Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. Each battery cell comprises a shell; the electrode assembly is arranged in the shell, and the electrode assembly comprises at least two pole pieces; and the supporting piece is arranged in the shell, one end of the supporting piece is arranged between the two adjacent pole pieces, and the other end of the supporting piece extends out of the electrode assembly.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] During battery production and use, the electrodes and casing are prone to mutual compression and damage, resulting in insufficient stability of the battery cells. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the problem of mutual compression and damage between the electrode and the casing, and improve the stability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a housing; an electrode assembly disposed within the housing, the electrode assembly including at least two electrodes; and a support member disposed within the housing, one end of the support member being disposed between two adjacent electrodes, and the other end of the support member extending out of the electrode assembly.

[0006] In the embodiments of this application, the battery cell includes a housing, an electrode assembly, and a support member. The electrode assembly and the support member are disposed within the housing. The electrode assembly includes at least two electrode plates. The support member is connected to the electrode assembly. One end of the support member is disposed between two adjacent electrode plates to ensure that the portions of the electrode assembly located on both sides of the support member are subjected to uniform force. The support member and the electrode assembly are stably connected. The other end of the support member extends out of the electrode assembly so that after the electrode assembly and the support member are disposed within the housing, the support member creates a gap between the electrode assembly and the housing to improve the problem of extrusion damage to the electrode assembly and the housing, thereby enhancing the stability of the battery cell.

[0007] In some embodiments, the electrode assembly includes at least two stacked electrodes, the electrode assembly includes a tab extending in a first direction, and a support extending in a second direction from the electrode assembly, the first direction and the second direction intersecting.

[0008] In the embodiment of this application, the tab extends out of the electrode assembly along a first direction, and the support extends out of the electrode assembly along a second direction, so that after the electrode assembly and the support are disposed in the housing, the support causes the electrode assembly and the housing to be spaced apart along the second direction, thereby improving the problem of the electrode assembly and the housing being damaged by compression in the second direction and improving the stability of the battery cell.

[0009] In some embodiments, the electrode assembly further includes a spacer, which includes a main body and a bent portion. A plurality of main bodies are spaced apart, and each electrode and each support are disposed between two adjacent main bodies. The bent portion is connected to the same end of the adjacent main bodies in a second direction, and one end of the support is connected to the bent portion along the second direction.

[0010] In the embodiment of this application, the separator includes a main body and a bent portion. Multiple main bodies are spaced apart, and each electrode and each support are disposed between two adjacent main bodies. The bent portion is connected to the same end of the adjacent main bodies in the second direction. The separator is used to maintain the insulation effect between adjacent electrodes and between the electrodes and the support. The support and the bent portion abut each other, eliminating the need for additional connecting parts. This helps to reduce the difficulty of fitting the support and the electrode assembly, reduce the weight of the battery cell, and increase the energy density of the battery cell.

[0011] In some embodiments, the electrode has a dimension of L1 in the second direction and the support has a dimension of L2 in the second direction, satisfying that L2 > L1.

[0012] In the embodiment of this application, when the electrode sheet has a dimension of L1 in the second direction and the support member has a dimension of L2 in the second direction, the support member can extend out of the electrode assembly in the second direction. This allows the support member to create a gap between the electrode assembly and the housing after the electrode assembly and the support member are installed in the housing, thereby improving the problem of the electrode assembly and the housing being damaged by compression and enhancing the stability of the battery cell.

[0013] In some embodiments, the support member has a transition fillet at the end that contacts the bend in the second direction.

[0014] In the embodiment of this application, the end of the support member that contacts the bent portion in the second direction is provided with a transition fillet, so as to reduce the risk of the support member damaging the bent portion when the support member and the bent portion are in contact.

[0015] In some embodiments, the electrode assembly further includes a spacer, which includes a main body and a bent portion. A plurality of main bodies are spaced apart, and each electrode and each support are disposed between adjacent main bodies. The bent portion is connected to the same end of adjacent main bodies in a second direction, and the support is bonded to at least one adjacent main body.

[0016] In the embodiments of this application, the support member and at least one adjacent main body part are bonded together to improve the connection reliability of the support member and the electrode assembly.

[0017] In some embodiments, the thermal conductivity of the support is greater than that of the insulating member.

[0018] In the embodiments of this application, the thermal conductivity of the support is greater than that of the separator. The support can assist the electrode assembly in heat dissipation, thereby enhancing the heat dissipation efficiency of the electrode assembly and improving the performance of the battery cell.

[0019] In some embodiments, the electrode assembly includes at least two electrode groups spaced apart, each electrode group including a positive electrode and a negative electrode stacked together, a support member located between two adjacent electrode groups, and a negative electrode being disposed at one end of the electrode group facing the support member.

[0020] In the embodiments of this application, the electrode assembly includes at least two electrode groups spaced apart. Each electrode group includes a positive electrode and a negative electrode stacked together. A support member is located between two adjacent electrode groups. A negative electrode is disposed at one end of the electrode group facing the support member, that is, the support member is located between two negative electrodes. This is to improve the problem that when the support member is directly opposite the positive electrode, since the support member has no lithium intercalation capability, lithium ions cannot be intercalated into the support member after the positive electrode is delithilated during the discharge of a single battery cell, resulting in lithium plating on the adjacent negative electrode due to excessive lithium intercalation.

[0021] In some embodiments, the electrode assembly includes at least two electrode groups spaced apart, each electrode group including a positive electrode and a negative electrode stacked together, a support member located between two adjacent electrode groups, each electrode including a current collector and an active material layer disposed in the current collector, the positive electrode including a first electrode disposed at one end of the electrode group facing the support member, the first electrode being disposed on the side of its current collector facing away from the support member.

[0022] In the embodiment of this application, the first electrode is disposed at one end of the electrode group facing the support, the support is disposed between the two first electrodes, and the active material layer of the first electrode is disposed on the side of its current collector facing away from the support. Since the active material layer is not disposed on the side of the first electrode facing the support, the side of the first electrode facing the support will not exert its capacity. This can improve the problem of lithium plating on the electrode caused by the imbalance of capacity between the positive and negative electrodes in the electrode assembly.

[0023] In some embodiments, the electrode assembly includes at least two electrode groups spaced apart, each electrode group including a positive electrode and a negative electrode stacked together, a support member located between two adjacent electrode groups, a positive electrode being disposed at one end of the electrode group facing the support member, and the electrode assembly further includes a barrier layer disposed on the side of the two positive electrodes adjacent to the support member facing the support member, the barrier layer being used to block at least a portion of ions from passing through.

[0024] In the embodiment of this application, the electrode assembly further includes a barrier layer. The barrier layer is disposed on the side of the two positive electrode sheets adjacent to the support member facing the support member. The barrier layer is used to block at least some lithium ions from passing through. At this time, the side of the positive electrode sheet facing the support member does not exert its capacity. This can improve the problem of lithium plating on the electrode sheet caused by the imbalance of capacity between the positive and negative electrode sheets in the electrode assembly.

[0025] In some embodiments, the electrode assembly further includes an isolator disposed between the support and the electrode assembly to insulate the support and the electrode assembly from each other.

[0026] In the embodiments of this application, the separator is disposed between the support and the electrode group to insulate the support and the electrode group from each other, thereby reducing the risk of short circuit within the battery cell due to the connection between the support and the electrode group.

[0027] In some embodiments, n supports and electrode assemblies are connected, satisfying 1≤n≤10.

[0028] In the embodiments of this application, when the number of support members meets the above conditions, the support members can not only play the role of supporting the electrode assembly, but also improve the problem that too many support members will occupy too much internal space of the housing, resulting in low energy density of the battery cell.

[0029] Secondly, embodiments of this application provide a battery device including the battery cell described in the first aspect embodiment above.

[0030] Thirdly, embodiments of this application provide an electrical device, including the battery device described in the second aspect of the embodiment above. Attached Figure Description

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0032] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of the application;

[0035] Figure 4 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application;

[0036] Figure 5 This is a partial structural schematic diagram of a battery cell provided in an embodiment of this application;

[0037] Figure 6 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application;

[0038] Figure 7 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application;

[0039] Figure 8 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application;

[0040] Figure 9 This is a schematic diagram of the structure of the first electrode of a battery cell provided in an embodiment of this application;

[0041] Figure 10 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application;

[0042] Figure 11 This is a partial structural schematic diagram of a battery cell provided in one embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Vehicle; 101. Motor; 102. Controller;

[0045] 2. Battery assembly; 201. Battery module; 202. Housing; 2021. First housing; 2022. Second housing; 3. Individual battery cell; 4. Casing;

[0046] 5. Electrode assembly; 51. Tab; 52. Electrode; 53. Isolator; 531. Main body; 532. Bending part; 54. Electrode group; 521. Positive electrode; 522. Negative electrode; 5211. First electrode; 5212. Second electrode; 551. Current collector; 552. Active material layer; 553. Barrier layer; 6. Top cover assembly; 7. Support component;

[0047] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0048] 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.

[0049] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0050] 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.

[0051] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0052] 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.

[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0055] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0056] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a housing for encapsulating one or more battery cells. The housing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0057] During battery production and use, the electrodes and casing are prone to mutual compression and damage.

[0058] For horizontally placed stacked cell structures, after the electrode assembly is placed into the housing, the gap between the electrode assembly and the alignment between the electrodes can cause the electrode assembly to be skewed and abnormal. Some electrodes may protrude from the bottom bearing surface, causing the electrodes and the housing to be squeezed and damaged.

[0059] To address the aforementioned issues, this application provides a battery cell comprising a housing, an electrode assembly, and a support member. The electrode assembly and the support member are disposed within the housing. The electrode assembly includes at least two electrode plates. The support member is connected to the electrode assembly, with one end positioned between two adjacent electrode plates to ensure uniform force distribution on the portions of the electrode assembly located on both sides of the support member. The support member and the electrode assembly are stably connected. The other end of the support member extends beyond the electrode assembly, creating a gap between the electrode assembly and the housing after the electrode assembly and the support member are disposed within the housing. This mitigates the problem of pressure damage to the electrode assembly and the housing, thereby enhancing the stability of the battery cell.

[0060] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0061] A single battery cell includes an electrode assembly and an electrolyte disposed within a casing. The electrodes include a positive electrode and a negative electrode, and the electrode assembly also includes a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0062] Specifically, the positive electrode includes a positive current collector and a positive active material layer, the positive active material layer being coated on the surface of the positive current collector; the positive current collector includes a positive current collection section and a positive electrode tab connected to the positive current collection section, the positive current collection section being coated with the positive active material layer, and the positive electrode tab not being coated with the positive active material layer. Taking a lithium-ion battery as an example, the positive current collector can be aluminum or a composite material containing an aluminum coating, and the positive active material layer includes the positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer, the negative active material layer being coated on the surface of the negative current collector; the negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section, the negative current collection section being coated with the negative active material layer, and the negative electrode tab not being coated with the negative active material layer. The negative current collector can be copper or a composite material containing a copper coating, and the negative active material layer includes the negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0063] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0064] 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.

[0065] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this either.

[0066] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or a battery pack. A battery pack generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0067] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0068] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a vehicle structure provided in one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 2 is installed inside vehicle 1, and the battery device 2 can be located at the bottom, front, or rear of vehicle 1. The battery device 2 can be used to power vehicle 1; for example, the battery device 2 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 102 and a motor 101. The controller 102 is used to control the battery to supply power to the motor 101, for example, to meet the power needs of vehicle 1 during starting, navigation, and driving.

[0069] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0070] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0071] The battery device 2 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 3, which are connected in series, parallel, or mixed connections via a busbar.

[0072] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 3.

[0073] As an example, the battery cell assembly can be a battery module 201, which is formed by arranging and fixing multiple battery cells 3 to form an independent module. As an example, the battery module 201 can be formed by binding multiple battery cells 3 together with cable ties.

[0074] In some embodiments, the battery device may be a battery pack, which includes a housing 202 and one or more battery cell assemblies housed in the housing 202.

[0075] As an example, the battery cell assembly can be a battery module 201, which can be housed in the housing by fixing the battery module 201 in the housing.

[0076] As an example, the battery cell assembly can also be housed in the housing 202 by directly fixing multiple battery cells 3 to the housing 202.

[0077] As an example, the housing 202 may include a first housing 2021 and a second housing 2022. The first housing 2021 and the second housing 2022 are fastened together, forming a closed space inside the housing 202 to house the battery cell assembly. Here, "closed" refers to covering or closing, which can be sealed or unsealed. The first housing 2021 may be a top cover or a bottom plate.

[0078] As an example, the housing 202 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 202 forms an enclosed space to accommodate the battery cell assembly.

[0079] In some embodiments, the housing 202 may be part of the vehicle's chassis structure. For example, a portion of the housing 202 may be at least a portion of the vehicle's floor, or a portion of the housing 202 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0080] Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of the application.

[0081] In some embodiments, as Figure 2 and Figure 3 As shown, there are multiple battery cells 3. These multiple battery cells 3 are first connected in series, parallel, or in a mixed manner to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing 202.

[0082] Multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 3 in the battery module 201.

[0083] In this application, the battery cell 3 may include a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited to this.

[0084] Figure 4 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application. Battery cell 3 refers to the smallest unit that makes up the battery. For example... Figure 4 The battery cell 3 includes a top cover assembly 6, a housing 4, and an electrode assembly 5.

[0085] Electrode assembly 5 is the component in the battery cell 3 where electrochemical reactions occur. The casing 4 may contain one or more electrode assemblies 5. Electrode assembly 5 is mainly formed by winding or stacking electrode sheets, which are divided into positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body, while the portions of the positive and negative electrode sheets without active material each constitute a tab 51. The positive and negative tabs can be located together at one end of the electrode body or separately at both ends of the electrode body. During the charging and discharging process of the battery cell 3, the positive and negative active materials react with the electrolyte, and the tabs 51 connect to the electrode terminals to form a current loop.

[0086] In some embodiments, the electrode assembly 5 is a stacked structure. As an example, multiple positive and negative electrodes can be provided, with multiple positive and multiple negative electrodes stacked alternately. Multiple spacers can be provided and respectively provided between any adjacent positive or negative electrodes. Alternatively, the spacers can be provided continuously and provided between any adjacent positive or negative electrodes by folding.

[0087] In some embodiments, the electrode assembly 5 may be flat or polygonal in shape.

[0088] In some embodiments, the electrode assembly 5 is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0089] The battery cell 3 may include a housing 4. The housing 4 is an assembly used to cooperate with the top cover assembly 6 to form the internal environment of the battery cell 3, wherein the formed internal environment can accommodate the electrode assembly 5, electrolyte (not shown in the figure), and other components. The housing 4 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc. In some embodiments, the housing 4 can be a sealed structure or a non-sealed structure. As an example, when the housing 4 is a non-sealed structure, the housing 4 serves to protect the electrode assembly 5, and a sealing bag is also included between the housing 4 and the electrode assembly 5. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 4 is a sealed structure, it is used to encapsulate the electrode assembly 5 and electrolyte, etc.

[0090] As an example, the battery cell 3 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.

[0091] The housing 4 and the top cover assembly 6 can be independent components. One or more openings can be provided on the housing 4, and one or more top cover assemblies 6 can close the openings to form the internal environment of the battery cell 3. Alternatively, the top cover assembly 6 and the housing 4 can be integrated. Alternatively, the top cover assembly 6 and the housing 4 can form a common connection surface before other components are inserted into the housing, and the top cover assembly 6 closes the housing 4 when it is necessary to encapsulate the interior of the housing 4.

[0092] Please see Figure 5 , Figure 5 This is a partial structural schematic diagram of a battery cell provided in one embodiment of this application.

[0093] First, as Figure 4 and Figure 5 As shown, this application embodiment provides a battery cell 3, which includes a housing 4, an electrode assembly 5, and a support member 7. The electrode assembly 5 is disposed inside the housing 4 and includes at least two electrode plates 52. The support member 7 is disposed inside the housing 4, with one end of the support member 7 disposed between two adjacent electrode plates 52 and the other end of the support member 7 extending out of the electrode assembly 5.

[0094] In the embodiment of this application, the battery cell 3 includes a housing 4, an electrode assembly 5, and a support 7. The electrode assembly 5 and the support 7 are disposed within the housing 4. The electrode assembly 5 includes at least two electrode plates 52. The support 7 is connected to the electrode assembly 5. One end of the support 7 is disposed between two adjacent electrode plates 52 so that the portion of the electrode assembly 5 located on both sides of the support 7 is subjected to uniform force. The support 7 and the electrode assembly 5 are stably connected. The other end of the support 7 extends out of the electrode assembly 5 so that after the electrode assembly 5 and the support 7 are disposed within the housing 4, the support 7 creates a gap between the electrode assembly 5 and the housing 4, thereby improving the problem of the electrode assembly 5 and the housing 4 being damaged by compression and enhancing the stability of the battery cell 3.

[0095] Specifically, the electrode assembly 5 includes several electrode plates 52. When the battery cell 3 is in use and stored, the electrode plates 52 are in contact with the inner wall of the housing 4 under the action of external force or their own gravity, or some of the electrode plates 52 protrude out of the electrode assembly and contact the housing 4. At this time, the electrode plates 52 are easily damaged due to mutual squeezing with the housing 4.

[0096] Optionally, the electrode assembly 5 includes at least two stacked electrodes 52, or the electrode assembly 5 includes at least two wound electrodes 52.

[0097] For example, the electrode assembly 5 includes at least two stacked electrode sheets 52, one end of the support member 7 is disposed between the two adjacent stacked electrode sheets 52, and the other end of the support member 7 extends out of the electrode assembly 5.

[0098] For example, the electrode assembly 5 includes at least two wound electrodes 52, an electrode tab 51 extending out of one end of the electrode assembly 5, a portion of the support 7 located between two adjacent wound electrodes 52, and another portion of the support 7 extending out of the end of the electrode assembly 5 away from the electrode tab 51.

[0099] One end of the support member 7 is disposed between two adjacent electrode plates 52, and the other end extends out of the electrode assembly 5. The electrode plates 52 include positive electrode plates and negative electrode plates. One end of the support member 7 is disposed between two adjacent positive electrode plates, and the other end of the support member 7 extends out of the positive electrode plate; or one end of the support member 7 is disposed between two adjacent negative electrode plates, and the other end of the support member 7 extends out of the negative electrode plate; or one end of the support member 7 is disposed between the positive electrode plate and the negative electrode plate, and the other end of the support member 7 extends out of the positive electrode plate and the negative electrode plate.

[0100] The support 7 is a rigid component so that it can be supported between the housing 4 and the electrode assembly 5. For example, the support 7 is made of polyethylene, polypropylene, or polyimide to give it good chemical stability.

[0101] Optionally, the support member 7 is disposed between two adjacent electrode plates 52, and the support member 7 is connected to the electrode plates 52 located on both sides thereon to improve the connection reliability between the support member 7 and the electrode assembly 5.

[0102] The electrode assembly 5 includes at least two electrode plates 52 and a spacer 53 disposed between adjacent electrode plates 52. The support member 7 and the spacer 53 are connected to support the electrode assembly 5, or when the support member 7 is made of insulating material, the support member 7 and the electrode plates 52 are connected to each other to support the electrode assembly 5. The specific size and shape of the support member 7 can be designed by the user. For example, the support member 7 is plate-shaped, rod-shaped, or strip-shaped.

[0103] Optionally, the thickness t of the support member 7 satisfies 0.1mm ≤ t ≤ 2mm, so that the support member 7 has sufficient structural strength to support the electrode assembly 5, and also improves the problem of low energy density of the battery cell 3 due to excessive weight of the support member 7. For example, the thickness of the support member 7 is 0.1mm, 1mm, or 2mm, etc.

[0104] Optionally, one end of the support member 7 is connected to the electrode assembly 5, and the connection method can be abutment, bonding, or welding.

[0105] Optionally, the support 7 is connected between the electrode assembly 5 and the housing 4, with the electrode assembly 5 and the housing 4 spaced apart to reduce the risk of damage to the electrode sheet 52 caused by the compression of the electrode assembly 5 and the housing 4.

[0106] Optionally, the support member 7 and the housing 4 are connected by abutment to reduce the difficulty of fitting the support member 7 and the housing 4; or the support member 7 and the housing 4 are connected by adhesive to improve the connection stability of the support member 7 and the housing 4.

[0107] In some embodiments, as Figure 4 and Figure 5 As shown, the electrode assembly 5 includes at least two stacked electrode plates 52, the electrode assembly 5 includes an electrode tab 51 extending along a first direction X, and the support member 7 extends out of the electrode assembly 5 along a second direction Y, the first direction X and the second direction Y intersect.

[0108] In these embodiments, the tab 51 extends out of the electrode assembly 5 along the first direction X, and the support 7 extends out of the electrode assembly 5 along the second direction Y, so that after the electrode assembly 5 and the support 7 are disposed in the housing 4, the support 7 makes the electrode assembly 5 and the housing 4 spaced apart along the second direction Y, so as to improve the problem of the electrode assembly 5 and the housing 4 being damaged by compression and improve the stability of the battery cell 3.

[0109] The housing 4 includes an opening at one or both ends in the first direction X, and the electrode assembly 5 includes tabs 51 extending from one or both ends in the first direction X. The electrode assembly 5 is placed inside the housing 4.

[0110] Optionally, the second direction Y can be the direction of gravity of the electrode assembly 5, in order to improve the problem that when the battery cell 3 is used and stored, the electrode 52 is in contact with the housing 4 due to its own gravity, and the electrode 52 is easily damaged by squeezing the housing 4.

[0111] The electrode assembly 5 includes tabs 51 extending along a first direction X. Specifically, the tabs 51 include a positive tab and a negative tab, which extend from the same end of the electrode assembly 5 in the first direction X, or from opposite ends of the electrode assembly 5 in the first direction X.

[0112] The electrode assembly 5 includes at least two electrodes 52 stacked along a third direction Z, with the first direction X, the second direction Y, and the third direction Z intersecting each other.

[0113] The electrode assembly 5 includes a first surface and a second surface disposed opposite to each other in the second direction Y. One end of the support member 7 extends out of the first surface so that when the electrode assembly 5 and the support member 7 are installed in the housing 4, the support member 7 creates a gap between the electrode assembly 5 and the housing 4. The first surface of the electrode assembly 5 and the housing 4 are spaced apart.

[0114] Optionally, the support member 7 is disposed at one end of the electrode assembly 5 in the third direction Z, and the support member 7 extends from the first surface and the second surface in the second direction Y.

[0115] Optionally, in the first direction X, the distance between the support member 7 and both ends of the electrode assembly 5 is the same, so that the electrode assembly 5 is subjected to uniform force when the support member 7 supports the electrode assembly 5.

[0116] Optionally, multiple support members 7 are spaced apart between two electrode plates 52 along a first direction X; or multiple support members 7 are spaced apart between electrode plates 52 along a third direction Z.

[0117] Optionally, the electrode 52 has a dimension of D1 in the first direction X, and the support member 7 has a dimension of D2 in the first direction X, satisfying D1 / 2 ≤ D2 < D1. When the dimensions of the electrode 52 and the support member 7 in the first direction X satisfy the above conditions, after the electrode assembly 5 and the support member 7 are disposed in the housing 4, the support member 7 and the housing 4 have a larger contact area, improving the stability of the support member 7; and the increased contact area between the electrode 52 and the support member 7 improves the connection reliability between the electrode assembly 5 and the support member 7.

[0118] In some embodiments, as Figure 4 and Figure 5 As shown, the electrode assembly 5 also includes an isolator 53, which includes a main body 531 and a bending portion 532. Multiple main bodies 531 are spaced apart, and each electrode 52 and each support member 7 are disposed between two adjacent main bodies 531. The bending portion 532 is connected to the same end of the adjacent main bodies 531 in the second direction Y. One end of the support member 7 is connected to the bending portion 532 along the second direction Y.

[0119] In these embodiments, the separator 53 includes a main body 531 and a bent portion 532. Multiple main bodies 531 are spaced apart, and each electrode 52 and each support 7 are disposed between two adjacent main bodies 531. The bent portion 532 is connected to the same end of adjacent main bodies 531 in the second direction Y. The separator 53 is used to maintain the insulation effect between adjacent electrodes 52 and between electrodes 52 and support 7. The support 7 and the bent portion 532 abut against each other without the need for additional connecting parts, which helps to reduce the difficulty of fitting the support 7 and the electrode assembly 5, reduce the weight of the battery cell 3, and increase the energy density of the battery cell 3.

[0120] The separator 53 can be a separator membrane, which can be a polyethylene film or a polypropylene film, etc.

[0121] The separator 53 and the electrode 52 are connected to each other as a whole. The separator 53 is continuously bent and extended. The separator 53 includes a main body 531 and a bent part 532 that are connected to each other. Each electrode 52 and the support member 7 are stacked along the third direction Z. The main body 531 is disposed between adjacent electrode 52 and between adjacent electrode 52 and support member 7. The bent part 532 is connected to one end of the adjacent main body 531 in the second direction Y. Two adjacent bent parts 532 in the third direction Z are connected to the two ends of the same main body 531 in the second direction Y.

[0122] Specifically, there is a main body 531 between the support member 7 and the two adjacent electrode plates 52. The two main body parts 531 are connected together by a bending part 532 and form a cavity with an opening in the second direction Y. One end of the support member 7 is disposed in the cavity and abuts against the bending part 532 along the second direction Y. The other end of the support member 7 extends out of the cavity from the opening of the cavity and abuts against the housing 4. The electrode plate 52 and the separator 53 are connected as a whole. The support member 7 can form a gap between the electrode assembly 5 and the housing 4 through the bending part 532.

[0123] Optionally, the dimension of the support member 7 in the second direction Y is larger than the dimension of each electrode 52 in the second direction Y, so that when one end of the support member 7 abuts against the bent portion 532, the other end can extend out of the electrode assembly 5 and be supported by the housing 4. The specific dimension of the support member 7 in the second direction Y can be flexibly designed.

[0124] Optionally, the support 7 is bonded to the bend 532 to enhance the connection reliability between the support 7 and the electrode assembly 5.

[0125] In some embodiments, as Figure 4 and Figure 5 As shown, the electrode 52 has a dimension of L1 in the second direction Y, and the support member 7 has a dimension of L2 in the second direction Y, satisfying that L2 > L1.

[0126] In these embodiments, when the electrode 52 has a dimension of L1 in the second direction Y and the support 7 has a dimension of L2 in the second direction Y, the support 7 can extend out of the electrode assembly 5 in the second direction Y. This allows the electrode assembly 5 and the housing 4 to be spaced apart along the second direction Y after the electrode assembly 5 and the support 7 are disposed in the housing 4, thereby improving the problem of the electrode assembly 5 and the housing 4 being damaged by compression and enhancing the stability of the battery cell 3.

[0127] Specifically, the electrode 52 has a dimension of L1 in the second direction Y, the support member 7 has a dimension of L2 in the second direction Y, and the housing 4 has a dimension of L3 in the second direction Y, where L1 < L2 ≤ L3.

[0128] Optionally, the dimensions of each electrode 52 in the second direction Y may differ. In this embodiment, the dimension of the support member 7 in the second direction Y is greater than the maximum dimension of the electrode 52 in the second direction Y.

[0129] The support member 7 is connected to the electrode 52. Specifically, the support member 7 and the electrode 52 are directly connected. For example, the support member 7 is made of insulating material, and the support member 7 and the electrode 52 are bonded together. Alternatively, the support member 7 and the electrode 52 are indirectly connected. For example, the support member 7 is connected to the electrode 52 through the insulating member 53.

[0130] Please see Figure 6 , Figure 6 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application.

[0131] In some embodiments, as Figure 4 and Figure 6 As shown, the electrode assembly 5 also includes a separator 53, which includes a main body portion 531 and a bent portion 532. Multiple main body portions 531 are spaced apart, and each electrode 52 and each support member 7 are disposed between adjacent main body portions 531. The bent portion 532 is connected to the same end of the adjacent main body portions 531 in the second direction Y. The support member 7 is bonded to at least one adjacent main body portion 531.

[0132] In these embodiments, the support 7 and at least one adjacent main body portion 531 are bonded together to improve the connection reliability of the support 7 and the electrode assembly 5.

[0133] Optionally, the support member 7 and the two adjacent main body parts 531 are bonded together to improve the connection reliability of the support member 7 and the electrode assembly 5.

[0134] Optionally, the support member 7, the main body 531, and the bending portion 532 are bonded together to improve the connection strength between the support member 7 and the electrode assembly 5.

[0135] Optionally, the support member 7 and the main body 531 are bonded together with an insulating adhesive to enhance the insulation effect between the support member 7 and the electrode assembly 5.

[0136] In some embodiments, as Figure 4 and Figure 6 As shown, the support member 7 has a transition fillet at the end that contacts the bend 532 in the second direction Y.

[0137] In these embodiments, the end of the support member 7 that contacts the bend 532 in the second direction Y is provided with a transition fillet to reduce the risk of the support member 7 damaging the bend 532 when the support member 7 contacts the bend 532.

[0138] The end of the support member 7 that contacts the bent portion 532 is provided with a transition fillet. The size of the transition fillet matches the size of the bent portion 532 so that the transition fillet of the bent portion 532 and the support member 7 fit together, thereby increasing the contact area between the support member 7 and the bent portion 532.

[0139] Optionally, the end where the support member 7 is connected to the housing 4 is a plane to reduce the processing difficulty of the support member 7; or the shape of the end where the support member 7 is connected to the housing 4 matches the shape of the housing 4. For example, if the housing 4 is a plane, then the end where the support member 7 is connected to the housing 4 is a plane; if the housing 4 is a curved surface, then the end where the support member 7 is connected to the housing 4 is a curved surface, so that the support member 7 can fit snugly against the housing 4.

[0140] Optionally, an adhesive layer may be provided at the end of the support member 7 that contacts the bent portion 532, or an adhesive layer may be provided on the surface of the support member 7, in order to reduce the risk of the bent portion 532 being punctured due to burrs at the end of the support member 7, which could lead to the failure of the electrode assembly 5.

[0141] In some embodiments, as Figure 4 and Figure 6 As shown, the thermal conductivity of the support 7 is greater than that of the insulating member 53.

[0142] In these embodiments, the thermal conductivity of the support 7 is greater than that of the separator 53. The support 7 can assist the electrode assembly 5 in dissipating heat, thereby enhancing the heat dissipation efficiency of the electrode assembly 5 and improving the performance of the battery cell 3.

[0143] In high-temperature environments, the support member 7 can transfer the heat of the electrode assembly 5 to the housing 4, and then from the housing 4 to the outside, thereby enhancing the heat dissipation effect of the electrode assembly 5. Alternatively, in low-temperature environments, external heat can be transferred to the electrode assembly 5 through the support member 7.

[0144] Optionally, the support member 7 is made of metal to enhance its structural strength, enabling it to more stably support the electrode assembly 5. The support member 7 is connected to the insulating member 53, and the support member 7 is insulated from the electrode assembly 5 through the insulating member 53. For example, the support member 7 may be made of copper, aluminum, or stainless steel.

[0145] Please see Figure 7 , Figure 7 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application.

[0146] In some embodiments, as Figure 4 and Figure 7 As shown, the electrode assembly 5 includes at least two electrode groups 54 spaced apart. Each electrode group 54 includes a positive electrode 521 and a negative electrode 522 stacked together. The support member 7 is located between two adjacent electrode groups 54. The negative electrode 522 is disposed at one end of the electrode group 54 facing the support member 7.

[0147] In these embodiments, the electrode assembly 5 includes at least two electrode groups 54 spaced apart. Each electrode group 54 includes a positive electrode 521 and a negative electrode 522 stacked together. A support member 7 is located between two adjacent electrode groups 54. A negative electrode 522 is disposed at one end of the electrode group 54 facing the support member 7, that is, the support member 7 is located between two negative electrode 522. This is to improve the problem that when the support member 7 is directly opposite the positive electrode 521, since the support member 7 has no lithium intercalation capability, lithium ions cannot be intercalated into the support member 7 after the positive electrode 521 is delithiated during the discharge of the battery cell 3, resulting in lithium plating on the adjacent negative electrode 522 due to excessive lithium intercalation.

[0148] The electrode assembly 5 includes an insulating member 53 and several electrode groups 54 spaced apart. Support members 7 are disposed between adjacent electrode groups 54, and the specific number of electrode groups 54 matches the number of support members 7.

[0149] The electrode group 54 includes positive electrode 521 and negative electrode 522 stacked in sequence. The specific number of positive electrode 521 and negative electrode 522 in the electrode group 54 can be designed by the user. The number of electrode 52 in each electrode group 54 may be the same or different.

[0150] The separator 53 is bent and extends between each positive electrode 521 and each negative electrode 522. The main body 531 is located between adjacent positive electrode 521 and negative electrode 522, or between adjacent positive electrode 521 and support member 7, or between adjacent negative electrode 522 and support member 7.

[0151] Optionally, the number of positive electrode plates 521 is less than the number of negative electrode plates 522 to reduce the risk of capacity imbalance in electrode assembly 5.

[0152] When the support member 7 is directly opposite the positive electrode 521, the positive electrode 521 undergoes lithium delithiation while the support member 7 lacks lithium insertion capability. This leads to over-lithiation of the negative electrode 522 adjacent to the positive electrode 521, resulting in lithium plating. Therefore, to reduce the risk of lithium plating on the electrode 52, in this embodiment, a negative electrode 522 is positioned at one end of two adjacent electrode groups 54 facing the support member 7, meaning the support member 7 is positioned between the two negative electrode groups 522.

[0153] For example, an electrode group 54 may include two positive electrode plates 521 and three negative electrode plates 522, with negative electrode plates 522 disposed at both ends of the electrode group 54, and the two positive electrode plates 521 disposed between two adjacent negative electrode plates 522; or an electrode group 54 may include one positive electrode plate 521 and two negative electrode plates 522, with negative electrode plates 522 disposed at both ends of the electrode group 54, and the negative electrode plates 522 disposed between two adjacent positive electrode plates 521.

[0154] Please see Figure 8 and Figure 9 , Figure 8 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application; Figure 9 This is a schematic diagram of the structure of the first electrode of a battery cell provided in an embodiment of this application.

[0155] In some embodiments, as Figure 4 , Figure 8 and Figure 9As shown, the electrode assembly 5 includes at least two electrode groups 54 spaced apart. Each electrode group 54 includes a positive electrode 521 and a negative electrode 522 stacked together. The support member 7 is located between two adjacent electrode groups 54. Each electrode 52 includes a current collector 551 and an active material layer 552 disposed on the current collector 551. The positive electrode 521 includes a first electrode 5211. The first electrode 5211 is disposed at one end of the electrode group 54 facing the support member 7, and the active material layer 552 of the first electrode 5211 is disposed on the side of its current collector 551 away from the support member 7.

[0156] In these embodiments, the first electrode 5211 is disposed at one end of the electrode assembly 54 facing the support member 7, the support member 7 is disposed between the two first electrodes 5211, and the active material layer 552 of the first electrode 5211 is disposed on the side of its current collector 551 facing away from the support member 7. Since the active material layer 552 is not disposed on the side of the first electrode 5211 facing the support member 7, the side of the first electrode 5211 facing the support member 7 will not exert its capacity. This can improve the lithium plating problem of the electrode 52 caused by the capacity imbalance between the positive electrode 521 and the negative electrode 522 in the electrode assembly 5.

[0157] In related technologies, the positive electrode 521 comprises a current collector 551 and an active material layer 552 coated on both sides of the current collector 551. In this embodiment, the support member 7 is disposed between two positive electrode sheets 521. To reduce the risk of lithium plating in the electrode assembly 5, this embodiment provides a positive electrode 521 with a special structure, namely, a first electrode 5211 with the active material layer 552 coated only on the side of the current collector 551 facing away from the support member 7. With the support member 7 disposed between the two first electrode sheets 5211, and no active material layer 552 on the side of the first electrode sheet 5211 facing the support member 7, lithium plating will not occur on the side of the first electrode sheet 5211 facing the support member 7, thus balancing the overall capacity of the electrode assembly 5 and improving the lithium plating problem of the electrode sheet 52.

[0158] The first electrode 5211 has an active material layer 552 on only one side of the current collector 551, which is lower in material cost than the conventional positive electrode 521 which has active material layers 552 on both sides.

[0159] Optionally, the positive electrode 521 includes a second electrode 5212 coated with an active material layer 552 on both sides of the current collector 551 and a first electrode 5211 coated with an active material layer 552 on one side of the current collector 551. The electrode group 54 may include both the second electrode 5212 and the first electrode 5211, or only the first electrode 5211.

[0160] For example, the electrode assembly 54 includes a first electrode 5211, a second electrode 5212, and two negative electrodes 522. The first electrode 5211 is disposed on the side of the electrode assembly 54 facing the support member 7, and the other electrodes 52 are stacked in sequence.

[0161] Please see Figure 10 and Figure 11 , Figure 10 This is a partial structural schematic diagram of a battery cell provided in another embodiment of this application; Figure 11 This is a partial structural schematic diagram of a battery cell provided in one embodiment of this application.

[0162] In some embodiments, as Figure 4 , Figure 10 and Figure 11 As shown, the electrode assembly 5 includes at least two electrode groups 54 spaced apart. Each electrode group 54 includes a positive electrode 521 and a negative electrode 522 stacked together. The support member 7 is located between two adjacent electrode groups 54. A positive electrode 521 is disposed at one end of the electrode group 54 facing the support member 7. The electrode assembly 5 also includes a barrier layer 553. The barrier layer 553 is disposed on the side of the two positive electrode 521 adjacent to the support member 7 facing the support member 7. The barrier layer 553 is used to block at least some ions from passing through.

[0163] In these embodiments, the electrode assembly 5 further includes a barrier layer 553 disposed on the side of the two positive electrode plates 521 adjacent to the support member 7 facing the support member 7. The barrier layer 553 is used to block at least some lithium ions from passing through. At this time, the side of the positive electrode plate 521 facing the support member 7 does not exert its capacity. This can improve the problem of lithium plating on the electrode plate 52 due to the capacity imbalance between the positive electrode plate 521 and the negative electrode plate 522 in the electrode assembly 5.

[0164] The positive electrode 521 located at the end of the electrode assembly 54 facing the support 7 has a barrier layer 553 on its surface facing the support 7. The barrier layer 553 covers the active material layer 552 of this positive electrode 521 to block the passage of ions. At this time, the positive electrode 521 adjacent to the support 7 will no longer experience lithium insertion and delithiation on its side facing the support 7, so the side of the positive electrode 521 facing the support 7 will not exert its capacity.

[0165] The barrier layer 553 can be an insulating adhesive layer. For example, the barrier layer 553 can be one or more of polyvinyl alcohol, polyvinyl ketone, polymethyl methacrylate, polyvinylidene fluoride, nano-silicone, polyacrylonitrile, polyacrylic acid, and styrene-butadiene rubber.

[0166] Optionally, the electrode assembly 5 includes multiple electrode groups 54 spaced apart and at least two support members 7. By adjusting the arrangement order of the positive electrode 521 and negative electrode 522 in the electrode group 54, the support member 7 can be located between two negative electrode 522, or between two first electrode 5211, or between two positive electrode 521 with a barrier layer 553, or between a first electrode 5211 and a positive electrode 521 with a barrier layer 553.

[0167] In some embodiments, as Figure 4 , Figures 7 to 11 As shown, the electrode assembly 5 also includes an isolator 53, which is disposed between the support 7 and the electrode group 54 to insulate the support 7 and the electrode group 54 from each other.

[0168] In these embodiments, the separator 53 is disposed between the support 7 and the electrode group 54 to insulate the support 7 and the electrode group 54 from each other, thereby reducing the risk of short circuit within the battery cell 3 due to the connection between the support 7 and the electrode group 54.

[0169] The isolator 53 includes a main body 531 and a bending portion 532. Multiple main bodies 531 are spaced apart. The electrode group 54 includes several electrodes 52. The support member 7 and each electrode 52 are disposed between two adjacent main bodies 531, or the main body 531 of the isolator 7 is disposed between adjacent electrodes 52 and adjacent electrodes 52 and support member 7. The bending portion 532 is connected to the same end of adjacent main bodies 531 in the second direction Y.

[0170] The isolator 53 is made of insulating material. The support 7 contacts the electrode 52 of the electrode assembly 54 through the isolator 53, so that the support 7 and the electrode assembly 54 are mutually insulated.

[0171] In some embodiments, as Figure 4 , Figure 5 and Figure 7 As shown, n support members 7 are connected to the electrode assembly 5, satisfying 1≤n≤10.

[0172] In these embodiments, when the number of support members 7 meets the above conditions, the support members 7 can not only play the role of supporting the electrode assembly 5, but also improve the problem that too many support members 7 will occupy too much internal space of the housing 4, resulting in low energy density of the battery cell 3.

[0173] Optionally, at least two support members 7 are respectively disposed between different electrode plates 52 along the second direction Y; or at least two support members 7 are disposed at intervals between two electrode plates 52 along the first direction X.

[0174] For example, one, two, five, or ten support members 7 are connected to the electrode assembly 5.

[0175] Secondly, embodiments of this application provide a battery device including the battery cell described in the first aspect embodiment above.

[0176] Thirdly, embodiments of this application provide an electrical device, including the battery device described in the second aspect of the embodiment above.

[0177] In some embodiments, as Figures 1 to 11 As shown, this application embodiment provides a battery cell 3, which includes a housing 4, an electrode assembly 5, and a support member 7. The electrode assembly 5 is disposed within the housing 4 and includes a tab 51 extending along a first direction X. One end of the support member 7 is connected to the electrode assembly 5, and the other end extends along a second direction Y from one side surface of the electrode assembly 5 in the second direction Y. The first direction X and the second direction Y intersect. The electrode assembly 5 includes at least two stacked electrode plates 52 and a separator 53. The support member 7 is disposed between two adjacent electrode plates 52, and the separator 53... The device includes a main body 531 and a bent portion 532. Multiple main bodies 531 are spaced apart. Each electrode 52 and each support member 7 is disposed between two adjacent main bodies 531. The bent portion 532 is connected to the same end of adjacent main bodies 531 in the second direction Y. One end of the support member 7 is connected to the bent portion 532 along the second direction Y. The end of the support member 7 that contacts the bent portion 532 in the second direction Y has a rounded corner. The support member 7 is bonded to at least one adjacent main body 531. The thermal conductivity of the support member 7 is greater than that of the insulating member 53.

[0178] The electrode assembly 5 includes at least two electrode groups 54 spaced apart. Each electrode group 54 includes a positive electrode 521 and a negative electrode 522 stacked together. A support member 7 is located between two adjacent electrode groups 54. The negative electrode 522 is disposed at one end of the electrode group 54 facing the support member 7. Alternatively, the positive electrode 521 includes a first electrode 5211, which is disposed at one end of the electrode group 54 facing the support member 7. The active material layer 552 of the first electrode 5211 is disposed on the side of its current collector 551 facing away from the support member 7. Alternatively, the support member 7 is located between two adjacent electrode groups 54, and the positive electrode 521 is disposed at one end of the electrode group 54 facing the support member 7. The electrode assembly 5 also includes a barrier layer 553, which is disposed on the side of the two positive electrodes 521 adjacent to the support member 7 facing the support member 7. The barrier layer 553 is used to block at least some ions from passing through.

[0179] In the embodiment of this application, the battery cell 3 includes a housing 4, an electrode assembly 5, and a support 7. The electrode assembly 5 and the support 7 are disposed within the housing 4. The electrode assembly 5 includes at least two electrode plates 52. The support 7 is connected to the electrode assembly 5. One end of the support 7 is disposed between two adjacent electrode plates 52 so that the portion of the electrode assembly 5 located on both sides of the support 7 is subjected to uniform force. The support 7 and the electrode assembly 5 are stably connected. The other end of the support 7 extends out of the electrode assembly 5 so that after the electrode assembly 5 and the support 7 are disposed within the housing 4, the support 7 creates a gap between the electrode assembly 5 and the housing 4, thereby improving the problem of the electrode assembly 5 and the housing 4 being damaged by compression and enhancing the stability of the battery cell 3.

[0180] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: case; An electrode assembly is disposed within the housing, the electrode assembly comprising at least two electrodes; A support member is disposed within the housing, with one end of the support member positioned between two adjacent electrodes and the other end of the support member extending out of the electrode assembly.

2. The battery cell according to claim 1, characterized in that, The electrode assembly includes at least two stacked electrodes, the electrode assembly includes a tab extending in a first direction, and the support extends out of the electrode assembly in a second direction, the first direction and the second direction intersecting.

3. The battery cell according to claim 1, characterized in that, The electrode assembly further includes a spacer, which comprises a main body and a bent portion. Multiple main bodies are spaced apart, and each electrode and each support member are disposed between two adjacent main bodies. The bent portion is connected to the same end of adjacent main bodies in a second direction. One end of the support member is connected to the bent portion along the second direction.

4. The battery cell according to claim 3, characterized in that, The electrode has a dimension of L1 in the second direction, and the support has a dimension of L2 in the second direction, satisfying that L2 > L1.

5. The battery cell according to claim 3 or 4, characterized in that, The electrode assembly further includes a spacer, which comprises a main body and a bent portion. Multiple main bodies are spaced apart, and each electrode and each support member are disposed between adjacent main bodies. The bent portion is connected to the same end of adjacent main bodies in a second direction. The support member is bonded to at least one of the adjacent main body parts.

6. The battery cell according to any one of claims 3-5, characterized in that, The support member has a transition fillet at the end that contacts the bent portion in the second direction.

7. The battery cell according to any one of claims 3-6, characterized in that, The thermal conductivity of the support is greater than that of the insulating member.

8. The battery cell according to claim 1, characterized in that, The electrode assembly includes at least two electrode groups spaced apart. Each electrode group includes a positive electrode and a negative electrode stacked together. The support is located between two adjacent electrode groups, and a negative electrode is disposed at one end of each electrode group facing the support.

9. The battery cell according to claim 1, characterized in that, The electrode assembly includes at least two electrode groups spaced apart, each electrode group comprising a positive electrode and a negative electrode stacked together. The support member is located between two adjacent electrode groups. Each electrode includes a current collector and an active material layer disposed on the current collector. The positive electrode includes a first electrode, which is disposed at one end of the electrode group facing the support member, and the active material layer of the first electrode is disposed on the side of its current collector facing away from the support member.

10. The battery cell according to claim 1, characterized in that, The electrode assembly includes at least two electrode groups spaced apart, each electrode group comprising a positive electrode and a negative electrode stacked together. The support member is located between two adjacent electrode groups, with the positive electrode disposed at one end of each electrode group facing the support member. The electrode assembly further includes a barrier layer disposed on the side of the two positive electrode plates adjacent to the support member facing the support member, the barrier layer being used to block at least a portion of the ions from passing through.

11. The battery cell according to any one of claims 8-10, characterized in that, The electrode assembly further includes an isolator disposed between the support and the electrode assembly to insulate the support and the electrode assembly from each other.

12. The battery cell according to any one of claims 1-11, characterized in that, n of the aforementioned support members and the electrode assembly are connected, satisfying 1≤n≤10.

13. A battery device, characterized in that, Includes the battery cell described in any one of claims 1-12 above.

14. An electrical appliance, characterized in that, Includes the battery device described in claim 13 above.

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