Laminated cover plate convenient to produce and lithium ion battery with laminated cover plate
By employing a negative electrode connecting plate through-hole design and PPTC conductive sheet in the lithium-ion battery laminate cover plate, the problems of production complexity and high cost are solved, achieving high yield and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU MICROBAT TECH CO LTD
- Filing Date
- 2025-04-22
- Publication Date
- 2026-05-19
AI Technical Summary
The existing production process for lithium-ion battery laminates is complex, and the requirements for making raised layers are high, resulting in high production costs and low yield.
The design employs a through-hole in the center of the negative electrode connector, with the positive electrode connector located on one side of the negative electrode connector. They are connected by an insulating layer and a conductive sheet made of PPTC, thereby increasing the thickness of the positive electrode connector and providing safety protection for the battery.
It reduces production difficulty, increases yield, saves production costs, and provides protection in case of battery short circuit or overheating, thus increasing battery safety.
Smart Images
Figure CN224264241U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of battery technology, specifically relating to lithium-ion batteries, and more particularly to a laminated cover plate that is easy to manufacture and a lithium-ion battery having the same. Background Technology
[0002] Currently, the laminated cover plates for button lithium-ion batteries on the market include positive electrode connecting pieces and negative electrode connecting pieces. Typically, the negative electrode connecting piece is annular, and its outer surface is connected to the battery casing. The positive electrode connecting piece is coaxial with the negative electrode connecting piece and is located at its lower end, with a certain overlap area between them. In order to facilitate the connection of the positive electrode connecting piece and make the upper surfaces of the positive electrode connecting piece and the negative electrode connecting piece flush, a raised layer is often made on the positive electrode connecting piece. However, the manufacturing requirements of the raised layer are high and the process is relatively complex. In order to solve this problem, a laminated cover plate that is easy to manufacture and a lithium-ion battery with it are proposed. Utility Model Content
[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.
[0004] Therefore, this utility model proposes a laminated cover plate that is easy to manufacture and a lithium-ion battery having the same. The easy-to-manufacture laminated cover plate has the advantages of low production cost and high yield.
[0005] According to an embodiment of the present invention, a laminated cover plate for easy production includes: a negative electrode connecting piece, a positive electrode connecting piece, an insulating layer, and a conductive sheet; the negative electrode connecting piece has a through hole in its center, and the outer peripheral surface of the negative electrode connecting piece is used to connect to the battery casing; the positive electrode connecting piece is smaller than the negative electrode connecting piece but larger than the through hole, the positive electrode connecting piece is disposed on one side of the negative electrode connecting piece, and the through hole is used to expose a portion of the positive electrode connecting piece; the insulating layer is located between the negative electrode connecting piece and the positive electrode connecting piece to insulate the negative electrode connecting piece and the positive electrode connecting piece; the conductive sheet is smaller than the through hole, the conductive sheet is connected to the positive electrode connecting piece, the conductive sheet is located inside the through hole, and the conductive sheet is used to ensure that the height of the positive electrode connecting piece is not lower than that of the negative electrode connecting piece.
[0006] According to one embodiment of the present invention, the positive electrode connecting piece is located inside the housing.
[0007] According to one embodiment of the present invention, the thickness of the conductive sheet is not less than the thickness of the negative electrode connecting sheet.
[0008] According to one embodiment of the present invention, the positive electrode connecting piece is located outside the housing.
[0009] According to one embodiment of the present invention, the conductive sheet is made of PPTC.
[0010] According to one embodiment of the present invention, the negative electrode connecting piece and the positive electrode connecting piece are bonded together by an insulating layer.
[0011] According to one embodiment of the present invention, the conductive sheet is welded to the positive electrode connecting sheet.
[0012] A lithium-ion battery includes a laminated cover plate that is easy to manufacture as described above, and the lithium-ion battery also includes a housing, wherein the negative electrode connecting piece is fixedly connected to the housing.
[0013] According to one embodiment of the present invention, the opening of the shell is circular, both the negative electrode connecting piece and the positive electrode connecting piece are circular, and the central axis of the negative electrode connecting piece is collinear with the central axis of the positive electrode connecting piece.
[0014] According to one embodiment of the present invention, the conductive sheet is circular, and the central axis of the conductive sheet is collinear with the central axis of the positive electrode connecting sheet.
[0015] The beneficial effects of this utility model are that it uses a conductive sheet to increase the thickness of the positive electrode connecting sheet, so that the conductive sheet and the positive electrode connecting sheet are connected. The conductive sheet and the positive electrode connecting sheet are respectively connected to the core inside the shell and the external product, avoiding the need to make a protrusion on the positive electrode connecting sheet, reducing the production difficulty, increasing the yield, and saving production costs.
[0016] Using PPTC as the conductive sheet, the material's internal resistance increases when heated, blocking current flow and protecting the battery in case of short circuits or overheating. Furthermore, since the negative and positive electrode connectors are bonded together only with an insulating layer, the pressure caused by internal vaporization during short circuits or overheating will separate the negative and positive electrode connectors, thus preventing battery explosion and further increasing battery safety.
[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention.
[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the following description of the embodiments with accompanying drawings, in which:
[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention when the positive electrode connecting piece is located inside the shell;
[0021] Figure 2This is a cross-sectional view of the overall structure of this utility model when the positive electrode connecting piece is located inside the shell;
[0022] Figure 3 This is a cross-sectional view of the overall structure of this utility model when the positive electrode connecting piece is located outside the shell;
[0023] Figure label:
[0024] 1. Negative electrode connecting piece; 11. Through hole; 2. Positive electrode connecting piece; 3. Housing; 4. Insulating layer; 5. Conductive sheet. Detailed Implementation
[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0028] The following describes in detail, with reference to the accompanying drawings, an easy-to-manufacture laminated cover plate and a lithium-ion battery having thereon, according to embodiments of the present invention.
[0029] like Figures 1-3As shown, the easily manufactured laminated cover plate according to an embodiment of the present invention includes: a negative electrode connecting piece 1, a positive electrode connecting piece 2, an insulating layer 4, and a conductive sheet 5; the negative electrode connecting piece 1 has a through hole 11 in its center, and the outer peripheral surface of the negative electrode connecting piece 1 is used to connect the battery casing 3; the positive electrode connecting piece 2 is smaller than the negative electrode connecting piece 1 and larger than the through hole 11, the positive electrode connecting piece 2 is disposed on one side of the negative electrode connecting piece 1, and the through hole 11 is used to expose part of the positive electrode connecting piece 2; the insulating layer 4 is located between the negative electrode connecting piece 1 and the positive electrode connecting piece 2 to insulate the negative electrode connecting piece 1 and the positive electrode connecting piece 2; the conductive sheet 5 is smaller than the through hole 11, the conductive sheet 5 is connected to the positive electrode connecting piece 2, the conductive sheet 5 is located inside the through hole 11, and the conductive sheet 5 is used to ensure that the height of the positive electrode connecting piece 2 is not lower than that of the negative electrode connecting piece 1.
[0030] In this embodiment, the conductive sheet 5 is used to increase the thickness of the positive electrode connecting piece 2, so that the conductive sheet 5 and the positive electrode connecting piece 2 are connected. The conductive sheet 5 and the positive electrode connecting piece 2 are respectively connected to the core inside the housing 3 and the external product. This avoids the need to make a protrusion on the positive electrode connecting piece 2, reduces the production difficulty, improves the yield, and saves production costs.
[0031] The positive electrode connector 2 is located inside the housing 3.
[0032] The thickness of the conductive sheet 5 is not less than the thickness of the negative electrode connecting sheet 1.
[0033] In this embodiment, the positive electrode connecting piece 2 is connected to the core inside the housing 3. By setting the thickness of the conductive piece 5 to be no less than the thickness of the negative electrode connecting piece 1, the conductive piece 5 is flush with or protrudes from the negative electrode connecting piece 1, thereby facilitating the connection of external products.
[0034] The positive electrode connector 2 is located outside the housing 3.
[0035] The conductive sheet 5 is made of PPTC.
[0036] The negative electrode connecting piece 1 and the positive electrode connecting piece 2 are bonded together by the insulating layer 4.
[0037] In this embodiment, the conductive sheet 5 is located inside the housing 3 and is connected to the core inside the housing 3. At this time, the positive electrode connecting piece 2 protrudes from the negative electrode connecting piece 1, which facilitates the connection of external products. At the same time, since the conductive sheet 5 is made of PPTC material, the material has the characteristic of increasing internal resistance when heated, which blocks the current flow and thus protects the battery when it is short-circuited or heated. In addition, since the negative electrode connecting piece 1 and the positive electrode connecting piece 2 are only bonded by the insulating layer 4, the pressure caused by the vaporization inside the battery when it is short-circuited or heated will separate the negative electrode connecting piece 1 and the positive electrode connecting piece 2, thereby achieving the effect of preventing battery explosion and further increasing the safety of the battery.
[0038] The conductive sheet 5 is welded to the positive electrode connecting piece 2 to ensure the strong connection between the conductive sheet 5 and the positive electrode connecting piece 2. This includes, but is not limited to, fixed connection methods such as reflow soldering, laser soldering, and tin soldering.
[0039] A lithium-ion battery includes any easily manufactured laminated cover plate, and the lithium-ion battery also includes a housing 3, with a negative electrode connecting piece 1 fixedly connected to the housing 3.
[0040] The opening of the shell 3 is circular, and both the negative electrode connecting piece 1 and the positive electrode connecting piece 2 are circular. The central axis of the negative electrode connecting piece 1 is collinear with the central axis of the positive electrode connecting piece 2.
[0041] The conductive sheet 5 is circular, and the central axis of the conductive sheet 5 is collinear with the central axis of the positive electrode connecting sheet 2.
[0042] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0043] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.
Claims
1. A laminated cover plate that is easy to manufacture, characterized in that, include: A negative electrode connecting piece (1) has a through hole (11) in the center, and the outer peripheral surface of the negative electrode connecting piece (1) is used to connect the battery casing (3); A positive electrode connecting piece (2) is smaller than the negative electrode connecting piece (1) and larger than the through hole (11). The positive electrode connecting piece (2) is located on one side of the negative electrode connecting piece (1). The through hole (11) is used to expose part of the positive electrode connecting piece (2). An insulating layer (4) is located between the negative electrode connecting piece (1) and the positive electrode connecting piece (2) to insulate the negative electrode connecting piece (1) and the positive electrode connecting piece (2); A conductive sheet (5) is smaller than the through hole (11). The conductive sheet (5) is connected to the positive electrode connecting piece (2). The conductive sheet (5) is located inside the through hole (11). The conductive sheet (5) is used to ensure that the height of the positive electrode connecting piece (2) is not lower than that of the negative electrode connecting piece (1).
2. The laminated cover plate that is easy to manufacture according to claim 1, characterized in that, The positive electrode connector (2) is located inside the housing (3).
3. The laminated cover plate that is easy to manufacture according to claim 2, characterized in that, The thickness of the conductive sheet (5) is not less than the thickness of the negative electrode connecting sheet (1).
4. The laminated cover plate that is easy to manufacture according to claim 1, characterized in that, The positive electrode connector (2) is located outside the housing (3).
5. The laminated cover plate that is easy to manufacture according to claim 4, characterized in that, The conductive sheet (5) is made of PPTC.
6. The laminated cover plate for easy production according to claim 5, characterized in that, The negative electrode connecting piece (1) and the positive electrode connecting piece (2) are bonded together by an insulating layer (4).
7. The laminated cover plate that is easy to manufacture according to claim 1, characterized in that, The conductive sheet (5) is welded to the positive electrode connecting sheet (2).
8. A lithium-ion battery, characterized in that, The lithium-ion battery includes a laminated cover plate that is easy to manufacture as described in any one of claims 1-7, and the lithium-ion battery also includes a housing (3), wherein the negative electrode connecting piece (1) is fixedly connected to the housing (3).
9. The lithium-ion battery according to claim 8, characterized in that, The opening of the shell (3) is circular, and both the negative electrode connecting piece (1) and the positive electrode connecting piece (2) are circular. The central axis of the negative electrode connecting piece (1) is collinear with the central axis of the positive electrode connecting piece (2).
10. The lithium-ion battery according to claim 9, characterized in that, The conductive sheet (5) is circular, and the central axis of the conductive sheet (5) is collinear with the central axis of the positive electrode connecting sheet (2).