Battery cell, battery device, and electric device
By incorporating insulating components into the battery cell to gather the bent section of the tab, the short-circuit problem caused by the overflow of active material is solved, thereby improving the energy utilization rate of the battery cell and the service life of the tab.
Patent Information
- Application Number
- CN202422849139.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-21
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-11-21
AI Technical Summary
During use, the active material in existing battery cells is prone to overflow, causing a short circuit between the positive and negative electrode tabs, triggering self-discharge and reducing energy utilization.
By incorporating insulating components within the battery cell, the bent sections of the positive or negative electrode tabs can be grouped together, or their bent sections can be grouped together separately. This increases the collection of detached active material and reduces the likelihood of the active material remaining conductive.
It reduces self-discharge, improves the energy utilization rate of individual battery cells, extends the service life of the tabs, and reduces the leakage of active materials.
Smart Images
Figure CN223797495U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of battery, and more particularly, to a battery cell, a battery device and a power consumption device. BACKGROUND
[0002] Battery cells are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc.
[0003] In the development of battery technology, how to improve the energy utilization rate of the battery cell is a research direction in the battery technology. INNOVATION CONTENT
[0004] The present application provides a battery cell, a battery device and a power consumption device, which can improve the energy utilization rate of the battery cell.
[0005] The battery cell provided by the present application comprises a shell, an output pole assembly and an electrode assembly. The shell has a containing space. The output pole assembly comprises a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal are arranged on the shell. The electrode assembly is located in the containing space, and comprises a main body part, an insulating part, a plurality of positive electrode tabs and a plurality of negative electrode tabs. The positive electrode tabs and the negative electrode tabs are electrically connected to the main body part and located on the same side of the main body part. The positive electrode tabs and the negative electrode tabs each comprise a bending segment and a connecting segment connected to each other, and the connecting segment is connected to the main body part through the bending segment. At least part of the number of the bending segments of the positive electrode tabs are connected to the insulating part and gathered together through the insulating part, and / or at least part of the number of the bending segments of the negative electrode tabs are connected to the insulating part and gathered together through the insulating part. The connecting segments of the plurality of positive electrode tabs are electrically connected to the positive electrode terminal, and the connecting segments of the plurality of negative electrode tabs are electrically connected to the negative electrode terminal.
[0006] In the above technical solution, the battery cell of the present application gathers together at least part of the number of the bending segments of the positive electrode tabs or at least part of the number of the bending segments of the negative electrode tabs or the bending segments of both the positive electrode tabs and the negative electrode tabs through the insulating part. In this way, the active material that falls off can be gathered at the position where the tabs are gathered together by the insulating part along the tabs, thereby increasing the collection of the active material that falls off, reducing the overflow of the active material, reducing the possibility of the active material conducting the positive electrode tabs and the negative electrode tabs, reducing the self-discharge phenomenon, and improving the energy utilization rate of the battery cell.
[0007] In some embodiments, the bent segment gathered by the insulating component includes a first sub-segment and a second sub-segment, the first sub-segment, the second sub-segment, and the connecting segment are connected in sequence; at least a portion of the first sub-segments of the positive electrode tabs gather towards each other, the second sub-segments respectively connected to at least a portion of the first sub-segments are connected to the insulating component and gathered together through the insulating component, and / or, at least a portion of the first sub-segments of the negative electrode tabs gather towards each other, the second sub-segments respectively connected to at least a portion of the first sub-segments are connected to the insulating component and gathered together through the insulating component.
[0008] In the above technical solution, the insulating component is connected to the second sub-segment, and the second sub-segment is brought together, while the first sub-segment is not connected to the insulating component, which can reduce the amount of insulating component used and reduce costs.
[0009] In some embodiments, the bent segment gathered by the insulating component includes a first sub-segment and a second sub-segment, the first sub-segment, the second sub-segment, and the connecting segment are connected in sequence; at least a portion of the first sub-segments of the positive electrode tabs are connected to the insulating component and gathered together through the insulating component, the second sub-segments that are respectively connected to at least a portion of the first sub-segments are connected to the insulating component and gathered together through the insulating component, and / or, at least a portion of the first sub-segments of the negative electrode tabs are connected to the insulating component and gathered together through the insulating component, the second sub-segments that are respectively connected to at least a portion of the first sub-segments are connected to the insulating component and gathered together through the insulating component.
[0010] In the above technical solution, the first segment is connected to an insulating component, which not only enhances the collection effect of the bent segment on the detached toner, but also improves the insulation effect of the first segment, reducing the possibility of carbon powder causing conduction between the positive and negative electrode tabs.
[0011] In some embodiments, the insulating component includes an insulating film; the insulating film wraps around the outer periphery of at least a portion of the bent sections of the positive electrode tabs, and / or, the insulating film wraps around the outer periphery of at least a portion of the bent sections of the negative electrode tabs.
[0012] In the above technical solution, wrapping the insulating film around the outer periphery of at least a portion of the bent sections facilitates processing and provides a better gathering effect.
[0013] In some embodiments, the insulating component includes insulating adhesive; the insulating adhesive is applied to at least a portion of the bent sections of the positive electrode tabs, and / or, the insulating adhesive is applied to at least a portion of the bent sections of the negative electrode tabs.
[0014] In the above technical solution, the insulating adhesive has a good adhesion effect, which can make the bending section more cohesive.
[0015] In some embodiments, insulating adhesive is applied to the bent section of each positive electrode tab, and / or, insulating adhesive is applied to the bent section of each negative electrode tab.
[0016] In the above technical solution, the ability of the insulating adhesive to gather the bent section is improved, thereby further enhancing the ability to collect toner.
[0017] In some embodiments, the bent section includes a first end and a second end that are opposite to each other along a first direction, and insulating adhesive is continuously applied from the first end to the second end along the first direction, which is parallel to the arrangement direction of the positive to negative terminals.
[0018] The above technical solution can improve the ability of the insulating adhesive to gather the bent section and further improve the ability to collect toner.
[0019] In some embodiments, insulating adhesive is applied to one of the two opposing surfaces of the bent section.
[0020] The above technical solution can reduce the coating area, thereby improving coating efficiency.
[0021] In some embodiments, the insulating adhesive includes one of polystyrene, polypropylene, polyethylene, polytetrafluoroethylene, and polyimide.
[0022] In the above technical solutions, these materials have good adhesion, which can improve the ability to gather the bent sections and further improve the ability to collect toner.
[0023] In some embodiments, the insulating component includes an insulating adhesive film; the insulating adhesive film is wrapped around the outer periphery of a bent segment of a single positive electrode tab, and at least a portion of the bent segments of the positive electrode tabs are bonded together by the insulating adhesive film; and / or, the insulating adhesive film is wrapped around the outer periphery of a bent segment of a single negative electrode tab, and at least a portion of the bent segments of the negative electrode tabs are bonded together by the insulating adhesive film.
[0024] In the above technical solution, wrapping the bent sections with an insulating adhesive film can improve the gathering effect of at least a portion of the bent sections. Furthermore, it facilitates processing.
[0025] Secondly, embodiments of this application also provide a battery device, including a housing and the aforementioned battery cells, with the battery cells located inside the housing.
[0026] In some embodiments, along the height direction of the housing, a plurality of positive electrode tabs and a plurality of negative electrode tabs are located on the lower side of the main body.
[0027] In the above technical solution, the active material is more likely to fall between the positive and negative electrode tabs under the action of gravity. Therefore, the setting of the insulating component can greatly reduce the possibility of the positive and negative electrode tabs being connected.
[0028] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery device, which is used to provide electrical energy. Attached Figure Description
[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.
[0030] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;
[0031] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;
[0032] Figure 3 This is a schematic diagram of the structure of a battery cell assembly in a battery device provided in some embodiments of this application;
[0033] Figure 4 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;
[0034] Figure 5 A partial structural schematic diagram of a battery cell provided in some embodiments of this application;
[0035] Figure 6 This is a partial structural diagram of a battery cell before molding, provided in some embodiments of this application.
[0036] Figure 7 This is a schematic diagram of another partial structure of a battery cell before molding, provided in some embodiments of this application.
[0037] Figure 8 This is another partial structural diagram of a battery cell before molding, provided in some embodiments of this application.
[0038] The reference numerals in the accompanying drawings for the specific embodiments are as follows:
[0039] 100. Vehicle; 200. Battery unit; 300. Controller; 400. Motor; 500. Battery cell assembly; 600. Housing; 700. Battery cell;
[0040] 1. Outer shell; 11. Housing; 12. End cap;
[0041] 2. Output terminal assembly; 21. Positive terminal; 22. Negative terminal;
[0042] 3. Electrode assembly; 31. Main body; 32. Insulating component; 33. Positive electrode tab; 34. Negative electrode tab; 35. Bending section; 36. Connecting section; 37. First sub-segment; 38. Second sub-segment; 391. First end; 392. Second end;
[0043] 4. Current collection components;
[0044] X, the first direction. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.
[0047] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.
[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0050] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.
[0051] In this application, "multiple" means two or more (including two).
[0052] 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.
[0053] During the use of a battery cell, the active materials in the electrode assembly (which can be the active materials on the positive electrode or the active materials on the negative electrode, especially the graphite on the negative electrode) may be squeezed out and overflow between the positive and negative electrode tabs, causing a short circuit between the positive and negative electrode tabs, thus triggering self-discharge, resulting in faster performance degradation of the battery cell and lower energy utilization.
[0054] In view of this, this application provides a battery cell that, by setting an insulating component, causes the bent sections of the positive electrode tab to be gathered together, or the bent sections of the negative electrode tab to be gathered together, or the bent sections of both to be gathered together separately. In this way, the collection effect of detached active material can be increased, thereby reducing the possibility of the active material conducting through the positive and negative electrode tabs, reducing self-discharge, and improving the energy utilization rate of the battery cell.
[0055] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.
[0056] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.
[0057] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.
[0058] like Figure 1 As shown, a battery device 200 is provided inside the vehicle 100. The battery device 200 can be located at the bottom, front, or rear of the vehicle 100. The battery device 200 can be used to power the vehicle 100; for example, the battery device 200 can serve as the operating power source for the vehicle 100.
[0059] The vehicle 100 may also include a controller 300 and a motor 400. The controller 300 is used to control the battery device 200 to supply power to the motor 400, for example, for the power needs of the vehicle 100 during startup, navigation and driving.
[0060] In some embodiments of this application, the battery device 200 can not only serve as the operating power source for the vehicle 100, but also as the driving power source for the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.
[0061] Figure 2 This is a schematic diagram of the structure of a battery device provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of a battery cell assembly in a battery device provided in some embodiments of this application.
[0062] like Figure 2 and 3 As shown, the battery device 200 mentioned in the embodiments of this application may include one or more battery cell assemblies 500 for providing voltage and capacity. Each battery cell assembly 500 may include multiple battery cells 700, which are connected in series, parallel, or mixed connections via a busbar.
[0063] In some embodiments, the battery cell assembly 500 is typically formed by arranging a plurality of battery cells 700; as an example, the battery cell assembly 500 can be a battery module, which is formed by arranging and fixing a plurality of battery cells 700 into a single module. As an example, a battery module can be formed by bundling a plurality of battery cells 700 together with cable ties.
[0064] In some embodiments, the battery device 200 may be a battery pack, which includes a housing 600 and one or more battery cell assemblies 500, the battery cell assemblies 500 being housed in the housing 600.
[0065] As an example, the battery cell assembly 500 can be a battery module, and the battery cell assembly 500 can be housed in the housing 600 by fixing the battery module in the housing 600.
[0066] As an example, the battery cell assembly 500 can also be housed in the housing 600 by directly fixing multiple battery cells 700 to the housing 600.
[0067] As an example, the housing 600 may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing 600 to house the battery cell assembly 500. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.
[0068] As an example, the housing 600 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 600 forms an enclosed space to house the battery cell assembly 500.
[0069] As an example, the housing 600 can be part of the chassis structure of the vehicle 100. For example, the top cover of the housing 600 can be at least part of the floor of the vehicle 100, or the frame of the housing 600 can be at least part of the crossbeams and longitudinal beams of the vehicle 100.
[0070] In some embodiments, battery device 200 refers to an energy storage device, which includes a housing 600, and at least one side of the housing 600 has a door. The energy storage device includes energy storage containers, energy storage cabinets, etc.
[0071] Figure 4 This is an exploded structural diagram of a battery cell provided in some embodiments of this application; Figure 5 This is a partial structural diagram of a battery cell provided in some embodiments of this application.
[0072] like Figure 4 and Figure 5As shown, this application also provides a battery cell 700, which includes a housing 1, an output electrode assembly 2, and an electrode assembly 3. The housing 1 has a receiving space. The output electrode assembly 2 includes a positive terminal 21 and a negative terminal 22, both of which are disposed in the housing 1. The electrode assembly 3 is located in the receiving space and includes a main body 31, an insulating component 32, a plurality of positive electrode tabs 33, and a plurality of negative electrode tabs 34. The positive electrode tabs 33 and negative electrode tabs 34 are electrically connected to the main body 31 and located on the same side of the main body 31. The positive electrode tabs 33 and negative electrode tabs 34 each include a connected bending section 35 and a connecting section 36, with the connecting section 36 connected to the main body 31 through the bending section 35. At least a portion of the bent sections 35 of the positive electrode tabs 33 are connected to and converged together by the insulating component 32, and / or at least a portion of the bent sections 35 of the negative electrode tabs 34 are connected to and converged together by the insulating component 32. The connecting sections 36 of the plurality of positive electrode tabs 33 are electrically connected to the positive terminal 21, and the connecting sections 36 of the plurality of negative electrode tabs 34 are electrically connected to the negative terminal 22.
[0073] The outer casing 1 in this application embodiment 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 1), or an aluminum-plastic film, etc. In some embodiments, the outer casing 1 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 1 is a non-sealed structure, the outer casing 1 serves to protect the electrode assembly 3, and a sealing bag is also included between the outer casing 1 and the electrode assembly 3. The sealing bag is used to encapsulate the electrode assembly 3 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 1 is a sealed structure, it is used to encapsulate the electrode assembly 3 and the electrolyte, etc.
[0074] As an example, the battery cell 700 can be a prismatic battery cell, a pouch battery cell, or a battery cell 700 of other shapes. The prismatic battery cell 700 includes a prismatic battery cell 700, a blade-shaped battery cell 700, and a multi-prismatic battery, such as a hexagonal prismatic battery. There are no particular limitations in this application.
[0075] As an example, the housing 1 includes a housing 11 and an end cap 12. The housing 11 has an opening, and the end cap 12 covers the opening. The housing 11 may have one or more openings. The end cap 12 may also have one or more.
[0076] The positive terminal 21 of this application embodiment can be directly connected to the connecting section 36 of the positive electrode tab 33, or it can be indirectly connected to the connecting section 36 of the positive electrode tab 33 through the current collector 4. The positive terminal 21 can be disposed on the end cap 12 or on the housing 11. The negative terminal 22 is disposed in the same manner, and will not be described in detail here.
[0077] In this embodiment of the application, the positive electrode tab 33 and the negative electrode tab 34 are located on the same side of the main body portion 31, that is, the positive electrode tab 33 is located on the upper or lower side of the main body portion 31 at the same time, or in other cases.
[0078] The main body 31 of this embodiment includes a positive electrode, a negative electrode, and a separator. The battery cell 700 mainly operates by the movement of metal ions between the positive and negative electrode. 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 coating area, a positive electrode tab 33 is connected to the positive coating area, the positive coating area is coated with the positive active material layer, and the positive electrode tab 33 is not coated with the positive active material layer. Taking a lithium-ion battery cell 700 as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode sheet 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 electrode coating area, a negative electrode tab 34 is connected to the negative electrode coating area, the negative electrode coating area is coated with the negative active material layer, and the negative electrode tab 34 is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.
[0079] In this embodiment of the application, both the positive electrode tab 33 and the negative electrode tab 34 include a bending section 35 and a connecting section 36. The bending section 35 refers to the tab being bent so that the connecting section 36 of the positive electrode tab 33 is connected to the positive terminal 21, and the connecting section 36 of the negative electrode tab 34 is connected to the negative terminal 22.
[0080] The insulating component 32 of this application embodiment gathers together at least a portion of the bent segments 35 of the positive electrode tabs 33 or at least a portion of the bent segments 35 of the negative electrode tabs 34. For example, it can be an insulating strap to bind multiple bent segments 35 together; it can also be an insulating film that wraps around a single bent segment 35. Due to its adhesiveness, the film causes adjacent bent segments 35 to stick together, thereby achieving the adhesion of multiple bent segments 35.
[0081] Here, "gathering together" means that at least a portion of the bends 35 are gathered together, which can be two adjacent bends 35 abutting each other, or two adjacent bends 35 having an inconspicuous gap between them.
[0082] The insulating component 32 in this embodiment can be connected to the entire bending section 35 in its bending direction, or it can be connected to a portion of the bending section 35 in its bending direction.
[0083] The battery cell 700 of this application embodiment uses an insulating component 32 to gather at least a portion of the bent sections 35 of the positive electrode tabs 33 together, or at least a portion of the bent sections 35 of the negative electrode tabs 34 together, or gather the bent sections 35 of both together. In this way, the detached active material can be gathered along the tabs at the position where the tabs are gathered by the insulating component 32, thereby increasing the collection effect of the detached active material, reducing the spillage of active material, reducing the possibility of the active material conducting through the positive electrode tabs 33 and the negative electrode tabs 34, reducing self-discharge, and improving the energy utilization rate of the battery cell 700.
[0084] In addition, the insulating component 32 can also reduce the corrosive effect of the active material on the positive electrode tab 33 and / or the negative electrode tab 34, thereby improving the service life of the positive electrode tab 33 and / or the negative electrode tab 34.
[0085] Figure 6 This is a partial structural diagram of a battery cell before molding, provided in some embodiments of this application. It mainly shows the positive electrode sheet and the positive electrode tab 33.
[0086] Please see Figure 6 In some embodiments, the bent segment 35 gathered by the insulating member 32 includes a first sub-segment 37 and a second sub-segment 38, the first sub-segment 37, the second sub-segment 38 and the connecting segment 36 are connected in sequence; at least a portion of the first sub-segments 37 of the positive electrode tabs 33 gather towards each other, the second sub-segments 38 connected to at least a portion of the first sub-segments 37 are connected to the insulating member 32 and gathered together through the insulating member 32, and / or, at least a portion of the first sub-segments 37 of the negative electrode tabs 34 gather towards each other, the second sub-segments 38 connected to at least a portion of the first sub-segments 37 are connected to the insulating member 32 and gathered together through the insulating member 32.
[0087] For example, the first sub-segment 37, the second sub-segment 38, and the connecting segment 36 are integrally formed.
[0088] In this embodiment of the application, the first sub-segments 37 of at least a portion of the positive electrode tabs 33 converge towards each other, meaning that at least a portion of the first sub-segments 37 are close to each other, but not yet converged together, with a relatively obvious gap between adjacent first sub-segments 37. The same applies to the convergence of the first sub-segments 37 of at least a portion of the negative electrode tabs 34. In this embodiment of the application, the second sub-segments 38 connected to at least a portion of the first sub-segments 37 respectively refer to second sub-segments 38 belonging to the same positive electrode tab 33 or the same negative electrode tab 34 as at least a portion of the first sub-segments 37.
[0089] The insulating component 32 in this embodiment can be connected to the entire second sub-segment 38 in its bending direction, or it can be connected to a portion of the second sub-segment 38 in its bending direction.
[0090] By connecting the insulating component 32 to the second sub-segment 38 and bringing the second sub-segment 38 together, while the first sub-segment 37 is not connected to the insulating component 32, the amount of insulating component 32 used can be reduced, thus lowering costs.
[0091] Figure 7 This is a schematic diagram of another partial structure of a battery cell before molding, provided in some embodiments of this application, which mainly shows the positive electrode sheet and the positive electrode tab 33.
[0092] Please see Figure 7 In some embodiments, the bent segment 35 gathered by the insulating member 32 includes a first sub-segment 37 and a second sub-segment 38, the first sub-segment 37, the second sub-segment 38 and the connecting segment 36 are connected in sequence; at least a portion of the first sub-segments 37 of the positive electrode tabs 33 are connected to the insulating member 32 and gathered together through the insulating member 32, the second sub-segments 38 which are respectively connected to at least a portion of the first sub-segments 37 are connected to the insulating member 32 and gathered together through the insulating member 32, and / or, at least a portion of the first sub-segments 37 of the negative electrode tabs 34 are connected to the insulating member 32 and gathered together through the insulating member 32, the second sub-segments 38 which are respectively connected to at least a portion of the first sub-segments 37 are connected to the insulating member 32 and gathered together through the insulating member 32.
[0093] For example, the first sub-segment 37, the second sub-segment 38, and the connecting segment 36 are integrally formed.
[0094] In this embodiment of the application, the connection of at least a portion of the first segments 37 of the positive electrode tabs 33 to the insulating member 32 and their convergence towards each other through the insulating member 32 means that at least a portion of the first segments 37 are brought closer to each other through the insulating member 32, but are not yet converged together, and there is a relatively obvious gap between adjacent first segments 37. The connection of at least a portion of the first segments 37 of the negative electrode tabs 34 to the insulating member 32 and their convergence towards each other through the insulating member 32 is also in the same manner.
[0095] In this embodiment of the application, the first segment 37 is connected to the insulating component 32. This connection can be either a part of the first segment 37 being connected to the insulating component 32, or all of the first segment 37 being connected to the insulating component 32.
[0096] In this embodiment of the application, the second sub-segment 38 that is connected to at least a portion of the first sub-segments 37 refers to the second sub-segment 38 that belongs to the same positive electrode tab 33 or the same negative electrode tab 34 as at least a portion of the first sub-segments 37.
[0097] If the first segment 37 and the second segment 38 of the same tab in this application embodiment are both connected to the insulating component 32, they can be connected to the insulating component 32 with the same structure, or they can be connected to the insulating component 32 with different structures respectively.
[0098] The insulating component 32 in this embodiment can be connected to the entire second sub-segment 38 in its bending direction, or it can be connected to a portion of the second sub-segment 38 in its bending direction.
[0099] With this configuration, the first segment 37 is connected to the insulating component 32, which not only enhances the collection effect of the bent segment 35 on the detached toner, but also improves the insulation effect of the first segment 37, reducing the possibility of toner conduction between the positive electrode tab 33 and the negative electrode tab 34.
[0100] In some embodiments, the insulating component 32 includes an insulating film; the insulating film wraps around the outer periphery of at least a portion of the bent sections 35 of the positive electrode tabs 33, and / or, the insulating film wraps around the outer periphery of at least a portion of the bent sections 35 of the negative electrode tabs 34.
[0101] In this embodiment of the application, "the insulating component 32 wraps around the outer periphery of at least a portion of the bent segments 35" means that the insulating component 32 wraps around the bent segments 35 so that at least a portion of the bent segments 35 come together.
[0102] The insulating film of this application embodiment may be arranged in one or more loops around at least a portion of the bent segments 35.
[0103] For example, the insulating film has an adhesive layer on the surface facing the bend 35.
[0104] The insulating film in the embodiments of this application can be in the form of a strip or a bar.
[0105] Wrapping the insulating film around at least a portion of the outer periphery of the bent sections 35 facilitates processing and provides a better gathering effect.
[0106] Figure 8 This is a partial structural diagram of a battery cell before molding, provided in some embodiments of this application, which mainly shows the positive electrode sheet and the positive electrode tab 33.
[0107] Please see Figure 8 In some embodiments, the insulating component 32 includes an insulating adhesive; the insulating adhesive is applied to at least a portion of the bent sections 35 of the positive electrode tabs 33, and / or, the insulating adhesive is applied to at least a portion of the bent sections 35 of the negative electrode tabs 34.
[0108] The insulating adhesive in this application embodiment can be polysulfone, polyarylate, polyurethane, furan, allyl ester, phenolic, unsaturated polyester, silicone, amino plastic, polycarbonate, thermoplastic polyester, nylon, modified polyphenylene ether, or thermoplastic polyester, etc.
[0109] For example, insulating adhesive is applied to the bent sections 35 of a portion of the positive electrode tabs 33. The electrode assembly 3 is a wound electrode assembly 3. The insulating adhesive is applied every other positive electrode tab 33, that is, one is applied to every two adjacent positive electrode tabs 33.
[0110] For example, insulating adhesive is applied to the bent sections 35 of a portion of the positive electrode tabs 33. The electrode assembly 3 is a stacked electrode assembly 3. The adhesive is applied every other positive electrode tab 33 in the thickness direction of the electrode assembly 3, or every other positive electrode tab 33.
[0111] For a bend 35, insulating adhesive can be applied to both opposite surfaces of the bend 35, or to one surface of the bend 35. On a surface, it can be applied to the entire surface or to a portion of the surface.
[0112] With this setup, the insulating adhesive has a better adhesion effect, which allows for a better gathering effect of the bent section 35.
[0113] Please see Figure 6 and Figure 7 In some embodiments, insulating adhesive is applied to the bend 35 of each positive electrode tab 33, and / or, insulating adhesive is applied to the bend 35 of each negative electrode tab 34.
[0114] For a bend 35, insulating adhesive can be applied to both opposite surfaces of the bend 35, or to one surface of the bend 35. On a surface, it can be applied to the entire surface or to a portion of the surface.
[0115] The insulating adhesive of this application embodiment can be applied to the same area of multiple bending segments 35, or it can be applied to different areas of multiple bending segments 35.
[0116] This configuration enhances the binding force of the insulating adhesive on the bend 35, thereby further improving the collection capacity of the toner.
[0117] Please see Figure 7 and Figure 8 In some embodiments, the bent section 35 includes a first end 391 and a second end 392 opposite to each other along a first direction X. Insulating adhesive is continuously applied from the first end 391 to the second end 392 along the first direction X, which is parallel to the arrangement direction of the positive terminal 21 to the negative terminal 22.
[0118] In this embodiment, the insulating adhesive can be applied to part or all of the bending segment 35 in its bending direction, wherein the bending direction intersects with the first direction X.
[0119] This configuration improves the binding force of the insulating adhesive on the bend 35, further enhancing the collection of toner.
[0120] In some embodiments, insulating adhesive is applied to one of the two opposing surfaces of the bent section 35.
[0121] For different bends 35, the insulating adhesive can be applied to the same side surface or to different sides. For the surface being coated, the insulating adhesive can be applied to the entire surface or only a portion of it.
[0122] This setup reduces the coating area, thereby improving coating efficiency.
[0123] In some embodiments, the insulating adhesive includes one of polystyrene, polypropylene, polyethylene, polytetrafluoroethylene, and polyimide.
[0124] These materials have good adhesion, which can improve the ability to gather the toner in the bend 35 and further improve the ability to collect toner.
[0125] In some embodiments, the insulating component 32 includes an insulating adhesive film; the insulating adhesive film is wrapped around the outer periphery of the bent section 35 of a single positive electrode tab 33, and at least a portion of the bent sections 35 of the positive electrode tabs 33 are bonded together by the insulating adhesive film, and / or, the insulating adhesive film is wrapped around the outer periphery of the bent section of a single negative electrode tab 34, and at least a portion of the bent sections 35 of the negative electrode tabs 34 are bonded together by the insulating adhesive film.
[0126] In at least a portion of the bent segments 35 of the positive electrode tabs 33 in this application embodiment, each positive electrode tab 33 may be wrapped with an insulating adhesive film, or one positive electrode tab 33 may be wrapped every other positive electrode tab 33. The same applies to the negative electrode tab 34.
[0127] The insulating adhesive film of this embodiment is adhesive at least on the side in contact with an adjacent insulating adhesive film. The insulating adhesive film wraps around the bend 35 at least once.
[0128] By wrapping individual bends 35 with an insulating adhesive film, at least a portion of the bends 35 can achieve a better convergence effect. Furthermore, this also facilitates processing.
[0129] This application embodiment also provides a battery device 200, including the above-mentioned battery cell 700 and housing 600, with the battery cell 700 located inside the housing 600.
[0130] In some embodiments, along the height direction of the housing 600, a plurality of positive electrode tabs 33 and a plurality of negative electrode tabs 34 are located on the lower side of the main body 31.
[0131] Optionally, the battery cell 700 is disposed upside down in the housing 600.
[0132] In this way, the active material is more likely to fall between the positive electrode tab 33 and the negative electrode tab 34 under the action of gravity. Therefore, the setting of the insulating component 32 can greatly reduce the possibility of the positive electrode tab 33 and the negative electrode tab 34 being connected.
[0133] This application embodiment also provides an electrical device, including the battery device 200 described above, which is used to provide electrical energy.
[0134] Please see Figures 3-8 This application provides a battery cell 700, which includes a housing 1, an output electrode assembly 2, and an electrode assembly 3. The housing 1 has a receiving space. The output electrode assembly 2 includes a positive terminal 21 and a negative terminal 22, both of which are disposed in the housing 1. The electrode assembly 3 is located in the receiving space and includes a main body 31, an insulating component 32, a plurality of positive electrode tabs 33, and a plurality of negative electrode tabs 34. The positive electrode tabs 33 and negative electrode tabs 34 are electrically connected to the main body 31 and located on the same side of the main body 31. The positive electrode tabs 33 and negative electrode tabs 34 each include a connected bending section 35 and a connecting section 36, with the connecting section 36 connected to the main body 31 through the bending section 35. At least a portion of the bent sections 35 of the positive electrode tabs 33 are connected to and gathered together by the insulating component 32, and / or at least a portion of the bent sections 35 of the negative electrode tabs 34 are connected to and gathered together by the insulating component 32. The connecting sections 36 of the plurality of positive electrode tabs 33 are electrically connected to the positive terminal 21, and the connecting sections 36 of the plurality of negative electrode tabs 34 are electrically connected to the negative terminal 22. The insulating component 32 includes insulating adhesive; the insulating adhesive is applied to at least a portion of the bent sections 35 of the positive electrode tabs 33, and / or, the insulating adhesive is applied to at least a portion of the bent sections 35 of the negative electrode tabs 34. The bent section 35 includes a first end 391 and a second end 392 opposite to each other along a first direction X, and the insulating adhesive is continuously applied along the first direction X from the first end 391 to the second end 392, the first direction X being parallel to the arrangement direction of the positive terminal 21 to the negative terminal 22.
[0135] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A battery cell, characterized in that, include: The outer shell has a storage space; The output terminal assembly includes a positive terminal and a negative terminal, both of which are disposed within the housing; An electrode assembly is located in the receiving space. The electrode assembly includes a main body, an insulating component, a plurality of positive electrode tabs, and a plurality of negative electrode tabs. The positive electrode tabs and the negative electrode tabs are electrically connected to the main body and located on the same side of the main body. The positive electrode tabs and the negative electrode tabs each include a connected bent section and a connecting section. The connecting section is connected to the main body through the bent section. Wherein, at least a portion of the bent sections of the positive electrode tabs are connected to the insulating component and gathered together through the insulating component, and / or, at least a portion of the bent sections of the negative electrode tabs are connected to the insulating component and gathered together through the insulating component; The connecting segments of the plurality of positive electrode tabs are electrically connected to the positive terminal, and the connecting segments of the plurality of negative electrode tabs are electrically connected to the negative terminal.
2. The battery cell according to claim 1, characterized in that, The bent segment gathered by the insulating component includes a first sub-segment and a second sub-segment, and the first sub-segment, the second sub-segment, and the connecting segment are connected in sequence; At least a portion of the first segments of the positive electrode tabs converge toward each other, and the second segments, which are respectively connected to at least a portion of the first segments, are connected to the insulating component and converge together through the insulating component; and / or, at least a portion of the first segments of the negative electrode tabs converge toward each other, and the second segments, which are respectively connected to at least a portion of the first segments, are connected to the insulating component and converge together through the insulating component.
3. The battery cell according to claim 1, characterized in that, The bent segment gathered by the insulating component includes a first sub-segment and a second sub-segment, and the first sub-segment, the second sub-segment, and the connecting segment are connected in sequence; At least a portion of the first segments of the positive electrode tabs are connected to the insulating component and converge toward each other through the insulating component; the second segments, which are respectively connected to at least a portion of the first segments, are connected to the insulating component and converge together through the insulating component; and / or, at least a portion of the first segments of the negative electrode tabs are connected to the insulating component and converge toward each other through the insulating component; the second segments, which are respectively connected to at least a portion of the first segments, are connected to the insulating component and converge together through the insulating component.
4. The battery cell according to claim 1, characterized in that, The insulating component includes an insulating film; The insulating film is wrapped around the outer periphery of the bent sections of at least a portion of the positive electrode tabs, and / or the insulating film is wrapped around the outer periphery of the bent sections of at least a portion of the negative electrode tabs.
5. The battery cell according to any one of claims 1-4, characterized in that, The insulating component includes insulating adhesive; The insulating adhesive is applied to at least a portion of the bent sections of the positive electrode tabs, and / or the insulating adhesive is applied to at least a portion of the bent sections of the negative electrode tabs.
6. The battery cell according to claim 5, characterized in that, The insulating adhesive is applied to the bent section of each of the positive electrode tabs, and / or the insulating adhesive is applied to the bent section of each of the negative electrode tabs.
7. The battery cell according to claim 5, characterized in that, The bent section includes a first end and a second end that are opposite to each other along a first direction. The insulating adhesive is continuously applied from the first end to the second end along the first direction, which is parallel to the arrangement direction of the positive terminal to the negative terminal.
8. The battery cell according to claim 5, characterized in that, The insulating adhesive is applied to one of the two opposing surfaces of the bent section.
9. The battery cell according to claim 5, characterized in that, The insulating adhesive includes one of polystyrene, polypropylene, polyethylene, polytetrafluoroethylene, and polyimide.
10. The battery cell according to claim 1, characterized in that, The insulating component includes an insulating adhesive film; The insulating adhesive film is wrapped around the outer periphery of the bent section of a single positive electrode tab, and at least a portion of the bent sections of the positive electrode tabs are bonded together by the insulating adhesive film. And / or, the insulating adhesive film is wrapped around the outer periphery of the bent section of a single negative electrode tab, and at least a portion of the bent sections of the negative electrode tabs are bonded together by the insulating adhesive film.
11. A battery device, characterized in that, It includes a housing and a battery cell as described in any one of claims 1-10, wherein the battery cell is located within the housing.
12. The battery device according to claim 11, characterized in that, Along the height direction of the housing, a plurality of positive electrode tabs and a plurality of negative electrode tabs are located on the lower side of the main body.
13. An electrical appliance, characterized in that, Includes the battery device as described in claim 11 or 12, the battery device being used to provide electrical energy.