Battery monomer and electric equipment
By designing alternating positive and negative electrode regions in the battery cell to form an internal series circuit, the problem of large workload in solid-state battery assembly is solved, achieving high voltage output and high energy density, making it suitable for mass production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-08
AI Technical Summary
In existing technologies, the internal series connection process of solid-state batteries increases the workload of battery assembly, making it difficult to apply to large-scale industrial production.
The battery cell design incorporates alternating positive, negative, and spacer regions on the electrodes. The alternating design of the positive and negative regions on the electrodes forms an internal series circuit, eliminating the need for external wire connections and achieving high voltage output and high energy density.
It achieves high voltage output and higher energy density, making it suitable for large-scale industrial production and simplifying the battery assembly process.
Smart Images
Figure CN224217507U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and an electrical device. Background Technology
[0002] With the development of battery technology, solid-state batteries are a type of battery that uses solid electrodes and solid electrolytes. They have the characteristics of high safety, high energy density and long service life, making them an ideal replacement for traditional lithium-ion batteries.
[0003] In existing technologies, multiple batteries can generally be connected in series using electrical connectors, but this process increases the workload of battery assembly. Utility Model Content
[0004] The technical problem to be solved by this invention is: how to realize the internal series connection of solid-state battery cells so as to be suitable for mass industrial production.
[0005] To solve the above-mentioned technical problems, this utility model provides a technical solution for a single battery cell:
[0006] A battery cell includes a first electrode, a second electrode, and an insulating layer disposed between the first electrode and the second electrode. The first electrode and the second electrode each have a first direction and a second direction that are perpendicular to each other.
[0007] The first electrode includes a first current collector, a first positive electrode region and a first negative electrode region disposed on at least one side surface of the first current collector, the first positive electrode region and the first negative electrode region being spaced apart along the first direction, and a first gap region being provided between the first positive electrode region and the first negative electrode region;
[0008] The second electrode includes a second current collector, a second positive electrode region and a second negative electrode region disposed on at least the same side surface of the second current collector, the second positive electrode region and the second negative electrode region being spaced apart along the first direction, and a second gap region being provided between the second positive electrode region and the second negative electrode region;
[0009] Along the direction in which the first electrode and the second electrode are stacked, the first positive electrode region and the second negative electrode region are arranged facing each other, the first negative electrode region and the second positive electrode region are arranged facing each other, and the first spacing region and the second spacing region are arranged opposite each other.
[0010] Furthermore, the isolation layer includes a solid electrolyte layer or a gel electrolyte layer.
[0011] Furthermore, the isolation layer includes a first sub-isolation layer and a second sub-isolation layer spaced apart, wherein the first sub-isolation layer is located between the first positive electrode region and the second negative electrode region, and the second sub-isolation layer is located between the first negative electrode region and the second positive electrode region.
[0012] Furthermore, the isolation layer comprises at least two layers arranged along the direction in which the first electrode and the second electrode are stacked.
[0013] Furthermore, the edge of the first current collector is provided with a first tab region, and the edge of the second current collector is provided with a second tab region. The first tab region protrudes from the second electrode plate along the first direction, and the second tab region protrudes from the first electrode plate along the first direction.
[0014] Furthermore, the first interval region and / or the second interval region are provided with insulating elements.
[0015] Furthermore, the insulating element includes a first insulating layer disposed on the surface of the first current collector and located in the first interval region;
[0016] And / or, the insulating element includes a second insulating layer disposed on the surface of the second current collector and located in the second spacer region; and / or, the insulating element includes a third insulating layer filled between the first spacer region and the second spacer region.
[0017] Furthermore, the third insulating layer has an elastic structure;
[0018] And / or, the isolation layer includes a solid electrolyte layer, and the third insulating layer abuts against the solid electrolyte layer.
[0019] Furthermore, the battery cell is a wound battery cell, and the lengths of the first electrode and the second electrode in the first direction are less than the lengths of the first electrode and the second electrode in the second direction. The first electrode and the second electrode are wound from the second direction to form the wound battery cell.
[0020] Compared with the prior art, the advantages of this battery cell and electrical device are as follows: the battery cell includes a battery cell with a first electrode and a second electrode structure. The first electrode includes a first current collector, a first positive electrode region and a first negative electrode region disposed on at least one side surface of the first current collector, and a first gap region between the first positive electrode region and the first negative electrode region. Correspondingly, the second electrode includes a second current collector, a second positive electrode region and a second negative electrode region disposed on at least one side surface of the second current collector, and a second gap region between the second positive electrode region and the second negative electrode region.
[0021] After the first and second electrodes are positioned opposite each other, the first positive electrode region of the first electrode and the second negative electrode region of the second electrode face each other, and the first negative electrode region of the first electrode and the second positive electrode region of the second electrode face each other. This facing arrangement means they are arranged face-to-face, with the first and second spacer regions facing each other. The alternating design of the positive and negative electrode regions creates multiple repeating units, allowing the positive and negative electrode regions of adjacent layers to be electrically connected, forming an internal series circuit. More importantly, this internal series structure eliminates the need for external wire connections, thus achieving high voltage output and higher energy density, making it suitable for mass industrial production. Attached Figure Description
[0022] Figure 1 This is a planar unfolded view of the first electrode sheet in an embodiment of this utility model;
[0023] Figure 2 This is a planar unfolded view of the second pole piece in an embodiment of this utility model;
[0024] Figure 3 This is a schematic diagram of the assembly of the first electrode and the second electrode in an embodiment of this utility model;
[0025] Figure 4 This is a planar unfolded view of the first electrode with a solid electrolyte layer in an embodiment of this utility model;
[0026] Figure 5 This is a plan view of the first electrode with a gel-state electrolyte layer in another embodiment of this utility model;
[0027] Figure 6 This is a plan view of the first electrode with an isolation layer in another embodiment of this utility model;
[0028] Figure 7 yes Figure 6 A cross-sectional schematic diagram of the cell in the first direction;
[0029] Figure 8 This is a cross-sectional schematic diagram of the battery cell in the first direction in another embodiment three of this utility model;
[0030] In the figure: 1-First electrode, 10-First current collector, 11-First positive electrode region, 12-First negative electrode region, 13-First spacer region, 14-First tab region, 2-Second electrode, 20-Second current collector, 21-Second positive electrode region, 22-Second negative electrode region, 23-Second spacer region, 24-Second tab region, 3-Insulating layer, 31-Solid electrolyte layer, 32-Gel electrolyte layer, 33-First sub-insulating layer, 34-Second sub-insulating layer, 4-Insulating component, 41-First insulating layer, 42-Second insulating layer, 43-Third insulating layer, 5-Cell, X-First direction, Y-Second direction, Z-Thickness direction. Detailed Implementation
[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0035] like Figures 1 to 4 As shown, a battery cell according to an embodiment of the present invention includes a cell 5, a first electrode 1, a second electrode 2, and an isolation layer 3 disposed between the first electrode 1 and the second electrode 2. The first electrode 1 and the second electrode 2 each have a first direction X and a second direction Y that are perpendicular to each other. The first electrode 1 includes a first current collector 10, a first positive electrode region 11 and a first negative electrode region 12 disposed on at least one side surface of the first current collector 10. The first positive electrode region 11 and the first negative electrode region 12 are spaced apart along the first direction X, and a first gap region 13 is provided between the first positive electrode region 11 and the first negative electrode region 12.
[0036] The second electrode 2 includes a second current collector 20, a second positive electrode region 21 and a second negative electrode region 22 disposed on at least one side surface of the second current collector 20, the second positive electrode region 21 and the second negative electrode region 22 are spaced apart along a first direction X, and a second gap region 23 is provided between the second positive electrode region 21 and the second negative electrode region 22; along the stacking direction of the first electrode 1 and the second electrode 2, the first positive electrode region 11 and the second negative electrode region 22 are arranged facing each other, the first negative electrode region 12 and the second positive electrode region 21 are arranged facing each other, and the first gap region 13 and the second gap region 23 are arranged opposite each other.
[0037] The battery cell adopts a structural design of a first electrode 1 and a second electrode 2. The first electrode 1 includes a first current collector 10, a first positive electrode region 11 and a first negative electrode region 12 disposed on at least one side surface of the first current collector 10, and a first gap region 13 between the first positive electrode region 11 and the first negative electrode region 12. Correspondingly, the second electrode 2 includes a second current collector 20, a second positive electrode region 21 and a second negative electrode region 22 disposed on at least one side surface of the second current collector 20, and a second gap region 23 between the second positive electrode region 21 and the second negative electrode region 22.
[0038] After the first electrode 1 and the second electrode 2 are positioned opposite each other, the first positive electrode region 11 of the first electrode 1 and the second negative electrode region 21 of the second electrode 2 are arranged facing each other, and the first negative electrode region 12 of the first electrode 1 and the second positive electrode region 22 of the second electrode 2 are arranged facing each other. This facing arrangement means they are arranged face-to-face. The first spacing region 13 and the second spacing region 23 are opposite each other. Multiple repeating units are formed by the alternating design of the positive and negative electrode regions of the electrodes, allowing the positive and negative electrode regions of adjacent layers to be electrically connected, forming an internal series circuit. More importantly, the internal series structure of the battery cell eliminates the need for external wire connections, thereby achieving high voltage output and higher energy density, making it suitable for mass industrial production.
[0039] In one embodiment, the insulating layer 3 includes a solid electrolyte layer 31. The solid electrolyte layer 31 can be coated on the surfaces of the first positive electrode region 11 and the first negative electrode region 12 of the first electrode 1, and on the surfaces of the second positive electrode region 21 and the second negative electrode region 22 of the second electrode 2, with a coating thickness ranging from 3 mm to 30 mm. The solid electrolyte layer 31 includes two or more mixed components, thereby maintaining high ionic conductivity while maintaining a certain degree of flexibility to meet the requirements of winding processing. Specifically, the weight ratio of the components of the solid electrolyte layer 31 is: 0-50% polymer, 10%-80% sulfide, 10%-80% oxide, and 10%-80% halide.
[0040] It should be noted that the stacking direction of the first electrode 1 and the second electrode 2 refers to the thickness direction Z of the first electrode 1 and / or the second electrode 2, and the thickness direction Z of the first electrode 1 and / or the second electrode 2 is perpendicular to both the first direction X and the second direction Y. In one embodiment, as... Figure 3 As shown, the battery cell is a structure formed by alternately stacking and winding a first electrode 1 and a second electrode 2. The stacking can be two layers, four layers, or other even numbers of layers. Alternatively, in other embodiments, the battery cell is a laminated structure.
[0041] After the first electrode 1 and the second electrode 2 are positioned opposite each other and wound together, multiple repeating units are formed through the alternating positive and negative electrode regions and the stacked winding design. This allows the positive and negative electrode regions of adjacent layers to be electrically connected, forming an internal series circuit. The current path is low-resistance, transmitting along the winding direction. More importantly, the voltage of the battery cell in the internal series structure is related to the number of winding layers, eliminating the need for external wire connections. This achieves high voltage output and higher energy density, making it suitable for mass industrial production.
[0042] Compared to the low production efficiency of stacked structures, the internal series connection of wound solid-state batteries is more suitable for mass industrial production.
[0043] In one embodiment, the isolation layer 3 includes at least two layers arranged along the stacking direction of the first electrode 1 and the second electrode 2. For example, one isolation layer 3 is connected to the positive electrode region and another isolation layer 3 is connected to the negative electrode region, which helps to effectively connect the isolation layer 3 with the positive and negative electrode regions and improves the effective transport of ions.
[0044] To meet different usage needs, other embodiments of this utility model are provided, such as... Figure 5 As shown, the isolation layer 3 includes a gel electrolyte layer 32, which is an electrolyte material between liquid and solid states. It is usually composed of a polymer matrix, an electrolyte salt and a small amount of organic solvent. It uses a polymer as a skeleton to form interconnected pores. After absorbing the electrolyte solution, it forms an expanded gel phase in which lithium ions (or other ions) are transported.
[0045] In addition, in some embodiments, aluminum foil is used as the current collector for sodium-ion solid-state batteries, while lithium-ion batteries require a specially treated composite current collector, and copper foil and aluminum foil regions are sputtered on a polymer layer to form positive and negative electrode regions.
[0046] Other embodiments of this utility model, such as Figure 6 , Figure 7As shown, the isolation layer 3 includes a first sub-isolation layer 33 and a second sub-isolation layer 34 spaced apart. The first sub-isolation layer 33 is located between the first positive electrode region 11 and the second negative electrode region 22, and the second sub-isolation layer 34 is located between the first negative electrode region 12 and the second positive electrode region 21. The first sub-isolation layer 33 and the second sub-isolation layer 34 effectively separate and facilitate ion conduction between the first positive electrode region 11 of the first electrode 1 and the second negative electrode region 22 of the second electrode 2, and between the first negative electrode region 12 of the first electrode 1 and the second positive electrode region 21 of the second electrode 2.
[0047] In one embodiment, such as Figure 7 As shown, the edge of the first current collector 10 is provided with a first tab region 14, and the edge of the second current collector 20 is provided with a second tab region 24. The first tab region 14 protrudes from the second electrode 2 along the first direction X, and the second tab region 24 protrudes from the first electrode 1 along the first direction X. By the protruding arrangement of the first tab region 14 and the second tab region 24, the purpose of current extraction and connection between the first electrode 1 and the second electrode 2 is achieved.
[0048] For the spacing regions of the electrode plates, electronic insulation is required. In one embodiment, the first spacing region 13 and / or the second spacing region 23 are provided with an insulating element 4. In another embodiment, the insulating element 4 includes a third insulating layer 43 filled between the first spacing region 13 and the second spacing region 23.
[0049] It should be noted that, in one embodiment, the third insulating layer 43 can be an elastic structure. The elastic third insulating layer 43 helps to alleviate the expansion of the cell during charging and discharging, improve the contact tightness between the positive and negative electrodes and the isolation layer 3, reduce the interface impedance, and improve the cell performance.
[0050] In another embodiment, the insulating layer 3 includes a solid electrolyte layer 31, and a third insulating layer 43 abuts against the solid electrolyte layer 31 to limit its position. For example, in a wound battery cell, the solid electrolyte layer 31 can be reliably limited by the compression of the solid electrolyte layer 31 by the third insulating layer 43, thereby reducing the risk of peeling and cracking of the solid electrolyte.
[0051] like Figure 8As shown, the first spacer region 13 and / or the second spacer region 23 are provided with an insulating element 4. In one embodiment, the insulating element 4 includes a first insulating layer 41 disposed on the surface of the first current collector 10 and located in the first spacer region 13; in another embodiment, the insulating element 4 includes a second insulating layer 42 disposed on the surface of the second current collector 20 and located in the second spacer region 23. In yet another embodiment, the insulating layer 3 includes a solid electrolyte layer 31, the first insulating layer 41 and the second insulating layer 42 are bonded together and fill the first spacer region 13 and the second spacer region 23 between the two electrodes, and can compress the solid electrolyte layer 31 to reliably limit the solid electrolyte layer 31, thereby reducing the risk of peeling and cracking of the solid electrolyte.
[0052] In this embodiment, the battery cell 5 is a wound battery cell. The lengths of the first electrode 1 and the second electrode 2 in the first direction X are less than the lengths of the first electrode 1 and the second electrode 2 in the second direction Y. The first electrode 1 and the second electrode 2 are wound from the second direction Y to form a wound battery cell. In other words, the first electrode 1 and the second electrode 2 are strip-shaped. The first electrode 1 and the second electrode 2 are stacked and wound along the extension direction of the strip, i.e., the second direction Y, to form a wound battery cell.
[0053] The specific embodiments of the electrical equipment of this utility model include battery cells, which are the same as the specific embodiments of the battery cells in the above-described embodiments, and will not be repeated here.
[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A battery cell, characterized in that, The battery cell (5) includes a first electrode (1), a second electrode (2), and an isolation layer (3) disposed between the first electrode (1) and the second electrode (2). The first electrode (1) and the second electrode (2) each have a first direction (X) and a second direction (Y) that are perpendicular to each other. The first electrode (1) includes a first current collector (10), a first positive electrode region (11) and a first negative electrode region (12) disposed on at least one side surface of the first current collector (10), the first positive electrode region (11) and the first negative electrode region (12) are spaced apart along the first direction (X), and a first gap region (13) is provided between the first positive electrode region (11) and the first negative electrode region (12); The second electrode (2) includes a second current collector (20), a second positive electrode region (21) and a second negative electrode region (22) disposed on at least one side surface of the second current collector (20), the second positive electrode region (21) and the second negative electrode region (22) are spaced apart along the first direction (X), and a second gap region (23) is provided between the second positive electrode region (21) and the second negative electrode region (22); Along the stacking direction of the first electrode (1) and the second electrode (2), the first positive electrode region (11) and the second negative electrode region (22) are arranged facing each other, the first negative electrode region (12) and the second positive electrode region (21) are arranged facing each other, and the first interval region (13) and the second interval region (23) are arranged opposite each other.
2. The battery cell according to claim 1, characterized in that, The isolation layer (3) includes a solid electrolyte layer (31) or a gel electrolyte layer (32).
3. The battery cell according to claim 1 or 2, characterized in that, The isolation layer (3) includes a first sub-isolation layer (33) and a second sub-isolation layer (34) spaced apart. The first sub-isolation layer (33) is located between the first positive electrode region (11) and the second negative electrode region (22), and the second sub-isolation layer (34) is located between the first negative electrode region (12) and the second positive electrode region (21).
4. The battery cell according to claim 1 or 2, characterized in that, The isolation layer (3) includes at least two layers arranged along the direction of the stacking of the first electrode (1) and the second electrode (2).
5. The battery cell according to claim 1 or 2, characterized in that, The first current collector (10) has a first tab region (14) at its edge, and the second current collector (20) has a second tab region (24) at its edge. The first tab region (14) protrudes from the second electrode plate (2) along the first direction (X), and the second tab region (24) protrudes from the first electrode plate (1) along the first direction (X).
6. The battery cell according to claim 1 or 2, characterized in that, The first interval (13) and / or the second interval (23) are provided with an insulating element (4).
7. The battery cell according to claim 6, characterized in that, The insulating element (4) includes a first insulating layer (41) disposed on the surface of the first current collector (10) and located in the first spacer region (13); And / or, the insulating element (4) includes a second insulating layer (42) disposed on the surface of the second current collector (20) and located in the second spacer region (23); And / or, the insulating element (4) includes a third insulating layer (43) filled between the first spacer region (13) and the second spacer region (23).
8. The battery cell according to claim 7, characterized in that, The third insulating layer (43) is an elastic structure; And / or, the isolation layer (3) includes a solid electrolyte layer (31), and the third insulating layer (43) abuts against the solid electrolyte layer (31).
9. The battery cell according to claim 1 or 2, characterized in that, The cell (5) is a wound cell. The lengths of the first electrode (1) and the second electrode (2) in the first direction (X) are less than the lengths of the first electrode (1) and the second electrode (2) in the second direction (Y). The first electrode (1) and the second electrode (2) are wound from the second direction (Y) to form the wound cell.
10. An electrical appliance, characterized in that, Includes the battery cell as described in claim 9.