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 provided with a mounting hole; the pole is arranged in the mounting hole; the connecting piece is connected with the pole; the first insulating piece is clamped between the connecting piece and the cover plate main body, and part of the first insulating piece coats the circumferential side wall of the connecting piece to form a coating part; and at least one inclined surface is formed at the end part of the coating part in the first direction, so that the water drops are guided towards the direction far away from the pole. According to the utility model, the inclined surface is arranged to guide the water drops falling on the coating part towards the direction far away from the pole, so that the connection between the pole and the cover plate main body caused by the accumulation of the water drops on the first insulating part is avoided, the insulating property of the first insulating part is ensured, and the safety performance of the battery cell is further improved.

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] A battery generally consists of an internal structure and an external structure. The internal structure mainly includes the battery terminals, while the external structure mainly includes the battery cover, battery casing, and battery insulation components. Multiple batteries, including the casing and cover, are connected in series and / or parallel to form a battery module, which is then installed in a battery pack. In high-temperature, high-humidity, and salt-spray environments, condensation easily forms inside the battery pack. Since the battery terminals are usually exposed, condensation dripping onto the external insulation structure can easily form water droplets, causing water accumulation on the top of the insulation. This can easily connect the top cover plate on the battery cover to the terminals, leading to insulation failure and causing safety issues. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a cell cover plate and a cell to solve the problem that condensation water dripping onto the insulation structure in the cell cover plate easily forms water droplets, which will connect the top cover plate to the terminal post and cause insulation failure.

[0004] The first aspect of this utility model provides a battery cell cover plate, wherein the battery cell cover plate comprises:

[0005] The cover plate body has mounting holes;

[0006] The pole post is disposed in the mounting hole;

[0007] Connector, which connects to the pole post;

[0008] A first insulating element is sandwiched between the connector and the cover plate body, and a portion of the first insulating element covers the circumferential sidewall of the connector to form a covered portion; the covered portion has at least one inclined surface formed at its end in a first direction.

[0009] Preferably, the inclined surface is perpendicular to the plane of the cover plate body.

[0010] Preferably, the covering portion has two inclined surfaces at each end in the first direction, and the two inclined surfaces have opposite inclination directions.

[0011] Preferably, the covering portion is formed into a triangular or trapezoidal block structure at both ends in the first direction.

[0012] Preferably, the cover plate body is a rectangular plate structure, and the first direction is the length direction of the cover plate body.

[0013] Preferably, in the thickness direction of the cover plate body, the distance between the end of the electrode facing the outside of the cell and the cover plate body is less than the distance between the end of the connector facing the outside of the cell and the cover plate body.

[0014] Preferably, in the thickness direction of the cover plate body, the distance between the end of the covering portion facing the outside of the battery cell and the cover plate body is less than the distance between the end of the connector facing the outside of the battery cell and the cover plate body.

[0015] Preferably, it also includes:

[0016] The second insulating element is disposed inside the battery cell and is sandwiched between the cover plate body and the bottom plate of the electrode post.

[0017] Preferably, it also includes:

[0018] A sealing element is fitted onto the circumferential sidewall of the pole post, and a portion of the sealing element is sandwiched between the cover plate body and the bottom plate of the pole post.

[0019] 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.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] The battery cell cover of this utility model has a first insulating member sandwiched between a connector and the cover body. A portion of the first insulating member protrudes towards the connector to form a covering portion that covers the circumferential sidewall of the connector. The end of the covering portion in the first direction has at least one inclined surface, which guides water droplets falling on the covering portion away from the electrode post, preventing water droplets from accumulating on the first insulating member and causing connection between the electrode post and the cover body, thereby ensuring the insulation performance of the first insulating member and improving the safety performance of the battery cell.

[0022] 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

[0023] 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.

[0024] Figure 1This is a schematic diagram of the structure of the battery cell cover plate provided in an embodiment of the present utility model;

[0025] Figure 2 A schematic diagram of the battery cell cover plate provided in an embodiment of this utility model from another perspective;

[0026] Figure 3 For along Figure 2 Cross-sectional view taken at point AA in the middle;

[0027] Figure 4 A schematic diagram of the battery cell provided in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the exploded structure of the battery cell provided in an embodiment of the present invention.

[0029] Icons: 100-Cover plate body; 101-Mounting hole; 102-Vent hole; 200-Pole post; 201-Base plate; 300-Connector; 400-First insulating component; 401-Covering part; 402-Bevel; 500-Second insulating component; 600-Sealing component; 700-Pressure relief assembly; 10-Cell cover plate; 20-Cell housing; 30-Pole group; 40-Insulating layer; 50-Insulating film; 60-Insulating patch; D1-First direction. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] According to a first aspect of the present invention, a battery cell cover plate is provided, which specifically includes a cover plate body 100, an electrode post 200, a connector 300, and a first insulating member 400.

[0040] The specific structure of the cell cover plate according to this embodiment, as described above, will be described below.

[0041] In this embodiment, as Figures 1 to 3 As shown, the cover plate body 100 is formed into a plate-like structure. When the battery cell is a blade battery cell or a prismatic battery cell, the cover plate body 100 is formed into a rectangular plate-like structure; when the battery cell is a cylindrical battery cell, the cover plate body 100 is formed into a circular plate-like structure. The cover plate body 100 has mounting holes 101 and vent holes 102, both of which are through-hole structures penetrating the cover plate body 100. The electrode post 200 is disposed in the mounting hole 101 to determine the mounting position of the electrode post 200 on the cover plate body 100. The connector 300 is formed as a block structure and is located on the side of the cover plate body 100 facing the outside of the battery cell. The connector 300 has a connection hole. After the electrode post 200 passes through the connection hole, its circumferential sidewall at the end facing the outside of the battery cell expands outward through processes such as stamping, thereby connecting the electrode post 200 to the connector 300 and fixing the electrode post 200 to the cover plate body 100. After connection, the electrode post 200 can be welded to the connector 300, or it can be directly welded after passing through the connection hole. The cover plate body 100, the electrode post 200, and the connector 300 are all metal parts.

[0042] In this embodiment, as Figures 1 to 3As shown, the first insulating member 400 is sandwiched between the connector 300 and the cover plate body 100 to separate the connector 300 and the cover plate body 100, reducing the risk of short circuit. In this embodiment, a portion of the first insulating member 400 covers the circumferential sidewall of the connector 300 to form a covering portion 401; the end of the covering portion 401 in the first direction D1 has at least one inclined surface 402 to guide water droplets away from the pole post 200, so that water droplets dripping onto the top of the first insulating member 400 can roll off the inclined surface 402 under the action of gravity, avoiding the accumulation of water droplets on the first insulating member 400 and causing the connection between the pole post 200 and the cover plate body 100, thereby ensuring the insulation performance of the first insulating member 400.

[0043] It should be noted that the first direction D1 is the height direction of the battery cell, that is, the vertical direction when the battery cell is assembled in the battery pack. In a preferred embodiment, the cover plate body 100 is a rectangular plate structure, and the first direction D1 is the length direction of the cover plate body 100.

[0044] In this embodiment, as Figure 1 and Figure 2 As shown, the inclined surface 402 is perpendicular to the plane of the cover body 100, so that the inclination direction of the inclined surface 402 is set at an angle to the side wall of the covering part 401 in the width direction of the cover body 100, which effectively prevents water droplets from contacting the pole 200 or the connector 300 when rolling down along the inclined surface 402, thereby improving the insulation reliability of the first insulating member 400.

[0045] In a preferred embodiment, such as Figure 1 and Figure 2 As shown, the covering portion 401 has two inclined surfaces 402 at each end in the first direction D1, so that it is not necessary to deliberately distinguish the front and back of the battery cell, which facilitates the assembly of the battery cells. Specifically, the two inclined surfaces 402 are inclined in opposite directions, which increases the slope of the inclined surfaces 402, allowing water droplets to roll off quickly.

[0046] Furthermore, in this embodiment, as Figure 1 and Figure 2 As shown, the covering portion 401 is formed into triangular or trapezoidal block structures at both ends in the first direction D1, making the covering portion 401 an axisymmetric structure. This improves the aesthetics of the cell cover and facilitates the rapid rolling off of water droplets from both sides, effectively preventing water droplets from contacting the terminal post 200 or the connector 300. It should be noted that when the covering portion 401 is formed into trapezoidal block structures at both ends in the height direction of the cell, the length of the top edge of the trapezoid is relatively small. This facilitates the processing and shaping of the first insulating component 400 and ensures that water droplets do not accumulate at the top edge of the trapezoid.

[0047] In this embodiment, as Figure 3As shown, in the thickness direction of the cover plate body 100, the distance between the end of the pole post 200 facing the outside of the cell and the cover plate body 100 is less than the distance between the end of the connector 300 facing the outside of the cell and the cover plate body 100. This satisfies the welding requirements of the pole post 200 and the connector 300 and ensures the flatness of the connector 300.

[0048] In this embodiment, as Figure 3 As shown, in the thickness direction of the cover plate body 100, the distance between the end of the covering part 401 facing the outside of the battery cell and the cover plate body 100 is less than the distance between the end of the connector 300 facing the outside of the battery cell and the cover plate body 100. This facilitates the connection between the battery cell and the busbar, ensuring that the battery cell can effectively transmit electrical energy.

[0049] Furthermore, in this embodiment, such as Figure 3 As shown, the cell cover also includes a second insulating element 500 and a sealing element 600. Both the first insulating element 400 and the second insulating element 500 are made of insulating material. The second insulating element 500 is disposed inside the cell. The end of the pole post 200 facing the inside of the cell has a base plate 201 for connecting the tabs on the pole group. The second insulating element 500 is sandwiched between the cover body 100 and the base plate 201 of the pole post 200, thus separating the cover body 100 and the pole post 200, thereby providing insulation protection for the cover body 100.

[0050] In this embodiment, as Figure 3 As shown, the sealing element 600 is formed as an annular structure sleeved on the circumferential sidewall of the pole post 200. The sealing element 600 is disposed on the inner wall of the mounting hole 101 and part of the circumferential sidewall of the pole post 200. Part of the sealing element 600 is sandwiched between the cover plate body 100 and the bottom plate 201 of the pole post 200. After the pole post 200 is connected to the connecting block, it can apply a certain compressive force to the sealing element 600, causing the sealing element 600 to deform, thereby ensuring the sealing performance of the cell cover plate and preventing electrolyte leakage inside the cell. The sealing element 600 can be an elastic sealing ring.

[0051] Furthermore, in this embodiment, such as Figures 1 to 3 As shown, the cell cover also includes a pressure relief assembly 700 installed in the vent hole 102. The pressure relief assembly 700 includes an explosion-proof valve and an explosion-proof valve patch. The explosion-proof valve is embedded in the vent hole 102, and the explosion-proof valve patch is located on the surface of the cover body 100 facing the outside of the cell and in the closed portion of the vent hole 102, so as to protect the explosion-proof valve from being lifted and opened by external impact.

[0052] According to the present invention, a battery cell cover plate is provided, wherein a first insulating member is sandwiched between a connector and a cover plate body, and a portion of the first insulating member protrudes toward the direction close to the connector to form a covering portion covering the circumferential sidewall of the connector; in the height direction of the battery cell, at least one inclined surface is formed at the end of the covering portion, thereby guiding water droplets falling on the covering portion toward the direction away from the electrode post, preventing water droplets from accumulating on the first insulating member and causing connection between the electrode post and the cover plate body, thereby ensuring the insulation performance of the first insulating member.

[0053] According to the present invention, a battery cell includes a battery cell cover plate 10 as described above, a battery cell housing 20, an electrode group 30, an insulating layer 40, an insulating film 50, and an insulating patch 60.

[0054] In this embodiment, as Figure 4 and Figure 5 As shown, the electrode assembly 30 is installed inside the cell housing 20 and is wrapped with an insulating layer 40 to separate the electrode assembly 30 from the cell housing 20, thus forming an insulating protection. The insulating layer 40 can be a Mylar film. The cell housing 20 and the cell cover plate 10 are welded together to form a closed space to accommodate the electrode assembly 30. The outer wall of the cell housing 20 is wrapped with an insulating film 50 to prevent the metal cell housing 20 from short-circuiting with the outside. An insulating patch 60 is installed on the outward-facing surface of the cell cover plate 10, thereby providing insulation. The insulating film 50 and the insulating patch 60 also have a certain protective function to prevent wear and scratches on the cell housing 20 and the cell cover plate 10. Specifically, the insulating patch 60 has an opening with the same shape as the covering part, and the opening is clearance-fitted with the first insulating element to ensure that the first insulating element, the connector, and the electrode post can extend smoothly.

[0055] According to the present invention, a battery cell is provided in which water droplets will not accumulate on the battery cell cover, reducing the risk of short circuit and thus improving the safety performance 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 mounting holes; The pole post is disposed in the mounting hole; Connector, which connects to the pole post; A first insulating element is sandwiched between the connector and the cover plate body, and a portion of the first insulating element covers the circumferential sidewall of the connector to form a covered portion; the covered portion has at least one inclined surface formed at its end in a first direction.

2. The cell cover plate according to claim 1, characterized in that, The inclined surface is perpendicular to the plane of the cover plate body.

3. The cell cover plate according to claim 1, characterized in that, The covering portion has two inclined surfaces at each end in the first direction, and the two inclined surfaces are inclined in opposite directions.

4. The cell cover plate according to claim 1 or 3, characterized in that, The covering portion is formed into a triangular or trapezoidal block structure at both ends in the first direction.

5. The cell cover plate according to claim 1, characterized in that, The cover plate body is a rectangular plate structure, and the first direction is the length direction of the cover plate body.

6. The cell cover plate according to claim 1, characterized in that, In the thickness direction of the cover plate body, the distance between the end of the electrode facing the outside of the cell and the cover plate body is less than the distance between the end of the connector facing the outside of the cell and the cover plate body.

7. The cell cover plate according to claim 1, characterized in that, In the thickness direction of the cover plate body, the distance between the end of the covering portion facing the outside of the battery cell and the cover plate body is less than the distance between the end of the connector facing the outside of the battery cell and the cover plate body.

8. The cell cover plate according to claim 1, characterized in that, Also includes: The second insulating element is disposed inside the battery cell and is sandwiched between the cover plate body and the bottom plate of the electrode post.

9. The cell cover plate according to claim 1, characterized in that, Also includes: A sealing element is fitted onto the circumferential sidewall of the pole post, and a portion of the sealing element is sandwiched between the cover plate body and the bottom plate of the pole post.

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

Images