Lithium battery cap assembly and lithium battery
By introducing an insulating sheet and conductive adhesive layer into the lithium battery cap assembly, the explosion-proof sheet is isolated from the outside environment, solving the corrosion problem of the explosion-proof sheet and improving the safety and service life of the lithium battery.
Patent Information
- Application Number
- CN202423159675.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-19
AI Technical Summary
The explosion-proof diaphragm of the lithium battery cap assembly is prone to corrosion in high temperature and high humidity environments, which can cause foreign objects to enter the battery cell, reducing the safety and lifespan of the lithium battery.
An insulating sheet is introduced into the lithium battery cap assembly. The insulating sheet is located above the explosion-proof sheet and is connected to the conductive adhesive layer. It isolates the explosion-proof sheet from the outside world and avoids direct contact with high temperature and high humidity environments. Combined with the conductive adhesive layer, it ensures current conduction.
It improves the corrosion resistance of lithium batteries, enhances safety, and extends their service life.
Smart Images
Figure CN223728863U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to lithium battery technical field especially relates to a lithium battery cap assembly and lithium battery. BACKGROUND
[0002] Lithium battery cap assembly is one of important components of lithium battery, it has the function of positive electrode conductive terminal and the function of safety valve in lithium battery, simultaneously, lithium battery cap can also close to electric core to prevent the phenomenon of electrolyte leakage.
[0003] At present, the explosion -proof sheet in lithium battery cap assembly is directly contacted with outside environment, like this when lithium battery cap assembly is in high temperature and high humidity environment, easily causes the corrosion perforation of explosion -proof sheet, thereby leading to the foreign matter of outside into the inside of electric core of lithium battery, reduces the security of lithium battery, shortens the service life.
[0004] Therefore, it is urgent to design a lithium battery cap assembly and lithium battery to solve the above technical problems. INVENTION CONTENTS
[0005] The first purpose of the utility model is to provide a lithium battery cap assembly, improve the anticorrosion performance, improve the security of lithium battery, prolong the service life.
[0006] In order to achieve this purpose, the utility model adopts the following technical scheme:
[0007] The utility model provides a lithium battery cap assembly, which comprises:
[0008] A top cover and an explosion -proof sheet are provided.
[0009] A conductive adhesive layer is provided, and the top cover is connected with the explosion -proof sheet through the conductive adhesive layer.
[0010] An isolation sheet is provided between the top cover and the explosion -proof sheet, and the isolation sheet is located above the explosion -proof sheet, and the isolation sheet is configured to isolate the explosion -proof sheet from the outside.
[0011] As an optional technical scheme of the lithium battery cap assembly, the edge of the isolation sheet is connected with the conductive adhesive layer.
[0012] As an optional technical scheme of the lithium battery cap assembly, the overlapping area of the conductive adhesive layer and the isolation sheet accounts for 1 / 10 to 1 / 5 of the total area of the isolation sheet.
[0013] As an optional technical scheme of the lithium battery cap assembly, the radial length of the isolation sheet in contact with the conductive adhesive layer accounts for 1 / 4 to 1 / 2 of the length of the connection between the top cover and the conductive adhesive layer.
[0014] As an optional technical scheme of the lithium battery cap assembly, the conductive adhesive layer is epoxy resin.
[0015] As an optional technical scheme of the lithium battery cap assembly, the volume resistivity of the conductive adhesive layer is 10 -3 Ω·cm~10 -4 Ω·cm.
[0016] As an optional technical scheme of the lithium battery cap assembly, the isolation sheet is a plastic piece.
[0017] As an optional technical scheme of the lithium battery cap assembly, a plurality of notches or a notch is arranged on the isolation sheet.
[0018] As an optional technical scheme of the lithium battery cap assembly, the notches are annular, and the plurality of notches are concentrically arranged.
[0019] The second purpose of the utility model is to provide a lithium battery, which has high corrosion resistance, can improve the safety of the lithium battery, and prolong the service life.
[0020] To achieve this purpose, the utility model adopts the following technical scheme:
[0021] The utility model provides a lithium battery, the lithium battery includes a shell, a cell is received in the shell and the lithium battery cap assembly in any optional technical scheme above, one end of the shell is provided with an opening, and the lithium battery cap assembly is sealed in the opening.
[0022] The utility model has at least the following beneficial effects:
[0023] The utility model provides a lithium battery cap assembly, which comprises a top cover, an explosion-proof sheet, a conductive adhesive layer and an isolation sheet.
[0024] The conductive adhesive layer in the utility model is arranged at the connection between the top cover and the explosion-proof sheet. Meanwhile, the top cover and the explosion-proof sheet have a pressure relief space therebetween, and the top cover has a pressure relief hole in communication with the pressure relief space. In the prior art, the explosion-proof sheet directly contacts the high-temperature and high-humidity environment outside through the pressure relief hole. In the utility model, the isolation sheet is located above the explosion-proof sheet, and the isolation sheet completely covers the explosion-proof sheet in the pressure relief space, thereby achieving the purpose of isolating the explosion-proof sheet from the pressure relief hole in the top cover. The isolation sheet protects the explosion-proof sheet, avoids direct contact of the explosion-proof sheet with the high-temperature and high-humidity environment outside, reduces or avoids corrosion of the explosion-proof sheet by the high-temperature and high-humidity environment outside, improves the corrosion resistance of the lithium battery cap assembly, improves the safety of the lithium battery, and prolongs the service life.
[0025] The utility model provides a kind of lithium battery, which has high corrosion resistance, can improve the safety of lithium battery, and prolong the service life. BRIEF DESCRIPTION OF DRAWINGS
[0026] To more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings without creative labor.
[0027] Figure 1 is a sectional view of the lithium battery cap assembly provided by the embodiments of the utility model;
[0028] Figure 2 is Figure 1 an enlarged view of A in
[0029] REFERENCE NUMERALS
[0030] 100, top cover; 200, explosion-proof sheet; 300, conductive adhesive layer; 400, isolation sheet; 410, score; 500, hole plate; 510, insulating gasket; 600, sealing ring. DETAILED DESCRIPTION
[0031] To make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0032] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based upon the embodiments of the present application, all other embodiments that would be obvious to one of ordinary skill in the art based upon the present application are intended to be within the scope of the present application.
[0033] It should be noted that like reference numerals and letters refer to like items in the several views of the drawings, and as such, definitions and explanations of such items need not be repeated in the several views of the drawings.
[0034] In the description of the present application, it should be explained that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0035] In the description of the present application, it should also be explained that, unless otherwise explicitly specified and limited, the terms "provided", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0036] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "above", "upper" and "upper surface" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0037] 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.
[0038] This embodiment provides a lithium battery cap assembly, which improves the corrosion resistance of the lithium battery cap assembly, enhances the safety of the lithium battery, and extends its service life.
[0039] like Figures 1-2 As shown, the lithium battery cap assembly mainly includes a top cover 100, an explosion-proof sheet 200, a conductive adhesive layer 300, and a separator 400. The conductive adhesive layer 300 is disposed on the top cover 100 and / or the explosion-proof sheet 200, and the top cover 100 is connected to the explosion-proof sheet 200 through the conductive adhesive layer 300. The separator 400 is disposed between the top cover 100 and the explosion-proof sheet 200, and is located above the explosion-proof sheet 200, configured to isolate the explosion-proof sheet 200 from the external environment.
[0040] Based on the above design, in this embodiment, the conductive adhesive layer 300 is disposed on the top cover 100 and / or the explosion-proof sheet 200, thereby enabling the top cover 100 and the explosion-proof sheet 200 to be connected through the conductive adhesive layer 300 to ensure current conduction. That is, in this embodiment, the conductive adhesive layer 300 is disposed at the connection between the top cover 100 and the explosion-proof sheet 200. Simultaneously, since there is a pressure relief space between the top cover 100 and the explosion-proof sheet 200, and the top cover 100 has a pressure relief hole that communicates with the pressure relief space, in the prior art, the explosion-proof sheet directly contacts the external high-temperature and high-humidity environment through the pressure relief hole. In this embodiment, the isolation plate 400 is located above the explosion-proof plate 200, and the isolation plate 400 completely covers the explosion-proof plate 200 in the pressure relief space. This achieves the purpose of isolating the explosion-proof plate 200 from the pressure relief hole on the top cover 100. The isolation plate 400 protects the explosion-proof plate 200, preventing it from directly contacting the external high-temperature and high-humidity environment. This reduces or avoids the corrosion of the explosion-proof plate 200 by the external high-temperature and high-humidity environment, improves the corrosion resistance of the lithium battery cap assembly, enhances the safety of the lithium battery, and extends its service life.
[0041] Furthermore, in this embodiment, the edge of the insulating sheet 400 is connected to the conductive adhesive layer 300, which can improve the stability and reliability of the insulating sheet 400 and prevent misalignment and other defects in the insulating sheet 400.
[0042] Optionally, the conductive adhesive layer 300 in the embodiment overlaps the isolation sheet 400 by 1 / 10 to 1 / 5 of the total area of the isolation sheet 400. This not only ensures the stability and reliability of the adhesive connection between the conductive adhesive layer 300 and the isolation sheet 400, but also reduces the area of the isolation sheet 400 and saves costs. When the ratio is less than 1 / 10, the connection area between the edge of the isolation sheet 400 and the conductive adhesive layer 300 is too small, which reduces the stability of the fixed isolation sheet 400 and causes displacement of the isolation sheet 400 during later use, thereby reducing the corrosion resistance of the lithium battery cover assembly. When the ratio is greater than 1 / 5, the overlap area between the isolation sheet 400 and the conductive adhesive layer 300 is too large, thereby increasing the consumption of the isolation sheet 400 and increasing the cost.
[0043] Optionally, the radial length of the isolation sheet 400 in contact with the conductive adhesive layer 300 in the embodiment is 1 / 4 to 1 / 2 of the length of the top cover 100 connected to the conductive adhesive layer 300. The ratio can be set to 1 / 4, 1 / 3, 1 / 2, etc. to further improve the stability and reliability of the connection between the isolation sheet 400 and the conductive adhesive layer 300 and reduce or avoid the phenomenon that the isolation sheet 400 is misaligned and cannot completely cover the explosion-proof sheet 200 in the pressure relief space.
[0044] Optionally, the conductive adhesive layer 300 in the embodiment can be epoxy resin. The epoxy resin is applied in the form of glue on the top cover 100 and / or the explosion-proof sheet 200 by brushing, which is simple and efficient.
[0045] Epoxy resin includes various curing agents and modifiers. The prepared conductive adhesive layer 300 can be cured at a relatively low temperature, but its melting temperature is much higher than the curing temperature. The curing agent and modifier formula can be designed to meet the temperature requirements of the battery cell.
[0046] Optionally, the volume resistivity of the conductive adhesive layer 300 in the embodiment is 10 -3 Ω·cm to 10 -4 Ω·cm.
[0047] Optionally, the isolation sheet 400 in the embodiment is a plastic part, which is low in cost and easy to obtain.
[0048] Optionally, as shown in Figures 1-2 The isolation sheet 400 in the embodiment is provided with a plurality of notches 410 or a circle of notches 410. When the lithium battery is in thermal runaway, the notches 410 on the isolation sheet 400 can be broken by high-pressure gas after the explosion-proof sheet 200 is opened, or directly broken by the pressure inside the lithium battery, thereby improving safety and reducing the risk of thermal runaway.
[0049] Furthermore, in this embodiment, the notch 410 is annular, and multiple notches 410 are concentrically arranged. This ensures that the separator 400 can be opened in time when thermal runaway occurs in the lithium battery, facilitating pressure relief and improving the safety of the lithium battery.
[0050] like Figure 1 As shown, in this embodiment, the lithium battery cap assembly further includes a perforated plate 500, an insulating gasket 510, and a sealing ring 600. The perforated plate 500 is located below the explosion-proof sheet 200 and is welded to the explosion-proof sheet 200. Specifically, the connection can be made by ultrasonic welding. The perforated plate 500 is then laser-welded to the electrode tab of the battery cell to achieve the positive electrode lead-out of the lithium battery.
[0051] An insulating gasket 510 is disposed between the orifice plate 500 and the explosion-proof sheet 200. One side of the insulating gasket 510 abuts against the orifice plate 500, and the other side abuts against the explosion-proof sheet 200. The insulating gasket 510 prevents the orifice plate 500 and the explosion-proof sheet 200 from reconnecting after the cell CID is disconnected, which could lead to continued chemical reactions in the cell and cause a short circuit.
[0052] Alternatively, the insulating gasket 510 may be made of insulating materials such as plastic.
[0053] The sealing ring 600 covers part of the explosion-proof sheet 200, part of the top cover 100, and part of the perforated plate 500 to ensure the sealing performance of the lithium battery and extend its service life.
[0054] Optionally, the sealing ring 600 can be made of silicone.
[0055] This embodiment also provides a lithium battery, which includes a casing, a cell housed in the casing, and the aforementioned lithium battery cap assembly. One end of the casing has an opening, and the lithium battery cap assembly seals the opening.
[0056] Because this lithium battery has the aforementioned lithium battery cap assembly, it has high corrosion resistance, which improves the safety of the lithium battery and extends its service life.
[0057] Alternatively, the housing in this embodiment may be made of stainless steel.
[0058] Obviously, the above only preferred embodiments of the present application and the use of technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments here, those skilled in the art can make various obvious changes, re-adjustment and replacement without departing from the scope of the present application. Therefore, although the above embodiments of the present application has been described in more detail, but the present application is not limited to the above examples, without departing from the present application, the idea can also include more other equivalent embodiments, and the scope of the present application is determined by the appended claims.
[0059] Note that in the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
Claims
1. A lithium battery cap assembly, characterized by, The lithium battery cap assembly comprises: a top cover (100) and an explosion-proof sheet (200); a conductive adhesive layer (300), wherein the top cover (100) is connected with the explosion-proof sheet (200) through the conductive adhesive layer (300); an isolation sheet (400), wherein the isolation sheet (400) is arranged between the top cover (100) and the explosion-proof sheet (200), and the isolation sheet (400) is located above the explosion-proof sheet (200), and the isolation sheet (400) is configured to isolate the explosion-proof sheet (200) from the outside.
2. The lithium battery cap assembly of claim 1, wherein, The edge of the isolation sheet (400) is connected with the conductive adhesive layer (300).
3. The lithium battery cap assembly of claim 2, wherein, The overlapping area of the conductive adhesive layer (300) and the isolation sheet (400) accounts for 1 / 10-1 / 5 of the total area of the isolation sheet (400).
4. The lithium battery cap assembly of claim 2, wherein, The radial length of the isolation sheet (400) in contact with the conductive adhesive layer (300) accounts for 1 / 4-1 / 2 of the length of the top cover (100) connected with the conductive adhesive layer (300).
5. The lithium battery cap assembly of claim 1, wherein, The conductive adhesive layer (300) is epoxy resin.
6. The lithium battery cap assembly of claim 5, wherein, The bulk resistivity of the conductive adhesive layer (300) is 10 -3 Ω-cm~10 -4 Ω-cm.
7. The lithium battery cap assembly of claim 1, wherein, The isolation sheet (400) is a plastic part.
8. The lithium battery cap assembly of claim 7, wherein, A plurality of notches (410) or a circle of notches (410) are arranged on the isolation sheet (400).
9. The lithium battery cap assembly of claim 8, wherein, The notches (410) are annular, and a plurality of the notches (410) are concentrically arranged.
10. A lithium battery characterized by, The lithium battery comprises a shell, an electric core accommodated in the shell, and the lithium battery cap assembly of any one of claims 1-9, one end of the shell is provided with an opening, and the lithium battery cap assembly is sealed in the opening.