Top cover assembly and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery. The top cover assembly comprises a cover plate, a first insulating piece and a connecting piece, the cover plate and the pole group are arranged from outside to inside and are provided with a through hole, the first insulating piece comprises a first separation part and a second separation part, at least part of the second separation part is accommodated in the through hole, and the cover plate and the pole group are located on the two sides of the first separation part; the connecting piece is arranged on the first insulating piece and located on the outer side of the cover plate, and the connecting piece and the cover plate are arranged at an interval, so that the connecting piece is connected with the pole outside the battery, the situation that the connecting piece is arranged in the battery to occupy the internal space of the battery and influence the height of the pole group in the shell is avoided, and the energy density of the battery is further improved; in addition, the first insulating part can insulate the cover plate and the pole group, and the first insulating part can also insulate the cover plate and the connecting part. The battery has relatively high energy density by applying the top cover assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a top cover assembly and a battery. Background Art

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] like Figure 2 As shown, the battery 100 includes a shell 300, an electrode group 200 and a top cover assembly 100. The electrode group 200 is arranged inside the shell 300, and the top cover assembly 100 is covered on the shell 300. The top cover assembly 100 includes a pole 50 and a connector 40. A pole ear 210 is provided on the pole group 200. The pole ear 210 and the pole 50 are connected by the connector 40. In the prior art, the connector 40 is usually arranged inside the shell 300, occupying a part of the space inside the shell 300, affecting the height of the pole group 200 in the shell 300, and thus affecting the energy density of the battery 1000.

[0004] Therefore, there is an urgent need for a top cover assembly and a battery to solve the above problems. Utility Model Content

[0005] The purpose of the present utility model is to provide a top cover assembly and a battery, which can better achieve insulation inside the battery, achieve insulation between the connector and the cover plate outside the battery, and at the same time improve the space utilization inside the battery, so that the battery has a higher energy density.

[0006] To achieve the above objectives, the following technical solutions are provided:

[0007] A top cover assembly, capable of cooperating with the electrode group, comprising:

[0008] a cover plate, arranged with the electrode group from outside to inside and having a through hole;

[0009] a first insulating member comprising a first partition and a second partition, at least a portion of the second partition being accommodated in the through hole, the cover plate and the electrode group being located on both sides of the first partition; and

[0010] A connecting member is provided on the first insulating member and is located outside the cover plate, and the connecting member is spaced apart from the cover plate.

[0011] As an optional solution, the first partition includes:

[0012] A first insulating layer, comprising a first insulating layer body and a reinforcement portion provided thereon, wherein the first insulating layer body is a flat plate structure; and / or

[0013] The second insulating layer is a flat plate structure.

[0014] As an optional solution, the thickness of the first insulating layer is greater than or equal to 0.5 mm and less than or equal to 2 mm; and / or

[0015] The thickness of the second insulating layer is greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0016] As an optional solution, a leakage hole is provided on the main body of the first insulating layer, and the leakage hole is located between the cover plate and the electrode group.

[0017] As an optional solution, the second partition is provided with a receiving groove, and the connecting member is arranged in the receiving groove.

[0018] As an optional solution, a tab accommodating area is provided on a side of the first partition facing away from the cover plate, the electrode group includes tabs, and at least a portion of the tabs are accommodated in the tab accommodating area.

[0019] As an optional solution, the first insulating member is provided with a pole lug hole, the pole group includes a pole lug, one end of the pole lug is connected to the pole group, the other end of the pole lug is connected to the connecting member, and at least part of the pole lug is accommodated in the pole lug hole.

[0020] As an optional solution, the top cover assembly further includes:

[0021] The explosion-proof mechanism is arranged on the cover plate. The first insulating member is provided with an air vent, and the air vent is directly opposite to the explosion-proof mechanism.

[0022] As an optional solution, the first partition and the second partition are integrally formed or have a separate structure.

[0023] The battery comprises a shell and an electrode group, and also comprises the above-mentioned top cover assembly. The electrode group is arranged in the shell, and the top cover assembly is covered on the shell.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] In the top cover assembly provided by the present invention, the cover plate has a through hole, the cover plate and the pole group are arranged from the outside to the inside and have a through hole, the first insulating member includes a first partition and a second partition, at least a portion of the second partition is accommodated in the through hole, the cover plate and the pole group are located on both sides of the first partition; the connecting member is provided on the first insulating member and is located on the outside of the cover plate, the connecting member and the cover plate are spaced apart, so as to realize the connection of the connecting member to the pole column on the outside of the battery, avoid the connecting member being provided inside the battery and occupying the internal space of the battery, avoid affecting the height of the pole group in the shell, and thus improve the energy density of the battery; in addition, the first insulating member can insulate the cover plate and the pole group, and the first insulating member can also insulate the cover plate and the connecting member.

[0026] The battery provided by the utility model has a higher energy density by applying the above-mentioned top cover assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0028] Figure 1 A cross-sectional view of a battery provided in an embodiment of the present utility model;

[0029] Figure 2 It is a cross-sectional view of a battery in the prior art;

[0030] Figure 3 A schematic structural diagram of a cover plate and a first insulating member provided in an embodiment of the present utility model;

[0031] Figure 4 This is one of the structural schematic diagrams of the first insulating member provided in an embodiment of the present utility model;

[0032] Figure 5 The second structural diagram of the first insulating member provided in an embodiment of the present utility model;

[0033] Figure 6 The third structural diagram of the first insulating member provided in an embodiment of the present utility model;

[0034] Figure 7 for Figure 6 Cross-sectional view at AA in the middle;

[0035] Figure 8 This is the fourth structural schematic diagram of the first insulating member provided in an embodiment of the present utility model.

[0036] Reference numerals:

[0037] 1000, battery;

[0038] 100. Top cover assembly;

[0039] 10. Cover plate; 11. Through hole; 12. Explosion-proof hole; 13. Liquid injection hole;

[0040] 20. First insulating member; 21. First partition; 211. First insulating layer; 2111. First insulating layer body; 21111. Tab accommodation area; 21112. Liquid leakage hole; 2112. Reinforcement portion; 212. Second insulating layer; 213. Breathing hole; 22. Second partition; 221. Second partition body; 2211. Accommodation groove; 222. Abutment portion; 23. Tab hole;

[0041] 30. Explosion-proof mechanism;

[0042] 40. Connectors;

[0043] 50. Pole;

[0044] 60. Sealing ring;

[0045] 70. Fixed ring;

[0046] 80. Second insulating member;

[0047] 200, pole group; 210, pole ear; 300, shell. DETAILED DESCRIPTION

[0048] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0049] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply 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 a limitation on this application.

[0050] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0051] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0052] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0053] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0054] like Figure 1As shown, this embodiment provides a battery 1000, which includes a shell 300, an electrode group 200 and a top cover assembly 100. The electrode group 200 is arranged inside the shell 300, and the top of the shell 300 is open. The top cover assembly 100 is covered on the open end of the shell 300 to seal the electrode group 200 inside the shell 300. The top cover assembly 100 and the shell 300 form a closed space to encapsulate the electrode group 200.

[0055] There are two pole groups 200, and the two pole groups 200 are housed inside the shell 300. In other embodiments, the number of pole groups 200 can also be one, three, or more, and the multiple pole groups 200 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple pole groups 200 are both connected in series and in parallel. The multiple pole groups 200 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple pole groups 200 is housed in the shell 300; of course, the multiple pole groups 200 can also be first connected in series, in parallel, or in mixed connection to form a battery 1000 module, and the multiple battery 1000 modules are then connected in series, in parallel, or in mixed connection to form a whole, and housed in the shell 300. Adaptive selection can be made according to actual needs and is not limited here.

[0056] The top cover assembly 100 includes a pole 50 and a connector 40. A pole lug 210 is provided on the pole group 200. The pole lug 210 and the pole 50 are connected through the connector 40. The top surface of the pole 50 is connected to the electrical equipment to realize the power supply function of the pole group 200 to the electrical equipment.

[0057] In the prior art, such as Figure 2 As shown, the connector 40 is usually disposed inside the housing 300 , occupying a portion of the space inside the housing 300 , affecting the height of the electrode group 200 inside the housing 300 , and further affecting the energy density of the battery 1000 .

[0058] In order to solve the above problems, Figure 3-Figure 7As shown, the top cover assembly 100 provided in this embodiment also includes a cover plate 10 and a first insulating member 20. The cover plate 10 and the pole group 200 are arranged from the outside to the inside and have a through hole 11. The first insulating member 20 includes a first partition 21 and a second partition 22. At least part of the second partition 22 is accommodated in the through hole 11. The cover plate 10 and the pole group 200 are located on both sides of the first partition 21; the connecting member 40 is arranged on the first insulating member 20 and is located on the outside of the cover plate 10. The connecting member 40 and the cover plate 10 are spaced apart to realize the connection of the connecting member 40 to the pole 50 on the outside of the battery 1000, avoiding the connecting member 40 being arranged inside the battery 1000 and occupying the internal space of the battery 1000, avoiding affecting the height of the pole group 200 in the shell 300, thereby improving the energy density of the battery 1000; in addition, the first insulating member 20 can insulate the cover plate 10 and the pole group 200, and the first insulating member 20 can also insulate the cover plate 10 and the connecting member 40.

[0059] Specifically, if Figure 1 、 Figure 3-Figure 7 As shown, the first separator 21 includes a first insulating layer 211, and the first insulating layer 211 includes a first insulating layer body 2111 and a reinforcement portion 2112 arranged thereon. The first insulating layer body 2111 is a flat plate structure, and the flat plate structure of the first insulating layer body 2111 facilitates the insulation cover 10 and the pole group 200; the reinforcement portion 2112 is a grid structure, which can improve the overall strength of the first insulating layer 211 and prevent the first insulating layer 211 from deforming during use.

[0060] Optionally, a leakage hole 21112 is provided on the first insulating layer body 2111, and the leakage hole 21112 is located between the cover plate 10 and the electrode group 200. The electrolyte can move into the interior of the shell 300 through the leakage hole 21112, thereby preventing the electrolyte from accumulating in the first insulating layer 211 and affecting the later cycle life of the battery 1000.

[0061] In an optional embodiment, as Figure 8 As shown, the first separator 21 includes a second insulating layer 212, which is a flat plate structure and provides insulation between the cover plate 10 and the electrode group 200. In another embodiment, the first separator 21 includes a first insulating layer 211 and a second insulating layer 212, and the second insulating layer 212 is located between the first insulating layer 211 and the cover plate 10, further improving the insulation effect of the first separator 21 on the cover plate 10 and the electrode group 200.

[0062] There are two electrode posts 50, and correspondingly, there are two second separators 22 and two connectors 40. One of the two electrode posts 50 is a positive electrode post, and the other is a negative electrode post. One of the two connectors 40 is a positive connector, and the other is a negative connector. The positive electrode of the electrode assembly 200 is connected to the positive electrode post via the positive connector, and the negative electrode of the electrode assembly 200 is connected to the negative electrode post via the negative connector. The connector 40 is provided on the corresponding second separator 22.

[0063] Optionally, the second partition 22 includes a second partition body 221 and an abutting portion 222 connected to each other, the abutting portion 222 is arranged on the outer peripheral surface of the second partition body 221, the first partition 21 abuts against the inner side surface of the cover plate 10, and the abutting portion 222 passes through the through hole 11 and abuts against the outer side surface of the cover plate 10, so that the first insulating member 20 is firmly connected to the cover plate 10 to prevent the first insulating member 20 from falling off.

[0064] Optionally, the second partition body 221 is provided with a receiving groove 2211, and the connector 40 is arranged in the receiving groove 2211. By arranging the connector 40 in the receiving groove 2211, the second partition 22 has a bearing effect on the connector 40, thereby avoiding displacement of the connector 40 and helping to improve the stability of the connection between the connector 40 and the pole 50; at the same time, it can achieve the reduction of the overall height of the battery 1000.

[0065] Optionally, the thickness of the first insulating layer 211 is greater than or equal to 0.5 mm and less than or equal to 2 mm, so as to avoid the problem of insulation failure caused by the thickness of the first insulating layer 211 being too small; at the same time, to avoid the problem of difficulty in molding, significant weight increase, and increased cost caused by the thickness of the first insulating layer 211 being too large. Exemplarily, the thickness of the first insulating layer 211 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc. In other embodiments, the thickness range of the first insulating layer 211 is not limited to the above range and can be adjusted according to needs.

[0066] Optionally, the thickness of the second insulating layer 212 is greater than or equal to 0.5 mm and less than or equal to 2 mm, so as to avoid the problem of insulation failure caused by the thickness of the second insulating layer 212 being too small; at the same time, to avoid the problem of molding difficulties, increased weight, and increased cost caused by the thickness of the second insulating layer 212 being too large. Exemplary thickness of the second insulating layer 212 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc. In other embodiments, the thickness range of the first insulating layer 211 is not limited to the above range and can be adjusted according to needs.

[0067] Optionally, the thickness of the first insulating layer 211 is greater than or equal to 0.5 mm and less than or equal to 2 mm, and the thickness of the second insulating layer 212 is greater than or equal to 0.5 mm and less than or equal to 2 mm.

[0068] Optionally, a tab accommodating area 21111 is provided on the side of the first partition 21 facing away from the cover plate 10, and at least part of the tab 210 is accommodated in the tab accommodating area 21111. The tab accommodating area 21111 is used to gather the tab 210 to prevent the tab 210 from contacting the shell 300 and causing a short circuit.

[0069] Furthermore, the area of ​​the tab accommodating region 21111 gradually decreases from the inner side of the cover plate 10 to the outer side of the cover plate 10. The area of ​​the tab accommodating region 21111, which is larger, facilitates the retraction of the tab 210, while the area of ​​the tab accommodating region 21111, which is smaller, facilitates the passage of the tab 210.

[0070] Furthermore, the first insulating member 20 is provided with a pole ear hole 23, one end of the pole ear 210 is connected to the pole group 200, and the other end of the pole ear 210 is connected to the connector 40. At least a portion of the pole ear 210 is accommodated in the pole ear hole 23, and the pole ear 210 is connected to the connector 40 through the pole ear hole 23. The first insulating member 20 can achieve insulation between the pole ear 210 and the cover plate 10 to avoid short circuit between the pole ear 210 and the cover plate 10.

[0071] Optionally, the number of the corresponding pole tab hole 23 at each second partition 22 is at least one, and the number of the corresponding pole tab holes 23 at each second partition 22 corresponds to the number of the pole groups 200 .

[0072] Optionally, the top cover assembly 100 further includes an explosion-proof mechanism 30, which is disposed on the cover plate 10. A vent 213 is defined in the first partition 21, which is aligned with the explosion-proof mechanism 30. This allows heat and gas within the battery 1000 to be promptly discharged after the explosion-proof mechanism 30 is properly activated, preventing the housing 300 from rupturing. When the internal pressure of the battery 1000 reaches a predetermined threshold, the explosion-proof mechanism 30 releases the internal pressure, thereby improving the safety of the battery 1000.

[0073] Specifically, the explosion-proof mechanism 30 includes an explosion-proof valve, an explosion-proof hole 12 is opened on the cover plate 10, and the explosion-proof valve is welded in the explosion-proof hole 12. During use, when gas is generated in the shell 300 and the air pressure in the shell 300 reaches the explosion-proof threshold of the explosion-proof valve, the explosion-proof valve ruptures, and the gas is discharged from the explosion-proof hole 12 through the air vent 213, releasing the internal pressure of the shell 300, thereby preventing the shell 300 from exploding.

[0074] The explosion-proof mechanism 30 further includes a protective film, which is covered on the explosion-proof valve. The protective film is used to protect the explosion-proof valve to prevent the explosion-proof valve from being ruptured and failing due to the external pressure of the battery 1000.

[0075] Optionally, the first separator 21 and the second separator 22 may be integrally formed or have separate structures. An integrally formed first insulating member 20 can reduce assembly steps and improve assembly efficiency of the battery 1000; a separate first insulating member 20 facilitates molding and allows for thinning of the first insulating member 20, thereby reducing the impact of an excessively thick first insulating member 20 on the energy density of the battery 1000.

[0076] Optionally, the first insulating member 20 may be of an integrated or split type, which is not specifically limited in this embodiment. It is understood that the split type means that the first insulating member 20 includes at least two insulating split parts.

[0077] like Figure 1 As shown, the cover plate 10 is provided with an injection hole 13, through which electrolyte is injected into the housing 300, immersing the electrode assembly 200 in the electrolyte and enabling the charge and discharge functions of the electrode assembly 200. The injection hole 13 is shaped like a countersunk hole. After the injection hole 13 is completed, the package is inserted into the injection hole 13, and a metal sheet is placed above the injection hole 13 for welding to ensure the sealing performance of the battery 1000. In other embodiments, the housing 300 does not contain electrolyte, but uses a solid electrolyte.

[0078] Optionally, the top cover assembly 100 further includes a sealing ring 60 , at least a sealed portion of which is located in the through hole 11 , and the sealing ring 60 is disposed on the outer periphery of the pole 50 to improve the sealing performance at the pole 50 .

[0079] Optionally, the top cover assembly 100 further includes a retaining ring 70 and a second insulating member 80. The retaining ring 70 is disposed around the pole 50, and the second insulating member 80 covers the outer periphery of the pole 50 and the retaining ring 70. The second insulating member 80 is fixedly connected to the retaining ring 70 to ensure structural stability. In this embodiment, the second insulating member 80 and the pole 50 are molded into a single, integral, encapsulated component via in-mold injection molding. This insulates the pole 50 from the retaining ring 70 and the cover plate 10, providing improved safety.

[0080] Note that throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with those embodiments or examples are included in at least one embodiment or example of the present invention. Throughout this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be incorporated in any suitable manner in any one or more embodiments or examples.

[0081] The above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are readily apparent to those skilled in the art without departing from the scope of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include other equivalent embodiments without departing from the spirit of the present invention. The scope of the present invention is determined by the appended claims.

Claims

1. A top cover assembly, capable of cooperating with the pole group (200), characterized in that: The top cover assembly includes: a cover plate (10) arranged from outside to inside with the electrode group (200) and having a through hole (11); a first insulating member (20), comprising a first partition (21) and a second partition (22), at least a portion of the second partition (22) being accommodated in the through hole (11), and the cover plate (10) and the electrode group (200) being located on both sides of the first partition (21); and A connecting member (40) is provided on the first insulating member (20) and is located outside the cover plate (10), and the connecting member (40) and the cover plate (10) are spaced apart.

2. The top cover assembly according to claim 1, wherein: The first partition (21) comprises: A first insulating layer (211), comprising a first insulating layer body (2111) and a reinforcing portion (2112) arranged thereon, wherein the first insulating layer body (2111) is a flat plate structure; and / or The second insulating layer (212) is a flat plate structure.

3. The top cover assembly according to claim 2, wherein: The thickness of the first insulating layer (211) is greater than or equal to 0.5 mm and less than or equal to 2 mm; and / or The thickness of the second insulating layer (212) is greater than or equal to 0.5 mm and less than or equal to 2 mm.

4. The top cover assembly according to claim 2, wherein: A liquid leakage hole (21112) is provided on the first insulating layer body (2111), and the liquid leakage hole (21112) is located between the cover plate (10) and the electrode group (200).

5. The top cover assembly according to claim 1, wherein: The second partition (22) is provided with a receiving groove (221), and the connecting member (40) is provided in the receiving groove (221).

6. The top cover assembly according to claim 1, wherein: A pole lug accommodating area (21111) is provided on a side of the first partition (21) facing away from the cover plate (10); the pole group (200) includes pole lugs (210), and at least a portion of the pole lugs (210) is accommodated in the pole lug accommodating area (21111).

7. The top cover assembly according to claim 1, wherein: The first insulating member (20) is provided with a pole lug hole (23); the pole group (200) includes a pole lug (210); one end of the pole lug (210) is connected to the pole group (200); the other end of the pole lug (210) is connected to the connecting member (40); and at least a portion of the pole lug (210) is accommodated in the pole lug hole (23).

8. The top cover assembly according to any one of claims 1 to 7, characterized in that: The top cover assembly further comprises: The explosion-proof mechanism (30) is arranged on the cover plate (10); a vent hole (213) is provided on the first insulating member (20); and the vent hole (213) is directly opposite to the explosion-proof mechanism (30).

9. The top cover assembly according to any one of claims 1 to 7, characterized in that: The first partition (21) and the second partition (22) are integrally formed or have a split structure.

10. A battery comprising a housing (300) and an electrode group (200), characterized in that: It also includes a top cover assembly according to any one of claims 1 to 9, the pole group (200) is arranged in the shell (300), and the top cover assembly is covered on the shell (300).

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