Cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery cell, and the cover plate assembly comprises a cover plate and a sealing ring; wherein a mounting through hole is formed in the cover plate; the sealing ring comprises a first sealing part and a second sealing part which are connected, the first sealing part is arranged in the mounting through hole, and the first sealing part and the second sealing part are in interference fit; the second sealing part abuts against the inner side surface of the cover plate. Visibly, in the cover plate assembly provided by the invention, the first sealing part of the sealing ring is in interference fit with the mounting through hole in the cover plate, so that the first sealing part cannot move in the mounting through hole of the cover plate, the sealing width of the periphery of the sealing ring is consistent, the sealing effect is improved, the problem of poor local sealing is not likely to occur, liquid leakage is not likely to occur, and the service life of the cover plate assembly is prolonged. And the cover plate is not easy to lose efficacy.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Art

[0002] At present, the cell cover is sealed inside and outside by a sealing ring. Usually, the sealing ring is put on the pole rod and then assembled with other parts such as the top cover, rivet block, lower plastic, etc. Among them, the sealing ring and the pole are interference fitted, and the sealing ring is not easy to loosen when put on the pole. The mounting hole on the top cover is larger than the outer diameter of the upper structure of the sealing ring, so that the pole can be smoothly inserted into the mounting hole of the top cover. Since there is a gap between the upper structure of the sealing ring that matches the mounting hole and the mounting hole, the sealing ring will move in the mounting hole, resulting in uneven distribution of the annular area where the middle sealing structure of the sealing ring abuts against the top cover. In other words, the sealing width around the sealing ring is inconsistent, resulting in poor local sealing, and then causing the cover to fail. Utility Model Content

[0003] The purpose of the present application is to provide a cover plate assembly and a battery cell, which to a certain extent solves the technical problem in the prior art that the upper structure of the sealing ring and the installation through hole on the top cover plate are not matched enough, which leads to inconsistent sealing width around the sealing ring, resulting in local poor sealing and further failure of the cover plate.

[0004] The present application provides a cover plate assembly, comprising: a cover plate and a sealing ring; wherein the cover plate is formed with a mounting through hole; the sealing ring comprises a first sealing portion and a second sealing portion connected to each other, and the first sealing portion is arranged in the mounting through hole, and the two are interference fit; the second sealing portion is arranged against the inner surface of the cover plate.

[0005] In the above technical solution, further, the cover plate assembly also includes a pole, the sealing ring is formed with a first auxiliary through hole, and a partial structure of the pole is inserted into the first auxiliary through hole and is gap-matched with the first auxiliary through hole.

[0006] In any of the above technical solutions, further, the pole includes a connected mounting portion and a column; wherein the column is inserted into the first auxiliary through hole and is gap-matched with the first auxiliary through hole; and the mounting portion is arranged on the inner side of the cover plate.

[0007] In any of the above technical solutions, further, the cover plate assembly further includes a first insulating member, the first insulating member is arranged on the inner side of the cover plate, and a mounting groove and a second auxiliary through hole communicating with the mounting groove are formed on a side of the first insulating member away from the cover plate;

[0008] The installation part is arranged in the installation groove, and the column body passes through the second auxiliary through hole and extends into the first auxiliary through hole of the sealing ring.

[0009] In any of the above technical solutions, further, the sealing ring further includes a third sealing part, the third sealing part is connected to the second sealing part, and the third sealing part is arranged in the second auxiliary through hole of the first insulating member; the third sealing part forms the first auxiliary through hole.

[0010] In any of the above technical solutions, further, the sealing ring is a three-stage stepped structure, and along the inner side of the cover plate towards its outer side, the cross-sectional dimension of the sealing ring gradually decreases.

[0011] In any of the above technical solutions, further, the cover plate assembly further includes a press riveting member and a second insulating member;

[0012] Wherein, the second insulating member and the press riveting member are both sleeved on the column body exposed in the installation through hole of the cover plate, and the press riveting member is riveted to the pole column and presses the second insulating member;

[0013] The first sealing part extends into the third auxiliary through hole of the second insulating member for installing the column body.

[0014] In any of the above technical solutions, further, an annular groove is formed on the outer side of the cover plate and arranged around the outer periphery of the installation through hole, and the annular groove is communicated with the installation through hole; an annular protruding part is formed on the side of the second insulating member close to the cover plate, and the annular protruding part is inserted into the annular groove, and the outer wall of the first sealing part abuts against the inner wall of the annular protruding part.

[0015] In any of the above technical solutions, further, the installation through hole is a circular hole, and the aperture of the installation through hole is a;

[0016] The first sealing part is in a circular ring shape, and the outer diameter of the first sealing part is b, and b - a = 0.05 - 0.2.

[0017] This application also provides an electric core, including a housing, a pole group, and the cover plate assembly according to any of the above technical solutions. Wherein, the pole group is installed in the housing, and the cover plate assembly is installed at the opening end of the housing. Therefore, it has all the beneficial technical effects of this cover plate assembly, and will not be elaborated here.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] In the cover plate assembly provided by the present application, the first sealing portion of the sealing ring is in interference fit with the mounting through hole on the cover plate, so that the first sealing portion will not move within the mounting through hole of the cover plate, thereby making the sealing width around the sealing ring consistent, further improving the sealing effect, not easily having problems of poor local sealing, not easily leaking liquid, and the cover plate not easily failing. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present application 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 application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Structural schematic diagram of the cover plate provided by the embodiment of the present application;

[0022] Figure 2 is Figure 1 Cross-sectional view along the A-A section;

[0023] Figure 3 Structural schematic diagram of the sealing ring provided by the embodiment of the present application;

[0024] Figure 4 is Figure 3 Cross-sectional view along the B-B section;

[0025] Figure 5 Structural schematic diagram of the cover plate assembly provided by the embodiment of the present application;

[0026] Figure 6 is Figure 5 Cross-sectional view along the C-C section;

[0027] Figure 7 is Figure 6 Enlarged structural schematic diagram at D.

[0028] Reference numerals:

[0029] 1 - Cover plate, 11 - Mounting through hole, 12 - Annular groove, 2 - Sealing ring, 21 - First sealing portion, 22 - Second sealing portion, 23 - Third sealing portion, 24 - First auxiliary through hole, 3 - Pole column, 31 - Mounting portion, 32 - Column body, 4 - First insulating member, 5 - Second insulating member, 51 - Annular protruding portion, 6 - Riveting member, 10 - Cover plate assembly. Detailed Embodiments

[0030] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some but not all of the embodiments of the present application.

[0031] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application.

[0032] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0035] Next, refer to Figures 1 to 7 Describe a cover plate assembly and an electric core according to some embodiments of the present application.

[0036] Embodiment 1

[0037] Refer to Figures 1 to 7As shown in the figure, an embodiment of the present application provides a cover plate assembly 10, including: a cover plate 1 and a sealing ring 2; wherein, the cover plate 1 is formed with a mounting through hole 11; the sealing ring 2 includes a connected first sealing portion 21 and a second sealing portion 22, and the first sealing portion 21 is disposed in the mounting through hole 11, and the two are in interference fit; the second sealing portion 22 abuts against the inner surface of the cover plate 1, that is to say, along the direction perpendicular to the inner side of the cover plate 1 towards its outer side, the projection of the first sealing portion 21 completely falls within the second sealing portion 22, and the cross-sectional dimension of the first sealing portion 21 is smaller than that of the second sealing portion 22, so that the second sealing portion 22 can abut against the inner surface of the cover plate 1 to play a role in horizontal sealing and serve as the main sealing area.

[0038] According to the structure described above, the first sealing portion 21 of the sealing ring 2 and the mounting through hole 11 on the cover plate 1 are in interference fit, so that the first sealing portion 21 will not move in the mounting through hole 11 of the cover plate 1, thereby making the sealing width around the sealing ring 2 consistent, improving the sealing effect, not easily having problems of local poor sealing, not easily leaking liquid, and the cover plate 1 not easily failing.

[0039] It should be noted that: the inner side of the cover plate 1 refers to the side of the cover plate 1 close to the electrode group, and the outer side of the cover plate 1 refers to the side of the cover plate 1 away from the electrode group, that is, the side exposed to the housing of the battery cell.

[0040] In this embodiment, preferably, as Figure 4 and Figure 7 shown, the cover plate assembly 10 further includes a terminal post 3, the sealing ring 2 is formed with a first auxiliary through hole 24, and a part of the structure of the terminal post 3 is inserted into the first auxiliary through hole 24 and is in clearance fit with the first auxiliary through hole 24, that is to say, both the first sealing portion 21 and the second sealing portion 22 are formed with the aforementioned first auxiliary through hole 24, and a part of the structure of the terminal post 3 sequentially passes through the first auxiliary through holes 24 on the first sealing portion 21 and the second sealing portion 22.

[0041] According to the structure described above, the terminal post 3 and the cover plate assembly 10 are in clearance fit, that is to say, the diameter dimension of the first auxiliary through hole 24 on the sealing ring 2 is larger than the diameter dimension of the terminal post 3, so the sealing ring 2 can be first assembled with the cover plate 1, and then a part of the structure of the terminal post 3 is inserted into the first auxiliary through hole 24, and the operation is more convenient. It should be noted that: the main part of the sealing ring 2 that plays a sealing role is the horizontal plane part in the step structure, rather than the column part 32, so a clearance is allowed between the column 32 and the first auxiliary through hole 24, which will not affect the sealing.

[0042] In this embodiment, preferably, as Figure 7As shown, the terminal post 3 includes an installation part 31 and a column body 32 which are connected; wherein, the column body 32 is inserted into the first auxiliary through hole 24 and is in clearance fit with the first auxiliary through hole 24; the installation part 31 is arranged on the inner side of the cover plate 1.

[0043] According to the structure described above, the installation part 31 is located on the inner side of the cover plate 1, directly abuts against and is welded to the tab of the electrode group after being flattened, reducing the intermediate structural parts, reducing the internal resistance, and having a relatively large contact area, improving the welding stability and current-carrying capacity; the terminal post 3 sequentially passes through the cover plate 1 and the first insulating member 4 described below and extends to the outside of the cover plate 1 as the main output end.

[0044] In this embodiment, preferably, as Figure 7 shown, the cover plate assembly 10 further includes a first insulating member 4. The first insulating member 4 is arranged on the inner side of the cover plate 1, and an installation groove and a second auxiliary through hole communicating with the installation groove are formed on the side of the first insulating member 4 facing away from the cover plate 1;

[0045] The installation part 31 is arranged in the installation groove, and the column body 32 passes through the second auxiliary through hole and extends into the first auxiliary through hole 24 of the sealing ring 2.

[0046] According to the structure described above, the first insulating member 4 wraps the side and side wall of the installation part 31 close to the cover plate 1, achieving a good insulating effect.

[0047] In this embodiment, preferably, as Figure 4 and Figure 7 shown, the sealing ring 2 further includes a third sealing part 23. The third sealing part 23 is connected to the second sealing part 22, and the third sealing part 23 is arranged in the second auxiliary through hole of the first insulating member 4; the third sealing part 23 forms the aforementioned first auxiliary through hole 24.

[0048] According to the structure described above, the third sealing part 23 seals the space between the terminal post 3 and the first insulating member 4, improving the sealing effect, avoiding the problem of liquid leakage, and making the battery cell safer and more reliable.

[0049] Furthermore, preferably, the second auxiliary through hole is a circular hole, and the third sealing part 23 is also an annular structure. Of course, it is not limited to this. The second auxiliary installation through hole 11 can also be a square hole, the third sealing part 23 can be a square ring, or a structure with a circular inner ring and a square outer ring, etc., which is specifically selected according to actual needs.

[0050] It should be noted that: it is not limited to the above structure including the third sealing portion 23. That is to say, the sealing ring 2 may also only include the first sealing portion 21 and the second sealing portion 22, that is, the sealing ring 2 has a two-stage stepped structure. At this time, the second sealing portion 22 is arranged in the second auxiliary through hole of the first insulating member 4, and the second sealing portion 22 not only abuts against the inner surface of the cover plate 1, but also abuts against the mounting portion 31, and the sealing effect cannot be achieved either.

[0051] In this embodiment, preferably, as Figure 4 and Figure 7 shown, the sealing ring 2 has a three-stage stepped structure, and along the inner side of the cover plate 1 towards its outer side, the cross-sectional dimension of the sealing ring 2 gradually decreases.

[0052] According to the structure described above, the sealing ring 2 is divided into three parts, which can meet the assembly and sealing requirements at different positions and avoid liquid leakage.

[0053] Furthermore, preferably, the sealing ring 2 is a three-stage stepped columnar structure with a mounting through hole 11 formed inside. Its shape is regular, meeting the assembly requirements, improving the assembly accuracy, thus contributing to enhancing the sealing effect and being convenient for molding. Of course, it is not limited to this, and the shape of the sealing ring 2 can also be designed according to actual needs.

[0054] In addition, it should be noted that: the sealing ring 2 can also be the aforementioned two-stage stepped structure, specifically selected according to needs.

[0055] In this embodiment, preferably, as Figure 4 and Figure 7 shown, the first sealing portion 21, the second sealing portion 22 and the third sealing portion 23 are of an integral structure.

[0056] According to the structure described above, the sealing ring 2 adopts an integral structure, with high overall strength, not easily damaged, good sealing effect and high production efficiency. Of course, it is not limited to this, and it can also be designed according to actual needs.

[0057] In this embodiment, preferably, as Figure 7 shown, the cover plate assembly 10 further includes a riveting member 6 and a second insulating member 5;

[0058] Wherein, both the second insulating member 5 and the riveting member 6 are sleeved on the column 32 exposed in the mounting through hole 11 of the cover plate 1, and the riveting member 6 is riveted to the pole column 3 and presses the second insulating member 5 tightly;

[0059] The first sealing portion 21 extends into the third auxiliary through hole of the second insulating member 5 for installing the column 32.

[0060] According to the structure described above, the riveting component 6 functions to fix the pole column 3 and the second insulating component 5, and the second insulating component 5 functions to isolate the riveting component 6 from the cover plate 1, that is, it functions as insulation protection.

[0061] Furthermore, preferably, the materials of the first insulating component 4 and the second insulating component 5 can both be plastic. Of course, it is not limited to this, and other materials can also be selected according to actual needs.

[0062] In this embodiment, preferably, as Figure 7 shown, an annular groove 12 is formed on the outer side of the cover plate 1 and is arranged around the outer periphery of the mounting through-hole 11, and the annular groove 12 communicates with the mounting through-hole 11;

[0063] An annular protrusion 51 is formed on the side of the second insulating component 5 close to the cover plate 1, and the annular protrusion 51 is inserted into the annular groove 12, and the outer wall of the first sealing portion 21 abuts against the inner wall of the annular protrusion 51.

[0064] According to the structure described above, the annular protrusion 51 is inserted into the annular groove 12, which functions to position the second insulating component 5 and improve the assembly efficiency and accuracy.

[0065] In this embodiment, preferably, as Figure 2 and Figure 4 shown, the mounting through-hole 11 is a circular hole, and the diameter of the mounting through-hole 11 is a;

[0066] The first sealing portion 21 is in a circular ring shape, and the outer diameter of the first sealing portion 21 is b, and b - a = 0.05 - 0.2.

[0067] According to the structure described above, controlling the interference fit amount between the first sealing portion 21 and the mounting through-hole 11 on the cover plate 1 between 0.05 and 0.2 can not only effectively prevent the first sealing portion 21 from moving in the mounting through-hole 11 of the cover plate 1, but also ensure that the first sealing portion 21 can be smoothly installed into the mounting through-hole 11, avoiding problems such as difficult installation due to excessive interference amount or deformation of the cover plate 1 during the installation process.

[0068] Embodiment Two

[0069] Embodiment Two of the present application further provides a battery cell, including the cover plate assembly 10 described in Embodiment One above. Therefore, it has all the beneficial technical effects of the cover plate assembly 10, and the same technical features and beneficial effects will not be repeated here.

[0070] In this embodiment, preferably, the battery cell further includes a housing and a pole group; wherein, the pole group is installed in the housing, and the cover plate assembly 10 is installed at the opening end of the housing.

[0071] According to the structure described above, in the battery cell provided by the present application, the first sealing portion 21 of the sealing ring 2 is in interference fit with the mounting through hole 11 on the cover plate 1, so that the first sealing portion 21 will not move within the mounting through hole 11 of the cover plate 1. Furthermore, the sealing width around the sealing ring 2 is made consistent, thereby improving the sealing effect, making it not easy to have problems of poor local sealing and liquid leakage, and making the battery cell not easy to fail, making the battery cell safer and more reliable.

[0072] Furthermore, preferably, the housing can be open at one end or both ends along a preset direction. When the housing is open at one end, the aforementioned cover plate assembly 10 can be installed at this open end. When the housing is open at both ends, the aforementioned cover plate assembly 10 can be installed at one opening, and the structure of the ordinary cover plate 1 in the prior art can be provided at the other opening, or the aforementioned cover plate assembly 10 can be installed at both openings, which is specifically selected according to actual needs.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; 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: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that, include: A cover plate and a sealing ring; wherein the cover plate is formed with a mounting through hole; the sealing ring comprises a first sealing portion and a second sealing portion connected to each other, and the first sealing portion is arranged in the mounting through hole, and the two are interference fit; the second sealing portion is arranged against the inner surface of the cover plate.

2. The cover plate assembly according to claim 1, wherein The cover plate assembly further includes a pole, the sealing ring is formed with a first auxiliary through hole, and a partial structure of the pole is inserted into the first auxiliary through hole and is gap-matched with the first auxiliary through hole.

3. The cover plate assembly according to claim 2, wherein, The pole comprises a mounting portion and a column connected to each other; wherein the column is inserted into the first auxiliary through hole and is gap-matched with the first auxiliary through hole; and the mounting portion is arranged on the inner side of the cover plate.

4. The cover plate assembly according to claim 3, wherein The cover plate assembly further includes a first insulating member, which is disposed on the inner side of the cover plate, and a mounting groove and a second auxiliary through hole communicating with the mounting groove are formed on a side of the first insulating member away from the cover plate; The mounting portion is disposed in the mounting groove, and the column passes through the second auxiliary through hole and extends into the first auxiliary through hole of the sealing ring.

5. The cover plate assembly according to claim 4, wherein The sealing ring further includes a third sealing portion, the third sealing portion is connected to the second sealing portion, and the third sealing portion is disposed in the second auxiliary through hole of the first insulating component; the first auxiliary through hole is formed in the third sealing portion.

6. The cover plate assembly according to claim 5, characterized in that, The sealing ring is a three-step structure, and the cross-sectional size of the sealing ring gradually decreases along the inner side of the cover plate toward the outer side thereof.

7. The cover plate assembly according to claim 3, wherein, The cover plate assembly further includes a riveting component and a second insulating component; Wherein, the second insulating component and the riveting component are both sleeved on the column exposed on the mounting through hole of the cover plate, and the riveting component is riveted to the pole and presses the second insulating component; The first sealing portion extends into a third auxiliary through hole of the second insulating member for mounting the column.

8. The cover plate assembly according to claim 7, characterized in that, An annular groove is formed on the outer side of the cover plate and is arranged around the outer periphery of the mounting through hole, and the annular groove is communicated with the mounting through hole; an annular protrusion is formed on the side of the second insulating member close to the cover plate, and the annular protrusion is inserted into the annular groove, and the outer wall of the first sealing part abuts against the inner wall of the annular protrusion.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that The mounting through hole is a circular hole, and the aperture of the mounting through hole is a; The first sealing portion is in an annular shape, and the outer diameter of the first sealing portion is b, and ba=0.05-0.

2.

10. A battery cell, characterized in that, It comprises a shell, a pole group and a cover plate assembly as claimed in any one of claims 1 to 9; wherein the pole group is installed in the shell, and the cover plate assembly is installed at the open end of the shell.

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