Corrosion-resistant lithium-ion battery cover and battery with it

Abstract

This utility model discloses a corrosion-resistant lithium-ion battery cover and a battery having the same. The corrosion-resistant lithium-ion battery cover includes: a first connecting piece, a second connecting piece, a gel layer, and a corrosion-resistant layer. The first connecting piece and the second connecting piece are respectively used to connect the positive electrode and the negative electrode of the battery. The gel layer is located between the first connecting piece and the second connecting piece. The gel layer is used to connect the first connecting piece and the second connecting piece and to insulate the first connecting piece and the second connecting piece. The corrosion-resistant layer covers the exposed area of ​​the gel layer inside the casing and is used to prevent corrosion. This utility model has the advantages of ensuring corrosion resistance and improving the selectivity of the gel layer material.

Description

Technical Field

[0001] This utility model belongs to the field of battery structure technology, specifically relating to battery cover plates, and more particularly to a corrosion-resistant lithium-ion cover plate and a battery having the same. Background Technology

[0002] The cover plate of a button-type lithium-ion battery includes a first connecting piece and a second connecting piece, which are used to connect the positive and second pieces inside the battery, respectively. Compared to sealing with metal riveting and pressing with elastic sealing elements, the adhesive bonding method for sealing the first and second connecting pieces reduces the overall structural thickness requirement and saves space inside the battery casing. However, since the adhesive needs to be in contact with the electrolyte inside the battery for a long time, it has high requirements for its bulk strength, adhesion performance, coefficient of thermal expansion, and corrosion resistance. Currently, there are few adhesive materials that can meet all of these performance requirements, especially adhesion and corrosion resistance. Under the corrosion of the electrolyte, the adhesion performance of the adhesive will continuously decrease or even fail. To solve this problem, a corrosion-resistant lithium-ion cover plate and a battery incorporating 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 an anti-corrosion lithium-ion cover plate and a battery having the same, which has the advantages of ensuring anti-corrosion performance and improving the selectivity of the colloidal layer material.

[0005] According to an embodiment of the present invention, a corrosion-resistant lithium-ion battery cover plate includes: a first connecting piece, a second connecting piece, an colloid layer, and an anti-corrosion layer; the first connecting piece and the second connecting piece are respectively used to connect the positive electrode plate and the negative electrode plate of the battery; the colloid layer is located between the first connecting piece and the second connecting piece; the colloid layer is used to connect the first connecting piece and the second connecting piece and to insulate the first connecting piece and the second connecting piece; the anti-corrosion layer covers the exposed area of ​​the colloid layer within the casing and serves to prevent corrosion.

[0006] According to one embodiment of the present invention, the anti-corrosion layer further extends to a portion of the first connecting piece and the second connecting piece near the exposed area of ​​the colloidal layer within the housing.

[0007] According to one embodiment of the present invention, the thickness of the anti-corrosion layer is 0.01-0.1 mm.

[0008] According to one embodiment of the present invention, a through hole is formed on the first connecting piece along the thickness direction, the first connecting piece and the second connecting piece are arranged along the thickness direction, the through hole is used to expose a portion of the second connecting piece, the outer size of the second connecting piece is smaller than the outer size of the first connecting piece, so as to expose a portion of the first connecting piece.

[0009] According to one embodiment of the present invention, the through hole is located on or off the central axis of the first connecting piece.

[0010] According to one embodiment of the present invention, the second connecting piece has a protrusion formed along the thickness direction, the protrusion is located in the through hole, the protrusion and the through hole are spaced apart, and the upper surface of the protrusion is flush with the upper surface of the first connecting piece.

[0011] According to one embodiment of the present invention, the anti-corrosion layer is located in the area of ​​the outer surface of the second connecting piece or in the interval area between the through hole and the protrusion.

[0012] According to one embodiment of the present invention, both the first connecting piece and the second connecting piece are metal, and the thickness of the first connecting piece and the second connecting piece is 0.05-0.2 mm.

[0013] According to one embodiment of the present invention, the thickness of the colloidal layer is 0.02-0.1 mm.

[0014] A battery with a corrosion-resistant lithium-ion cover plate includes any of the corrosion-resistant lithium-ion cover plates described above, wherein the first connecting piece and the second connecting piece are fixed to one end of the housing.

[0015] The beneficial effects of this utility model are that by setting an anti-corrosion layer in the exposed area, the colloid layer is sealed, avoiding contact between the electrolyte and the colloid layer, thus maintaining the adhesive properties of the colloid layer; in addition, the setting of the anti-corrosion layer also reduces the requirement for the anti-corrosion performance of the colloid layer, thereby increasing the material selectivity of the colloid layer.

[0016] 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.

[0017] 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

[0018] 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:

[0019] Figure 1 This is a cross-sectional view of the overall structure of this utility model when the second connecting piece is located inside the shell;

[0020] Figure 2 This is a cross-sectional view of the overall structure of this utility model when the second connecting piece is located outside the shell;

[0021] Figure label:

[0022] 1. First connecting piece; 11. Through hole; 2. Colloidal layer; 3. Second connecting piece; 31. Protrusion; 4. Anti-corrosion layer; 5. Shell. Detailed Implementation

[0023] 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.

[0024] 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.

[0025] 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.

[0026] The following describes in detail, with reference to the accompanying drawings, an anti-corrosion lithium-ion cover plate and a battery having thereon, according to embodiments of the present invention.

[0027] like Figures 1-2As shown, the anti-corrosion lithium-ion cover plate according to an embodiment of the present invention includes: a first connecting piece 1, a second connecting piece 3, a colloidal layer 2, and an anti-corrosion layer 4; the first connecting piece 1 and the second connecting piece 3 are respectively used to connect the positive electrode plate and the negative electrode plate of the battery; the colloidal layer 2 is located between the first connecting piece 1 and the second connecting piece 3; the colloidal layer 2 is used to connect the first connecting piece 1 and the second connecting piece 3 and to insulate the first connecting piece 1 and the second connecting piece 3; the anti-corrosion layer 4 covers the exposed area of ​​the colloidal layer 2 located inside the shell 5 and is used to provide anti-corrosion protection.

[0028] In this embodiment, the first connecting piece 1 and the second connecting piece 3 can be connected to the positive electrode and the negative electrode as needed. That is, the first connecting piece 1 can be connected to either the positive electrode or the negative electrode. The side wall of the colloidal layer 2 inside the housing 5 is the exposed area. Furthermore, in order to ensure the strong connection between the colloidal layer 2 and the first connecting piece 1 and the second connecting piece 3, and to ensure the stability of the insulation of the first connecting piece 1 and the second connecting piece 3, the coverage area of ​​the colloidal layer 2 should be larger than the connection area of ​​the first connecting piece 1 and the second connecting piece 3. This part that is larger than the first connecting piece 1 and the second connecting piece 3 and is not connected to the first connecting piece 1 and the second connecting piece 3 is the exposed area. Since the electrolyte is only located inside the housing 5, it is only necessary to protect the exposed area inside the housing 5 from corrosion. By setting the anti-corrosion layer 4 in this exposed area, the colloidal layer 2 is sealed, avoiding contact between the electrolyte and the colloidal layer 2, thus maintaining the adhesive properties of the colloidal layer 2. In addition, the setting of the anti-corrosion layer 4 also reduces the requirement for the anti-corrosion performance of the colloidal layer 2, thereby increasing the material selectivity of the colloidal layer 2. Since the colloidal layer 2 and the anti-corrosion layer 4 are designed to meet specific performance requirements, the adhesive properties of the colloidal layer 2 are more reliable. At the same time, materials with higher adhesive properties can be selected, which ensures a strong connection while significantly reducing the thickness and coverage area of ​​the colloidal layer 2, and also reduces the size restrictions on the cover plate.

[0029] The anti-corrosion layer 4 also extends to a portion of the first connecting piece 1 and the second connecting piece 3 near the exposed area of ​​the colloidal layer 2 within the housing 5.

[0030] In other words, in addition to covering the exposed area of ​​the required colloidal layer 2, the anti-corrosion layer 4 also covers the first connecting piece 1 and the second connecting piece 3 connected to it. Therefore, when viewed from the connection edge between the anti-corrosion layer 4 and the colloidal layer 2, the electrolyte further ensures the sealing of the colloidal layer 2.

[0031] The thickness of the anti-corrosion layer 4 is 0.01-0.1 mm to ensure the isolation effect and avoid the phenomenon of electrolyte penetration into the anti-corrosion layer 4 due to the anti-corrosion layer 4 being too thin.

[0032] A through hole 11 is formed on the first connecting piece 1 along the thickness direction. The first connecting piece 1 and the second connecting piece 3 are arranged along the thickness direction. The through hole 11 is used to expose a portion of the second connecting piece 3. The outer dimension of the second connecting piece 3 is smaller than the outer dimension of the first connecting piece 1, so as to expose a portion of the first connecting piece 1. That is to say, if both the first connecting piece 1 and the second connecting piece 3 are circular, the diameter of the second connecting piece 3 is smaller than the diameter of the first connecting piece 1. In this case, the area of ​​the first connecting piece 1 protruding from the second connecting piece 3 can be used to connect the positive or negative electrode inside the battery.

[0033] In this embodiment, the edge of the first connecting piece 1 is fixedly connected to the housing 5. At this time, the second connecting piece 3 can be located between the housing 5 and the first connecting piece 1, that is, inside the housing 5, or it can be located above the first connecting piece 1, that is, outside the housing 5.

[0034] The through hole 11 is located on or off the central axis of the first connecting piece 1. If both the first connecting piece 1 and the second connecting piece 3 are circular, the first connecting piece 1 and the second connecting piece 3 can be arranged coaxially or off-axis to provide an area for welding the positive and negative electrodes to the tabs.

[0035] The second connecting piece 3 has a protrusion 31 formed along the thickness direction. The protrusion 31 is located inside the through hole 11 and is spaced from the through hole 11. The upper surface of the protrusion 31 is flush with the upper surface of the first connecting piece 1.

[0036] The anti-corrosion layer 4 is located on the outer surface of the second connecting piece 3 or in the space between the through hole 11 and the protrusion 31.

[0037] In other words, when the second connecting piece 3 is located inside the housing 5, the anti-corrosion layer 4 is located on the outer surface of the second connecting piece 3, that is, on the circumferential surface of the circular second connecting piece 3, the circumferential surface of the colloidal layer 2, and the area of ​​the first connecting piece 1 near the circumferential surface of the colloidal layer 2. When the second connecting piece 3 is located outside the housing 5, the anti-corrosion layer 4 is located in the gap between the through hole 11 and the protrusion 31. Preferably, the second connecting piece 3 is located outside the housing 5, and the anti-corrosion layer 4 is located in the gap between the through hole 11 and the protrusion 31, so that this gap has a limiting effect on the coated liquid, improving the coverage of the anti-corrosion layer 4 and avoiding incomplete coverage caused by liquid flow during the coating process.

[0038] In another embodiment, in addition to adding an anti-corrosion layer 4 to the exposed area of ​​the colloidal layer 2 inside the housing 5, an anti-corrosion layer 4 is also added to the exposed area outside the housing 5, so that the customer can choose the installation direction of the cover plate at will.

[0039] Both the first connecting piece 1 and the second connecting piece 3 are metal, and the thickness of the first connecting piece 1 and the second connecting piece 3 is 0.05-0.2 mm.

[0040] Specifically, the first connecting piece 1 and the second connecting piece 3 can both be made of metal materials such as stainless steel, carbon steel, and aluminum alloy; the protrusion 31 of the second connecting piece 3 includes, but is not limited to, a shell-like structure formed by bending or other means, or a solid structure added to the second connecting piece 3.

[0041] The thickness of the colloidal layer 2 is 0.02-0.1 mm. The material of the colloidal layer 2 is a structural adhesive for bonding metal materials, which is not limited by its anti-corrosion performance. The anti-corrosion layer 4 is a colloidal material resistant to electrolyte corrosion, which is not limited by its bonding strength to the metal, and can ensure a firm connection with the metal and prevent it from detaching.

[0042] A battery with a corrosion-resistant lithium-ion cover includes any one of the corrosion-resistant lithium-ion cover plates, and a first connecting piece 1 and a second connecting piece 3 are fixed to one end of a housing 5. The cover plate composed of the first connecting piece 1 and the second connecting piece 3 can be assembled with the front or the back of the housing 5.

[0043] 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.

[0044] 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 corrosion resistant lithium ion cover plate, characterized by, include: First connecting piece (1), second connecting piece (3), colloidal layer (2) and anti-corrosion layer (4); The first connecting piece (1) and the second connecting piece (3) are used to connect the positive electrode and the negative electrode of the battery, respectively. The colloidal layer (2) is located between the first connecting piece (1) and the second connecting piece (3). The colloidal layer (2) is used to connect the first connecting piece (1) and the second connecting piece (3) and to insulate the first connecting piece (1) and the second connecting piece (3). The anti-corrosion layer (4) covers the exposed area of ​​the colloidal layer (2) inside the shell (5) and is used to prevent corrosion.

2. The corrosion resistant lithium ion cover plate of claim 1, wherein, The anti-corrosion layer (4) also extends to a portion of the first connecting piece (1) and the second connecting piece (3) near the exposed area of ​​the colloidal layer (2) within the housing (5).

3. The corrosion resistant lithium ion cover plate of claim 2, wherein, The thickness of the anti-corrosion layer (4) is 0.01-0.1 mm.

4. The corrosion resistant lithium ion cover plate of claim 3, wherein, A through hole (11) is formed on the first connecting piece (1) along the thickness direction. The first connecting piece (1) and the second connecting piece (3) are arranged along the thickness direction. The through hole (11) is used to expose part of the second connecting piece (3). The outer size of the second connecting piece (3) is smaller than the outer size of the first connecting piece (1) so as to expose part of the first connecting piece (1).

5. The corrosion resistant lithium ion cover plate of claim 4, wherein, The through hole (11) is located on or off the central axis of the first connecting piece (1).

6. The corrosion resistant lithium ion cover plate of claim 5, wherein, The second connecting piece (3) has a protrusion (31) formed along the thickness direction. The protrusion (31) is located inside the through hole (11). The protrusion (31) and the through hole (11) are spaced apart. The upper surface of the protrusion (31) is flush with the upper surface of the first connecting piece (1).

7. The corrosion resistant lithium ion cover plate of claim 6, wherein, The anti-corrosion layer (4) is located on the outer surface of the second connecting piece (3) or in the space between the through hole (11) and the protrusion (31).

8. The corrosion resistant lithium ion cover plate of claim 7, wherein, The first connecting piece (1) and the second connecting piece (3) are both metal, and the thickness of the first connecting piece (1) and the second connecting piece (3) is 0.05-0.2 mm.

9. The corrosion resistant lithium ion cover plate of claim 8, wherein, The thickness of the colloidal layer (2) is 0.02-0.1 mm.

10. A battery with a corrosion-resistant lithium-ion cover plate, comprising the corrosion-resistant lithium-ion cover plate as described in any one of claims 1-9, characterized in that, The first connecting piece (1) and the second connecting piece (3) are fixed to one end of the housing (5).

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