Electrode structure, battery structure, electrical device
By setting insulating layers of different areas in the electrode structure, the support and insulation of the electrode tabs are enhanced, which solves the problem of poor reliability of individual battery cells, improves the reliability of the battery and the stability of electrical connections, and optimizes heat distribution and power transmission efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CALB GROUP CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-07-31
AI Technical Summary
The reliability of individual battery cells is poor, especially the problem of short circuits easily occurring between the tabs and the cell.
Design an electrode structure in which first and second insulating layers are provided on both sides of the electrode tab. The area of the first insulating layer is smaller than that of the second insulating layer. The second insulating layer provides support to prevent the electrode tab from deforming and being mistakenly inserted into the battery cell, thereby enhancing the reliability of the electrode tab.
By enhancing the insulation and support of the tabs, the possibility of short circuits between the tabs and the cell is reduced, improving battery reliability and electrical connection stability, optimizing heat distribution, reducing resistance, and extending battery life.
Smart Images
Figure CN224582255U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical energy storage technology, specifically to an electrode structure, a battery structure, and an electrical device. Background Technology
[0002] Currently, battery energy storage technology is widely used in various stages of power generation, transmission, distribution, and consumption, and is also applied in fields such as frequency regulation, peak shaving, microgrids, and user-side energy storage. The development of battery technology requires consideration of multiple design factors, such as energy density, cycle life, and reliability. The design of the electrodes in a battery cell is crucial to its reliability. Therefore, how to provide an electrode that improves the reliability of a battery cell is a pressing technical problem that needs to be solved. Utility Model Content
[0003] The main objective of this invention is to provide an electrode structure, a battery structure, and an electrical device to solve the problem of poor reliability of individual battery cells in related technologies.
[0004] To achieve the above objectives, according to one aspect of the present invention, an electrode structure is provided, comprising: a body portion; an electrode tab portion connected to one end of the body portion; a first insulating layer and a second insulating layer disposed at the same end of the body portion as the electrode tab portion, and stacked on both sides of the electrode tab portion; wherein the projection of the first insulating layer in a preset plane has a first area, the projection of the second insulating layer in the preset plane has a second area, the first area is smaller than the second area, and the preset plane is perpendicular to the stacking direction of the first insulating layer, the electrode tab portion and the second insulating layer.
[0005] According to another aspect of the present invention, a battery structure is provided, including an electrode structure, wherein the electrode structure is the electrode structure described above.
[0006] According to another aspect of the present invention, an electrical device is provided, comprising a plurality of battery structures, wherein the battery structures are as described above.
[0007] Applying the above technical solution, the main body forms the mounting base for the electrode structure and is used to support other structures of the electrode structure. The main body can achieve electrical connection with the battery cell. The tab is connected to one end of the main body, and the tab enables electrical connection between the battery cell and other external structures. The first insulating layer and the second insulating layer are both located at the same end of the main body as the tab and are stacked on both sides of the tab. The first insulating layer and the second insulating layer can insulate the tab from both sides, thereby enhancing the reliability of the tab. The projection of the first insulating layer in a preset plane has a first area, and the second insulating layer has a first area in the preset plane. Assume the projection in the plane has a second area. The plane is pre-set to be perpendicular to the stacking direction of the first insulating layer, the tab, and the second insulating layer. Since the first area is smaller than the second area, the second insulating layer, with its larger area, can provide support for the tab. Furthermore, because the supporting area of the second insulating layer is larger, the second insulating layer provides better support when the end of the tab away from the body bends towards it. This makes it less likely for the end of the tab away from the body to be mistakenly inserted into the cell due to deformation, thereby reducing the possibility of short circuits between the tab and the cell and improving battery reliability. Therefore, the technical solution of this application can effectively solve the problem of poor reliability of battery cells in related technologies. Attached Figure Description
[0008] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:
[0009] Figure 1 A three-dimensional structural schematic diagram of an embodiment of the electrode structure according to the present invention is shown;
[0010] Figure 2 It shows Figure 1 A three-dimensional structural diagram of the electrode structure from another angle;
[0011] Figure 3 It shows Figure 2 An enlarged schematic diagram of point A of the electrode structure;
[0012] Figure 4 It shows Figure 1 A side view of the electrode structure;
[0013] Figure 5 A three-dimensional structural schematic diagram of an embodiment of the battery structure according to the present invention is shown.
[0014] The above figures include the following reference numerals:
[0015] H1, height of the first insulating layer; H2, height of the second insulating layer;
[0016] 10. Body part;
[0017] 20. The outermost part of the ear;
[0018] 31. First insulating layer; 32. Second insulating layer;
[0019] 41. Housing; 411. Receiving space; 42. Battery cell; 43. Terminal; 44. Busbar. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0023] like Figure 1 as well as Figure 4As shown, this application provides an electrode structure. An embodiment of the electrode structure of this application includes: a body portion 10, an electrode tab portion 20, a first insulating layer 31, and a second insulating layer 32; the electrode tab portion 20 is connected to one end of the body portion 10; the first insulating layer 31 and the second insulating layer 32 are both disposed at the same end of the body portion 10 as the electrode tab portion 20, and are stacked on both sides of the electrode tab portion 20; wherein, the projection of the first insulating layer 31 in a preset plane has a first area, and the projection of the second insulating layer 32 in the preset plane has a second area, the first area is smaller than the second area, and the preset plane is perpendicular to the stacking direction of the first insulating layer 31, the electrode tab portion 20, and the second insulating layer 32.
[0024] Applying the technical solution of this embodiment, the body portion 10 forms the mounting base of the electrode structure and is used to support other structures of the electrode structure. The body portion 10 can achieve electrical connection with the battery cell. The tab portion 20 is connected to one end of the body portion 10. The tab portion 20 enables electrical connection between the battery cell and other external structures. The first insulating layer 31 and the second insulating layer 32 are both disposed at the same end of the body portion 10 as the tab portion 20 and are stacked on both sides of the tab portion 20. The first insulating layer 31 and the second insulating layer 32 can insulate the tab portion 20 from both sides, thereby enhancing the reliability of the tab portion 20. The projection of the first insulating layer 31 in the preset plane has a first area. The projection of the second insulating layer 32 onto a preset plane has a second area. This preset plane is perpendicular to the stacking direction of the first insulating layer 31, the tab 20, and the second insulating layer 32. Since the first area is smaller than the second area, the second insulating layer 32, with its larger area, can provide support for the tab 20. Furthermore, because the supporting area of the second insulating layer 32 is larger, its supporting effect is better when the end of the tab 20 away from the body 10 bends. This makes it less likely that the end of the tab 20 away from the body 10 will be mistakenly inserted into the battery cell due to deformation, thereby reducing the possibility of a short circuit between the tab 20 and the battery cell and improving battery reliability. Therefore, the technical solution of this embodiment can effectively solve the problem of poor reliability of battery cells in related technologies.
[0025] Furthermore, in this embodiment, the ratio of the first area to the second area is greater than or equal to 0.3 and less than or equal to 0.8. Specifically, satisfying the above requirements for the ratio of the first area to the second area serves two purposes: firstly, the ratio is not too large, avoiding the first and second areas becoming too close, thus preventing the first area from becoming too large and reducing the electrical contact area between the tab 20 and the external structure. This ensures that the electrical contact area between the tab 20 and the external structure is sufficient to maintain good electrical conductivity and power transmission efficiency. This balance avoids increased resistance and energy loss due to excessive insulation. Secondly, the ratio is not too small, avoiding the first area becoming too small, which in turn avoids poor insulation and ensures good reliability of the electrode structure. In addition, an appropriate ratio of the first area to the second area helps optimize the heat distribution inside the cell and prevents local overheating, which is crucial for improving the thermal stability of the battery and extending its service life. It also ensures the rational use of the materials of the first insulating layer 31 and the second insulating layer 32, reducing unnecessary waste while maintaining stable battery performance. In this embodiment, the ratio of the first area to the second area can be 0.3, 0.44, 0.55, 0.67, 0.73 or 0.8.
[0026] Furthermore, in this embodiment, the tab portion 20 is a sheet-like structure with a third area, wherein the ratio of the first area to the third area is greater than or equal to 0.06 and less than or equal to 0.2; and the ratio of the second area to the third area is greater than or equal to 0.075 and less than or equal to 0.4. Specifically, through the above-mentioned optimization of the first and second areas, it can be ensured that the tab portion 20 has sufficient contact area when electrically connected to an external structure, thereby ensuring good electrical connectivity. This helps to reduce connection resistance and improve the power output capability of the battery. The first insulating layer 31 and the second insulating layer 32 cover the key parts of the tab portion 20 appropriately, ensuring the necessary insulation performance while avoiding excessive use of materials, thus ensuring electrical safety while also considering cost-effectiveness. In this embodiment, the ratio of the first area to the third area can be 0.06, 0.08, 0.1, 0.135, 0.188 or 0.2; the ratio of the second area to the third area can be 0.075, 0.09, 0.1, 0.25, 0.33 or 0.4.
[0027] like Figures 1 to 4As shown, the height H1 of the first insulating layer 31 is less than the height H2 of the second insulating layer 32. Specifically, this arrangement makes the height H2 of the second insulating layer 32 larger, thereby further enhancing the support strength of the second insulating layer 32 for the tab 20 in the direction of extension of the tab 20. This makes the second insulating layer 32 provide better support when the end of the tab 20 away from the body 10 bends toward the second insulating layer 32, making it more difficult for the end of the tab 20 away from the body 10 to be mistakenly inserted into the cell due to deformation. This reduces the possibility of short circuit between the tab 20 and the cell, thereby improving the reliability of the battery.
[0028] Furthermore, in this embodiment, the height H1 of the first insulating layer 31 is greater than or equal to 1.5 mm and less than or equal to 4 mm; the height H2 of the second insulating layer 32 is greater than or equal to 1.8 mm and less than or equal to 6 mm. The height H1 of the first insulating layer 31 is set within a reasonable range to ensure sufficient electrical insulation to prevent short circuits, while maintaining low internal resistance to promote smooth current flow, thereby optimizing the battery's conductivity. Too low a height may not provide adequate insulation protection, while too high a height may increase unnecessary resistance and affect battery efficiency. The height H2 of the second insulating layer 32 also needs to be designed reasonably to provide more comprehensive insulation protection, especially in complex and high-stress application environments. A suitable height can prevent potential electrical faults and ensure that the heat inside the cell can be effectively dissipated, maintaining the battery's thermal stability. At the same time, an appropriate height also ensures that the second insulating layer 32 is not too heavy, so as not to affect the cell's compactness and overall energy density. In this embodiment, the height H1 of the first insulating layer 31 can be 1.5mm, 1.8mm, 2.2mm, 3mm, 3.7mm or 4mm; the height H2 of the second insulating layer 32 can be 1.8mm, 2mm, 3.8mm, 4.4mm, 5.6mm or 6mm.
[0029] In addition, such as Figure 5 As shown, this application also provides a battery structure, which includes an electrode structure, wherein the electrode structure is the aforementioned electrode structure. The aforementioned electrode structure can effectively solve the problem of poor reliability of individual battery cells in related technologies, and the battery structure having the aforementioned electrode structure also has the aforementioned advantages.
[0030] like Figure 5As shown, the battery structure also includes a housing 41, a cell 42, and terminals 43. The housing 41 has a receiving space 411, within which the cell 42 and the electrode structure are disposed. The terminals 43 are disposed on the housing 41, and the electrode structure is connected between the terminals 43 and the cell 42. Specifically, the housing 41 provides protection for the other structures of the battery structure, the cell 42 performs the basic energy storage function of the battery structure, the terminals 43 are used to realize the electrical connection between the battery structure and other external structures, and the electrode structure is electrically connected between the terminals 43 and the cell 42, thereby forming an electrical connection path between the cell 42, the electrode structure, the terminals 43, and other external structures, thus achieving stable power transmission.
[0031] like Figure 5 As shown, there are multiple battery cells, each with an electrode structure. The battery structure also includes a busbar 44 disposed within the receiving space 411. The tabs 20 of the electrode structures are connected to the terminals 43 through the busbar 44. Specifically, the arrangement of multiple battery cells 42 ensures both power transmission efficiency and energy storage density, resulting in a battery structure with both good power transmission efficiency and high energy storage density. The busbar 44 connects the tabs 20 of the multiple electrode structures together, thereby connecting the multiple tabs 20 to the terminals 43 and forming a stable power transmission path.
[0032] Furthermore, in some embodiments, particularly in a battery structure referred to as a "wound cell", the cell portion 42 is a wound structure and has a winding axis. The first end of the cell portion 42 is close to the winding axis, and the second end of the cell portion 42 is away from the winding axis. There are multiple tabs 20 of the electrode structure. The multiple tabs 20 are spaced apart from the first end to the second end of the cell portion 42. The distance between two adjacent tabs 20 gradually increases in the direction from the first end to the second end of the cell portion 42, so that the projections of the multiple tabs 20 in a preset plane coincide. Specifically, since the battery cell 42 is formed by winding, regardless of whether the cross-section of the winding structure is circular, elliptical or other shapes, the distance traversed by the winding structure from the center to the outer edge through the preset angle gradually increases. In order to make the busbar 44 easier to set up, the spacing between two adjacent tabs 20 is gradually increased in the direction from the first end to the second end of the battery cell 42, so that the multiple tabs 20 can be projected to overlap in the preset plane after winding, thereby making the busbar 44 easier to set up.
[0033] Furthermore, in some embodiments, particularly in battery structures referred to as "stacked cells," the cell portion 42 includes multiple electrode assemblies stacked together. Each electrode assembly includes a cathode portion (i.e., the cathode sheet mentioned later), a separator portion (i.e., the separator mentioned later), and an anode portion (i.e., the anode sheet mentioned later), all stacked together. Multiple electrode structures are arranged corresponding to each electrode assembly. The tab portion 20 of the electrode structure includes a first tab and a second tab. The first tab corresponds to the cathode portion, and the second tab corresponds to the anode portion. The projections of the multiple first tabs and the multiple second tabs in a preset plane coincide. Specifically, by coinciding the projections of the multiple first tabs and the multiple second tabs in the preset plane, the wound cell portion 42 can achieve the same projection of the multiple tab portions 20 in the preset plane, thereby making it easier to arrange the busbar 44 and simplify the processing of the electrode structure.
[0034] [Battery Structure]
[0035] The battery structure in this application is a secondary battery, also known as a rechargeable battery or a storage battery, which refers to a battery that can be used again after being discharged by recharging to activate the active materials.
[0036] Typically, a secondary battery includes an electrode assembly, an electrolyte, and an outer casing. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The electrode assembly and electrolyte are assembled inside the outer casing. During charging and discharging, active ions (such as lithium ions) move back and forth between the positive and negative electrodes, inserting and extracting. The separator, positioned between the positive and negative electrodes, primarily prevents short circuits while allowing active ions to pass through. The electrolyte, located between the positive and negative electrodes, mainly serves to conduct active ions.
[0037] As an example, the preparation process of a secondary battery is as follows: the positive electrode, separator, and negative electrode are stacked in sequence, with the separator acting as a separator between the positive and negative electrodes. Then, the electrode assembly is obtained by winding or stacking (that is, the "wound cell" and "stacked cell" mentioned above). The electrode assembly is placed in an outer packaging shell, dried, and then injected with electrolyte. After vacuum sealing, settling, formation, and shaping, a secondary battery is obtained.
[0038] [Positive electrode tablets]
[0039] A positive electrode typically includes a positive current collector and a positive electrode film layer disposed on at least one side of the positive current collector. The positive electrode film layer includes a positive electrode active material, which can be any existing publicly disclosed positive electrode active material or a positive electrode active material optimized based on existing materials.
[0040] This application does not impose any particular restrictions on the type of positive electrode active material for the positive electrode sheet. As an example, the positive electrode active materials in this application include lithium-containing transition metal oxides (e.g., LiCoO2), phosphides (e.g., LiFePO4), or lithium intercalation compounds (e.g., positive electrode materials for binary lithium batteries such as lithium cobalt oxide and lithium nickel oxide, or positive electrode materials for ternary lithium batteries such as lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide).
[0041] In some embodiments, the positive electrode sheet can be prepared by dispersing the above-mentioned components for preparing the positive electrode sheet, such as positive electrode active material, conductive agent, binder and any other components, in a solvent (e.g., N-methylpyrrolidone) to form a positive electrode slurry; coating the positive electrode slurry onto the positive electrode current collector, and then obtaining the positive electrode sheet after drying, rolling, cutting and other processes.
[0042] In this application, the binder is used to improve the adhesion between positive electrode active material particles and the adhesion between the positive electrode active material and the current collector. This application does not impose any particular limitation on the type of binder for the positive electrode sheet; the binder can be any conventional choice in the battery industry. Specifically, the binder can be at least one of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyvinyl alcohol (PVA), styrene-butadiene rubber (SBR), polyacrylonitrile (PAN), polyimide (PI), polyacrylic acid (PAA), polyacrylate, polyolefin, sodium carboxymethyl cellulose (CMC), or sodium alginate.
[0043] This application does not impose any particular restrictions on the positive electrode current collector, as long as it is conductive and will not cause adverse chemical changes in the battery, and can be made of, for example: stainless steel, aluminum, nickel, titanium, sintered carbon; or aluminum or stainless steel that has been surface treated with one of carbon, nickel, titanium, silver, etc.
[0044] [Negative electrode plate]
[0045] The negative electrode includes a negative electrode current collector and a negative electrode active material layer disposed on at least one side of the negative electrode current collector. The negative electrode active material layer comprises a silicon-based material. This application does not specifically limit the type of silicon-based material; the silicon-based material can be a silicon-carbon material and / or a silicon-oxygen material. As an example, the silicon-based material can be one or more of silicon-carbon composite negative electrode materials, silicon suboxide negative electrode materials, modified silicon suboxide negative electrode materials, and nano-silicon materials. The negative electrode active material in the negative electrode active material layer may also optionally include one or more of artificial graphite, natural graphite, and hard carbon.
[0046] In some embodiments, the negative electrode sheet can be prepared by dispersing the components used to prepare the negative electrode sheet, such as the negative electrode active material, conductive agent, binder and any other components, in a solvent (e.g., water) to form a negative electrode slurry; coating the negative electrode slurry onto the negative electrode current collector, and then obtaining the negative electrode sheet after drying, rolling, cutting and other processes.
[0047] This application does not specifically limit the type of negative electrode conductive agent. In some embodiments, as an example, the negative electrode conductive agent can be one or more of conventional negative electrode conductive agents such as acetylene black and carbon nanotubes.
[0048] This application does not impose specific restrictions on the type of negative electrode binder. In some embodiments, as an example, the binder may be one or more of conventional negative electrode binders such as styrene-butadiene rubber latex (SBR), polyvinylidene fluoride (PVDF), polyacrylic acid (PAA), and sodium carboxymethyl cellulose (CMC). In this application, the binder is preferably PAA, SBR, and CMC, and the mass ratio of PAA, SBR, and CMC may be (34.38-74.29):(20-59.38):(5-7.14).
[0049] This application does not specifically limit the type of negative electrode current collector. In some embodiments, as an example, the negative electrode current collector can be one of the conventional negative electrode current collectors such as copper foil.
[0050] Electrolyte
[0051] The electrolyte acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. As an example, the electrolyte in this application can be any electrolyte suitable for electrochemical energy storage devices in the art. The electrolyte includes an electrolyte and a solvent; the electrolyte typically includes a lithium salt, and additives may also be added to the electrolyte.
[0052] Specifically, the lithium salt includes at least one selected from lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), lithium perchlorate (LiClO4), lithium hexafluoroarsenate (LiAsF6), lithium bis(fluorosulfonyl)imide (LiFSI), lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium trifluoromethanesulfonate (LiTFS), lithium difluorooxalate borate (LiDFOB), lithium dioxalate borate (LiBOB), lithium difluorophosphate (LiPO2F2), lithium difluorodioxalate phosphate (LiDFOP), and lithium tetrafluorooxalate phosphate (LiTFOP). The concentration of the electrolyte in the electrolyte solution can be 0.5–5 mol / L.
[0053] Specifically, the solvent includes at least one of ethylene carbonate (EC), propylene carbonate (PC), methyl ethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), butyl carbonate (BC), fluoroethylene carbonate (FEC), methyl formate (MF), methyl acetate (MA), ethyl acetate (EA), propyl acetate (PA), methyl propionate (MP), ethyl propionate (EP), propyl propionate (PP), methyl butyrate (MB), ethyl butyrate (EB), 1,4-butyrolactone (GBL), sulfolane (SF), dimethyl sulfone (MSM), methyl ethyl sulfone (EMS), and diethyl sulfone (ESE).
[0054] In some implementations, as an example, the additive may be a conventional electrolyte additive such as fluoroethylene carbonate (FEC), chloroethylene carbonate (CEC), or vinylene carbonate (VC).
[0055] [Septum]
[0056] In some embodiments, the secondary battery also includes a separator. This application does not impose any particular limitation on the type of separator; any known porous separator with good chemical and mechanical stability can be selected.
[0057] In some embodiments, as an example, the diaphragm can be one of PP, PE, or PP / PF; the diaphragm can also be a structure in which a coating is formed on the surface of the base film, wherein the base film coating can be one of PP, PE, or PP / PF, and the coating can be an inorganic coating and / or an organic coating. The inorganic coating can be selected from alumina ceramic layers, osmium silicate, etc., and the organic coating can be selected from PVDF, etc.
[0058] This application also provides an electrical device comprising multiple battery structures, wherein the battery structure is the aforementioned battery structure. The aforementioned battery structure effectively solves the problem of poor reliability of individual battery cells in related technologies, and the electrical device having the aforementioned battery structure also possesses the aforementioned advantages.
[0059] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.
[0060] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0061] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.
[0062] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A pole piece structure, characterized by, include: Body part(10); The tab (20) is connected to one end of the main body (10); The first insulating layer (31) and the second insulating layer (32) are disposed at the same end of the body portion (10) as the electrode tab (20), and are stacked on both sides of the electrode tab (20); wherein, The projection of the first insulating layer (31) onto the preset plane has a first area, and the projection of the second insulating layer (32) onto the preset plane has a second area. The first area is smaller than the second area, and the preset plane is perpendicular to the stacking direction of the first insulating layer (31), the tab (20), and the second insulating layer (32).
2. The pole piece structure of claim 1, wherein The ratio of the first area to the second area is greater than or equal to 0.3 and less than or equal to 0.
8.
3. The pole piece structure of claim 1, wherein The tab portion (20) has a sheet-like structure and a third area, wherein, The ratio of the first area to the third area is greater than or equal to 0.06 and less than or equal to 0.2; and / or, The ratio of the second area to the third area is greater than or equal to 0.075 and less than or equal to 0.
4.
4. The electrode structure according to claim 1, characterized in that, The height (H1) of the first insulating layer (31) is less than the height (H2) of the second insulating layer (32).
5. The electrode structure according to claim 1, characterized in that, The height (H1) of the first insulating layer (31) is greater than or equal to 1.5 mm and less than or equal to 4 mm; and / or, The height (H2) of the second insulating layer (32) is greater than or equal to 1.8 mm and less than or equal to 6 mm.
6. A battery structure, comprising an electrode structure, characterized in that, The electrode structure is the electrode structure according to any one of claims 1 to 5.
7. The battery structure according to claim 6, characterized in that, The battery structure also includes a housing (41), a cell (42), and terminals (43). The housing (41) has a receiving space (411). The cell (42) and the electrode structure are both disposed in the receiving space (411). The terminals (43) are disposed on the housing (41), and the electrode structure is connected between the terminals (43) and the cell (42).
8. The battery structure according to claim 7, characterized in that, There are multiple battery cells (42), each battery cell (42) is provided with the electrode structure, and the battery structure also includes a busbar (44) disposed in the receiving space (411), and the tab (20) of the electrode structure is connected to the terminal (43) through the busbar (44).
9. The battery structure according to claim 7, characterized in that, The battery cell (42) is a wound structure and has a winding axis. The first end of the battery cell (42) is close to the winding axis, and the second end of the battery cell (42) is far away from the winding axis. There are multiple tabs (20) of the electrode structure. The multiple tabs (20) are spaced apart from the first end to the second end of the battery cell (42). The spacing between two adjacent tabs (20) gradually increases in the direction from the first end to the second end of the battery cell (42) so that the projections of the multiple tabs (20) in the preset plane coincide.
10. The battery structure according to claim 7, characterized in that, The battery cell (42) includes multiple electrode assemblies stacked together. Each electrode assembly includes a cathode, a diaphragm, and an anode stacked together. The electrode structure is multiple and is arranged in a one-to-one correspondence with each of the multiple electrode assemblies. The tab (20) of the electrode structure includes a first tab and a second tab. The first tab is arranged corresponding to the cathode and the second tab is arranged corresponding to the anode. The projections of the multiple first tabs in the preset plane coincide, and the projections of the multiple second tabs in the preset plane coincide.
11. An electrical device comprising multiple battery structures, characterized in that, The battery structure is the battery structure according to any one of claims 6 to 10.