Cover plate, shell assembly and battery

Abstract

The utility model discloses a cover plate, shell assembly and battery, the cover plate comprises a first cover body, a first insulating layer and a second cover body, the first cover body, the first insulating layer and the second cover body are laminated; the first insulating layer comprises a first adhesive layer, a second adhesive layer and a high-temperature-resistant layer, the first adhesive layer and the second adhesive layer are arranged on the two sides of the high-temperature-resistant layer respectively, the first cover body is connected with the first adhesive layer, and the second cover body is connected with the second adhesive layer. According to the utility model, since the first insulating layer is formed by compounding the first adhesive layer, the second adhesive layer and the high-temperature-resistant layer, the first adhesive layer and the second adhesive layer which are positioned on the two sides of the high-temperature-resistant layer are respectively adhered to the first cover body and the second cover body during hot-pressing compounding, and the high-temperature-resistant layer can resist high temperature during hot-pressing compounding; the conduction short circuit of the first cover body and the second cover body is avoided, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, and in particular to a cover plate, a shell assembly and a battery. Background Art

[0002] In existing steel shell button batteries, the cover plate is mostly made of three pieces, that is, two polar layers are hot-pressed and laminated through a glue layer in the middle. In practical applications, if the glue layer is thin or the hot-pressing and laminating time is long, the glue layer is easily squeezed and flowed during the laminating process, resulting in a short circuit between the two polar layers, affecting the safety performance of the battery. Utility Model Content

[0003] The embodiments of the utility model provide a cover plate, a shell assembly and a battery to solve the problem that the adhesive layer is easily heated, squeezed and flowed during the compounding process, resulting in contact and short circuit between two polar layers.

[0004] Specifically, the utility model provides a cover plate, characterized in that it includes a first cover body, a first insulating layer and a second cover body, and the first cover body, the first insulating layer and the second cover body are stacked; the first insulating layer includes a first adhesive layer, a second adhesive layer and a high-temperature resistant layer, the first adhesive layer and the second adhesive layer are respectively arranged on both sides of the high-temperature resistant layer, and the first cover body is connected to the first adhesive layer, and the second cover body is connected to the second adhesive layer.

[0005] Optionally, the inner edge of the first adhesive layer is connected to the inner edge of the second adhesive layer, and the outer edge of the first adhesive layer is connected to the outer edge of the second adhesive layer.

[0006] Optionally, the high temperature resistant layer is a polymer layer or a metal layer.

[0007] Optionally, the thickness of the high temperature resistant layer is 5-30 μm.

[0008] Optionally, a through hole is provided on the first cover body, a protrusion is provided on the second cover body, and the protrusion is located in the through hole; the inner edge of the first insulating layer extends between the protrusion and the inner wall of the through hole.

[0009] Optionally, the cover plate further includes a second insulating layer, and the second insulating layer is arranged on a side of the first cover body away from the first insulating layer.

[0010] Optionally, the second insulating layer includes one of adhesive tape, film and ceramic sheet.

[0011] The utility model also provides a shell assembly, characterized in that it includes a shell body and a cover plate as described in any one of the above items, the shell body is provided with a accommodating cavity with an open end, and the accommodating cavity is used to accommodate a winding core; the cover plate is sealed at the opening of the accommodating cavity, and the first cover body is connected to the shell body.

[0012] The utility model also provides a battery, comprising a winding core and the above-mentioned shell assembly, wherein the winding core is installed in the accommodating cavity of the shell assembly.

[0013] Optionally, the winding core is connected with a positive electrode tab and a negative electrode tab;

[0014] The positive electrode tab is connected to the bottom of the shell body, and the negative electrode tab is connected to the cover plate; or, the positive electrode tab is connected to the cover plate, and the negative electrode tab is connected to the bottom of the shell body.

[0015] The beneficial effects of the utility model are:

[0016] In the cover plate, shell assembly and battery provided by the utility model, since the first insulating layer is formed by a composite of an adhesive layer and a high-temperature resistant layer, during hot pressing and compounding, the adhesive layers on both sides of the high-temperature resistant layer are respectively bonded to the first cover body and the second cover body, and the high-temperature resistant layer can withstand the high temperature during hot pressing and compounding, thereby avoiding a short circuit between the first cover body and the second cover body, and improving the safety performance of the battery.

[0017] Furthermore, the high temperature resistant layer is a polymer layer or a metal layer, so that the high temperature resistant layer can not only resist high temperature, but also block the flow of water and oxygen, prevent water and oxygen from corroding and entering the interior of the battery, and improve the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a schematic structural diagram of a battery in one embodiment of the utility model;

[0020] Figure 2 yes Figure 1 A schematic enlarged view of part A;

[0021] Figure 3 It is a schematic structural diagram of the first insulating layer of a battery in one embodiment of the utility model.

[0022] In the figure: 100, first cover body, 110, through hole, 200, first insulating layer, 210, first adhesive layer, 220, high temperature resistant layer, 230, second adhesive layer, 300, second cover body, 310, protrusion, 400, winding core, 410, positive electrode ear, 420, negative electrode ear, 500, second insulating layer, 600, shell body, 610, accommodating cavity. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] In the description of the present invention, it should be understood that the terms "longitudinal", "radial", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Figure 1 : is a schematic structural diagram of a battery in an embodiment of the utility model, such as Figure 1 As shown, and refer to Figures 2 to 3An embodiment of the utility model provides a cover plate, including a first cover body 100, a first insulating layer 200 and a second cover body 300, wherein the first cover body 100, the first insulating layer 200 and the second cover body 300 are stacked; the first insulating layer 200 includes a first adhesive layer 210, a second adhesive layer 230 and a high temperature resistant layer 220, the first adhesive layer 210 and the second adhesive layer 230 are respectively arranged on both sides of the high temperature resistant layer 220, and the first cover body 100 is connected to the first adhesive layer 210, and the second cover body 300 is connected to the second adhesive layer 230.

[0027] In the embodiment of the utility model, since the first insulating layer 200 is formed by compounding the first adhesive layer 210, the second adhesive layer 230 and the high temperature resistant layer 220, during hot pressing compounding, the first adhesive layer 210 and the second adhesive layer 230 located on both sides of the high temperature resistant layer 220 are respectively bonded to the first cover body 100 and the second cover body 300, and the high temperature resistant layer 220 can withstand the high temperature during hot pressing compounding, thereby avoiding short circuit between the first cover body 100 and the second cover body 300, thereby improving the safety performance of the battery.

[0028] like Figure 2 , Figure 3 As shown, in one embodiment of the present invention, the inner edge of the first adhesive layer 210 is connected to the inner edge of the second adhesive layer 230, and the outer edge of the first adhesive layer 210 is connected to the outer edge of the second adhesive layer 230. In this way, the first adhesive layer 210 and the second adhesive layer 230 can completely wrap the high temperature resistant layer 220, thereby improving the integrity of the first insulating layer 200 and preventing the first adhesive layer 210, the second adhesive layer 230 and the high temperature resistant layer 220 from being separated.

[0029] Specifically, the high temperature resistant layer 220 is a polymer layer or a metal layer. Preferably, the polymer layer is a PI film with a thickness of 5-30 μm; the metal layer is an aluminum layer, etc. This configuration enables the high temperature resistant layer 220 to not only resist high temperatures, but also block the flow of water and oxygen, prevent water and oxygen from corroding and entering the battery, and improve the safety performance of the battery.

[0030] In one embodiment of the utility model, a through hole 110 is provided on the first cover body 100, and a protrusion 310 is provided on the second cover body 300. The protrusion 310 is located in the through hole 110 and is electrically connected to the winding core 400. The inner edge of the first insulating layer 200 extends between the protrusion 310 and the inner wall of the through hole 110, so as to insulate the first cover body 100 from the second cover body 300.

[0031] In one embodiment of the present invention, the cover plate further includes a second insulating layer 500, which is disposed on a side of the first cover body 100 away from the first insulating layer 200. In this configuration, the second insulating layer 500 is located between the first cover body 100 and the winding core 400 to prevent the first cover body 100 from being electrically connected to the winding core 400, thereby preventing a short circuit in the battery.

[0032] Specifically, the second insulating layer 500 includes one of adhesive tape, film and ceramic sheet.

[0033] The embodiment of the utility model further provides a shell assembly, comprising a shell body 600 and a cover plate as in any of the above embodiments, so as to have all the effects of the cover plate. The shell body 600 is provided with a receiving cavity 610 with an open end, and the receiving cavity 610 is used to receive the winding core 400; the cover plate is sealed at the opening of the receiving cavity 610, the first cover body 100 is connected to the shell body 600, and the second insulating layer 500 is located in the receiving cavity 610.

[0034] The embodiment of the utility model further provides a battery, comprising a winding core 400 and the shell assembly in the above embodiment, so as to have all the effects of the shell assembly. The winding core 400 is installed in the accommodating cavity 610 of the shell assembly.

[0035] In one embodiment of the present invention, the winding core 400 is connected with a positive electrode tab 410 and a negative electrode tab 420. The positive electrode tab 410 is connected to the bottom of the shell body 600, and the negative electrode tab 420 is connected to the cover plate; or, the positive electrode tab 410 is connected to the cover plate, and the negative electrode tab 420 is connected to the bottom of the shell body 600.

[0036] When preparing the battery provided by the embodiment of the utility model, the first adhesive layer 210, the high temperature resistant layer 220, and the second adhesive layer 230 are sequentially stacked and hot-pressed to obtain the first insulating layer 200. Then the first cover body 100, the first insulating layer 200 and the second cover body 300 are hot-pressed to obtain the cover plate. The second insulating layer 500 is applied to the first cover body 100 to obtain the cover plate. The core 400 is placed in the shell body 600, and the negative pole ear 420 and the positive pole ear 410 of the core 400 are respectively connected to the shell body 600 and the cover plate by laser welding, resistance welding, ultrasonic welding, etc. The assembled core 400 is then baked and injected with liquid; after the injection is completed, the cover plate is welded to the shell by laser welding to seal it.

[0037] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A cover plate, characterized in that: It includes a first cover body, a first insulating layer and a second cover body, wherein the first cover body, the first insulating layer and the second cover body are stacked; the first insulating layer includes a first adhesive layer, a second adhesive layer and a high temperature resistant layer, wherein the first adhesive layer and the second adhesive layer are respectively arranged on both sides of the high temperature resistant layer, and the first cover body is connected to the first adhesive layer, and the second cover body is connected to the second adhesive layer.

2. The cover plate according to claim 1, characterized in that: The inner edge of the first adhesive layer is connected to the inner edge of the second adhesive layer, and the outer edge of the first adhesive layer is connected to the outer edge of the second adhesive layer.

3. The cover plate according to claim 1, characterized in that: The high temperature resistant layer is a polymer layer or a metal layer.

4. The cover plate according to claim 1, characterized in that: The thickness of the high temperature resistant layer is 5-30 μm.

5. The cover plate according to claim 1, characterized in that: The first cover body is provided with a through hole, the second cover body is provided with a protrusion, and the protrusion is located in the through hole; the inner edge of the first insulating layer extends between the protrusion and the inner wall of the through hole.

6. The cover plate according to claim 1, characterized in that: The cover plate further includes a second insulating layer, which is disposed on a side of the first cover body away from the first insulating layer.

7. The cover plate according to claim 6, characterized in that: The second insulating layer includes one of adhesive tape, film and ceramic sheet.

8. A housing assembly, characterized in that: It comprises a shell body and a cover plate as described in any one of claims 1 to 7, wherein the shell body is provided with a receiving cavity with an opening at one end, and the receiving cavity is used to receive a winding core; the cover plate is sealed at the opening of the receiving cavity, and the first cover body is connected to the shell body.

9. A battery, characterized in that: It comprises a winding core and a shell assembly as claimed in claim 8, wherein the winding core is installed in the accommodating cavity of the shell assembly.

10. The battery according to claim 9, characterized in that The winding core is connected with a positive electrode ear and a negative electrode ear; The positive electrode tab is connected to the bottom of the shell body, and the negative electrode tab is connected to the cover plate; or, the positive electrode tab is connected to the cover plate, and the negative electrode tab is connected to the bottom of the shell body.

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