Top cover structure and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover structure and a battery, the top cover structure comprises a cover plate body, an anti-explosion valve and a shield part, the cover plate body is provided with an anti-explosion hole matched with the anti-explosion valve, and the shield part covers the anti-explosion hole from the inner side of the cover plate body; the protective cover part is provided with a first air hole for air to pass through. According to the top cover structure and the battery provided by the invention, on one hand, the protective cover part covering the anti-explosion hole is arranged on the inner side of the cover plate body, so that the anti-explosion valve is effectively protected through the protective cover part, direct impact of electrolyte in the battery on the anti-explosion valve is blocked and relieved, and the phenomenon that the anti-explosion valve is damaged when the battery faces the conditions of vibration, shaking, collision, falling and the like is avoided; redundant electrolyte in the battery breaks through the anti-explosion valve; and on the other hand, the shield part is provided with the first air hole, so that the interference of the shield part on the function of the anti-explosion valve is effectively avoided, and the effectiveness of the anti-explosion valve is ensured.

Description

Technical Field

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

[0002] With the development of battery technology, the battery energy storage capacity has gradually increased, and the capacity of the electrolyte loaded inside the battery has gradually increased.

[0003] And nowadays, batteries are usually equipped with explosion-proof valves on the top cover of the battery. In order to ensure the safety of the battery during use, the explosion-proof valve is usually provided with a thinned area that is convenient for high-pressure gas to break through.

[0004] However, when the battery is exposed to vibration, shaking, collision, falling, etc., the excess electrolyte inside the battery will impact the battery casing from the inside. Once it impacts the thinned area of ​​the explosion-proof valve, it is very easy to break through the explosion-proof valve, causing the explosion-proof valve to fail. Utility Model Content

[0005] The purpose of the present application is to provide a top cover structure and a battery, so as to solve to a certain extent the technical problem existing in the prior art that when the battery is faced with vibration, shaking, collision, falling, etc., the excess electrolyte inside the battery will impact the battery shell from the inside, and once it impacts the thinned area of ​​the explosion-proof valve, it is very easy to break through the explosion-proof valve, causing the explosion-proof valve to fail.

[0006] According to the first aspect of the present application, a top cover structure is provided, including a cover body, an explosion-proof valve and a protective cover part, the cover body is provided with an explosion-proof hole cooperating with the explosion-proof valve, the protective cover part is provided on the explosion-proof hole from the inner side of the cover body; the protective cover part is provided with a first air vent for gas to pass through.

[0007] Preferably, there are a plurality of the first air holes, and the plurality of the first air holes are evenly distributed on the shield portion;

[0008] The total area of ​​the first air holes included in the shield portion is greater than or equal to the effective exhaust area of ​​the explosion-proof valve.

[0009] Preferably, the shield portion includes a shield body that is concave toward the inner side of the cover body;

[0010] The bottom surface of the cover body is arranged parallel to the cover plate body;

[0011] And / or, it further includes a patch, which is attached to the outer side of the cover body and covers at least a portion of the explosion-proof valve when the explosion-proof valve is assembled in the explosion-proof hole.

[0012] Preferably, when the explosion-proof valve is assembled in the explosion-proof hole, an accommodation space is formed between the explosion-proof valve and the shield portion.

[0013] Preferably, in a first direction, a size of the accommodating space is greater than or equal to 0.5 mm, and the first direction is perpendicular to the cover plate body.

[0014] Preferably, it further comprises a lower plastic part, and the lower plastic part can cover the inner side of the cover body;

[0015] The lower plastic part includes an insulating cover, which can be arranged on a side of the protective cover portion facing away from the explosion-proof valve. The insulating cover is provided with a second air vent that passes through the insulating cover, and the second air vent can expose the first air vent.

[0016] Preferably, a first convex rib is provided inside the insulating cover, and the first convex rib protrudes from the bottom surface of the inner side of the insulating cover toward the inside of the insulating cover;

[0017] The first rib abuts against the shield portion.

[0018] Preferably, the cover body is provided with a liquid injection hole, and the liquid injection hole and the explosion-proof hole are respectively provided at two ends of the cover body in a second direction, and the second direction is an extension direction of the cover body;

[0019] The lower plastic part further comprises a buffer cover, which is arranged on the liquid injection hole from the inner side of the cover body, and the buffer cover is provided with a liquid passing hole penetrating the buffer cover.

[0020] Preferably, in the first direction, the size of the insulating cover is equal to the size of the buffer cover.

[0021] According to the second aspect of the present application, a battery is provided, comprising a top cover structure as described in any of the above technical solutions, and thus having all the beneficial technical effects of the top cover structure, which will not be described in detail herein.

[0022] Compared with the prior art, the beneficial effects of this application are:

[0023] The top cover structure provided by the present application, on the one hand, is provided with a shield portion which is covered on the explosion-proof hole from the inner side of the cover plate body, so as to effectively protect the explosion-proof valve through the shield portion, block and alleviate the direct impact of the electrolyte inside the battery on the explosion-proof valve, and prevent the excess electrolyte inside the battery from breaking through the explosion-proof valve when the battery is facing vibration, shaking, collision, falling, etc.; on the other hand, by arranging the first air vent in the shield portion, the interference of the shield portion on the function of the explosion-proof valve is effectively avoided, thereby ensuring the effectiveness of the explosion-proof valve.

[0024] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 1 A schematic diagram of the exploded structure of the top cover structure provided in an embodiment of the present application;

[0027] Figure 2 A schematic diagram of the axonometric structure of the top cover structure provided in an embodiment of the present application;

[0028] Figure 3 A schematic cross-sectional structure diagram of the top cover structure provided in an embodiment of the present application obtained by cutting the insulating cover along a plane defined by the first direction and the third direction;

[0029] Figure 4 A schematic cross-sectional structure diagram of the top cover structure provided in an embodiment of the present application obtained by cutting the buffer cover along a plane defined by the first direction and the third direction.

[0030] Reference numerals:

[0031] 1-cover body; 11-explosion-proof hole; 12-liquid injection hole; 13-shield; 131-first air hole; 132-accommodation space; 2-explosion-proof valve; 3-pole assembly; 31-riveted cap; 32-riveted main body; 41-lower plastic part; 42-insulating cover; 421-second air hole; 422-first convex rib; 43-buffer cover; 431-liquid hole; 432-second convex rib; 51-upper plastic part; 52-insulating sealing ring; 6-patch.

[0032] F1-first direction; F2-second direction; F3-third direction. DETAILED DESCRIPTION

[0033] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0034] The components of the embodiments of the present application generally described and shown in the drawings herein may 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 application claimed, but merely represents the selected embodiments of the present application.

[0035] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0036] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] Refer to the following Figures 1 to 4 The top cover structure and the battery according to some embodiments of the present application are described.

[0039] See also Figures 1 to 4As shown, an embodiment of the first aspect of the present application provides a top cover structure, which includes a cover body 1, an explosion-proof valve 2 and a shield portion 13, the cover body 1 is provided with an explosion-proof hole 11 cooperating with the explosion-proof valve 2, and the shield portion 13 is provided on the explosion-proof hole 11 from the inner side of the cover body 1; the shield portion 13 is provided with a first air hole 131 for gas to pass through, so that, according to the top cover structure provided by the above technical features, on the one hand, the shield portion 13 provided on the explosion-proof hole 11 is provided from the inner side of the cover body 1, so as to effectively protect the explosion-proof valve 2 through the shield portion 13, block and alleviate the direct impact of the electrolyte inside the battery on the explosion-proof valve 2, and avoid the excess electrolyte inside the battery from breaking through the explosion-proof valve 2 when the battery is facing vibration, shaking, collision, falling, etc.; on the other hand, by providing the first air hole 131 in the shield portion 13, the interference of the shield portion 13 on the function of the explosion-proof valve 2 is effectively avoided, thereby ensuring the effectiveness of the explosion-proof valve 2.

[0040] It should be noted that the inner side of the cover body 1 may be understood as the side of the cover body 1 facing the inside of the battery.

[0041] Preferably, if Figure 1 As shown, there are a plurality of the first air holes 131 , and the plurality of first air holes 131 are evenly distributed in the protective cover portion 13 to reduce the influence of the protective cover portion 13 on the function of the explosion-proof valve 2 .

[0042] Furthermore, the total area of ​​the first air holes 131 included in the protective cover portion 13 is greater than or equal to the effective exhaust area of ​​the explosion-proof valve 2 , so as to further reduce the influence of the protective cover portion 13 on the function of the explosion-proof valve 2 .

[0043] It should be noted that the effective exhaust area of ​​the explosion-proof valve 2 is a battery design parameter determined based on parameters such as the battery capacity and the electrolyte volume of the battery. It is an existing parameter of the battery and will not be described in detail here.

[0044] Preferably, if Figure 1 As shown, the shield portion 13 may include a shield body that is concave toward the inner side of the cover body 1. In this way, an installation space is reserved for the installation of the explosion-proof valve 2, which can facilitate the installation of the explosion-proof valve 2.

[0045] Preferably, if Figure 3 As shown, when the explosion-proof valve 2 is assembled in the explosion-proof hole 11, a receiving space 132 is formed between the explosion-proof valve 2 and the protective cover portion 13. When the electrolyte enters the protective cover portion 13 through the first air hole 131, the electrolyte can be temporarily stored and buffered through the receiving space 132, further preventing the electrolyte from directly impacting the explosion-proof valve 2.

[0046] It should be noted that the first air holes 131 may be provided on the bottom and side surfaces of the cover body to ensure that the total area of ​​the first air holes 131 is greater than or equal to the effective exhaust area of ​​the explosion-proof valve 2 .

[0047] Preferably, if Figure 1 As described above, the bottom surface of the cover body can be arranged in parallel with the cover body 1, so as to increase the volume of the cover body and further improve the ability of the cover body to contain electrolyte.

[0048] It should be noted that the above-mentioned cover body is not limited to the form in which the bottom surface is parallel to the cover body 1. As long as it can ensure that the protective cover part 13 can buffer the impact of the electrolyte on the explosion-proof valve 2, the above-mentioned cover body can also be hemispherical, semi-ellipsoidal, cylindrical, polygonal or other irregular mesh shapes.

[0049] Preferably, if Figure 3 As shown, in the first direction F1 , the size of the buffer space is greater than or equal to 0.5 mm, wherein the first direction F1 is perpendicular to the cover body 1 .

[0050] like Figures 1 to 4 , F1 shown in the figure may be an example of the first direction F1. For the convenience of description, two mutually perpendicular directions on a plane parallel to the cover body 1 are defined as a second direction F2 and a third direction F3. Preferably, the extension direction of the cover body 1 may be the second direction F2, F2 shown in the figure may be an example of the second direction F2, and F3 shown in the figure may be an example of the third direction F3.

[0051] Alternatively, if Figure 1 As shown, the shield portion 13 may also be provided with a flange parallel to the cover body 1 , and the shield portion 13 can be fitted with the cover body 1 via the flange to achieve fixation of the shield portion 13 .

[0052] Optionally, the flange and the cover body are integrally connected.

[0053] Optionally, the shield portion 13 and the explosion-proof valve 2 may be respectively connected to the cover plate body 1 by welding.

[0054] Preferably, if Figures 1 to 3 As shown, the above-mentioned top cover structure can also include a patch 6. When the explosion-proof valve 2 is assembled in the explosion-proof hole 11, the patch 6 is attached to the outer side of the cover body 1 and covers at least part of the explosion-proof valve 2 to cover the explosion-proof valve 2 and improve the aesthetics and neatness of the top cover structure.

[0055] Preferably, if Figure 2As described above, when the patch 6 is attached to the explosion-proof valve 2 , at least a portion of the explosion-proof valve 2 is exposed by the patch 6 , thereby ensuring smooth exhaust of the explosion-proof valve 2 and preventing the patch 6 from affecting the explosion-proof function of the explosion-proof valve 2 .

[0056] In an embodiment, Figures 1 to 3 As shown, the top cover structure may further include a lower plastic part 41 , and the lower plastic part 41 may cover the inner side of the cover body 1 to insulate the cover body 1 .

[0057] Preferably, if Figure 1 The lower plastic part 41 may include an insulating cover 42, which can be disposed on the side of the shield portion 13 facing away from the explosion-proof valve 2 to insulate the shield portion 13. Correspondingly, the insulating cover 42 is provided with a second vent hole 421 penetrating the insulating cover 42, and the second vent hole 421 can expose the first vent hole 131, thereby effectively ensuring the air permeability of the first vent hole 131.

[0058] Preferably, if Figure 1 As shown, a first rib 422 is disposed in the insulating cover 42 . The first rib 422 protrudes from the bottom surface of the inner side of the insulating cover 42 toward the inside of the insulating cover 42 to improve the supporting strength of the insulating cover 42 .

[0059] Preferably, if Figure 3 As shown, the first rib 422 and the shield portion 13 are in contact with each other. Thus, on the one hand, the first rib 422 can effectively support the shield portion 13 to ensure the assembly stability of the shield portion 13; on the other hand, it can effectively prevent the insulating cover 42 and the shield portion 13 from making abnormal noises due to collision during battery vibration and / or electrolyte impact.

[0060] Preferably, if Figure 1 As shown, the cover body 1 may be provided with a liquid injection hole 12 to replenish the electrolyte of the battery.

[0061] Correspondingly, if Figure 1 and Figure 2 As shown, the lower plastic part 41 may further include a buffer cover 43, which is arranged on the injection hole 12 from the inner side of the cover body 1, and the buffer cover 43 is provided with a liquid hole 431 passing through the buffer cover 43, so that not only the smoothness of the injection of the injection hole 12 is ensured, but also the impact of the electrolyte on the injection hole 12 during the vibration process, resulting in the overflow of the electrolyte from the injection hole 12, is effectively reduced.

[0062] Preferably, if Figure 1 and Figure 2As shown, the above-mentioned injection hole 12 and explosion-proof hole 11 can be respectively arranged at the two ends of the cover body 1 in the second direction F2. In this way, the insulating cover 42 and the buffer cover 43 are respectively arranged on the two sides of the lower plastic part 41 in the second direction F2, which effectively avoids the eccentricity of the center of gravity of the lower plastic part 41, thereby improving the setting stability of the lower plastic part 41.

[0063] Similarly, if Figure 1 As shown, the buffer cover 43 may also be provided with a second rib 432 protruding from the bottom surface of the inner side of the buffer cover 43 toward the inside of the buffer cover 43 to ensure the support strength of the buffer cover 43.

[0064] Preferably, if Figure 1 and Figure 2 As described above, in the first direction F1, the size of the insulating cover 42 is equal to that of the buffer cover 43. On the one hand, it is convenient for injection molding of the lower plastic part 41; on the other hand, the position of the electrode group inside the battery can be limited by the bottom surfaces of the insulating cover 42 and the buffer cover 43.

[0065] Optionally, the first convex rib 422 and the second convex rib 432 may both include longitudinal ribs extending along the second direction F2.

[0066] Optionally, the first convex rib 422 and the second convex rib 432 may both include transverse ribs extending along the third direction F3.

[0067] In an embodiment, Figure 1 , Figure 2 and Figure 4 As shown, the above-mentioned top cover structure can also include a pole assembly 3, which can include a riveted cap 31 and a riveted body 32. The riveted body 32 can penetrate the cover body 1 from the inner side of the cover body 1. The riveted cover is arranged on the outer side of the cover body 1. The above-mentioned riveted body 32 and the riveted cap 31 can be fixed by riveting.

[0068] Preferably, if Figure 1 and Figure 4 The top cover structure may further include an upper plastic part 51 , which is disposed between the riveted cap 31 and the cover body 1 to achieve insulation between the riveted cap 31 and the cover body 1 .

[0069] Preferably, if Figure 1 and Figure 4The above-mentioned top cover structure may also include an insulating sealing ring 52, the two ends of which in the first direction F1 are respectively connected to the upper plastic part 51 and the lower plastic part 41, and the insulating sealing ring 52 is sleeved on the outside of the riveted body 32, and can seal the gap between the riveted body 32 and the cover body 1 to ensure the insulation between the pole assembly 3 and the cover body and the sealing of the cover body.

[0070] like Figure 1 and Figure 2 As shown, an example of a riveted cap 31 being fixed via two riveted bodies 32 is shown, but it is not limited to this. The number of riveted bodies 32 set on a riveted cap 31 can be adaptively adjusted according to the size of the riveted cap 31. For example, 1, 3, 4 or more riveted bodies 32 can be set on a riveted cap 31.

[0071] It should be noted that Figure 1 and Figure 2 Only an example of a top cover structure with one pole assembly 3 is shown, but it is not limited to this. The number of pole assemblies 3 provided in the top cover structure can be adjusted according to the different adaptability of the battery types. For example, the top cover structure can also be provided with two pole assemblies 3, wherein the polarities of the two pole assemblies 3 are opposite.

[0072] The embodiment of the second aspect of the present application further provides a battery, comprising the top cover structure described in any of the above embodiments, and thus having all the beneficial technical effects of the top cover structure, which will not be repeated here.

[0073] Preferably, not shown in the figures, the battery may further include a shell, an electrode group and an electrolyte, the top cover structure is disposed on one end of the shell, and the electrode group and the electrolyte may be disposed inside the shell.

[0074] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A top cover structure, characterized in that: It includes a cover body, an explosion-proof valve and a shield part. The cover body is provided with an explosion-proof hole matched with the explosion-proof valve. The shield part is provided on the inner side of the cover body to cover the explosion-proof hole. The shield part is provided with a first air vent for gas to pass through.

2. The top cover structure according to claim 1, characterized in that: There are a plurality of first air holes, and the plurality of first air holes are evenly distributed on the protective cover portion; The total area of ​​the first air holes included in the shield portion is greater than or equal to the effective exhaust area of ​​the explosion-proof valve.

3. The top cover structure according to claim 1, characterized in that: The shield portion includes a shield body recessed toward the inner side of the cover body; The bottom surface of the cover body is arranged parallel to the cover plate body; And / or, it further includes a patch, which is attached to the outer side of the cover body and covers at least a portion of the explosion-proof valve when the explosion-proof valve is assembled in the explosion-proof hole.

4. The top cover structure according to claim 1, characterized in that: When the explosion-proof valve is mounted in the explosion-proof hole, an accommodation space is formed between the explosion-proof valve and the shield portion.

5. The top cover structure according to claim 4, characterized in that: In a first direction, a size of the accommodation space is greater than or equal to 0.5 mm, and the first direction is perpendicular to the cover body.

6. The roof structure according to any one of claims 1 to 5, characterized in that: It also includes a lower plastic part, which can cover the inner side of the cover body; The lower plastic part includes an insulating cover, which can be arranged on a side of the protective cover portion facing away from the explosion-proof valve. The insulating cover is provided with a second air vent that passes through the insulating cover, and the second air vent can expose the first air vent.

7. The top cover structure according to claim 6, characterized in that: A first convex rib is provided in the insulating cover, and the first convex rib protrudes from the bottom surface of the inner side of the insulating cover toward the inside of the insulating cover; The first rib abuts against the shield portion.

8. The top cover structure according to claim 6, characterized in that: The cover body is provided with a liquid injection hole, and the liquid injection hole and the explosion-proof hole are respectively arranged at two ends of the cover body in a second direction, and the second direction is an extension direction of the cover body; The lower plastic part further comprises a buffer cover, which is arranged on the liquid injection hole from the inner side of the cover body, and the buffer cover is provided with a liquid passing hole penetrating the buffer cover.

9. The top cover structure according to claim 8, characterized in that: In the first direction, the size of the insulating cover is equal to the size of the buffer cover.

10. A battery, characterized in that: A top cover structure comprising any one of claims 1 to 9.

Images