Top cover of battery and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover of a battery and the battery, and the top cover comprises a cover plate main body, an insulating part and a pole assembly, at least one through hole is formed in the cover plate main body, the insulating part is arranged at the through hole, the pole component is arranged at the top of the cover plate main body, the cover plate main body and the pole component are separated by the insulating part, the top surface of the cover plate main body is hermetically connected with the insulating part, and the pole component is hermetically connected with the insulating part; a first lead-out hole is formed in the insulating part, a second lead-out hole is formed in the position, corresponding to the first lead-out hole, of the pole assembly, and the pole assembly is used for being connected with the tabs sequentially penetrating out of the first lead-out hole and the second lead-out hole; the battery mainly solves the technical problem that the energy density of the battery is relatively low due to the fact that a top cover in the prior art occupies relatively much space in the battery and a gap for bending a tab exists between the top surface of a battery cell and the top cover.

Description

Technical Field

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

[0002] At present, the outer shell of lithium-ion batteries includes a shell and a top cover, wherein the battery cell is contained in the shell, and the top cover is used to seal the opening on the shell, and the top cover is also used to lead out the positive or negative electrode of the battery cell. Specifically, the existing top cover usually includes many components that occupy a large height space, such as the pole boss, the lower plastic and the adapter block, resulting in a waste of the internal space of the shell, thereby limiting the power of the battery under a certain volume. In addition, the pole ears led out of the battery cell are currently welded to the bottom of the top cover. When the pole ears are welded and the top cover seals the opening of the shell, the pole ears will bend and occupy a part of the space inside the shell, that is, there will be a gap between the top surface of the battery cell and the bottom surface of the top cover for the pole ears to bend. This gap also leads to a waste of the internal space of the battery, thereby also resulting in the battery The power under a certain volume is limited, and the energy density of the battery cannot be further improved.

[0003] Therefore, it is necessary to improve the existing technology. Utility Model Content

[0004] The utility model provides a battery top cover and a battery, mainly solving the technical problems that the top cover of the prior art occupies more space inside the battery and also leaves a gap between the top surface of the battery cell and the top cover for bending of the pole ear, thus resulting in low energy density of the battery.

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

[0006] A top cover of a battery, comprising a cover plate body, an insulating member and a pole assembly;

[0007] The cover body is provided with at least one through hole, the insulating member is provided at the through hole, the pole assembly is provided at the top of the cover body, the insulating member is provided between the cover body and the pole assembly and is used to separate the cover body and the pole assembly, and the top surface of the cover body and the insulating member, the pole assembly and the insulating member are all sealed and connected;

[0008] The insulating part is provided with a first lead-out hole for the pole tab of the battery cell to pass through, and the pole column assembly is provided with a second lead-out hole at a position corresponding to the first lead-out hole, which is also used for the pole tab of the battery cell to pass through. The pole column assembly is used to connect with the pole tab that passes through the first lead-out hole and the second lead-out hole in sequence.

[0009] In one of the technical solutions, the insulating member includes a first insulating portion, a second insulating portion and a third insulating portion connected in sequence;

[0010] The first lead-out hole sequentially passes through the first insulating portion, the second insulating portion and the third insulating portion, the second insulating portion is disposed in the through hole and is used to separate the pole ear and the hole wall of the through hole, the first insulating portion abuts against the bottom surface of the cover plate body facing the battery cell and is used to separate the battery cell and the cover plate body, and the third insulating portion abuts against the top surface of the cover plate body and is used to separate the pole assembly and the cover plate body;

[0011] The pole assembly is sealed and connected to the third insulating portion.

[0012] In one of the technical solutions, a circle of annular groove is provided on the top surface of the third insulating part, the outer edge of the pole assembly is inserted into the annular groove, and the third insulating part is sealed and connected to the pole assembly at the annular groove.

[0013] In one of the technical solutions, the pole assembly includes a pole body and a transition piece which are connected and both are conductive parts;

[0014] The adapter is provided with the second lead-out hole extending therethrough, and the pole body and the adapter are jointly arranged to form a protective space, and a side of the adapter facing the pole body is used for welding with the pole lug of the battery cell passing through the second lead-out hole, and the second lead-out hole is connected to the protective space, and the protective space is used to accommodate the pole lug; the outer edge of the pole body is inserted into the annular groove.

[0015] In one of the technical solutions, the adapter is a sheet-like structure, and a recessed groove is provided on the side of the pole body facing the adapter, so that the pole body forms a downwardly protruding annular protrusion on the outer periphery of the recessed groove, and the groove wall of the recessed groove and the outer wall of the adapter together enclose the protective space, and the annular protrusion is inserted into the annular groove.

[0016] In one of the technical solutions, a receiving groove is provided on the bottom surface of the cover body facing the battery cell, and the first insulating part is received in the receiving groove and does not exceed the bottom surface of the cover body.

[0017] In one of the technical solutions, an insulating layer is provided on the bottom surface of the cover plate body facing the battery cell.

[0018] In one of the technical solutions, two through holes are provided on the cover plate body, and an insulating member is sealed and connected to each of the two through holes. A pole assembly is sealed and connected to each of the two insulating members, and the polarities of the two pole assemblies are opposite to each other.

[0019] In one of the technical solutions, the top cover also includes an explosion-proof valve assembly, the cover plate body is provided with a through hole, and the explosion-proof valve assembly includes a protective net, an explosion-proof valve body and a protective sheet which are arranged in sequence from the inside to the outside and are all connected to the cover plate body; the protective net and the explosion-proof valve body are both arranged in the hole, and the protective net does not exceed the bottom surface of the cover plate body.

[0020] The present application also provides a battery, comprising a shell, a battery cell and a top cover as described in any one of the above items, wherein the shell is provided with an open mounting groove, the battery cell is accommodated in the mounting groove, the cover plate body seals the notch of the mounting groove, and the pole lugs led out from the battery cell pass through the first lead-out hole and the second lead-out hole in sequence and are connected to the pole assembly.

[0021] Compared with the prior art, the top cover of the battery provided by the utility model has at least the following beneficial effects:

[0022] By adopting this solution, the tabs led out from the battery cell can be sequentially passed through the first lead-out hole of the insulating member and the second lead-out hole of the pole assembly and connected to the pole assembly, so that the tabs do not need to be welded to the bottom of the top cover, that is, no gap for the tabs to bend is required between the top surface of the battery cell and the bottom surface of the top cover, so that the battery cell can be made higher and closer to the bottom surface of the top cover, thereby increasing the amount of electricity in a certain volume of the battery, that is, the energy density of the battery can be increased;

[0023] Secondly, compared with the traditional top cover including components such as the lower plastic, the pole boss, the adapter block, etc. that occupy a large amount of space, the top cover of this solution has a simpler structure. At the same time, the pole assembly arranged on the top of the cover body does not occupy the space inside the battery, thereby greatly improving the space utilization inside the battery, and more space can be used to increase the height of the battery cell, thereby further improving the battery's power under a certain volume, that is, further improving the battery's energy density. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0026] Figure 2 for Figure 1An exploded view of the battery shown;

[0027] Figure 3 for Figure 1 A cross-sectional view of the battery shown at the pole position;

[0028] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0029] Figure 5 A schematic diagram of the structure of the top cover provided in the embodiment of the present application;

[0030] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0031] Figure 7 for Figure 5 A schematic diagram of the structure of the top cover shown at another angle;

[0032] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0033] Fig. 9 for Figure 1 A cross-sectional view of the battery shown in the location of the explosion-proof valve assembly;

[0034] Fig.10 for Fig. 9 A partial enlarged view of point D in the middle.

[0035] Reference numerals:

[0036] 10. top cover; 20. housing; 201. mounting slot; 30. battery cell; 301. tab;

[0037] 1. Cover plate body; 11. Through hole; 12. Hole position; 13. Annular groove; 14. Receiving groove;

[0038] 2. Insulating member; 21. First insulating portion; 22. Second insulating portion; 23. Third insulating portion; 231. Annular groove; 24. First lead-out hole;

[0039] 3. Pole assembly; 31. Pole body; 311. Concave groove; 312. Annular protrusion; 32. Adapter; 321. Second lead-out hole; 33. Protection space;

[0040] 4. Explosion-proof valve assembly; 41. Protection net; 42. Explosion-proof valve body; 43. Protection sheet; 5. Insulation layer. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the orientations or positional relationships indicated by terms such as "upper", "lower", "top", "bottom", "inside", and "outside" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do 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 should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0046] Please also read Figures 1 to 4 The embodiment of the utility model provides a battery, including a top cover 10, a shell 20 and a battery cell 30, wherein an open mounting groove 201 is provided in the shell 20, and the battery cell 30 is transferred into the mounting groove 201, and one or more battery cells 30 can be accommodated in the mounting groove 201, wherein the top cover 10 includes a connected cover body 1 and a pole assembly 3, the cover body 1 and the shell 20 are welded and the notch of the mounting groove 201 is sealed to prevent foreign matter from entering the mounting groove 201, and the pole ear 301 led out from the battery cell 30 and the pole assembly 3 are electrically connected by welding. In other words, the pole assembly 3 plays the role of leading out the electrode as the positive pole or the negative pole on the battery cell 30, so as to realize the function that the internal battery cell 30 can discharge to the outside or the external power supply can charge the internal battery cell 30.

[0047] Please also read Figures 1 to 6The top cover 10 also includes an insulating member 2, wherein at least one through hole 11 is provided on the cover body 1, and the above-mentioned insulating member 2 is provided at the through hole 11, and the insulating member 2 is provided between the cover body 1 and the pole assembly 3, and the insulating member 2 is used to separate the cover body 1 and the pole assembly 3, so that the cover body 1 is not charged or has another polarity opposite to the polarity of the pole assembly 3. For specific understanding, please refer to the following two paragraphs:

[0048] Two through holes 11 can be set on the cover body 1, and an insulating part 2 is sealed at each through hole 11. A pole assembly 3 is sealed and connected to the two insulating parts 2, so that there are two pole assemblies 3 on the top cover 10, and the polarities of the two pole assemblies 3 are opposite, that is, one of the pole assemblies 3 leads to the positive electrode of the internal battery cell 30, and the other pole assembly 3 leads to the negative electrode of the internal battery cell 30. The shell 20 of the battery with this structure is usually designed to be non-charged.

[0049] The cover body 1 may also be provided with only one through hole 11 , and the housing 20 may be provided to be charged, and the polarity of the housing 20 and the polarity of the pole assembly 3 located at the through hole 11 are opposite to each other.

[0050] Please read again Figures 1 to 8 The pole assembly 3 is arranged on the top of the cover body 1, and the insulating member 2 is provided with a first lead-out hole 24. The pole assembly 3 is provided with a second lead-out hole 321 at a position corresponding to the first lead-out hole 24. The pole lug 301 of the battery cell 30 sequentially passes through the first lead-out hole 24 and the second lead-out hole 321 and is welded to the pole assembly 3, thereby realizing the electrical connection between the pole assembly 3 and the pole lug 301 of the battery cell 30. When there are multiple battery cells 30 inside the battery, the pole lugs 301 of the same polarity of the multiple battery cells 30 can pass through the same first lead-out hole 24 and the second lead-out hole 321 in sequence and be welded to the same pole assembly 3. By such a design, the pole ear 301 does not need to be welded to the bottom of the top cover 10, that is, there is no need to set a gap between the top surface of the battery cell 30 and the bottom surface of the top cover 10 for the pole ear 301 to bend, so that the battery cell 30 can be made higher and closer to the bottom surface of the top cover 10, thereby increasing the amount of electricity in a certain volume of the battery, that is, the energy density of the battery can be increased. Compared with the traditional top cover including components such as the lower plastic, the pole boss, and the adapter block that occupy a large amount of space, the structure of the above-mentioned top cover 10 is simpler, and the pole assembly 3 arranged on the top of the cover body 1 does not occupy the space inside the battery, thereby greatly improving the space utilization rate inside the battery, and more space can be used to increase the height of the battery cell 30, thereby further increasing the amount of electricity in a certain volume of the battery, that is, further improving the energy density of the battery.

[0051] Please also read Figures 3 to 8The insulating member 2 includes a first insulating portion 21, a second insulating portion 22 and a third insulating portion 23 which are connected in sequence, wherein the first lead-out hole 24 passes through the first insulating portion 21, the second insulating portion 22 and the third insulating portion 23 in sequence, the second insulating portion 22 is arranged in the through hole 11, and the second insulating portion 22 is used to separate the pole ear 301 and the hole wall of the through hole 11 to prevent the pole ear 301 and the cover body 1 from being connected and causing a short circuit, and the first insulating portion 21 abuts against the bottom surface of the cover body 1 facing the battery cell 30, the first insulating portion 21 is used to separate the top surface of the battery cell 30 and the bottom surface of the cover body 1 to prevent the cover body 1 and the battery cell 30 from being connected and causing a short circuit, the third insulating portion 23 abuts against the top surface of the cover body 1 and is used to separate the pole assembly 3 and the top surface of the cover body 1 to prevent the cover body 1 and the pole assembly 3 from being connected and causing a short circuit, by adopting the insulating member 2 with such a structural design, the risk of the cover body 1 being charged and easily causing a short circuit can be greatly reduced. Preferably, the insulating member 2 is formed by placing the cover body 1 into a mold for injection molding. By molding the insulating member 2 in the mold, on the one hand, it is convenient to form the above-mentioned first insulating part 21, second insulating part 22 and third insulating part 23. On the other hand, when the insulating member 2 is injection-molded, there is better sealing between the insulating member 2 and the cover body 1, thereby preventing the electrolyte inside the battery from leaking out along the gap between the insulating member 2 and the cover body 1, and also preventing external liquid from flowing into the battery along the gap between the insulating member 2 and the cover body 1, thereby improving the reliability and safety of battery use.

[0052] Please also read Figures 3 to 6 In order to prevent the electrolyte inside the battery from leaking outward from the gap between the pole assembly 3 and the third insulating part 23, and also to prevent external liquid from flowing into the battery from the gap between the pole assembly 3 and the third insulating part 23, in this regard, the present embodiment can apply a circle of sealant or a circle of plastic layer of nano injection molding on the periphery where the pole assembly 3 and the third insulating part 23 contact each other, so as to achieve a sealed connection between the pole assembly 3 and the third insulating part 23. Preferably, a circle of annular groove 231 is provided on the top surface of the third insulating part 23, and the outer edge of the pole assembly 3 is inserted into the annular groove 231. It is only necessary to inject sealant into the annular groove 231 or perform nano injection molding to form a sealing layer in the annular groove 231. This sealing layer can block the gap between the third insulating part 23 and the pole assembly 3, thereby achieving a sealed connection between the pole assembly 3 and the third insulating part 23. By providing the annular groove 231 , a larger amount of the sealing layer between the third insulating portion 23 and the pole assembly 3 can be used, thereby improving the reliability of maintaining a sealed connection between the third insulating portion 23 and the pole assembly 3 .

[0053] Please also read Figure 4 and Figure 6The top surface of the cover body 1 is provided with a circle of annular grooves 13 on the periphery of the through hole 11, and the annular grooves 13 are directly opposite to the area where the annular grooves 231 of the third insulating part 23 are provided. By providing a circle of annular grooves 13, the portion of the third insulating part 23 that protrudes downward in the area of ​​the annular grooves 231 can be accommodated in the annular grooves 13, thereby reducing the thickness of the third insulating part 23 that needs to be designed, which is beneficial to increase the height of the battery cell 30 at a certain height, that is, it is beneficial to improve the power and energy density of the battery.

[0054] Please also read Figures 3 to 8 The pole assembly 3 specifically includes a pole body 31 and an adapter 32, both of which are metal conductive parts, wherein the above-mentioned second lead-out hole 321 is provided in the middle of the adapter 32, and the second lead-out hole 321 runs through the entire adapter 32, and the pole ear 301 of the above-mentioned battery cell 30 is welded on the top surface of the adapter 32 facing away from the battery cell 30 (that is, the pole ear 301 of the battery cell 30 is welded on the side of the adapter 32 facing the pole body 31), and the pole body 31 and the adapter 32 are electrically connected. The pole body 31 and the adapter 32 can be electrically connected in a manner that the two are directly welded to each other, and the pole body 31 and the adapter 32 can also be electrically connected in a manner that the pole body 31 and the pole ear 301 are welded. Since the pole ear 301 and the adapter 32 are welded, the pole body 31 is electrically connected to the adapter 32 through the pole ear 301. At least one of the above two methods can be used to achieve the electrical connection between the pole body 31 and the adapter 32. In addition, the pole body 31 and the adapter 32 are jointly enclosed to form a protection space 33, and the protection space 33 and the second lead-out hole 321 are interconnected, and the pole lug 301 on the battery cell 30 is located in the protection space 33 after passing through the second lead-out hole 321. It can be seen that by designing the pole assembly 3 as a pole body 31 and an adapter 32 connected separately, a protection space 33 for protecting the pole lug 301 can be formed, thereby solving the problem that the pole lug 301 is easily damaged by external forces. In addition, the outer edge of the pole body 31 is inserted into the above-mentioned annular groove 231, thereby realizing a sealed connection between the pole body 31 and the third insulating part 23, preventing the trace electrolyte that may leak into the protection space 33 from leaking outward from the gap between the pole body 31 and the third insulating part 23, and also preventing foreign substances from entering the protection space 33 from the gap between the pole body 31 and the third insulating part 23, thereby preventing foreign substances from entering the interior of the battery.

[0055] Please read again Figures 3 to 8, the adapter 32 is a flat sheet structure, and a concave groove 311 is provided on the side of the pole body 31 facing the adapter 32, so that the pole body 31 forms an annular protrusion 312 protruding downward on the outer periphery of the concave groove 311, and the groove wall of the concave groove 311 and the outer wall surface of the adapter 32 are jointly formed to form the above-mentioned protection space 33, and the annular protrusion 312 is inserted into the above-mentioned annular groove 231, so as to facilitate the sealed connection between the pole body 31 and the third insulating part 23. During installation, the pole lug 301 is welded to the adapter 32, and then the pole body 31 is covered on the top surface of the adapter 32 and welded to the adapter 32 or the pole lug 301 to prevent the pole lug 301 from being exposed to the outside, and at the same time, the annular protrusion 312 on the outer ring of the pole body 31 needs to be inserted into the annular groove 231 at the top of the insulating member 2. Through such a design, while achieving the formation of the protection space 33, the flat adapter 32 also facilitates the secure welding of the pole ear 301 of the battery cell 30 to the top surface of the adapter 32, and also makes it easy for the pole body 31 to be plugged into the annular groove 231.

[0056] Please also read Figure 4 and Figure 8 In this embodiment, a receiving groove 14 is provided on the bottom surface of the cover body 1 facing the battery cell. The first insulating portion 21 is received in the receiving groove 14 and does not exceed the bottom surface of the cover body 1, so that the top cover 10 does not occupy the space in the installation groove 201, which is conducive to freeing up more space for the battery cell 30 and improving the battery power and energy density.

[0057] Preferably, in order to increase the power, the top surface of the battery cell 30 of the present solution is equivalent to being very close to the bottom surface of the top cover 10 or even directly against the bottom surface of the top cover 10. In order to solve the problem that the bottom surface of the cover body 1 is in direct contact with the battery cell 30, causing the cover body 1 to be charged and easily cause a short circuit, an insulating layer 5 can be provided on the bottom surface of the cover body 1 facing the battery cell 30. The insulating layer 5 can be achieved by applying insulating paint on the bottom surface of the cover body 1, or the insulating layer 5 can also be an insulating component located between the cover body 1 and the battery cell 30. The thickness of the insulating layer 5 can be designed to be thinner 0.001mm-0.5mm.

[0058] Please also read Figure 1 , Figure 2 , Fig. 9 and Fig.10The top cover 10 also includes an explosion-proof valve assembly 4. A through hole 12 is set on the cover body 1. The explosion-proof valve assembly 4 is set at the hole 12 and is used to allow the battery to exhaust gas from the hole 12 in time when thermal runaway occurs, thereby reducing the risk of battery explosion. The explosion-proof valve assembly 4 specifically includes a protective net 41, an explosion-proof valve body 42 and a protective sheet 43 which are arranged in sequence from the inside to the outside and are all fixedly connected to the cover plate body 1. The explosion-proof valve body 42 is arranged in the hole 12. When thermal runaway occurs inside the battery, the gas inside the battery will break through the explosion-proof valve body 42, thereby venting and relieving the gas and pressure to the outside. The mesh holes inside the protective net 41 can allow the gas inside the battery to pass through and act on the explosion-proof valve body 42, thereby realizing the basic explosion-proof function. The protective net 41 also plays a role in supporting the explosion-proof valve body 42 to prevent the explosion-proof valve body 42 from falling into the battery after breaking and easily causing a short circuit. The protective sheet 43 is used to prevent external objects from acting on the explosion-proof valve body 42 and causing the explosion-proof valve body 42 to break, that is, to prevent the explosion-proof valve body 42 from breaking when the battery has not thermal runaway, thereby ensuring that the battery has a higher safety and reducing the risk of battery leakage. Preferably, the protective net 41 of the present solution is also arranged in the hole 12, and the protective net 41 does not exceed the bottom surface of the cover body 1 facing the battery cell 30, so that the top cover 10 does not occupy the space inside the mounting groove 201, and the top surface of the battery cell 30 can be as close to the bottom surface of the top cover 10 as possible or even fit with the bottom surface of the top cover 10, thereby increasing the power of the battery under a certain volume, that is, the energy density of the battery can be increased.

[0059] The above are only preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for the purpose of explaining the principles of the present invention, and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanation here, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention, and other specific implementation methods of the present invention that can be associated with by technicians in this field without creative labor, should be included in the scope of protection of the present invention.

Claims

1. A battery top cover, characterized in that: It comprises a cover plate body (1), an insulating member (2) and a pole assembly (3); The cover plate body (1) is provided with at least one through hole (11) extending therethrough, the insulating member (2) being provided at the through hole (11), the pole assembly (3) being provided at the top of the cover plate body (1), the insulating member (2) being provided between the cover plate body (1) and the pole assembly (3) and being used to separate the cover plate body (1) and the pole assembly (3), the top surface of the cover plate body (1) and the insulating member (2), and the pole assembly (3) and the insulating member (2) being sealedly connected; The insulating member (2) is provided with a first lead-out hole (24) for the pole tab of the battery core to pass through, the pole column assembly (3) is provided with a second lead-out hole (321) also for the pole tab of the battery core to pass through at a position corresponding to the first lead-out hole (24), and the pole column assembly (3) is used to connect to the pole tab that passes through the first lead-out hole (24) and the second lead-out hole (321) in sequence.

2. The top cover of the battery as claimed in claim 1, characterized in that: The insulating member (2) comprises a first insulating portion (21), a second insulating portion (22) and a third insulating portion (23) which are connected in sequence; The first lead-out hole (24) sequentially passes through the first insulating portion (21), the second insulating portion (22) and the third insulating portion (23); the second insulating portion (22) is disposed in the through hole (11) and is used to separate the pole lug from the hole wall of the through hole (11); the first insulating portion (21) abuts against the bottom surface of the cover plate body (1) facing the battery cell and is used to separate the battery cell from the cover plate body (1); the third insulating portion (23) abuts against the top surface of the cover plate body (1) and is used to separate the pole assembly (3) from the cover plate body (1); The pole assembly (3) is sealedly connected to the third insulating portion (23).

3. The top cover of the battery as claimed in claim 2, characterized in that: The top surface of the third insulating portion (23) is provided with an annular groove (231), the outer edge of the pole assembly (3) is inserted into the annular groove (231), and the third insulating portion (23) is sealedly connected to the pole assembly (3) at the annular groove (231).

4. The top cover of the battery as claimed in claim 3, characterized in that: The pole assembly (3) comprises a pole body (31) and a transition piece (32) which are connected and both are conductive parts; The adapter (32) is provided with a penetrating second lead-out hole (321); the pole body (31) and the adapter (32) are jointly arranged to form a protective space (33); a surface of the adapter (32) facing the pole body (31) is used for welding with a pole lug of the battery cell passing through the second lead-out hole (321); the second lead-out hole (321) is communicated with the protective space (33); and the protective space (33) is used for accommodating the pole lug; The outer edge of the pole body (31) is inserted into the annular groove (231).

5. The top cover of the battery as claimed in claim 4, characterized in that: The adapter (32) is a sheet-like structure, and a concave groove (311) is provided on a side of the pole body (31) facing the adapter (32), so that the pole body (31) forms an annular protrusion (312) protruding downward on the periphery of the concave groove (311), and the groove wall of the concave groove (311) and the outer wall of the adapter (32) are jointly enclosed to form the protection space (33), and the annular protrusion (312) is inserted into the annular groove (231).

6. The top cover of the battery as claimed in claim 2, characterized in that: A receiving groove (14) is provided on the bottom surface of the cover plate body (1) facing the battery core, and the first insulating portion (21) is received in the receiving groove (14) and does not extend beyond the bottom surface of the cover plate body (1).

7. The top cover of the battery as claimed in claim 1, characterized in that: An insulating layer (5) is provided on the bottom surface of the cover plate body (1) facing the battery core.

8. The top cover of the battery as claimed in claim 1, characterized in that: The cover plate body (1) is provided with two through holes (11), each of the two through holes (11) is sealedly connected to an insulating member (2), each of the two insulating members (2) is sealedly connected to a pole assembly (3), and the polarities of the two pole assemblies (3) are opposite to each other.

9. The top cover of the battery as claimed in claim 1, characterized in that: The top cover further comprises an explosion-proof valve assembly (4); a through hole (12) is provided on the cover plate body (1); the explosion-proof valve assembly (4) comprises a protection net (41), an explosion-proof valve body (42) and a protection sheet (43) which are arranged in sequence from the inside to the outside and are all connected to the cover plate body (1); the protection net (41) and the explosion-proof valve body (42) are both arranged in the hole (12), and the protection net (41) does not extend beyond the bottom surface of the cover plate body (1).

10. A battery, characterized in that: The invention comprises a shell (20), a battery cell (30) and a top cover (10) according to any one of claims 1 to 9, wherein the shell (20) is provided with an open mounting groove (201), the battery cell (30) is received in the mounting groove (201), the cover body (1) seals the notch of the mounting groove (201), and the electrode lug (301) led out from the battery cell (30) passes through the first lead-out hole (24) and the second lead-out hole (321) in sequence and is connected to the pole assembly (3).

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