure 143 and provides support for the electrode assembly 15 through the protrusion structure 143. The melting point of the support member 17 is greater than that of the insulating member 14. The support member 17 provides support for the electrode assembly 15 when the insulating member 14 is deformed by heat.

[0226] Furthermore, along the arrangement direction of the electrode assembly 15 and the first sidewall 1111, the support member 17 includes a first dimension, the protrusion structure 143 includes a second dimension, and the ratio of the first dimension to the second dimension is in the range of 0.5 to 0.9.

[0227] Furthermore, the plurality of sidewalls also includes a second sidewall 1121, which intersects with the first sidewall 1111. Among the plurality of sidewalls, the second sidewall 1121 is the sidewall with the largest area. Along the arrangement direction of the second sidewall 1121 and the electrode assembly 15, the support member 17 includes a third dimension, and the protrusion structure 143 includes a fourth dimension. The ratio of the third dimension to the fourth dimension is in the range of 0.5 to 0.9.

[0228] In some examples of this embodiment, the insulating member 14 further includes a receiving groove 144 with a first opening, the receiving groove 144 being correspondingly disposed to the protruding structure 143, and the first opening being disposed away from the electrode assembly 15. The support member 17 is fixed in the receiving groove 144 through the first opening. The support member 17 is a solid component. A plurality of rib structures are provided in the receiving groove 144, and a plurality of slots 1711 are provided on the support member 17. The number of slots 1711 corresponds one-to-one with the number of rib structures, and the plurality of rib structures are respectively inserted into the plurality of slots 1711.

[0229] In some examples of this embodiment, the support member 17 is enclosed within the protruding structure 143. The support member 17 is a hollow structure, comprising two opposing second openings. The interior of the hollow structure is filled with a portion of the body of the insulating member 14. The wall thickness of the hollow structure is greater than or equal to 1 mm and less than or equal to 4 mm.

[0230] Furthermore, the support 17 is a plastic part, which is a high-temperature resistant plastic part.

[0231] Furthermore, there are two protrusions 143. Along a preset direction, the two protrusions 143 are spaced apart on opposite sides of the pressure relief mechanism 12. The preset direction intersects with the arrangement direction of the electrode assembly 15 and the first sidewall 1111.

[0232] Furthermore, the temperature of the support component is greater than or equal to 200 degrees Celsius and less than or equal to 500 degrees Celsius.

[0233] It should be noted that the melting point of the support component can be 200 degrees Celsius, 250 degrees Celsius, 300 degrees Celsius, 350 degrees Celsius, 400 degrees Celsius, 450 degrees Celsius, or 500 degrees Celsius.

[0234] In this application, the support member 17 is disposed inside the protrusion structure 143 of the insulating member 14. The support member 17 supports the electrode assembly 15 through the protrusion structure 143. Since the melting point of the support member 17 is greater than that of the insulating member 14, when the insulating member 14 softens due to heat, the support member 17 does not soften, thereby achieving effective support for the electrode assembly 15. This reduces the displacement of the electrode assembly 15 during the pressure relief process of the pressure relief mechanism 12, and further reduces the possibility of short circuit of the electrode assembly 15 caused by sharp positions on the insulating member 14 piercing the electrode assembly 15 due to displacement of the electrode assembly 15.

[0235] 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, wherein, The battery cell includes: An outer casing, the outer casing including a plurality of sidewalls, the plurality of sidewalls including a first sidewall; A pressure relief mechanism is provided on the first sidewall, and the pressure relief mechanism is configured to open or close according to the internal pressure of the housing; An electrode assembly disposed inside the housing; An insulating member is disposed within the housing and between the housing and the electrode assembly for insulating and isolating the housing and the electrode assembly. The side of the insulating member facing the electrode assembly includes a protruding structure that abuts against the electrode assembly. A support member is disposed inside the protruding structure and supports the electrode assembly through the protruding structure. The melting point of the support member is greater than that of the insulating member. The support member provides support for the electrode assembly when the insulating member is deformed by heat. The support member is enclosed inside the protruding structure, and the protruding structure isolates the support member from the outside environment.

2. The battery cell as described in claim 1, wherein, Along the arrangement direction of the electrode assembly and the first sidewall, the support includes a first dimension, the protrusion structure includes a second dimension, and the ratio of the first dimension to the second dimension is in the range of 0.3 to 0.

99.

3. The battery cell as described in claim 2, wherein, The ratio of the first dimension to the second dimension is in the range of 0.5 to 0.

9.

4. The battery cell according to any one of claims 1 to 3, wherein, The plurality of sidewalls also includes a second sidewall, which intersects with the first sidewall. Among the plurality of sidewalls, the second sidewall has the largest area. Along the arrangement direction of the second sidewall and the electrode assembly, the support includes a third dimension, and the protrusion structure includes a fourth dimension. The ratio of the third dimension to the fourth dimension is in the range of 0.3 to 0.

99.

5. The battery cell as described in claim 4, wherein, The ratio of the third dimension to the fourth dimension is in the range of 0.5 to 0.

9.

6. The battery cell according to any one of claims 1 to 5, wherein, The support member is a hollow structure, and the hollow structure includes at least one second opening.

7. The battery cell as described in claim 6, wherein, The hollow structure is filled with part of the insulating component.

8. The battery cell as described in claim 6 or 7, wherein, The wall thickness of the hollow structure is greater than or equal to 0.5 mm and less than or equal to 6 mm.

9. The battery cell as described in claim 8, wherein, The wall thickness of the hollow structure is greater than or equal to 1 mm and less than or equal to 4 mm.

10. The battery cell according to any one of claims 1 to 9, wherein, The support component can be made of plastic, ceramic, or metal.

11. The battery cell according to any one of claims 1 to 10, wherein, The number of protruding structures is two, and the two protruding structures are arranged on opposite sides of the pressure relief mechanism along a preset direction, which intersects with the arrangement direction of the electrode assembly and the first sidewall.

12. The battery cell according to any one of claims 1 to 11, wherein, The melting point of the support component is greater than or equal to 150 degrees Celsius and less than or equal to 600 degrees Celsius.

13. The battery cell as described in claim 12, wherein, The melting point of the support component is greater than or equal to 200 degrees Celsius and less than or equal to 500 degrees Celsius.

14. A battery device, wherein, The battery device includes at least one battery cell, which is a battery cell according to any one of claims 1 to 13.

15. An electrical appliance, wherein, The electrical equipment includes the battery device according to claim 14.

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