Battery cell cover plate and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate main body which is provided with a pressure relief opening and a liquid injection opening, and a convex part for separating the pressure relief opening and the liquid injection opening is arranged on one side, facing the outside of the battery cell, of the cover plate main body; a notch communicated with the pressure relief opening is formed in the convex part; the protection part is attached to the side, facing the exterior of the battery cell, of the cover plate body, at least part of the protection part covers the pressure relief opening and part of the notch, so that the part, not shielded by the protection part, of the notch forms a detection part, and the detection part is arranged on the side, away from the liquid injection opening, of the pressure relief opening. The convex part can effectively prevent electrolyte from entering the pressure relief piece, the electrolyte is prevented from being in contact with the protection piece, the situation that the viscosity of the protection piece is reduced due to electrolyte pollution, and the protection piece falls off is prevented, the detection part is arranged on the side, away from the liquid injection opening, of the pressure relief opening, and therefore the liquid injection opening and the detection part are effectively separated, and the detection accuracy is improved. And the reliability and effectiveness of avoiding the contact between the electrolyte and the protection piece are ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a cell cover plate and a cell. Background Technology

[0002] Lithium-ion batteries are widely used in transportation power supplies, power storage, new energy storage power supplies, aerospace and military industries due to their advantages such as large capacity, high operating voltage, strong charge retention capability and long cycle life.

[0003] The structure of a lithium-ion battery includes a cover plate, a casing, and electrode arrays. The cover plate and casing are connected by laser welding to form a sealed space that protects the electrode arrays and has a certain strength. The cover plate integrates components such as electrode terminals, electrolyte injection holes, and explosion-proof valves. The explosion-proof valve plays a crucial role in preventing thermal runaway and thermal propagation in individual cells and even the entire battery pack. Currently, explosion-proof valves are typically protected by explosion-proof valve films, which are designed with helium detection notches to detect abnormalities such as valve damage or cracking during the cover plate manufacturing process or cell manufacturing process. However, during the electrolyte injection and pre-charging processes in cell manufacturing, a small amount of electrolyte often leaks from the injection port, posing a risk of contaminating the explosion-proof valve film. This reduces the adhesive strength of the explosion-proof valve film's adhesive layer, leading to film detachment and affecting cell production efficiency. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a cell cover plate and a cell to solve the problem that the explosion-proof valve film on the existing cell cover plate is easily contaminated by electrolyte, which leads to a decrease in the adhesive strength of the adhesive layer and the easy occurrence of the explosion-proof valve film falling off, thus affecting the cell production efficiency.

[0005] The first aspect of this utility model provides a battery cell cover plate, wherein the battery cell cover plate comprises:

[0006] The cover plate body has a pressure relief port and a liquid injection port. The side of the cover plate body facing the outside of the battery cell has an outward protrusion to separate the pressure relief port and the liquid injection port. The protrusion has a recessed notch that communicates with the pressure relief port.

[0007] A protective component is attached to the side of the cover plate body facing the outside of the battery cell. At least part of the protective component covers the pressure relief port and part of the notch, such that the part of the notch not covered by the protective component forms a detection part. The detection part is located on the side of the pressure relief port away from the liquid injection port.

[0008] Preferably, the protrusion is formed as an annular structure surrounding the pressure relief port, and the protective member is attached to the protrusion.

[0009] Preferably, the notch connects the pressure relief port and the protrusion on the side away from the cover plate body.

[0010] Preferably, a portion of the protrusion is not obstructed by the protective member.

[0011] Preferably, it further includes:

[0012] A pressure relief component is installed at the pressure relief port to seal the pressure relief port.

[0013] Preferably, the pressure relief component has a recessed groove. When the internal pressure of the battery cell reaches a preset value, the pressure relief component tears along the shape of the groove, causing part of the pressure relief component to be lifted up.

[0014] Preferably, the notched portion is formed as a ring structure with an opening.

[0015] Preferably, the grooved portion is located on the side of the pressure relief component facing the protective component.

[0016] Preferably, it further includes:

[0017] Riveted parts, with rivet holes;

[0018] The pole is inserted through the rivet hole and riveted to the rivet.

[0019] The height of the protrusion protruding from the cover plate body is less than or equal to the distance between the end of the riveting member facing the outside of the battery cell and the cover plate body.

[0020] The second aspect of this utility model provides a battery cell, including the battery cell cover plate described in any of the above technical solutions.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This utility model discloses a battery cell cover plate. The cover plate body has a pressure relief port and a liquid injection port. A protrusion separating the pressure relief port and the liquid injection port is formed on the side of the cover plate body facing the outside of the battery cell. A recessed notch communicating with the pressure relief port is formed on the protrusion. A protective component is attached to the side of the cover plate body facing the outside of the battery cell, with at least a portion of the protective component covering the pressure relief port and part of the notch. The portion of the notch not covered by the protective component forms a detection section. This arrangement avoids penetrating the protective component, ensuring its integrity. Even if electrolyte remains on the surface of the cover plate body during the battery cell manufacturing process, the protrusion effectively prevents electrolyte from entering the pressure relief component and avoids contact between the electrolyte and the protective component. This prevents the protective component from detaching due to reduced viscosity caused by electrolyte contamination, thereby improving the battery cell manufacturing yield and production efficiency. The detection section is located on the side of the pressure relief port away from the liquid injection port, effectively separating the liquid injection port and the detection section, ensuring the reliability and effectiveness of preventing electrolyte contact with the protective component.

[0023] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of the structure of the battery cell cover plate provided in an embodiment of the present utility model;

[0026] Figure 2 A schematic diagram of the battery cell cover plate provided in an embodiment of this utility model from another perspective;

[0027] Figure 3 This is a schematic diagram of the structure of the protective component in the battery cell cover provided in an embodiment of the present utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the battery cell cover after the protective component has been removed, according to an embodiment of the present utility model.

[0029] Figure 5 This is a schematic diagram of the battery cell cover plate after the protective component has been removed, as provided in an embodiment of the present invention, from another perspective.

[0030] Icons: 10-Pressure relief component; 11-Scratched section; 111-Connecting section; 100-Protective component; 20-Cover plate body; 201-Pressure relief port; 202-Injection port; 21-Protrusion; 210-Notch; 211-Detection section; 30-Pole post; 40-Rivet component. Detailed Implementation

[0031] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0032] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0033] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0034] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0035] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0036] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0037] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0038] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0039] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0040] According to a first aspect of the present invention, a battery cell cover is provided, which specifically includes a cover body 20 and a protective component 100.

[0041] The specific structure of the cell cover plate according to this embodiment, as described above, will be described below.

[0042] In this embodiment, as Figure 4 and Figure 5 As shown, the cover plate body 20 is formed into a plate-shaped structure. For example, when the battery cell is a square-shell battery cell or a blade battery cell, the cover plate body 20 is a rectangular plate-shaped structure. For example, when the battery cell is a cylindrical battery cell, the cover plate body 20 is a circular plate-shaped structure. The cover plate body 20 is provided with a pressure relief port 201 and a liquid injection port 202. Both the pressure relief port 201 and the liquid injection port 202 are formed into through holes that penetrate the cover plate body 20, so that the inside and outside of the battery cell are connected. When the battery cell fails and needs to be vented, the gas inside the battery cell is discharged to the outside of the battery cell through the pressure relief port 201. After the battery cell shell and the cover plate are assembled, electrolyte is injected into the battery cell through the liquid injection port 202 and a vacuum is drawn.

[0043] In this embodiment, as Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the cover plate body 20 has an outwardly protruding protrusion 21 on the side facing the outside of the battery cell to separate the pressure relief port 201 and the electrolyte injection port 202, thereby blocking the electrolyte to a certain extent and preventing residual electrolyte on the cover plate body 20 from entering the pressure relief port 201 during the battery cell manufacturing process. The protrusion 21 can be integrally formed with the cover plate body 20, or it can be connected by welding or bonding.

[0044] In this embodiment, as Figure 4 and Figure 5 As shown, a recessed notch 210 is formed on the protrusion 21 and communicates with the pressure relief port 201. The notch 210 can be a groove structure or a channel structure that connects the pressure relief port 201 and the outside of the cell.

[0045] In this embodiment, as Figures 1 to 3 As shown, the protective component 100 can be an explosion-proof valve liner. The protective component 100 is attached to the side of the cover plate body 20 facing the outside of the battery cell. At least part of the protective component 100 covers the pressure relief port 201 and part of the notch 210, so that the part of the notch 210 not covered by the protective component 100 forms the detection part 211. This arrangement does not require breaking through the protective component 100, ensuring the integrity of the protective component 100. Even if electrolyte remains on the surface of the cover plate body 20 during the battery cell manufacturing process, the protrusion 21 can effectively prevent the electrolyte from entering the pressure relief component 10 and avoid contact between the electrolyte and the protective component 100, preventing the protective component 100 from falling off due to the decrease in viscosity caused by electrolyte contamination.

[0046] In this embodiment, as Figure 1 and Figure 2 As shown, the detection unit 211 is located on the side of the pressure relief port 201 away from the liquid injection port 202, thus effectively separating the liquid injection port 202 and the detection unit 211, ensuring the reliability and effectiveness of preventing the electrolyte from contacting the protective component 100. The detection unit 211 is connected to the pressure relief port 201, and during the manufacturing of the battery cell, the battery cell can be helium tested via the detection unit 211 to avoid abnormalities such as damage or leakage of the pressure relief component 10 as described below.

[0047] In a preferred embodiment, such as Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the protrusion 21 is formed as an annular structure surrounding the pressure relief port 201 to provide full protection for the pressure relief port 201, preventing residual electrolyte on the cover plate body 20 from entering the pressure relief port 201. The protective member 100 is attached to the protrusion 21. Specifically, the protective member 100 is attached to the side of the protrusion 21 facing away from the cover plate body 20, and part of the protrusion 21 extends outward from the circumferential edge of the protective member 100, so that the outer edge of the protrusion 21 away from the cover plate body 20 is not blocked by the protective member 100, thus ensuring that part of the notch 210 is not blocked by the protective member 100, thereby ensuring that a detection part 211 that meets the helium detection requirements is formed on the notch 210. It should be noted that in this embodiment, the side of the protective member 100 facing the protrusion 21 has an adhesive layer, so the protective member 100 can be directly attached to the surface of the protrusion 21.

[0048] Furthermore, in this embodiment, as Figure 4 and Figure 5 As shown, the protrusion 21 of the annular structure has an inner wall on one side of the ring and an outer wall on one side of the ring. The notch 210 connects the pressure relief port 201 and the side of the protrusion 21 away from the cover plate body 20, so that the notch 210 extends from the inner wall of the annular structure to the side of the protrusion 21 away from the cover plate body 20. In this way, the notch 210 does not penetrate the outer wall of the annular structure, thereby ensuring that the protrusion 21 can effectively separate the injection port 202 and the pressure relief port 201.

[0049] In this embodiment, as Figure 4 and Figure 5 As shown, the cell cover also includes a pressure relief component 10, which can be an explosion-proof valve. The pressure relief component 10 is installed on the pressure relief port 201 to seal the pressure relief port 201, thereby ensuring that the inside of the cell is a closed space. The pressure relief component 10 can be welded to the pressure relief port 201.

[0050] Furthermore, in this embodiment, as Figure 4 and Figure 5 As shown, a recessed groove 11 is formed on the pressure relief component 10. The groove 11 can be a strip-shaped groove structure. When the battery cell fails and produces gas, when the preset pressure is reached inside the battery cell, the pressure relief component 10 tears along the shape of the groove 11, so that part of the pressure relief component 10 is lifted up, that is, part of the pressure relief component 10 is folded towards the outside of the battery cell to connect the inside and outside of the battery cell, thereby realizing the exhaust and pressure relief.

[0051] Furthermore, in this embodiment, as Figure 4 and Figure 5 As shown, the grooved portion 11 is formed into a ring structure with a slot, and the slotted position on the grooved portion 11 is formed into a connecting segment 111. In this way, when the pressure relief component 10 is opened and part of the pressure relief component 10 is lifted, the connecting segment 111 keeps the lifted part of the pressure relief component 10 connected to the unlifted part, thereby avoiding the risk of short circuit caused by the metal piece (i.e. the lifted part of the pressure relief component 10) falling off after the pressure relief component 10 is opened.

[0052] In a preferred embodiment, such as Figure 4 and Figure 5 As shown, the grooved part 11 is provided on the side of the pressure relief part 10 facing the protective part 100, so that the pressure relief part 10 can be pushed open when the gas inside the cell reaches the opening pressure.

[0053] Furthermore, in this embodiment, such as Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the cell cover also includes a riveting member 40 and a terminal post 30. The riveting member 40 has a riveting hole and is formed as a block structure. The riveting hole is formed as a stepped hole structure that penetrates through the riveting member 40. The terminal post 30 passes through the riveting hole and is riveted to the riveting member 40 to fix the terminal post 30 to the cover body 20. The connection method between the terminal post 30 and the riveting member 40 can be riveting first and then welding. The height of the protrusion 21 protruding from the cover body 20 is less than or equal to the distance between the end of the riveting member 40 facing the outside of the cell and the cover body 20. In this way, the protrusion 21 can effectively separate the pressure relief member 10 and the liquid injection port 202 and keep the protective member 100 away from the liquid injection port 202. At the same time, it can also avoid the problem that the protrusion height of the protrusion 21 is too large, which would occupy the design size of the cell and affect the energy density of the cell.

[0054] According to the present invention, a battery cell cover plate has a pressure relief port and a liquid injection port on its main body. A protrusion is formed on the side of the main body facing the outside of the battery cell to separate the pressure relief port and the liquid injection port. A notch is formed on the protrusion and communicates with the pressure relief port. A protective member is attached to the side of the main body facing the outside of the battery cell. At least part of the protective member covers the pressure relief port and part of the notch, so that the part of the notch not covered by the protective member forms a detection part. This arrangement does not require breaking through the protective member, ensuring the integrity of the protective member. Even if electrolyte remains on the surface of the main body of the cover plate during the battery cell manufacturing process, the protrusion can effectively prevent the electrolyte from entering the pressure relief member and avoid contact between the electrolyte and the protective member. This prevents the protective member from falling off due to reduced viscosity caused by electrolyte contamination. The detection part is located on the side of the pressure relief port away from the liquid injection port, thus effectively separating the liquid injection port and the detection part, ensuring the reliability and effectiveness of preventing contact between the electrolyte and the protective member.

[0055] According to the present invention, a battery cell includes a battery cell cover plate as described above. The protrusions on the battery cell cover plate can effectively prevent the electrolyte from contacting the protective component, thereby improving the process yield and production efficiency of the battery cell.

[0056] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery cell cover plate, characterized in that, The cell cover plate includes: The cover plate body has a pressure relief port and a liquid injection port. The side of the cover plate body facing the outside of the battery cell has an outward protrusion to separate the pressure relief port and the liquid injection port. The protrusion has a recessed notch that communicates with the pressure relief port. A protective component is attached to the side of the cover plate body facing the outside of the battery cell. At least part of the protective component covers the pressure relief port and part of the notch, such that the part of the notch not covered by the protective component forms a detection part. The detection part is located on the side of the pressure relief port away from the liquid injection port.

2. The cell cover plate according to claim 1, characterized in that, The protrusion is formed as an annular structure surrounding the pressure relief port, and the protective component is attached to the protrusion.

3. The cell cover plate according to claim 2, characterized in that, The notch connects the pressure relief port and the protrusion on the side away from the cover plate body.

4. The cell cover plate according to claim 2, characterized in that, The outer edge of the protrusion on the side away from the cover plate body is not obstructed by the protective component.

5. The cell cover plate according to claim 1, characterized in that, Also includes: A pressure relief component is installed at the pressure relief port to seal the pressure relief port.

6. The cell cover plate according to claim 5, characterized in that, The pressure relief component has a recessed groove. When the internal pressure of the battery cell reaches a preset value, the pressure relief component tears along the shape of the groove, causing part of the pressure relief component to be lifted up.

7. The cell cover plate according to claim 6, characterized in that, The grooved portion is formed as a ring structure with an opening.

8. The cell cover plate according to claim 6, characterized in that, The grooved portion is located on the side of the pressure relief component facing the protective component.

9. The cell cover plate according to claim 1, characterized in that, Also includes: The riveted component has riveting holes; The pole is inserted through the rivet hole and riveted to the rivet. The height of the protrusion protruding from the cover plate body is less than or equal to the distance between the end of the riveting member facing the outside of the battery cell and the cover plate body.

10. A battery cell, characterized in that, Includes the cell cover plate as described in any one of claims 1 to 9.

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