Cover plate assembly, battery and electric equipment

Abstract

The utility model provides a cover plate assembly, a battery and electric equipment. The cover plate assembly comprises a terminal and a body, the body comprises a first connecting part and a second connecting part, the first connecting part is connected with the terminal, the second connecting part is connected to the side, away from the terminal, of the first connecting part, and an explosion-proof structure is formed at the joint of the first connecting part and the second connecting part. According to the cover plate assembly, when the battery is subjected to thermal runaway, the terminal can be separated from the collector plate of the battery, so that the battery can be powered off, the situation that the thermal runaway is aggravated due to the fact that the battery is still discharged when being subjected to thermal runaway can be avoided, and the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a cover plate assembly, a battery and an electric device. BACKGROUND

[0002] Batteries are widely used in energy storage systems, vehicles and consumer electronics, etc. Thermal runaway of a battery refers to a phenomenon that a chemical reaction is accelerated due to an internal temperature rise in the battery during operation, which leads to a further temperature rise, thereby forming a self-enhancing feedback loop, and eventually causing the battery to overheat, smoke, burn or even explode.

[0003] In the related art, when the battery is in thermal runaway, the battery is still discharging, which can easily lead to an intensification of the thermal runaway, and the safety of the battery needs to be improved. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a cover plate assembly, a battery and an electric device, which can improve the technical problem that the battery is still discharging when the battery is in thermal runaway.

[0005] In a first aspect, embodiments of the present application provide a cover plate assembly, comprising:

[0006] a terminal;

[0007] a body comprising a first connecting portion and a second connecting portion, the first connecting portion is connected to the terminal, and the second connecting portion is connected to one side of the first connecting portion away from the terminal;

[0008] An explosion-proof structure is formed at a connection between the first connecting portion and the second connecting portion.

[0009] In an embodiment, the first connecting portion is formed with a first clamping groove, and the terminal is clamped in the first clamping groove.

[0010] In an embodiment, the cover plate assembly further comprises a first cover plate, the first cover plate is mounted to the second connecting portion, and the first cover plate is used to connect with a battery shell.

[0011] In an embodiment, along a radial direction of the terminal, one side of the first cover plate away from the terminal protrudes from the second connecting portion.

[0012] In an embodiment, the first connecting portion is formed with a lap portion, and the terminal is formed with an extension portion, the extension portion is at least partially lapped on one side of the lap portion away from an inner bottom wall of the shell.

[0013] In an embodiment, the cover plate assembly further comprises a second cover plate, and the second cover plate is mounted to the first connecting portion.

[0014] In an embodiment, the first connecting portion is formed with a second clamping groove, and the second cover plate is clamped in the second clamping groove.

[0015] In an embodiment, the body is formed with a positioning hole, and a projection of the body along an axial direction of the terminal at least partially overlaps the positioning hole.

[0016] In an embodiment, the terminal is a first pole of a battery, the first cover plate is a second pole of the battery, and the second cover plate is made of an insulating material.

[0017] In an embodiment, the body is formed with a protruding portion between the first cover plate and the second cover plate.

[0018] In an embodiment, the body includes an insulating member having the first connecting portion and the second connecting portion, and the insulating member is sleeved on a side wall surface of the terminal.

[0019] In an embodiment, the insulating member, the first cover plate, the second cover plate, and the terminal are connected by injection molding.

[0020] In an embodiment, the explosion-proof structure includes a fracture zone formed in the body, and a minimum thickness D of the fracture zone satisfies 0.1 mm ≤ D ≤ 0.8 mm.

[0021] In an embodiment, the body is formed with a pressure relief opening, the protruding portion is clamped in the pressure relief opening, the fracture zone is arranged close to the pressure relief opening, a height of the protruding portion is H1, a height of the pressure relief opening is H2, and H1 ≤ H2 is satisfied.

[0022] In an embodiment, the pressure relief opening is arranged as an arc-shaped opening, and a central angle corresponding to the arc-shaped opening is β, and 180° ≤ β ≤ 360° is satisfied.

[0023] In a second aspect, an embodiment of the present application provides a battery, including a shell, a roll core, and a cover plate assembly as described above, the shell is formed with a mounting cavity, the roll core is mounted in the mounting cavity, and the cover plate assembly is connected to the shell.

[0024] In an embodiment, a ratio of a cross-sectional area of the first connecting portion to a cross-sectional area of the roll core is between 0.1 and 0.5.

[0025] In an embodiment, the body is provided with a reinforcing rib.

[0026] In an embodiment, the reinforcing rib protrudes from a side of the body facing the roll core.

[0027] In an embodiment, the reinforcing rib abuts against the roll core.

[0028] In an embodiment, the ratio of the height of the reinforcing rib protruding from the body toward the side of the winding core to the height of the winding core is less than or equal to 0.2 along the axial direction of the shell.

[0029] In a third aspect, an embodiment of the present application provides a battery, including the battery described above.

[0030] The beneficial effects of the embodiments of the present application are as follows:

[0031] In the embodiments of the present application, by arranging the explosion-proof structure at the connection between the first connecting part and the second connecting part, when the battery is in thermal runaway, the explosion-proof structure is broken, so that the first connecting part can be separated from the second connecting part under the action of the gas or pressure generated by the thermal runaway of the battery, and since the first connecting part is connected with the terminal, the terminal can be separated from the second connecting part together with the first connecting part, so that the terminal can be separated from the current collector disc of the battery, and the battery can be powered off, which can avoid the situation that the battery is still discharging when the battery is in thermal runaway, and the thermal runaway is aggravated, and the safety of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0033] Figure 1 is a structural schematic view of a cover plate assembly provided by an embodiment of the present application;

[0034] Figure 2 is a sectional view of the cover plate assembly provided by an embodiment of the present application;

[0035] Figure 3 is a sectional view of a cover plate assembly without a second cover plate provided by an embodiment of the present application;

[0036] Figure 4 is a partial structural schematic view of a body provided by an embodiment of the present application;

[0037] Figure 5 is a second structural schematic view of a cover plate assembly provided by an embodiment of the present application;

[0038] Figure 6 is a structural schematic view of a battery provided by an embodiment of the present application. DETAILED DESCRIPTION

[0039] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application. In addition, it should be understood that the specific implementation described herein is only used to illustrate and explain the present application, and is not used to limit the present application. In the present application, the orientation words such as "upper" and "lower" generally refer to the upper and lower in the actual use or working state of the device, and specifically refer to the direction of the drawing surface in the drawings; and "inner" and "outer" refer to the contour of the device.

[0040] The technical solutions of the cover plate assembly, the battery and the electric device according to the present application will be described below. Figures 1 to 6 The cover plate assembly, the battery and the electric device according to the present application are described.

[0041] According to the embodiments of the first aspect of the present application, referring to Figure 1 and Figure 2 The cover plate assembly comprises a terminal 1 and a body 2, the body 2 comprises a first connecting part 21 and a second connecting part 22, the first connecting part 21 is connected with the terminal 1, the second connecting part 22 is connected to the side of the first connecting part 21 away from the terminal 1, and an explosion-proof structure 23 is formed at the connection between the first connecting part 21 and the second connecting part 22.

[0042] According to the cover plate assembly of the embodiments of the present application, when the battery is in thermal runaway, the explosion-proof structure 23 is broken, so that the first connecting part 21 can be separated from the second connecting part 22 under the action of the gas or pressure generated by the thermal runaway of the battery. Since the first connecting part 21 is connected with the terminal 1, the terminal 1 can be separated from the second connecting part 22 together with the first connecting part 21, so that the terminal 1 can be separated from the current collector disc of the battery, and the battery can be powered off, thereby avoiding the situation that the battery is still discharging when the battery is in thermal runaway, which aggravates the thermal runaway, and improving the safety of the battery.

[0043] In some examples, the body 2 can be a structural member, and the explosion-proof structure 23 divides the structural member into the first connecting part 21 and the second connecting part 22.

[0044] In some examples, the first connecting part 21 can be a structural member, and the second connecting part 22 can be a structural member. The first connecting part 21 can also be formed by connecting two or more structural members, and the second connecting part 22 can also be formed by connecting two or more structural members.

[0045] In some examples, the second connecting part 22 can be directly connected with the shell 5 of the battery, that is, the body 2 can directly serve as a cover plate. The second connecting part 22 can also be connected with the shell 5 of the battery through other structural members, that is, the body 2 does not directly serve as a cover plate, for example, the body 2 is an insulating member 26, the insulating member 26 is connected with a cover plate, and the cover plate is connected with the shell 5 of the battery.

[0046] In some embodiments, referring to Figure 2 、 Figure 3 and Figure 4 , the first connecting part 21 is formed with a first clamping groove 211, and the terminal 1 is clamped in the first clamping groove 211.

[0047] It can be understood that the clamping of the first connecting part 21 and the terminal 1 together improves the connection stability of the first connecting part 21 and the terminal 1, and ensures that when the battery is in thermal runaway, the terminal 1 can be separated from the second connecting part 22 together with the first connecting part 21, so that the terminal 1 can be separated from the current collector of the battery, ensuring that the battery can be powered off when thermal runaway occurs, and improving the safety of the battery.

[0048] In some examples, the first connecting part 21 is formed with a supporting part towards one side of the inner bottom wall of the shell 5 of the battery, and the terminal 1 is connected to the supporting part away from the inner bottom wall of the shell 5. Further, when the battery is in thermal runaway, the explosion-proof structure 23 breaks, and the first connecting part 21 and the supporting part are separated, that is, the first connecting part 21 and the supporting part move away from the inner bottom wall of the shell 5. Since the terminal 1 is connected to the supporting part away from the inner bottom wall of the shell 5, that is, the terminal 1 is in the moving path of the supporting part, the supporting part will drive the terminal 1 to move together, so that the terminal 1 is separated from the current collector, realizing the power-off of the battery.

[0049] It can be understood that the end surface of the terminal 1 towards one end of the inner bottom wall of the shell 5 includes two area surfaces, one of which abuts against the supporting part, and the other of which is electrically connected with the current collector of the battery.

[0050] In some embodiments, referring to Figure 2 、 Figure 3 and Figure 4 , the cover plate assembly further comprises a first cover plate 3, the first cover plate 3 is installed on the second connecting part 22, and the first cover plate 3 is used to connect with the shell 5 of the battery.

[0051] It can be understood that the first cover plate 3 is installed at the second connecting part 22, and the first cover plate 3 can play a protective role for the second connecting part 22.

[0052] The first cover plate 3 is connected with the shell 5 of the battery, so that the cover plate assembly is connected with the shell 5 of the battery. Meanwhile, the first cover plate 3 is installed on the second connecting portion 22, and the first cover plate 3 will not affect the disconnection of the first connecting portion 21 from the second connecting portion 22, thereby ensuring that the first connecting portion 21 and the terminal 1 can be disconnected from the second connecting portion 22.

[0053] In some examples, the first cover plate 3 and the terminal 1 are located on two sides of the explosion-proof structure 23 respectively, and the first cover plate 3 will not affect the disconnection of the terminal 1. Therefore, when the battery is in thermal runaway, the terminal 1 can be disconnected together with the first connecting portion 21, thereby achieving the power-off of the battery.

[0054] In some embodiments, referring to Figure 2 and Figure 3 , the side of the first cover plate 3 away from the terminal 1 protrudes from the second connecting portion 22 along the radial direction of the terminal 1.

[0055] It can be understood that the end of the first cover plate 3 is arranged to protrude from the second connecting portion 22, so that the protruding part of the first cover plate 3 can be connected with the shell 5 of the battery, thereby facilitating the connection between the first cover plate 3 and the shell 5 of the battery.

[0056] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the first connecting portion 21 is formed with a lapping portion 212, and the terminal 1 is formed with an extension portion 11, and the extension portion 11 is at least partially lapped on the side of the lapping portion 212 away from the inner bottom wall of the shell 5.

[0057] It can be understood that the extension portion 11 of the terminal 1 is lapped on the side of the lapping portion 212 away from the inner bottom wall of the shell 5, and the lapping portion 212 of the first connecting portion 21 can support the terminal 1.

[0058] It can be understood that when the battery is in thermal runaway, the gas or pressure in the shell 5 of the battery will act on the explosion-proof structure 23, causing the explosion-proof structure 23 to break, and then the first connecting portion 21 can be disconnected from the second connecting portion 22. When the first connecting portion 21 is disconnected from the second connecting portion 22, the lapping portion 212 of the first connecting portion 21 can drive the terminal 1 to move away from the shell 5, so that the terminal 1 can be disconnected together with the first connecting portion 21, thereby achieving the power-off of the battery and improving the safety of the battery.

[0059] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the cover plate assembly further comprises a second cover plate 4, and the second cover plate 4 is installed on the first connecting portion 21.

[0060] It can be understood that the second cover plate 4 can play a protective role on the first connecting part 21. Meanwhile, the second cover plate 4 is installed on the first connecting part 21, and the second cover plate 4 and the first cover plate 3 are arranged in a spaced manner. When the battery is in thermal runaway, the second cover plate 4 and the first connecting part 21 can be separated from the second connecting part 22 together, and the second cover plate 4 will not affect the separation of the first connecting part 21 and the terminal 1.

[0061] In some embodiments, referring to Figure 2 、 Figure 3 and Figure 4 , the first connecting part 21 is formed with a second clamping groove 213, and the second cover plate 4 is clamped in the second clamping groove 213.

[0062] It can be understood that the clamping connection of the first connecting part 21 and the second cover plate 4 improves the connection stability of the first connecting part 21 and the second cover plate 4. Further, when the battery is in thermal runaway, it is ensured that the second cover plate 4 can be separated together with the first connecting part 21, avoiding the influence of the second cover plate 4 on the pressure relief of the battery.

[0063] It can be understood that the clamping connection of the first connecting part 21 and the second cover plate 4 improves the connection convenience of the first connecting part 21 and the second cover plate 4. Meanwhile, it is ensured that the first connecting part 21 can take the second cover plate 4 away from the battery when the battery is in thermal runaway, avoiding the second cover plate 4 from falling into the shell 5 of the battery, and preventing the second cover plate 4 from affecting the pressure relief of the battery.

[0064] In some embodiments, referring to Figure 5 , the body 2 is formed with a positioning hole 24, and the orthographic projection of the second cover plate 4 on the body 2 at least partially coincides with the positioning hole 24 along the axial direction of the terminal 1.

[0065] It can be understood that since the first cover plate 3 and the second cover plate 4 are not directly connected, when the second cover plate 4 is installed, an external force can be applied to the second cover plate 4 through the positioning hole 24 to keep the second cover plate 4 fixed, realizing the positioning of the second cover plate 4, and the second cover plate 4 can be fixed at the corresponding position, which is beneficial to ensuring the consistency of the cover plate assembly structure.

[0066] In some embodiments, the terminal 1 is a first pole of the battery, the first cover plate 3 is a second pole of the battery, and the second cover plate 4 is an insulating material.

[0067] It can be understood that the second cover plate 4 is arranged between the terminal 1 and the first cover plate 3, and the terminal 1 and the first cover plate 3 are arranged to be electrified, while the second cover plate 4 is not electrified. The insulation separation effect between the terminal 1 and the first cover plate 3 can be increased to ensure the insulation of the battery.

[0068] For example, the terminal 1 is a positive electrode of a battery, for example, and is positively charged. The first cover plate 3 is a negative electrode of the battery, for example, and is negatively charged.

[0069] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the body 2 is formed with a protrusion 25, which is located between the first cover plate 3 and the second cover plate 4.

[0070] It can be understood that the protrusion 25 can separate the first cover plate 3 and the second cover plate 4, so that the first cover plate 3 and the second cover plate 4 are arranged in a spaced manner and do not directly contact each other. Further, when the battery is in thermal runaway, the separation of the second cover plate 4 will not be interfered with and affected by the first cover plate 3, thereby ensuring that the second cover plate 4 and the first connecting portion 21 can be smoothly separated.

[0071] In some examples, the protrusion 25 is connected to the explosion-proof structure 23.

[0072] In some embodiments, referring to Figure 2 , Figure 3 and Figure 4 , the body 2 includes an insulating member 26, which has the first connecting portion 21 and the second connecting portion 22, and is sleeved on the side wall surface of the terminal 1.

[0073] It can be understood that the insulating member 26 is sleeved on the side wall surface of the terminal 1, so that the insulating member 26 wraps the side wall surface of the terminal 1, thereby improving the insulation performance of the cover plate assembly.

[0074] In some examples, the upper end surface of the terminal 1 is flush with the upper end surface of the insulating member 26, and the lower end surface of the terminal 1 is flush with the lower end surface of the insulating member 26. That is, the insulating member 26 can completely wrap the side wall surface of the terminal 1, avoid the side wall surface of the terminal 1 from being exposed, prevent the positive and negative electrodes of the cover plate assembly from being in contact, and ensure the insulation of the cover plate assembly and the battery. At the same time, the upper end surface and the lower end surface of the terminal 1 are not wrapped by the insulating member 26, so that the terminal 1 and the current collector plate can be connected, and the terminal 1 and the external equipment can be electrically connected.

[0075] In some embodiments, the insulating member 26, the first cover plate 3, the second cover plate 4 and the terminal 1 are connected by injection molding.

[0076] It can be understood that the insulating member 26, the first cover plate 3, the second cover plate 4 and the terminal 1 are connected by injection molding, which can increase the strength of the terminal 1 and make the terminal 1 have better torsional resistance, thereby ensuring the sealing performance of the cover plate assembly and the insulation performance of the positive and negative electrodes of the cover plate assembly.

[0077] It can be understood that the insulating piece 26 is wrapped on the side wall surface of the terminal 1 by injection molding, which can improve the injection strength reliability and structural reliability, and reduce the risk of liquid leakage.

[0078] It can be understood that the insulating piece 26, the first cover plate 3, the second cover plate 4 and the terminal 1 are integrated together, which improves the integration of the cover plate assembly and is conducive to reducing the assembly process of the battery.

[0079] In some embodiments, referring to Figure 2 and Figure 4 The explosion-proof structure 23 includes a fracture zone 231 formed in the body 2, and the minimum thickness of the fracture zone 231 satisfies: 0.1 mm≤D≤0.8 mm.

[0080] It can be understood that under the action of the internal gas pressure of the battery, the minimum thickness position of the fracture zone 231 will be broken. The fracture zone 231 can select the value of the minimum thickness of the fracture zone 231 based on the opening value of the explosion-proof structure of the cover plate assembly. The minimum thickness value of the fracture zone 231 is positively correlated with the opening value of the explosion-proof structure. Specifically, the greater the opening value of the explosion-proof structure, the greater the minimum thickness value of the fracture zone 231; the smaller the opening value of the explosion-proof structure, the smaller the minimum thickness value of the fracture zone 231.

[0081] It should be noted that when the minimum thickness of the fracture zone 231 is greater than 0.8 mm, the height of the fracture zone 231 will be too large, which will cause the opening value of the explosion-proof structure to be too high and cannot meet the use requirements. At the same time, when the minimum thickness of the fracture zone 231 is greater than 0.8 mm, the protruding portion 25 will protrude outward from the pressure relief port 28 after being arranged on the body 2, which will affect the appearance of the top cover assembly. When the minimum thickness of the fracture zone 231 is less than 0.1 mm, the fracture zone 231 cannot be formed by injection molding. Therefore, in the embodiments of the present application, the thickness of the minimum thickness region of the fracture zone 231 is set to be in the range of 0.1 mm to 0.8 mm, so as to ensure that the body 2 can be formed by injection molding process, and to ensure that the explosion-proof structure has a suitable opening value and prevent the protruding portion 25 from passing through the pressure relief port 28.

[0082] For example, the minimum thickness of the fracture zone 231 is set to 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, or any value between any two of them.

[0083] In some embodiments, the projection of the fracture zone 231 covers at least part of the pressure relief port 28 in the height direction of the battery.

[0084] It can be understood that the projection of the fracture zone 231 covers at least the pressure relief port 28, and when the body 2 is broken at the position of the fracture zone 231, the gas can overflow from the pressure relief port 28, so as to prevent the gas from accumulating in the battery shell and causing safety hazards.

[0085] In some embodiments, the projection of the fracture zone 231 along the height direction of the battery just covers the pressure relief port 28.

[0086] In some embodiments, the projection of the fracture zone 231 along the height direction of the battery exceeds the periphery of the pressure relief port 28. For example, the pressure relief port 28 is arranged in a circular ring shape, and the fracture zone 231 is also arranged in a circular ring shape. The inner diameter of the fracture zone 231 is smaller than the inner diameter of the pressure relief port 28. The outer diameter of the fracture zone 231 is greater than the outer diameter of the pressure relief port 28.

[0087] In some embodiments, referring to Figure 2 and Figure 4 , the body 2 is formed with the pressure relief port 28, the protruding portion 25 is clamped in the pressure relief port 28, the fracture zone 231 is arranged close to the pressure relief port 28, the height of the protruding portion 25 is H1, the height of the pressure relief port 28 is H2, and H1≤H2 is satisfied.

[0088] It can be understood that the height of the protruding portion 25 is less than or equal to the height of the pressure relief port 28 to prevent the protruding portion 25 from penetrating through the pressure relief port 28 and affecting the appearance and pressure relief effect. If the height of the protruding portion 25 is greater than the height of the pressure relief port 28, the protruding portion 25 will protrude on the surface of the body 2, which will affect the appearance of the cover plate assembly on the one hand, and on the other hand, the protruding portion 25 may continue to seal the pressure relief port 28 after the fracture of the fracture zone 231 below, affecting the pressure relief effect.

[0089] In some embodiments, the pressure relief port 28 is arranged as an arc-shaped opening. The arc-shaped opening corresponds to a central angle β, and 180°≤β≤360° is satisfied.

[0090] It can be understood that when the central angle corresponding to the pressure relief port 28 is greater than or equal to 180°, the body can be bent away from the electrode assembly along the extension area of the pressure relief port 28, and the body can be deformed. In the embodiments of the present application, the central angle corresponding to the arc-shaped opening is preferably set to 360° to form a circular ring-shaped pressure relief port 28. When the cover body is subjected to the action of the internal pressure of the battery, the area of the body on the inside of the arc-shaped opening can be pushed out by the pressure to fall off to expand the opening size of the pressure relief port 28.

[0091] In some embodiments, the pressure relief port 28 can also be arranged in other shapes. For example, the pressure relief port 28 is arranged as an elliptical opening, a square opening, etc. It is only necessary to ensure that the pressure relief port 28 can achieve pressure relief, and the cover plate 10 can be bent or fall off along the extension area of the pressure relief port 28.

[0092] According to the embodiments of the second aspect of the present application, referring to Figure 6 , the battery comprises a shell 5, a roll core 6, and the cover plate assembly described above, the shell 5 is formed with a mounting cavity 51, the roll core 6 is mounted in the mounting cavity 51, and the cover plate assembly is connected to the shell 5.

[0093] According to the battery embodiment of this application, by setting the explosion-proof structure 23 at the connection between the first connecting part 21 and the second connecting part 22, when the battery experiences thermal runaway, the explosion-proof structure 23 breaks, allowing the first connecting part 21 to detach from the second connecting part 22 under the action of gas or pressure generated by the battery's thermal runaway. Since the first connecting part 21 is connected to the terminal 1, the terminal 1 can detach from the second connecting part 22 together with the first connecting part 21, allowing the terminal 1 to separate from the battery's current collector, thereby disconnecting the battery from power. This avoids the situation where the battery continues to discharge when thermal runaway occurs, which could lead to an aggravation of thermal runaway, thus improving the safety of the battery.

[0094] In some embodiments, the ratio of the cross-sectional area of ​​the first connecting portion 21 to the cross-sectional area of ​​the core 6 is between 0.1 and 0.5.

[0095] Understandably, when the battery experiences thermal runaway, the explosion-proof structure 23 at the connection between the first connection 21 and the second connection 22 breaks, and the first connection 21 detaches, allowing the gas and pressure inside the battery to be released through the installation location of the first connection 21.

[0096] The larger the cross-sectional area of ​​the core 6, the more gas and pressure will be generated during battery thermal runaway. If the ratio of the cross-sectional area of ​​the first connecting portion 21 to the cross-sectional area of ​​the core 6 is less than 0.1, the gas and pressure inside the battery will be difficult to release quickly during thermal runaway. If the ratio is greater than 0.5, the cross-sectional area of ​​the first connecting portion 21 is too large, which can easily lead to a waste of pressure relief area. Therefore, this application sets the ratio of the cross-sectional area of ​​the first connecting portion 21 to the cross-sectional area of ​​the core 6 between 0.1 and 0.5.

[0097] In some examples, the cross-sectional area of ​​core 6 refers to the maximum cross-sectional area of ​​core 6. When core 6 is a cylindrical structure, the cross-sectional area of ​​core 6 refers to the area of ​​the end face of core 6. When core 6 is a square structure with multiple surfaces, the cross-sectional area of ​​core 6 refers to the area of ​​the surface with the largest area of ​​core 6.

[0098] In some embodiments, see Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The main body 2 is provided with reinforcing ribs 27.

[0099] Understandably, the reinforcing rib 27 can effectively improve the structural strength of the body 2 and ensure the strength of the cover plate assembly.

[0100] In some embodiments, see Figure 2 ,Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The reinforcing rib 27 protrudes from the side of the body 2 facing the winding core 6.

[0101] It can be understood that the reinforcing rib 27 is connected to the side of the body 2 facing the winding core 6, and the reinforcing rib 27 protrudes from the side of the body 2 facing the winding core 6, so that the reinforcing rib 27 can not only improve the structural strength of the cover plate assembly, but also form an air chamber space between the winding core 6 and the side of the body 2 facing the winding core 6, which can be used to accommodate the gas generated during normal operation of the battery, avoid the case that the internal pressure of the battery is too large during normal operation of the battery, and ensure that the battery can work normally.

[0102] In some embodiments, referring to Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 The reinforcing rib 27 abuts against the winding core 6.

[0103] It can be understood that the winding core 6 is installed in the mounting cavity 51 of the shell 5, and the end of the reinforcing rib 27 and the winding core 6 away from the inner bottom wall of the shell 5 abuts against, so that the reinforcing rib 27 can fix the winding core 6 and improve the installation stability of the winding core 6 in the mounting cavity 51.

[0104] In some embodiments, along the axial direction of the shell 5, the ratio of the height of the reinforcing rib 27 protruding from the side of the body 2 facing the winding core 6 to the height of the winding core 6 is less than or equal to 0.2.

[0105] It can be understood that when the ratio of the height of the reinforcing rib 27 protruding from the side of the body 2 facing the winding core 6 to the height of the winding core 6 is greater than 0.2, the height of the reinforcing rib 27 is too high, the reinforcing rib 27 will have a greater impact on the size of the battery, and at this time the reinforcing rib 27 will cause the air chamber space between the winding core 6 and the side of the body 2 facing the winding core 6 to be too large, and when the battery is in thermal runaway, the explosion-proof structure 23 can not be broken in time. Therefore, the ratio of the height of the reinforcing rib 27 protruding from the side of the body 2 facing the winding core 6 to the height of the winding core 6 is set to be less than or equal to 0.2.

[0106] In some embodiments, the explosion-proof structure 23 is arranged adjacent to or spaced from the reinforcing rib 27, that is, the explosion-proof structure 23 is not arranged at the reinforcing rib 27, so as to ensure that the explosion-proof structure 23 will be broken when the battery is in thermal runaway.

[0107] In some embodiments, the reinforcing rib 27 comprises a ring-shaped reinforcing rib, and the ring-shaped reinforcing rib surrounds the terminal 1. The ring-shaped reinforcing rib 27 can effectively strengthen the structure of the body 2.

[0108] Specifically, the number of the annular reinforcing ribs is at least two, and the explosion-proof structure 23 is arranged between the two annular reinforcing ribs, that is, one annular reinforcing rib is arranged at the first connecting portion 21, and the other annular reinforcing rib is arranged at the second connecting portion 22, so that the annular reinforcing rib does not affect the fracture of the explosion-proof structure 23, and it is ensured that the explosion-proof structure 23 can normally fracture when the battery is in thermal runaway, so that the gas and pressure in the battery can be released.

[0109] In some embodiments, the reinforcing rib 27 includes a long-strip-shaped reinforcing rib connected to the annular reinforcing rib to improve the structural reinforcement of the body 2.

[0110] Specifically, the at least two annular reinforcing ribs include a first annular reinforcing rib and a second annular reinforcing rib, the side of the first annular reinforcing rib away from the second annular reinforcing rib is connected with a long-strip-shaped reinforcing rib, and the side of the second annular reinforcing rib away from the first annular reinforcing rib is connected with a long-strip-shaped reinforcing rib, thereby effectively reinforcing the structure of the body 2, and avoiding arranging the reinforcing rib 27 at the explosion-proof structure 23, so that the explosion-proof structure 23 and the reinforcing rib 27 are staggered, the reinforcing rib 27 can be avoided to affect the explosion-proof structure 23, and it is ensured that the explosion-proof structure 23 can normally fracture when the battery is in thermal runaway, so that the gas and pressure in the battery can be released.

[0111] In some embodiments, the cover plate assembly is connected with the shell 5 by welding, so as to ensure the sealing of the connection between the cover plate assembly and the shell 5, and realize the sealing of the battery.

[0112] It can be understood that in the related art, the sealing is performed by rolling and compression, the shell 5 is stretched during rolling, the wall thickness of the shell 5 is reduced at the rolling position, the strength is reduced, and the bonding force between the nickel layer and the shell 5 at the rolling position is reduced, which easily causes the nickel layer to peel off; the sealing ring is compressed and sealed between the shell 5 and the cover plate, the compression amount needs to be controlled when the sealing ring is compressed, and the compression amount is insufficient, which has a risk of liquid leakage, and the sealing ring is aged during long-time use, which greatly increases the risk of liquid leakage; the cover plate is also pressed during sealing, and irreversible deformation occurs, that is, the cover plate must have a certain strength to be sealed. The sealing of the present embodiment skips the rolling process, can avoid the strength reduction and nickel layer peeling caused by the rolling process, and is simpler and does not need to extrude the cover plate assembly.

[0113] According to the third aspect of the present application, the power consumption device includes the above-mentioned battery.

[0114] According to the power consuming device, when the battery is in thermal runaway, the explosion-proof structure 23 is broken, so that the first connecting part 21 can be separated from the second connecting part 22 under the action of the gas or pressure generated by the thermal runaway of the battery. Since the first connecting part 21 is connected with the terminal 1, the terminal 1 can be separated from the second connecting part 22 together with the first connecting part 21, so that the terminal 1 can be separated from the current collecting disc of the battery, and the battery can be powered off, thereby avoiding the situation that the battery is still discharging when the battery is in thermal runaway, and the thermal runaway is aggravated, and the safety of the battery is improved, and the safety of the power consuming device is improved.

[0115] It should be noted that the power consuming device can be a vehicle, can be an energy storage power source, can be a consumer electronic device, can be a medical device, can be a smart city, can also be an aircraft, and can also be a household appliance. It should be noted that the foregoing is only an example of the power consuming device, and does not specially limit the power consuming device.

[0116] The embodiments of the present application are described in detail above, and the specific examples are applied to the principles and implementation modes of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A cover plate assembly, characterized in that, include: terminal; The body includes a first connecting part and a second connecting part, the first connecting part being connected to the terminal, and the second connecting part being connected to the side of the first connecting part opposite to the terminal; An explosion-proof structure is formed at the connection between the first connecting part and the second connecting part.

2. The cover plate assembly according to claim 1, characterized in that, The first connecting portion has a first snap-fit ​​groove, and the terminal snaps into the first snap-fit ​​groove.

3. The cover plate assembly according to claim 1 or 2, characterized in that, The cover assembly further includes a first cover plate, which is mounted on the second connecting portion and is used to connect with the battery casing.

4. The cover plate assembly according to claim 3, characterized in that, Along the radial direction of the terminal, the first cover plate protrudes from the second connection portion on the side opposite to the terminal.

5. The cover plate assembly according to claim 3, characterized in that, The first connecting portion has an overlapping portion, and the terminal has an extension portion, the extension portion at least partially overlapping the overlapping portion on the side of the inner bottom wall of the housing away from the housing.

6. The cover plate assembly according to claim 3, characterized in that, The cover plate assembly further includes a second cover plate, which is mounted on the first connecting portion.

7. The cover plate assembly according to claim 6, characterized in that, The first connecting part has a second snap-fit ​​groove, and the second cover plate snaps into the second snap-fit ​​groove.

8. The cover plate assembly according to claim 6, characterized in that, The body has a positioning hole, and along the axial direction of the terminal, the second cover plate at least partially overlaps with the positioning hole in the orthographic projection of the body.

9. The cover plate assembly according to claim 6, characterized in that, The terminal is the first electrode of the battery, the first cover plate is the second electrode of the battery, and the second cover plate is made of insulating material.

10. The cover plate assembly according to claim 6, characterized in that, The body has a protrusion located between the first cover plate and the second cover plate.

11. The cover plate assembly according to claim 6, characterized in that, The body includes an insulating component, which has a first connecting portion and a second connecting portion, and the insulating component is sleeved on the side wall surface of the terminal.

12. The cover plate assembly according to claim 11, characterized in that, The insulating component, the first cover plate, the second cover plate, and the terminal are connected by injection molding.

13. The cover plate assembly according to claim 10, characterized in that, The explosion-proof structure includes a fracture zone formed in the body, and the minimum thickness of the fracture zone is D, which satisfies: 0.1 mm ≤ D ≤ 0.8 mm.

14. The cover plate assembly according to claim 13, characterized in that, The body has a pressure relief port, the protrusion is engaged with the pressure relief port, the fracture zone is located near the pressure relief port, the height of the protrusion is H1, the height of the pressure relief port is H2, satisfying: H1≤H2.

15. The cover plate assembly according to claim 14, characterized in that, The pressure relief port is configured as an arc-shaped opening, and the central angle corresponding to the arc-shaped opening is β, which satisfies: 180°≤β≤360°.

16. A battery, characterized in that, The device includes a housing, a core, and a cover assembly as described in any one of claims 1 to 15, wherein the housing has a mounting cavity, the core is mounted in the mounting cavity, and the cover assembly is connected to the housing.

17. The battery according to claim 16, characterized in that, The ratio of the cross-sectional area of ​​the first connecting portion to the cross-sectional area of ​​the winding core is between 0.1 and 0.

5.

18. The battery according to claim 16 or 17, characterized in that, The body is equipped with reinforcing ribs.

19. The battery according to claim 18, characterized in that, The reinforcing rib protrudes from the side of the body facing the core.

20. The battery according to claim 18, characterized in that, The reinforcing rib abuts against the core.

21. The battery according to claim 18, characterized in that, Along the axial direction of the housing, the height of the reinforcing rib protruding from the side of the body facing the core is less than or equal to 0.2 compared to the height of the core.

22. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 16 to 21.

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