Battery cell cover plate assembly, battery cell, and battery pack

Abstract

The utility model relates to battery technical field discloses the electric core cover plate subassembly, electric core and battery package, wherein the electric core cover plate subassembly mainly includes: cover plate, explosion -proof valve and protection patch. Cover plate is equipped with through -hole along its thickness direction, and the upper surface of cover plate is equipped with annular protruding along the circumferential side of through -hole, explosion -proof valve is equipped in through -hole, protection patch includes patch body and adhesive layer, and patch body is fixedly bonded with annular protruding through adhesive layer, and patch body covers through -hole, and patch body extends downward along the outer peripheral wall of annular protruding and forms flanging. The utility model sets up annular protruding along the circumferential side of through -hole on the upper surface of cover plate, and sets up patch body on annular protruding through adhesive layer, can lift the installation height of patch body, utilizes annular protruding, adhesive layer and flanging to block electrolyte or dust and other foreign matters to enter explosion -proof valve, avoids the pollution damage of explosion -proof valve, and the safety and reliability of electric core have been improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cell cover assembly, a cell, and a battery pack. Background Technology

[0002] Currently, the cover plate assembly of the battery cell is usually equipped with an explosion-proof valve for pressure relief, and a protective patch is installed above the corresponding explosion-proof valve on the cover plate to protect the explosion-proof valve and prevent dust, electrolyte and other substances from contaminating the explosion-proof valve.

[0003] Protective patches are typically attached to the upper surface of the cover plate using adhesive. However, gaps can easily form at the connection between the protective patch and the cover plate, allowing foreign matter such as electrolyte or dust to enter the explosion-proof valve, causing contamination and damage. Utility Model Content

[0004] In view of this, the present invention provides a cell cover assembly, a cell, and a battery pack to solve the problem that foreign matter such as electrolyte or dust can easily enter the explosion-proof valve through the connection gap between the protective patch and the cover, causing the explosion-proof valve to be contaminated and damaged.

[0005] In a first aspect, this utility model provides a battery cell cover assembly, comprising:

[0006] A cover plate has a through hole along its thickness direction, and the upper surface of the cover plate has an annular protrusion along the periphery of the through hole;

[0007] An explosion-proof valve is disposed within the through hole;

[0008] The protective patch includes a patch body and an adhesive layer. The patch body is fixedly bonded to the annular protrusion by the adhesive layer, and the patch body covers the through hole. The patch body extends downward along the outer peripheral wall of the annular protrusion in a direction perpendicular to the thickness of the cover plate and forms a flange.

[0009] Beneficial effects: The battery cell cover assembly of this utility model utilizes the patch body of the protective patch to cover the through hole of the explosion-proof valve, which can effectively protect the explosion-proof valve. An annular protrusion is provided on the upper surface of the cover plate along the periphery of the through hole, and the patch body is set on the annular protrusion through an adhesive layer, which can raise the installation height of the patch body. The outer peripheral wall of the annular protrusion forms a blocking step, preventing electrolyte from flowing from near the injection hole to the patch body and into the explosion-proof valve. Furthermore, the adhesive layer and the flange further prevent electrolyte or foreign objects such as dust from entering the explosion-proof valve, thereby avoiding contamination and damage to the explosion-proof valve, and significantly improving the safety and reliability of the battery cell.

[0010] In one optional embodiment, the thickness of the patch body is H1, satisfying 0.05mm≤H1≤0.3mm;

[0011] And / or, the thickness of the flange is H2, satisfying 0.05mm≤H2≤0.3mm;

[0012] And / or, the thickness of the annular protrusion in the thickness direction of the cover plate is H3, satisfying 0.3mm≤H3≤1mm.

[0013] Beneficial effects: By controlling the thickness of the patch body and the flange within a suitable range, sufficient structural strength can be ensured for both the patch body and the flange without occupying excessive space. Similarly, by controlling the thickness of the annular protrusion in the cover plate's thickness direction within a suitable range, sufficient blocking height can be ensured on the outer periphery of the annular protrusion to prevent electrolyte from flowing from near the injection hole to the patch body and into the explosion-proof valve. If the thickness of the annular protrusion is too small, electrolyte can easily flow from near the injection hole to the patch body and into the explosion-proof valve; if the thickness is too large, it wastes material and occupies too much space.

[0014] In one optional embodiment, the adhesive layer includes a first sub-adhesive layer and a second sub-adhesive layer, wherein the first sub-adhesive layer is sandwiched between the top wall of the annular protrusion and the patch body, and the second sub-adhesive layer is sandwiched between the outer peripheral wall of the annular protrusion and the flange.

[0015] Beneficial effects: The first sub-adhesive layer is used to fix and bond the patch body to the annular protrusion, and the second sub-adhesive layer is used to fix and bond the annular protrusion to the flange. By using two layers of adhesive to fix the patch body and the flange respectively, the connection is firm and the blocking effect of foreign objects such as electrolyte or dust is better.

[0016] In one optional embodiment, the thickness of the first sub-adhesive layer is H4, satisfying 0.05mm≤H4≤0.15mm;

[0017] And / or, the thickness of the second sub-adhesive layer is H5, satisfying 0.05mm≤H5≤0.15mm.

[0018] Beneficial effects: By controlling the thickness of the first sub-adhesive layer and / or the second sub-adhesive layer within a suitable range, it can be ensured that the first sub-adhesive layer fully fills the gap between the patch body and the annular protrusion and / or the gap between the annular protrusion and the flange, preventing electrolyte from seeping in.

[0019] In one optional embodiment, the first sub-adhesive layer covers the top surface of the annular protrusion with its orthogonal projection toward the annular protrusion. Along a direction perpendicular to the thickness of the cover plate, the width of the annular protrusion is L1, satisfying 0.5mm≤L1≤2mm, and the width of the first sub-adhesive layer is L2, satisfying 0.5mm≤L2≤2mm.

[0020] Beneficial effects: The first sub-adhesive layer, projected orthogonally towards the annular protrusion, covers the top surface of the annular protrusion, meaning the first sub-adhesive layer completely fills the top surface of the annular protrusion. This ensures a seamless connection between the top surface of the annular protrusion and the patch body, further preventing foreign matter such as electrolyte or dust from entering the explosion-proof valve between the annular protrusion and the patch body. By controlling the width of the annular protrusion and the first sub-adhesive layer within a suitable range, sufficient contact area between the annular protrusion and the patch body can be ensured, improving the installation stability of the patch body.

[0021] In one alternative embodiment, the first sub-adhesive layer extends along the top wall of the annular protrusion to form an annulus;

[0022] And / or, the second sub-adhesive layer extends along the outer peripheral wall of the annular protrusion to form an annulus.

[0023] Beneficial effect: Setting the first sub-adhesive layer and / or the second sub-adhesive layer into an annular shape can form a barrier layer, further preventing foreign objects such as electrolyte or dust from entering the explosion-proof valve between the annular protrusion and the protective patch.

[0024] In one alternative embodiment, the flange extends to the upper surface of the cover plate.

[0025] Beneficial effects: Extending the flange to the upper surface of the cover plate, meaning the bottom of the flange contacts the upper surface of the cover plate, and creating a seamless connection between the flange and the cover plate, further prevents foreign matter such as electrolyte or dust from entering the explosion-proof valve through the annular protrusion and the protective patch. Simultaneously, it also disperses the stress on the flange to the cover plate, reducing the risk of adhesive layer cracking.

[0026] In one alternative embodiment, the patch body and the adhesive layer are set to different colors.

[0027] Beneficial effects: By setting the patch body and adhesive layer to different colors, it is easy for machines to detect and identify, ensuring that the protective patch is applied to the cover plate and avoiding missing protective patches.

[0028] In one alternative embodiment, the patch body has at least one slit, which communicates with the through hole.

[0029] Beneficial effects: By setting slits, the gas released from inside the battery cell can be released to the outside through the slits, while the explosion-proof valve can be covered by the protective patch, thus better protecting the explosion-proof valve.

[0030] Secondly, this utility model also provides a battery cell, comprising:

[0031] The housing has an opening at at least one end;

[0032] The aforementioned cell cover assembly has the cover plate positioned over the opening and connected to the housing.

[0033] Beneficial effects: The battery cell of this utility model utilizes the protective patch body to cover the through hole of the explosion-proof valve, which can effectively protect the explosion-proof valve. An annular protrusion is set on the upper surface of the cover plate along the periphery of the through hole, and the patch body is set on the annular protrusion through an adhesive layer, which can raise the installation height of the patch body. The outer peripheral wall of the annular protrusion forms a blocking step, preventing the electrolyte from flowing from near the injection hole to the patch body and into the explosion-proof valve. The adhesive layer and the flange further prevent electrolyte or foreign objects such as dust from entering the explosion-proof valve, thereby avoiding contamination and damage to the explosion-proof valve, and significantly improving the safety and reliability of the battery cell.

[0034] Thirdly, the present invention also provides a battery pack, comprising: at least one of the above-mentioned battery cells.

[0035] Beneficial effects: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be repeated here. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the structure of a battery cell cover assembly according to an embodiment of the present utility model;

[0038] Figure 2 for Figure 1 Top view;

[0039] Figure 3 for Figure 2 Sectional view at point AA;

[0040] Figure 4 for Figure 3 Enlarged view of point C in the image;

[0041] Figure 5 This is a schematic diagram of a protective patch for a battery cell cover assembly according to an embodiment of the present utility model;

[0042] Figure 6 for Figure 5 Top view;

[0043] Figure 7 for Figure 6 Sectional view at point BB.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Cover plate; 101. Through hole; 102. Annular protrusion; 103. Pole post; 104. Injection hole; 2. Explosion-proof valve; 3. Protective patch; 301. Patch body; 302. Adhesive layer; 3021. First sub-adhesive layer; 3022. Second sub-adhesive layer; 303. Flanged edge; 304. Cut seam. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] In this embodiment of the invention, a "cell" refers to a single battery cell capable of independent charging and discharging. The components of a cell may include a positive electrode, a negative electrode, a separator, an electrolyte, and outer packaging for encapsulating the positive electrode, negative electrode, separator, and electrolyte. This embodiment of the invention does not impose any particular limitations on the type or shape of the cell; it can be a pouch cell, a cylindrical cell, a prismatic cell, or any other type of cell. The cell in this embodiment of the invention can be a lithium-ion cell, a potassium-ion cell, a sodium-ion cell, a lithium-sulfur cell, etc., with lithium-ion cells being particularly preferred. During the charging and discharging process, active ions repeatedly insert and extract between the positive and negative electrode plates. The electrolyte acts as a conductor of ions between the positive and negative electrode plates.

[0048] In this embodiment of the utility model, the "explosion-proof valve" refers to a structure that rapidly releases pressure when the internal pressure of the battery cell rises abnormally, preventing explosion or thermal runaway. It can be a mechanical explosion-proof valve or a composite explosion-proof valve.

[0049] The following is combined with Figures 1 to 7 The following describes embodiments of the present invention.

[0050] According to embodiments of the present invention, on the one hand, such as Figures 1 to 3As shown, a battery cell cover assembly is provided, mainly including: a cover plate 1, an explosion-proof valve 2, and a protective patch 3. The cover plate 1 has a through hole 101 along its thickness direction, and an annular protrusion 102 is provided on the upper surface of the cover plate 1 along the periphery of the through hole 101. The explosion-proof valve 2 is disposed in the through hole 101. The protective patch 3 includes a patch body 301 and an adhesive layer 302. The patch body 301 is fixedly bonded to the annular protrusion 102 by the adhesive layer 302, and the patch body 301 covers the through hole 101. The patch body 301 extends downward along the outer peripheral wall of the annular protrusion 102 in a direction perpendicular to the thickness of the cover plate 1 to form a flange 303.

[0051] Therefore, the battery cell cover assembly provided in this embodiment of the present invention can effectively protect the explosion-proof valve 2 by using the patch body 301 of the protective patch 3 to cover the through hole 101 of the explosion-proof valve 2. An annular protrusion 102 is provided on the upper surface of the cover plate 1 along the periphery of the through hole 101, and the patch body 301 is placed on the annular protrusion 102 through the adhesive layer 302, which can raise the installation height of the patch body 301. The outer peripheral wall of the annular protrusion 102 forms a blocking step, which prevents the electrolyte from flowing from near the injection hole 104 to the patch body 301 and into the explosion-proof valve 2. Furthermore, the adhesive layer 302 and the flange 303 further prevent the electrolyte or foreign matter such as dust from entering the explosion-proof valve 2, thereby avoiding contamination and damage to the explosion-proof valve 2 and significantly improving the safety and reliability of the battery cell.

[0052] Specifically, the thickness direction of the cover plate 1, which is also the thickness direction of the patch body 301, i.e., the vertical direction, is as follows: Figure 1 As indicated by arrow H in the diagram. Figure 1 and Figure 2 As shown, the upper surface of the cover plate 1 is also provided with an injection hole 104 for injecting electrolyte into the battery cell. This injection hole can be located in any direction perpendicular to the thickness of the cover plate 1, i.e., in the plane formed by the length and width directions of the cover plate 1. The length direction of the cover plate 1 is as follows: Figure 1 As shown by arrow L in the diagram, the width direction of cover plate 1 is as follows: Figure 1 As indicated by the arrow W in the diagram.

[0053] The battery cell cover assembly of this utility model is installed on the opening of the battery cell housing and connected to the housing. The side of the cover 1 located inside the housing along the thickness direction serves as the lower surface, and the opposite side located outside the housing serves as the upper surface.

[0054] It should be noted that this embodiment of the invention does not limit the material of the patch body 301. For example, the patch body 301 can be made of plastic materials such as PET (polyethylene terephthalate), PP (polypropylene), or PC (polycarbonate). The shape of the patch body 301 can be set according to the explosion-proof valve 2. For example, if the explosion-proof valve 2 has a cross-sectional structure of a track and field track, then the patch body 301 can be set to a cross-sectional structure of a track and field track.

[0055] Furthermore, there are no restrictions on the material of the adhesive layer 302. For example, the adhesive layer 302 can be made of pressure-sensitive adhesive, which has greater bonding strength and a firm connection.

[0056] In one embodiment, such as Figure 4 As shown, the thickness of the patch body 301 is H1, satisfying 0.05mm ≤ H1 ≤ 0.3mm. And / or, the thickness of the flange 303 is H2, satisfying 0.05mm ≤ H2 ≤ 0.3mm. The thickness direction of the patch body 301 is perpendicular to the thickness direction of the flange 303. Along the thickness direction perpendicular to the cover plate 1, the flange 303 has a uniform wall thickness. By controlling the thickness dimensions of the patch body 301 and the flange 303 within a suitable range, it can be ensured that the patch body 301 and the flange 303 have sufficient structural strength and do not occupy too much space.

[0057] Specifically, the thickness of the flange 303 is generally the same as the thickness of the patch body 301. For example, the thickness H1 of the patch body 301 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc. Similarly, the thickness H2 of the flange 303 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, etc.

[0058] In one embodiment, such as Figure 4 As shown, the thickness of the annular protrusion 102 in the thickness direction of the cover plate 1 is H3, satisfying 0.3mm≤H3≤1mm. By controlling the thickness of the annular protrusion 102 in the thickness direction of the cover plate 1 within a suitable range, it can be ensured that the outer peripheral wall of the annular protrusion 102 has sufficient blocking height to prevent electrolyte from flowing from near the injection hole 104 to the patch body 301 and into the explosion-proof valve 2. If the thickness of the annular protrusion 102 is too small, electrolyte can easily flow from near the injection hole 104 to the patch body 301 and into the explosion-proof valve 2; if the thickness of the annular protrusion 102 is too large, it will waste material and occupy a large space.

[0059] For example, the thickness H3 of the annular protrusion 102 in this embodiment of the present invention can be 0.3mm, 0.6mm, 0.8mm, 1mm, etc.

[0060] In one embodiment, such as Figure 4 and Figure 7As shown, adhesive layer 302 includes a first sub-adhesive layer 3021 and a second sub-adhesive layer 3022. The first sub-adhesive layer 3021 is sandwiched between the top wall of the annular protrusion 102 and the patch body 301, and the second sub-adhesive layer 3022 is sandwiched between the outer peripheral wall of the annular protrusion 102 and the flange 303. The first sub-adhesive layer 3021 is used to fix and bond the patch body 301 and the annular protrusion 102, and the second sub-adhesive layer 3022 is used to fix and bond the annular protrusion 102 and the flange 303. By using the two adhesive layers 302 to fix the patch body 301 and the flange 303 respectively, the connection is firm and the blocking effect of foreign objects such as electrolyte or dust is better.

[0061] Furthermore, in one embodiment, such as Figure 4 As shown, the thickness of the first sub-adhesive layer 3021 is H4, satisfying 0.05mm≤H4≤0.15mm. The thickness direction of the first sub-adhesive layer 3021 is consistent with the thickness direction of the cover plate 1.

[0062] And / or, the thickness of the second sub-adhesive layer 3022 is H5, satisfying 0.05mm≤H5≤0.15mm. The thickness direction of the second sub-adhesive layer 3022 is perpendicular to the thickness direction of the cover plate 1.

[0063] By controlling the thickness of the first sub-adhesive layer 3021 and / or the second sub-adhesive layer 3022 within a suitable range, it can be ensured that the first sub-adhesive layer 3021 fully fills the gap between the patch body 301 and the annular protrusion 102 and / or the gap between the annular protrusion 102 and the flange 303, preventing electrolyte from seeping in.

[0064] It should be noted that the thicknesses of the first sub-adhesive layer 3021 and the second sub-adhesive layer 3022 can be equal. For example, the thickness H4 of the first sub-adhesive layer 3021 can be 0.05mm, 0.1mm, 0.15mm, etc., and the thickness H5 of the second sub-adhesive layer 3022 can be 0.05mm, 0.1mm, 0.15mm, etc.

[0065] Furthermore, in one embodiment, such as Figure 4 As shown, the orthographic projection of the first sub-adhesive layer 3021 onto the annular protrusion 102 covers the top surface of the annular protrusion 102. Along the direction perpendicular to the thickness of the cover plate 1, the width of the annular protrusion 102 is L1, satisfying 0.5mm ≤ L1 ≤ 2mm, and the width of the first sub-adhesive layer 3021 is L2, satisfying 0.5mm ≤ L2 ≤ 2mm. Along the direction perpendicular to the thickness of the cover plate 1, the annular protrusion 102 has a uniform width, meaning that the dimensions of the annular protrusion 102 are consistent in both the length and width directions of the cover plate 1.

[0066] The first sub-adhesive layer 3021, with its orthographic projection facing the annular protrusion 102, covers the top surface of the annular protrusion 102, meaning the first sub-adhesive layer 3021 completely fills the top surface of the annular protrusion 102. This ensures a seamless connection between the top surface of the annular protrusion 102 and the patch body 301, further preventing foreign matter such as electrolyte or dust from entering the explosion-proof valve 2 between the annular protrusion 102 and the patch body 301. By controlling the widths of the annular protrusion 102 and the first sub-adhesive layer 3021 within a suitable range, sufficient contact area between the annular protrusion 102 and the patch body 301 can be ensured, improving the installation stability of the patch body 301.

[0067] Since the orthographic projection of the first sub-adhesive layer 3021 toward the annular protrusion 102 covers the top surface of the annular protrusion 102, the width of the annular protrusion 102 is equal to the width of the first sub-adhesive layer 3021 along the direction perpendicular to the thickness of the cover plate 1. For example, the width L1 of the annular protrusion 102 can be 0.5mm, 1mm, 1.5mm, 2mm, etc., and the width L2 of the first sub-adhesive layer 3021 can be 0.5mm, 1mm, 1.5mm, 2mm, etc.

[0068] Furthermore, in one embodiment, the first sub-adhesive layer 3021 extends along the top wall of the annular protrusion 102 to form an annulus. And / or, the second sub-adhesive layer 3022 extends along the outer peripheral wall of the annular protrusion 102 to form an annulus. By configuring the first sub-adhesive layer 3021 and / or the second sub-adhesive layer 3022 as annulus, a barrier layer can be formed, further preventing foreign matter such as electrolyte or dust from entering the explosion-proof valve 2 between the annular protrusion 102 and the protective patch 3.

[0069] In one embodiment, the flange 303 extends to the upper surface of the cover plate 1, that is, the bottom of the flange 303 contacts the upper surface of the cover plate 1, and there is no gap between the flange 303 and the cover plate 1, further preventing foreign objects such as electrolyte or dust from entering the explosion-proof valve 2 between the annular protrusion 102 and the protective patch 3. At the same time, it can also disperse the stress on the flange 303 to the cover plate 1, reducing the risk of cracking of the adhesive layer 302.

[0070] In one embodiment, the patch body 301 and the adhesive layer 302 are set to different colors, which facilitates machine detection and identification, ensuring that the protective patch 3 is attached to the cover plate 1 and preventing the protective patch 3 from being missed. For example, the patch body 301 is red and the adhesive layer 302 is green.

[0071] In one embodiment, such as Figure 5 and Figure 6As shown, the patch body 301 has at least one slit 304, which communicates with the through hole 101. By setting the slit 304, the gas released from inside the battery cell can be released to the outside through the slit 304, while the explosion-proof valve 2 can be covered by the protective patch 3, thus better protecting the explosion-proof valve 2.

[0072] It should be noted that the present invention does not limit the number of slits 304, and one, two or more can be selected as needed.

[0073] According to an embodiment of the present invention, another aspect provides a battery cell, comprising: a housing and a battery cell cover assembly. The housing has an opening at at least one end. A cover plate 1 of the battery cell cover assembly is disposed over the opening and connected to the housing.

[0074] Therefore, it can be seen that the battery cell of this utility model embodiment, by using the patch body 301 of the protective patch 3 to cover the through hole 101 of the explosion-proof valve 2, can better protect the explosion-proof valve 2. An annular protrusion 102 is provided on the upper surface of the cover plate 1 along the periphery of the through hole 101, and the patch body 301 is set on the annular protrusion 102 through the adhesive layer 302, which can raise the installation height of the patch body 301. The outer peripheral wall of the annular protrusion 102 forms a blocking step, which prevents the electrolyte from flowing from near the injection hole 104 to the patch body 301 and into the explosion-proof valve 2. Furthermore, the adhesive layer 302 and the flange 303 further prevent the electrolyte or foreign objects such as dust from entering the explosion-proof valve 2, thereby avoiding the explosion-proof valve 2 from being contaminated and damaged, and significantly improving the safety and reliability of the battery cell.

[0075] Specifically, the casing contains an electrode assembly, which includes a positive electrode and a negative electrode. For example... Figure 1 and Figure 2 As shown, the cover plate 1 is also provided with a terminal post 103. The upper end of the terminal post 103 passes through the cover plate 1 and is electrically connected to the busbar, and the lower end is electrically connected to the electrode group. The terminal post 103 includes a positive terminal post and a negative terminal post. The positive tab on the positive electrode plate is electrically connected to the positive terminal post through a positive connecting piece, and the negative tab on the negative electrode plate is electrically connected to the negative terminal post through a negative connecting piece.

[0076] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising: at least one battery cell.

[0077] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated on here.

[0078] To achieve the basic functions of the battery pack, the battery pack in this embodiment may also include other necessary modules or components, such as a battery management system and a heat dissipation system. It should be noted that any suitable existing structure can be selected from the other necessary modules or components included in the battery pack. To clearly and concisely illustrate the technical solution provided in this embodiment, the above-mentioned parts will not be repeated here, and the accompanying drawings have also been simplified accordingly. However, it should be understood that the scope of the embodiments of this utility model is not limited thereto.

[0079] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A cell cover assembly, characterized in that, include: A cover plate has a through hole along its thickness direction, and the upper surface of the cover plate has an annular protrusion along the periphery of the through hole; An explosion-proof valve is disposed within the through hole; The protective patch includes a patch body and an adhesive layer. The patch body is fixedly bonded to the annular protrusion by the adhesive layer, and the patch body covers the through hole. The patch body extends downward along the outer peripheral wall of the annular protrusion in a direction perpendicular to the thickness of the cover plate and forms a flange.

2. The cell cover assembly according to claim 1, characterized in that, The thickness of the patch body is H1, which satisfies 0.05mm≤H1≤0.3mm; And / or, the thickness of the flange is H2, satisfying 0.05mm≤H2≤0.3mm; And / or, the thickness of the annular protrusion in the thickness direction of the cover plate is H3, satisfying 0.3mm≤H3≤1mm.

3. The cell cover assembly according to claim 1, characterized in that, The adhesive layer includes a first sub-adhesive layer and a second sub-adhesive layer. The first sub-adhesive layer is sandwiched between the top wall of the annular protrusion and the patch body, and the second sub-adhesive layer is sandwiched between the outer peripheral wall of the annular protrusion and the flange.

4. The cell cover assembly according to claim 3, characterized in that, The thickness of the first sub-adhesive layer is H4, which satisfies 0.05mm≤H4≤0.15mm; And / or, the thickness of the second sub-adhesive layer is H5, satisfying 0.05mm≤H5≤0.15mm.

5. The cell cover assembly according to claim 4, characterized in that, The first sub-adhesive layer, with its orthographic projection toward the annular protrusion, covers the top surface of the annular protrusion. Along a direction perpendicular to the thickness of the cover plate, the width of the annular protrusion is L1, satisfying 0.5mm≤L1≤2mm, and the width of the first sub-adhesive layer is L2, satisfying 0.5mm≤L2≤2mm.

6. The cell cover assembly according to claim 3, characterized in that, The first sub-adhesive layer extends along the top wall of the annular protrusion to form an annular shape; And / or, the second sub-adhesive layer extends along the outer peripheral wall of the annular protrusion to form an annulus.

7. The cell cover assembly according to any one of claims 1 to 6, characterized in that, The flange extends to the upper surface of the cover plate.

8. The cell cover assembly according to any one of claims 1 to 6, characterized in that, The patch body and the adhesive layer are respectively set to different colors; And / or, the patch body has at least one slit, the slit communicating with the through hole.

9. A battery cell, characterized in that, include: The housing has an opening at at least one end; The cell cover assembly according to any one of claims 1 to 8, wherein the cover is disposed over the opening and connected to the housing.

10. A battery pack, characterized in that, include: At least one battery cell as described in claim 9.

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