Top cover assembly, battery cell and battery pack

Abstract

The utility model provides a top cover assembly, battery cell and battery pack, the top cover assembly includes cover plate, pole plate, sealant and first glue blocking structure, the cover plate is equipped with the through hole, the through hole is used for communicating with the inside of battery cell, pole plate is installed on the cover plate and covers the through hole, sealant is clamped between cover plate and pole plate, and the first glue blocking structure is used for blocking the first glue blocking structure. The first glue blocking structure is arranged on the side, close to the through hole, of the sealant so as to prevent the sealant from overflowing into the through hole. According to the top cover assembly provided by the utility model, the technical problem that the sealant in the existing top cover assembly is easy to overflow through the through hole in the cover plate can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a top cover assembly, a battery core and a battery pack. Background Art

[0002] In the related art, the battery cell includes a mounting shell, a core pack, and a top cover assembly. The mounting shell is provided with a mounting cavity and a top opening connected to the mounting cavity. The core pack is installed in the mounting cavity, and the top cover assembly covers the top opening of the mounting shell to protect the core pack. The top cover assembly includes a cover plate and a pole plate. The pole plate is pressed and mounted on the cover plate by sealant. The cover plate is provided with a through hole connected to the mounting cavity to facilitate electrical connection between the pole plate and the core pack. However, when the pole plate is pressed and mounted on the cover plate by sealant, the sealant easily overflows the cover plate through the through hole on the cover plate, resulting in an increase in the total thickness of the top cover assembly, which in turn takes up space in the mounting shell and reduces the energy density of the battery cell. Utility Model Content

[0003] The embodiments of the present invention provide a top cover assembly, a battery cell and a battery pack, which can improve the technical problem that the sealant in the existing top cover assembly easily overflows through the through holes on the cover plate.

[0004] In a first aspect, embodiments of the present invention provide a top cover assembly, comprising a cover plate, a column plate, a sealant, and a first sealant blocking structure. The cover plate is provided with a through-hole for communicating with the interior of a battery cell, the column plate is mounted on the cover plate and covers the through-hole, the sealant is sandwiched between the cover plate and the column plate, and the first sealant blocking structure is provided on a side of the sealant proximal to the through-hole to prevent the sealant from overflowing into the through-hole.

[0005] In one embodiment, the outer peripheral wall of the first glue blocking structure and the inner peripheral wall of the through hole are arranged opposite to each other along the thickness direction of the cover plate, or the first glue blocking structure is at least partially located between the cover plate and the pole plate.

[0006] In one embodiment, the through hole and the first glue-blocking structure are both circular in shape, and the outer diameter of the first glue-blocking structure is greater than or equal to the inner diameter of the through hole.

[0007] In one embodiment, the first glue blocking structure is at least partially located between the cover plate and the pole plate, and the first glue blocking structure is connected to the pole plate; and a first glue overflow gap is formed between the first glue blocking structure and the cover plate, or the first glue blocking structure is connected to the cover plate, and a first glue overflow gap is formed between the first glue blocking structure and the pole plate.

[0008] In one embodiment, the pole plate has a first sealing surface facing the cover plate, the sealant is clamped between the first sealing surface and the cover plate, the first glue blocking structure is connected to the first sealing surface, and in the thickness direction of the cover plate, the width of the first glue overflow gap is less than or equal to the protruding height of the first glue blocking structure relative to the first sealing surface.

[0009] In one embodiment, the top cover assembly further includes a first insulating sheet, which is attached to the pole plate and forms the first glue blocking structure.

[0010] In one embodiment, the pole plate has a first sealing surface facing the cover plate, and the first sealing surface is further provided with a connecting protrusion at a position corresponding to the through hole, and the connecting protrusion is used to electrically connect to the core package in the battery cell, and the first insulating sheet is annular and arranged around the connecting protrusion.

[0011] In one embodiment, the inner peripheral wall of the first insulating sheet abuts against the outer peripheral wall of the connecting protrusion.

[0012] In one embodiment, the top cover assembly further includes a second glue blocking structure, which is located on a side of the sealant away from the through hole to limit the sealant from overflowing to a side of the pole plate away from the cover plate.

[0013] In one embodiment, the inner peripheral wall of the second glue blocking structure is arranged opposite to the outer peripheral wall of the pole plate along the thickness direction of the pole plate, or the second glue blocking structure is at least partially located between the cover plate and the pole plate.

[0014] In one embodiment, the pole plate and the second adhesive stop structure are both circular in shape, and the inner diameter of the second adhesive stop structure is smaller than or equal to the outer diameter of the pole plate.

[0015] In one embodiment, the second glue blocking structure is at least partially located between the cover plate and the pole plate; the second glue blocking structure is connected to the pole plate, and a second glue overflow gap is formed between the second glue blocking structure and the cover plate, or the second glue blocking structure is connected to the cover plate, and a second glue overflow gap is formed between the second glue blocking structure and the cover plate.

[0016] In one embodiment, the cover plate has a second sealing surface facing the pole plate, the sealant is clamped between the second sealing surface and the pole plate, the second glue blocking structure is connected to the second sealing surface, and in the thickness direction of the cover plate, the width of the second glue overflow gap is less than or equal to the protruding height of the second glue blocking structure relative to the second sealing surface.

[0017] In one embodiment, the top cover assembly further includes a second insulating sheet, which is attached to the cover plate and forms the second glue blocking structure.

[0018] In one embodiment, the thickness of the cover plate at any position thereof is greater than or equal to 0.05 mm and less than or equal to 1 mm, and / or the thickness of the pole plate at any position thereof is greater than or equal to 0.05 mm and less than or equal to 1 mm.

[0019] In the second aspect, an embodiment of the present invention provides a battery cell, which includes a mounting shell, a core pack and the top cover assembly described in any one of the above embodiments, the mounting shell is provided with a mounting cavity and an opening connected to the mounting cavity, the core pack is installed in the mounting cavity, the cover plate covers the opening, and the pole plate is electrically connected to the core pack at the through hole.

[0020] In one embodiment, the core package is provided with a first pole tab and a second pole tab, the first pole tab is electrically connected to the pole plate, the second pole tab is clamped between the outer peripheral wall of the cover plate and the inner peripheral wall of the installation cavity, and the pole tab is electrically connected to the cover plate.

[0021] In one embodiment, a folding portion is provided on the outer periphery of the cover plate, and the folding portion extends parallel to the inner peripheral wall of the installation cavity, and the folding portion is in contact with the inner peripheral wall of the installation cavity, and the second tab is clamped between the folding portion and the inner peripheral wall of the installation cavity.

[0022] In a third aspect, an embodiment of the present invention provides a battery pack, which includes the battery cell as described in any of the above embodiments.

[0023] Beneficial effects of the embodiments of the present utility model:

[0024] In an embodiment of the present invention, a first glue blocking structure is provided, which is located on the side of the sealant close to the through hole of the cover plate, and the first glue blocking structure can limit the sealant from overflowing into the through hole of the cover plate, thereby making it difficult for the sealant to overflow from the through hole on the cover plate, thereby avoiding the sealant overflowing through the through hole on the cover plate and causing the total thickness of the top cover assembly to increase, thereby avoiding the top cover assembly from occupying too much space in the installation shell, and ensuring the energy density of the battery cell.

[0025] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a structural cross-sectional view of an embodiment of the top cover assembly of the present application;

[0028] Figure 2 yes Figure 1 Structural exploded diagram of the top cover assembly;

[0029] Figure 3 This is an exploded view and structural cross-sectional view of an embodiment of the top cover assembly of the present application before being pressed together;

[0030] Figure 4 This is a combined diagram and a structural cross-sectional view of an embodiment of the top cover assembly of the present application before being pressed together;

[0031] Figure 5 This is a structural cross-sectional view of an embodiment of a battery cell of the present application. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0033] Firstly, in order to improve the technical problem that the sealant in the existing top cover assembly easily overflows through the through hole on the cover plate, such as Figure 1 As shown, an embodiment of the present invention provides a top cover assembly 100 , which includes a cover plate 10 , a pole plate 20 , a sealant 30 and a first sealant blocking structure 40 .

[0034] Among them, you can refer to Figure 2 , Figure 2 for Figure 1The structural exploded diagram of the top cover assembly 100 in FIG. 1 shows a through hole 11 on the cover plate 10. The through hole 11 is used to communicate with the interior of the battery cell 200. Specifically, the top cover assembly 100 of the present application is applied to the cylindrical battery cell 200. The outer shape of the cover plate 10 is circular. The through hole 11 penetrates the cover plate 10 along the thickness direction of the cover plate 10, and the through hole 11 is located at the center of the cover plate 10, that is, the through hole 11 is coaxially arranged with the cover plate 10. Figure 5 When the top cover assembly 100 is applied to the battery cell 200, the cover plate 10 is installed at the opening 212 of the mounting shell 210 to cover the opening 212 of the mounting shell 210. The through hole 11 on the cover plate 10 is connected to the mounting cavity 211 in the mounting shell 210, so as to facilitate electrical connection between the core package 220 in the mounting cavity 211 and the pole plate 20 installed on the cover plate 10.

[0035] Of course, when the top cover assembly 100 needs to be applied to the square column battery cell 200 or the battery cell 200 of other shapes, the shape of the cover plate 10 can be adaptively designed, for example, the shape of the cover plate 10 can be adaptively designed to be polygonal, elliptical, etc.

[0036] In addition, the shape of the through hole 11 can be circular, square, or other shapes, as long as it facilitates electrical connection between the pole plate 20 and the tab of the core package 220. For example, in this embodiment, the through hole 11 and the cover plate 10 are both circular to adapt to the cylindrical battery cell 200.

[0037] It should be noted that the cover plate 10 is made of a conductive material to facilitate electrical connection with the tabs of the core package 220. The cover plate 10 can be made of a metal material such as stainless steel, copper, iron, or aluminum alloy, or a conductive non-metallic material. Furthermore, the cover plate 10 can be made by processes such as stamping, turning, and cutting. The specific molding process can be flexibly selected based on actual conditions.

[0038] like Figure 1 As shown, the pole plate 20 is mounted on the cover plate 10 and covers the through hole 11 , and the pole plate 20 is provided with a first glue overflow groove 21 at a position corresponding to the through hole 11 , with the notch of the first glue overflow groove 21 facing the through hole 11 .

[0039] Specifically, the pole plate 20 is made of a conductive material to facilitate electrical connection with the tabs of the core package 220. The pole plate 20 can be made of a metal material such as stainless steel, copper, iron, or aluminum alloy, or a conductive non-metallic material. Furthermore, the pole plate 20 can be made by processes such as stamping, turning, and cutting. The specific molding process can be flexibly selected based on actual conditions.

[0040] During assembly, the pole plate 20 is fixed to the cover plate 10, and the area of ​​the pole plate 20 is larger than the area of ​​the through hole 11, so that the pole plate 20 can completely cover the through hole 11, ensuring the sealing of the battery cell 200. In this embodiment, the pole plate 20 and the through hole 11 are both circular and coaxially arranged. Of course, the pole plate 20 and the through hole 11 can also be set to different shapes, as long as the pole plate 20 can completely cover the through hole 11 on the cover plate 10.

[0041] like Figure 1 As shown, in order to improve the sealing performance when the pole plate 20 covers the through hole 11, the top cover assembly 100 is further provided with a sealant 30, which is sandwiched between the cover plate 10 and the pole plate 20. During assembly, the sealant 30 in a semi-solid or molten state can be placed on the cover plate 10 first, and the sealant 30 is arranged around the through hole 11. Then, the pole plate 20 is pressed onto the sealant 30 by hot pressing or cold pressing. After the sealant 30 solidifies, the sealant 30 can be sealed between the cover plate 10 and the pole plate 20, thereby ensuring the sealing performance of the pole plate 20 covering the through hole 11.

[0042] It is understandable that during the process of the sealant 30 being pressed by the pole plate 20, the sealant 30 will overflow into the through hole 11 due to deformation. Therefore, in order to prevent the sealant 30 from overflowing into the through hole 11, the top cover assembly 100 of the present application is also provided with a first sealant blocking structure 40. The first sealant blocking structure 40 is provided on the side of the sealant 30 close to the through hole 11 to prevent the sealant 30 from overflowing into the through hole 11, thereby making it difficult for the sealant 30 to overflow from the through hole 11 on the cover plate 10, and avoiding the sealant 30 overflowing through the through hole 11 on the cover plate 10, causing the total thickness of the top cover assembly 100 to increase, thereby avoiding the top cover assembly 100 from occupying too much space in the mounting shell 210, thereby ensuring the energy density of the battery cell 200.

[0043] It should be noted that the first glue blocking structure 40 can be in the form of a block or sheet, and can be connected to the cover plate 10 or the pole plate 20, or can be sandwiched between the cover plate 10 and the pole plate 20 together with the sealant 30. Of course, the first glue blocking structure 40 can also be integrally formed with the cover plate 10 or the pole plate 20. In this case, to ensure insulation between the cover plate 10 and the pole plate 20, the surface of the first glue blocking structure 40 can be coated with an insulating layer. When the first glue blocking structure 40 is an independent component (i.e., not integrally formed with the cover plate 10 or the pole plate 20), the first glue blocking structure 40 can be made of an insulating material.

[0044] In addition, it should be noted that in order to effectively prevent the sealant 30 from overflowing into the through hole 11 , the first sealant blocking structure 40 can block the sealant 30 at the edge of the through hole 11 or at any position outside the through hole 11 .

[0045] For example, in one embodiment, the outer peripheral wall of the first glue blocking structure 40 and the inner peripheral wall of the through hole 11 are arranged opposite to each other along the thickness direction of the cover plate 10, that is, the first glue blocking structure 40 at this time blocks the sealant 30 at the edge position of the through hole 11 to prevent the sealant 30 from overflowing into the through hole 11.

[0046] Alternatively, in another embodiment, reference may be made to Figure 1 The first glue blocking structure 40 is at least partially located between the cover plate 10 and the pole plate 20 , that is, the first glue blocking structure 40 blocks the sealant 30 outside the through hole 11 , which can also prevent the sealant 30 from overflowing into the through hole 11 .

[0047] In short, the specific position where the first glue blocking structure 40 blocks the sealant 30 can be flexibly selected according to needs.

[0048] In addition, the shapes of the first glue blocking structure 40 and the through hole 11 can be the same (for example, both are circular) or different (for example, the through hole 11 is square, and the first glue blocking structure 40 is annular and surrounds the outside of the through hole 11), as long as the first glue blocking structure 40 can prevent the sealant 30 from overflowing into the through hole 11.

[0049] Optionally, in a specific embodiment, the through hole 11 and the first glue stop structure 40 are both circular in shape, wherein the first glue stop is specifically annular, and the outer diameter of the first glue stop structure 40 is greater than or equal to the inner diameter of the through hole 11. When the outer diameter of the first glue stop structure 40 is equal to the inner diameter of the through hole 11, the first glue stop structure 40 blocks the sealant 30 at the edge of the through hole 11. At this time, because the first glue stop structure 40 is above the through hole 11, in order to prevent the first glue stop structure 40 from falling into the through hole 11, the first glue stop structure 40 can be connected to the pole plate 20. When the outer diameter of the first glue stop structure 40 is greater than the inner diameter of the through hole 11, the first glue stop structure 40 is partially located between the cover plate 10 and the pole plate 20. At this time, the first glue stop structure 40 blocks the sealant 30 outside the through hole 11.

[0050] Optionally, in one embodiment, as Figure 1 As shown, the first glue blocking structure 40 is at least partially located between the cover plate 10 and the pole plate 20, the first glue blocking structure 40 is connected to the pole plate 20, and a first glue overflow gap 50 is formed between the first glue blocking structure 40 and the cover plate 10, or the first glue blocking structure 40 is connected to the cover plate 10, and a first glue overflow gap 50 is formed between the first glue blocking structure 40 and the pole plate 20.

[0051] Specifically, reference can be made to Figure 1 In the process of pressing the pole plate 20 to the sealant 30, it is ideal that the inner and outer circumferential walls of the sealant 30 abut against the first and second sealant blocking structures 40 and 70 respectively. However, in the actual production process, in order to avoid some positions between the cover plate 10 and the pole plate 20 not being filled with the sealant 30, thereby affecting the insulation between the cover plate 10 and the pole plate 20, the amount of the sealant 30 used before pressing may be a little more than the ideal amount. At this time, if the first and second sealant blocking structures 40 and 70 completely block the inner and outer sides of the sealant 30, the sealant 30 may extrude the pole plate 20 upward, thereby causing the pole plate 20 to be unevenly installed and affecting the total thickness of the top cover assembly 100. Figure 4

[0052] Therefore, in the embodiment, the first sealant blocking structure 40 is at least partially located between the cover plate 10 and the pole plate 20, and a first sealant overflow gap 50 is formed between the first sealant blocking structure 40 and the cover plate 10 or between the first sealant blocking structure 40 and the pole plate 20. In this way, when the amount of the sealant 30 is relatively large, the sealant 30 can overflow into the first sealant overflow gap 50, thereby avoiding extruding the pole plate 20 upward.

[0053] It should be noted that, because the first sealant blocking structure 40 is at least partially located between the cover plate 10 and the pole plate 20, a certain distance is formed between the sealant 30 and the through hole 11, and the first sealant overflow gap 50 is relatively small, so that the friction of the sealant 30 flowing in the first sealant overflow gap 50 is relatively large. Therefore, even if the first sealant overflow gap 50 is provided, the sealant 30 is not easy to overflow into the through hole 11.

[0054] Optionally, in an embodiment, as shown in Figure 1 The pole plate 20 has a first sealing surface 21 facing the cover plate 10, the sealant 30 is clamped between the first sealing surface 21 and the cover plate 10, the first sealant blocking structure 40 is connected to the first sealing surface 21, and the width of the first sealant overflow gap 50 in the thickness direction of the cover plate 10 is less than or equal to the protruding height of the first sealant blocking structure 40 relative to the first sealing surface 21. That is, the width of the first sealant overflow gap 50 in the up-down direction (i.e., the thickness direction of the cover plate 10) can be designed to be relatively small, and the thickness of the first sealant blocking structure 40 in the up-down direction can be designed to be relatively large, so that the first sealant blocking structure 40 can block most of the sealant 30, and only a small part of the sealant 30 can overflow into the first sealant overflow gap 50. In this way, the sealant 30 can be allowed to overflow into the first sealant overflow gap 50, thereby avoiding extruding the pole plate 20 upward when the amount of the sealant 30 is relatively large, and the sealant 30 is not easy to overflow into the through hole 11.​

[0055] Optionally, in one embodiment, as Figure 2 As shown, Figure 2 for Figure 1 As shown in the exploded view of the structure of the top cover assembly 100, the top cover assembly 100 further includes a first insulating sheet 60. The first insulating sheet 60 is annular and is attached to the pole plate 20 to form a first adhesive stop structure 40. It can be understood that in this embodiment, the first adhesive stop structure 40 is formed by attaching the first insulating sheet 60 to the pole plate 20. This not only simplifies the structure and facilitates assembly, but also effectively insulates the pole plate 20 and the cover plate 10, achieving multiple goals at one stroke.

[0056] Optionally, in one embodiment, as Figure 3 As shown, the pole plate 20 has a first sealing surface 21 facing the cover plate 10. The first sealing surface 21 is further provided with a connecting protrusion 22 at a position corresponding to the through hole 11. The connecting protrusion 22 is used to electrically connect to the core package 220 in the battery cell 200. The first insulating sheet 60 is annular and arranged around the connecting protrusion 22. That is, the first insulating sheet 60 does not cover the connecting protrusion 22, and thus, on the basis of preventing the sealant 30 from overflowing into the through hole 11, ensures that a position for electrical connection with the core package 220 is reserved on the pole plate 20.

[0057] Optionally, in one embodiment, as Figure 3 As shown, the inner circumferential wall of the first insulating sheet 60 abuts against the outer circumferential wall of the connecting protrusion 22. That is, during assembly, the first insulating sheet 60 can be first sleeved over the connecting protrusion 22 and then pressed onto the cover plate 10 together with the pole plate 20. Because the inner circumferential wall of the first insulating sheet 60 abuts against the outer circumferential wall of the connecting protrusion 22, the first insulating sheet 60 can be quickly positioned during assembly. When the pole plate 20 and the first insulating sheet 60 are installed on the cover plate 10, displacement of the first insulating sheet 60 can be avoided, thereby improving structural stability.

[0058] Optionally, in one embodiment, as Figure 1 As shown, the top cover assembly 100 further includes a second glue blocking structure 70 , which is located on a side of the sealant 30 away from the through hole 11 to prevent the sealant 30 from overflowing to a side of the pole plate 20 away from the cover plate 10 .

[0059] Specifically, during the process of the sealant 30 being pressed against the pole plate 20, the sealant 30 will overflow toward the pole plate 20 due to deformation, and may overflow to a position higher than the upper surface of the pole plate 20, thereby increasing the total thickness of the top cover assembly 100. Therefore, in order to prevent the sealant 30 from overflowing to a position higher than the pole plate 20, the top cover assembly 100 of the present application is further provided with a second sealant blocking structure 70. The second sealant blocking structure 70 is provided on a side of the sealant 30 away from the through hole 11 to prevent the sealant 30 from overflowing outside the pole plate 20 and overflowing to a position higher than the pole plate 20. This not only prevents the total thickness of the top cover assembly 100 from increasing, but also allows the overflow size of the sealant 30 to be more stably controlled during the production process.

[0060] It should be noted that the second adhesive stop structure 70 can be in the form of a block or sheet, and can be connected to the cover plate 10 or the pole plate 20, or can be sandwiched between the cover plate 10 and the pole plate 20 together with the sealant 30. Of course, the second adhesive stop structure 70 can also be integrally formed with the cover plate 10 or the pole plate 20. In this case, to ensure insulation between the cover plate 10 and the pole plate 20, the surface of the second adhesive stop structure 70 can be coated with an insulating layer. When the second adhesive stop structure 70 is an independent component (i.e., not integrally formed with the cover plate 10 or the pole plate 20), the second adhesive stop structure 70 can be made of an insulating material.

[0061] In addition, it should be noted that in order to effectively prevent the sealant 30 from overflowing outside the pole plate 20, the second sealant blocking structure 70 can block the sealant 30 at the edge of the pole plate 20, or at the position covered by the pole plate 20.

[0062] For example, optionally, in one embodiment, the inner peripheral wall of the second glue blocking structure 70 and the outer peripheral wall of the pole plate 20 are arranged relative to each other along the thickness direction of the pole plate 20, that is, the second glue blocking structure 70 at this time blocks the sealant 30 at the edge position of the pole plate 20, so that the sealant 30 is not easy to overflow outside the pole plate 20.

[0063] Alternatively, optionally, in another embodiment, the second glue blocking structure 70 is at least partially located between the cover plate 10 and the pole plate 20, that is, the second glue blocking structure 70 at this time blocks the sealant 30 at the position covered by the pole plate 20, so that the sealant 30 is not easy to overflow outside the pole plate 20.

[0064] In short, the specific position where the second glue blocking structure 70 blocks the sealant 30 can be flexibly selected according to needs.

[0065] In addition, the shapes of the second glue blocking structure 70 and the pole plate 20 can be the same (for example, both are circular) or different (for example, the pole plate 20 is square and the first glue blocking structure 40 is annular), as long as the first glue blocking structure 40 can prevent the sealant 30 from overflowing outside the pole plate 20.

[0066] Optionally, in a specific embodiment, as Figure 1 As shown, the pole plate 20 and the second glue blocking structure 70 are both circular in shape, and the inner diameter of the second glue blocking structure 70 is less than or equal to the outer diameter of the pole plate 20. When the inner diameter of the second glue blocking structure 70 is equal to the outer diameter of the pole plate 20, the second glue blocking structure 70 blocks the sealant 30 at the edge of the pole plate 20. When the inner diameter of the second glue blocking structure 70 is less than the outer diameter of the pole plate 20, the second glue blocking structure 70 is partially located between the cover plate 10 and the pole plate 20. In this case, the second glue blocking structure 70 blocks the sealant 30 at the position covered by the pole plate 20.

[0067] Optionally, in one embodiment, as Figure 1 As shown, the second glue blocking structure 70 is at least partially located between the cover plate 10 and the pole plate 20; the second glue blocking structure 70 is connected to the pole plate 20, and a second glue overflow gap 80 is formed between the second glue blocking structure 70 and the cover plate 10, or the second glue blocking structure 70 is connected to the cover plate 10, and a second glue overflow gap 80 is formed between the second glue blocking structure 70 and the pole plate 20.

[0068] For details, please refer to Figure 1 When the pole plate 20 is pressed onto the sealant 30, the ideal state is that the inner and outer peripheral walls of the sealant 30 just abut the first sealant blocking structure 40 and the second sealant blocking structure 70. However, in the actual production process, in order to avoid that some positions between the cover plate 10 and the pole plate 20 are not filled with the sealant 30, thereby affecting the insulation between the cover plate 10 and the pole plate 20, therefore, as shown in FIG. Figure 4 As shown, before pressing, the amount of sealant 30 used may be slightly more than the ideal amount. At this time, if the first sealant blocking structure 40 and the second sealant blocking structure 70 completely block the inner and outer sides of the sealant 30, the sealant 30 may squeeze the pole plate 20 upward, thereby causing uneven installation of the pole plate 20 and affecting the total thickness of the top cover assembly 100.

[0069] Therefore, in this embodiment, the second glue-blocking structure 70 is at least partially located between the cover plate 10 and the pole plate 20, and a second glue-overflow gap 80 is formed between the second glue-blocking structure 70 and the cover plate 10, or a second glue-overflow gap 80 is formed between the second glue-blocking structure 70 and the pole plate 20. In this way, when a large amount of sealant 30 is used, the sealant 30 can overflow into the second glue-overflow gap 80, thereby preventing the sealant 30 from squeezing the pole plate 20 upward.

[0070] It should be noted here that because the second glue blocking structure 70 is at least partially located between the cover plate 10 and the pole plate 20, there is a certain distance between the sealant 30 and the outer periphery of the pole plate 20. In addition, the second glue overflow gap 80 is small, and the friction force of the sealant 30 when flowing in the second glue overflow gap 80 is large. Therefore, even if the second glue overflow gap 80 is set, the sealant 30 is not easy to overflow outside the pole plate 20.

[0071] Optionally, in one embodiment, as Figure 1 As shown, the cover plate 10 has a second sealing surface 12 facing the pole plate 20, and the sealant 30 is sandwiched between the second sealing surface 12 and the pole plate 20. The second sealant blocking structure 70 is connected to the second sealing surface 12. In the thickness direction of the cover plate 10, the width of the second sealant overflow gap 80 is less than or equal to the protrusion height of the second sealant blocking structure 70 relative to the second sealing surface 12. In other words, the width of the second sealant overflow gap 80 in the vertical direction (i.e., the thickness direction of the cover plate 10) can be designed to be smaller, and the thickness of the second sealant blocking structure 70 in the vertical direction can be designed to be larger. As a result, the second sealant blocking structure 70 can block most of the sealant 30, and only a small amount of the sealant 30 can overflow into the second sealant overflow gap 80. This allows the sealant 30 to overflow into the second sealant overflow gap 80, preventing the sealant 30 from squeezing the pole plate 20 upward when a large amount of sealant 30 is used, and also makes it difficult for the sealant 30 to overflow into the pole plate 20.

[0072] Optionally, in one embodiment, as Figure 3 As shown, the top cover assembly 100 further includes a second insulating sheet 90, which is attached to the cover plate 10 and forms a second adhesive stop structure 70. It can be understood that in this embodiment, the second adhesive stop structure 70 is formed by attaching the second insulating sheet 90 to the cover plate 10. This not only simplifies the structure and facilitates assembly, but also effectively insulates the pole plate 20 from the cover plate 10, achieving multiple goals at one stroke.

[0073] When assembling, please refer to Figure 3 The first insulating sheet 60 can be attached to the pole plate 20 to form one module, while the second insulating sheet 90 can be attached to the cover plate 10 to form another module. The two modules are then pressed together using a sealant 30. It can be understood that modular assembly can improve assembly efficiency and reduce production costs.

[0074] Optionally, in an embodiment, the thickness of the cover plate 10 at any position thereof (except the through hole 11) is greater than or equal to 0.05 mm and less than or equal to 1 mm, and the specific thickness can be 0.05 mm, 0.15 mm, 0.25 mm, 0.35 mm, 0.45 mm, 0.55 mm, 0.65 mm, 0.75 mm, 0.85 mm, 0.95 mm, 1 mm, etc.

[0075] It can be understood that if the thickness of the cover plate 10 is too small, the structural strength of the cover plate 10 will be weak and cannot play a good protection role; and if the thickness of the cover plate 10 is too large, the cover plate 10 will be too thick and heavy, which is not conducive to the lightweight design of the battery cell 200.

[0076] Therefore, by controlling the thickness of the cover plate 10 at any position thereof to be between 0.05 mm and 1 mm, the structural strength of the cover plate 10 can be ensured, and the lightweight design of the top cover assembly 100 and the battery cell 200 is also conducive.

[0077] Optionally, in an embodiment, the thickness of the pole plate 20 at any position thereof is greater than or equal to 0.05 mm and less than or equal to 1 mm, and the specific thickness can be 0.05 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.

[0078] It can be understood that if the thickness of the pole plate 20 is too small, the structural strength of the pole plate 20 will be weak and cannot play a good protection role; and if the thickness of the pole plate 20 is too large, the pole plate 20 will be too thick and heavy, which is not conducive to the lightweight design of the battery cell 200.

[0079] Therefore, by controlling the thickness of the pole plate 20 at any position thereof to be between 0.05 mm and 1 mm, the structural strength of the pole plate 20 can be ensured, and the lightweight design of the top cover assembly 100 and the battery cell 200 is also conducive.

[0080] In a second aspect, as Figure 5As shown, an embodiment of the present invention provides a battery cell 200, which includes a mounting shell 210, a core pack 220 and a top cover assembly 100, wherein the mounting shell 210 is provided with a mounting cavity 211 and an opening 212 connected to the mounting cavity 211, and the core pack 220 is installed in the mounting cavity 211. The core pack 220 is mainly wound by a positive electrode sheet, a negative electrode sheet and a diaphragm, and is a component that produces an electrochemical reaction in the battery cell 200. The specific structure of the core pack 220 can refer to the relevant existing technology and will not be described in more detail here. The specific structure of the top cover assembly 100 refers to the above embodiment, and the cover plate 10 in the top cover assembly 100 covers the opening 212, thereby completely closing the mounting cavity 211, and the pole plate 20 is electrically connected to the core pack 220 at the through hole 11.

[0081] It can be understood that since the battery cell 200 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0082] Optionally, in one embodiment, as Figure 5 As shown, the core package 220 is provided with a first pole ear 221 and a second pole ear 222, one of the first pole ear 221 and the second pole ear 222 is a positive pole ear, and the other is a negative pole ear. The first pole ear 221 is electrically connected to the pole plate 20, and the second pole ear 222 is clamped between the outer peripheral wall of the cover plate 10 and the inner peripheral wall of the installation cavity 211, and the pole ear is electrically connected to the cover plate 10, so that the core package 220 can be connected to the external circuit through the pole plate 20 and the cover plate 10.

[0083] It can be understood that in this embodiment, the second pole ear 222 is clamped between the outer peripheral wall of the cover plate 10 and the inner peripheral wall of the installation cavity 211. In this way, when the top cover assembly 100 is installed, the electrical connection between the second pole ear 222 and the cover plate 10 can be achieved, which simplifies the assembly process and thus improves production efficiency.

[0084] Optionally, in one embodiment, as Figure 5 As shown, a folding portion 13 is provided on the outer periphery of the cover plate 10, the folding portion 13 is folded upward, and the folding portion 13 extends parallel to the inner peripheral wall of the mounting cavity 211, and the folding portion 13 is in contact with the inner peripheral wall of the mounting cavity 211, and the second pole ear 222 is clamped between the folding portion 13 and the inner peripheral wall of the mounting cavity 211.

[0085] It can be understood that in this embodiment, by providing a folding portion 13 on the outer periphery of the cover plate 10, the cover plate 10 can increase the contact area with the mounting shell 210 through the folding portion 13, thereby making the top cover assembly 100 more stably installed on the mounting shell 210.

[0086] On the third aspect, an embodiment of the present invention provides a battery pack (not shown), which includes a battery cell 200 as in any of the above embodiments, and the battery cell 200 includes a top cover assembly 100 as in any of the above embodiments. Since the battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0087] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A top cover assembly, characterized in that: include: The cover plate is provided with a through hole, wherein the through hole is used to communicate with the interior of the battery cell; a pole plate, mounted on the cover plate and covering the through hole; Sealant, sandwiched between the cover plate and the pole plate; and The first sealant blocking structure is arranged on a side of the sealant close to the through hole to block the sealant from overflowing into the through hole.

2. The top cover assembly according to claim 1, wherein: The outer peripheral wall of the first glue-blocking structure and the inner peripheral wall of the through hole are arranged opposite to each other along the thickness direction of the cover plate, or the first glue-blocking structure is at least partially located between the cover plate and the pole plate.

3. The top cover assembly according to claim 1, wherein: The through hole and the first glue-blocking structure are both circular in shape, and the outer diameter of the first glue-blocking structure is greater than or equal to the inner diameter of the through hole.

4. The top cover assembly according to claim 1, wherein: The first glue blocking structure is at least partially located between the cover plate and the pole plate; the first glue blocking structure is connected to the pole plate, and a first glue overflow gap is formed between the first glue blocking structure and the cover plate, or the first glue blocking structure is connected to the cover plate, and a first glue overflow gap is formed between the first glue blocking structure and the pole plate.

5. The top cover assembly according to claim 4, wherein: The pole plate has a first sealing surface facing the cover plate, the sealant is sandwiched between the first sealing surface and the cover plate, the first sealant blocking structure is connected to the first sealing surface, and in the thickness direction of the cover plate, the width of the first sealant overflow gap is less than or equal to the protruding height of the first sealant blocking structure relative to the first sealing surface.

6. The top cover assembly according to claim 1, wherein: The top cover assembly further includes a first insulating sheet, which is attached to the pole plate and forms the first glue blocking structure.

7. The top cover assembly according to claim 6, wherein: The pole plate has a first sealing surface facing the cover plate. The first sealing surface is further provided with a connecting protrusion at a position corresponding to the through hole. The connecting protrusion is used to electrically connect to the core package in the battery cell. The first insulating sheet is annular and arranged around the connecting protrusion.

8. The top cover assembly according to claim 7, wherein: The inner peripheral wall of the first insulating sheet abuts against the outer peripheral wall of the connecting protrusion.

9. The top cover assembly according to any one of claims 1 to 8, characterized in that: The top cover assembly further includes a second glue blocking structure, which is located on a side of the sealant away from the through hole to limit the sealant from overflowing to a side of the pole plate away from the cover plate.

10. The top cover assembly according to claim 9, wherein: The inner peripheral wall of the second glue blocking structure and the outer peripheral wall of the pole plate are arranged opposite to each other along the thickness direction of the pole plate, or the second glue blocking structure is at least partially located between the cover plate and the pole plate.

11. The top cover assembly according to claim 9, wherein: The pole plate and the second glue blocking structure are both circular in shape, and the inner diameter of the second glue blocking structure is smaller than or equal to the outer diameter of the pole plate.

12. The top cover assembly according to claim 9, wherein: The second glue blocking structure is at least partially located between the cover plate and the pole plate; the second glue blocking structure is connected to the pole plate, and a second glue overflow gap is formed between the second glue blocking structure and the cover plate, or the second glue blocking structure is connected to the cover plate, and a second glue overflow gap is formed between the second glue blocking structure and the cover plate.

13. The top cover assembly according to claim 12, wherein: The cover plate has a second sealing surface facing the pole plate, the sealant is sandwiched between the second sealing surface and the pole plate, the second glue blocking structure is connected to the second sealing surface, and in the thickness direction of the cover plate, the width of the second glue overflow gap is less than or equal to the protruding height of the second glue blocking structure relative to the second sealing surface.

14. The top cover assembly according to claim 9, wherein: The top cover assembly further includes a second insulating sheet, which is attached to the cover plate and forms the second glue blocking structure.

15. The top cover assembly according to any one of claims 1 to 8, characterized in that: The thickness of the cover plate at any position thereof is greater than or equal to 0.05 mm and less than or equal to 1 mm, and / or the thickness of the pole plate at any position thereof is greater than or equal to 0.05 mm and less than or equal to 1 mm.

16. A battery cell, characterized in that: include: A mounting shell having a mounting cavity and an opening communicating with the mounting cavity; A core package is installed in the installation cavity; as well as, The top cover assembly according to any one of claims 1 to 15, wherein the cover plate covers the opening, and the pole plate is electrically connected to the core package at the through hole.

17. A battery pack, characterized in that: Comprising the battery cell as claimed in claim 16.

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