Top cover assembly and battery

Abstract

The utility model provides a top cover assembly and a battery, and relates to the technical field of energy storage. The top cover assembly provided by the utility model comprises a substrate which is provided with a mounting hole; the electrode terminal is sleeved with the fixing sleeve, the fixing sleeve is fixedly connected with the substrate, the electrode terminal comprises a main body part and an extension part which are connected, at least part of the fixing sleeve wraps the extension part, and the main body part is connected to the mounting hole in a sealed mode; the switching piece is fixedly connected to the main body part through the inserting structure, and at least part of the switching piece is located in the mounting hole. The top cover assembly provided by the utility model is used for sealing the battery shell, the sealing performance is excellent, and the connection stability of the electrode terminal and the adapter plate in the top cover assembly is relatively high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a top cover assembly and a battery. BACKGROUND

[0002] Lithium batteries are widely used in electric vehicles, energy storage systems, consumer electronics and other fields. A lithium battery includes a battery shell, a battery cell arranged in the shell, and a top cover assembly for sealing the battery shell. The top cover assembly provides electrical connection and mechanical protection for the battery, and ensures the sealing performance, safety protection, insulation performance and environmental adaptability of the battery.

[0003] However, a large amount of gas is often generated in the battery due to electrochemical reaction and temperature rise of the working environment, which causes the internal pressure of the battery shell to rise sharply, resulting in the sealing failure of the top cover assembly to the battery shell. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a top cover assembly and a battery. The top cover assembly is used for sealing the battery shell, and has excellent sealing performance and high connection stability between the electrode terminal and the adapter piece in the top cover assembly.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] The first aspect of the present application provides a top cover assembly for sealing a battery shell, which comprises:

[0007] a base plate having a mounting hole;

[0008] an electrode terminal and a fixing sleeve sleeved on the electrode terminal, the fixing sleeve being fixedly connected with the base plate, the electrode terminal comprising a main body portion and an extension portion connected with each other, at least part of the fixing sleeve being covered on the extension portion, and the main body portion being sealingly connected with the mounting hole;

[0009] an adapter piece and a plug-in structure, the adapter piece being fixedly connected with the main body portion through the plug-in structure, and at least part of the adapter piece being located in the mounting hole.

[0010] In a possible implementation, a support member is further included, and the adapter piece is connected with the base plate through the support member.

[0011] In a possible implementation, a sealing member is further included, and the sealing member is sealingly connected between the mounting hole and the main body portion of the electrode terminal.

[0012] Alternatively, the fixing sleeve has an extension portion, the extension portion extending into the mounting hole and being used for radially supporting the main body portion of the electrode terminal along the mounting hole.

[0013] In a possible implementation, the plug-in structure comprises a first plug-in part and a second plug-in part, the first plug-in part is arranged on the main body part, and the second plug-in part is arranged on the adapter piece, and the adapter piece is fixed by plugging the second plug-in part and the first plug-in part.

[0014] In a possible implementation, the first plug-in part is a protruding part connected to the main body part, and the second plug-in part is a socket arranged on the adapter piece, and the protruding part is fixed in the socket by plugging.

[0015] Alternatively, the first plug-in part is a groove arranged on the main body part, and the second plug-in part is a protruding block connected to the adapter piece, and the protruding block is fixed in the groove by plugging.

[0016] In a possible implementation, the protruding part is welded to the socket.

[0017] In a possible implementation, a side surface of the main body part of the electrode terminal, away from the protruding part, is provided with a welding positioning groove.

[0018] In a possible implementation, the main body part and the extension part of the electrode terminal are both composite structures in which an aluminum layer and a copper layer are stacked and connected, the copper layer is located on a side of the aluminum layer facing the substrate, and the copper layer is provided with the first plug-in part.

[0019] In a possible implementation, an insulating piece is further included, the insulating piece is provided with a clamping groove, the adapter piece is provided with a flange, and the adapter piece is clamped to the clamping groove through the flange.

[0020] The top cover assembly provided in the first aspect of the application has at least the following beneficial effects:

[0021] The electrode terminal in the top cover assembly is sealingly connected to the mounting hole of the substrate, thereby ensuring the sealing performance of the top cover assembly after being arranged on the battery shell, and the extension part arranged on the electrode terminal cooperates with the fixing sleeve to be fixed to the substrate, thereby increasing the contact area of the electrode terminal and the fixing sleeve to improve the connection strength of the electrode terminal and the substrate, and the plug-in structure arranged between the main body part of the electrode terminal and the adapter piece strengthens the connection stability therebetween.

[0022] The second aspect of the application provides a battery, comprising:

[0023] A battery shell having a containing cavity, the containing cavity having an opening;

[0024] An electric core arranged in the containing cavity;

[0025] The top cover assembly provided in any of the first aspect has the advantage of covering the opening and sealing the accommodating cavity.

[0026] The battery provided in the second aspect has all the advantages of the top cover assembly provided in the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 The overall structure schematic diagram of the top cover assembly provided in the embodiments of the present application;

[0029] Figure 2 The top view structure schematic diagram of the top cover assembly provided in the embodiments of the present application;

[0030] Figure 3 The front view of the top cover assembly provided in the embodiments of the present application;

[0031] Figure 4 The sectional view of Figure 3

[0032] Figure 5 The enlarged structure schematic diagram of the A area in Figure 4

[0033] Figure 6 The structure schematic diagram in which the sealing part is replaced by the extension part of the fixing part. Figure 5

[0034] Legend of the drawings:

[0035] 100, substrate;

[0036] 110, mounting hole; 120, liquid injection hole;

[0037] 200, electrode terminal;

[0038] 210, main body part; 211, welding positioning groove;

[0039] 220, extension part;

[0040] 300, fixing sleeve;

[0041] 310, extension part;

[0042] 400, plug-in structure; ​​​

[0043] 410, first plug-in part; 420, second plug-in part;

[0044] 500, adapter piece;

[0045] 600, support;

[0046] 700, sealing member;

[0047] 800, insulating member;

[0048] 900, explosion-proof member.

[0049] The specific embodiments of the present application have been shown through the above drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the present application concept in any way, but to illustrate the present application concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0050] As described in the background, lithium batteries have a wide range of applications in electric vehicles, energy storage systems, consumer electronics and other fields. The lithium battery includes a battery shell, an electric core arranged in the shell, and a top cover assembly for sealing the battery shell. The top cover assembly provides electrical connection and mechanical protection for the battery, and ensures the sealing performance, safety protection, insulation performance and environmental adaptability of the battery.

[0051] However, the battery is often prone to produce a large amount of gas due to electrochemical reaction and temperature rise of the working environment, which causes the internal pressure of the battery shell to rise sharply, resulting in the sealing failure of the top cover assembly to the battery shell.

[0052] To solve the above technical problems, the present application provides a top cover assembly. The electrode terminal in the top cover assembly is sealingly connected to the mounting hole of the substrate, which ensures the sealing performance of the top cover assembly after being arranged on the battery shell. In addition, the extension part arranged on the electrode terminal cooperates with the fixing sleeve, and the fixing sleeve is fixed to the substrate, thereby increasing the contact area of the electrode terminal and the fixing sleeve to improve the connection strength of the electrode terminal and the substrate. At the same time, the plug-in structure arranged between the electrode terminal main body and the adapter piece strengthens the connection stability between the two.

[0053] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0054] In conjunction withFigures 1 to 6 The top cover assembly provided by the embodiment of the present application is used for covering a battery shell, and the top cover assembly comprises a base plate 100 having a mounting hole 110, an electrode terminal 200 and a fixing sleeve 300 sleeved on the electrode terminal 200, the fixing sleeve 300 is fixedly connected with the base plate 100, the electrode terminal 200 comprises a main body part 210 and an extension part 220 connected with each other, at least part of the fixing sleeve 300 is wrapped on the extension part 220, and the main body part 210 is sealingly connected to the mounting hole 110; a plug-in structure 400 and a connecting sheet 500, the connecting sheet 500 is fixedly connected to the main body part 210 through the plug-in structure 400, and at least part of the connecting sheet 500 is located in the mounting hole 110.

[0055] In this way, the electrode terminal 200 in the top cover assembly is sealingly connected to the mounting hole 110 of the base plate 100, so that the sealing performance of the top cover assembly after being covered on the battery shell is ensured, and the extension part 220 provided on the electrode terminal 200 cooperates with the fixing sleeve 300, the fixing sleeve 300 is fixed to the base plate 100, the contact area of the electrode terminal 200 and the fixing sleeve 300 is increased to improve the connection strength of the electrode terminal 200 and the base plate 100, and the plug-in structure 400 provided between the main body part 210 of the electrode terminal 200 and the connecting sheet 500 strengthens the connection stability between the two.

[0056] It should be noted that two mounting holes 110 are provided on the base plate 100 at intervals, and are respectively used for mounting a positive electrode terminal and a negative electrode terminal, the negative electrode terminal is taken as an example for description in combination with the drawings, and the sealing structure and the plug-in structure 400 on the positive electrode terminal are the same as those on the negative electrode terminal.

[0057] In some embodiments, the plug-in structure 400 comprises a first plug-in part 410 and a second plug-in part 420, the first plug-in part 410 is provided on the main body part 210, the second plug-in part 420 is provided on the connecting sheet 500, and the connecting sheet 500 is fixedly plugged through the second plug-in part 420 and the first plug-in part 410, so that, compared with the direct planar butt joint of the main body part 210 of the electrode terminal 200 and the connecting sheet 500, the cooperation and fixation of the two plug-in parts increase the contact area of the electrode terminal 200 and the connecting sheet 500, which is beneficial to the improvement of the connection strength of the two, and the compactness of the whole top cover assembly is improved.

[0058] In some embodiments, the first plug-in part 410 is a protruding part, the protruding part is connected to the main body part 210, the second plug-in part 420 is a plug hole provided on the connecting sheet 500, and the protruding part is fixedly plugged in the plug hole, and further, the plug hole is a through hole.

[0059] In some other embodiments, the first plug-in part 410 is a groove, the groove is provided on the main body part 210, the second plug-in part 420 is a protruding block, the protruding block is connected to the connecting sheet 500, and the protruding block is fixedly plugged in the groove.

[0060] In this way, by virtue of the different structural designs of the electrode terminal 200 and the adapter plate 500, the plug-in structure 400 can be selected according to different processing requirements, thereby improving the application flexibility of the plug-in structure 400.

[0061] In some embodiments, the protrusion is welded to the socket. For example, the protrusion and the socket are connected by laser welding, or the protrusion and the socket are connected by spot welding, or the protrusion and the socket are connected by argon arc welding. In this way, the combination of the plug-in structure 400 and the welding structure further strengthens the connection stability of the electrode terminal 200 and the adapter plate 500.

[0062] In some embodiments, the side surface of the main body 210 of the electrode terminal 200 away from the protrusion is provided with a welding positioning groove 211. Specifically, the welding positioning groove 211 is a sunken groove. In this way, the positioning groove provides a clear physical reference point, ensuring that the welding equipment (such as a laser welding machine or an ultrasonic welding machine) can accurately align the welding position. Through these grooves, the deviation of the welding position can be avoided, the welding precision is improved, that is, the adapter plate and the main body 210 can be prevented from being misaligned during the welding process, and the alignment of the welding point and the welding quality are ensured.

[0063] In some embodiments, the top cover assembly further comprises a support 600. The adapter plate 500 is sealingly connected to the mounting hole 110 through the support 600. For example, the support 600 is a rubber sealing ring. The side of the main body 210 of the electrode terminal 200 facing the adapter plate 500 has an annular flange. The rubber sealing ring is sleeved on the annular flange and abuts against the inner wall and the upper surface of the mounting hole 110 of the substrate 100.

[0064] The sealing area formed by the adapter plate 500, the substrate 100 and the support 600 can effectively prevent the electrolyte in the battery shell from entering the electrode terminal 200 and causing electrical damage.

[0065] In other examples, the support 600 can be provided with an opening. The support 600 can be provided only as a support structure between the adapter plate 500 and the substrate 100, rather than a sealing structure. Further, the support 600 is made of an insulating material.

[0066] In some embodiments, the top cover assembly further comprises a sealing member 700. The sealing member 700 is sealingly connected between the mounting hole 110 and the main body 210 of the electrode terminal 200. The sealing member 700 is an elastic member that abuts against the upper surface and the bottom wall of the adapter plate 500 and the substrate 100. For example, the sealing member 700 is a metal-rubber composite sealing ring. The sealing member 700 has excellent sealing performance and good high-temperature and high-pressure resistance.

[0067] In some embodiments, the fixing sleeve 300 has an extension 310 extending into the mounting hole 110 for radially supporting the main body 210 of the electrode terminal 200. For example, the fixing sleeve 300 is a plastic sleeve injection molded on the surface of the electrode terminal 200. In this way, by designing the shape of the fixing sleeve 300, a part of the structure of the fixing sleeve 300 fills the gap between the main body 210 of the electrode terminal 200 and the inner wall of the mounting hole 110 of the substrate 100, thereby serving as a support connector to ensure the stability of the installation of the electrode terminal 200 on the mounting hole 110.

[0068] In this way, the sealing effect of the plug-in structure 400 and the welding structure between the electrode terminal 200 and the adapter sheet 500 is achieved, and a sealing reinforcing design of a sealing member is provided outside. If there is a poor welding, such as a blowhole, in the welding area, the sealing area between the main body 210 of the electrode terminal 200 and the mounting hole 110 can still achieve terminal sealing, which can prevent the electrolyte from leaking out of the battery case.

[0069] In some embodiments, an insulating member 800 is further provided, which is provided with a clamping groove, and the adapter sheet 500 is provided with a flange, and the adapter sheet is clamped in the clamping groove by the flange. For example, the insulating member 800 is provided with a first connecting hole, and the substrate 100 is provided with a second connecting hole corresponding to the first connecting hole, and the insulating member 800 is fixed to the substrate 100 by a threaded connecting member; or the insulating member 800 is welded to the side of the substrate 100 away from the fixing member. In this way, it is ensured that the adapter sheet will not loosen or shift during use, and the insulating member 800 can improve the mechanical strength of the entire cover plate assembly to prevent the adapter sheet from falling off or deforming under external conditions such as vibration or impact.

[0070] Further, the support member 600 can be made of a heat-insulating material, such as heat-insulating ceramic material, which can have a heat-insulating temperature of above 160℃, thereby improving the heat-insulating performance of the top cover assembly from the aspects of material and structure.

[0071] In more embodiments, the main body and the extension of the electrode terminal are both composite structures in which an aluminum layer and a copper layer are stacked and connected, and the copper layer is located on the side of the aluminum layer facing the substrate, and the copper layer is provided with the first plug-in part. In this way, by designing the copper-aluminum composite structure, the material cost can be reduced while maintaining good electrical conductivity, and the structure can be lightened while the copper-aluminum composite structure has good toughness, thereby enhancing the durability and reliability of the electrode terminal during use.

[0072] In some embodiments, the substrate 100 is provided with a liquid injection hole 120 for introducing electrolyte, so as to ensure accurate addition of electrolyte, exclude air, balance pressure, and effectively seal after liquid injection.

[0073] In some embodiments, the cover plate assembly further comprises an explosion-proof device, the base plate 100 is provided with an explosion-proof hole, and the explosion-proof device is installed in the explosion-proof hole. For example, the explosion-proof device is an explosion-proof valve. When excessive gas is generated inside the battery due to an electrochemical reaction, temperature rise or other reasons, the internal pressure gradually increases. The explosion-proof valve automatically opens when the pressure reaches a preset threshold, releasing the excess gas inside, preventing the pressure from continuing to rise, thereby avoiding battery explosion. By timely releasing the pressure inside the battery shell, the explosion-proof valve can protect the structural integrity of the battery and prevent the battery shell from breaking or deforming.

[0074] Another aspect of the embodiments of the present application also provides a battery, comprising: a battery shell having a receiving cavity, the receiving cavity having an opening; an electric core arranged in the receiving cavity; and the top cover assembly provided by any one of the embodiments of the first aspect, the top cover assembly covering the opening to seal the receiving cavity.

[0075] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0076] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0077] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0078] In the present application, unless specifically stated and limited otherwise, a first feature "on" or "under" a second feature can be directly contacting the first and second features, or indirectly contacting the first and second features through an intermediate medium. Also, a first feature "over", "above" and "on top of" a second feature can be directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. A first feature "under", "below" and "underneath" a second feature can be directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0079] The embodiments or implementations in the present specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between the embodiments can be mutually referred to.

[0080] It should be noted that the embodiments referred to in the specification as "one embodiment", "an embodiment", "example embodiment", "some embodiments" and the like can include specific features, structures or characteristics, but not necessarily every embodiment includes the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a specific feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure or characteristic in connection with other embodiments, whether explicitly described or not.

[0081] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and such modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cap assembly, characterized by, A top cover assembly for sealing a battery housing, the top cover assembly comprising: a base plate having a mounting hole; an electrode terminal and a fixing sleeve sleeved on the electrode terminal, the fixing sleeve being fixedly connected with the base plate, the electrode terminal comprising a main body portion and an extension portion connected with each other, at least part of the fixing sleeve being covered on the extension portion, the main body portion being sealingly connected with the mounting hole; a plug-in structure and a conversion sheet, the conversion sheet being fixedly connected with the main body portion through the plug-in structure, and at least part of the conversion sheet being located in the mounting hole.

2. The roof assembly of claim 1, wherein, Further comprising a support, the conversion sheet being connected with the base plate through the support.

3. The roof assembly of claim 1, wherein, Further comprising a sealing member, the sealing member being sealingly connected between the mounting hole and the main body portion of the electrode terminal; Alternatively, the fixing sleeve has an extension portion, the extension portion extending into the mounting hole for radially supporting the main body portion of the electrode terminal along the mounting hole.

4. The roof assembly of any of claims 1-3, wherein, The plug-in structure comprises a first plug-in portion and a second plug-in portion, the first plug-in portion being arranged on the main body portion, and the second plug-in portion being arranged on the conversion sheet, the conversion sheet being fixedly plugged in through the second plug-in portion and the first plug-in portion.

5. The roof assembly of claim 4, wherein, The first plug-in portion is a protruding portion, the protruding portion being connected with the main body portion, and the second plug-in portion is a plug hole arranged on the conversion sheet, the protruding portion being fixedly plugged in the plug hole; Alternatively, the first plug-in portion is a groove arranged on the main body portion, and the second plug-in portion is a protruding block connected with the conversion sheet, the protruding block being fixedly plugged in the groove.

6. The roof assembly of claim 5, wherein, The protruding portion is welded on the plug hole.

7. The roof assembly of claim 6, wherein, A welding positioning groove is arranged on a side surface of the main body portion of the electrode terminal, which is away from the protruding portion.

8. The roof assembly of claim 4, wherein, The main body portion and the extension portion of the electrode terminal are both composite structures in which an aluminum layer and a copper layer are laminated and connected with each other, the copper layer being arranged on a side of the aluminum layer which is towards the base plate, and the copper layer being provided with the first plug-in portion.

9. The roof assembly of any of claims 1-3, wherein, Further comprising an insulating member provided with a clamping groove, the conversion sheet being provided with a flange, and the conversion sheet being clamped in the clamping groove through the flange.

10. A battery, characterized by A battery housing having a receiving cavity with an opening; an electrode terminal and a fixing sleeve sleeved on the electrode terminal, the fixing sleeve being fixedly connected with the base plate, the electrode terminal comprising a main body portion and an extension portion connected with each other, at least part of the fixing sleeve being covered on the extension portion, the main body portion being sealingly connected with the mounting hole; a plug-in structure and a conversion sheet, the conversion sheet being fixedly connected with the main body portion through the plug-in structure, and at least part of the conversion sheet being located in the mounting hole. Further comprising a support, the conversion sheet being connected with the base plate through the support. Further comprising a sealing member, the sealing member being sealingly connected between the mounting hole and the main body portion of the electrode terminal; Alternatively, the fixing sleeve has an extension portion, the extension portion extending into the mounting hole for radially supporting the main body portion of the electrode terminal along the mounting hole. The plug-in structure comprises a first plug-in portion and a second plug-in portion, the first plug-in portion being arranged on the main body portion, and the second plug-in portion being arranged on the conversion sheet, the conversion sheet being fixedly plugged in through the second plug-in portion and the first plug-in portion. The first plug-in portion is a protruding portion, the protruding portion being connected with the main body portion, and the second plug-in portion is a plug hole arranged on the conversion sheet, the protruding portion being fixedly plugged in the plug hole; Alternatively, the first plug-in portion is a groove arranged on the main body portion, and the second plug-in portion is a protruding block connected with the conversion sheet, the protruding block being fixedly plugged in the groove. The protruding portion is welded on the plug hole. A welding positioning groove is arranged on a side surface of the main body portion of the electrode terminal, which is away from the protruding portion. The main body portion and the extension portion of the electrode terminal are both composite structures in which an aluminum layer and a copper layer are laminated and connected with each other, the copper layer being arranged on a side of the aluminum layer which is towards the base plate, and the copper layer being provided with the first plug-in portion. Further comprising an insulating member provided with a clamping groove, the conversion sheet being provided with a flange, and the conversion sheet being clamped in the clamping groove through the flange.

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