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 the through -hole along Z direction penetration, explosion -proof valve is located in the through -hole, protection patch includes patch body and dyed rubber layer, and dyed rubber layer is bonded in the lower surface of patch body along Z direction, and patch body is transparent piece, and patch body is fixedly bonded with the upper surface of cover plate through dyed rubber layer and covers the through -hole, and the projection of dyed rubber layer on X Y plane falls into the range of the projection of patch body on X Y plane. The utility model discloses protection patch protection explosion -proof valve, and the color of dyed rubber layer is convenient for machine to identify whether patch body is pasted, thereby can avoid protection patch missing pasting, in addition, the projection of dyed rubber layer on X Y plane falls into the range of the projection of patch body on X Y plane, can avoid dyed rubber layer overflow glue.

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, battery cell cover assemblies are typically equipped with explosion-proof valves for pressure relief, and protective patches are installed on the explosion-proof valves to prevent dust, electrolyte, and other contaminants from contaminating them.

[0003] In existing solutions, protective patches are generally designed to be transparent and colorless to facilitate observation of explosion-proof valves. However, when machines detect whether protective patches are installed on explosion-proof valves, the transparency of the transparent and colorless protective patches is low, which can easily lead to the risk of missing protective patches. Utility Model Content

[0004] In view of this, the present invention provides a cell cover plate assembly, a cell, and a battery pack to solve the problem that the transparent and colorless protective patch is difficult to be detected and identified by the machine, resulting in the protective patch being easily missed.

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

[0006] The cover plate has a through hole running through it in the Z direction;

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

[0008] A protective patch includes a patch body and a dyed adhesive layer. The dyed adhesive layer is bonded to the lower surface of the patch body along the Z direction. The patch body is transparent. The patch body is fixedly bonded to the upper surface of the cover plate and covers the through hole through the dyed adhesive layer. The projection of the dyed adhesive layer on the XY plane falls within the range of the projection of the patch body on the XY plane.

[0009] Beneficial Effects: The battery cell cover assembly of this invention protects the explosion-proof valve by covering the through-hole with the protective patch body, preventing contamination from external dust and electrolyte. The patch body is transparent, facilitating observation of the explosion-proof valve and inspection of the dyed adhesive layer. The dyed adhesive layer connects the protective patch and the cover plate, and its color is easily detected and identified by machines, ensuring the protective patch is properly mounted on the cover plate and preventing missed mounting. Furthermore, the projection of the dyed adhesive layer onto the XY plane falls within the projection range of the patch body onto the XY plane, reducing the risk of adhesive overflow.

[0010] In one optional embodiment, the dyeing adhesive layer is annular and is arranged circumferentially around the through hole. Along the X direction, the size of the part of the dyeing adhesive layer that is bonded to the cover plate is W1, which satisfies W1≥0.5mm.

[0011] And / or, along the Y direction, the dimension of the part where the dyed adhesive layer is bonded to the cover plate is W2, which satisfies W2≥0.5mm.

[0012] Beneficial effects: By controlling the dimensions of the bonding areas between the dyed adhesive layer and the cover plate in the X and Y directions within a suitable range, it is possible to ensure that there is a sufficiently large bonding area between the dyed adhesive layer and the cover plate, thereby ensuring the connection strength between the protective patch and the cover plate and preventing the protective patch from falling off.

[0013] In one optional embodiment, on the XY plane, the outer contour of the patch body is larger than the outer contour of the dyed adhesive layer, and the distance between the outer contour of the patch body and the outer contour of the dyed adhesive layer is L1, satisfying 0.05mm≤L1≤0.3mm.

[0014] Beneficial effects: On the XY plane, the outer contour of the patch body is larger than the outer contour of the stained adhesive layer, which allows for excess adhesive space between the outer contours of the patch body and the recognition body, preventing the adhesive layer from overflowing beyond the patch body and affecting the assembly of the cover plate. If L1 is too small, excess adhesive is likely to occur; if L1 is too large, it wastes material from the patch body and occupies space.

[0015] In one optional embodiment, the dimension of the dyeing adhesive layer along the Z direction is T1, which satisfies 0.05mm≤T1≤0.2mm.

[0016] Beneficial effects: By controlling the thickness T1 of the dyed adhesive layer within a suitable range, the bonding strength between the protective patch and the cover plate can be further ensured. If T1 is too small, the bonding strength will be low; if T1 is too large, adhesive overflow is likely to occur.

[0017] In one optional embodiment, the dimension of the patch body along the Z direction is T2, which satisfies 0.05mm≤T2≤0.5mm.

[0018] Beneficial effects: By controlling the thickness T2 of the patch body within a suitable range, the strength of the patch body itself can be ensured. If T2 is too small, the strength of the patch body will be insufficient; if T2 is too large, it will waste materials and occupy space.

[0019] In one optional embodiment, the dyed adhesive layer has a first surface and a second surface disposed opposite to each other along the Z direction, the first surface being fixedly bonded to the patch body, and the second surface being partially bonded to the cover plate.

[0020] Beneficial effects: The first side of the dyed adhesive layer is fully bonded to the patch body to improve the bonding strength between the dyed adhesive layer and the patch body. The second side of the dyed adhesive layer is partially bonded to the cover plate, and the other part is located above the through hole as a compensation area to compensate for the installation error when the dyed adhesive layer is bonded to the cover plate, and to avoid the width of the bonded part of the dyed adhesive layer to the cover plate being too small or the bonding width being uneven.

[0021] In one optional embodiment, the patch body is provided with at least one vent hole extending through the Z direction, and the vent hole communicates with the through hole.

[0022] Beneficial effect: The vent is used to release the gas generated inside the battery cell during daily use, preventing excessive gas inside the battery cell from affecting the normal use of the explosion-proof valve.

[0023] In one alternative embodiment, the dyeing adhesive layer includes a transparent dyeing adhesive layer or a non-transparent dyeing adhesive layer.

[0024] Beneficial effects: Setting the dyed adhesive layer to be transparent or non-transparent makes it easy for machines to detect and identify, ensuring that the protective patch is applied to the cover plate and avoiding missing protective patches.

[0025] Secondly, this utility model also provides a battery cell, comprising:

[0026] The housing has an opening at at least one end;

[0027] The aforementioned cell cover assembly has the cover plate placed over the opening and connected to the housing.

[0028] Beneficial effects: The battery cell of this invention protects the explosion-proof valve by covering the through-hole with the protective patch body, preventing external dust and electrolyte from contaminating the valve. The patch body is transparent, facilitating observation of the explosion-proof valve and inspection of the dyed adhesive layer. The dyed adhesive layer connects the protective patch and the cover plate, and its color is easily detected and identified by machines, ensuring the protective patch is properly mounted on the cover plate and preventing missed mounting. Furthermore, the projection of the dyed adhesive layer onto the XY plane falls within the projection range of the patch body onto the XY plane, reducing the risk of adhesive overflow.

[0029] Thirdly, the present invention also provides a battery pack, comprising: at least one of the above-mentioned battery cells.

[0030] 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

[0031] 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.

[0032] 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;

[0033] Figure 2 This is a front view of a battery cell cover assembly according to an embodiment of the present utility model;

[0034] Figure 3 for Figure 2 A sectional view along line AA.

[0035] Figure 4 for Figure 3 Enlarged view of point C in the image;

[0036] Figure 5 for Figure 2 Sectional view along line BB;

[0037] Figure 6 for Figure 5 Enlarged view of point D in the image.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Cover plate; 101. Through hole; 102. Pole post; 103. Injection hole; 2. Explosion-proof valve; 3. Protective patch; 301. Patch body; 302. Dyed adhesive layer; 303. Vent hole. Detailed Implementation

[0040] 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.

[0041] In the embodiments of this utility model, "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 utility model does not impose 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 utility model 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 battery charging and discharging, 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.

[0042] In the embodiments of this 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.

[0043] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0044] According to embodiments of the present invention, on the one hand, such as Figure 1 As 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 extending along the Z direction. The explosion-proof valve 2 is disposed within the through hole 101. The protective patch 3 includes a patch body 301 and a dyed adhesive layer 302, the dyed adhesive layer 302 being bonded to the lower surface of the patch body 301 along the Z direction. The patch body 301 is a transparent part, and the patch body 301 is fixedly bonded to the upper surface of the cover plate 1 by the dyed adhesive layer 302 and covers the through hole 101. The projection of the dyed adhesive layer 302 on the XY plane falls within the range of the projection of the patch body 301 on the XY plane.

[0045] Therefore, the battery cell cover assembly provided in this embodiment of the present invention protects the explosion-proof valve 2 by covering the through hole 101 with the patch body 301 of the protective patch 3, preventing external dust and electrolyte from contaminating the explosion-proof valve 2. The patch body 301 is transparent, facilitating observation of the explosion-proof valve 2 and detection of the dyed adhesive layer 302. The dyed adhesive layer 302 is used to connect the protective patch 3 and the cover plate 1. Simultaneously, the color of the dyed adhesive layer 302 is easily detected and identified by the machine, ensuring that the protective patch 3 is properly attached to the cover plate 1 and preventing any omissions. Furthermore, the projection of the dyed adhesive layer 302 onto the XY plane falls within the projection range of the patch body 301 onto the XY plane, further reducing the risk of adhesive overflow.

[0046] Specifically, the Z direction is the vertical direction of the cell cover assembly, which is also the thickness direction of cover 1, such as... Figure 1As indicated by arrow Z in the diagram. The X direction is also the length direction of the cell cover assembly, as shown in... Figure 1 and Figure 2 As indicated by arrow X, the Y direction is also the width direction of the cell cover assembly, as shown in the image. Figure 1 and Figure 2 As indicated by arrow Y. The XY plane is the plane formed by the X and Y directions. The dyed adhesive layer 302 is a colored fixing adhesive layer. The dyed adhesive layer 302 is attached to the upper surface of the cover plate 1 and surrounds the through hole 101. The through hole 101 is used for venting of the explosion-proof valve 2. The protective patch 3 is located on the upper side of the explosion-proof valve 2.

[0047] It should be noted that the cell cover assembly is placed over the opening of the cell housing and connected to the housing. The side of the cover 1 located inside the housing along the Z direction serves as the lower surface, and the opposite side located outside the housing serves as the upper surface.

[0048] It should be noted that the shape of the protective patch 3 is not limited in this embodiment of the invention. Any existing shape can be selected as needed. For example, the patch body 301 can have a track-track shaped cross section, and the dyed adhesive layer 302 can have a track-track shaped annular structure. Similarly, the through hole 101 can also have a track-track shaped cross section.

[0049] Furthermore, 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 PE (polyethylene).

[0050] In one embodiment, such as Figure 1 and Figure 4 As shown, the dyeing adhesive layer 302 is annular and is arranged around the circumference of the through hole 101. Along the X direction, the size of the part where the dyeing adhesive layer 302 is bonded to the cover plate 1 is W1, which satisfies W1≥0.5mm.

[0051] And / or, such as Figure 5 and Figure 6 As shown, along the Y direction, the dimension of the part where the dyed adhesive layer 302 is bonded to the cover plate 1 is W2, which satisfies W2≥0.5mm.

[0052] By controlling the width of the bonding area between the dyed adhesive layer 302 and the cover plate 1 in the X and Y directions within a suitable range, it is possible to ensure that the dyed adhesive layer 302 and the cover plate 1 have a sufficiently large bonding area, thereby ensuring the connection strength between the protective patch 3 and the cover plate 1 and preventing the protective patch 3 from falling off.

[0053] Furthermore, on the XY plane, the widths of the portions where the dyed adhesive layer 302 is bonded to the cover plate 1 are evenly distributed.

[0054] For example, along the X direction, the dimension W1 of the bonding portion between the dyed adhesive layer 302 and the cover plate 1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc. Along the Y direction, the dimension W2 of the bonding portion between the dyed adhesive layer 302 and the cover plate 1 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, etc.

[0055] In one embodiment, such as Figure 4 As shown, on the XY plane, the outer contour of the patch body 301 is larger than the outer contour of the dyed adhesive layer 302, and the distance between the outer contour of the patch body 301 and the outer contour of the dyed adhesive layer 302 is L1, which satisfies 0.05mm≤L1≤0.3mm.

[0056] On the XY plane, the outer contour of the patch body 301 is larger than the outer contour of the dyed adhesive layer 302, which allows for excess adhesive space between the outer contour of the patch body 301 and the outer contour of the recognition body, preventing the adhesive layer from overflowing beyond the patch body 301 and affecting the assembly of the cover plate 1. If L1 is too small, excess adhesive is likely to occur; if L1 is too large, it will waste material of the patch body 301 and occupy space.

[0057] For example, the distance L1 between the outer contour of the patch body 301 and the outer contour of the dyed adhesive layer 302 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 dimension of the dyed adhesive layer 302 along the Z direction is T1, satisfying 0.05mm≤T1≤0.2mm. By controlling the thickness T1 of the dyed adhesive layer 302 within a suitable range, the connection strength between the protective patch 3 and the cover plate 1 can be further ensured. If T1 is too small, the bonding strength will be low; if T1 is too large, adhesive overflow is likely to occur.

[0059] In one embodiment, such as Figure 4 As shown, the dimension of the patch body 301 along the Z direction is T2, which satisfies 0.05mm≤T2≤0.5mm. By controlling the thickness dimension T2 of the patch body 301 within a suitable range, the strength of the patch body 301 itself can be ensured. If T2 is too small, the strength of the patch body 301 will be insufficient; if T2 is too large, it will waste material and occupy space.

[0060] In one embodiment, such as Figure 4As shown, the dyed adhesive layer 302 has a first surface and a second surface arranged opposite to each other along the Z direction. The first surface is fixedly attached to the patch body 301, and a portion of the second surface is attached to the cover plate 1, while the other portion of the second surface extends directly above the through hole 101. The first surface of the dyed adhesive layer 302 is first completely attached to the patch body 301 to improve the connection strength between the dyed adhesive layer 302 and the patch body 301. A portion of the second surface of the dyed adhesive layer 302 is attached to the cover plate 1, and the other portion is located above the through hole 101 as a compensation area to compensate for the installation error when the dyed adhesive layer 302 is attached to the cover plate 1, and to avoid the width of the part of the dyed adhesive layer 302 attached to the cover plate 1 being too small or the attachment width being uneven.

[0061] In one embodiment, such as Figure 1 As shown, the patch body 301 is provided with at least one vent 303 extending along the Z direction, and the vent 303 communicates with the through hole 101. The vent 303 is used to discharge the gas generated inside the battery cell during daily use, so as to avoid excessive gas inside the battery cell, which would affect the normal use of the explosion-proof valve 2.

[0062] It should be noted that the present invention does not limit the number of exhaust holes 303, and one, two or more can be selected as needed.

[0063] Furthermore, there are no restrictions on the structure of the vent 303; for example, a round hole or a cutout can be selected.

[0064] In one embodiment, the dyed adhesive layer 302 includes a transparent dyed adhesive layer or a non-transparent dyed adhesive layer. Transparent dyed adhesive layers include, but are not limited to, easily identifiable tapes such as blue pressure-sensitive tape and yellow pressure-sensitive tape. Non-transparent dyed adhesive layers include, but are not limited to, easily identifiable tapes such as black polyimide (PI) tape and black fluororubber-coated tape. Setting the dyed adhesive layer 302 to be either transparent or non-transparent facilitates machine detection and identification, ensuring that the protective patch 3 is properly attached to the cover plate 1 and preventing any missed attachment of the protective patch 3.

[0065] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the cover plate 1 is also provided with an electrode post 102 and an injection hole 103. The electrode post 102 is used for electrical connection of the electrode plates inside the cell, and the injection hole 103 is used for injecting electrolyte into the cell.

[0066] Specifically, the electrode 102 includes a positive electrode and a negative electrode, wherein the positive electrode is electrically connected to the positive electrode plate inside the battery cell, and the negative electrode is electrically connected to the negative electrode plate inside the battery cell.

[0067] According to an embodiment of the present invention, another aspect provides a battery cell, mainly 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.

[0068] Therefore, in this embodiment of the present invention, the battery cell protects the explosion-proof valve 2 by covering the through hole 101 with the patch body 301 of the protective patch 3, preventing external dust and electrolyte from contaminating the explosion-proof valve 2. The patch body 301 is transparent, facilitating observation of the explosion-proof valve 2 and detection of the dyed adhesive layer 302. The dyed adhesive layer 302 connects the protective patch 3 and the cover plate 1, and its color is easily detected and identified by the machine, ensuring that the protective patch 3 is properly attached to the cover plate 1 and preventing any omissions. Furthermore, the projection of the dyed adhesive layer 302 onto the XY plane falls within the projection range of the patch body 301 onto the XY plane, further reducing the risk of adhesive overflow.

[0069] According to an embodiment of the present invention, in another aspect, a battery pack is also provided, comprising: at least one battery cell.

[0070] Since the battery pack includes battery cells and has the same effect as the battery cells, it will not be elaborated on here.

[0071] 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.

[0072] 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: The cover plate has a through hole running through it in the Z direction; An explosion-proof valve is disposed within the through hole; A protective patch includes a patch body and a dyed adhesive layer. The dyed adhesive layer is bonded to the lower surface of the patch body along the Z direction. The patch body is transparent. The patch body is fixedly bonded to the upper surface of the cover plate and covers the through hole through the dyed adhesive layer. The projection of the dyed adhesive layer on the XY plane falls within the range of the projection of the patch body on the XY plane.

2. The cell cover assembly according to claim 1, characterized in that, The dyeing adhesive layer is annular and is arranged around the circumference of the through hole. Along the X direction, the size of the part of the dyeing adhesive layer that is bonded to the cover plate is W1, which satisfies W1≥0.5mm. And / or, along the Y direction, the dimension of the part where the dyed adhesive layer is bonded to the cover plate is W2, which satisfies W2≥0.5mm.

3. The cell cover assembly according to claim 2, characterized in that, On the XY plane, the outer contour of the patch body is larger than the outer contour of the dyed adhesive layer, and the distance between the outer contour of the patch body and the outer contour of the dyed adhesive layer is L1, which satisfies 0.05mm≤L1≤0.3mm.

4. The cell cover assembly according to claim 2, characterized in that, The dimension of the dyeing adhesive layer along the Z direction is T1, which satisfies 0.05mm≤T1≤0.2mm.

5. The cell cover assembly according to claim 2, characterized in that, The dimension of the patch body along the Z direction is T2, which satisfies 0.05mm≤T2≤0.5mm.

6. The cell cover assembly according to claim 2, characterized in that, The dyed adhesive layer has a first surface and a second surface that are arranged opposite to each other along the Z direction. The first surface is fixedly attached to the patch body, and a portion of the second surface is attached to the cover plate.

7. The cell cover assembly according to any one of claims 1 to 6, characterized in that, The patch body is provided with at least one vent hole that extends through the Z direction, and the vent hole is connected to the through hole.

8. The cell cover assembly according to any one of claims 1 to 6, characterized in that, The dyeing adhesive layer includes a transparent dyeing adhesive layer or a non-transparent dyeing adhesive layer.

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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