Battery cell cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate assembly and a battery cell, and the battery cell cover plate assembly comprises a cover plate, an anti-explosion valve, a sealing component and a pressing component; wherein a through hole is formed in the cover plate, the anti-explosion valve is installed in the through hole, and a sealing component is arranged between the anti-explosion valve and the hole wall of the through hole; the pressing component is arranged on one side of the anti-explosion valve in a pressing mode and connected with the cover plate, and an exhaust through hole corresponding to the anti-explosion valve is formed in the pressing component. According to the battery cell cover plate assembly provided by the invention, the mounting mode of the explosion-proof valve in the prior art is changed, the sealing component is arranged on the periphery of the explosion-proof valve, so that the explosion-proof valve and the through hole of the cover plate are mounted more tightly, the explosion-proof valve is pressed by the pressing component, and the effect of fixing the explosion-proof valve is achieved; therefore, a mounting structure in which the explosion-proof valve is directly welded on a smooth aluminum plate is replaced, the influence of welding heat on the explosion-proof valve is avoided, and the bad problems of deformation, failure and the like of the explosion-proof valve can be effectively prevented.

Description

Technical Field

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

[0002] Currently, a battery cell is equipped with an explosion-proof valve for exhausting gas during thermal runaway, thereby further suppressing thermal runaway to ensure the safety and reliability during the use of the battery cell. Currently, the explosion-proof valve is fixed on a light aluminum plate by welding, and the structure is relatively firm. However, the welding fixing method also has certain problems. During welding, heat will affect the explosion-proof valve, easily causing problems such as deformation and failure of the explosion-proof valve. Summary of the Utility Model

[0003] The purpose of the present application is to provide a battery cell cover assembly and a battery cell, which to a certain extent solve the technical problems existing in the prior art that the explosion-proof valve is fixed on a light aluminum plate by welding, the structure is relatively firm, and heat during welding will affect the explosion-proof valve, easily causing problems such as deformation and failure of the explosion-proof valve.

[0004] The present application provides a battery cell cover assembly, including: a cover plate, an explosion-proof valve, a sealing member, and a pressing member; wherein, a through hole is formed in the cover plate, the explosion-proof valve is installed in the through hole, and the sealing member is arranged between the explosion-proof valve and the hole wall of the through hole; the pressing member presses on one side of the explosion-proof valve and is connected to the cover plate, and the pressing member is formed with an exhaust through hole corresponding to the explosion-proof valve.

[0005] In the above technical solution, further, along the direction from the first side of the cover plate towards its second side, the through hole includes a first hole portion, a second hole portion, and a third hole portion that are sequentially connected and communicated to form a three-stage stepped hole with gradually increasing aperture, and the explosion-proof valve is installed in the second hole portion, and the pressing member is installed in the third hole portion.

[0006] In any of the above technical solutions, further, the sealing member is formed on the outer periphery of the explosion-proof valve by encapsulation.

[0007] In any of the above technical solutions, further, the pressing member is connected to the cover plate by welding.

[0008] In any of the above technical solutions, further, the pressing member is of an annular structure.

[0009] In any of the above technical solutions, further, the battery cell cover assembly further includes a terminal post, a fixing member, a first insulating member, a second insulating member, and a sealing ring;

[0010] Wherein, the cover plate is formed with a mounting through hole, the pole column is mounted in the mounting through hole, and one end of the pole column extends to the second side of the cover plate via the mounting through hole, and a second insulating member is disposed between the pole column and the cover plate. The sealing ring is sequentially compressed in the mounting through hole by the pole column structure and the second insulating member located on the second side of the cover plate, and is located between the pole column and the cover plate;

[0011] The other end of the pole column extends to the first side of the cover plate via the mounting through hole, is inserted into the fixing member, and is threadedly connected to the fixing member; the first insulating member is disposed between the fixing member and the cover plate.

[0012] In any of the above technical solutions, further, the pole column includes a connected column body and a pressing portion; wherein, the pressing portion is disposed on the second side of the cover plate, the column body is disposed in the mounting through hole, and one end of the pole column extends to the first side of the cover plate via the mounting through hole, is inserted into the fixing member, and is threadedly connected to the fixing member.

[0013] In any of the above technical solutions, further, along the direction from the first side of the cover plate towards its second side, an insulating patch or an insulating coating is disposed in the area on the surface of the first side of the cover plate that is not covered by the projection of the first insulating member.

[0014] In any of the above technical solutions, further, the first side of the cover plate is formed with a stamping flange disposed around the outer periphery of the mounting through hole, and the first insulating member is injection-molded to wrap around the outside of the stamping flange.

[0015] In any of the above technical solutions, further, the second insulating member has a groove structure, and the inner side wall of the groove is in clearance fit with the side wall of the pole column.

[0016] In any of the above technical solutions, further, the first insulating member has a groove structure, and the fixing member is mounted in the groove.

[0017] The present application also provides an electric core, including a housing, a pole group, and the electric core cover plate assembly according to any of the above technical solutions. Wherein, the pole group is disposed in the housing, and the electric core cover plate assembly seals the opening of the housing. Therefore, all the beneficial technical effects of the electric core cover plate assembly are achieved, and details are not described herein again.

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

[0019] In the cell cover assembly provided in this application, the installation method of the explosion-proof valve in the prior art is changed. A sealing member is provided on the outer periphery of the explosion-proof valve to make its installation in the through hole of the cover plate closer. And a pressing member is used to press the explosion-proof valve to play a role in fixing the explosion-proof valve, thereby replacing the installation structure of directly welding the explosion-proof valve on the light aluminum plate. Furthermore, the influence of welding heat on the explosion-proof valve is avoided, and thus the occurrence of adverse problems such as deformation and failure of the explosion-proof valve can be effectively prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of this 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 It is an exploded view of the cell cover assembly provided in an embodiment of this application;

[0022] Figure 2 It is another exploded view of the cell cover assembly provided in an embodiment of this application;

[0023] Figure 3 It is an assembly drawing of the cell cover assembly provided in an embodiment of this application;

[0024] Figure 4 It is Figure 3 A cross-sectional view along the A-A section;

[0025] Figure 5 It is Figure 4 An enlarged structural schematic diagram at B;

[0026] Figure 6 It is Figure 4 An enlarged structural schematic diagram at C;

[0027] Figure 7 It is a structural schematic diagram of the terminal provided in this embodiment;

[0028] Figure 8 It is an assembly drawing of the fixing member and the first insulating member provided in this embodiment;

[0029] Figure 9 It is an assembly drawing of the explosion-proof valve and the sealing member provided in this embodiment;

[0030] Figure 10 It is a structural schematic diagram of the pressing member provided in this embodiment.

[0031] Reference numerals:

[0032] 1 - Cover plate, 11 - Through hole, 111 - First hole part, 112 - Second hole part, 113 - Third hole part, 14 - Mounting through hole, 15 - Stamped flanging, 2 - Explosion - proof valve, 3 - Sealing member, 4 - Pressing member, 5 - Terminal post, 51 - Column body, 52 - Pressing part, 6 - Fixing member, 61 - Threaded hole, 7 - First insulating part, 8 - Second insulating part, 9 - Sealing ring, 10 - Insulating patch. Detailed implementation mode

[0033] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0034] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various 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 present application claimed, but merely represents the selected embodiments of the present application.

[0035] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0036] 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 thus 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 understood as indicating or implying relative importance.

[0037] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "install", "connect", "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can 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.

[0038] Next, refer to Figures 1 to 10 Describe the cell cover plate assembly and the cell according to some embodiments of the present application.

[0039] Embodiment 1

[0040] SeeFigures 1 to 10 As shown in the figure, an embodiment of the present application provides a cell cover plate assembly, including: a cover plate 1, an explosion-proof valve 2, a sealing member 3, and a pressing member 4; wherein, the cover plate 1 is formed with a through hole 11, the explosion-proof valve 2 is installed in the through hole 11, and a sealing member 3 is arranged between the explosion-proof valve 2 and the hole wall of the through hole 11; the pressing member 4 presses on one side of the explosion-proof valve 2 and is connected to the cover plate 1, and the pressing member 4 is formed with an exhaust through hole 11 corresponding to the explosion-proof valve 2.

[0041] According to the structure described above, in the cell cover plate assembly provided in the present application, the installation method of the explosion-proof valve 2 in the prior art is changed. A sealing member 3 is arranged on the outer periphery of the explosion-proof valve 2 to make its installation with the through hole 11 of the cover plate 1 closer. And the pressing member 4 presses on the explosion-proof valve 2 to play a role in fixing the explosion-proof valve 2, thereby replacing the installation structure of directly welding the explosion-proof valve on the light aluminum plate, and further avoiding the influence of welding heat on the explosion-proof valve, and further effectively preventing the occurrence of adverse problems such as deformation and failure of the explosion-proof valve.

[0042] Further, preferably, the pressing member 4 presses on the side of the explosion-proof valve 2 close to the outside of the cell.

[0043] In this embodiment, preferably, as Figure 6 shown, along the direction from the first side of the cover plate 1 to its second side, the through hole 11 includes a first hole portion 111, a second hole portion 112, and a third hole portion 113 that are sequentially connected and communicated to form a three-stage stepped hole with gradually increasing aperture, and the explosion-proof valve 2 is installed in the second hole portion 112, and the pressing member 4 is installed in the third hole portion 113.

[0044] According to the structure described above, a bottom wall is formed between the first hole portion 111 and the second hole portion 112, which plays a role in supporting the explosion-proof valve 2, making the assembly of the explosion-proof valve 2 and the cover plate 1 more stable; a bottom wall is formed between the second hole portion 112 and the third hole portion 113, which plays a role in supporting the pressing member 4, making the assembly of the pressing member 4 and the cover plate 1 more stable.

[0045] It should be noted that: the through hole 11 is not limited to the structure of the three-stage stepped hole described above, and it can also be a two-stage stepped hole. That is to say, along the direction from the first side of the cover plate 1 to its second side, the through hole 11 includes a first hole portion 111 and a second hole portion 112 that are sequentially connected and communicated to form a two-stage stepped hole with gradually increasing aperture, and the explosion-proof valve 2 is installed in the second hole portion 112, and the pressing member 4 is installed on the outer surface of the cover plate 1, which is specifically designed according to actual needs.

[0046] In addition, it should be noted that: the first side of the cover plate 1 is preferably the inner side of the cover plate 1, that is, the side close to the electrode group, and the second side of the cover plate 1 is preferably the outer side of the cover plate 1, that is, the side far from the electrode group, that is to say, the side exposed to the housing of the battery cell.

[0047] In this embodiment, preferably, as Figure 6 and Figure 9 shown, the sealing member 3 is formed on the outer periphery of the explosion-proof valve 2 by means of encapsulation.

[0048] According to the structure described above, a sealing member 3 is formed in a circle on the outer periphery of the explosion-proof valve 2 by means of encapsulation. The process is mature, simple and easy to implement, and the sealing area is comprehensively covered, which helps to improve the sealing effect.

[0049] In this embodiment, preferably, the pressing member 4 is connected to the cover plate 1 by welding.

[0050] According to the structure described above, the pressing member 4 is fixed on the cover plate 1 by welding, and the structure is more stable and firm. Moreover, the sealing member also has the function of heat insulation. Therefore, the heat generated when the pressing member 4 is welded to the cover plate 1 will not affect the explosion-proof valve 2 inside, further avoiding damage to the explosion-proof valve 2.

[0051] It should be noted that: the fixing method of the pressing member 4 and the cover plate 1 is not limited to the above, and can also be by means of glue bonding, etc.

[0052] In this embodiment, preferably, as Figure 10 shown, the pressing member 4 is of an annular structure.

[0053] According to the structure described above, the annular pressing member 4 can not only press and fix the circumference of the explosion-proof valve 2, but also the hollow part of the pressing member 4 can ensure normal exhaust during thermal runaway.

[0054] In this embodiment, preferably, as Figures 1 to 8 shown, the battery cell cover plate assembly further includes a terminal 5, a fixing member 6, a first insulating member 7, a second insulating member 8 and a sealing ring 9;

[0055] Among them, the cover plate 1 is formed with an installation through hole 14, the terminal 5 is installed in the installation through hole 14, and one end of the terminal 5 extends to the outside of the cover plate 1 through the installation through hole 14, and a second insulating member 8 is provided between the terminal 5 and the cover plate 1. The sealing ring 9 is sequentially compressed in the installation through hole 14 by the terminal 5 structure located outside the cover plate 1 and the second insulating member 8, and is located between the terminal 5 and the cover plate 1;

[0056] The other end of the terminal post 5 extends to the first side of the cover plate 1 through the mounting through hole 14, is inserted into the fixing member 6, and is threadedly connected to the fixing member 6; the first insulating member 7 is disposed between the fixing member 6 and the cover plate 1.

[0057] According to the structure described above, the sealing ring 9 is disposed between the cover plate 1 and the second insulating member 8, the assembly is simpler, the internal space of the battery cell can be saved, the height space can be saved by about 3-4 mm, the space utilization rate is improved, the battery cell capacity is increased, at the same time, the length of the tab is shortened, and the internal resistance of the battery cell is reduced.

[0058] Moreover, by adjusting the matching height between the terminal post 5 and the fixing member 6, the pressing degree of the second insulating member 8 on the sealing ring 9 can be adjusted, and then the compression amount of the sealing ring 9 can be adjusted to meet different sealing requirements. Moreover, it has the property of being repeatedly disassembled, is more convenient for adjustment, and has stronger practicability. Moreover, the tab of the electrode group can be directly welded to the surface of the fixing member 6 close to the electrode group, saving the structure of the connecting piece, increasing the welding area, and improving the current-carrying capacity.

[0059] Further, preferably, one end of the terminal post 5 located on the first side of the cover plate 1 is inserted into the threaded through hole 11 of the fixing member 6 and is threadedly connected to the threaded through hole 11 to ensure that the two have sufficient contact area, improving the stability and reliability of the connection.

[0060] In this embodiment, preferably, as Figure 5 and Figure 7 shown, the terminal post 5 includes a connected column body 51 and a pressing portion 52; wherein, the pressing portion 52 is disposed outside the cover plate 1, the column body 51 is disposed in the mounting through hole 14, one end of the terminal post 5 extends to the first side of the cover plate 1 through the mounting through hole 14, is inserted into the fixing member 6, and is threadedly connected to the fixing member 6.

[0061] According to the structure described above, the pressing portion 52 functions to press the second insulating member 8 and the sealing member 3, and the column body 51 functions to connect the fixing member 6.

[0062] Further, preferably, as Figure 7 shown, the fixing member 6 is provided with a threaded hole 61, and the outer portion of the column body 51 is provided with an external thread adapted to the threaded hole 61.

[0063] Further, preferably, the column body 51 is a cylinder, the fixing member 6 is a ring-shaped structure with an internal thread provided on the inner wall, and the pressing portion 52 is a disc-shaped structure. Of course, it is not limited thereto.

[0064] Further, preferably, the column body 51 and the pressing portion 52 can be an integral structure, which has higher strength. Of course, it is not limited thereto, and it can also be a split structure and be connected by welding or the like.

[0065] In this embodiment, preferably, as Figure 1 and Figure 2 shown, along the direction from the first side of the cover plate 1 towards its second side, an insulating coating or an insulating patch 10 is provided in the area on the surface of the first side of the cover plate 1 that is not covered by the projection of the first insulating member 7.

[0066] According to the structure described above, all the lower plastic structures except the position of the pole column 5 are cancelled, and an insulating coating with a thin-wall structure (wherein, there are many material selections, spraying UV, electrostatic metal powder) or an insulating patch 10, etc. are provided on the first side of the cover plate 1. The structure is simple, the forming process is mature, and the cost is low, and the ultimate space improvement and cost reduction can be achieved.

[0067] In this embodiment, preferably, as Figure 2 and Figure 5 shown, a stamping flange 15 is formed on the first side of the cover plate 1 and is arranged around the outer periphery of the mounting through hole 14, and the first insulating member 7 is injection-molded and wrapped around the outside of the stamping flange 15.

[0068] According to the structure described above, a stamping flange structure is provided on the cover plate 1, which increases the strength of the integral injection molding combination of the first insulating member 7 and the cover plate 1, has better dimensional accuracy, and improves the safety performance of the cover plate 1 assembly.

[0069] Furthermore, preferably, the fixing member 6, the first insulating member 7 and the cover plate 1 are integrally injection-molded and connected, which is safe and reliable. Of course, it is not limited to this.

[0070] In this embodiment, preferably, the second insulating member 8 has a groove structure, and the inner side wall of the groove is in clearance fit with the side wall of the pole column 5.

[0071] According to the structure described above, the side wall of the pole column 5 is in clearance fit with the inner side wall of the groove of the second insulating member 8. Furthermore, by screwing the pole column 5, the matching height of the pole column 5 and the fixing member 6 along the thickness direction of the cover plate 1 can be adjusted, so as to adjust the pressing degree on the sealing ring 9, and the compression amount of the sealing ring 9 can reach 25% - 50%, and at the same time, it has repeatable disassembly.

[0072] In this embodiment, preferably, as Figure 8 shown, the first insulating member 7 has a groove structure, and the fixing member 6 is installed in the groove. The first insulating member 7 can wrap the surface of the fixing member 6 close to the cover plate 1 and the outer side wall of the fixing member 6, and the covering area is large, and the insulating effect is good.

[0073] Embodiment Two

[0074] Embodiment 2 of the present application further provides an electric core, including the electric core cover plate assembly described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of this electric core cover plate assembly, and the same technical features and beneficial effects will not be repeated.

[0075] In this embodiment, preferably, the electric core further includes a housing and an electrode assembly; wherein, the electrode assembly is disposed inside the housing, and the electric core cover plate assembly seals the opening of the housing.

[0076] It should be noted that: the housing may be formed with an open end, and the aforementioned electric core cover plate assembly may be installed at this open end. The housing may also be formed with two open ends, and at least one of the two open ends is installed with the aforementioned electric core cover plate assembly, which is specifically designed according to actual needs.

[0077] 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 it; 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 described 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 cell cover plate assembly, characterized in that, Comprising: A cover plate, an explosion-proof valve, a sealing member, and a pressing member; wherein, a through hole is formed in the cover plate, the explosion-proof valve is installed in the through hole, and the sealing member is arranged between the explosion-proof valve and the hole wall of the through hole; the pressing member presses on one side of the explosion-proof valve and is connected to the cover plate, and the pressing member is formed with an exhaust through hole corresponding to the explosion-proof valve.

2. The cell cover plate assembly according to claim 1, characterized in that Along the direction from the first side of the cover plate towards its second side, the through hole includes a first hole portion, a second hole portion, and a third hole portion that are sequentially connected to form a three-stage stepped hole with gradually increasing aperture, and the explosion-proof valve is installed in the second hole portion, and the pressing member is installed in the third hole portion.

3. The cell cover plate assembly according to claim 1, wherein, The sealing member is formed on the outer periphery of the explosion-proof valve by means of encapsulation.

4. The cell cover plate assembly according to claim 1, characterized in that, The pressing member and the cover plate are connected by means of welding.

5. The cell cover plate assembly according to claim 1, characterized in that, The pressing member is of an annular structure.

6. The cell cover plate assembly according to claim 1, characterized in that The battery cell cover plate assembly further includes a pole column, a fixing member, a first insulating member, a second insulating member, and a sealing ring; wherein, an installation through hole is formed in the cover plate, the pole column is installed in the installation through hole, and one end of the pole column extends to the second side of the cover plate through the installation through hole, and the second insulating member is arranged between the pole column and the cover plate. The sealing ring is sequentially compressed in the installation through hole by the pole column structure on the second side of the cover plate and the second insulating member, and is located between the pole column and the cover plate; The other end of the pole column extends to the first side of the cover plate through the installation through hole, and is inserted into the fixing member and is threadedly connected to the fixing member; the first insulating member is arranged between the fixing member and the cover plate.

7. The cell cover plate assembly according to claim 6, characterized in that, The pole column includes a column body and a pressing portion that are connected; wherein, the pressing portion is arranged on the second side of the cover plate, the column body is arranged in the installation through hole, and one end of the pole column extends to the first side of the cover plate through the installation through hole, and is inserted into the fixing member and is threadedly connected to the fixing member.

8. The cell cover plate assembly according to claim 6, wherein, Along the direction from the first side of the cover plate towards its second side, an insulating patch or an insulating coating is provided in the area on the surface of the first side of the cover plate that is not covered by the projection of the first insulating member.

9. The cell cover plate assembly according to any one of claims 6 to 8, characterized in that, The first side of the cover plate is formed with a stamping flange arranged around the outer periphery of the installation through hole, and the first insulating member is wrapped outside the stamping flange by injection molding; and / or The second insulating member has a groove structure, and the inner side wall of the groove is in clearance fit with the side wall of the pole column; and / or The first insulating member has a groove structure, and the fixing member is installed in the groove.

10. A battery cell, characterized in that, Comprising a housing, a pole group, and the battery cell cover plate assembly according to any one of claims 1 to 9; wherein, the pole group is arranged in the housing, and the battery cell cover plate assembly seals the opening of the housing.

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