Battery cell top cover assembly and battery module

Abstract

The utility model discloses a battery cell top cover component and battery module, including top cover and upper insulator, wherein the top cover is equipped with mounting through hole and annular groove, mounting through hole is used for the pole to pass through, annular groove is arranged on the top surface of top cover and is constructed to surround the periphery of mounting through hole; the upper insulating part is provided with a sealing through hole and a fitting end face, the sealing through hole is used for being in sealing fit with the pole, the fitting end face is arranged on the side, facing the top cover, of the upper insulating part and is used for being bonded to the top face of the top cover through structural adhesive, an annular convex part is arranged on the fitting end face, and the annular convex part is constructed to be bonded to the annular groove in a matched mode. According to the battery cell top cover assembly, the waterproof sealing performance between the upper insulating part and the top cover can be greatly improved, and the problem that the battery cell top cover assembly is prone to battery cell sealing failure is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core sealing, and more specifically to a battery core top cover assembly and a battery module. Background Art

[0002] In the energy storage and battery module application market, the sealing design of the overall structure of the battery cell is an important design link in the overall structure design of the battery cell, and its specific implementation method usually adopts the battery cell top cover assembly. The battery cell top cover assembly generally includes an upper insulating member, a top cover (such as a bare aluminum sheet), a pole and a lower insulating member, among which, the top cover is provided with a mounting hole for the pole to pass through, and the upper insulating member is mainly arranged on the top cover by hot pressing, which is used to achieve insulation, sealing and waterproofing between the pole and the mounting hole of the top cover and the structural connection between the two. However, this connection method between the upper insulating member and the top cover is prone to unqualified hot pressing and material aging, which in turn easily causes the problem of water ingress due to failure of the battery cell seal, and ultimately causes the battery cell to swell and even explode.

[0003] In summary, how to solve the problem that the battery cell top cover assembly is prone to battery cell sealing failure has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0004] In view of this, the utility model provides a battery cell top cover assembly and a battery module to solve the problem that the battery cell top cover assembly is prone to battery cell sealing failure.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A battery cell top cover assembly, comprising:

[0007] A top cover having a mounting hole and an annular groove, wherein the mounting hole is used for the pole to pass through, and the annular groove is arranged on the top surface of the top cover and is configured to surround the periphery of the mounting hole;

[0008] The upper insulating member has a sealing through hole and a fitting end face, wherein the sealing through hole is used to be sealed and adapted with the pole, the fitting end face is arranged on the side of the upper insulating member facing the top cover and is used to be bonded to the top surface of the top cover by means of structural adhesive, an annular protrusion is arranged on the fitting end face, and the annular protrusion is constructed to be adapted and bonded with the annular groove.

[0009] Optionally, the annular groove is configured as a circular annular groove, and the number of rings of the circular annular groove is at least one.

[0010] Optionally, the annular groove has multiple rings, and the annular protrusion is adapted to at least one of the annular grooves.

[0011] Optionally, the annular grooves are arranged concentrically, and the groove spacing between two adjacent annular grooves is equal.

[0012] Optionally, the matching structure between the annular protrusion and the annular groove is configured so that the protruding height of the annular protrusion does not exceed the groove depth of the annular groove.

[0013] Optionally, when the annular protrusion is adapted and bonded to the annular groove, a first preset gap for accommodating the structural adhesive is provided between the raised top surface of the annular protrusion and the groove bottom surface of the annular groove.

[0014] Optionally, the matching structure between the annular protrusion and the annular groove is configured such that the protrusion width of the annular protrusion is smaller than the groove width of the annular groove.

[0015] Optionally, when the annular protrusion is adapted and bonded to the annular groove, a second preset gap is provided between the inner annular wall of the annular protrusion and the inner annular wall of the annular groove for accommodating the structural adhesive; and / or a third preset gap is provided between the outer annular wall of the annular protrusion and the outer annular wall of the annular groove for accommodating the structural adhesive.

[0016] Optionally, the upper insulating member is provided with an annular embedding portion corresponding to the bottom of the sealing through hole, which is fitted and embedded with the inner hole wall of the mounting through hole.

[0017] Optionally, a conductive sheet is connected to the bottom of the pole, an insulating sealing ring is provided between the conductive sheet and the bottom surface of the top cover, and a portion of the insulating sealing ring is in contact with the bottom surface of the annular embedded portion.

[0018] Optionally, it further includes a lower insulating member arranged on the bottom surface of the top cover, the lower insulating member is provided with an avoidance opening for avoiding the installation via hole and the insulating sealing ring, and the outer edge of the avoidance opening is provided with a limiting structure for limiting the conductive sheet.

[0019] Optionally, a radial convex portion arranged along the circumferential direction is provided in the middle of the inner hole wall of the sealed through hole, and the pole is riveted to the radial convex portion;

[0020] And / or, the top cover is configured as a plain aluminum plate;

[0021] And / or, the upper insulating member is configured as an insulating plastic member;

[0022] And / or, it also includes a lower insulating part arranged on the bottom surface of the top cover, and the lower insulating part is configured as an insulating plastic part, and / or, a first positioning structure is arranged on the bottom surface of the top cover corresponding to the position of the mounting hole, and the lower insulating part is arranged with a second positioning structure adapted to the first positioning structure.

[0023] Compared with the background technology introduction, the above-mentioned battery cell top cover assembly includes a top cover and an upper insulating member, wherein the top cover has a mounting through hole and an annular groove, the mounting through hole is used for the pole to pass through, the annular groove is arranged on the top surface of the top cover, and is constructed to surround the periphery of the mounting through hole; the upper insulating member has a sealing through hole and a fitting end face, the sealing through hole is used to seal and fit with the pole, the fitting end face is arranged on the side of the upper insulating member facing the top cover and is used to be bonded to the top surface of the top cover by structural adhesive, an annular protrusion is arranged on the fitting end face, and the annular protrusion is constructed to fit and bond with the annular groove. In actual application of the battery cell top cover assembly, since the upper insulating member has a fitting end face, and the fitting end face is bonded to the top surface of the top cover by structural adhesive, a first waterproof seal can be formed between the upper insulating member and the top cover; in addition, since an annular protrusion is provided on the fitting end face, through the adaptive bonding of the annular protrusion and the annular groove, water needs to cross a trench structure formed by the concave-convex matching between the two in order to pass through the structure, and the concave-convex matching structure of the annular protrusion and the annular groove can increase the structural adhesive bonding area and bonding path length between the upper insulating member and the top cover, so that the connection structure between the upper insulating member and the top cover forms a second waterproof seal, thereby greatly improving the waterproof sealing performance between the upper insulating member and the top cover, that is, avoiding the problem of battery cell sealing failure in the battery cell top cover assembly.

[0024] In addition, the utility model also provides a battery module, including a battery cell top cover assembly, wherein the battery cell top cover assembly is the battery cell top cover assembly described in any of the above schemes. Since the above battery cell top cover assembly has the above technical effects, the battery module having the battery cell top cover assembly should also have the corresponding technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the axial structure of a battery cell top cover assembly provided in an embodiment of the utility model;

[0027] Figure 2 A schematic diagram of the top view of the battery cell top cover assembly provided in an embodiment of the utility model;

[0028] Figure 3 for Figure 2 AA cross-sectional structural diagram;

[0029] Figure 4A schematic diagram of a partially enlarged structure of a sealing structure of a battery cell top cover assembly corresponding to a pole position provided by an embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the split structure of the battery cell top cover assembly provided in an embodiment of the utility model;

[0031] Figure 6 A schematic diagram of the axial structure of the upper insulating member provided in an embodiment of the utility model;

[0032] Figure 7 A schematic diagram of the axial structure of the top cover provided in an embodiment of the utility model.

[0033] in, Figure 1-Figure 7 middle:

[0034] Top cover 1, mounting hole 11, annular groove 12, first positioning structure 13;

[0035] The upper insulating member 2, the sealing through hole 21, the radial protrusion 210, the fitting end surface 22, the annular protrusion 23, and the annular embedding portion 24;

[0036] Pole 3;

[0037] A second preset gap 41 and a third preset gap 42;

[0038] Conductive sheet 5;

[0039] Insulation sealing ring 6;

[0040] The lower insulating member 7 , the avoidance opening 71 , the limiting structure 72 , and the second positioning structure 73 . DETAILED DESCRIPTION

[0041] The core of the utility model is to provide a battery cell top cover assembly and a battery module to solve the problem that the battery cell top cover assembly is prone to battery cell sealing failure.

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] Reference Figure 1-Figure 7The utility model provides a battery cell top cover assembly, including a top cover 1 and an upper insulating member 2, wherein the top cover 1 has a mounting through hole 11 and an annular groove 12, wherein the mounting through hole 11 is mainly used for the pole 3 to pass through, and the annular groove 12 is arranged on the top surface of the top cover 1 and is configured to surround the periphery of the mounting through hole 11; the upper insulating member 2 has a sealing through hole 21 and a fitting end face 22, wherein the sealing through hole 21 is mainly used for sealing and fitting with the pole 3, the fitting end face 22 is arranged on a side of the upper insulating member 2 facing the top cover 1 and is used to be bonded to the top surface of the top cover 1 by structural adhesive, and an annular protrusion 23 is arranged on the fitting end face 22, and the annular protrusion 23 is configured to fit and bond with the annular groove 12.

[0044] In actual application of the battery cell top cover assembly, since the upper insulating member 2 has a fitting end face 22, and the fitting end face 22 is bonded to the top surface of the top cover 1 by structural adhesive, a first waterproof seal can be formed between the upper insulating member 2 and the top cover 1; in addition, since an annular protrusion 23 is provided on the fitting end face 22, through the adaptive bonding of the annular protrusion 23 and the annular groove 12, water needs to cross a trench structure formed by the concave-convex matching between the two to pass through the structure, and the concave-convex matching structure of the annular protrusion 23 and the annular groove 12 can increase the structural adhesive bonding area and bonding path length between the upper insulating member 2 and the top cover 1, so that the connection structure between the upper insulating member 2 and the top cover 1 forms a second waterproof seal, thereby greatly improving the waterproof sealing performance between the upper insulating member 2 and the top cover 1, that is, avoiding the problem of battery cell sealing failure in the battery cell top cover assembly.

[0045] It should be noted that those skilled in the art should be able to understand that the battery cell top cover assembly generally also includes a lower insulating member 7 arranged on the bottom surface of the top cover 1 and a conductive sheet 5 connected to the bottom of the pole 3. Among them, the lower insulating member 7 is mainly used to ensure the electrical insulation inside the battery cell top cover assembly to prevent the current from flowing in places where it should not flow, thereby improving the safety of the battery cell. The conductive sheet 5 is usually made of a metal material with good conductive properties, such as copper, aluminum or its alloys, which has good conductivity and mechanical strength, and can ensure that the current is smoothly transmitted between the pole 3 and the external circuit, while withstanding certain mechanical pressure and vibration. In addition, the design of the conductive sheet 5 usually takes into account the close fit and good contact with the pole 3 to ensure the stability and efficiency of current transmission. At the same time, it also needs to have certain corrosion resistance and oxidation resistance to cope with various challenges in the battery working environment.

[0046] It should also be noted that the upper insulating member 2 and the lower insulating member 7 can be made of, but not limited to, insulating plastics, as long as the required electrical insulation can be ensured. The top cover 1 can be made of, but not limited to, a bare aluminum plate, such as stainless steel, copper alloy, titanium alloy, etc. These materials have the characteristics of good electrical conductivity, corrosion resistance, high mechanical strength, good processing performance, etc. to varying degrees, but the specific selection still needs to be comprehensively considered based on the actual needs of the battery cell top cover assembly.

[0047] In some specific embodiments, the annular groove 12 is constructed as a circular ring groove, and the number of rings of the circular ring groove is at least one, that is, the number of rings of the circular ring groove can be one ring or multiple rings. The advantage of designing it as one ring is that the structure is simple and the processing is convenient, and the advantage of designing it as multiple rings is that the sealing performance is higher. The specific number of rings can be configured according to actual needs.

[0048] In a further implementation scheme, when the number of rings of the above-mentioned annular groove is designed to be multiple rings, the annular protrusion 23 can be designed to be compatible with at least one ring of the annular groove, that is, the annular protrusion 23 can be compatible with part of the multiple rings of the annular groove. At this time, the annular groove that is not compatible with the annular protrusion 23 can accommodate the structural adhesive, and the sealing and waterproof performance can be improved by the structural adhesive; the annular protrusion 23 can also be compatible with the number of rings of the annular groove one by one, which is equivalent to forming a plurality of trench structures formed by a plurality of concave and convex matching, which also helps to improve the waterproof sealing performance. In actual application, the configuration can be selected according to actual needs.

[0049] In a further embodiment, each annular groove is preferably designed to be arranged concentrically, and the groove spacing between two adjacent annular grooves is preferably designed to be equal. By designing the above structure, on the one hand, the processing and manufacturing of multiple annular grooves is relatively convenient, and it helps to ensure the overall balance and stability of the sealing and waterproof performance.

[0050] In some specific embodiments, the matching structure between the annular protrusion 23 and the annular groove 12 is preferably configured such that the protrusion height of the annular protrusion 23 does not exceed the groove depth of the annular groove 12. By designing such a structural form, it is helpful to better fit and bond the fitting end surface 22 and the top surface of the top cover 1, and avoid the occurrence of gaps that affect the sealing performance.

[0051] In a further embodiment, when the annular protrusion 23 and the annular groove 12 are adapted and bonded, a first preset gap for accommodating the structural adhesive may be provided between the raised top surface of the annular protrusion 23 and the groove bottom surface of the annular groove 12. By matching the structure of the annular groove 12 itself with the first preset gap, the raised top surface of the annular protrusion 23 and the groove bottom surface of the annular groove 12 can retain sufficient structural adhesive when the annular groove 12 and the annular protrusion 23 are adapted, so that the structural adhesive at this position can achieve a better sealing effect.

[0052] In some other specific embodiments, referring to Figure 4 , the matching structure of the annular protrusion 23 and the annular groove 12 can be configured such that the protrusion width of the annular protrusion 23 is smaller than the groove width of the annular groove 12. Specifically, when the annular protrusion 23 and the annular groove 12 are matched and bonded, a second preset gap 41 for accommodating the structural adhesive is provided between the inner annular wall of the annular protrusion 23 and the inner annular wall of the annular groove 12; or a third preset gap 42 for accommodating the structural adhesive is provided between the outer annular wall of the annular protrusion 23 and the outer annular wall of the annular groove 12. Through the arrangement of the second preset gap 41 and / or the third preset gap 42, a certain space can be formed in the annular groove 12 to retain the structural adhesive, and the structural adhesive in the space can also improve the sealing and waterproofing effect.

[0053] In some more specific embodiments, reference Figure 4 Combination Figure 6 As shown, the bottom of the upper insulating member 2 corresponding to the sealing through hole 21 can be provided with an annular embedding portion 24 that fits and fits with the inner hole wall of the mounting through hole 11. Through the design of the annular embedding portion 24, the upper insulating member 2 can form a better insulation effect between the pole 3 and the mounting through hole 11, and at the same time, a fitting surface is added, which helps to improve the sealing and waterproof performance.

[0054] In a further implementation scheme, the bottom of the above-mentioned pole 3 is generally connected to a conductive sheet 5, and an insulating sealing ring 6 can be arranged between the conductive sheet 5 and the bottom surface of the top cover 1 to ensure insulation performance, wherein the insulating sealing ring 6 is preferably designed to partially fit with the bottom surface of the annular embedded portion 24, so that the insulating sealing ring 6 can block the matching gap between the annular embedded portion 24 and the mounting hole 11, further improving the sealing and waterproof performance.

[0055] In a further implementation scheme, the battery cell top cover assembly generally also includes a lower insulating member 7 arranged on the bottom surface of the top cover 1, and the lower insulating member 7 is provided with an avoidance opening 71 for avoiding the installation via 11 and the insulating sealing ring 6. The outer edge of the avoidance opening 71 can be provided with a limiting structure 72 for limiting the conductive sheet 5, thereby enhancing the stability of the structural arrangement of the conductive sheet 5.

[0056] In some other specific embodiments, a radial protrusion 210 arranged circumferentially may be provided in the middle of the inner hole wall of the sealing through hole 21, and the pole 3 may be riveted to the radial protrusion 210, wherein the radial protrusion 210 may be designed as an annular protrusion structure arranged throughout the circumference, or may be designed as a plurality of radial protrusion structures arranged at intervals along the circumference, and its main function is to achieve axial positioning of the fixed pole 3. Among them, the radial protrusion 210 is designed as an annular protrusion structure arranged throughout the circumference, which helps to improve the sealing and waterproof performance between the upper insulating member 2 and the pole 3.

[0057] In addition, in order to improve the assembly positioning between the top cover 1 and the lower insulating member 7, refer to Figure 4 As shown, the bottom surface of the top cover 1 may be provided with a first positioning structure 13 at a position corresponding to the mounting hole 11, and the lower insulating member 7 may be provided with a second positioning structure 73 adapted to the first positioning structure 13. Among them, one of the first positioning structure 13 and the second positioning structure 73 may be designed as a positioning protrusion structure, and the other may be designed as a positioning groove structure. In actual application, the configuration may be selected according to actual needs, and no further specific limitation is made here.

[0058] In addition, the utility model also provides a battery module, including a battery cell top cover assembly, wherein the battery cell top cover assembly is the battery cell top cover assembly described in any of the above schemes. Since the above battery cell top cover assembly has the above technical effects, the battery module having the battery cell top cover assembly should also have the corresponding technical effects, which will not be described in detail here.

[0059] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0060] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0061] In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0063] Specific examples are used herein to illustrate the principles and implementation methods of the present invention, and the description of the above embodiments is only used to help understand the core idea of ​​the present invention. Although the present application has been described with reference to the preferred embodiments, various improvements may be made thereto and components thereof may be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments may be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell top cover assembly, characterized in that: include: A top cover (1) having a mounting hole (11) and an annular groove (12), wherein the mounting hole (11) is used for a pole (3) to pass through, and the annular groove (12) is arranged on the top surface of the top cover (1) and is configured to surround the periphery of the mounting hole (11); The upper insulating member (2) has a sealing through hole (21) and a fitting end surface (22), wherein the sealing through hole (21) is used for sealing and fitting with the pole (3), the fitting end surface (22) is arranged on the side of the upper insulating member (2) facing the top cover (1) and is used for bonding to the top surface of the top cover (1) by means of structural adhesive, and an annular protrusion (23) is arranged on the fitting end surface (22), and the annular protrusion (23) is configured to fit and bond with the annular groove (12).

2. The battery cell top cover assembly according to claim 1, characterized in that: The annular groove (12) is configured as a circular annular groove, and the number of rings of the circular annular groove is at least one.

3. The battery cell top cover assembly according to claim 2, characterized in that: The annular groove has multiple rings, and the annular protrusion (23) is matched with at least one ring of the annular groove.

4. The battery cell top cover assembly according to claim 3, characterized in that: The annular grooves are arranged concentrically, and the groove spacing between two adjacent annular grooves is equal.

5. The battery cell top cover assembly according to claim 1, characterized in that: The matching structure between the annular protrusion (23) and the annular groove (12) is configured such that the protrusion height of the annular protrusion (23) does not exceed the groove depth of the annular groove (12).

6. The battery cell top cover assembly according to claim 5, characterized in that: When the annular protrusion (23) and the annular groove (12) are adapted and bonded, a first preset gap for accommodating the structural adhesive is provided between the raised top surface of the annular protrusion (23) and the groove bottom surface of the annular groove (12).

7. The battery cell top cover assembly according to claim 1, characterized in that: The matching structure between the annular protrusion (23) and the annular groove (12) is configured such that the protrusion width of the annular protrusion (23) is smaller than the groove width of the annular groove (12).

8. The battery cell top cover assembly according to claim 7, characterized in that: When the annular protrusion (23) and the annular groove (12) are adapted to be bonded, a second preset gap (41) is provided between the inner annular wall of the annular protrusion (23) and the inner annular wall of the annular groove (12) for accommodating the structural adhesive; and / or a third preset gap (42) is provided between the outer annular wall of the annular protrusion (23) and the outer annular wall of the annular groove (12) for accommodating the structural adhesive.

9. The battery cell top cover assembly according to claim 1, characterized in that: The upper insulating member (2) is provided with an annular embedding portion (24) corresponding to the bottom of the sealing through hole (21) and is fitted and embedded with the inner hole wall of the mounting through hole (11).

10. The battery cell top cover assembly according to claim 9, characterized in that: A conductive sheet (5) is connected to the bottom of the pole (3), an insulating sealing ring (6) is provided between the conductive sheet (5) and the bottom surface of the top cover (1), and a portion of the insulating sealing ring (6) is in contact with the bottom surface of the annular embedded portion (24).

11. The battery cell top cover assembly according to claim 10, characterized in that: It also includes a lower insulating member (7) arranged on the bottom surface of the top cover (1), the lower insulating member (7) being provided with an escape opening (71) for evading the mounting hole (11) and the insulating sealing ring (6), and the outer edge of the escape opening (71) being provided with a limiting structure (72) for limiting the conductive sheet (5).

12. The battery cell top cover assembly according to claim 1, characterized in that: A radial convex portion (210) arranged along the circumferential direction is provided in the middle of the inner hole wall of the sealing through hole (21), and the pole (3) is riveted to the radial convex portion (210); And / or, the top cover (1) is configured as a plain aluminum plate; And / or, the upper insulating member (2) is configured as an insulating plastic member; And / or, it also includes a lower insulating member (7) arranged on the bottom surface of the top cover (1), and the lower insulating member (7) is configured as an insulating plastic member, and / or, a first positioning structure (13) is arranged on the bottom surface of the top cover (1) at a position corresponding to the mounting hole (11), and the lower insulating member (7) is provided with a second positioning structure (73) adapted to the first positioning structure (13).

13. A battery module, comprising a battery cell top cover assembly, characterized in that: The battery cell top cover assembly is the battery cell top cover assembly as described in any one of claims 1-12.

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