Top cover assembly and battery

Abstract

The utility model provides a top cover assembly and a battery. The top cover assembly provided by the utility model comprises a top cover sheet, a pole, a separator and a liquid separation ring, the top cover sheet covers the opening of the battery shell and is enclosed with the shell to form an accommodating space; and the pole penetrates through the top cover plate. The separator is arranged between the pole and the top cover plate so as to separate the pole from the top cover plate. The liquid separation ring is arranged on one side, opposite to the accommodating space, of the top cover sheet and surrounds the pole; the liquid isolation ring protrudes out of the surface of the top cover piece in the direction away from the containing space and is inserted into the isolation piece. The depth of the liquid separation ring inserted into the separator is 0.1 mm to 4 mm. According to the top cover assembly, the liquid separation ring is arranged, and the liquid separation ring protrudes out of the surface of the top cover piece in the direction away from the containing space, so that the electrolyte separation effect of the top cover assembly is better.

Description

Technical Field

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

[0002] The electrolyte needs to be injected into the battery, and this step is usually performed in the later stage of battery assembly. At this time, the pole and other structures have been assembled on the battery shell. During the injection process, the electrolyte often overflows the battery to ensure sufficient injection. The electrolyte that overflows the battery will flow along the battery shell. Because the electrolyte chemical properties are relatively active and often even have a certain degree of corrosiveness; therefore, it often happens that the electrolyte penetrates through the gap between the separator and the top cover piece and contacts the pole, causing the pole to short-circuit and damage the battery. In order to avoid damage to the battery during the manufacturing process and improve the battery yield, a top cover assembly with better electrolyte isolation is needed. Utility Model Content

[0003] The embodiments of the present application provide a top cover assembly and a battery to solve the problem that the existing top cover assembly has a poor effect of isolating electrolyte.

[0004] In a first aspect, an embodiment of the present application provides a top cover assembly, which is applied to a battery, wherein the battery comprises a housing, wherein the housing is provided with an opening, and the top cover assembly comprises:

[0005] A top cover sheet, covering the opening and enclosing with the outer shell to form a containing space;

[0006] A pole, passing through the top cover sheet;

[0007] An isolating member, disposed between the pole and the top cover sheet, to isolate the pole and the top cover sheet;

[0008] A liquid isolating ring is arranged on the side of the top cover sheet facing away from the accommodating space and is arranged around the pole; the liquid isolating ring protrudes from the surface of the top cover sheet in a direction away from the accommodating space and is inserted into the isolating member; the depth of the liquid isolating ring inserted into the isolating member is between 0.1 mm and 4 mm.

[0009] In some embodiments, the top cover sheet and the liquid spacer ring are integrally formed.

[0010] In some embodiments, an annular groove is provided on the isolating member; the liquid isolating ring is inserted into the annular groove along the axial direction of the pole and has an interference fit with the annular groove.

[0011] In some embodiments, the liquid isolation ring includes a ring portion and a connecting portion; the ring portion surrounds the pole and protrudes from the surface of the top cover sheet; the connecting portion is arranged on one end of the ring portion close to the top cover sheet; and the connecting portion is fixedly connected to the top cover sheet.

[0012] In some embodiments, the liquid isolation ring and the isolating member are integrally formed; and the connecting portion protrudes from the isolating member along the radial direction of the pole.

[0013] In some embodiments, the thickness of the liquid spacer ring is between 0.2 mm and 1.0 mm.

[0014] In some embodiments, there are a plurality of the liquid isolating rings, and the plurality of the liquid isolating rings are spaced apart in the radial direction of the pole.

[0015] In some embodiments, the top cover assembly further includes a sealing ring; the sealing ring is disposed between the pole and the top cover sheet, and isolates the pole and the top cover sheet.

[0016] In some embodiments, the isolation member includes a first part and a second part; the first part is arranged on a side of the top cover sheet facing away from the accommodating space, and isolates the pole and the top cover sheet in the surface normal direction of the top cover sheet; the second part is arranged along the axial direction of the pole and between the pole and the top cover sheet; the second part abuts against the sealing ring at one end facing the accommodating space.

[0017] In some embodiments, the pole includes a column and a flange; the column is penetrated through the top cover sheet; the flange is connected to one end of the column close to the accommodating space, and protrudes away from the column along the radial direction of the column; along the axial direction of the column, the flange is arranged on the side of the top cover sheet facing the accommodating space, and the sealing ring is arranged between the flange and the top cover sheet.

[0018] In a second aspect, an embodiment of the present application further provides a battery, comprising a housing and a top cover assembly as described in any one of the above items, wherein the top cover assembly is connected to the housing.

[0019] The top cover assembly provided in the embodiment of the present application is provided with a liquid isolating ring, so that the top cover assembly has a better effect of isolating the electrolyte. The liquid isolating ring is inserted into the isolating member; in this way, it can cooperate with the isolating member to block the electrolyte together. The depth of the liquid isolating ring inserted into the isolating member is between 0.1 mm and 4 mm, so that it has a better effect of blocking the electrolyte and is easy to assemble. Specifically, the liquid isolating ring protrudes from the surface of the top cover sheet, and the liquid isolating ring is arranged around the pole. When the electrolyte flows along the surface of the top cover sheet to the pole, the liquid isolating ring can block the electrolyte, thereby preventing the electrolyte from contacting the pole. In the actual production process, in order to avoid wasting electrolyte, even if the electrolyte is allowed to seep out in order to fill the inside of the battery, only a small amount of seepage is allowed, so the liquid isolating ring is sufficient to resist the electrolyte. This improves the effect of the top cover assembly in isolating the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[0021] In order to more completely understand the present application and its beneficial effects, the following description will be made in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts;

[0022] Figure 1 A schematic diagram of a cross-sectional structure of a first embodiment of a top cover assembly provided in an embodiment of the present application;

[0023] Figure 2 for Figure 1 The structural diagram of part A in the figure;

[0024] Figure 3 A schematic cross-sectional view of a second embodiment of a top cover assembly provided in an embodiment of the present application;

[0025] Figure 4 for Figure 3 The structural diagram of part B;

[0026] Figure 5 A schematic diagram of the battery structure provided in an embodiment of the present application.

[0027] Description of Figure Numbers:

[0028] Label name Label name 10 shell 41 Ring groove 11 Opening 42 Part I 12 Accommodation space 43 Part 2 20 Top cover 50 Liquid separator ring 30 Pole 51 Ring 31 Column 52 Connection 32 Convex edge 60 Sealing ring 40 Isolation 100 Top cover assembly DETAILED DESCRIPTION

[0029] 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, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0030] The embodiment of the present application provides a top cover assembly and a battery to solve the problem that the existing top cover assembly has a poor isolation effect on the electrolyte. The following will be described in conjunction with the accompanying drawings.

[0031] In order to more clearly illustrate the structure of the top cover assembly, the top cover assembly will be introduced below with reference to the accompanying drawings.

[0032] First, refer to Figure 1 An embodiment of the present application provides a top cover assembly, the top cover assembly 100 includes a top cover sheet 20, a pole 30, an isolating member 40 and a liquid isolating ring 50.

[0033] Combination Figure 5 The top cover assembly 100 is mainly used in a battery. The battery includes a shell 10 , and an opening 11 is provided on the shell 10 . The top cover assembly 100 covers the opening 11 of the shell 10 of the battery.

[0034] Specifically, the top cover sheet 20 of the top cover assembly 100 covers the opening 11 of the battery housing 10 and encloses the housing 10 to form a receiving space 12. The receiving space 12 is usually used to install the pole piece and inject the electrolyte. The pole 30 is penetrated through the top cover sheet 20, and as one pole of the battery, connects the external electrical appliance with the pole plate or other discharge material in the receiving space 12 to realize the charging and / or discharging of the battery.

[0035] The isolating member 40 is disposed between the pole 30 and the top cover sheet 20 to isolate the pole 30 from the top cover sheet 20. The isolating member 40 needs to be disposed between the pole 30 and the top cover sheet 20 because both the top cover sheet 20 and the pole 30 may be made of conductive materials, such as various metals or alloys. The isolating member 40 can prevent the current on the pole 30 from being introduced into the top cover sheet 20, causing leakage or battery short circuit, thereby protecting the battery. Regardless of whether the top cover sheet 20 is a conductor or a non-conductor, the isolating member 40 can play a certain sealing role. On the one hand, it prevents the electrolyte in the accommodating space 12 from flowing out of the battery from the matching gap between the pole 30 and the top cover sheet 20. On the other hand, it prevents the electrolyte flowing out when the electrolyte is filled into the accommodating space 12 from contacting the pole 30.

[0036] The liquid isolating ring 50 is arranged on the side of the top cover sheet 20 facing away from the accommodating space 12, and is arranged around the pole 30, so that when the electrolyte flows radially inward toward the pole 30, it must first pass through the liquid isolating ring 50. The liquid isolating ring 50 protrudes from the surface of the top cover sheet 20 in the direction away from the accommodating space 12, so that before the electrolyte flows to the radial inner side of the liquid isolating ring 50 (i.e., the side close to the pole 30), it must first climb over the liquid isolating ring 50, so that the liquid isolating ring 50 can block the electrolyte. The liquid isolating ring 50 is also inserted into the isolating member 40; in this way, it can cooperate with the isolating member 40 to block the electrolyte together.

[0037] The depth of the liquid-isolating ring 50 inserted into the isolating member 40 is between 0.1 mm and 4 mm. When the depth of the liquid-isolating ring 50 inserted into the isolating member 40 is less than 0.1 mm, the effect of the liquid-isolating ring 50 in blocking the electrolyte may be poor. Even if the overflowed electrolyte is small, it is easy to turn over the liquid-isolating ring 50 and contact the pole 30. When the depth of the liquid-isolating ring 50 inserted into the isolating member 40 is greater than 4 mm, the liquid-isolating ring 50 is easy to deform during the assembly process, resulting in assembly failure, or the liquid-isolating ring 50 protrudes further from the top cover sheet 20 in the axial direction of the pole 30, resulting in interference from the liquid-isolating ring 50 (or the isolating member 40) when the pole 30 is electrically connected to the electrical appliance. When the depth of the liquid spacer ring 50 inserted into the isolation member 40 is between 0.1 mm and 4 mm, the above problem can be overcome, wherein the depth of the liquid spacer ring 50 inserted into the isolation member 40 can specifically be 0.1 mm, 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, or 4.0 mm.

[0038] refer to Figure 3 and Figure 4 In some embodiments, the top cover sheet 20 and the liquid isolating ring 50 are integrally formed. When the top cover sheet 20 is made of metal, such as aluminum or aluminum alloy, the liquid isolating ring 50 can be stamped out on the top cover sheet 20 by stamping (or extruding) the top cover sheet 20. Figure 4 As shown, the liquid-isolating ring 50 and the top cover sheet 20 can be integrally formed, specifically by casting, extrusion or composite molding. In some embodiments, the top cover sheet 20 and the liquid-isolating ring 50 are integrally cast. Integral molding can make the assembly of the top cover assembly simpler, that is, the assembly steps of the liquid-isolating ring 50 and the top cover sheet 20 can be omitted. Integral molding can also avoid the generation of a matching gap between the liquid-isolating ring 50 and the top cover sheet 20, further improving the effect of isolating the electrolyte and better avoiding the electrolyte from contacting the pole 30.

[0039] refer to Figure 1 and Figure 2 In some embodiments, an annular groove 41 is provided on the isolating member 40. The liquid isolating ring 50 is inserted into the annular groove 41 along the axial direction of the pole 30 and is interference-fitted with the annular groove 41. The interference fit makes the fit between the liquid isolating ring 50 and the isolating member 40 free of gap or extremely small, and the electrolyte is not easy to penetrate, thereby improving the sealing effect. The interference fit also makes the liquid isolating ring 50 limit or support the isolating member 40, making the isolating member 40 more firmly assembled.

[0040] refer to Figure 2In some embodiments, the liquid isolating ring 50 includes a ring portion 51 and a connecting portion 52. The ring portion 51 surrounds the pole 30 and protrudes from the surface of the top cover sheet 20, which can play a role in isolating the electrolyte. The connecting portion 52 is arranged at one end of the ring portion 51 close to the top cover sheet 20, and the connecting portion 52 is fixedly connected to the top cover sheet 20. In some embodiments, the liquid isolating ring 50 can be a sheet structure with a small thickness, such as Figure 2 The structure shown in the middle ring portion 51 is such that when the liquid-isolating ring 50 is connected to the top cover sheet 20, only one side of the liquid-isolating ring 50 is connected to the top cover sheet 20, and the setting of the connecting portion 52 increases the connection area between the liquid-isolating ring 50 and the top cover sheet 20, making the connection between the liquid-isolating ring 50 and the top cover sheet 20 easier and more secure. For example, when the connecting portion 52 and the top cover sheet 20 are both made of metal, the two can be bonded together by a metal adhesive, or the two can be fixedly connected by welding. Regardless of bonding or welding, the setting of the connecting portion 52 can make the combination of the two more reliable and simple.

[0041] refer to Figure 2 In some embodiments, the liquid-isolating ring 50 is integrally formed with the isolating member 40. The connecting portion 52 protrudes from the isolating member 40 along the radial direction of the pole 30. In order to isolate the pole 30 and the top cover sheet 20, the isolating member 40 is often made of insulating material. In fact, the isolating member 40 often also plays a sealing role, that is, to prevent the electrolyte from flowing out of the accommodating space 12 through the matching gap between the pole 30 and the top cover sheet 20 in the accommodating space 12, so the isolating member 40 is usually made of plastic. The liquid-isolating ring 50 is convenient for connection with the top cover sheet 20, and is often made of metal material. In this way, the liquid-isolating ring 50 and the isolating member 40 can be integrally formed through the insert injection molding process, which avoids the matching gap between the isolating member 40 and the liquid-isolating ring 50, improves the sealing, and makes it difficult for the electrolyte leaked during the electrolyte injection to flow from the matching gap between the isolating member 40 and the liquid-isolating ring 50 to the pole 30, causing the battery to short-circuit. When the liquid isolation ring 50 and the top cover plate 20 are connected by welding, since the connecting portion 52 protrudes from the isolating member 40 in the radial direction of the pole 30, the portion of the connecting portion 52 protruding from the isolating member 40 can be welded to the top cover plate 20, so that the high heat generated during welding will not melt the isolating member 40.

[0042] refer to Figure 2 In some embodiments, the thickness of the liquid spacer ring 50 is between 0.2 mm and 1.0 mm. The thickness of the liquid spacer ring 50 refers to the thickness of the liquid spacer ring 50 itself. Figure 2 In the embodiment shown, the liquid spacer ring 50 is actually formed by stamping a metal sheet, and the thickness of the liquid spacer ring 50 refers to the thickness of the metal sheet. Of course, the liquid spacer ring 50 can also be manufactured using other processes. Figure 2In the illustrated embodiment, the thickness of the liquid spacer ring 50 refers to the thickness of the ring portion 51 in the radial direction of the pole 30, or the thickness of the connecting portion 52 in the normal direction of the surface of the top cover sheet 20. When the thickness of the liquid spacer ring 50 is less than 0.2 mm, the liquid spacer ring 50 is relatively weak and may be squeezed and deformed by the isolating member 40 and other components during the assembly process and damaged. In addition, if the liquid spacer ring 50 is manufactured by a stamping process, the thickness of the liquid spacer ring 50 is less than 0.2 mm, which may also cause the liquid spacer ring 50 to be difficult to form. When the thickness of the liquid spacer ring 50 is greater than 1 mm, since the liquid spacer ring 50 will be inserted into the isolating member 40, it will occupy the setting space of the isolating member 40, which may require a larger volume for the isolating member 40 to accommodate the liquid spacer ring 50, thereby increasing the volume of the battery. In addition, when the liquid spacer ring 50 is manufactured by a stamping process, the thickness of the liquid spacer ring 50 is greater than 1 mm, which may also cause it to be difficult to form. When the thickness of the liquid spacer ring 50 is between 0.2 mm and 1.0 mm, the above problem can be overcome, wherein the depth of the liquid spacer ring 50 inserted into the isolation member 40 can specifically be 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, or 1.0 mm.

[0043] refer to Figure 1 In some embodiments, there are multiple liquid isolating rings 50, and the multiple liquid isolating rings 50 are spaced apart in the radial direction of the pole 30. In this way, the electrolyte needs to go over multiple liquid isolating rings 50 before contacting the pole 30, which further improves the effect of isolating the electrolyte.

[0044] refer to Figure 2 In some embodiments, the top cover assembly further includes a sealing ring 60; the sealing ring 60 is disposed between the pole 30 and the top cover sheet 20, and is used to isolate the pole 30 from the top cover sheet 20. In some specific embodiments, during assembly, the sealing ring can be sleeved on the pole 30 and fit tightly with the surface of the pole 30; then the top cover sheet 20 is sleeved on the pole 30, and the top cover sheet 20 fits tightly with the side of the sealing ring 60 away from the accommodating space 12. The setting of the sealing ring shares part of the function of the isolating member 40, that is, preventing the electrolyte from flowing out of the accommodating space 12. However, since the sealing ring does not need to consider the function of insulation (that is, non-conductive), it can have a better sealing effect. For example, a sealing ring is made of materials such as silicone or rubber specially used for sealing to improve the sealing effect. Reference Figure 2In some embodiments, the isolating member 40 includes a first portion 42 and a second portion 43; the first portion 42 is disposed on the side of the top cover sheet 20 away from the accommodating space 12, and isolates the pole 30 and the top cover sheet 20 in the normal direction of the surface of the top cover sheet 20. The second portion 43 is disposed along the axial direction of the pole 30, and is disposed between the pole and the top cover sheet, and extends toward the accommodating space 12, and isolates the pole 30 and the top cover sheet 20 in the radial direction of the pole 30. Specifically, in some embodiments, a pole hole may be opened on the top cover sheet 20, and the pole 30 is passed through the pole hole and is arranged in the top cover sheet 20. Due to reasons such as processing accuracy, there may be a gap between the pole 30 and the top cover sheet 20, for example, there may be a gap between the hole wall of the pole hole and the outer surface of the pole 30. Therefore, the second part 43 of the isolating member 40 is provided between the hole wall of the pole hole and the outer surface of the pole 30, so that the second part 43 can be sandwiched between the hole wall of the pole hole and the outer surface of the pole 30, eliminating the gap between the hole wall of the pole hole and the outer surface of the pole 30, thereby improving the sealing effect between the pole 30 and the top cover sheet 20. The second part 43 is in contact with the sealing ring 60 at one end facing the accommodating space 12. If the electrolyte leaked out when the electrolyte is injected into the accommodating space 12 is to contact the pole 30, refer to Figure 2 , the electrolyte needs to first pass through the matching gap between the separator 40 and the liquid isolation ring 50, then pass through the matching gap between the separator 40 and the top cover sheet 20, and finally reach the pole 30. Since the sealing ring 60 is arranged between the pole 30 and the top cover sheet 20, the sealing ring 60 abuts against the top cover sheet 20, and at the same time, the second part 43 of the separator 40 abuts against the sealing ring 60, so the sealing ring 60 blocks the matching gap between the separator 40 and the top cover sheet 20, so that even if the electrolyte breaks through the blocking of the liquid isolation ring 50, it can still be blocked by the sealing ring 60 in the end, further improving the effect of the top cover assembly isolating the electrolyte.

[0045] refer to Figure 1 and Figure 2 In some embodiments, the pole 30 includes a column 31 and a flange 32. The column 31 is inserted into the top cover sheet 20. The flange 32 is connected to one end of the column close to the accommodating space, and protrudes in the radial direction of the column 31 in a direction away from the column, and is arranged on one end of the column 31 close to the accommodating space 12. Along the axial direction of the column 31, the flange is arranged on the side of the top cover sheet facing the accommodating space, and the sealing ring 60 is arranged between the flange 32 and the top cover sheet 20. In this way, the sealing ring 60 can not only play a sealing role, but also play a buffering role between the top cover sheet 20 and the pole 30 in the circumferential direction of the pole 30, so as to prevent the pole 30 from damaging the top cover sheet 20 during the installation process.

[0046] In the embodiment of the present application, during assembly, the sealing ring can be sleeved on the column 31 and fit tightly with the outer surface of the column 31. The surface of the sealing ring 60 facing away from the top cover sheet 20 fits tightly with the surface of the convex edge 32 facing the top cover sheet 20; the top cover sheet 20 is sleeved on the column 31, for example, a pole hole can be opened on the top cover sheet 20, and the column 31 is passed through the pole hole and the top cover sheet 20, and the second part 43 is installed between the hole wall of the pole hole and the outer surface of the column 31, so that the second part 43 is sandwiched between the hole wall of the pole hole and the outer surface of the column 31, eliminating the gap between the hole wall of the pole hole and the outer surface of the column 31, and improving the sealing effect between the pole 30 and the top cover sheet 20. The surface of the top cover sheet 20 facing the accommodating space 12 fits tightly with the side of the sealing ring 60 facing away from the convex edge 32. Since the second portion 43 of the spacer 40 is in contact with the sealing ring 60, the sealing ring 60 blocks the matching gap between the spacer 40 and the top cover sheet 20, so that even if the electrolyte breaks through the blockage of the liquid isolation ring 50, it can still be blocked by the sealing ring 60, further improving the effect of the top cover assembly isolating the electrolyte. The sealing ring 60 is arranged between the convex edge 32 and the top cover sheet 20, so that the sealing ring 60 can not only play a sealing role, but also play a buffering role between the top cover sheet 20 and the pole 30 in the circumferential direction of the pole 30, so as to prevent the pole 30 from damaging the top cover sheet 20 during the installation process.

[0047] refer to Figure 1 In the embodiment of the present invention, the pole 30 may include a body and a riveting block, wherein the body includes a column 31 and a flange 32. During the assembly process of the pole 30, the end of the column 31 away from the flange 32 passes through the top cover sheet 20 from the side of the top cover sheet 20 close to the accommodating space 12, so that the flange 32 is like Figure 1 As shown, the pole 30 is overlapped on the side of the top cover sheet 20 facing the accommodating space 12; the column 31 passes through the riveting block set on the side of the isolation member 40 away from the top cover sheet 20, and is riveted with the riveting block through the riveting process. The diameter of the riveting block in the radial direction of the column 31 is larger than the aperture of the hole on the top cover sheet 20 for the column 31 to pass through, so the riveting block cannot pass through the hole on the top cover sheet 20 for the column 31 to pass through, and the flange 32 cannot pass through the hole on the top cover sheet 20 for the column 31 to pass through. At this time, the pole 30 clamps the top cover sheet 20 from both sides of the top cover sheet 20, so that it is installed on the top cover sheet 20. Due to the riveting process, the end of the column 31 away from the flange 32 will be deformed under the action of external force, which may generate unpredictable pressure. At this time, a sealing ring 60 is provided to buffer the pressure of the flange 32 on the top cover sheet 20 in this process, thereby protecting the top cover sheet 20.

[0048] The top cover assembly provided in the embodiment of the present application can be applied to a battery, where the battery specifically refers to a single battery (such as a square aluminum shell battery) or a battery in a battery pack, such as a battery cell. Figure 5The battery includes a shell 10, which is usually a metal shell formed by stamping, or a plastic shell formed by injection molding. The top cover sheet 20 cooperates with the opening 11 on the shell 10. When the shell 10 and the top cover sheet 20 are metal, the shell 10 and the top cover sheet 20 can be connected by welding, buckling or bonding. When at least one of the shell 10 and the top cover sheet 20 is plastic, the top cover sheet 20 and the shell 10 can be connected by interference fit, buckling or bonding. The top cover sheet 20 or the shell 10 is usually provided with a liquid injection port, that is, an opening for injecting electrolyte. When the pole piece and other structures are assembled in the accommodating space 12 of the battery, and the top cover assembly and the shell 10 have been connected, the electrolyte will be injected into the accommodating space 12 through the liquid injection port. In the process of injecting electrolyte, a small amount of electrolyte often overflows from the liquid injection port. The top cover assembly provided in the present application has a better electrolyte isolation effect, which can effectively prevent the overflowed electrolyte from flowing along the top cover sheet 20 to the pole 30, and flow from the gap between the isolation piece 40 and the top cover sheet 20 to the surface of the pole 30, thereby preventing the pole 30 from short-circuiting and damaging the battery, thereby improving the service life of the battery.

[0049] In a second aspect, an embodiment of the present application further provides a battery, comprising a housing and a top cover assembly as described in any one of the above embodiments, wherein the top cover assembly is connected to the housing.

[0050] In a third aspect, an embodiment of the present application further provides a battery pack, comprising a battery as described in any of the above embodiments. The battery pack may include one or more batteries as described in any of the above embodiments.

[0051] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0053] The top cover assembly and the battery provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A top cover assembly, characterized in that: Applied to a battery, the battery comprises a shell, the shell is provided with an opening, and the top cover assembly comprises: A top cover sheet, covering the opening and enclosing with the outer shell to form a containing space; A pole, passing through the top cover sheet; An isolating member, disposed between the pole and the top cover sheet, to isolate the pole and the top cover sheet; A liquid isolating ring is arranged on the side of the top cover sheet facing away from the accommodating space and is arranged around the pole; the liquid isolating ring protrudes from the surface of the top cover sheet in a direction away from the accommodating space and is inserted into the isolating member; the depth of the liquid isolating ring inserted into the isolating member is between 0.1 mm and 4 mm.

2. The top cover assembly according to claim 1, characterized in that: The top cover sheet and the liquid isolating ring are integrally formed.

3. The top cover assembly according to claim 2, characterized in that: The isolating member is provided with an annular groove; the liquid isolating ring is inserted into the annular groove along the axial direction of the pole and is interference-fitted with the annular groove.

4. The top cover assembly according to claim 1, characterized in that: The liquid isolation ring comprises a ring portion and a connecting portion; the ring portion surrounds the pole and protrudes from the surface of the top cover sheet; the connecting portion is arranged around one end of the ring portion close to the top cover sheet; and the connecting portion is fixedly connected to the top cover sheet.

5. The top cover assembly according to claim 4, characterized in that: The liquid isolating ring is integrally formed with the isolating member; the connecting portion protrudes from the isolating member along the radial direction of the pole.

6. The top cover assembly according to claim 4, characterized in that: The thickness of the liquid spacer ring is between 0.2 mm and 1.0 mm.

7. The top cover assembly according to claim 1, characterized in that: There are a plurality of liquid isolating rings, and the plurality of liquid isolating rings are arranged at intervals in the radial direction of the pole.

8. The top cover assembly according to claim 1, characterized in that: The top cover assembly also includes a sealing ring; the sealing ring is arranged between the pole and the top cover sheet, and isolates the pole and the top cover sheet.

9. The top cover assembly according to claim 8, characterized in that: The isolating member includes a first part and a second part; the first part is arranged on a side of the top cover sheet away from the accommodating space, and isolates the pole and the top cover sheet in a surface normal direction of the top cover sheet; the second part is arranged along the axial direction of the pole and between the pole and the top cover sheet; the second part abuts against the sealing ring at one end facing the accommodating space.

10. The top cover assembly according to claim 8, characterized in that: The pole includes a column and a flange; the column is penetrated by the top cover; the flange is connected to one end of the column close to the accommodating space, and protrudes away from the column along the radial direction of the column; along the axial direction of the column, the flange is arranged on the side of the top cover facing the accommodating space, and the sealing ring is arranged between the flange and the top cover.

11. A battery, characterized in that: It comprises a housing and a top cover assembly as described in any one of claims 1 to 10, wherein the top cover assembly is connected to the housing.

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