Battery cover plate assembly and battery

Abstract

The utility model discloses a battery cover plate assembly and a battery, the battery cover plate assembly comprises a cover plate body and a valve body, and the cover plate body is provided with a liquid injection hole; the valve body is detachably arranged in the liquid injection hole and comprises a base body part, a hollow cavity is formed in the base body part, the bottom end of the base body part is an open end, and the open end communicates with the hollow cavity; the bottom end of the base body part is provided with a clamping jaw part which is perpendicular to the axial direction of the base body part and extends towards the side away from the hollow cavity, the top end of the base body part is a closed end, the closed end is provided with a covering part for blocking the hollow cavity, and the covering part covers the hollow cavity and extends towards the side away from the hollow cavity; the base body part is assembled in the liquid injection hole and is in interference fit with the inner wall face of the liquid injection hole, and the clamping jaw part and the covering part are in abutting fit with the two opposite side walls, in the axial direction of the base body part, of the cover plate body correspondingly, so that the valve body is in sealing fit with the cover plate body. The battery cover plate assembly has a good sealing effect on the liquid injection hole, can realize repeated liquid injection operation, and prolongs the service life of the battery.

Description

TECHNICAL FIELD

[0001] The utility model belongs to secondary battery safety technical field, concretely relates to a battery cover plate subassembly and battery. BACKGROUND

[0002] At present, the battery will inject electrolyte into the battery through the liquid injection hole on the cover plate during the process, and the liquid injection hole is sealed by laser after the liquid injection is completed. Once the liquid injection hole is sealed, it cannot be reworked. If the amount of injected electrolyte is abnormal or unstable during the process, the battery's subsequent liquid retention coefficient will not meet the standard, and the battery cannot be reworked to inject electrolyte again, which affects the battery's pass rate and performance. In addition, gas will be generated inside the battery during use, which will consume electrolyte and cause the battery's performance to decline or become abnormal, so the battery can only be scrapped or downgraded for use, affecting the battery's service life. SUMMARY

[0003] In view of the above defects or deficiencies in the prior art, it is desirable to provide a battery cover plate subassembly, a battery and an electrical equipment.

[0004] The first aspect of the utility model provides a battery cover plate subassembly, which comprises:

[0005] A cover plate body has a liquid injection hole, and the liquid injection hole penetrates the cover plate body;

[0006] A valve body is detachably arranged in the liquid injection hole, the valve body comprises a base body portion, the base body portion has a hollow cavity therein and an open end at the bottom end, and the open end is in communication with the hollow cavity; the bottom end of the base body portion is provided with a clamping jaw portion extending along the axial direction perpendicular to the base body portion and away from the hollow cavity; the top end of the base body portion is a closed end, and the closed end is provided with a cover portion for sealing the hollow cavity, and the cover portion covers the base body portion and extends away from the hollow cavity along the axial direction perpendicular to the base body portion.

[0007] The base body portion is assembled in the liquid injection hole and is in interference fit with the inner wall surface of the liquid injection hole, and the clamping jaw portion and the cover portion are respectively in abutting fit with the two side walls of the cover plate body opposite to the base body portion along the axial direction, so that the valve body is in sealed fit with the cover plate body.

[0008] The battery cover plate subassembly provided by the utility model realizes the sealing and opening of the liquid injection hole by the valve body, has good sealing effect on the liquid injection hole, can realize repeated liquid injection operation, and improves the service life of the battery; and the hollow cavity is arranged in the base body portion of the valve body, and the bottom end is an open end, so that the valve body is more convenient and labor-saving to install in the liquid injection hole.

[0009] In addition, the battery cover plate subassembly of the utility model can also have the following additional technical features:

[0010] Preferably, the base portion is provided with at least one opening communicating with the hollow cavity, each of the openings extending from the bottom end of the base portion to the top end of the base portion along the axial direction of the base portion, the length of the opening being greater than 1 / 3 of the length of the base portion and less than the length of the base portion.

[0011] Preferably, the base portion is provided with a plurality of openings, the plurality of openings being uniformly distributed circumferentially on the base portion.

[0012] Preferably, the battery cover plate assembly further comprises a sealing member, the sealing member being annular and arranged outside the side wall of the base portion, and the abutting portion of the cover portion being abutted with the cover plate body through the sealing member.

[0013] Preferably, when the abutting portion is abutted with the cover plate body through the sealing member, the sealing member is in a compressed state, and the compression amount of the sealing member along the axial direction of the base portion accounts for 20% to 50% of the thickness of the sealing member.

[0014] Preferably, the abutting portion, the base portion and the clamping portion are integrally formed.

[0015] Preferably, the upper end surface of the cover plate body is provided with a groove, the groove being arranged in communication with the liquid injection hole, and the abutting portion being at least partially fitted in the groove.

[0016] Preferably, the outer diameter of the base portion is smaller than the outer diameter of the abutting portion, the outer diameter of the abutting portion is smaller than the inner diameter of the groove, and the ratio of the outer diameter of the abutting portion to the inner diameter of the groove is 50% to 80%.

[0017] Preferably, the side end surface of the clamping portion away from the base portion is provided with a chamfer.

[0018] In a second aspect of the utility model, a battery is provided, which comprises a shell and the battery cover plate assembly of any of the embodiments of the utility model, and the shell is used for accommodating an electric core.

[0019] In a third aspect of the utility model, an electric device is provided, which comprises the battery of any of the embodiments of the utility model.

[0020] Additional aspects and advantages of the utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] Other features, objects and advantages of the application will become more apparent from the following detailed description of non-limiting embodiments made with reference to the accompanying drawings:

[0022] Figure 1 A top view of the battery cover plate assembly provided by the embodiment of the present application is shown in the following figure:

[0023] Figure 2 A sectional view of the battery cover plate assembly provided by the embodiment of the present application is shown in the following figure:

[0024] Figure 3 A sectional view of the battery cover plate assembly provided by the embodiment of the present application is shown in the following figure: Figure 2 A partial enlarged view of the middle A;

[0025] Figure 4 A partial enlarged view of the middle A; Figure 3 A structure view of the middle after removing the sealing member;

[0026] Figure 5 A perspective structure view of the valve body provided by the embodiment of the present application is shown in the following figure:

[0027] Figure 6 A sectional view of the valve body provided by the embodiment of the present application is shown in the following figure:

[0028] Figure 7 A top view of the valve body provided by the embodiment of the present application is shown in the following figure:

[0029] Figure 8 A structure view of the sealing member provided by the embodiment of the present application is shown in the following figure.

[0030] In the above figures:

[0031] 100 battery cover plate assembly; 101 cover plate body; 102 liquid injection hole; 103 groove; 104 positive pole; 105 negative pole; 106 explosion-proof valve;

[0032] 110 valve body; 111 base part; 1110 hollow cavity; 1111 opening; 112 clamping jaw part; 1121 chamfer; 113 cover part;

[0033] 120 sealing member. DETAILED DESCRIPTION

[0034] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model, and are not a limitation on the utility model. In addition, it should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings.

[0035] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0036] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting thereof. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "and / or", as used herein, refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0037] The term "comprising" is to be interpreted as open, inclusive meaning, i.e. "including but not limited to", throughout the specification and claims unless otherwise specified.

[0038] In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" are intended to indicate that the particular feature, structure, material, or characteristic following the term is included in at least one embodiment or example of the present disclosure. The repeated use of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" does not necessarily refer to the same embodiment or example. In addition, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0039] The terms "first", "second", "third", etc. are used only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0040] As Figures 1 to 8 shown, the utility model discloses a first aspect, provide a kind of battery cover plate assembly 100, comprising:

[0041] Cover plate body 101, the cover plate body 101 has injection hole 102, the injection hole 102 is through the cover plate body 101;

[0042] Valve body 110, the valve body 110 is detachably arranged in the injection hole 102, the valve body 110 includes base body portion 111, the hollow cavity 1110 in the base body portion 111 and bottom end is open end, the open end is communicated with the hollow cavity 1110 arrangement;The bottom end of the base body portion 111 is provided with the clamping jaw portion 112 along the perpendicular to the base body portion 111 axial and extends to the side away from the hollow cavity 1110, the top end of the base body portion 111 is closed end, the closed end is provided with the cover closing portion 113 that blocks the hollow cavity 1110, the cover closing portion 113 covers the base body portion 111 and extends to the side away from the hollow cavity 1110 along the perpendicular to the base body portion 111 axial and is arranged;

[0043] The base portion 111 is assembled in the liquid injection hole 102 and is in interference fit with the inner wall surface of the liquid injection hole 102, and the clamping portion 112 and the cover portion 113 are respectively in abutting fit with the two side walls of the cover plate body opposite to the base portion 111 in the axial direction, so that the valve body 110 is in sealed fit with the cover plate body 101.

[0044] Specifically, the cover plate body 101 has the liquid injection hole 102 penetrating therethrough, and electrolyte or the like can be injected into the battery through the liquid injection hole 102.

[0045] The valve body 110 can be assembled into the liquid injection hole 102 to seal the liquid injection hole 102, and can be pulled out of the liquid injection hole 102 to facilitate the electrolyte injection operation on the battery again. The valve body 110 includes a base portion 111, the inside of the base portion 111 has a hollow cavity 1110, and the bottom end of the base portion 111 has an open end in communication with the hollow cavity 1110. The hollow cavity 1110 provides a deformation space for the base portion 111 to move inward, so that the base portion 111 is easy to deform in the direction perpendicular to the axial direction of the base portion 111. The top end of the base portion 111 is a closed end, and the closed end has a cover portion 113 covering the hollow cavity 1110. The cover portion 113 covers the base portion 111 and extends along the direction perpendicular to the axial direction of the base portion 111 and away from the hollow cavity 1110. The bottom end of the base portion 111 has a clamping portion 112 extending along the direction perpendicular to the axial direction of the base portion 111 and away from the hollow cavity 1110. The clamping portion 112 is annularly distributed. When the base portion 111 is assembled into the liquid injection hole 102, the cover portion 113 and the clamping portion 112 are respectively in abutting fit with the two side walls of the cover plate body 101 opposite to the base portion 111 in the axial direction, so that the valve body 110 is in sealed fit with the cover plate body 101 at the liquid injection hole 102, and the liquid injection hole 102 is closed.

[0046] By detachably installing the valve body 110 in the liquid injection hole 102 on the cover plate body 101, during the installation of the valve body 110, the base portion 111 is inserted into the liquid injection hole 102. During the insertion of the base portion 111 into the liquid injection hole 102, the clamping portion 112 deforms towards the side close to the hollow cavity 1110, and when the clamping portion 112 moves to the bottom end of the base portion 111, the clamping portion 112 resets towards the side away from the hollow cavity 1110 after losing the binding force of the inner wall surface of the liquid injection hole 102, so that the clamping portion 112 is in abutting fit with the lower end surface of the cover plate body 101, and the cover portion 113 is in abutting fit with the upper end surface of the cover plate body 101. Thus, the liquid injection hole 102 is sealed by the valve body 110, and the valve body 110 is prevented from falling off due to excessive pressure in the battery and from sliding into the battery through the liquid injection hole 102.

[0047] In the process of disassembling the valve body 110, the base body part 111 is clamped by a clamp or manually, the clamping jaw part 112 is deformed to one side of the hollow cavity 1110, and then the clamping jaw part 112 can smoothly pass through the liquid injection hole 102 and be pulled out, the valve opening operation of the liquid injection hole 102 is realized, the secondary liquid injection is realized, and after the liquid injection is completed, the valve body 110 is inserted into the liquid injection hole 102 to realize sealing, thereby simplifying the process and improving the service life of the battery; and the hollow cavity 1110 is arranged in the base body part 111 of the valve body 110, and the bottom end is an open end, so that the valve body 110 is more convenient and labor-saving to install in the liquid injection hole 102.

[0048] The battery cover plate assembly 100 provided by the embodiment of the present application adopts the valve body 110 to replace the conventional laser welding sealing, if the amount of injected electrolyte is abnormal or unstable in the process, resulting in that the subsequent liquid retention coefficient of the battery does not meet the standard, the battery can be reworked, the valve body 110 is disassembled, the electrolyte is injected into the battery again through the liquid injection hole 102, the qualified rate of the battery is improved, the performance of the battery is ensured, and the cost is reduced.

[0049] In some embodiments, as shown in Figures 5 to 7 Each of the openings 1111 extends from the bottom end of the base body part 111 to the top end of the base body part 111 along the axial direction of the base body part 111, the length of the opening 1111 is greater than 1 / 3 of the length of the base body part 111 and less than the length of the base body part 111.

[0050] Specifically, as shown in Figure 6 The length of the base body part 111 along the axial direction thereof is m, and the length of the opening 1111 along the axial direction of the base body part 111 is greater than 1 / 3m and less than m. The length of the opening 1111 is arranged to meet the deformation requirement of the base body part 111, facilitate the installation and disassembly of the valve body 110, and not affect the sealing between the valve body 110 and the cover plate body 101. If the length of the opening 1111 is less than 1 / 3m, the deformation of the base body part 111 is too small, which is not conducive to the installation and disassembly of the base body part 111 in the liquid injection hole 102; if the length of the opening 1111 is greater than m, it is not conducive to the sealing between the valve body 110 and the cover plate body 101, and the electrolyte is prone to leak from the opening 1111. The opening 1111 can be an arc-shaped opening, a square-shaped opening, etc.

[0051] It can be understood that the clamping jaw part 112 is arranged at the bottom end of the base body part 111, and in the case that the base body part 111 has the opening 1111 at the bottom end, the clamping jaw part 112 also has the opening 1111 between the clamping jaw parts 112, so that the clamping jaw part 112 is easy to deform in the direction perpendicular to the axial direction of the base body part 111, and the installation and disassembly of the valve body 110 are facilitated.

[0052] In some embodiments, as shown in Figures 5 to 7 The plurality of openings 1111 are circumferentially and uniformly distributed on the base portion 111.

[0053] Specifically, the number of openings 1111 is 2-8, preferably 2-4, and each opening 1111 is circumferentially and uniformly distributed on the base portion 111, so that each part of the base portion 111 can be uniformly stressed, facilitating the insertion of the clamping jaw portion 112 or the secondary removal of the liquid supplement, making it easier to elastically deform into the hollow cavity 1110, and further improving the convenience of installing and dismounting the valve body 110.

[0054] In some embodiments, as shown in Figure 3 and Figure 8 The battery cover plate assembly 100 further comprises a sealing member 120, which is annular and arranged outside the side wall of the base portion 111, and the abutting portion 113 near the side wall of one side of the base portion 111 is abutted and matched with the cover plate body 101 through the sealing member 120.

[0055] Specifically, the sealing member 120 is made of rubber elastic material, such as nitrile rubber, ethylene-propylene rubber, silicone rubber, fluororubber, acrylic rubber, hydrogenated nitrile rubber, etc. The shape of the sealing member 120 matches the shape of the side wall of the base portion 111. For example, the outer periphery of the side wall of the base portion 111 is circular, and the sealing member 120 is a circular ring-shaped sealing member 120. The lower end surface of the abutting portion 113 is abutted and matched with the upper end surface of the cover plate body 101 through the sealing member 120. The arrangement of the sealing member 120 enhances the sealing performance of the valve body 110 and the cover plate body 101 at the liquid injection hole 102, i.e. even if the base portion 111 of the valve body 110 is provided with openings 1111, there will be no electrolyte leakage, etc., ensuring the sealing performance of the liquid injection port.

[0056] In some embodiments, as shown in Figure 3 When the abutting portion 113 is abutted and matched with the cover plate body 101 through the sealing member 120, the sealing member 120 is in a compressed state, and the compression amount of the sealing member 120 along the axial direction of the base portion 111 accounts for 20%-50% of the thickness of the sealing member 120.

[0057] Specifically, as shown in Figure 3As shown, the initial thickness of the sealing member 120 is d1, and when the liquid injection hole 102 is sealed, the sealing member 120 is compressed along the axial direction of the base portion 111, and the compression amount of the sealing member 120 is d2, the ratio of d2 to d1 is 20% to 50%, and preferably the ratio is 30% to 40%, that is, the thickness of the sealing member 120 after compression is d1-d2. If the compression amount of the sealing member 120 is less than 20% of the thickness of the sealing member 120, the compression amount is too small, and the sealing effect is insufficient, and if the compression amount is greater than 50%, the compression amount is too large, which is time-consuming and laborious.

[0058] In some embodiments, as shown in Figure 5 As shown, the cover portion 113, the base portion 111, and the clamping portion 112 are integrally formed.

[0059] Specifically, the valve body 110 can be made of one or more of polybutylene terephthalate (PBT), polyamide (PA), polyethylene terephthalate (PET), and other thermoplastic resins. The valve body 110 can be integrally formed by general forming processes such as injection molding, compression molding, and cutting, which is simple in processing technology and reduces the manufacturing cost of the valve body 110.

[0060] In some embodiments, as shown in Figure 3 and Figure 4 As shown, the upper end surface of the cover plate body 101 is provided with a groove 103, the groove 103 is in communication with the liquid injection hole 102, and the cover portion 113 is at least partially assembled in the groove 103.

[0061] Specifically, the groove 103 is provided to facilitate the hiding of the cover portion 113 and the sealing member 120 in the cover plate body 101, improve the aesthetics of the battery cover plate assembly 100, and provide a clamping space for disassembly of the base portion 111, facilitate clamping of the sealing member 120 from the side of the base portion 111, and the sealing member 120 is stressed and acts on the base portion 111, further deforming the clamping portion 112 perpendicular to the axial direction of the base portion 111, facilitating disassembly of the valve body 110.

[0062] In some embodiments, as shown in Figure 4 As shown, the outer diameter of the base portion 111 is smaller than the outer diameter of the cover portion 113, the outer diameter of the cover portion 113 is smaller than the inner diameter of the groove 103, and the ratio of the outer diameter of the cover portion 113 to the inner diameter of the groove 103 is 50% to 80%.

[0063] Specifically, the outer periphery of the side wall of the base portion 111 is circular, the outer diameter φ1 of the base portion 111 refers to the diameter of the circular hole corresponding to the outer side wall of the base portion 111, the outer diameter of the cover portion 113 is φ2, and the inner diameter of the groove 103 is φ3. Then φ1<φ2<φ3, so that the clamp clamps the sealing element 120 to make the base portion 111 and the claw portion 112 elastically deformed under stress, so that the claw portion 112 is disengaged from the abutting cooperation with the cover plate body 101, avoiding directly clamping the base portion 111 to cause damage to the base portion 111, and improving the service life of the valve body 110. Wherein, the ratio of φ2 and φ3 is 50%~80%, preferably the ratio is 50%~60%, if the ratio is less than 50%, the gap between the side wall of the cover portion 113 and the inner wall of the groove 103 is too small, which is not conducive to the assembly of the valve body 110 in the liquid injection hole 102; if the ratio is greater than 60%, the gap between the side wall of the cover portion 113 and the inner wall of the groove 103 is too large, which affects the appearance of the battery cover plate assembly 100, and dust and other impurities are easy to fall in the gap, which affects the performance of the battery.

[0064] It should be noted that when the liquid injection hole 102 is in a sealed state, the upper end surface of the cover portion 113 can be flush with the upper end surface of the cover plate body 101, further improving the appearance of the battery cover plate assembly 100. Wherein, the upper end surface of the cover portion 113 can be provided with a handle, etc., by pulling the handle to pull out the valve body 110 from the liquid injection hole 102, the opening of the liquid injection hole 102 is facilitated, and the secondary liquid injection is facilitated. The handle and the cover portion 113 can be fixedly connected by screwing, riveting, welding and the like.

[0065] In some embodiments, as shown in Figure 6 The side end surface of the claw portion 112 away from the base portion 111 is provided with a chamfer 1121.

[0066] Specifically, the setting of the chamfer 1121 makes the installation and disassembly of the claw portion 112 in the liquid injection hole 102 more convenient, further increasing the convenience of the installation and disassembly of the valve body 110.

[0067] As can be understood, as shown in Figure 1 and Figure 2 The cover plate body 101 is also provided with a positive pole 104, a negative pole 105, an explosion-proof valve 106 and the like.

[0068] The second aspect of the utility model provides a kind of battery, including the shell and the battery cover plate assembly 100 described in any embodiment of the application connected sealingly, the shell is used to accommodate electric core.

[0069] Specifically, the shell is sealingly connected with the battery cover plate assembly 100, and the shell is internally fitted with an electric core. The specific technical features and technical effects of the battery provided in the embodiments of the application are consistent with those of the battery cover plate assembly 100, and the embodiments of the application will not be repeated. The battery can be a lithium ion battery or the like.

[0070] In a third aspect, the utility model provides a kind of electric equipment, and the electric equipment includes the battery described in any embodiment of the application.

[0071] Specifically, the specific technical features and technical effects of the electric equipment are consistent with those of the battery cover plate assembly 100, and the embodiments of the application will not be repeated.

[0072] It should be pointed out that the electric equipment can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiments of the utility model do not make special restrictions on the above electric equipment.

[0073] The above description is only the preferred embodiments of the application and the explanation of the applied technical principles. Those skilled in the art should understand that the utility model range involved in the application is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by the above technical features or their equivalent features in any combination without departing from the utility model concept. For example, the above features are replaced with the technical features disclosed in the application (but not limited to) having similar functions to form technical solutions.

Claims

1. A battery cover plate assembly (100) characterized by, The battery cover plate assembly (100) comprises: a cover plate body (101) having a liquid injection hole (102) formed therein, the liquid injection hole (102) penetrating through the cover plate body (101); a valve body (110) detachably arranged in the liquid injection hole (102), the valve body (110) comprising a base portion (111) having a hollow cavity (1110) formed therein and an open end at a bottom end of the base portion (111), the open end being in communication with the hollow cavity (1110); the bottom end of the base portion (111) is provided with a clamping jaw portion (112) extending away from the hollow cavity (1110) along an axial direction perpendicular to the base portion (111); a top end of the base portion (111) is a closed end, and the closed end is provided with a cover portion (113) covering the base portion (111) and extending away from the hollow cavity (1110) along an axial direction perpendicular to the base portion (111); the base portion (111) is assembled in the liquid injection hole (102) and is in interference fit with an inner wall surface of the liquid injection hole (102), and the clamping jaw portion (112) and the cover portion (113) are respectively in abutting fit with two side walls of the cover plate body (101) opposite to each other along the axial direction of the base portion (111), so that the valve body (110) is in sealed fit with the cover plate body (101).

2. The battery cover plate assembly (100) of claim 1, wherein, The base portion (111) is circumferentially provided with at least one opening (1111) communicating with the hollow cavity (1110), each of the openings (1111) extends from the bottom end of the base portion (111) towards the top end of the base portion (111) along the axial direction of the base portion (111), the length of the opening (1111) is greater than 1 / 3 of the length of the base portion (111) and less than the length of the base portion (111).

3. The battery cover plate assembly (100) of claim 2, wherein, The openings (1111) are a plurality of openings (1111) circumferentially and uniformly distributed on the base portion (111).

4. The battery cover plate assembly (100) of claim 1, wherein, The battery cover plate assembly (100) further comprises a sealing member (120), the sealing member (120) is annular and arranged outside the side wall of the base portion (111), and the side wall of the base portion (111) close to the cover portion (113) is in abutting fit with the cover plate body (101) through the sealing member (120).

5. The battery cover plate assembly (100) of claim 4, wherein, When the cover portion (113) is in abutting fit with the cover plate body (101) through the sealing member (120), the sealing member (120) is in a compressed state, and the compression amount of the sealing member (120) along the axial direction of the base portion (111) accounts for 20% to 50% of the thickness of the sealing member (120).

6. The battery cover plate assembly (100) of claim 1, wherein, The cover portion (113), the base portion (111) and the clamping jaw portion (112) are integrally formed.

7. The battery cover plate assembly (100) of claim 1, wherein, The upper end surface of the cover plate body (101) is provided with a groove (103), the groove (103) is communicated with the liquid injection hole (102), and the cover part (113) is at least partially assembled in the groove (103).

8. The battery cover plate assembly (100) of claim 7, wherein, The outer diameter of the base part (111) is smaller than the outer diameter of the cover part (113), the outer diameter of the cover part (113) is smaller than the inner diameter of the groove (103), and the ratio of the outer diameter of the cover part (113) to the inner diameter of the groove (103) is 50% to 80%.

9. The battery cover plate assembly (100) of claim 1, wherein, The side end surface of the clamping jaw part (112) away from the base part (111) is provided with a chamfer (1121).

10. A battery, characterized by The battery cover plate assembly (100) as claimed in any one of claims 1-9 is sealed and connected with a shell for accommodating an electric core.

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