Cover plate, shell assembly and battery

Abstract

The utility model discloses a cover plate, shell component and battery, the cover plate comprises a cover plate body and a limit piece arranged on the cover plate body, the cover plate body is used for being matched with a shell so as to seal a roll core in the shell; the limiting piece abuts against the roll core, a first insulating layer is arranged on the limiting piece, and the first insulating layer is located between the limiting piece and the roll core. According to the utility model, the limiting piece is arranged on the cover plate body, the limiting piece is propped against the roll core during application, the roll core is fixed between the cover plate body and the shell, and the roll core is prevented from shaking in the shell, so that the vibration and falling performance of the battery core is improved, and the service life of the battery is prolonged. Meanwhile, due to the arrangement of the limiting piece, a gap exists between the roll core and the cover plate body, and when the shell and the cover plate body are welded and sealed, the influence of high temperature generated by welding on the roll core can be reduced. Moreover, the first insulating layer is arranged between the limiting piece and the roll core, so that the limiting piece can be prevented from being electrically connected with the roll core, and short circuit of the battery is avoided.

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 order to facilitate the assembly of the core into the shell, the existing steel shell button lithium battery usually reduces the volume of the core or increases the volume of the steel shell to improve the yield rate of the core into the shell. However, this arrangement results in a large amount of movable space for the core in the steel shell, and the core is easy to shake in the steel shell, resulting in poor vibration and drop performance of the core, which affects the service life of the lithium 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 of poor vibration and drop performance of the winding core.

[0004] Specifically, the utility model provides a cover plate, including a cover plate body and a limiting member arranged on the cover plate body, wherein the cover plate body is used to cooperate with a shell to seal the winding core in the shell; the limiting member abuts against the winding core, and a first insulating layer is arranged on the limiting member, and the first insulating layer is located between the limiting member and the winding core.

[0005] Optionally, the thickness of the first insulating layer is 0.02-0.1 mm.

[0006] Optionally, the cover body includes a first cover, a second insulating layer and a second cover, the first cover, the second insulating layer and the second cover are stacked, the first cover is connected to the shell, and the limiter is arranged on the first cover.

[0007] 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 second insulating layer extends between the protrusion and the inner wall of the through hole.

[0008] Optionally, the outer edge of the first insulating layer extends to the second cover body, and the side of the first insulating layer close to the through hole is connected to the inner edge of the second insulating layer, and the side of the first insulating layer away from the through hole is connected to the side wall of the shell or spaced apart from the side wall of the shell.

[0009] Optionally, the length of the limiting member in the radial direction of the shell is 1-3 mm, and the length of the limiting member in the axial direction of the shell is 0.5-1 mm.

[0010] Optionally, the limiting member includes a limiting boss, the limiting boss is a structural member with a ring-shaped cross section, and the limiting boss is arranged on the lower surface of the cover body;

[0011] Alternatively, the limiting member includes a plurality of limiting blocks, and the plurality of limiting blocks are evenly arranged on the lower surface of the cover body along a preset circumference.

[0012] The utility model also provides a shell assembly, comprising a shell and a cover plate as described in any one of the above items, wherein the shell is provided with a receiving cavity with an open end, the receiving cavity is used to receive a winding core, and the cover plate body is sealed at the opening of the receiving cavity.

[0013] The utility model also provides a battery, comprising a winding core and the shell assembly as described above, wherein the winding core is installed in the accommodating cavity of the shell assembly.

[0014] Optionally, the winding core includes a positive electrode sheet, a negative electrode sheet and a diaphragm, the length of the diaphragm in the axial direction of the shell is greater than the length of the negative electrode sheet in the axial direction of the shell; the length of the limiter in the axial direction of the shell is greater than the distance between the diaphragm and the cover body, and the length of the limiter in the axial direction of the shell is less than the distance between the negative electrode sheet and the cover 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 a limiting member is provided on the cover plate body, the limiting member abuts against the winding core during use, and the winding core is fixed between the cover plate body and the shell, so as to prevent the winding core from shaking in the shell, thereby improving the vibration and drop performance of the battery cell and increasing the service life of the battery. At the same time, due to the provision of the limiting member, there is a gap between the winding core and the cover plate body, and when the shell and the cover plate body are welded and sealed, the influence of the high temperature generated by the welding on the winding core can be reduced. In addition, since a first insulating layer is provided between the limiting member and the winding core, the first insulating layer can prevent the limiting member from being electrically connected to the winding core, thereby preventing the battery from short-circuiting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 is a schematic cross-sectional view of a housing assembly in one embodiment of the utility model;

[0019] Figure 2 It is a schematic cross-sectional view of a battery in one embodiment of the utility model.

[0020] In the figure: 100, shell, 110, accommodating cavity, 200, cover body, 210, stopper, 220, first insulating layer, 230, first cover body, 231, through hole, 240, second insulating layer, 250, second cover body, 251, protrusion, 300, winding core, 310, negative electrode sheet, 320, diaphragm DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] Figure 1 is a schematic cross-sectional view of a housing assembly in one embodiment of the present utility model, such as Figure 1 As shown, and refer to Figure 2 An embodiment of the utility model provides a cover plate, including a cover plate body 200 and a limiting member 210 arranged on the cover plate body 200, wherein the cover plate body 200 is used to cooperate with the shell 100 to seal the core 300 in the shell 100; the limiting member 210 abuts against the core 300, and a first insulating layer 220 is arranged on the limiting member 210, and the first insulating layer 220 is located between the limiting member 210 and the core 300.

[0025] In the embodiment of the utility model, since the limiter 210 is provided on the cover body 200, the limiter 210 abuts against the winding core 300 when in use, and the winding core 300 is fixed between the cover body 200 and the shell 100, so as to prevent the winding core 300 from shaking in the shell 100, thereby improving the vibration and drop performance of the battery cell and increasing the service life of the battery. At the same time, due to the provision of the limiter 210, there is a gap between the winding core 300 and the cover body 200, and when the shell 100 and the cover body 200 are welded and sealed, the influence of the high temperature generated by welding on the winding core 300 can be reduced.

[0026] Furthermore, since the first insulating layer 220 is disposed between the stopper 210 and the winding core 300, the first insulating layer 220 can prevent the stopper 210 from being electrically connected to the winding core 300, thereby preventing a short circuit of the battery. Preferably, the thickness of the first insulating layer 220 is 0.02-0.1 mm.

[0027] In one embodiment of the present invention, the cover body 200 includes a first cover body 230, a second insulating layer 240 and a second cover body 250, the first cover body 230, the second insulating layer 240 and the second cover body 250 are stacked, the first cover body 230 is connected to the shell 100, and the limit member 210 is set on the first cover body 230.

[0028] In the embodiment of the utility model, the first cover body 230, the second insulating layer 240 and the second cover body 250 are stacked and hot pressed to form the cover body 200, which has high overall strength. In addition, the second cover body 250 is entirely covered on the second insulating layer 240, and the top surface of the battery after welding has high flatness.

[0029] In one embodiment of the present invention, a through hole 231 is provided on the first cover body 230, and a protrusion 251 is provided on the second cover body 250. The protrusion 251 is located in the through hole 231 and is electrically connected to the winding core 300. The inner edge of the second insulating layer 240 extends between the protrusion 251 and the inner wall of the through hole 231, so as to insulate the first cover body 230 from the second cover body 250.

[0030] In one embodiment of the present invention, the outer edge of the first insulating layer 220 extends onto the second cover 250, and the side of the first insulating layer 220 close to the through hole 231 is connected to the inner edge of the second insulating layer 240; the side of the first insulating layer 220 away from the through hole 231 is connected to the side wall of the housing 100 or is spaced from the side wall of the housing 100. This arrangement allows the first insulating layer 220 to completely wrap the stopper 210, preventing the stopper 210 from being electrically connected to the winding core 300, causing a battery short circuit.

[0031] In an embodiment of the present invention, the length of the limiting member 210 in the radial direction of the housing 100 is 1-3 mm, and the length of the limiting member 210 in the axial direction of the housing 100 is 0.5-1 mm.

[0032] In one embodiment of the present invention, the position-limiting member 210 includes a position-limiting boss, which is a structural member with an annular cross section, and the position-limiting boss is arranged on the lower surface of the cover body 200. Alternatively, the position-limiting member 210 includes a plurality of position-limiting blocks, which are evenly arranged along a preset circumference on the lower surface of the cover body 200. The present embodiment of the utility model provides a variety of arrangement forms of the position-limiting member 210 to be applicable to batteries of different structures.

[0033] The utility model further provides a housing assembly, comprising a housing 100 and a cover plate as in any of the above embodiments, so as to have all the effects of the cover plate.

[0034] In one embodiment of the utility model, the housing 100 is provided with a receiving cavity 110 with an open end, and the receiving cavity 110 is used to receive the winding core 300. The cover body 200 covers the opening of the receiving cavity 110, and the stopper 210 is located in the receiving cavity 110 and abuts against the winding core 300 in the receiving cavity 110.

[0035] like Figure 2 As shown, the utility model further provides a battery, comprising a winding core 300 and a shell assembly as in any of the above embodiments, so as to have all the effects of the shell assembly. The winding core 300 is installed in the accommodating cavity 110 of the shell assembly.

[0036] In one embodiment of the present invention, the winding core 300 includes a positive electrode sheet, a negative electrode sheet 310 and a diaphragm 320, and the length of the diaphragm 320 in the axial direction of the housing 100 is greater than the length of the negative electrode sheet 310 in the axial direction of the housing 100. The length of the stopper 210 in the axial direction of the housing 100 is greater than the distance between the diaphragm 320 and the cover body 200, and the length of the stopper 210 in the axial direction of the housing 100 is less than the distance between the negative electrode sheet 310 and the cover body 200. This arrangement ensures that the stopper 210 can fix the winding core 300 and prevents the stopper 210 from damaging the winding core 300 during the downward pressing process.

[0037] In one embodiment of the present invention, both the positive electrode sheet and the negative electrode sheet 310 are connected with tabs. The tab on the positive electrode sheet is connected to the bottom of the housing 100, and the tab on the negative electrode sheet 310 is connected to the protrusion 251 on the second cover 250. Alternatively, the tab on the positive electrode sheet is connected to the protrusion 251 on the second cover 250, and the tab on the negative electrode sheet 310 is connected to the bottom of the housing 100.

[0038] When preparing the battery provided by the embodiment of the utility model, the first cover body 230, the second insulating layer 240 and the second cover body 250 are heat-pressed and composited, and the first insulating layer 220 is applied to the stopper 210. The winding core 300 is placed in the shell 100, and the pole ear of the winding core is connected to the shell 100 and the cover body 200 by laser welding, resistance welding, ultrasonic welding, etc. Then the assembled winding core is baked and injected; after the injection is completed, the cover body 200 is welded to the shell 100 by laser welding to seal it.

[0039] 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 cover body and a limiting member arranged on the cover body, wherein the cover body is used to cooperate with the shell to seal the winding core in the shell; the limiting member abuts against the winding core, and a first insulating layer is arranged on the limiting member, and the first insulating layer is located between the limiting member and the winding core.

2. The cover plate according to claim 1, characterized in that: The thickness of the first insulating layer is 0.02-0.1 mm.

3. The cover plate according to claim 1, characterized in that: The cover body includes a first cover, a second insulating layer and a second cover, the first cover, the second insulating layer and the second cover are stacked, the first cover is connected to the shell, and the limiter is arranged on the first cover.

4. The cover plate according to claim 3, 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 second insulating layer extends between the protrusion and the inner wall of the through hole.

5. The cover plate according to claim 4, characterized in that: The outer edge of the first insulating layer extends to the second cover, and the side of the first insulating layer close to the through hole is connected to the inner edge of the second insulating layer, and the side of the first insulating layer away from the through hole is connected to the side wall of the shell or spaced apart from the side wall of the shell.

6. The cover plate according to claim 1, characterized in that: The length of the limiting member in the radial direction of the housing is 1-3 mm, and the length of the limiting member in the axial direction of the housing is 0.5-1 mm.

7. The cover plate according to claim 1, characterized in that: The limiting member includes a limiting boss, which is a structural member with a ring-shaped cross section and is arranged on the lower surface of the cover body; Alternatively, the limiting member includes a plurality of limiting blocks, and the plurality of limiting blocks are evenly arranged on the lower surface of the cover body along a preset circumference.

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

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 includes a positive electrode sheet, a negative electrode sheet and a diaphragm, wherein the length of the diaphragm in the axial direction of the shell is greater than the length of the negative electrode sheet in the axial direction of the shell; the length of the limiting member in the axial direction of the shell is greater than the distance between the diaphragm and the cover body, and the length of the limiting member in the axial direction of the shell is less than the distance between the negative electrode sheet and the cover body.

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