Cover plate assembly, battery and electric device

Abstract

The invention provides a cover plate assembly, a battery and a power utilization device. A cover plate body is provided with a mounting hole penetrating through the thickness direction of the cover plate body; the electrode terminal is arranged in the mounting hole, a first connecting part of the electrode terminal is arranged on one side of the cover plate body and covers the mounting hole, and a second connecting part penetrates through the mounting hole and extends towards the other side of the cover plate body; the connecting piece is arranged on the other side, opposite to the first connecting part, of the cover plate body, the second connecting part sleeves the connecting piece and is connected with the connecting piece, the side face, close to the cover plate body, of the connecting piece is provided with a guide piece protruding out of the side face, and the guide piece is close to the second connecting part; the sealing piece comprises a first sealing part and a second sealing part, the first sealing part is arranged between the first connecting part and the cover plate body in a pressed mode in the axial direction of the mounting hole, and at least part of the side face of the guiding piece abuts against the second sealing part and enables part of the second sealing part to be bent and arranged between the connecting piece and the cover plate body in a pressed mode. Therefore, the sealing element of the cover plate assembly can realize double-layer sealing, so that the sealing property of the post terminal is prevented from being damaged due to external force.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a cover plate assembly, a battery, and an electrical device. Background Art

[0002] With the increasing development of electronic products, batteries are used more and more widely. As an important part of the battery, the battery cover plate has the most complex structure. The sealing performance of the cover plate mainly depends on the sealing ring. The sealing ring can seal the inside of the battery, prevent internal leakage of the battery, ensure the service life of the battery, and also provide guarantee for the safety of the battery. Usually, the sealing ring is annular, its cross-section is rectangular, and it is arranged at the upper part inside the cover plate and laid flat on the surface of the pole column. The sealing ring of this structure mainly relies on being connected with the insulating plastic ring after injection molding to perform airtight sealing on the pole column. Since the compression rate of the sealing ring towards the pole column direction cannot be guaranteed, the sealing performance is weak. When the cover plate is subjected to pushing and pulling forces and the sealing ring is subjected to forces, the pole column will sink or rise, resulting in a change in the compression rate of the sealing ring, and there are situations such as insufficient compression rate of the sealing ring, air leakage, liquid leakage, and corrosion.

[0003] Therefore, how to improve the sealing performance between the cover plate and the pole column when the pole column is subjected to external forces is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In view of this, the present application provides a cover plate assembly, a battery, and an electrical device, which solve the technical problem of poor sealing performance of the sealing ring when the pole column is subjected to external forces.

[0005] In order to achieve the above object, the present application provides the following technical solutions:

[0006] A cover plate assembly, comprising:

[0007] A cover plate body having an installation hole penetrating in its thickness direction;

[0008] An electrode terminal disposed in the installation hole, the electrode terminal including a first connection portion and a second connection portion, the first connection portion being disposed on one side of the cover plate body and covering the installation hole, and the second connection portion passing through the installation hole and extending towards the other side of the cover plate body;

[0009] A connecting member disposed on the other side of the cover plate body relative to the first connection portion, the second connection portion being sleeved on the connecting member and connected to the connecting member, a guiding member protruding from the side surface of the connecting member close to the cover plate body and the guiding member being disposed close to the second connection portion;

[0010] The seal includes a first seal part and a second seal part connected to each other. Along the axial direction of the mounting hole, the first seal part is pressed between the first connecting part and the cover plate body, and at least part of the side surface of the guiding part abuts against the second seal part and bends part of the second seal part to be pressed between the connecting part and the cover plate body.

[0011] Optionally, in the above cover plate assembly, at least part of the side surface of the guiding part that abuts against the second seal part is an inclined surface, and along the axial direction of the connecting part, the inclined surface inclines from near the second connecting part to a direction away from the second connecting part.

[0012] Optionally, in the above cover plate assembly, the second seal part includes a body part and a bent part, and the body part is connected between the first connecting part and the bent part;

[0013] Wherein, in the first state, along the radial direction of the seal, the outer peripheral surfaces of the body part and the bent part are flush with each other, and the inner peripheral surface of the body part is closer to the central axis of the seal than the inner peripheral surface of the bent part; the inclined surface of the guiding part abuts against the inner peripheral surface of the bent part.

[0014] Optionally, in the above cover plate assembly, along the radial direction of the seal, the inner peripheral surface of the body part is flush with the inner peripheral surface of the first seal part.

[0015] Optionally, in the above cover plate assembly, the compression rate of the bent part in its thickness direction is greater than or equal to 25% and less than or equal to 50%;

[0016] And / or, the compression rate of the first seal part in its thickness is greater than or equal to 25% and less than or equal to 50%.

[0017] Optionally, in the above cover plate assembly, the included angle between the inclined surface and the vertical direction is α, satisfying: 15° ≤ α ≤ 45°.

[0018] Optionally, in the above cover plate assembly, a weld seam is formed on the connection surface between the connecting part and the second connecting part.

[0019] Optionally, in the above cover plate assembly, it further includes:

[0020] A first insulating part, arranged between the connecting part and the cover plate body;

[0021] A second insulating part, arranged on the surface of the cover plate body facing away from the first insulating part.

[0022] A battery includes the above cover plate assembly.

[0023] An electrical device includes the above battery.

[0024] The second sealing portion of the seal of the cover plate assembly provided by the present application can be bent and pressed between the connecting member and the cover plate body under the guiding action of the guiding member, and the first sealing portion is pressed between the first connecting portion and the cover plate body. It is equivalent to having two sealing members along the thickness direction of the cover plate assembly. The two sealing members can compress and seal at two positions. When the electrode terminal is subjected to a downward thrust from above and the position of the cover plate body remains unchanged, the compression rate of the first sealing portion will become smaller, and due to the action of the guiding member, the second sealing portion will be pressed tighter instead, and the compression rate will become larger. Similarly, when the electrode terminal is subjected to an upward force from below, the compression rate of the first sealing portion will become larger. No matter which direction the electrode terminal is stressed, the compression rate of a part of the seal can ensure airtightness, and it can solve the problems of insufficient compression rate of the seal and leakage of gas and liquid when the electrode terminal is affected by external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0026] Figure 1 An exploded view of the cover plate provided by the embodiment of the present application;

[0027] Figure 2 A top view of the cover plate provided by the embodiment of the present application;

[0028] Figure 3 For Figure 2 The sectional view taken along A-A in

[0029] Figure 4 For Figure 3 The partial enlarged view in

[0030] Figure 5 For Figure 4 The partial enlarged view in

[0031] Figure 6 A structural schematic diagram of the cover plate assembly provided by the embodiment of the present application;

[0032] Figure 7 An axial sectional view of the cover plate assembly provided by the embodiment of the present application;

[0033] Figure 8 A structural schematic diagram of the welding block provided by the embodiment of the present application.

[0034] Wherein:

[0035] 1. Cover plate body; 11. Mounting hole;

[0036] 2. Electrode terminal; 21. First connection part; 22. Second connection part;

[0037] 3. Connector; 31. Guide part; 311. Inclined surface;

[0038] 4. Sealing member; 41. First sealing part; 42. Second sealing part; 421. Bending part; 422. Body part; 423. Step; 5. Weld seam; 6. First insulating member; 7. Second insulating member. Detailed implementation manner

[0039] The present application provides a cover plate assembly.

[0040] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0041] As Figures 1 - 8 shown, the embodiment of the present application provides a cover plate assembly, which can improve the sealing performance when the electrode terminal is subjected to an external force.

[0042] First of all, the cover plate assembly includes a cover plate body 1, an electrode terminal 2, a connector 3 and a sealing member 4. Among them, the cover plate body 1 has a mounting hole 11 penetrating in its thickness direction; the electrode terminal 2 is arranged in the mounting hole 11. The electrode terminal 2 includes a first connection part 21 and a second connection part 22. The first connection part 21 is arranged on one side of the cover plate body 1 and covers the mounting hole 11, and the second connection part 22 passes through the mounting hole 11 and extends towards the other side of the cover plate body 1; the connector 3 is arranged on the other side of the cover plate body 1 relative to the first connection part 21. The second connection part 22 is sleeved on the connector 3 and connected to the connector 3. A guide part 31 protruding from the side surface is arranged on the side surface of the connector 3 close to the cover plate body 1, and the guide part 31 is arranged close to the second connection part 22; the sealing member 4 includes a connected first sealing part 41 and a second sealing part 42. Along the axial direction of the mounting hole 11, the first sealing part 41 is pressed between the first connection part 21 and the cover plate body 1, and at least part of the side surface of the guide part 31 abuts against the second sealing part 42 and bends part of the second sealing part 42 to be pressed between the connector 3 and the cover plate body 1.

[0043] In the cover plate assembly provided by the present application, the second sealing portion 42 of the seal 4 can be bent and pressed between the connecting member 3 and the cover plate body 1 under the guiding action of the guiding member 31, and the first sealing portion 41 is pressed between the first connecting portion 21 and the cover plate body 1. It is equivalent to having two sealing members along the thickness direction of the cover plate assembly. The two sealing members can compress and seal at two positions. When the electrode terminal 2 is subjected to a downward thrust, the position of the cover plate body 1 remains unchanged, and the compression rate of the first sealing portion 41 will become smaller. However, due to the action of the guiding member 31, the second sealing portion 42 will be pressed tighter instead, and the compression rate will become larger. Similarly, when the electrode terminal 2 is subjected to an upward force from below, the compression rate of the first sealing portion 41 will become larger. No matter in which direction the electrode terminal is stressed, the compression rate of a part of the seal 4 can ensure airtightness, and it can solve the problems of insufficient compression rate of the seal due to external force on the electrode terminal, air leakage, liquid leakage, etc.

[0044] It should be noted that in the assembled cover plate assembly, when the electrode terminal 2 is stressed, the first sealing portion 41 is subjected to a force along its thickness direction, and the second sealing portion 42 pressed between the connecting member 3 and the cover plate body 1 is subjected to a force along its thickness direction. And part of the second sealing portion 42 is bent under the action of the guiding member 31. Therefore, there is an elastic force at the bending position of the second sealing portion 42 to restore itself to the unbent state. This elastic force can act on the adjacent electrode terminal 2 and the connecting member 3, and can increase the sealing performance of the connection between the second connecting portion 22, the connecting member 3 and the second sealing portion 42; especially when the electrode terminal 2 is subjected to an upward thrust from below, the compression rate of the first sealing portion 42 will become larger, and the compression rate of the bent second sealing portion 42 will become smaller. However, due to the action of this elastic force, the bent second sealing portion 42 can always abut against the guiding member 31 of the connecting member 3, so that the sealing performance is maintained effectively. Compared with the structure that simply sets two sealing layers, its sealing performance is better. And because the second sealing portion 42 can be partially bent, it can be applied to batteries with different heights of electrode terminals 2, and its adaptability is stronger.

[0045] During specific implementation, see Figure 8 , at least part of the side surface of the guiding member 31 abutting against the second sealing portion 42 is an inclined surface 311. Along the axial direction of the connecting member 3, the inclined surface 311 inclines from near the second connecting portion 22 to away from the second connecting portion 22. In some embodiments, the inner side surface of the guiding member 31 can be attached to the second connecting portion 22. It should be noted that the guiding member 31 can be an annular member, or a plurality of guiding members 31 can be evenly spaced along the circumferential direction of the connecting member 3.

[0046] During the assembly process of the cover plate assembly, the inclined surface 311 of the guide member 31 plays a huge role. When the connecting member 3 is assembled with the second connecting portion 22, the inclined surface 311 can effectively guide the bending of the second sealing portion 42 of the seal 4, causing it to bend along a predetermined trajectory and manner. The guide member 31 guides the direction of the seal 4, avoiding the sealing failure problem caused by the offset of the second sealing portion 42 of the seal 4. At the same time, the design of the inclined surface 311 can also relieve the pressure between the connecting member 3 and the second connecting portion 22 to a certain extent. When relative movement occurs between the two, the inclined surface 311 can evenly disperse the pressure, reducing the situation of excessive local pressure, thereby extending the service life of the seal 4 and the connecting member 3.

[0047] During specific implementation, see Figure 6 and Figure 7, the second sealing portion 42 includes a body portion 422 and a bent portion 421. The body portion 422 is connected between the first connecting portion 21 and the bent portion 421. Wherein, in the first state (the state where the bent portion 421 is not bent relative to the body portion 422), along the radial direction of the seal 4, the outer peripheral surfaces of the body portion 422 and the bent portion 421 are flush. The inner peripheral surface of the body portion 422 is closer to the central axis of the seal 4 than the inner peripheral surface of the bent portion 421. A step 423 is formed at the inner peripheral connection position of the bent portion 421 and the body portion 422, that is, the wall thickness of the bent portion 421 is smaller than the wall thickness of the body portion 422, which is beneficial to the bending of the bent portion 421 relative to the body portion 422. And when the seal 4 is initially sleeved on the electrode terminal 2 and the bent portion 421 has not been bent yet, the position of the step 423 can make there be a gap between the inner wall of the bent portion 421 and the outer wall of the second connecting portion 22, facilitating the guiding member 31 to apply an external force to the bent portion 421 to start bending; the inclined surface 311 of the guiding member 31 abuts against the inner peripheral surface of the bent portion 421. After the bent portion 421 is bent under force, a chamfer is formed at the connection position of the bent portion 421 and the body portion 422, and the inclined surface 311 of the guiding member 31 abuts against the chamfer. The design of the chamfer helps to make the pressure distribute more evenly at the connection. The chamfer can avoid the occurrence of stress concentration phenomenon, enable the contact between the seal 4 and the electrode terminal 2 to be closer and more uniform, thereby improving the sealing reliability and reducing the possibility of leakage. And during the actual use process, the seal 4 may undergo certain deformation due to factors such as temperature change and pressure fluctuation. The chamfer can provide a certain buffer space for this kind of deformation, enabling the seal 4 to better adapt to these changes and maintain a good sealing effect. It should be noted that the inner peripheral surface of the body portion 422 can also be flush with the inner peripheral surface of the bent portion 421; or, the inner peripheral surface of the body portion 422 is farther from the central axis of the seal 4 than the inner peripheral surface of the bent portion 421. In addition, the outer peripheral surfaces of the body portion 422 and the bent portion are not limited to the flush structure. As long as the wall thickness and the relative position relationship of the bent portion 421 and the body portion 422 can meet the requirement that the bent portion 421 can be bent relative to the body portion 422 and no breakage occurs at their connection position.

[0048] During specific implementation, along the radial direction of the seal 4, the inner peripheral surface of the body portion 422 is flush with the inner peripheral surface of the first sealing portion 41. It is convenient for the second connecting portion 22 of the electrode terminal 2 to pass through the first sealing portion 41 and the body portion 422, and the inner peripheral surface of the first sealing portion 41 is in contact with the outer wall surface of the second connecting portion 22, and the body portion 422 is in contact with the outer wall surface of the second connecting portion 22, realizing the sealing performance of the first sealing portion 41 and the body portion 422.

[0049] During specific implementation, see in detail Figure 5 and Figure 6After that, the compression rate of the bending part 421 in its thickness direction is greater than or equal to 25% and less than or equal to 50%. The thickness of the bending part 421 before compression is a1, the thickness after compression is a2, and the compression rate is Satisfy: It should be noted that the compression rate of the bending part 421 can be any one of 25%, 26%, 27%, 28%, 29%, 30%, 35%, 40%, 45%, 50%; and / or, the compression rate of the first sealing part 41 along its thickness is greater than or equal to 25% and less than or equal to 50%. The thickness of the first sealing part 41 before compression is b1, the thickness after compression is b2, and the compression rate is Satisfy: It should be noted that the compression rate of the first sealing part 41 can be any one of 25%, 26%, 27%, 28%, 29%, 30%, 35%, 40%, 45%, 50%.

[0050] The test results of the compression rate and sealing performance of the bending part 421 of the assembled cover plate assembly are shown in Table 1 below:

[0051] Table 1

[0052]

[0053] The test results of the compression rate and sealing performance of the first sealing part 41 of the assembled cover plate assembly are shown in Table 2 below:

[0054] Table 2

[0055]

[0056] It can be seen from Table 1 and Table 2 that controlling the size of the compression rate can not only avoid the situation that the compression rate of the seal 4 is insufficient due to too small compression rate, resulting in the risk of air leakage of the cover plate, but also avoid the situation that the aging resistance of the seal 4 is poor due to too large compression rate, and the seal 4 is prone to irreversible permanent collapse, affecting the airtightness in the later stage.

[0057] In specific implementation, the compression rate of the first sealing part 41 of the seal 4 is 0.3, and the compression rate of the bending part 421 is 0.3; in the comparative example, a single-layer seal 4 is used and is arranged at the position of the first sealing part 41 in the present application (that is, the single-layer seal 4 is arranged between the first connecting part 21 and the cover plate body 1). The comparative example is the same as the present application in other structures except for the seal 4. With the cover plate body 1 fixed, push the electrode terminal 2 from top to bottom (that is, the top of the electrode terminal 2 is subjected to a thrust) to generate a displacement. The test results of the displacement amount and detecting the airtightness of the cover plate (requiring a helium leak detection value < 1.0*10 -7 Pa·m3 / s) are shown in Table 3:

[0058] Table 3

[0059] Examples / Comparative Examples Displacement magnitude / mm Helium leak detection value / Pa.m3 / s Judgment Example 1 0.5 <![CDATA[2.3*10 -10 > OK Example 2 1 <![CDATA[3.7*10 -10 > OK Example 3 1.5 <![CDATA[5.1*10 -10 > OK Example 4 2 <![CDATA[1.9*10 -9 > OK Example 5 2.5 <![CDATA[3.0*10 -9 > OK Example 6 3 <![CDATA[9.1*10 -10 > OK Example 7 3.5 <![CDATA[6.6*10 -9 > OK Example 8 4 <![CDATA[2.8*10 -9 > OK Example 9 5 <![CDATA[3.7*10 -8 > OK Example 9 10 <![CDATA[6.1*10 -8 > OK Example 10 15 <![CDATA[9.1*10 -8 > OK Comparative Example 1 0.5 <![CDATA[5.5*10 -9 > OK Comparative Example 2 1.5 <![CDATA[8.2*10 -9 > OK Comparative Example 3 2.5 <![CDATA[9.9*10 -9 > OK Comparative Example 4 3 <![CDATA[6.7*10 -8 > OK Comparative Example 5 5 <![CDATA[6.3*10 -6 > NG

[0060] As can be seen from Table 3, under the same thrust stroke, the helium leak detection value of the present application is lower and the airtightness is better. In addition, even when the thrust displacement of the present application reaches 15 mm, the airtightness can still meet the requirements; while in the comparative example, when the thrust stroke is 5 mm, the helium leak detection fails. Compared with Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4, the sealing performance of the seal 4 in the embodiment of the present application is better, significantly improving the ability of the cover plate to withstand external forces.

[0061] During specific implementation, the included angle between the inclined surface 311 and the vertical direction is α, satisfying: 15° ≤ α ≤ 45°. It should be noted that α can be any one of 15%, 20%, 25%, 30%, 35%, 40%, and 45%. In addition, the inclined surface 311 can be linear or arc-shaped. When the inclined surface 311 is arc-shaped, the arc can be convex or concave.

[0062] The test results of the specific value of α of the assembled guide member 31 and the guiding effect on the bending of the second sealing portion 42 of the cover plate assembly are shown in Table 4 below:

[0063] Table 4

[0064]

[0065] As can be seen from Table 4, controlling the size of α can not only avoid the situation where the guiding effect of the guide member 31 on the bending of the second sealing portion 42 is poor, the seal 4 is not bent sufficiently, and the strength of the guide member 31 is insufficient due to too small an angle, but also avoid the situation where the guiding effect is poor, the seal 4 is not bent sufficiently or even the seal 4 cannot be bent and accumulates downward due to too large an angle.

[0066] During specific implementation, a weld seam 5 is formed on the connection surface between the connecting member 3 and the second connecting portion 22. The penetration depth of the weld seam 55 is c, where 0.3 mm ≤ c ≤ 2 mm. It should be noted that c can be any one of 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.5 mm, 2.0 mm. When the penetration depth c reaches 0.3 mm or more, sufficient metallurgical bonding can be formed between the connecting member 3 and the electrode terminal 2, ensuring a certain connection strength between the two. When the cover plate is subjected to various external forces, such as vibration, tension, and extrusion. Sufficient penetration depth can firmly connect the connecting member 3 and the electrode terminal 2 together, preventing them from separating under these external forces and ensuring the stability and reliability of the entire cover plate structure. During the installation and use of the battery, the cover plate needs to withstand a certain amount of mechanical stress, and an appropriate penetration depth can ensure that the welded part will not break easily, thus maintaining the normal operation of the battery. If the penetration depth c exceeds 2 mm, although it may increase the connection strength to a certain extent, it will also bring some negative impacts. Excessive penetration depth may lead to an increase in the heat-affected zone of the welding area, posing a risk of burning the seal 4, and causing significant changes in the material structure of the electrode terminal 2 and the connecting member 3, reducing the material properties, such as hardness and toughness. In addition, excessive welding may also cause significant welding deformation, affecting the overall dimensional accuracy and assembly performance of the cover plate, and even having an adverse impact on the sealing performance of other components such as the seal 4.

[0067] Controlling the penetration depth c within the range of 0.3 mm - 2 mm helps to reduce the occurrence of welding defects. When the penetration depth is too shallow, problems such as lack of fusion and false welding may occur, resulting in a decrease in the strength and sealing performance of the welded part. When the penetration depth is too large, defects such as porosity and cracks are likely to occur, which will seriously affect the welding quality and the safety of the structure. An appropriate penetration depth can make the welding process more stable and ensure the quality of the weld seam 55 is uniform and reliable.

[0068] In specific implementation, the cover plate assembly further includes a first insulating member 6 and a second insulating member 7. The first insulating member 6 is disposed between the connecting member 3 and the cover plate body 1; the second insulating member 7 is disposed on the surface of the cover plate body 1 facing away from the first insulating member 6. The first insulating member 6 is sleeved outside the connecting member 3 and the bent portion 421, and the second insulating member 7 is sleeved outside the circumferential direction of the first connecting portion 21 of the electrode terminal 2. A tight sealing fit is formed between the sealing member 4 and the electrode terminal 2, the cover plate body 1 and the first connecting portion 21. The first connecting portion 21 and the cover plate body 1 compress the first sealing portion 41, the side wall of the second connecting portion 22 and the cover plate body 1 compress the body portion 422, and the connecting member 3 and the cover plate body 1 compress the bent portion 421. During the assembly process of the cover plate assembly, by appropriately compressing the first sealing portion 41, the sealing member 4 as a whole generates axial and radial elastic deformations to fill the gaps between the components and form a reliable seal. It should be noted that good contact needs to be ensured between the connecting member 3 and the electrode terminal 2 to ensure the smooth transmission of current; the cover plate body 1 and the first sealing portion 41 need to be closely attached to play its role of protection, conduction and heat dissipation. In addition, the assembly sequence between the components is also very important and needs to be installed according to certain process requirements to ensure the stability and reliability of the entire cover plate structure. Through the double-layer sealing structure of the sealing member 4, the cover plate assembly can effectively prevent the leakage of electrolyte and the intrusion of external impurities, ensuring the safety and reliability of the battery. Good sealing performance can also extend the service life of the battery and reduce the maintenance cost. And during the use of the battery, it can withstand a certain amount of vibration and impact, ensuring that the connections between the components are firm and reliable and are not prone to loosening or damage.

[0069] The embodiment of the present application further provides a battery, including at least one battery cell, and the battery cell includes the above-mentioned cover plate assembly.

[0070] It can be seen that in the battery cell provided by the embodiment of the present application, the second sealing portion 42 of the sealing member 4 of the cover plate assembly can be bent and pressed between the connecting member 3 and the cover plate body 1 under the guiding action of the guiding member 31, and the first sealing portion 41 is pressed between the first connecting portion 21 and the cover plate body 1. It is equivalent to having two sealing components along the thickness direction of the cover plate assembly. The two sealing components can compress and seal at two positions. When the electrode terminal 2 is subjected to a downward thrust from above and the position of the cover plate body 1 remains unchanged, the compression rate of the first sealing portion 41 will become smaller, but the compression rate of the second sealing portion 42 will be pressed tighter instead. Similarly, when the electrode terminal 2 is subjected to an upward force from below, the first sealing portion 41 will become larger. No matter in which direction the electrode terminal 2 is stressed, there is always a part of the compression rate in the sealing member 4 that can ensure airtightness, and it can avoid the situation of insufficient compression rate of the sealing member 4 and leakage of air and liquid under the action of external forces on the cover plate assembly.

[0071] The embodiment of the present application also provides an electrical device, including the above battery.

[0072] Since the electrical device adopts the battery in the above embodiment, the beneficial effects of the electrical device can be referred to the above embodiment.

[0073] The electrical device of the present invention is not particularly limited, and it may include but is not limited to: laptop computers, pen input computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, head-mounted stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, minidiscs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, motorized bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.

[0074] The embodiment of the present application also provides a battery cell, including the above cover plate. Therefore, on the basis of the above cover plate embodiment, the battery cell of the embodiment of the present application at least has all the beneficial effects brought by the technical solution of the above cover plate embodiment. Similarly, the embodiment of the present application also provides a battery, including the above battery cell, and also at least has all the beneficial effects brought by the technical solution of the above cover plate embodiment.

[0075] The basic principle of the present application has been described above in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. In addition, the above disclosed specific details are only for the purpose of illustration and easy understanding, rather than limitations, and the above details do not limit the present application to necessarily adopt the above specific details to implement.

[0076] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any way. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the word "and / or", and can be used interchangeably with it, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0077] It should also be noted that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present application.

[0078] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Thus, the present application is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0079] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only for more clearly elaborating the technical solutions and cannot be used to limit the protection scope of the present application.

[0080] The above description has been presented for purposes of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the form disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims

1. A cover plate assembly, characterized in that, Comprising: A cover plate body (1) having a mounting hole (11) penetrating in its thickness direction; An electrode terminal (2) disposed in the mounting hole (11), the electrode terminal (2) including a first connecting portion (21) and a second connecting portion (22), the first connecting portion (21) being disposed on one side of the cover plate body (1) and covering the mounting hole (11), and the second connecting portion (22) passing through the mounting hole (11) and extending toward the other side of the cover plate body (1); A connecting member (3) disposed on the other side of the cover plate body (1) relative to the first connecting portion (21), the second connecting portion (22) being sleeved on the connecting member (3) and connected to the connecting member (3); a guiding member (31) protruding from a side surface of the connecting member (3) close to the cover plate body (1) is provided, and the guiding member (31) is disposed close to the second connecting portion (22); A sealing member (4) including a connected first sealing portion (41) and a second sealing portion (42), along the axial direction of the mounting hole (11), the first sealing portion (41) is pressed between the first connecting portion (21) and the cover plate body (1), and at least a part of the side surface of the guiding member (31) abuts against the second sealing portion (42) and bends a part of the second sealing portion (42) to be pressed between the connecting member (3) and the cover plate body (1).

2. The cover plate assembly according to claim 1, wherein At least a part of the side surface of the guiding member (31) abutting against the second sealing portion (42) is an inclined surface (311), along the axial direction of the connecting member (3), the inclined surface (311) inclines from a direction close to the second connecting portion (22) to a direction away from the second connecting portion (22).

3. The cover plate assembly according to claim 1 or 2, characterized in that, The second sealing portion (42) includes a body portion (422) and a bending portion (421), and the body portion (422) is connected between the first connecting portion (21) and the bending portion (421); Wherein, in a first state, along the radial direction of the sealing member (4), the outer peripheral surfaces of the body portion (422) and the bending portion (421) are flush, and the inner peripheral surface of the body portion (422) is closer to the central axis of the sealing member (4) than the inner peripheral surface of the bending portion (421); the inclined surface (311) of the guiding member (31) abuts against the inner peripheral surface of the bending portion (421).

4. The cover plate assembly according to claim 3, characterized in that Along the radial direction of the sealing member (4), the inner peripheral surface of the body portion (422) is flush with the inner peripheral surface of the first sealing portion (41).

5. The cover plate assembly according to claim 3, wherein The compression ratio of the bending portion (421) in its thickness direction is greater than or equal to 25% and less than or equal to 50%; And / or, the compression ratio of the first sealing portion (41) in its thickness is greater than or equal to 25% and less than or equal to 50%.

6. The cover plate assembly according to claim 2, wherein The included angle between the inclined surface (311) and the vertical direction is α, satisfying: 15° ≤ α ≤ 45°.

7. The cover plate assembly according to claim 1, wherein, A weld seam (5) is formed on the connection surface between the connecting member (3) and the second connecting portion (22).

8. The cover plate assembly according to claim 1, wherein, Further comprising: A first insulating member (6) disposed between the connecting member (3) and the cover plate body (1); The second insulating member (7) is disposed on the surface of the cover plate body (1) facing away from the first insulating member (6).

9. A battery, characterized in that, Comprising the cover plate assembly according to any one of claims 1-8.

10. An electrical device, characterized in that, Comprising the battery according to claim 9.

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