Cover plate assembly, battery and electric equipment

Abstract

The invention 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 field of battery technology, and in particular to a cover assembly, a battery, and an electrical device. Background Art

[0002] Batteries are widely used in energy storage systems, transportation, and consumer electronics. Thermal runaway refers to a phenomenon in which a battery's internal temperature rises during operation, accelerating chemical reactions and causing further temperature increases. This creates a self-reinforcing feedback loop that can ultimately lead to battery overheating, smoking, combustion, or even explosion.

[0003] In related technologies, when a battery experiences thermal runaway, the battery is still discharging, which can easily lead to aggravated thermal runaway, and the safety of the battery needs to be improved. Summary of the Invention

[0004] The embodiments of the present application provide a cover plate assembly, a battery, and an electrical 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, an embodiment of the present application provides a cover plate assembly, comprising:

[0006] terminal;

[0007] The body includes a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the terminal, and the second connecting portion is connected to a side of the first connecting portion facing away from the terminal;

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

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

[0010] In one embodiment, the cover plate assembly further includes a first cover plate, the first cover plate is mounted on the second connecting portion, and the first cover plate is used to be connected to the battery housing.

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

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

[0013] In one embodiment, the cover plate assembly further includes a second cover plate, and the second cover plate is mounted on the first connecting portion.

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

[0015] In one embodiment, a positioning hole is formed on the body, and along the axial direction of the terminal, the orthographic projection of the second cover plate on the body at least partially overlaps with the positioning hole.

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

[0017] In one embodiment, a protrusion is formed on the body, and the protrusion is located between the first cover plate and the second cover plate.

[0018] In one 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 one embodiment, the insulating member, the first cover plate, the second cover plate, and the terminal are connected by injection molding.

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

[0021] In one embodiment, the body is formed with a pressure relief port, the protrusion is engaged with the pressure relief port, the fracture zone is arranged close to the pressure relief port, the height of the protrusion is H1, the height of the pressure relief port is H2, and the following condition is satisfied: H1≤H2.

[0022] In one embodiment, 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 the following: 180°≤β≤360°.

[0023] In a second aspect, an embodiment of the present application provides a battery, comprising a shell, a winding core, and the above-mentioned cover assembly, wherein the shell is formed with an installation cavity, the winding core is installed in the installation cavity, and the cover assembly is connected to the shell.

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

[0025] In one embodiment, the body is provided with reinforcing ribs.

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

[0027] In one embodiment, the reinforcing rib abuts against the winding core.

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

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

[0030] Beneficial effects of the embodiments of the present application:

[0031] In an embodiment of the present application, by providing an explosion-proof structure at the connection between the first connection part and the second connection part, when the battery has thermal runaway, the explosion-proof structure breaks, so that the first connection part can be separated from the second connection part under the action of the gas or pressure generated by the thermal runaway of the battery. The first connection part is connected to the terminal, and the terminal can be separated from the second connection part together with the first connection part, so that the terminal can be separated from the current collecting plate of the battery, and then the battery can be powered off, which can avoid the situation where the battery is still discharging when thermal runaway occurs, resulting in aggravated thermal runaway, thereby improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 This is one of the structural diagrams of the cover assembly provided in the embodiment of the present application;

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

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

[0036] Figure 4 This is a schematic diagram of a partial structure of the main body provided in an embodiment of the present application;

[0037] Figure 5 This is the second structural diagram of the cover assembly provided in an embodiment of the present application;

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

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; and "inside" and "outside" refer to the outline of the device.

[0040] The following combination Figures 1 to 6 The cover assembly, battery and electrical equipment of the present application are described.

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

[0042] According to the cover plate assembly of the embodiment of the present application, by setting the explosion-proof structure 23 at the connection between the first connection part 21 and the second connection part 22, when the battery has thermal runaway, the explosion-proof structure 23 breaks, so that the first connection part 21 can be separated from the second connection part 22 under the action of the gas or pressure generated by the thermal runaway of the battery. The first connection part 21 is connected to the terminal 1, and the terminal 1 can be separated from the second connection part 22 together with the first connection part 21, so that the terminal 1 can be separated from the collecting plate of the battery, and then the battery can be powered off, which can avoid the situation where the battery is still discharging when thermal runaway occurs, resulting in aggravated thermal runaway, thereby improving the safety of the battery.

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

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

[0045] In some examples, the second connection portion 22 can be directly connected to the battery housing 5, that is, the body 2 can directly serve as a cover. The second connection portion 22 can also be connected to the battery housing 5 through other structural members, that is, the body 2 does not directly serve as a cover. For example, the body 2 is an insulating member 26, the insulating member 26 is connected to the cover, and the cover is connected to the battery housing 5.

[0046] In some embodiments, see Figure 2 、 Figure 3 and Figure 4 The first connecting portion 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 snapping the first connecting part 21 and the terminal 1 together improves the connection stability between the first connecting part 21 and the terminal 1, and ensures that when the battery has 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 collecting plate of the battery, ensuring that the battery can be powered off in the event of thermal runaway, thereby improving the safety of the battery.

[0048] In some examples, a supporting portion is formed on the side of the first connection portion 21 facing the inner bottom wall of the battery housing 5, and the terminal 1 is connected to the side of the supporting portion facing away from the inner bottom wall of the housing 5. Furthermore, when the battery experiences thermal runaway, the explosion-proof structure 23 ruptures, and the first connection portion 21 and the supporting portion separate, that is, the first connection portion 21 and the supporting portion move away from the inner bottom wall of the housing 5. Since the terminal 1 is connected to the side of the supporting portion facing away from the inner bottom wall of the housing 5, that is, the terminal 1 is in the moving path of the supporting portion, the supporting portion will drive the terminal 1 to move together, causing the terminal 1 to separate from the current collecting plate, thereby disconnecting the battery.

[0049] It can be understood that the end surface of the terminal 1 facing the inner bottom wall of the housing 5 includes two area surfaces, one of which abuts against the supporting portion, and the other is electrically connected to the current collecting plate of the battery.

[0050] In some embodiments, see Figure 2 、 Figure 3 and Figure 4 The cover plate assembly further includes a first cover plate 3 , which is mounted on the second connecting portion 22 , and is used to connect to the battery housing 5 .

[0051] It can be understood that the first cover plate 3 is installed at the second connection portion 22 , and the first cover plate 3 can protect the second connection portion 22 .

[0052] The first cover plate 3 is connected to the battery housing 5, so that the cover plate assembly is connected to the battery housing 5. At the same time, the first cover plate 3 is installed on the second connecting portion 22, and the first cover plate 3 does not affect the detachment of the first connecting portion 21, ensuring that the first connecting portion 21 and the terminal 1 can be detached from the second connecting portion 22.

[0053] In some examples, the first cover plate 3 and the terminal 1 are respectively located on both sides of the explosion-proof structure 23. The first cover plate 3 will not affect the detachment of the terminal 1, ensuring that when the battery thermal runaway occurs, the terminal 1 can be detached together with the first connecting part 21 to achieve power-off of the battery.

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

[0055] It is understandable that one end of the first cover plate 3 is configured to protrude from the second connecting portion 22 so that the protruding portion of the first cover plate 3 can be connected to the battery housing 5, thereby facilitating the connection between the first cover plate 3 and the battery housing 5.

[0056] In some embodiments, see Figure 2 、 Figure 3 and Figure 4 The first connecting portion 21 is formed with a lap portion 212 , and the terminal 1 is formed with an extension portion 11 , which is at least partially overlapped with a side of the lap portion 212 facing away from the inner bottom wall of the housing 5 .

[0057] It is understandable that by overlapping the extension portion 11 of the terminal 1 on the side of the overlapping portion 212 facing away from the inner bottom wall of the housing 5 , the overlapping portion 212 of the first connecting portion 21 can support the terminal 1 .

[0058] It is understandable that when the battery experiences thermal runaway, the gas or pressure within the battery housing 5 will act on the explosion-proof structure 23, causing the explosion-proof structure 23 to rupture, thereby allowing the first connecting portion 21 to detach from the second connecting portion 22. When the first connecting portion 21 detaches from the second connecting portion 22, the overlapping portion 212 of the first connecting portion 21 can drive the terminal 1 to move away from the housing 5, allowing the terminal 1 to detach from the first connecting portion 21, thereby disconnecting the battery from the power supply and improving the safety of the battery.

[0059] In some embodiments, see Figure 2 、 Figure 3 and Figure 4 The cover plate assembly further includes a second cover plate 4 , which is mounted on the first connecting portion 21 .

[0060] It is understood that the second cover plate 4 can protect the first connection portion 21. At the same time, the second cover plate 4 is installed on the first connection portion 21, and the second cover plate 4 and the first cover plate 3 are spaced apart. When the battery experiences thermal runaway, the second cover plate 4 and the first connection portion 21 can be separated from the second connection portion 22 together, and the second cover plate 4 will not affect the separation of the first connection portion 21 and the terminal 1.

[0061] In some embodiments, see Figure 2 、 Figure 3 and Figure 4 The first connecting portion 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 is understood that the snap-fit ​​connection between the first connection portion 21 and the second cover plate 4 improves the connection stability between the first connection portion 21 and the second cover plate 4. Furthermore, when thermal runaway of the battery occurs, the second cover plate 4 is ensured to be able to be detached from the first connection portion 21, thereby preventing the second cover plate 4 from affecting the pressure relief of the battery.

[0063] It is understood that the snap-fit ​​connection between the first connection portion 21 and the second cover plate 4 improves the convenience of connecting the first connection portion 21 and the second cover plate 4. At the same time, it ensures that in the event of thermal runaway of the battery, the first connection portion 21 can remove the second cover plate 4 from the battery, preventing the second cover plate 4 from falling into the battery housing 5 and preventing the second cover plate 4 from affecting the pressure relief of the battery.

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

[0065] It can be understood that since the first cover plate 3 and the second cover plate 4 are not directly connected, when installing the second cover plate 4, 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, thereby achieving the positioning of the second cover plate 4. The second cover plate 4 can be fixed in the corresponding position, which is conducive to ensuring the consistency of the cover plate assembly structure.

[0066] In some embodiments, the terminal 1 is the first electrode of the battery, the first cover 3 is the second electrode of the battery, and the second cover 4 is made of 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. The terminal 1 and the first cover plate 3 are set to be charged, while the second cover plate 4 is not charged, which can increase the insulation separation effect between the terminal 1 and the first cover plate 3 to ensure the insulation of the battery.

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

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

[0070] It is understood that the raised portion 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 spaced apart and do not directly contact each other. Furthermore, when thermal runaway of the battery occurs, the detachment of the second cover plate 4 will not be interfered with or affected by the first cover plate 3, ensuring that the second cover plate 4 and the first connecting portion 21 can be smoothly detached.

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

[0072] In some embodiments, see Figure 2 、 Figure 3 and Figure 4 The body 2 includes an insulating member 26 , which has a first connecting portion 21 and a second connecting portion 22 . The insulating member 26 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 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. In other words, the insulating member 26 can completely cover the side wall surface of the terminal 1, preventing the side wall surface of the terminal 1 from being exposed, preventing the positive and negative electrodes of the cover assembly from contacting, and ensuring the insulation of the cover assembly and the battery; at the same time, the upper and lower end surfaces of the terminal 1 are not covered by the insulating member 26, which facilitates the connection between the terminal 1 and the current collecting plate, and facilitates the electrical connection between the terminal 1 and the external device.

[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 by connecting the insulating part 26, the first cover plate 3, the second cover plate 4 and the terminal 1 together by injection molding, the strength of the terminal 1 can be increased and the terminal 1 can have better torsional resistance, thereby ensuring the sealing performance of the cover plate assembly and the insulation performance of the positive and negative poles of the cover plate assembly.

[0077] It is understandable that the insulating member 26 is wrapped around the side wall surface of the terminal 1 by injection molding, which can improve the injection molding strength reliability and structural reliability and reduce the risk of leakage.

[0078] It can be understood that integrating the insulating member 26 , the first cover plate 3 , the second cover plate 4 and the terminal 1 together improves the integration of the cover plate assembly, which helps to reduce the assembly process of the battery.

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

[0080] It is understood that under the influence of the internal gas pressure of the battery, the minimum thickness of the fracture zone 231 will fracture. The minimum thickness of the fracture zone 231 can be selected based on the opening value of the explosion-proof structure of the cover assembly. The minimum thickness 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 of the fracture zone 231; the smaller the opening value of the explosion-proof structure, the smaller the minimum thickness 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, causing the opening value of the explosion-proof structure to be too high and unable to meet the use requirements. At the same time, the minimum thickness of the fracture zone 231 being greater than 0.8 mm will also cause the protrusion 25 to protrude outward from the pressure relief port 28 after the protrusion 25 is set on the main body 2, affecting 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 injection molded. Therefore, in the embodiment of the present application, the thickness of the minimum thickness area of ​​the fracture zone 231 is set to be within the range of 0.1 mm to 0.8 mm to ensure that the main body 2 can be molded by the injection molding process, and to ensure that the explosion-proof structure has a suitable opening value, and to prevent the protrusion 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 therebetween.

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

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

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

[0086] In some embodiments, along the height of the battery, the projection of the fracture zone 231 extends beyond the perimeter of the pressure relief vent 28. For example, if the pressure relief vent 28 is configured as a ring, the fracture zone 231 is also configured as a ring. The inner diameter of the fracture zone 231 is smaller than the inner diameter of the pressure relief vent 28, and the outer diameter of the fracture zone 231 is larger than the outer diameter of the pressure relief vent 28.

[0087] In some embodiments, see Figure 2 and Figure 4 The main body 2 is formed with a pressure relief port 28, the protrusion 25 is snapped into the pressure relief port 28, the fracture zone 231 is arranged close to the pressure relief port 28, the height of the protrusion 25 is H1, the height of the pressure relief port 28 is H2, and the following conditions are satisfied: H1≤H2.

[0088] It is understood that the height of the raised portion 25 is less than or equal to the height of the pressure relief opening 28 to prevent the raised portion 25 from protruding through the pressure relief opening 28 and affecting the aesthetics and pressure relief effect. If the height of the raised portion 25 is greater than the height of the pressure relief opening 28, the raised portion 25 will protrude from the surface of the body 2, which will not only affect the aesthetics of the cover assembly, but also, after the lower fracture zone 231 breaks, the raised portion 25 may continue to seal the pressure relief opening 28, affecting the pressure relief effect.

[0089] In some embodiments, the pressure relief port 28 is configured as an arc-shaped opening. The central angle of the arc-shaped opening is β, which satisfies the following relationship: 180°≤β≤360°.

[0090] It is understood that only when the central angle corresponding to the pressure relief vent 28 is greater than or equal to 180° can the body bend along the extension area of ​​the pressure relief vent 28 in a direction away from the electrode assembly, thereby ensuring that the body can deform. In the embodiment of the present application, the central angle corresponding to the arcuate opening is preferably set to 360° to form a circular pressure relief vent 28. When the cover body is subjected to the internal air pressure of the battery, the area of ​​the body located inside the arcuate opening can be pushed out by the air pressure and fall off, thereby expanding the opening size of the pressure relief vent 28.

[0091] In some embodiments, the pressure relief opening 28 can also be configured in other shapes. For example, the pressure relief opening 28 can be configured as an oval opening, a square opening, etc. It is sufficient to ensure that the pressure relief opening 28 can achieve pressure relief and that the cover plate 10 can be bent or detached along the extension area of ​​the pressure relief opening 28.

[0092] According to the embodiment of the second aspect of the present application, see Figure 6 The battery includes a shell 5, a winding core 6 and the above-mentioned cover assembly. The shell 5 is formed with a mounting cavity 51, the winding core 6 is installed in the mounting cavity 51, and the cover assembly is connected to the shell 5.

[0093] According to the battery of the embodiment of the present application, by providing the explosion-proof structure 23 at the connection between the first connection part 21 and the second connection part 22, when the battery has thermal runaway, the explosion-proof structure 23 breaks, so that the first connection part 21 can be separated from the second connection part 22 under the action of the gas or pressure generated by the thermal runaway of the battery. The first connection part 21 is connected to the terminal 1, and the terminal 1 can be separated from the second connection part 22 together with the first connection part 21, so that the terminal 1 can be separated from the current collecting plate of the battery, and the battery can be powered off. This can avoid the situation where the battery is still discharging when thermal runaway occurs, which may cause the thermal runaway to worsen, thereby 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 winding core 6 is between 0.1 and 0.5.

[0095] It is understandable that when the battery experiences thermal runaway, the explosion-proof structure 23 at the connection between the first connection part 21 and the second connection part 22 breaks, and the first connection part 21 detaches, so that the gas and pressure inside the battery can be released through the installation position of the first connection part 21.

[0096] The larger the cross-sectional area of ​​the core 6, the more gas and pressure will be generated when the battery thermally runs away. 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 when the battery thermally runs away. If the ratio of the cross-sectional area of ​​the first connecting portion 21 to the cross-sectional area of ​​the core 6 is greater than 0.5, the cross-sectional area of ​​the first connecting portion 21 is too large, which may 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 to be between 0.1 and 0.5.

[0097] In some examples, the cross-sectional area of ​​the core 6 refers to the maximum cross-sectional area of ​​the core 6. When the core 6 is cylindrical, the cross-sectional area of ​​the core 6 refers to the area of ​​the end surface of the core 6. When the core 6 is square, the core 6 has multiple surfaces, and the cross-sectional area of ​​the core 6 refers to the area of ​​the largest surface of the 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] It can be understood that the reinforcing ribs 27 can effectively improve the structural strength of the body 2 and ensure the strength of the cover 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 main body 2 facing the winding core 6.

[0101] It can be understood that the reinforcing rib 27 is connected to the side of the main body 2 facing the core 6, and the reinforcing rib 27 protrudes from the side of the main body 2 facing the core 6. In addition to improving the structural strength of the cover assembly, the reinforcing rib 27 can also form an air chamber space between the core 6 and the side of the main body 2 facing the core 6. The air chamber space can be used to accommodate the gas generated when the battery is working normally, avoiding the situation where the internal pressure of the battery is too high during normal operation, and ensuring that the battery can work normally.

[0102] In some embodiments, see 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 core 6 is installed in the installation cavity 51 of the shell 5, and the reinforcing rib 27 abuts against the end of the core 6 facing away from the inner bottom wall of the shell 5, so that the reinforcing rib 27 can fix the core 6 and improve the installation stability of the core 6 in the installation 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 is understood that when the ratio of the height of the rib 27 protruding from the side of the body 2 facing the core 6 to the height of the core 6 is greater than 0.2, the rib 27 is too high, which will have a significant impact on the size of the battery. In addition, the rib 27 will cause the air chamber formed between the core 6 and the side of the body 2 facing the core 6 to be too large. When the battery experiences thermal runaway, the explosion-proof structure 23 may not rupture in time. Therefore, this application sets the ratio of the height of the rib 27 protruding from the side of the body 2 facing the core 6 to the height of the core 6 to be less than or equal to 0.2.

[0106] In some embodiments, the explosion-proof structure 23 is arranged adjacent to or spaced apart from the reinforcing rib 27 , that is, the explosion-proof structure 23 is avoided from being arranged at the reinforcing rib 27 , ensuring that the explosion-proof structure 23 will break when thermal runaway occurs in the battery.

[0107] In some embodiments, the reinforcement rib 27 includes an annular reinforcement rib, which is disposed around the terminal 1. The annular reinforcement rib 27 can effectively strengthen the structure of the body 2.

[0108] Specifically, the number of annular reinforcement ribs is at least two, and the explosion-proof structure 23 is arranged between the two annular reinforcement ribs, that is, one of the annular reinforcement ribs is arranged at the first connecting portion 21, and the other annular reinforcement rib is arranged at the second connecting portion 22, so that the annular reinforcement ribs will not affect the rupture of the explosion-proof structure 23, ensuring that when the battery suffers thermal runaway, the explosion-proof structure 23 can be broken normally, so that the gas and pressure inside the battery can be released.

[0109] In some embodiments, the reinforcing ribs 27 include long strip reinforcing ribs connected to the annular reinforcing ribs to enhance the structural reinforcement effect on the body 2 .

[0110] Specifically, at least two annular reinforcement ribs include a first annular reinforcement rib and a second annular reinforcement rib. The first annular reinforcement rib is connected to a long strip reinforcement rib on the side away from the second annular reinforcement member, and the second annular reinforcement rib is connected to a long strip reinforcement rib on the side away from the first annular reinforcement rib, thereby effectively reinforcing the structure of the main body 2 and avoiding the provision of reinforcement ribs 27 at the explosion-proof structure 23, so that the explosion-proof structure 23 and the reinforcement ribs 27 are staggered, which can avoid the reinforcement ribs 27 from affecting the explosion-proof structure 23, and ensure that when the battery suffers thermal runaway, the explosion-proof structure 23 can be broken normally, so that the gas and pressure inside the battery can be released.

[0111] In some embodiments, the cover plate assembly is connected to the housing 5 by welding, thereby ensuring the sealing of the connection between the cover plate assembly and the housing 5 and achieving the sealing of the battery.

[0112] It is understandable that in the related art, sealing is performed by grooving and compression. Grooving stretches the shell 5, and the shell 5 wall thickness is reduced at the grooving location, reducing its strength. At the same time, the bonding force between the nickel layer and the shell 5 at the grooving location is reduced, which can easily lead to the nickel layer peeling off. The sealing ring is compressed between the shell 5 and the cover plate to seal. The compression amount of the sealing ring needs to be controlled when compressing. Insufficient compression will cause leakage risk, and it will age during long-term use, greatly increasing the risk of leakage. The cover plate will also be compressed during sealing, causing irreversible deformation, that is, the cover plate must have a certain strength to be able to seal. This embodiment skips the grooving process for sealing, which can avoid the strength reduction and nickel layer peeling caused by the grooving process, and the sealing is simpler without the need to squeeze the cover plate assembly.

[0113] According to an embodiment of the third aspect of the present application, the electrical device includes the above-mentioned battery.

[0114] According to the electrical equipment of the embodiment of the present application, by setting the explosion-proof structure 23 at the connection between the first connection part 21 and the second connection part 22, when the battery has thermal runaway, the explosion-proof structure 23 breaks, so that the first connection part 21 can be separated from the second connection part 22 under the action of the gas or pressure generated by the thermal runaway of the battery. The first connection part 21 is connected to the terminal 1, and the terminal 1 can be separated from the second connection part 22 together with the first connection part 21, so that the terminal 1 can be separated from the collecting plate of the battery, and then the battery can be powered off, which can avoid the situation where the battery is still discharging when thermal runaway occurs, causing the thermal runaway to worsen, thereby improving the safety of the battery and thus improving the safety of the electrical equipment.

[0115] It should be noted that electrical equipment can be vehicles, energy storage power supplies, consumer electronic devices, medical equipment, smart cities, aircraft, or household appliances. It should be noted that the above is merely an example of electrical equipment and does not specifically limit it.

[0116] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

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

2. The cover plate assembly according to claim 1, characterized in that: The first connecting portion is formed with a first clamping groove, and the terminal is clamped in the first clamping groove.

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

4. The cover plate assembly according to claim 3, characterized in that: Along the radial direction of the terminal, a side of the first cover plate facing away from the terminal protrudes from the second connecting portion.

5. The cover plate assembly according to claim 3, characterized in that: The first connecting portion is formed with a lap portion, the terminal is formed with an extension portion, and the extension portion is at least partially lapped on a side of the lap portion that is away from the inner bottom wall of the housing.

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

7. The cover plate assembly according to claim 6, characterized in that: The first connecting portion is formed with a second clamping groove, and the second cover plate is clamped in the second clamping groove.

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

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

10. The cover plate assembly according to claim 6, characterized in that: The body is formed with a protrusion, and the protrusion is 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 comprises an insulating member, the insulating member has the first connecting portion and the second connecting portion, and the insulating member is sleeved on the side wall surface of the terminal.

12. The cover plate assembly according to claim 11, characterized in that: The insulating member, 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 on 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 main body is formed with a pressure relief port, the protrusion is clamped on the pressure relief port, the fracture zone is arranged close to the pressure relief port, the height of the protrusion is H1, the height of the pressure relief port is H2, and the following is satisfied: 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: It comprises a shell, a winding core and a cover assembly as claimed in any one of claims 1 to 15, wherein the shell is formed with an installation cavity, the winding core is installed in the installation cavity, and the cover assembly is connected to the shell.

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 provided with reinforcing ribs.

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

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

21. The battery according to claim 18, characterized in that Along the axial direction of the shell, the ratio of the height of the reinforcing rib protruding from the side of the main body facing the winding core to the height of the winding core is less than or equal to 0.

2.

22. An electrical equipment, characterized in that: Comprising a battery as claimed in any one of claims 16 to 21.

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