Cover plate assembly and battery

Abstract

The present application relates to the technical field of batteries, and discloses a cover plate assembly and a battery. The cover plate assembly comprises a base plate, a pole, a first buffer member, and a second buffer member. The pole passes through the cover plate. One end of the pole can be connected to an electrode assembly of a battery, and the other end of the pole can be connected to an external electrical device. The first buffer member is located between a first limiting surface and a first plate surface. When the pole is subjected to an acting force towards the first plate surface, the first limiting surface of the pole can act on the first buffer member, and the first buffer member can absorb the acting force of the pole towards the first plate surface, thereby preventing the first limiting surface of the pole from being damaged due to contact with the first plate surface of the base plate.

Description

Cover plate assembly and battery

[0001] The present application claims priority to the Chinese patent application No. 202411348211.4, filed on September 25, 2024, and entitled "Cover plate assembly and battery", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, and more particularly, to a cover plate assembly and a battery. BACKGROUND

[0003] As the smallest energy storage unit, the battery cell also provides the power source for tools. The battery cell structure usually includes a cover plate assembly, a shell, an insulating film and other parts. The core of the cover plate assembly is the pole, which is the interface for connecting the battery cell with external power equipment. One end of the pole is connected with the winding core, and the other end of the pole is electrically connected with the external power equipment through the cover plate.

[0004] At present, in order to ensure the connection reliability when the pole in the cover plate assembly is connected with the base plate, the pole and the cover plate are limited in the axial direction of the pole. Specifically, a structure on the pole can be provided to resist the surface of the cover plate for limiting, but such a structure will cause the pole to directly impact the cover plate when the pole is subjected to the axial force, resulting in damage to the pole and the cover plate. SUMMARY

[0005] The present application aims to provide a cover plate assembly and a battery, which solves the problem that the pole is easily damaged when subjected to the axial force in the related art.

[0006] In a first aspect, the present application provides a cover plate assembly, comprising:

[0007] a base plate having a first surface and a second surface opposite to each other;

[0008] a pole movably penetrating the base plate, the pole comprising a first limiting surface and a second limiting surface, the first limiting surface being opposite to the first surface, and the second limiting surface being opposite to the second surface;

[0009] a first buffer between the first limiting surface and the first surface;

[0010] a second buffer between the second limiting surface and the second surface;

[0011] wherein the first buffer and the second buffer are insulating material pieces.

[0012] In some embodiments, the pole column includes a first column body, a second column body and a third column body, the first column body is connected with one end of the third column body, the second column body is connected with the other end of the third column body, the outer diameter of the first column body and the outer diameter of the second column body are both greater than the outer diameter of the third column body, the first limiting surface is located on the side of the first column body facing the second column body, the second limiting surface is located on the side of the second column body facing the first column body, and the first buffer and the second buffer are both sleeved on the third column body.

[0013] In some embodiments, the first buffer and the second buffer are both limitedly matched with the substrate in the direction perpendicular to the thickness of the substrate.

[0014] In some embodiments, the first plate surface is provided with a first limiting groove, the second plate surface is provided with a second limiting groove, the first buffer includes a first limiting part, the second buffer includes a second limiting part, the first limiting part is embedded in the first limiting groove, and the second limiting part is embedded in the second limiting groove.

[0015] In some embodiments, the first buffer further includes a first insulating part, the second buffer further includes a second insulating part, the first insulating part is located between the side wall of the pole column and the substrate, and the second insulating part is located between the side wall of the pole column and the substrate.

[0016] In some embodiments, the second buffer further includes a third limiting part, the second limiting surface is provided with a third limiting groove, and the third limiting part is embedded in the third limiting groove.

[0017] In some embodiments, the cover plate assembly further includes an insulating part, and the insulating part is located between the first plate surface and the first buffer.

[0018] In some embodiments, the insulating part is provided with a fourth limiting groove, and at least part of the first buffer is embedded in the fourth limiting groove.

[0019] In some embodiments, the substrate is provided with a fifth limiting groove on the side facing the insulating part, the insulating part includes a fourth limiting part, the fourth limiting part is embedded in the fifth limiting groove, and when the first buffer is in a natural state, the fourth limiting part has a gap with the bottom wall of the fifth limiting groove.

[0020] In a second aspect, based on the above cover plate assembly, the application provides a battery including the above cover plate assembly.

[0021] The cover plate assembly provided by the application can be applied to a battery, wherein a pole is arranged through the cover plate, one end of the pole can be connected with an electrode assembly of the battery, and the other end of the pole can be connected with an external power consuming device. The first limiting surface of the pole is opposite to the first plate surface of the base plate, so that the pole can be limited by the base plate in the direction towards the first plate surface; the second limiting surface of the pole is opposite to the second plate surface of the base plate, so that the pole can be limited by the base plate in the direction towards the second plate surface, so that the pole is fixed opposite to the base plate in the axial direction. The first buffer is located between the first limiting surface and the first plate surface, when the pole is subjected to an acting force in the direction towards the first plate surface, the first limiting surface of the pole can act on the first buffer, the first buffer can absorb the acting force of the pole in the direction towards the first plate surface, and the first limiting surface of the pole and the first plate surface of the base plate are prevented from directly contacting each other and causing damage to the pole. The second buffer is located between the second limiting surface and the second plate surface, when the pole is subjected to an acting force in the direction towards the second plate surface, the second limiting surface of the pole can act on the second buffer, the second buffer can absorb the acting force of the pole in the direction towards the second plate surface, and the second limiting surface of the pole and the second plate surface of the base plate are prevented from directly contacting each other and causing damage to the pole. Thus, the cover plate assembly of the application is more safe and reliable.

[0022] The battery provided by the application applies the cover plate assembly, so that the reliability and safety of the connection between the battery and the external power consuming device are higher. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is a schematic view of the cover plate assembly of the embodiment of the application;

[0024] Fig. 2 is a schematic view of the cover plate assembly of the embodiment of the application from the top;

[0025] Fig. 3 is a schematic view of the section A-A in Fig. 2;

[0026] Fig. 4 is a schematic view of the insulating piece of the cover plate assembly of the embodiment of the application;

[0027] Fig. 5 is a schematic view of the base plate of the cover plate assembly of the embodiment of the application.

[0028] Legend: 100-base plate, 110-first plate surface, 120-second plate surface, 130-fifth limiting groove, 200-pole, 210-first column body, 211-first limiting surface, 220-second column body, 221-second limiting surface, 230-third column body, 300-first buffer, 310-first buffer part, 320-first limiting part, 330-first insulating part, 400-second buffer, 410-second buffer part, 420-second limiting part, 430-second insulating part, 440-third limiting part, 500-insulating piece, 510-fourth limiting groove, 520-fourth limiting part. DETAILED DESCRIPTION

[0029] Embodiments of the present application are described below in detail with reference to examples shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are for the purpose of explanation only, and are not to be taken as limiting of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] The battery cell, as the smallest energy storage unit, also provides the power source for the tool. The battery cell structural member usually includes a cover plate assembly, a shell, an insulating film and the like. The core of the cover plate assembly is the pole, which is the interface for connecting the battery cell with the external power consuming device. One end of the pole is connected with the winding core, and the other end of the pole is electrically connected with the external power consuming device through the cover plate.

[0032] At present, in order to ensure the connection reliability when the pole in the cover plate assembly is connected with the substrate, the pole and the cover plate are limited in cooperation in the axial direction of the pole. Specifically, a structure for resisting the plate surface of the cover plate can be arranged on the pole to limit the position, but such a structure will cause the pole to directly impact the cover plate when the pole is subjected to the axial force, resulting in damage to the pole and the cover plate.

[0033] The cover plate assembly provided in the application can be applied to a battery, wherein a pole is arranged through the cover plate, one end of the pole can be connected with an electrode assembly of the battery, and the other end of the pole can be connected with an external power consuming device. The first limiting surface of the pole is opposite to the first plate surface of the base plate, so that the pole can be limited by the base plate in the direction towards the first plate surface, and the second limiting surface of the pole is opposite to the second plate surface of the base plate, so that the pole can be limited by the base plate in the direction towards the second plate surface, so that the pole is fixed opposite to the base plate in the axial direction. The first buffer is located between the first limiting surface and the first plate surface, when the pole is subjected to an acting force in the direction towards the first plate surface, the first limiting surface of the pole can act on the first buffer, and the first buffer can absorb the acting force of the pole in the direction towards the first plate surface, so as to prevent the first limiting surface of the pole from directly contacting the first plate surface of the base plate and causing damage to the pole. The second buffer is located between the second limiting surface and the second plate surface, when the pole is subjected to an acting force in the direction towards the second plate surface, the second limiting surface of the pole can act on the second buffer, and the second buffer can absorb the acting force of the pole in the direction towards the second plate surface, so as to prevent the second limiting surface of the pole from directly contacting the second plate surface of the base plate and causing damage to the pole. Therefore, the cover plate assembly of the application is more safe and reliable.

[0034] The battery provided in the application applies the cover plate assembly described above, so that the reliability and safety of the connection between the battery and the external power consuming device are higher.

[0035] The cover plate assembly and the battery provided in the application will be described in detail below in combination with specific embodiments.

[0036] The application provides a battery, which comprises a shell, an electrode assembly and a cover plate assembly. The battery can be applied to a car as a power battery, or can be applied to other power consuming devices, and the application is not limited thereto.

[0037] The shell is the basic component of the battery of the application, and can provide a mounting base for other at least partial components of the battery and protect the other at least partial components. The shell can be made of a metal material, so that the shell has better structural strength, and thus the durability and reliability of the shell are better. The shell has a cavity, and the cavity in the shell can be used to mount other at least partial components of the battery. The electrode assembly can be arranged in the cavity of the shell, the cover plate assembly is sealed to the opening of the cavity of the shell, and the electrode assembly can be electrically connected with the cover plate assembly.

[0038] The application also provides a cover plate assembly, which can be applied to the battery described above. As shown in FIGS. 1 to 3, the cover plate assembly comprises a base plate 100, a pole 200, a first buffer 300 and a second buffer 400.

[0039] The substrate 100 is a base component of the cover assembly of the present application, and can provide a mounting base for other components of the cover assembly. The substrate 100 can be made of a metal material, so that the substrate 100 has better structural strength, and thus the durability and reliability of the substrate 100 are better. The substrate 100 can be arranged at the opening of the cavity of the housing, and seal the opening of the cavity, so that the electrode assembly in the housing can be enclosed in the cavity of the housing, and thus the electrode assembly is protected.

[0040] The pole 200 is arranged through the substrate 100, one end of the pole 200 extends into the cavity of the housing and is connected with the electrode assembly, and the other end of the pole 200 extends out of the substrate 100 and is connected with an external electrical connection device, so that the electrode assembly can be connected with the external electrical connection device, and the charging and discharging function is realized.

[0041] The substrate 100 has a first plate surface 110 and a second plate surface 120, and the first plate surface 110 and the second plate surface 120 are opposite plate surfaces of the substrate 100 in the thickness direction of the substrate 100. The pole 200 has a first limiting surface 211 and a second limiting surface 221, and the first limiting surface 211 of the pole 200 is opposite to the first plate surface 110 of the substrate 100. When the pole 200 is subjected to a force towards the first plate surface 110 of the substrate 100, the first limiting surface 211 of the pole 200 and the first plate surface 110 of the substrate 100 can limit each other, so that the pole 200 cannot move in the direction towards the first plate surface 110 of the substrate 100, and the pole 200 and the substrate 100 can be limited and matched in the direction towards the first plate surface 110. The second limiting surface 221 of the pole 200 is opposite to the second plate surface 120 of the substrate 100. When the pole 200 is subjected to a force towards the second plate surface 120 of the substrate 100, the second limiting surface 221 of the pole 200 and the second plate surface 120 of the substrate 100 can limit each other, so that the pole 200 cannot move in the direction towards the second plate surface 120 of the substrate 100, and the pole 200 and the substrate 100 can be limited and matched in the direction towards the second plate surface 120. Thus, the pole 200 can be limited and matched with the substrate 100 in the positive and negative directions of the axial direction of the pole 200 to be fixed.

[0042] The first buffer 300 is located between the first limiting surface 211 of the pole 200 and the first plate surface 110 of the base plate 100, so that the first buffer 300 is fixed by being sandwiched by the pole 200 and the base plate 100. The first buffer 300 is a flexible structural member which can deform to absorb external force when subjected to the external force. When the pole 200 is subjected to a force towards the first plate surface 110 of the base plate 100, the first limiting surface 211 of the pole 200 can press the first buffer 300, and the first buffer 300 can absorb the impact force of the pole 200, so that the first limiting surface 211 of the pole 200 does not directly collide with the first plate surface 110 of the base plate 100, thereby avoiding damage to the pole 200 and the base plate 100 due to collision, so as to achieve the purpose of protecting the pole 200 and the base plate 100.

[0043] The second buffer 400 is located between the second limiting surface 221 of the pole 200 and the second plate surface 120 of the base plate 100, so that the second buffer 400 is fixed by being sandwiched by the pole 200 and the base plate 100. The second buffer 400 is a flexible structural member which can deform to absorb external force when subjected to the external force. When the pole 200 is subjected to a force towards the second plate surface 120 of the base plate 100, the second limiting surface 221 of the pole 200 can press the second buffer 400, and the second buffer 400 can absorb the impact force of the pole 200, so that the second limiting surface 221 of the pole 200 does not directly collide with the second plate surface 120 of the base plate 100, thereby avoiding damage to the pole 200 and the base plate 100 due to collision, so as to achieve the purpose of protecting the pole 200 and the base plate 100.

[0044] The first buffer 300 and the second buffer 400 can also specifically be elastic structural members, so that when the pole 200 is no longer subjected to a force in the axial direction, the elastic restoring force of the first buffer 300 or the second buffer 400 can drive the pole 200 to reset.

[0045] In some embodiments, referring to FIGS. 1-3, the pole 200 can be provided with a first pole body 210, a second pole body 220, and a third pole body 230, the first pole body 210 being connected to one end of the third pole body 230, and the second pole body 220 being connected to the other end of the third pole body 230, such that the first pole body 210 and the second pole body 220 are arranged at two ends of the third pole body 230. The third pole body 230 is arranged in the substrate 100, the first pole body 210 has an outer diameter greater than that of the third pole body 230, so that a stepped surface is formed at the connection between the first pole body 210 and the third pole body 230, which is a first limiting surface 211 of the pole 200. The first limiting surface 211 is opposite to the first plate surface 110 of the substrate 100, so that the first pole body 210 is limited in cooperation with the substrate 100 in the direction towards the first plate surface 110. The second pole body 220 has an outer diameter greater than that of the third pole body 230, so that a stepped surface is formed at the connection between the second pole body 220 and the third pole body 230, which is a second limiting surface 221 of the pole 200. The second limiting surface 221 is opposite to the second plate surface 120 of the substrate 100, so that the second pole body 220 is limited in cooperation with the substrate 100 in the direction towards the second plate surface 120.

[0046] The first buffer 300 can be sleeved on the third pole body 230, so that the third pole body 230 limits the first buffer 300, and the first buffer 300 is fixed relative to the third pole body 230 in the radial direction of the third pole body 230. Specifically, the first buffer 300 can be provided with a first through hole for the third pole body 230 to pass through, and the inner diameter of the first through hole is slightly greater than the outer diameter of the third pole body 230, so that the first buffer 300 can be easily sleeved on the third pole body 230. In addition, when the pole 200 moves in the axial direction under the action of an external force, the pole 200 and the first buffer 300 do not rub with each other in the axial direction, so that the first buffer 300 is prevented from being damaged by friction.

[0047] The second buffer 400 can be sleeved on the third pole body 230, so that the third pole body 230 limits the second buffer 400, and the second buffer 400 is fixed relative to the third pole body 230 in the radial direction of the third pole body 230. Specifically, the second buffer 400 can be provided with a second through hole for the third pole body 230 to pass through, and the inner diameter of the second through hole is slightly greater than the outer diameter of the third pole body 230, so that the second buffer 400 can be easily sleeved on the third pole body 230. In addition, when the pole 200 moves in the axial direction under the action of an external force, the pole 200 and the second buffer 400 do not rub with each other in the axial direction, so that the second buffer 400 is prevented from being damaged by friction.

[0048] In some embodiments, referring to FIGS. 1-3, the first buffer 300 in the present application is in limit position cooperation with the substrate 100 in the direction perpendicular to the thickness of the substrate 100, so as to prevent the first buffer 300 from moving in the direction perpendicular to the thickness of the substrate 100, i.e. horizontally, to ensure that the first buffer 300 is always between the first plate surface 110 of the substrate 100 and the first limit surface 211 of the first buffer 300.

[0049] Specifically, the substrate 100 can be provided with a first limit slot on the first plate surface 110, and the slot opening of the first limit slot can be arranged to face the first limit surface 211 of the first pole 200. The first buffer 300 includes a first buffer portion 310 and a first limit portion 320. The first buffer portion 310 is clamped between the first limit surface 211 and the first plate surface 110, and the first limit surface 211 and the second limit surface 221 are located on opposite sides of the first buffer portion 310. The first limit portion 320 is located on the first limit surface 211 of the first buffer portion 310 facing the first plate surface 110. The first limit portion 320 can be embedded in the first limit slot, and the two side walls of the first limit slot can limit the first limit portion 320 in the direction perpendicular to the thickness of the substrate 100, thereby limiting the first buffer 300, so that the first buffer 300 can be more stably arranged between the first plate surface 110 and the first limit surface 211.

[0050] The second buffer 400 in the present application is in limit position cooperation with the substrate 100 in the direction perpendicular to the thickness of the substrate 100, so as to prevent the second buffer 400 from moving in the direction perpendicular to the thickness of the substrate 100, i.e. horizontally, to ensure that the second buffer 400 is always between the second plate surface 120 of the substrate 100 and the second limit surface 221 of the second buffer 400.

[0051] Specifically, the substrate 100 can be provided with a second limit slot on the second plate surface 120, and the slot opening of the second limit slot can be arranged to face the second limit surface 221 of the second pole 200. The second buffer 400 includes a second buffer portion 410 and a second limit portion 420. The second buffer portion 410 is clamped between the second limit surface 221 and the second plate surface 120, and the second limit surface 221 and the second limit surface 221 are located on opposite sides of the second buffer portion 410. The second limit portion 420 is located on the second limit surface 221 of the second buffer portion 410 facing the second plate surface 120. The second limit portion 420 can be embedded in the second limit slot, and the two side walls of the second limit slot can limit the second limit portion 420 in the direction perpendicular to the thickness of the substrate 100, thereby limiting the second buffer 400, so that the second buffer 400 can be more stably arranged between the second plate surface 120 and the second limit surface 221.

[0052] In some embodiments, referring to FIGS. 1-3, the first buffer 300 of the application can further comprise a first insulation portion 330 connected to the first buffer portion 310, the first insulation portion 330 being located between the side wall of the pole 200 and the substrate 100, and the first insulation portion 330 separating the side wall of the pole 200 from the substrate 100. Specifically, the first insulation portion 330 is located between the side wall of the third pole 230 and the substrate 100, and the first insulation portion 330 can prevent the third pole 230 from directly contacting the substrate 100 and causing a short circuit of the battery.

[0053] The second buffer 400 of the application can further comprise a second insulation portion 430 connected to the second buffer portion 410, the second insulation portion 430 being located between the side wall of the pole 200 and the substrate 100, and the second insulation portion 430 separating the side wall of the pole 200 from the substrate 100. Specifically, the second insulation portion 430 is located between the side wall of the third pole 230 and the substrate 100, and the second insulation portion 430 can prevent the third pole 230 from directly contacting the substrate 100 and causing a short circuit of the battery.

[0054] In some embodiments, the second buffer 400 of the application can further comprise a third limiting portion 440 located on the side of the second buffer portion 410 opposite to the second limiting portion 420, a third limiting groove can be formed on the second limiting surface 221 of the pole 200, and the second limiting portion 420 can be embedded in the third limiting groove. The opposite inner walls of the third limiting groove can limit the third limiting portion 440 in the radial direction of the pole 200, so that the second buffer 400 and the pole 200 are limited in the direction perpendicular to the thickness of the substrate 100, to further improve the stability of the second buffer 400.

[0055] In some embodiments, referring to FIGS. 1-4, the cover assembly of the application can further comprise a first insulation member 500. The first insulation member 500 is located between the first buffer 300 and the first limiting surface 211 of the pole 200. The first insulation member 500 separates the first buffer 300 from the pole 200, further ensuring that the pole 200 will not directly contact the substrate 100 and cause a short circuit of the battery. The first insulation member 500 can be provided with a fourth limiting groove 510, and part of the first pole 210 of the pole 200 is embedded in the fourth limiting groove 510 of the first insulation member 500, so that the first insulation member 500 and the first pole 210 can be relatively fixed. Specifically, the fourth limiting groove 510 is located on the end side of the first insulation member 500 facing the first pole 210, and the first insulation member 500 can surround part of the first pole 210.

[0056] In some embodiments, referring to FIGS. 3-5, the substrate 100 can be provided with a fifth limiting slot 130 on the side of the substrate 100 facing the insulating member 500. The insulating member 500 can be provided with a fourth limiting portion 520 on the side of the insulating member 500 facing the substrate 100. The fourth limiting portion 520 can be embedded in the fifth limiting slot 130. In this way, the insulating member 500 and the substrate 100 can be limited in the direction perpendicular to the thickness of the substrate 100. When the first buffer member 300 is in a natural state, i.e., the pole 200 has not yet been subjected to an axial force from the first plate surface 110 of the substrate 100, the fourth limiting portion 520 has a spacing from the bottom wall of the fifth limiting slot 130. Thus, when the pole 200 is subjected to a force from the first plate surface 110 and moves toward the first plate surface 110, the fourth limiting portion 520 can move toward the bottom wall of the fifth limiting slot 130, thereby avoiding interference between the insulating member 500 and the substrate 100, which can prevent the pole 200 from moving.

[0057] The number of fifth limiting slots 130 can be multiple, and the number of fourth limiting portions 520 can also be multiple, thereby achieving better limiting and fixing effect of the substrate 100 and the insulating member 500.

[0058] In the description of the present specification, the description referring to the terms "embodiment", "example", and the like means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements, and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A cover assembly, characterized by The utility model relates to a cover plate assembly of a battery, including: a substrate (100) having a first plate surface (110) and a second plate surface (120) opposite to each other; a pole (200) movably penetrating the substrate (100), the pole (200) comprising a first limiting surface (211) opposite to the first plate surface (110) and a second limiting surface (221) opposite to the second plate surface (120); a first buffer (300) between the first limiting surface (211) and the first plate surface (110); a second buffer (400) between the second limiting surface (221) and the second plate surface (120); wherein the first buffer (300) and the second buffer (400) are made of insulating material.

2. The cover plate assembly of claim 1, wherein, The pole (200) comprises a first column (210), a second column (220) and a third column (230), one end of the first column (210) is connected to the third column (230), the other end of the second column (220) is connected to the third column (230), the outer diameter of the first column (210) and the outer diameter of the second column (220) are both greater than the outer diameter of the third column (230), the first limiting surface (211) is located on one side of the first column (210) facing the second column (220), the second limiting surface (221) is located on one side of the second column (220) facing the first column (210), the first buffer (300) and the second buffer (400) are both sleeved on the third column (230).

3. The cover plate assembly of claim 1, wherein, The first buffer (300) and the second buffer (400) are both limited in cooperation with the substrate (100) in a direction perpendicular to the thickness of the substrate (100).

4. The cover plate assembly of claim 3, wherein, A first limiting groove is formed on the first plate surface (110), a second limiting groove is formed on the second plate surface (120), the first buffer (300) comprises a first limiting part (320), the second buffer (400) comprises a second limiting part (420), the first limiting part (320) is embedded in the first limiting groove, and the second limiting part (420) is embedded in the second limiting groove.

5. The cover plate assembly of claim 3, wherein, The first buffer (300) further comprises a first insulating part (330), the second buffer (400) further comprises a second insulating part (430), the first insulating part (330) is located between the sidewall of the pole (200) and the substrate (100), and the second insulating part (430) is located between the sidewall of the pole (200) and the substrate (100).

6. The cover plate assembly of claim 1, wherein, The second buffer (400) further comprises a third limiting part (440), the second limiting surface (221) is provided with a third limiting groove, and the third limiting part (440) is embedded in the third limiting groove.

7. The cover plate assembly of any one of claims 1-6, wherein, The cover plate assembly further comprises an insulating part (500) between the first plate surface (110) and the first buffer (300).

8. The cover plate assembly of claim 7, wherein, The insulating piece (500) is provided with a fourth limiting groove (510), and at least part of the first buffer piece (300) is embedded in the fourth limiting groove (510).

9. The cover plate assembly of claim 8, wherein, The substrate (100) is provided with a fifth limiting groove (130) on one side facing the insulating piece (500), the insulating piece (500) comprises a fourth limiting portion (520), the fourth limiting portion (520) is embedded in the fifth limiting groove (130), and when the first buffer piece (300) is in a natural state, the fourth limiting portion (520) has a gap with a bottom wall of the fifth limiting groove (130).

10. A battery, characterized by A cover plate assembly as claimed in any one of claims 1-9.

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