Cover plate structure and battery

Abstract

The utility model relates to the technical field of batteries, and provides a cover plate structure and a battery, the cover plate structure comprises a first plate body, a second plate body and a pole column assembly, the first plate body is provided with a mounting hole, the second plate body is connected to the first plate body, the second plate body comprises a supporting part, the supporting part extends into the mounting hole, and the pole column assembly is arranged in the mounting hole. The pole assembly comprises a pole, a sealing assembly and an insulating assembly which are integrally formed, the sealing assembly and the insulating assembly are arranged on the periphery of the pole, and the pole assembly is arranged in the mounting hole and supported above the supporting part. According to the embodiment of the invention, the structure can be simplified, the cost can be controlled, and the safety performance of the lithium ion battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate structure and a battery. Background Art

[0002] Lithium-ion batteries are widely used in new energy, consumer electronics, wearable electronic devices and other fields due to their advantages such as high energy density, long cycle life and high safety.

[0003] Lithium-ion batteries typically include a casing, a pole core, and a cover structure, wherein the pole core is disposed in the casing, the cover structure is connected to the end of the casing and seals the pole core in the casing, and a pole needs to be provided on the cover structure, which can form a connection with the pole core. To ensure the safety performance of the lithium-ion battery, the cover structure also needs to be provided with necessary insulating structures and sealing structures around the pole to separate the pole from other parts of the cover structure. Therefore, on the one hand, this will lead to the problems of complex structure and high cost of the cover structure. On the other hand, since the insulating structure and the sealing structure surround the pole, it is easy to cause the pole to sink, affecting the safety performance of the lithium-ion battery. Utility Model Content

[0004] The present application provides a cover plate structure and a battery, which can simplify the structure and control the cost, and can also improve the safety performance of the lithium-ion battery.

[0005] A first aspect of the present application provides a cover plate structure, comprising:

[0006] A first plate body having a mounting hole;

[0007] a second plate body connected to the first plate body, the second plate body comprising a support portion, the support portion extending into the mounting hole;

[0008] and a pole assembly, the pole assembly comprising an integrally formed pole, a sealing assembly and an insulating assembly, the sealing assembly and the insulating assembly being arranged on the periphery of the pole, the pole assembly being arranged in the mounting hole and supported above the support portion.

[0009] According to the cover plate structure described in the first aspect of the present application, the pole, sealing component and insulating component are formed into a pole assembly by an integrated molding method, which can simplify the structure and control costs. The supporting effect of the supporting part on the pole assembly can prevent the pole assembly from sinking, which can improve the safety performance of the battery.

[0010] In a possible implementation, the support portion includes a support body and a limiting structure connected to the support body, a mounting cavity is formed between the limiting structure and the first plate, and the pole assembly is mounted in the mounting cavity.

[0011] In a possible implementation, the limiting structure includes a first engaging portion, and a second engaging portion is formed on one side of the pole assembly located in the installation cavity, and the second engaging portion can be engaged with the first engaging portion.

[0012] In a possible implementation, the sealing assembly is supported on the supporting portion, the sealing assembly includes a sealing member, and the pole is arranged on an inner side of the sealing member.

[0013] In one possible implementation, the sealing assembly further includes a bracket, and the sealing member is connected to the bracket.

[0014] In one possible implementation, the bracket includes a first extension arm and a second extension arm, the insulating assembly includes a first insulating member, the first insulating member is wrapped around the outer periphery of the first extension arm and the first insulating member is located between the pole and the first plate, and the second extension arm forms the support portion.

[0015] In one possible implementation, the insulating assembly further includes a second insulating member, which is disposed at the bottom of the pole, disposed on the inner side of the sealing member, and supported on the top end of the first engaging portion.

[0016] In one possible implementation, a pressure relief hole is provided on the first plate body, a pressure relief cavity connected to the pressure relief hole is formed on the second plate body, and the cover plate structure further includes an explosion-proof structure, which is provided at the pressure relief hole.

[0017] In one possible implementation, the second plate body is retracted inwardly relative to the first plate body along the circumferential direction.

[0018] In a possible implementation manner, the support portion forms surface contact with the pole assembly.

[0019] In one possible implementation, the second plate body is arranged in close contact with the first plate body.

[0020] A second aspect of the present application provides a battery, comprising the cover plate structure described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0022] Figure 1A schematic structural diagram of a cover plate structure provided according to an embodiment of the present application is shown;

[0023] Figure 2 A structural schematic diagram showing another angle of a cover plate structure provided according to an embodiment of the present application is shown;

[0024] Figure 3 An exploded schematic diagram of a cover plate structure provided according to an embodiment of the present application is shown;

[0025] Figure 4 A cross-sectional view of a cover plate structure provided according to an embodiment of the present application is shown;

[0026] Figure 5 Shown Figure 4 A schematic diagram of the partial enlargement of part A in the middle.

[0027] Reference numerals:

[0028] 100 - first plate; 101 - mounting hole; 102 - mounting cavity; 103 - pressure relief hole;

[0029] 200 - second plate; 201 - pressure relief chamber; 210 - support portion; 220 - raised structure; 230 - spacer reinforcement ribs; 211 - support body; 212 - position limiting structure; 2121 - first engaging portion;

[0030] 300 - pole assembly; 301 - connection end; 302 - second engaging portion; 310 - pole; 320 - sealing assembly; 330 - insulating assembly; 311 - connecting portion; 312 - conductive portion; 321 - sealing member; 322 - bracket; 331 - first insulating member; 332 - second insulating member; 3211 - first sealing portion; 3212 - second sealing portion; 3221 - first extending arm; 3222 - second extending arm;

[0031] 400-explosion-proof structure; 410-explosion-proof valve; 420-protective sheet. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] In recent years, with the rapid development of new energy technologies, lithium-ion batteries have also been undergoing a period of rapid development. Lithium-ion batteries are undergoing continuous optimization and innovation in terms of material selection, process manufacturing, and structural design. The main challenges facing lithium-ion battery design are capacity, safety, and lifespan. With the continuous exploration of materials, processes, and structures, lithium-ion battery performance has been continuously improved. This is mainly reflected in the advantages of lithium-ion batteries such as high energy density, long cycle life, and high safety. Therefore, lithium-ion batteries are often used in a variety of fields, including new energy, consumer electronics, and wearable electronic devices.

[0034] Lithium-ion batteries typically include a housing, a core, and a cover structure. The housing is typically made of metal, such as aluminum, to enhance the battery's structural stability and its ability to withstand pressure and impact. The core is the core component of a lithium-ion battery, capable of storing or releasing electrical energy. It typically includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet contains a positive active material containing lithium, while the negative electrode sheet contains a negative active material capable of interacting with lithium ions. Lithium-ion batteries rely on the interaction of lithium ions between the positive and negative electrodes to achieve charging and discharging, thereby storing and releasing electrical energy. The cover structure is connected to the end of the housing. Its primary function is to enclose the core within the housing and to form an electrical connection with the core. Therefore, the cover structure typically requires a post, which connects to the tab on the core. The post can be exposed from the cover structure, forming the positive or negative electrode of the lithium-ion battery.

[0035] At present, when designing the cover structure, in order to ensure the overall structural strength of the cover structure, the main part of the cover structure is usually made of metal materials, such as aluminum. In order to prevent a short circuit between the pole and the main part of the cover structure, an insulating structure needs to be provided between the main part and the pole to form insulation between the main part and the pole. At the same time, in order to ensure the connection reliability between the pole and the main part, a sealing structure also needs to be provided between the main part and the pole.

[0036] Due to the arrangement of the above-mentioned insulating structure and sealing structure, the cover structure as a whole has the problems of complex structure and high cost. On the other hand, since the sealing structure and the insulating structure are usually made of materials such as plastic, these materials are easily deformed during use, thereby causing the pole to sink and affecting the safety performance of the lithium-ion battery.

[0037] Based on the above status quo and problems, an embodiment of the present application provides a cover plate structure, which is provided with an integrated pole assembly, which can simplify the structure and control costs. At the same time, the cover plate structure is also provided with a support structure that can support the pole assembly, thereby preventing the pole from sinking, thereby improving the safety performance of the lithium-ion battery.

[0038] An embodiment of the present application also provides a battery, which includes the above-mentioned cover structure, and the cover structure can be connected to the battery casing, which can reduce the manufacturing cost of the battery and improve the safety performance of the battery.

[0039] Figure 1 A schematic structural diagram of a cover plate structure provided according to an embodiment of the present application is shown; Figure 2 A structural schematic diagram showing another angle of a cover plate structure provided according to an embodiment of the present application is shown;

[0040] Figure 3 An exploded schematic diagram of a cover plate structure provided according to an embodiment of the present application is shown; Figure 4 A cross-sectional view of a cover plate structure provided according to an embodiment of the present application is shown; Figure 5 Shown Figure 4 A schematic diagram of the partial enlargement of part A in the middle.

[0041] In the examples of this application, please refer to Figures 1 to 5 The cover plate structure includes a first plate body 100 , a second plate body 200 and a pole assembly 300 .

[0042] The first plate 100 has a mounting hole 101, into which the pole assembly 300 can be mounted. To enhance the overall strength of the structure, the first plate 100 can be made of a metal material such as aluminum, and the mounting hole 101 can be formed in the first plate 100 through machining. The shape and size of the mounting hole 101 are not particularly limited; it should be understood that the shape and size of the mounting hole 101 can be set according to actual needs. For example, the mounting hole 101 can be a circular hole or a rectangular hole.

[0043] The second plate body 200 is connected to the first plate body 100. The second plate body 200 can form a stacked structure with the first plate body 100. The second plate body 200 and the first plate body 100 constitute the main part of the cover structure. The second plate body 200 can also be made of metal materials such as aluminum, thereby improving the overall strength of the cover structure. Of course, in some embodiments, the second plate body 200 can also be made of pressure-resistant and high-temperature resistant polymer materials.

[0044] In some embodiments, the first plate body 100 and the second plate body 200 can be connected by mechanical connection or by welding. For the former, for example, threaded holes can be set on the first plate body 100 and the second plate body 200, and then bolts can be installed in the threaded holes. For the latter, for example, laser welding can be used to achieve the connection between the first plate body 100 and the second plate body 200.

[0045] In some embodiments, please refer to Figure 4 and Figure 5 The second plate body 200 is fitted with the first plate body 100 , which can enhance the structural strength of the first plate body 100 and the second plate body 200 as the main body.

[0046] The second plate 200 includes a support portion 210 that extends into the mounting hole 101. In a specific design, the second plate 200 can be connected to the bottom of the first plate 100, with the mounting hole 101 located above the second plate 200. After the support portion 210 on the second plate 200 extends into the mounting hole 101, the pole assembly 300 installed in the mounting hole 101 can be supported by the support portion 210.

[0047] It is understandable that, based on the presence of the support portion 210 , the pole assembly 300 is not likely to move toward the inside of the mounting hole 101 during use, thereby preventing the pole assembly 300 from sinking, thereby improving the safety performance of the battery.

[0048] The support portion 210 may be formed by certain structures of the second plate 200 . For example, the support portion 210 may be obtained by processing the edge of the second plate 200 . The support portion 210 may also be connected to the second plate 200 by mechanical connection.

[0049] The pole assembly 300 is manufactured in an integrally formed manner. For example, the pole assembly 300 may include a pole 310, a sealing assembly 320, and an insulating assembly 330. The pole 310, the sealing assembly 320, and the insulating assembly 330 may be integrally injection molded so that the pole 310, the sealing assembly 320, and the insulating assembly 330 are connected as one, with high structural strength and a more compact structure.

[0050] Forming the pole assembly 300 in an integrated manner can simplify the structural composition of the pole assembly 300 and reduce the manufacturing cost of the pole assembly 300 .

[0051] In an embodiment of the present application, the pole 310, the sealing assembly 320 and the insulating assembly 330 are formed into an integrally formed pole assembly 300, which can simplify the structure and control costs. The supporting effect of the support portion 210 on the pole assembly 300 can prevent the pole assembly 300 from sinking, thereby improving the safety performance of the battery.

[0052] In some embodiments, please refer to Figures 3 to 5 The support portion 210 includes a support body 211 and a limiting structure 212 connected to the support body 211 . An installation cavity 102 is formed between the limiting structure 212 and the first plate 100 , and the pole assembly 300 is installed in the installation cavity 102 .

[0053] It can be understood that the installation cavity 102 is an open cavity structure. One side of the installation cavity 102 has an opening, and the pole assembly 300 can be installed in the installation cavity 102 through the opening.

[0054] In the above embodiment, the mounting cavity 102 can restrict the pole assembly 300 , so that the pole assembly 300 can be stably installed in the mounting cavity 102 .

[0055] It is understood that the pole assembly 300 is formed with a connection end 301, and the connection end 301 may have a structure and size that matches the installation cavity 102. For example, Figure 5 In the example shown, the mounting cavity 102 is substantially square, and accordingly, the connecting end 301 can also be designed as a square structure. In other embodiments, the mounting cavity 102 can also be of other shapes, and the connecting end 301 can also be changed accordingly.

[0056] In some specific embodiments, please refer to Figure 5 The limiting structure 212 includes a first engaging portion 2121 , and a second engaging portion 302 is formed on one side of the pole assembly 300 located in the installation cavity 102 . The second engaging portion 302 can be engaged with the first engaging portion 2121 .

[0057] Specifically, the second locking portion 302 can be formed at the connecting end 301 of the pole assembly 300, and the first locking portion 2121 is located at the top position of the limiting structure 212. The first locking portion 2121 can limit the pole assembly 300 above the connecting end 301. The first plate body 100 and the limiting structure 212 can limit the pole assembly 300 on the left and right sides of the pole assembly 300, thereby improving the stability of the pole assembly 300 in the installation cavity 102.

[0058] by Figure 5Taking the shown orientation as an example, the connection end 301 of the pole assembly 300 is restricted in the installation cavity 102. In the X direction, the right edge of the first plate body 100 and the left edge of the limiting structure 212 can respectively restrict the left and right sides of the connection end 301. In the Y direction, the first clamping portion 2121 can form a clamping engagement with the second clamping portion 302 on the connection end 301, thereby restricting the connection end 301 on the upper side in the Y direction, and the support body 211 can restrict the connection end 301 on the lower side in the Y direction. As a result, the pole assembly 300 can be stably restricted in the installation cavity 102.

[0059] In some embodiments, the support body 211 may circumferentially surround the mounting hole 101. In this case, the support body 211 is a continuous structure along the circumference. In other embodiments, the support body 211 may also be designed as a discontinuous intermittent structure.

[0060] In some embodiments, combined with the above-mentioned continuous structure of the support body 211, the limiting structure 212 can also be designed as a continuous structure, that is, the limiting structure 212 is arranged around the mounting hole 101. Of course, the limiting structure 212 can also be designed as an intermittent structure.

[0061] In some embodiments, please refer to Figures 3 to 5 The sealing assembly 320 is supported on the support portion 210 . The sealing assembly 320 includes a sealing member 321 . The pole 310 is disposed inside the sealing member 321 .

[0062] The sealing assembly 320 supports the pole 310 and the insulating assembly 330. The sealing assembly 320 also needs to form a seal between the pole 310 and the first plate 100 and / or the second plate 200. Therefore, the sealing assembly 320 may include a bracket 322 and a sealing member 321. The bracket 322 may be made of a material with high structural strength, such as aluminum or other metal materials, to enhance the structural strength of the sealing assembly 320. The sealing member 321 may be made of rubber, silicone, or other materials to seal the gap between the pole 310 and the first plate 100 and the second plate 200 through elastic deformation of the sealing member 321. As can be seen from the following embodiments, the main function of the sealing member 321 is to form a seal between the bracket 322 and the pole 310. By connecting the sealing assembly 320 to the mounting cavity 102 by welding, a seal between the sealing assembly 320 and the first plate 100 and a seal between the sealing assembly 320 and the second plate 200 can be achieved.

[0063] The specific structure of the bracket 322 is not limited. Taking the connecting end 301 forming a square structure as an example, the bracket 322 can be designed so that at least its end portion has a square structure. In other embodiments, the bracket 322 can also be designed into other structures.

[0064] The seal 321 may be an annular structure. When the pole 310 is disposed inside the seal 321 , the seal 321 may circumferentially surround the pole 310 , thereby forming a seal between the pole 310 and the bracket 322 .

[0065] In some specific embodiments, please refer to Figure 5 The seal 321 may include a first sealing portion 3211 and a second sealing portion 3212 . The first sealing portion 3211 and the second sealing portion 3212 may respectively seal the two surfaces of the pole 310 , thereby improving the sealing effect of the seal 321 .

[0066] In some specific embodiments, the seal 321 may be designed to include a groove so that the seal 321 can be wrapped around the outside of the pole 310, for example, Figure 5 In the example shown, the pole 310 includes a connecting portion 311 and a conductive portion 312, wherein the connecting portion 311 extends from the bottom edge of the conductive portion 312, and the sealing member 321 can be covered on the connecting portion 311.

[0067] In some embodiments, please refer to Figure 5 The bracket 322 includes a first extension arm 3221 and a second extension arm 3222 .

[0068] The first extension arm 3221 and the second extension arm 3222 form an angle, which can be an acute angle, a right angle, or an obtuse angle. For example, the angle is a right angle. The bracket 322, including the first extension arm 3221 and the second extension arm 3222, serves three primary functions: first, providing insulation between the pole 310 and the first plate 100; second, providing insulation between the pole 310 and the second plate 200; and third, enabling the integrated connection of the pole 310, the insulation assembly 330, and the sealing assembly 320.

[0069] Please refer to Figure 5 The insulating assembly 330 includes a first insulating member 331 , which is wrapped around the outer periphery of the first extension arm 3221 and is located between the pole 310 and the first plate 100 .

[0070] Specifically, the first extension arm 3221 extends vertically upward, that is, extends along the Y direction. The first extension arm 3221 can extend from the installation cavity 102 to the outside of the first plate body 100. By arranging a first insulating member 331 around the first extension arm 3221, the first insulating member 331 covers the first extension arm 3221 and the first insulating member 331 is simultaneously connected to the first plate body 100 and the pole 310. Insulation between the first plate body 100 and the pole 310 can be achieved on the outside of the cover structure. At the same time, the covering design of the first insulating member 331 on the first extension arm 3221 can improve the connection strength between the first insulating member 331, the first extension arm 3221 and the pole 310.

[0071] The second extension arm 3222 can form the aforementioned connection end 301, and the second extension arm 3222 can be supported on the support portion 210. The insulating assembly 330 also includes a second insulating member 332, and the second insulating member 332 is arranged at the bottom of the pole 310. The second insulating member 332 is arranged on the inner side of the sealing member 321, and the second insulating member 332 is supported on the top of the first clamping portion 2121.

[0072] Specifically, the second extension arm 3222 extends horizontally, that is, extends along the X direction. The second insulating member 332 is provided between the pole 310 and the first engaging portion 2121 to achieve insulation between the second plate 200 and the pole 310 on the inner side of the cover structure.

[0073] Therefore, the above embodiment can achieve insulation between the first plate body 100 and the pole 310 on the outside of the cover structure, achieve insulation between the second plate body 200 and the pole 310 on the inside of the cover structure, and ensure the integrated connection of the pole assembly 300 through the structure and coordination of the bracket 322, the insulating assembly 330 and the sealing assembly 320.

[0074] In some other embodiments, a gap may be formed between the first engaging portion 2121 and the pole 310. In this case, the insulation between the pole 310 and the second plate 200 may be achieved without providing the second insulating member 332.

[0075] The above embodiment has made a detailed description of the pole assembly 300 and its installation. In order to further understand the structure and working mechanism of the pole assembly 300, the following will be combined with Figures 3 to 5Some embodiments of the pole assembly 300 are described. The following content will mainly relate to the assembly process of the pole assembly 300 and the installation of the pole assembly 300 on the first plate 100 and the second plate 200. The pole assembly 300 in these embodiments mainly includes a pole 310, an insulating assembly 330 and a sealing assembly 320, wherein the pole 310 includes a connecting portion 311 and a conductive portion 312, and the connecting portion 311 extends from the bottom edge of the conductive portion 312. The sealing assembly 320 includes a bracket 322 and a seal 321, and the bracket 322 has a first extension arm 3221 and a second extension arm 3222 arranged vertically. The seal 321 includes a first sealing portion 3211 and a second sealing portion 3212, and the seal 321 is arranged at the corners of the bracket 322. The insulating assembly 330 includes a first insulating member 331 and a second insulating member 332.

[0076] Please refer to Figures 3 to 5 The pole 310, the sealing assembly 320 and the insulating assembly 330 can be connected into one body by integral injection molding. During injection molding, the bracket 322, the sealing ring, the second insulating member 332 and the pole 310 can be pre-buried in a specified mold. A casting cavity can be formed between the mold and the integral structure composed of the bracket 322, the sealing ring and the pole 310. The shape of the casting cavity is the same as that of the first insulating member 331. By injecting casting liquid into the casting cavity and letting it stand for a period of time, the casting liquid is cooled and becomes solid, and the mold is disassembled to form an integrated structure pole assembly 300. Of course, in other embodiments, injection molding can also be completed by setting inserts. In this case, the bracket 322 and the pole 310 can be pre-buried in a specified mold according to a specified positional relationship. Inserts can be set at positions corresponding to the first insulating member 331, the sealing ring, and the second insulating member 332. By injecting casting liquid into the mold and letting it stand for a period of time, the casting liquid is cooled and becomes solid, and the mold is disassembled to form an integrated structure pole assembly 300.

[0077] In the above-mentioned pole assembly 300, the second insulating member 332 and the connecting portion 311 of the pole 310 are located on the inner side of the sealing member 321. The sealing member 321, the second insulating member 332 and the connecting portion 311 of the pole 310 can be clamped between the first insulating member 331 and the second extending arm 3222 of the bracket 322, thereby improving the structural strength and connection reliability of the pole assembly 300.

[0078] After the pole assembly 300 is formed, the first extension arm 3221 of the bracket 322 can be installed in the installation cavity 102. Due to the existence of the first clamping portion 2121, a force can be generated on the pole assembly 300 by mechanical pressing, so that the second clamping structure can push the first clamping structure to deform. When the second clamping structure passes over the first clamping structure, the first clamping structure can be reset and fixed with the first clamping structure, and then the bracket 322 is welded to the first plate 100 and the second plate 200 by laser welding.

[0079] During the assembly process of the pole assembly 300 and the installation process of the pole assembly 300 on the first plate 100 and the second plate 200, it can be seen that the assembly process of the pole assembly 300 can be mainly manufactured by an integral injection molding method. It can be understood that before injection molding, the various components of the pole assembly 300 can be manufactured separately. During injection molding, they can be placed into the specified mold according to the positional relationship of the components. The pole assembly 300 is installed on the first plate 100 and the second plate 200 mainly through mechanical pressing and laser welding. Among them, mechanical pressing can achieve the fixation between the first clamping structure 2121 and the second clamping structure 302, and laser welding can achieve the connection between the bracket 322 and the first plate 100 and the second plate 200. The embodiment of the present application can form a pole assembly 300 and a cover plate structure with stable structure and reliable strength through the combination of the above processes. At the same time, the above processes are also easy to operate.

[0080] In some embodiments, to improve the connection reliability of the pole assembly 300 , the support portion 210 forms surface contact with the pole assembly 300 , which is conducive to forming a uniform weld between the support portion 210 and the pole assembly 300 .

[0081] In some embodiments, please refer to Figures 1 to 2 and Figures 4 and 5 The second plate body 200 is retracted circumferentially relative to the first plate body 100. When the battery is assembled, the battery shell can abut against the outer edge of the second plate body 200. The shell can form a flush structure with the first plate body 100, which can improve the connection reliability between the cover structure and the shell.

[0082] In some embodiments, please refer to Figure 1 、 Figure 3 and Figure 4 A pressure relief hole 103 is provided on the first plate body 100 , and a pressure relief cavity 201 communicating with the pressure relief hole 103 is formed on the second plate body 200 . The cover plate structure also includes an explosion-proof structure 400 , which is provided at the pressure relief hole 103 .

[0083] The explosion-proof structure 400 is used to promptly discharge the high-temperature gas inside the battery through the explosion-proof structure 400 when the battery experiences thermal runaway.

[0084] The explosion-proof structure 400 includes an explosion-proof valve 410 and a protective plate 420. The protective plate 420 is located above the explosion-proof valve 410. The explosion-proof valve 410 is provided with a weak link. The weak link can be formed, for example, by a thinner portion of the explosion-proof valve 410 or by providing a structure with lower structural strength at certain locations on the explosion-proof valve 410. In the event of thermal runaway, high-temperature gas can break through the weak link, thereby relieving pressure. The protective plate 420 located above the explosion-proof valve 410 can protect the explosion-proof valve 410 and prevent damage to the explosion-proof valve 410 by external debris.

[0085] In some specific embodiments, please refer to Figure 2 and Figure 3 The second plate 200 protrudes downward to form a protruding structure 220, which forms the aforementioned pressure relief chamber 201. The formation of the aforementioned pressure relief chamber 201 by the protruding structure 220 can increase the volume of the pressure relief chamber 201. When the battery undergoes thermal runaway, the pressure relief chamber 201 can retain more high-temperature gas, which can prevent the explosion-proof valve 410 from being immediately opened due to instantaneous high temperature, providing a buffer time for the pressure relief work, thereby protecting the battery.

[0086] In some specific embodiments, please refer to Figure 2 and Figure 3 The upper and lower sides of the pressure relief chamber 201 are both provided with spacer reinforcement ribs 230. The spacer reinforcement ribs 230 can improve the structural strength of the second plate body 200 at the pressure relief chamber 201. At the same time, through the setting of the spacer reinforcement ribs 230, the high-temperature gas can also be diverted, so that the high-level gas can more gently break open the explosion-proof valve 410 during pressure relief, and can also prevent the explosion-proof valve 410 from being broken open due to excessive local high-temperature gas.

[0087] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0088] In the description of this application, it should be understood that the terms "including" and "having" and any variations thereof used in the embodiments of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0089] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc. should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration. They can be directly connected or indirectly connected through an intermediate medium. They can also refer to internal connections between two elements or interactions between two elements. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate structure, characterized in that: include: A first plate body having a mounting hole; a second plate body connected to the first plate body, the second plate body comprising a support portion, the support portion extending into the mounting hole; and a pole assembly, the pole assembly comprising an integrally formed pole, a sealing assembly and an insulating assembly, the sealing assembly and the insulating assembly being arranged on the periphery of the pole, the pole assembly being arranged in the mounting hole and supported above the support portion.

2. The cover plate structure according to claim 1, characterized in that: The support portion includes a support body and a limiting structure connected to the support body. A mounting cavity is formed between the limiting structure and the first plate body, and the pole assembly is mounted in the mounting cavity.

3. The cover plate structure according to claim 2, characterized in that: The limiting structure includes a first engaging portion, and a second engaging portion is formed on one side of the pole assembly located in the installation cavity, and the second engaging portion can be engaged with the first engaging portion.

4. The cover plate structure according to claim 3, characterized in that: The sealing assembly is supported on the supporting portion, and the sealing assembly includes a sealing member. The pole is arranged inside the sealing member.

5. The cover plate structure according to claim 4, characterized in that: The sealing assembly further includes a bracket, and the sealing member is connected to the bracket.

6. The cover plate structure according to claim 5, characterized in that: The bracket includes a first extension arm and a second extension arm. The insulating assembly includes a first insulating member. The first insulating member is wrapped around the outer periphery of the first extension arm and is located between the pole and the first plate. The second extension arm forms the supporting portion.

7. The cover plate structure according to claim 6, characterized in that: The insulating assembly further includes a second insulating member, which is disposed at the bottom of the pole, the second insulating member is disposed on the inner side of the sealing member, and the second insulating member is supported on the top end of the first clamping portion.

8. The cover plate structure according to any one of claims 1 to 7, characterized in that: The first plate body is provided with a pressure relief hole, the second plate body is formed with a pressure relief cavity connected with the pressure relief hole, and the cover plate structure further includes an explosion-proof structure, which is provided at the pressure relief hole.

9. The cover plate structure according to any one of claims 1 to 7, characterized in that: The second plate body is retracted inwardly relative to the first plate body along the circumferential direction.

10. The cover plate structure according to any one of claims 1 to 7, characterized in that: The support portion is in surface contact with the pole assembly.

11. The cover plate structure according to any one of claims 1 to 7, characterized in that: The second plate body is arranged in close contact with the first plate body.

12. A battery, characterized in that: The invention comprises the cover plate structure according to any one of claims 1 to 11.

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