Pole piece structure and battery
By setting symmetrical semi-circular or semi-elliptical groove areas on both sides or multiple sides of the electrode sheet and connecting them with the electrode tabs, the problem of coating residue caused by the tolerance of the slitting machine is solved, and the production consistency of the electrode sheet is improved.
Patent Information
- Application Number
- CN202423264078.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In the production process, the tolerance of the slitting machine can cause deviations in the groove area of the electrode in the width direction, resulting in coating residue or reduction and affecting the quality of the electrode.
Symmetrical semicircular, semi-elliptical, or connected groove areas are set on both or multiple sides of the electrode to ensure that the groove area is connected to the electrode tab and reduce coating residue.
By providing symmetrical groove areas along the width of the electrode, the deviation problem caused by the tolerance of the slitting machine is solved, avoiding coating residue or reduction in the groove areas and improving the production consistency of the electrode.
Smart Images
Figure CN223771105U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of lithium-ion batteries, and in particular to an electrode structure and a battery. Background Technology
[0002] Existing electrode structures typically feature a rectangular groove in the middle of the electrode's length for welding the outer tab. Due to factors such as slitting machine tolerances during production, the actual rectangular groove is prone to deviation and fluctuation in the electrode's width. When the slitting line shifts upwards in the electrode's width direction, residual coating will remain above the groove in that direction. Conversely, when the slitting line shifts downwards, the width of the groove will decrease, causing fluctuations in the material area below the electrode. Utility Model Content
[0003] To solve the above-mentioned technical problems, this utility model proposes an electrode structure and a battery.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] In a first aspect, the present invention provides an electrode structure, including a foil and a material area coated with an active substance, wherein at least one side of the material area is provided with a groove area, and the groove area is connected to an electrode tab.
[0006] Furthermore, the number of slot areas is two, and the two slot areas are located on opposite sides of the foil. The two slot areas are semi-circular or semi-elliptical structures, and the arc surfaces of the two slot areas are arranged opposite each other.
[0007] Furthermore, a rectangular slot area is provided between the two semi-circular or semi-elliptical slot areas, and one of the semi-circular or semi-elliptical slot areas is connected to the other semi-circular or semi-elliptical slot area through the rectangular slot area.
[0008] Furthermore, the number of slot areas is two, and the two slot areas are located on opposite sides of the foil. One of the slot areas is a semi-circular or semi-elliptical structure, and the other slot area is a rectangular structure. The rectangular slot area is connected to the semi-circular or semi-elliptical slot area.
[0009] Furthermore, the number of slot areas is two, and the two slot areas are located on opposite sides of the foil. The two slot areas are rectangular in structure, and another rectangular slot area is provided between the two rectangular slot areas.
[0010] Furthermore, the number of slot areas is two, and the two slot areas are located on opposite sides of the foil. Both slot areas are rectangular in structure and are perpendicular to each other.
[0011] Secondly, this utility model provides a battery, which includes the electrode structure as described in any one of the above.
[0012] In summary, the beneficial effects of this utility model are as follows:
[0013] The electrode structure and battery of this utility model, by providing symmetrical semi-circular, semi-elliptical or connected groove areas in the width direction of the electrode, can solve the interference caused by factors such as the tolerance of the slitting machine. Even if the slitting machine fluctuates to one side or the other side, no coating will remain on both sides of the electrode set in the groove area. Attached Figure Description
[0014] Figure 1 A schematic diagram of the electrode structure in one embodiment;
[0015] Figure 2 A schematic diagram of the electrode structure in one embodiment;
[0016] Figure 3 A schematic diagram of the electrode structure in one embodiment;
[0017] Figure 4 A schematic diagram of the electrode structure in one embodiment;
[0018] Figure 5 A schematic diagram of the electrode structure in one embodiment;
[0019] Figure 6 A schematic diagram of the electrode structure according to one embodiment; and
[0020] Figure 7 This is a schematic diagram of the electrode structure according to one embodiment.
[0021] Attached Figure
[0022] Coating area 1, tank area 2. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0024] In a first aspect, the present invention provides an electrode structure, including a foil and a material area coated with an active substance, wherein at least one side of the material area is provided with a groove area 2, and the groove area is connected to an electrode tab.
[0025] In one embodiment, the number of slot areas is two, and the two slot areas are located on opposite sides of the foil. The two slot areas are semi-circular or semi-elliptical structures, and the arc surfaces of the two slot areas are arranged opposite each other.
[0026] In one embodiment, a rectangular slot area is provided between the two semi-circular or semi-elliptical slot areas, and one of the semi-circular or semi-elliptical slot areas is connected to the other semi-circular or semi-elliptical slot area through the rectangular slot area.
[0027] In one embodiment, two slot areas are provided on opposite sides of the foil. One slot area is a semi-circular or semi-elliptical structure, and the other slot area is a rectangular structure. The rectangular slot area is connected to the semi-circular or semi-elliptical slot area.
[0028] In one embodiment, the number of slot areas is two, the two slot areas are located on opposite sides of the foil, the two slot areas are rectangular, and another rectangular slot area is provided between the two rectangular slot areas.
[0029] In one embodiment, two slot areas are provided, located on opposite sides of the foil, both slot areas are rectangular in structure, and the two slot areas are perpendicular to each other.
[0030] In one embodiment, the foil is provided with a coating area 1, the coating area including a slurry coating and a primer coating component, the slurry coating and the primer coating including, but not limited to, lithium cobalt oxide slurry, lithium nickel cobalt manganese oxide slurry, lithium manganese oxide slurry, lithium nickel oxide slurry, lithium iron phosphate slurry, lithium manganese iron phosphate slurry, lithium-rich manganese-based slurry, graphite slurry, silicon carbon slurry, silicon oxide slurry, silicon slurry, soft carbon slurry, hard carbon slurry, polymer coating, ceramic coating, metal coating, metal oxide coating, solid electrolyte, etc.
[0031] Specifically, in one embodiment, a groove area is reserved in the electrode tab welding area of the electrode sheet. The groove area is two semi-circular structures or two semi-elliptical structures. The leftmost (or rightmost) position in the L2 direction of the electrode sheet is denoted as 0, and the rightmost (or leftmost) position in the L2 direction of the electrode sheet is denoted as L2. The range of the groove area in the central axis position in the L2 direction of the electrode sheet is 0.5*A1 (inclusive) to (L2-0.5*A1 (inclusive)).
[0032] For example, please see Figure 1 The electrode has a pre-reserved slot area in the electrode tab welding area. This slot area is designed as two semi-circular structures. L1 is the length of the electrode in the Y-axis direction of the plane coordinate system, L2 is the length of the electrode in the X-axis direction of the plane coordinate system, and A1 is the diameter of the semi-circle of the electrode slot area. Where 0 < A1 ≤ L1, 0 < A1 ≤ L2, L1 ≤ L2 or L2 ≤ L1, the center axis position of the slot area in the L2 direction of the electrode is 0.5 * L2, where 0 mm < A1 ≤ L1 = 2000 mm, L1 ≤ L2 or L2 ≤ L1.
[0033] For example, please see Figure 2 The electrode has a pre-reserved slot area in the electrode tab welding area. This slot area is designed as two semi-elliptical structures. L1 is the length of the electrode in the Y-axis direction of the plane coordinate system, L2 is the length of the electrode in the X-axis direction of the plane coordinate system, A2 is the diameter of the semi-ellipse in the L2 direction of the electrode, and A3 is the radius of the semi-ellipse in the L1 direction of the electrode, where 0 < 2 * A3 ≤ L1, 0 < A2 ≤ L2, L1 ≤ L2 or L2 ≤ L1.
[0034] For example, please see Figure 3 The electrode has a pre-reserved slot area in the electrode tab welding area. This slot area is also designed as two semi-elliptical structures. L1 is the length of the electrode in the Y-axis direction of the plane coordinate system, L2 is the length of the electrode in the X-axis direction of the plane coordinate system, A4 is the diameter of the semi-ellipse in the L2 direction of the electrode, and A5 is the radius of the semi-ellipse in the L1 direction of the electrode, where 0 < 2 * A5 ≤ L1, 0 < A4 ≤ L2, L1 ≤ L2 or L2 ≤ L1.
[0035] For example, please see Figure 4 The electrode tab welding area in the electrode sheet has a reserved slot area. The slot area is designed as a dumbbell-like structure, which consists of two semicircles (or semi-ellipses) and a rectangle. The leftmost (or rightmost) position in the L2 direction of the electrode sheet is denoted as 0, and the rightmost (or leftmost) position in the L2 direction of the electrode sheet is denoted as L2. The range of the slot area in the central axis position in the L2 direction of the electrode sheet is 0.5*B1 (inclusive) to (L2-0.5*B1 (inclusive)).
[0036] When the dumbbell-like structure slot area consists of two semicircles and a rectangle, L1 is the length of the electrode in the Y-axis direction of the plane coordinate system, L2 is the length of the electrode in the X-axis direction of the plane coordinate system, B1 is the diameter of the semicircle in the L2 direction of the electrode, B2 is the radius of the semicircle in the L1 direction of the electrode, C is the length of the rectangle in the L2 direction of the electrode, and D is the length of the rectangle in the L1 direction of the electrode, where B1=2*B2, 0<C<B1, 0<D<L1, 0<2*B2<L1, 0<B1<L2, and L1≤L2; when the dumbbell-like structure slot area consists of two semi-ellipses and a rectangle, B1≠2*B2, 0<C<B1, 0<D<L1, 0<2*B2<L1, 0<B1<L2, and L1≤L2 or L2≤L1.
[0037] For example, please see Figure 5 The electrode tab welding area in the electrode sheet has a reserved slot area. This slot area is designed as a flashlight-like structure, which consists of a semicircle (or semi-ellipse) and a rectangle. The leftmost (or rightmost) position in the L2 direction of the electrode sheet is denoted as 0, and the rightmost (or leftmost) position in the L2 direction of the electrode sheet is denoted as L2. The range of the slot area in the central axis position in the L2 direction of the electrode sheet is 0.5*E1 (inclusive) to (L2-0.5*E1 (inclusive)).
[0038] When the flashlight-like structure slot area consists of a semicircle and a rectangle, L1 is the length of the electrode in the Y-axis direction of the plane coordinate system, L2 is the length of the electrode in the X-axis direction of the plane coordinate system, E1 is the diameter of the semicircle in the L2 direction of the electrode, E2 is the radius of the semicircle in the L1 direction of the electrode, F is the length of the rectangle in the L2 direction of the electrode, and G is the length of the rectangle in the L1 direction of the electrode, where E1=2*E2, 0<F<E1, 0<G<L1, 0<E2<L1, 0<E1<L2, and L1≤L2; when the dumbbell-like structure slot area consists of two semi-ellipses and a rectangle, E1≠2*E2, 0<F<E1, 0<G<L1, 0<E2<L1, 0<E1<L2, and L1≤L2 or L2≤L1.
[0039] For example, please see Figure 6 The electrode tab welding area in the electrode sheet has a reserved slot area. This slot area is designed with an "I"-shaped structure, which consists of three rectangles. Figure 4The width L1 of the middle electrode is divided into three rectangles, denoted as rectangle 1, rectangle 2, and rectangle 3, from one end to the other. The leftmost (or rightmost) point in the direction of electrode L2 is denoted as 0, and the rightmost (or leftmost) point in the direction of electrode L2 is denoted as L2. The range of the central axis position of the slot area in the direction of electrode L2 is 0.5*H (inclusive) to (L2-0.5*H) (inclusive). L1 is the length of the electrode in the Y-axis direction of the plane coordinate system, L2 is the length of the electrode in the X-axis direction of the plane coordinate system, H is the length of rectangle 1 and rectangle 3 in the direction of electrode L2, I is the length of rectangle 2 in the direction of electrode L2, J is the length of rectangle 1 and rectangle 3 in the direction of electrode L1, and K is the length of rectangle 2 in the direction of electrode L1. Where L1 = 2*J + K, 0 < I < H, 0 < K < L1, 0 < H < L2, 0 < 2*J < L1, L1 ≤ L2, or L2 ≤ L1.
[0040] For example, please see Figure 7 The electrode tab welding area in the electrode sheet has a reserved slot area. This slot area is designed with a "T"-shaped structure, which consists of two rectangles. Figure 5 The width L1 of the middle electrode is divided into rectangle 1 and rectangle 2 from one end to the other. The leftmost (or rightmost) point in the direction of electrode L2 is denoted as 0, and the rightmost (or leftmost) point in the direction of electrode L2 is denoted as L2. The range of the central axis position of the slot area in the direction of electrode L2 is 0.5*M (inclusive) to (L2-0.5*M) (inclusive). L1 is the length of the electrode in the Y-axis direction of the plane coordinate system, L2 is the length of the electrode in the X-axis direction of the plane coordinate system, M is the length of rectangle 1 in the direction of electrode L2, N is the length of rectangle 2 in the direction of electrode L2, O is the length of rectangle 1 in the direction of electrode L1, and P is the length of rectangle 2 in the direction of electrode L1. Wherein, L1=O+P, 0<N<M, 0<P<L1, 0<M<L2, 0<O<L1, L1≤L2 or L2≤L1.
[0041] Secondly, this utility model also provides a battery, which includes any of the electrode structures described above.
[0042] The type of electrode structure is not limited. The electrode structure can be a single-sided coated electrode, a double-sided coated electrode, etc. In addition, the electrode structure can also be a positive electrode, a negative electrode, a foil base coating, etc.
[0043] The battery can be a lithium-ion battery, a sodium-ion battery, a potassium-ion battery, etc.
[0044] The foil material includes, but is not limited to, copper foil, aluminum foil, lithium foil (lithium metal, lithium alloy, etc.), composite current collector, etc.
[0045] The electrode structure and battery of this utility model have a pre-reserved slot area welded to the electrode tab in the center. The slot area can be two semicircles (or semi-ellipses), a dumbbell structure, a flashlight structure, an "I" shape, a "T" shape, etc. When the two slot areas are two semicircles (or semi-ellipses), they are composed of two semicircles (or semi-ellipses); when the two slot areas are dumbbell-like structures, they are composed of two semicircles (or semi-ellipses) and a rectangle; when the two slot areas are flashlight-like structures, they are composed of one semicircle (or semi-ellipse) and a rectangle; when the two slot areas are "I"-like structures, they are composed of three rectangles; when the two slot areas are "T"-like structures, they are composed of two mutually perpendicular rectangles.
[0046] The electrode structure and battery of this utility model, by providing symmetrical semi-circular, semi-elliptical or connected groove areas in the width direction of the electrode, can solve the interference caused by factors such as the tolerance of the slitting machine. Even if the slitting machine fluctuates to one side or the other side, no coating will remain on the groove areas on both sides of the electrode.
[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.
Claims
1. A pole piece structure, characterized by, The foil and the material area coated with active substance are included, at least one side of the material area is provided with a slot area, and the slot area is connected with the tab.
2. The pole piece structure of claim 1, wherein The number of the slot areas is two, and the two slot areas are arranged on opposite sides of the foil, and the two slot areas are semicircular or semi-elliptical structures, and the circular arc surfaces of the two slot areas are oppositely arranged.
3. The pole piece structure of claim 2, wherein The two semicircular or semi-elliptical slot areas are provided with a rectangular slot area, and one of the semicircular or semi-elliptical slot areas is communicated with the other semicircular or semi-elliptical slot area through the rectangular slot area.
4. The pole piece structure of claim 1, wherein, The number of the slot areas is two, and the two slot areas are arranged on opposite sides of the foil, and one of the slot areas is a semicircular or semi-elliptical structure, and the other slot area is a rectangular structure, and the rectangular slot area is communicated with the semicircular or semi-elliptical slot area.
5. The pole piece structure of claim 1, wherein, The number of the slot areas is two, and the two slot areas are arranged on opposite sides of the foil, and the two slot areas are rectangular structures, and another rectangular slot area is arranged between the two rectangular slot areas.
6. The pole piece structure of claim 1, wherein, The number of the slot areas is two, and the two slot areas are arranged on opposite sides of the foil, and the two slot areas are rectangular structures, and the two slot areas are perpendicular to each other.
7. A battery, characterized by The battery comprises the tab structure as claimed in any one of claims 1-6.