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, the top cover comprises a cover plate main body, an insulating part and at least two protective plates, the cover plate main body is provided with at least one through hole, the insulating part is arranged at the through hole, the insulating part is provided with a lead-out hole for a tab of a battery cell to penetrate through, and the two protection plates are of a split structure or a connected integrated structure. The two protection plates are both used for being connected with the tab penetrating out of the lead-out hole, and the two protection plates are arranged on the two opposite sides of the tab respectively; the cover plate main body is in sealed connection with the insulating part, and the two protection plates are both in sealed connection with the insulating part; 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 comprises a cover plate body, an insulating member and at least two protective plates;

[0007] The cover plate body is provided with at least one through hole, the through hole is provided with the insulating member, the insulating member is provided with a lead-out hole for the pole ear of the power supply core to pass through, the two protection plates are a separate structure or a connected integral structure, the two protection plates are used to connect with the pole ear passing outward from the lead-out hole, and the two protection plates are respectively provided on two opposite sides of the pole ear;

[0008] The cover plate body is sealed and connected to the insulating member, and both of the protection plates are sealed and connected to the insulating member.

[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 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 protection plate and the cover plate body;

[0011] The two protection plates are respectively sealed and connected to the third insulating part.

[0012] In one of the technical solutions, a first receiving groove is provided on the top surface of the cover body facing away from the battery cell, and the third insulating portion is received in the first receiving groove and abuts against the bottom of the first receiving groove.

[0013] In one of the technical solutions, a second receiving groove is provided on the bottom surface of the cover body facing the battery cell, and the first insulating portion is received in the second receiving groove and does not exceed the bottom surface of the cover body.

[0014] In one of the technical solutions, the top surface of the insulating member is provided with grooves on both opposite sides of the lead-out hole, part of one of the protective plates is accommodated in one of the grooves, and part of the other protective plate is accommodated in the other groove, and the insulating member is sealed and connected to the two protective plates in the grooves respectively.

[0015] In one of the technical solutions, an insulating layer is provided on the bottom surface of the cover plate body facing the battery cell.

[0016] 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. The lead-out hole on one of the insulating members is used for allowing a pole ear with a first polarity to pass outward, and the lead-out hole on the other insulating member is used for allowing a pole ear with a second polarity to pass outward, wherein the first polarity and the second polarity are opposite to each other, and the protective plate is connected to the opposite sides of each pole ear.

[0017] 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.

[0018] 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, the pole lugs led out from the battery cell are inserted into the lead-out holes, and the pole lugs are respectively connected to the two protective plates.

[0019] In one of the technical solutions, the pole lug and the two protection plates connected to the pole lug together constitute a pole lug assembly, and the pole lug assembly is sealed and connected to the insulating member.

[0020] Compared with the prior art, the top cover of the battery provided by the utility model has at least the following beneficial effects:

[0021] By adopting this solution, the tabs led out of the battery cell can be exposed outwards through the lead-out holes on the insulating member, wherein the exposed portion of the tabs is protected by at least two protective plates, thereby solving the problem of easy damage to the tabs; by adopting this solution, the tabs do not need to be welded to the bottom of the top cover, that is, there is no need to set a gap between the top surface of the battery cell and the bottom surface of the top cover for the tabs to bend, 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;

[0022] More specifically, compared with the traditional top cover including the lower plastic, pole boss, adapter block and other components that occupy a large amount of space, the top cover of this solution has a simpler structure, and the way the pole ear is inserted outward 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. Among them, the insulating member and the cover body are sealed and connected, and the two protective plates are sealed and connected to the insulating member, thereby effectively preventing foreign substances from entering the battery, and also preventing the electrolyte inside the battery from leaking out. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 A schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0025] Figure 2 for Figure 1An exploded view of the battery shown;

[0026] Figure 3 for Figure 1 A cross-sectional view of the battery shown at the location of the insulating member;

[0027] Figure 4 for Figure 3 A partial enlarged view of the middle A;

[0028] Figure 5 A schematic diagram of the structure of the top cover provided in the embodiment of the present application;

[0029] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;

[0030] Figure 7 for Figure 5 A schematic diagram of the structure of the top cover shown at another angle;

[0031] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0032] Fig. 9 for Figure 1 A cross-sectional view of the battery shown in the location of the explosion-proof valve assembly;

[0033] Fig.10 for Fig. 9 A partial enlarged view of point D in the middle.

[0034] Reference numerals:

[0035] 10. top cover; 20. housing; 201. mounting slot; 30. battery cell; 301. tab;

[0036] 1. Cover plate body; 11. Through hole; 12. Hole position; 13. First receiving groove; 14. Second receiving groove;

[0037] 2. Insulating member; 21. First insulating portion; 22. Second insulating portion; 23. Third insulating portion; 24. Lead-out hole; 25. Groove;

[0038] 3. Protection plate; 4. Explosion-proof valve assembly; 41. Protection net; 42. Explosion-proof valve body; 43. Protection sheet; 5. Insulation layer. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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. The mounting groove 201 can accommodate one or more battery cells 30. When there are multiple battery cells 30 in the mounting groove 201, the same electrodes of the multiple battery cells 30 are connected together to form a pole ear 301. Among them, the top cover 10 includes a cover body 1 and a protective plate 3. The cover body 1 and the shell 20 are welded and the notch of the installation groove 201 is sealed to prevent foreign matter from entering the installation groove 201. The pole ear 301 led out from the battery cell 30 and the protective plate 3 are electrically connected by welding. The protective plate 3 plays a role in protecting the pole ear 301 on the battery cell 30. Each pole ear 301 has a protective plate 3 on two opposite sides, so as to better hide the pole ear 301 on the inner side of the protective plate 3, thereby better protecting the pole ear 301 and avoiding the phenomenon that the pole ear 301 is easily damaged.

[0045] Please also read Figures 1 to 6, the top cover 10 also includes an insulating member 2, wherein at least one through hole 11 is provided on the cover body 1, the insulating member 2 is provided at the through hole 11, the lead-out hole 24 is provided on the insulating member 2, the tab 301 of the battery cell 30 passes out from the lead-out hole 24, and the two opposite sides of the tab 301 passing through the lead-out hole 24 are connected with the protective plate 3, and the two protective plates 3 connected to the same tab 301 can be either a separate structure or an integrated structure connected to each other. Among them, the cover body 1 and the insulating member 2 need to be sealed and connected to prevent the electrolyte from leaking outward from the through hole 11 along the gap between the cover body 1 and the insulating member 2, and also prevent foreign substances from entering the battery from the gap between the cover body 1 and the insulating member 2. In addition, the two protective plates 3 connected to the same tab 301 are also sealed and connected to the insulating member 2 to prevent the electrolyte from leaking outward from the lead-out hole 24, and also prevent foreign substances from entering the battery from the lead-out hole 24. Preferably, each pole lug 301 and the corresponding two protective plates 3 together form a pole lug assembly, and the entire pole lug assembly and the insulating part 2 need to be sealed and connected. For example, the entire pole lug assembly and the insulating part 2 are sealed and connected by means of sealant injection or nano injection molding, thereby further ensuring that the electrolyte will not leak out from the lead-out hole 24, and at the same time further ensuring that foreign matter is prevented from entering the battery from the lead-out hole 24.

[0046] The process of connecting the battery cell 30 and the top cover 10 to each other can be selected in the following two ways:

[0047] The first method is to install the insulating member 2 on the cover body 1 in advance, and weld the two protection plates 3 and the tabs 301 led out of the battery cell 30 in advance, so that the tabs 301 are provided with protection plates 3 on both sides opposite to each other. At this time, the tabs 301 and the two connected protection plates 3 together constitute a tab assembly, and then the entire tab assembly is passed outward from the lead-out hole 24, and finally the gap between the entire tab assembly and the insulating member 2 is sealed by injecting sealant or nano injection molding;

[0048] The second method: the insulating member 2 is pre-installed on the cover body 1, and then the pole ear 301 is passed out from the lead-out hole 24, and then two protective plates 3 are welded to the portion of the pole ear 301 passing out from the lead-out hole 24. At this time, the pole ear 301 and the two connected protective plates 3 together constitute a pole ear assembly, and finally the gap between the entire pole ear assembly and the insulating member 2 is sealed by injecting sealant or nano injection molding;

[0049] As can be seen from the above, by adopting this solution, the tab 301 led out from the battery cell 30 can be exposed outward after passing through the lead-out hole 24 on the insulating member 2, and the tab 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 tab 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 top cover 10 of this solution is obviously simpler, and the way the tab 301 passes outward 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.

[0050] In this embodiment, two through holes 11 are provided on the cover body 1, and an insulating member 2 is sealed at each through hole 11. The lead-out hole 24 on one of the insulating members 2 is used for allowing the pole ear with a first polarity to pass outward, and the lead-out hole 24 on the other insulating member 2 is used for allowing the pole ear with a second polarity to pass outward, wherein one of the first polarity and the second polarity is a positive pole, and the other is a negative pole, and a protective plate 3 is connected to the opposite sides of each pole ear.

[0051] In other embodiments, only one through hole 11 may be provided on the cover body 1, and the shell 20 is provided to be charged, and the polarity of the shell 20 is opposite to the polarity of the pole ear 301 extending outward relative to the through hole 11, that is, one of the shell 20 and the pole ear 301 extending outward is the positive pole and the other is the negative pole.

[0052] 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 above-mentioned 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 above-mentioned 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 protection plate 3 and the top surface of the cover body 1 to prevent the cover body 1 and the protection plate 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 in 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, the second insulating part 22 and the third insulating part 23. On the other hand, when the insulating member 2 is injection molded, the insulating member 2 and the cover body 1 have better sealing, thereby preventing the electrolyte inside the battery from leaking outward 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. In addition, the above-mentioned tab assembly containing two protective plates 3 can be sealed and connected with the third insulating part 23 by injecting sealant or performing nano-injection molding in the mold, thereby preventing the electrolyte from leaking outward from the lead-out hole 24, and also preventing foreign substances from entering the battery from the lead-out hole 24.

[0053] Please also read Figure 4 and Figure 6 The top surface of the insulating member 2 is provided with grooves 25 on both sides opposite to the lead-out hole 24. Each groove 25 is used to accommodate a corresponding protection plate 3. A sealing layer can be formed in the groove 25 by injecting sealant into each groove 25 or performing nano injection molding. This sealing layer can block the gap between the third insulating part 23 and the two protection plates 3, thereby realizing the function of sealing the two protection plates 3 with the third insulating part 23. By providing the grooves 25 on the top surface of the insulating member 2, the amount of the sealing layer between the third insulating part 23 and the two protection plates 3 can be increased, thereby improving the reliability of maintaining a sealed connection between the third insulating part 23 and the two protection plates 3.

[0054] Please also read Figure 4 , Figure 6 and Figure 8The top surface of the cover body 1 facing away from the battery cell 30 is provided with a first receiving groove 13, and the bottom surface of the cover body 1 facing the battery cell 30 is provided with a second receiving groove 14. The third insulating portion 23 is received in the first receiving groove 13 and abuts against the bottom of the first receiving groove 13. The first insulating portion 21 is received in the second receiving groove 14. By such a design, the reliability of the seal between the insulating member 2 and the cover body 1 can be improved, and the total thickness of the top cover 10 can also be reduced, which is beneficial to improving the energy density of the battery. Preferably, after the first insulating portion 21 is received in the second receiving groove 14, it 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 in the installation groove 201, which is beneficial to free up more space for the battery cell 30, and further improves the battery power and energy density.

[0055] Please also read Figure 2 and Figure 4 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 contacts 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 coating the bottom surface of the cover body 1 with insulating paint, 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.

[0056] 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 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 exhausting the gas and relieving the 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. 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.

[0057] 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 at least two protective plates (3); The cover plate body (1) is provided with at least one through hole (11) extending therethrough, the insulating member (2) is provided at the through hole (11), the insulating member (2) is provided with a lead-out hole (24) for the pole lug of the power supply core to pass through, the two protection plates (3) are a separate structure or a connected integral structure, the two protection plates (3) are used to connect to the pole lug passing outward from the lead-out hole (24), and the two protection plates (3) are provided on opposite sides of the pole lug; The cover plate body (1) is sealedly connected to the insulating member (2), and both of the protection plates (3) are sealedly connected to the insulating member (2).

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 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 ear 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 protection plate (3) from the cover plate body (1); The two protection plates (3) are respectively sealed and connected to the third insulating portion (23).

3. The top cover of the battery as claimed in claim 2, characterized in that: A first receiving groove (13) is provided on the top surface of the cover plate body (1) facing away from the battery core, and the third insulating portion (23) is received in the first receiving groove (13) and abuts against the bottom of the first receiving groove (13).

4. The top cover of the battery as claimed in claim 2, characterized in that: A second 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 second receiving groove (14) and does not extend beyond the bottom surface of the cover plate body (1).

5. The top cover of the battery as claimed in claim 1, characterized in that: The top surface of the insulating member (2) is provided with grooves (25) on both sides opposite to the lead-out hole (24); a portion of one of the protective plates (3) is received in one of the grooves (25); a portion of the other protective plate (3) is received in the other groove (25); and the insulating member (2) is sealed and connected to the two protective plates (3) in the grooves (25).

6. 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.

7. 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), and each of the two through holes (11) is sealedly connected to an insulating member (2), wherein the lead-out hole (24) on one of the insulating members (2) is used for allowing a pole lug with a first polarity to pass outward, and the lead-out hole (24) on the other of the insulating members (2) is used for allowing a pole lug with a second polarity to pass outward, wherein the first polarity and the second polarity are opposite to each other, and the protective plate (3) is connected to opposite sides of each pole lug.

8. 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).

9. 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 8, 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), the pole lug (301) led out of the battery cell (30) is passed through the lead-out hole (24), and the pole lug (301) is respectively connected to the two protection plates (3).

10. The battery according to claim 9, characterized in that The pole lug (301) and the two protection plates (3) connected to the pole lug (301) together form a pole lug assembly, and the pole lug assembly is sealed and connected to the insulating member (2).

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