Battery cell cover plate and battery cell

Abstract

The invention 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 first boss and a cover plate main body which are arranged at an interval; the first protection piece is clamped between the first boss and the cover plate body, and part of the first protection piece protrudes out of the outer wall of the first boss. The second protection piece is attached to the surface, facing the connecting piece, of the cover plate body, a protruding second boss is formed on the side, facing the first protection piece, of the second protection piece, and the first boss and the second boss are arranged on the side, away from the battery cell cover plate, of the first protection piece so as to shield the cover plate body located between the second protection piece and the first insulation piece. The first boss and the second boss are arranged on the side, away from the battery cell cover plate, of the first protection part, so that the cover plate body located between the first insulation part and the second protection part is not exposed, effective shielding is formed, and the risk that condensation attached to the first insulation part conducts the cover plate body with a pole or a connecting part is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a cell cover plate and a cell. Background Art

[0002] Traditional cell cover plates include structures such as riveting blocks, upper plastics, pole columns, top cover sheets, lower plastics, sealing rings, etc. The pole columns are fixed on the top cover sheets via the riveting blocks. The upper plastics serve to separate the top cover sheets from the riveting blocks or pole columns. An insulating patch is also provided on the outer side of the cover plate to provide insulation and protection. There is a gap between the upper plastics and the top cover sheets, causing part of the top cover sheets to be exposed. When the cell is in a high-humidity environment, water vapor condenses to form dew, and the dew adhering to the surface of the upper plastics easily flows into the gap between the insulating patch and the upper plastics, thereby conducting the top cover sheet to the pole column or the riveting block, resulting in corrosion and leakage of the cell. Summary of the Invention

[0003] In view of this, the purpose of the present application is to provide a cell cover plate and a cell to solve the problem that the dew on the existing cell cover plate easily conducts the top cover sheet to the pole column or the riveting block, thereby causing corrosion and leakage of the cell.

[0004] The first aspect of the present invention provides a cell cover plate, wherein the cell cover plate includes:

[0005] A cover plate main body, provided with a mounting hole;

[0006] A pole column, passing through the mounting hole;

[0007] A connecting member, connected to the pole column;

[0008] A first insulating member, disposed between the cover plate main body and the connecting member; part of the first insulating member surrounds the circumferential side wall of the connecting member to form a covering portion, and a first convex platform is formed on the outer wall of the covering portion, and the first convex platform is spaced apart from the cover plate main body;

[0009] A first protective member, clamped between the first convex platform and the cover plate main body, and in a first direction, part of the first protective member protrudes from the outer wall of the first convex platform;

[0010] A second protective member, attached to the surface of the cover plate main body facing the connecting member, and in the first direction, a protruding second convex platform is formed on the side of the second protective member facing the first protective member, and the first convex platform and the second convex platform are disposed on the side of the first protective member away from the cell cover plate to shield the cover plate main body located between the second protective member and the first insulating member.

[0011] Preferably, the first protective member is formed as an annular structure sleeved on the outer circumferential wall of the first insulating member.

[0012] Preferably, the distance between the inner wall of the first protective member and the outer wall of the covering portion in the first direction is M, where 0 mm ≤ M ≤ 2 mm.

[0013] Preferably, the distance between the inner wall of the first protective member and the outer wall of the first boss in the first direction is N, where N ≥ 0.3 mm.

[0014] Preferably, in the thickness direction of the cover plate main body, the distance between the first boss and the first protective member is P, where (-0.5×t) mm ≤ P ≤ 2 mm, and t is the thickness dimension of the first protective member in mm.

[0015] Preferably, in the thickness direction of the cover plate main body, the distance between the first protective member and the second boss is E, where 0 mm ≤ E ≤ 2 mm.

[0016] Preferably, in the first direction, the distance between the end of the second boss facing the first boss and the end of the first protective member away from the covering portion is F, where 0.3 mm ≤ F ≤ 10 mm.

[0017] Preferably, a groove for the covering portion to extend into is formed on the side wall of the connecting member facing the cover plate main body.

[0018] Preferably, it further includes:

[0019] A second insulating member provided on the side of the cover plate main body away from the first insulating member;

[0020] A seal sleeved on the pole column, with part of the seal crimped between the cover plate main body and the bottom plate of the pole column, part of the seal crimped between the second insulating member and the bottom plate of the pole column, and part of the seal crimped between the first insulating member and the bottom plate of the pole column.

[0021] The second aspect of the present invention provides an electric core including the electric core cover plate according to any one of the above technical solutions.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] For the cell cover plate of the present invention, a first boss is formed on the outer wall of the covering portion on the first insulating member, and the first boss is disposed at an interval from the cover plate main body; the first protective member is clamped between the first boss and the cover plate main body, and in the first direction, a part of the first protective member protrudes from the outer wall of the first boss; the second protective member is attached to the surface of the cover plate main body facing the connecting member, and in the first direction, the second protective member forms a protruding second boss. The first boss and the second boss are disposed on the side of the first protective member away from the cell cover plate, so that the cover plate main body located between the first insulating member and the second protective member is not exposed, thereby forming an effective shield, effectively reducing the risk that the condensation attached to the first insulating member conducts the cover plate main body to the pole column or the connecting member, and thus reducing the probability of corrosion and liquid leakage of the cell.

[0024] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, details are described as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of the cell cover plate provided by the embodiment of the present invention from the first perspective after removing the second protective member;

[0027] Figure 2 It is a schematic structural diagram of the cell cover plate provided by the embodiment of the present invention from the second perspective after removing the second protective member;

[0028] Figure 3 For the Figure 2 Cross-sectional view taken along line A-A in;

[0029] Figure 4 For Figure 3 Enlarged schematic structural diagram at B in;

[0030] Figure 5 It is a structural cross-sectional view of the second boss formed by a stamping process in the cell cover plate provided by the embodiment of the present invention;

[0031] Figure 6 It is a partial enlarged cross-sectional view of the cell cover plate provided by the embodiment of the present invention.

[0032] Icon: 10 - Cover body; 11 - Mounting hole; 20 - Terminal post; 21 - Base plate; 30 - Connecting piece; 31 - Groove; 40 - First insulating part; 41 - Wrapping part; 411 - First boss; 50 - First protective part; 60 - Second protective part; 61 - Second boss; 70 - Second insulating part; 80 - Sealing part; D1 - First direction. Detailed implementation manners

[0033] The following detailed implementation manners are provided to assist the reader in obtaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications, and equivalents of the methods, apparatuses, and / or systems described herein will be apparent. For example, the order of the operations described herein is merely illustrative and is not limited to the order set forth herein. Rather, changes that will be apparent after understanding the disclosure of the present application may be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0034] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatuses, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0035] Throughout the specification, when an element (such as a layer, region, or substrate) is described as "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "coupled to" another element, "above" another element, or "covering" another element, or there may be one or more other elements therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" another element, "directly coupled to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements therebetween.

[0036] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0037] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or section from another. Thus, a first component, element, region, layer, or section as referred to in the examples described herein may also be termed a second component, element, region, layer, or section without departing from the teachings of the examples.

[0038] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientation of "above" and "below" 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 relationship terms used herein will be interpreted accordingly.

[0039] The terms used herein are for the purpose of describing various examples only and are not intended to limit the disclosure. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0040] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the figures may occur. Thus, the examples described herein are not limited to the specific shapes shown in the figures but include changes in shape that occur during manufacturing.

[0041] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0042] According to a first aspect of the present invention, a battery cell cover plate is provided, which specifically includes a cover plate body 10, a pole 20, a connecting member 30, a first insulating member 40, a first protective member 50, and a second protective member 60.

[0043] In the following, the specific structure of the battery cell cover plate according to the present embodiment will be described as above.

[0044] In the present embodiment, as Figures 1 to 3 and Figure 5 shown, the cover plate main body 10 is formed into a plate-like structure, and a mounting hole 11 is formed on the cover plate main body 10. The mounting hole 11 is formed into a through-hole structure penetrating the cover plate main body 10; when the battery cell is a square shell battery cell or a blade battery cell, the cover plate main body 10 is formed into a rectangular plate-like structure, and when the battery cell is a cylindrical battery cell, the cover plate main body 10 is formed into a circular plate-like structure. The pole column 20 passes through the mounting hole 11 and is used to realize the electrical energy transmission inside and outside the battery cell. One end of the pole column 20 arranged inside the battery cell is formed into a bottom plate 21 for connecting the pole group. Preferably, the bottom plate 21 is formed into a plate-like structure parallel to the cover plate main body 10.

[0045] As Figures 1 to 5 shown, the connecting member 30 is formed into a block-like structure. The connecting member 30 is connected to the pole column 20. Specifically, a connecting hole is formed on the connecting member 30. One end of the pole column 20 arranged outside the battery cell penetrates into the riveting hole and then its circumferential side wall is expanded outward through a stamping process so as to abut against the boss on the inner wall of the riveting hole.

[0046] As Figures 1 to 6 shown, the first insulating member 40 is arranged between the cover plate main body 10 and the connecting member 30 to separate the cover plate main body 10 made of metal material from the connecting member 30, thereby forming an insulating protection for the cover plate main body 10; in the first direction D1, a part of the first insulating member 40 surrounds the circumferential side wall of the connecting member 30 to form a covering portion 41, thereby improving the insulating protection effect of the first insulating member 40. The outer wall of the covering portion 41 is formed with a first boss 411, so that the insulating distance of the first insulating member 40 can be increased. Specifically, the first boss 411 is formed into a closed annular structure; and in the thickness direction of the cover plate main body 10, the first boss 411 is arranged at an interval from the cover plate main body 10.

[0047] As Figures 1 to 6 shown, the first protective member 50 is arranged on the cover plate main body 10, so that the first protective member 50 is clamped between the first boss 411 and the cover plate main body 10. Preferably, the first protective member 50 is formed into an annular structure sleeved on the outer circumferential wall of the first insulating member 40, so that it surrounds the entire circumferential side wall of the covering portion 41, and a part of the first protective member 50 protrudes from the outer wall of the first boss 411, that is, the outer edge of the first protective member 50 protrudes radially from the outer wall of the first boss 411, thereby forming a protection for the cover plate main body 10 located at the periphery of the first insulating member 40. In the present embodiment, the first protective member 50 can be installed on the cover plate main body 10 by means of pasting.

[0048] As Figure 5 and Figure 6As shown, the second protective member 60 is formed into a sheet-like structure having the same shape as the cover plate body 10. For example, when the cover plate body 10 is a rectangular plate-like structure, the second protective member 60 is correspondingly formed into a rectangular sheet-like structure. The second protective member 60 is attached to the surface of the cover plate body 10 facing the connecting member 30. Through holes are formed in the second protective member 60 for the connecting member 30, the pole post 20, the first insulating member 40, and the first protective member 50 to pass through. On the side of the second protective member 60 facing the first protective member 50 in the first direction D1, a second boss 61 extending convexly toward the first boss 411 is formed. The first boss 411 and the second boss 61 are provided on the side of the first protective member 50 away from the cell cover plate to shield the cover plate body 10 located between the second protective member 60 and the first insulating member 40, so that the cover plate body 10 located between the first insulating member 40 and the second protective member 60 is not exposed. The first boss 411 and the second boss 61 respectively cover a part of the first insulating member 40, so that the first boss 411, the second boss 61, and the first protective member 50 jointly achieve effective shielding, effectively reducing the risk that the condensation attached to the first insulating member 40 conducts the cover plate body 10 to the pole post 20 or the connecting member 30, thereby reducing the probability of the cell corroding and leaking liquid.

[0049] In this embodiment, both the first protective member 50 and the second protective member 60 are insulating members to play an insulating and protective role for the cell cover plate.

[0050] In the first implementation manner, as Figure 5 shown, the second boss 61 can be formed on the second protective member 60 through a stamping process, so that the second boss 61 protrudes outward in the thickness direction of the cover plate body 10; in the second implementation manner, as Figure 6 shown, the side of the second protective member 60 facing away from the cover plate body 10 is a flat structure.

[0051] In order to improve the protection effect of the protection structure composed of the first boss 411, the second boss 61, and the first protective member 50 in this application, the following dimensional relationships are defined.

[0052] In this embodiment, as Figure 4 shown, in the first direction D1, the distance between the inner wall of the annular first protective member 50 and the outer wall of the covering portion 41 is M, 0 mm ≤ M ≤ 2 mm, so as to avoid the size of the first boss 411 protruding outward being too large. Preferably, M = 0.5 mm. It should be noted that the first direction D1 is perpendicular to the thickness direction of the cover plate body 10. When the cover plate body 10 is formed into a rectangular plate-like structure, the first direction D1 can be the length direction or the width direction of the cover plate body 10.

[0053] In this embodiment, as Figure 4As shown, the distance between the inner wall of the first protective member 50 and the outer wall of the first boss 411 in the first direction D1 is N, where N≥0.3 mm, so as to ensure that the first boss 411 can effectively block the gap between the first protective member 50 and the first insulating member 40 in the first direction D1, improving the protection effect.

[0054] In this embodiment, as Figure 4 shown, in the thickness direction of the cover plate main body 10, the distance between the first boss 411 and the first protective member 50 is P, (-0.5×t) mm≤P≤2 mm, where t is the thickness dimension of the first protective member 50 in mm. It should be noted that in Figure 4 the perspective shown, when P = 0, the upper surface of the first protective member 50 is coplanar with the lower surface of the first boss 411; when P>0, in the thickness direction of the cover plate main body 10, the upper surface of the first protective member 50 and the lower surface of the first boss 411 are spaced apart; when P<0, at least part of the upper surface of the first protective member 50 extends upward beyond the lower surface of the first boss 411.

[0055] In this embodiment, as Figure 6 shown, in the thickness direction of the cover plate main body 10, the distance between the first protective member 50 and the second boss 61 is E, 0 mm≤E≤2 mm.

[0056] In this embodiment, as Figure 6 shown, in the first direction D1, the distance between the end of the second boss 61 facing the first boss 411 and the end of the first protective member 50 away from the covering portion 41 is F, 0.3 mm≤F≤10 mm, so as to ensure that the second boss 61 effectively blocks the cover plate main body 10 that can be located between the first protective member 50 and the second protective member 60 in the first direction D1, and ensures the insulation effect of the second protective member 60.

[0057] In a preferred embodiment, as Figures 3 to 6 shown, the side wall of the connecting member 30 facing the cover plate main body 10 is recessed inward to form a groove 31 for the covering portion 41 to extend into, so that the covering portion 41 can surround the side wall of the connecting member 30 while avoiding the edge dimension of the first insulating member 40 being too large to meet the design requirements of the blade battery cell with a relatively small thickness dimension.

[0058] In addition, in this embodiment, as Figures 3 to 6As shown, the cell cover plate further includes a second insulating member 70 and a sealing member 80. The second insulating member 70 is disposed on a side of the cover plate body 10 away from the first insulating member 40, thus separating the cover plate body 10 from the pole post 20 and the pole group located inside the cell to form insulation protection. The sealing member 80 is formed as an annular structure and sleeved on the circumferential side wall of a part of the pole post 20. After the connecting member 30 and the pole post 20 are riveted, the connecting member 30 provides a force to press the sealing member 80 and / or the second insulating member 70 onto the bottom plate 21 of the pole post 20 against the first insulating member 40 and / or the cover plate body 10, so as to ensure the sealing performance of the assembled cell cover plate.

[0059] Specifically, in this embodiment, as Figures 3 to 6 shown, a part of the sealing member 80 is pressed between the cover plate body 10 and the bottom plate 21 of the pole post 20, a part of the sealing member 80 is pressed between the second insulating member 70 and the bottom plate 21 of the pole post 20, and a part of the sealing member 80 is pressed between the first insulating member 40 and the bottom plate 21 of the pole post 20, thereby improving the sealing effect.

[0060] According to a cell cover plate provided by the present invention, a first boss is formed on an outer wall of a covering portion on the first insulating member, and the first boss is disposed at an interval from the cover plate body; a first protection member is clamped between the first boss and the cover plate body, and a part of the first protection member protrudes from an outer wall of the first boss; a second protection member is attached to a surface of the cover plate body facing the connecting member, and the second protection member is formed with a protruding second boss. The first boss and the second boss are disposed on a side of the first protection member away from the cell cover plate, so that the cover plate body located between the first insulating member and the second protection member is not exposed, thereby forming an effective shield and effectively reducing the risk that the condensed water adhering to the first insulating member conducts the cover plate body to the pole post or the connecting member, and ensuring the insulation performance of the cell cover plate.

[0061] According to a cell provided by the present invention, it includes the cell cover plate as described above. The cell cover plate has reliable insulation performance, thereby reducing the probability of corrosion and leakage of the cell and ensuring the safety performance of the cell.

[0062] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present application, which are used to illustrate the technical solutions of the present application, rather than limiting them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements 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 the present application, and should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell cover, characterized in that: The battery cover plate comprises: The cover plate body is provided with a mounting hole; A pole, passing through the mounting hole; A connecting piece connected to the pole; A first insulating member is disposed between the cover plate body and the connecting member; a portion of the first insulating member is disposed around the circumferential side wall of the connecting member to form a covering portion, an outer wall of the covering portion is formed with a first boss, and the first boss is spaced apart from the cover plate body; A first protective member, sandwiched between the first boss and the cover plate body, wherein a portion of the first protective member in a first direction protrudes from an outer wall of the first boss; A second protective member is attached to the surface of the cover body facing the connecting member, and a protruding second boss is formed on the side of the second protective member facing the first protective member in the first direction, and the first boss and the second boss are arranged on the side of the first protective member away from the battery cell cover to cover the cover body between the second protective member and the first insulating member.

2. The cell cover plate according to claim 1, characterized in that: The first protective member is formed as an annular structure sleeved on a circumferential outer wall of the first insulating member.

3. The cell cover plate according to claim 2, characterized in that: A distance between an inner wall of the first protective member and an outer wall of the covering portion in a first direction is M, and 0 mm ≤ M ≤ 2 mm.

4. The battery cover according to claim 2, characterized in that: A distance between an inner wall of the first protective member and an outer wall of the first boss in a first direction is N, where N≥0.3 mm.

5. The cell cover plate according to claim 1, characterized in that: In the thickness direction of the cover plate body, the distance between the first boss and the first protective member is P, (-0.5×t) mm≤P≤2 mm, t is the thickness dimension of the first protective member, in mm.

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 first protective member and the second boss is E, 0mm≤E≤2mm.

7. The cell cover plate according to claim 1, characterized in that: In the first direction, a distance F is defined between an end of the second boss facing the first boss and an end of the first protective member away from the covering portion, and 0.3 mm ≤ F ≤ 10 mm.

8. The cell cover plate according to claim 1, characterized in that: The side wall of the connecting member facing the cover plate body forms a groove for the covering portion to extend into.

9. The cell cover plate according to claim 1, characterized in that: Also includes: A second insulating member, disposed on a side of the cover body away from the first insulating member; A seal is sleeved on the pole, part of the seal is crimped between the cover plate body and the bottom plate of the pole, part of the seal is crimped between the second insulating member and the bottom plate of the pole, and part of the seal is crimped between the first insulating member and the bottom plate of the pole.

10. A battery cell, characterized in that: The invention comprises a cell cover plate as described in any one of claims 1 to 9.

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