Top cover assembly and steel shell cylindrical battery

Abstract

The application provides a top cover assembly and a steel shell cylindrical battery. The top cover assembly comprises an aluminum top cover, an explosion-proof sheet, a conductive connecting plate and an insulating washer. The aluminum top cover is formed with a gas outlet hole. The explosion-proof sheet is arranged on one side of the aluminum top cover and covers the outer periphery of the aluminum top cover. A pressure relief cavity is formed between the explosion-proof sheet and the aluminum top cover, and the pressure relief cavity is communicated with the gas outlet hole. The explosion-proof sheet is formed with a pressure relief turning part, and an explosion-proof safety groove is arranged on the side of the pressure relief turning part away from the pressure relief cavity. The pressure relief turning part is used for deforming towards the aluminum top cover when subjected to a first predetermined pressure, and the explosion-proof safety groove is used for cracking when the pressure relief turning part deforms. The conductive connecting plate is formed with a spot welding hole, and the conductive connecting plate is welded to the pressure relief turning part through the spot welding hole, so that the conductive connecting plate is used for electrically connecting with the pressure relief turning part when the pressure is less than the first predetermined pressure. The insulating washer is arranged between the conductive connecting plate and the explosion-proof sheet, so that a gap exists between the conductive connecting plate and the explosion-proof sheet.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a top cover assembly and a steel-cased cylindrical battery. Background Technology

[0002] Traditional steel-cased cylindrical battery top cover assemblies use a steel structure. When assembling them, welding is required to attach the top cover of one of the two adjacent steel-cased cylindrical batteries to the steel casing of the other, thus assembling the two adjacent steel-cased cylindrical batteries. Specifically, resistance welding is generally used for spot welding. Due to the small weld points, poor welding may occur at the weld joints of the assembly, resulting in lower tensile strength at the weld joints. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a top cover assembly and a steel-cased cylindrical battery with high tensile strength at the welded joints.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] A top cover assembly, comprising:

[0006] The aluminum top cover has ventilation holes.

[0007] An explosion-proof sheet is disposed on one side of the aluminum top cover, and the explosion-proof sheet covers the outer periphery of the aluminum top cover; a pressure relief cavity is formed between the explosion-proof sheet and the aluminum top cover, the pressure relief cavity is connected to the vent hole, the explosion-proof sheet has a pressure relief flip-over part, and an explosion-proof safety groove is provided on the side of the pressure relief flip-over part opposite to the pressure relief cavity; the pressure relief flip-over part is used to deform towards the aluminum top cover when subjected to a first predetermined pressure, and the explosion-proof safety groove is used to crack when the pressure relief flip-over part deforms;

[0008] A conductive connecting plate is formed with spot welding holes. The conductive connecting plate is welded to the pressure relief flip-off part through the spot welding holes, so that the conductive connecting plate is used to electrically connect with the pressure relief flip-off part when the pressure is less than the first predetermined pressure.

[0009] An insulating washer is disposed between the conductive connecting plate and the explosion-proof sheet, so that there is a gap between the conductive connecting plate and the explosion-proof sheet.

[0010] In one embodiment, the aluminum top cover is an aluminum nail cover.

[0011] In one embodiment, the aluminum top cover includes a steel top cover sheet and an aluminum top cover sheet, the vent is formed on the steel top cover sheet, the aluminum top cover sheet is connected to the steel top cover sheet, and the aluminum top cover sheet is at least partially located on the side of the steel top cover sheet opposite to the conductive connecting plate, and the explosion-proof sheet covers the outer periphery of the steel top cover sheet.

[0012] In one embodiment, the aluminum top cover sheet and the steel top cover sheet are stacked together.

[0013] In one embodiment, the aluminum top cover extends from the top surface of the steel top cover to the edge of the steel top cover, the aluminum top cover has a clearance hole that corresponds to and communicates with the vent hole, and the explosion-proof sheet also covers the outer periphery of the aluminum top cover.

[0014] In one embodiment, there are multiple clearance holes and multiple vent holes, and the multiple clearance holes and multiple vent holes are connected in a one-to-one correspondence.

[0015] In one embodiment, the aluminum top cover sheet includes an aluminum top cover sheet body and a fixing part. The aluminum top cover sheet body is disposed on the side of the steel top cover sheet opposite to the conductive connecting plate, and the fixing part passes through the vent hole and is connected to the steel top cover sheet.

[0016] In one embodiment, there are multiple air outlets and multiple fixing parts, with each fixing part corresponding to one of the multiple air outlets.

[0017] In one embodiment, the plurality of said fixing parts are welded together; or,

[0018] Each of the fixing parts forms a first bent welded part and a second bent welded part. Each of the aluminum top cover plates covers the convex top of the steel top cover plate. The first bent welded part passes through and is bent and fixed to one of the air outlets, and the second bent welded part passes through and is bent and fixed to the other air outlet.

[0019] A cylindrical battery with a steel casing includes the top cover assembly described in any of the above embodiments.

[0020] Compared with the prior art, the present invention has at least the following advantages:

[0021] 1. The aforementioned top cover assembly is used to assemble and connect to the steel shell. Since the aluminum top cover has a vent, the explosion-proof plate is located on one side of the aluminum top cover and covers the outer periphery of the aluminum top cover. A pressure relief chamber is formed between the explosion-proof plate and the aluminum top cover. The pressure relief chamber is connected to the vent. When the air pressure inside the steel shell reaches the first predetermined pressure, that is, when the pressure relief flipping part is subjected to the first predetermined pressure, the pressure relief flipping part automatically deforms towards the aluminum top cover, causing the conductive connecting plate to separate from the pressure relief flipping part at the spot welding hole. In addition, an insulating gasket is provided between the conductive connecting plate and the explosion-proof plate to ensure that the conductive connecting plate and the pressure relief flipping part are de-energized. Furthermore, when the air pressure inside the steel shell increases further, the pressure relief flipping part automatically cracks at the explosion-proof safety groove, and the air pressure inside the steel shell can be released through the pressure relief chamber and the vent, thus playing a role in safety and explosion protection.

[0022] 2. Since the top of the top cover assembly is made of aluminum, during group welding, the aluminum top cover of one of the two adjacent steel-cased cylindrical batteries can be welded to the steel casing of the other steel-cased cylindrical battery, achieving reliable welding and fixing, and solving the problem of low tensile strength at the weld joint of the group. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional schematic diagram of the assembly of a top cover assembly according to one embodiment;

[0025] Figure 2 for Figure 1 A cross-sectional view of the aluminum top cover of the top cover assembly shown;

[0026] Figure 3 for Figure 2 Another perspective view of the steel top cover plate of the aluminum top cover shown;

[0027] Figure 4 for Figure 3 A schematic diagram of the steel top cover plate from another perspective;

[0028] Figure 5 for Figure 3 A schematic diagram of the steel top cover plate from another perspective;

[0029] Figure 6 A schematic diagram of an aluminum top cover sheet for a top cover assembly according to another embodiment;

[0030] Figure 7 for Figure 6 The diagram shows the aluminum top cover plate assembled onto the steel top cover plate.

[0031] Figure 8 for Figure 7 A schematic diagram from another perspective showing the aluminum top cover plate assembled on the steel top cover plate;

[0032] Figure 9 This is a schematic diagram of an aluminum top cover sheet of a top cover assembly according to yet another embodiment;

[0033] Figure 10 for Figure 9 The diagram shows an aluminum top cover plate assembled onto a steel top cover plate. Detailed Implementation

[0034] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] This application provides a top cover assembly including an aluminum top cover, an explosion-proof sheet, a conductive connecting plate, and an insulating gasket; the aluminum top cover has a vent hole; the explosion-proof sheet is disposed on one side of the aluminum top cover and covers the outer periphery of the aluminum top cover; a pressure relief cavity is formed between the explosion-proof sheet and the aluminum top cover, the pressure relief cavity is connected to the vent hole, the explosion-proof sheet has a pressure relief flip-over portion, and an explosion-proof safety groove is formed on the side of the pressure relief flip-over portion opposite to the pressure relief cavity; the pressure relief flip-over portion is used to deform towards the aluminum top cover when subjected to a first predetermined pressure, and the explosion-proof safety groove is used to crack when the pressure relief flip-over portion deforms; the conductive connecting plate has spot welding holes, and the conductive connecting plate is welded to the pressure relief flip-over portion through the spot welding holes, so that the conductive connecting plate is electrically connected to the pressure relief flip-over portion when the pressure is less than the first predetermined pressure; the insulating gasket is disposed between the conductive connecting plate and the explosion-proof sheet, so that there is a gap between the conductive connecting plate and the explosion-proof sheet.

[0038] The aforementioned top cover assembly is used for assembly and connection to the steel shell. Since the aluminum top cover has vent holes, an explosion-proof plate is located on one side of the aluminum top cover and covers its outer periphery. A pressure relief chamber is formed between the explosion-proof plate and the aluminum top cover, and this chamber communicates with the vent holes. When the air pressure inside the steel shell reaches a first predetermined pressure, i.e., when the pressure relief flipping part is subjected to the first predetermined pressure, the pressure relief flipping part automatically deforms towards the aluminum top cover, causing the conductive connecting plate to separate from the pressure relief flipping part at the spot welding hole. Additionally, an insulating gasket is provided between the conductive connecting plate and the explosion-proof plate. Ensure that the conductive connection plate and the pressure relief flip-over part are de-energized; furthermore, when the air pressure inside the steel shell increases further, the pressure relief flip-over part automatically cracks at the explosion-proof safety groove, and the air pressure inside the steel shell can be released through the pressure relief chamber and the vent, playing a role in safety and explosion prevention; since the top of the top cover assembly is an aluminum top cover, during group welding, the aluminum top cover of one of the steel shell cylindrical batteries of two adjacent steel shell cylindrical batteries can be welded to the steel shell of the other steel shell cylindrical battery, achieving reliable welding and fixing, and solving the problem of low tensile strength at the weld joint of the group.

[0039] To better understand the technical solution and beneficial effects of this application, the following detailed description is provided in conjunction with specific embodiments:

[0040] like Figure 1 and Figure 2As shown, a top cover assembly 10 of one embodiment is used for assembly and connection to a steel shell. In one embodiment, the top cover assembly 10 includes an aluminum top cover 100, an explosion-proof sheet 200, a conductive connecting plate 300, and an insulating gasket 400. The explosion-proof sheet 200 is disposed on one side of the aluminum top cover 100, and the explosion-proof sheet 200 covers the outer periphery of the aluminum top cover 100; the aluminum top cover 100 has a vent 102; a pressure relief cavity 202 is formed between the explosion-proof sheet 200 and the aluminum top cover 100, the pressure relief cavity 202 communicates with the vent 102, the explosion-proof sheet 200 has a pressure relief flipping part 210, and an explosion-proof safety groove 204 is formed on the side of the pressure relief flipping part 210 opposite to the pressure relief cavity 202. The pressure relief flipping part 210 is used to deform in the direction of approaching the aluminum top cover 100 when subjected to a first predetermined pressure, and the explosion-proof safety groove 204 is used to crack when the pressure relief flipping part 210 deforms.

[0041] In one embodiment, the conductive connecting plate 300 has spot weld holes 302, and the conductive connecting plate 300 is welded to the pressure relief flip-over portion 210 through the spot weld holes 302, so that the conductive connecting plate 300 is electrically connected to the pressure relief flip-over portion 210 when the pressure is less than the first predetermined pressure. When the pressure relief flip-over portion 210 is subjected to the first predetermined pressure, the pressure relief flip-over portion 210 deforms in the direction closer to the aluminum top cover 100, so that the pressure relief flip-over portion 210 and the conductive connecting plate 300 separate at the weld. An insulating gasket 400 is disposed between the conductive connecting plate 300 and the explosion-proof sheet 200, so that there is a gap between the conductive connecting plate 300 and the explosion-proof sheet 200, so that the conductive connecting plate 300 is electrically connected to the pressure relief flip-over portion 210 only through the welded portion at the spot weld hole 302 during normal use. When the pressure inside the steel shell is greater than or equal to the first predetermined pressure, the pressure relief flip-over part 210 deforms, causing the conductive connecting plate 300 to separate from the pressure relief flip-over part 210 at the spot weld hole 302. At this time, the conductive connecting plate 300 and the pressure relief flip-over part 210 are mutually insulated, providing a safety protection function. Furthermore, if the pressure inside the steel shell increases further, the pressure relief flip-over part 210 continues to deform until the explosion-proof safety groove 204 completely cracks, allowing the air pressure in the steel shell to be released through the pressure relief chamber 202 and the vent 102, achieving a better explosion-proof effect.

[0042] The aforementioned top cover assembly 10, since the aluminum top cover 100 has a vent 102, and the explosion-proof plate 200 is located on one side of the aluminum top cover 100 and covers the outer periphery of the aluminum top cover 100, a pressure relief chamber 202 is formed between the explosion-proof plate 200 and the aluminum top cover 100, and the pressure relief chamber 202 is connected to the vent 102. When the air pressure inside the steel shell reaches the first predetermined pressure, that is, when the pressure relief flipping part 210 is subjected to the first predetermined pressure, the pressure relief flipping part 210 automatically deforms towards the aluminum top cover 100, causing the conductive connecting plate 300 to separate from the pressure relief flipping part 210 at the spot welding hole 302. In addition, the conductive connecting plate 300 and the explosion-proof plate 200 are combined. An insulating washer 400 is provided between 00 to ensure that the conductive connecting plate 300 and the pressure relief flipping part 210 are de-energized; furthermore, when the air pressure inside the steel shell increases further, the pressure relief flipping part 210 automatically cracks at the explosion-proof safety groove 204, and the air pressure inside the steel shell can be released through the pressure relief chamber 202 and the vent 102, which plays a role in safety and explosion prevention; since the top of the top cover assembly 10 is an aluminum top cover 100, during group welding, the aluminum top cover 100 of one of the steel shell cylindrical batteries of two adjacent steel shell cylindrical batteries can be welded to the steel shell of the other steel shell cylindrical battery to achieve reliable welding and fixation, which solves the problem of low tensile strength at the weld joint of the group.

[0043] In one embodiment, the aluminum top cover 100 is an aluminum nail cover, that is, the aluminum top cover 100 is a pure aluminum cover, which makes the aluminum top cover 100 and the steel shell have better welding performance, greatly improves the welding yield, lowers welding energy, reduces costs and energy consumption, and the aluminum material has better welding tensile strength, which is conducive to the group welding and assembly of two adjacent steel shell cylindrical batteries.

[0044] It is understood that in other embodiments, the aluminum top cover 100 is not limited to an aluminum stud cover. For example, the aluminum top cover 100 may be a top cover made of composite materials. Figure 1 and Figure 2 As shown, in one embodiment, the aluminum top cover 100 includes a steel top cover plate 110 and an aluminum top cover plate 120. The vent 102 is formed on the steel top cover plate 110, and the aluminum top cover plate 120 is connected to the steel top cover plate 110. The aluminum top cover plate 120 is at least partially located on the side of the steel top cover plate 110 facing away from the conductive connecting plate 300. This facilitates welding of the aluminum top cover 100 to the steel shell of adjacent steel-cased cylindrical batteries, greatly improving welding yield, reducing welding energy, lowering costs, reducing energy consumption, and improving the tensile strength of aluminum welding. This also facilitates the group welding and assembly of two adjacent steel-cased cylindrical batteries. In this embodiment, the explosion-proof sheet 200 covers the outer periphery of the steel top cover plate 110, so that the explosion-proof sheet 200 is connected to the aluminum top cover 100.

[0045] like Figure 1 and Figure 2 As shown, in one embodiment, the aluminum top cover 120 and the steel top cover 110 are stacked, allowing the aluminum top cover 100 to be better welded to the steel casing of other cylindrical steel-cased batteries, while also giving the aluminum top cover 100 better strength. Furthermore, the thickness of the aluminum top cover 120 is greater than or equal to the thickness of the steel top cover 110, enabling the steel top cover 110 to better support the aluminum top cover 120, while also reducing the overall weight of the aluminum top cover 100 and giving it better weldability. In this embodiment, the thickness of the steel top cover 110 is 0.5 mm, and the thickness of the aluminum top cover 120 is 0.5 mm to 1 mm.

[0046] like Figure 1 and Figure 2 As shown, in one embodiment, the aluminum top cover 120 extends from the top surface of the steel top cover 110 to the edge of the steel top cover 110. The aluminum top cover 120 has a clearance hole 122, which communicates with the vent hole 102. The explosion-proof sheet 200 also covers the outer periphery of the aluminum top cover 120, so that the aluminum top cover 120 and the steel top cover 110 are stacked, and the explosion-proof sheet 200 simultaneously covers and fixes the aluminum top cover 120 and the steel top cover 110. It can be understood that in other embodiments, the aluminum top cover 120 on the top surface of the steel top cover 110 is not limited to extending to the edge of the steel top cover 110. For example, the aluminum top cover 120 is on the top surface of the steel top cover 110 and welded to the steel top cover 110, so that the aluminum top cover 120 is reliably fixed to the steel top cover 110. In this embodiment, the aluminum top cover 120 covers the protruding part of the top surface of the steel top cover 110, so that the aluminum top cover 100 of one of the two adjacent steel-cased cylindrical batteries can be well welded to the steel casing of the other steel-cased cylindrical battery.

[0047] like Figures 2 to 4 As shown, in one embodiment, there are multiple clearance holes 122 and multiple vent holes 102. Each clearance hole 122 corresponds to and is connected to one of the vent holes 102, allowing for rapid pressure relief after abnormal air pressure inside the steel casing causes the explosion-proof safety groove 204 to crack and fail, thus improving the safety of the steel-cased cylindrical battery. See also... Figure 5 Furthermore, the aluminum top cover plate 120 has a connecting aluminum strip 124 formed at each of the aforementioned clearance holes 122. The connecting aluminum strip 124 passes through the vent hole 102, and the ends of the connecting aluminum strips 124 corresponding to the multiple clearance holes 122 are welded together, so that the aluminum top cover plate 120 is reliably fixedly connected to the steel top cover plate 110, and at the same time, two adjacent connecting aluminum strips 124 are welded and fixedly connected to each other.

[0048] It is understood that in other embodiments, the aluminum top cover 120 and the steel top cover 110 are not limited to being stacked. For example... Figures 6 to 8 As shown, in another embodiment, the aluminum top cover 120 includes an aluminum top cover body 123 and a fixing part 125. The aluminum top cover body 123 is disposed on the side of the steel top cover 110 opposite to the conductive connecting plate 300. The fixing part 125 passes through the vent 102 and is connected to the steel top cover 110, so that the aluminum top cover 120 is connected and fixed to the inner surface of the steel top cover 110. In this embodiment, the aluminum top cover body 123 and the fixing part 125 are integrally formed. In other embodiments, the aluminum top cover body 123 and the fixing part 125 can also be formed separately and fixedly connected by welding.

[0049] like Figures 6 to 8 As shown, in one embodiment, there are multiple vent holes 102 and multiple fixing parts 125. The multiple fixing parts 125 are respectively inserted through the multiple vent holes 102 so that the pressure can be quickly released after the explosion-proof safety groove 204 cracks and fails due to abnormal air pressure inside the steel shell, thereby improving the safety of the steel shell cylindrical battery.

[0050] like Figures 6 to 8 As shown, in one embodiment, a plurality of the fixing parts 125 are welded together, so that the plurality of fixing parts 125 are fixedly connected to the steel top cover plate 110.

[0051] It is understood that in other embodiments, the plurality of fixing parts 125 are not limited to being welded together to fix the aluminum top cover 120 to the steel top cover 110. For example, as Figure 4 , Figure 9 , Figure 10 As shown, in one embodiment, each of the fixing portions 125 forms a first bent-weld portion 1252 and a second bent-weld portion 1254. Each of the aluminum top cover body 123 covers the convex top of the steel top cover 110. The first bent-weld portion passes through and is bent and fixed to one of the vent holes 102, and the second bent-weld portion passes through and is bent and fixed to the other vent hole 102, so that each fixing portion 125 is reliably fixed to the steel top cover 110. Further, both the first bent-weld portion and the second bent-weld portion are welded to the steel top cover 110, so that the aluminum top cover 120 is reliably fixed to the steel top cover 110.

[0052] See you again Figure 1Furthermore, the top cover assembly 10 also includes an insulating ring 500, which covers and connects to the periphery of the conductive connecting plate 300 and the periphery of the explosion-proof sheet 200, respectively, so that the top cover assembly 10 is reliably insulated from the steel shell. In this embodiment, the insulating ring 500 includes a positioning part 510 and a covering part 520. The positioning part 510 has a positioning groove 512, the conductive connecting plate 300 is located in the positioning groove 512 and connected to the positioning part 510, and the covering part 520 has a covering groove 522 communicating with the positioning groove 512. The periphery of the explosion-proof sheet 200 is located in the covering groove 522 and connected to the covering part 520, so that the insulating ring 500 covers and connects to the periphery of the conductive connecting plate 300 and the periphery of the explosion-proof sheet 200, respectively. Specifically, the diameter of the covering groove 522 is larger than the diameter of the positioning groove 512, so as to fix and position the explosion-proof sheet 200.

[0053] like Figure 1 and Figure 2 As shown, further, a stop flange 522a is formed on the peripheral wall of the covering groove 522. The stop flange 522a abuts against the top surface of the explosion-proof sheet 200, so that the explosion-proof sheet 200 is reliably confined within the covering groove 522, thereby reliably covering the periphery of the explosion-proof sheet 200 and the conductive connecting plate 300. In this embodiment, the periphery of the explosion-proof sheet 200 covers the periphery of the top cover 100, and the explosion-proof sheet 200 is welded to the top cover 100, so that the explosion-proof sheet 200 is reliably covered and connected to the top cover 100. Specifically, a covering periphery 203 is formed on the periphery of the explosion-proof sheet 200, and the covering periphery 203 covers the top cover 100. Furthermore, the stop flange 522a has multiple locking protrusions, all of which abut against the covering periphery 203, so that the stop flange 522a is better pressed against the covering periphery 203, thereby causing the stop flange 522a to abut against the top surface of the explosion-proof sheet 200.

[0054] This application also provides a steel-cased cylindrical battery, including the top cover assembly 10 described in any of the above embodiments. For example... Figure 1 and Figure 2As shown, the top cover assembly 10 further includes an aluminum top cover 100, an explosion-proof sheet 200, a conductive connecting plate 300, and an insulating gasket 400. The explosion-proof sheet 200 is disposed on one side of the aluminum top cover 100 and covers the outer periphery of the aluminum top cover 100; the aluminum top cover 100 has a vent 102; a pressure relief chamber 202 is formed between the explosion-proof sheet 200 and the aluminum top cover 100, the pressure relief chamber 202 is connected to the vent 102, the explosion-proof sheet 200 has a pressure relief flipping part 210, and an explosion-proof safety groove 204 is provided on the side of the pressure relief flipping part 210 opposite to the pressure relief chamber 202. The pressure relief flipping part 210 is used to deform towards the aluminum top cover 100 when subjected to a first predetermined pressure, and the explosion-proof safety groove 204 is used to crack when the pressure relief flipping part 210 deforms.

[0055] like Figure 1 and Figure 2 As shown, in one embodiment, the conductive connecting plate 300 has spot weld holes 302. The conductive connecting plate 300 is welded to the pressure relief flip-over portion 210 through the spot weld holes 302, so that the conductive connecting plate 300 is electrically connected to the pressure relief flip-over portion 210 when the pressure is less than the first predetermined pressure. When the pressure relief flip-over portion 210 is subjected to the first predetermined pressure, the pressure relief flip-over portion 210 deforms towards the aluminum top cover 100, causing the pressure relief flip-over portion 210 to separate from the conductive connecting plate 300 at the weld point. An insulating gasket 400 is disposed between the conductive connecting plate 300 and the explosion-proof sheet 200, so that there is a gap between the conductive connecting plate 300 and the explosion-proof sheet 200, thereby ensuring that the conductive connecting plate 300 is electrically connected to the pressure relief flip-over portion 210 only through the welded portion at the spot weld holes 302 during normal use. When the pressure inside the steel shell is greater than or equal to the first predetermined pressure, the pressure relief flip-over part 210 deforms, causing the conductive connecting plate 300 to separate from the pressure relief flip-over part 210 at the spot weld hole 302. At this time, the conductive connecting plate 300 and the pressure relief flip-over part 210 are mutually insulated, providing a safety protection function. Furthermore, if the pressure inside the steel shell increases further, the pressure relief flip-over part 210 continues to deform until the explosion-proof safety groove 204 completely cracks, allowing the air pressure in the steel shell to be released through the pressure relief chamber 202 and the vent 102, achieving a better explosion-proof effect.

[0056] The aforementioned cylindrical steel-cased battery has an aluminum top cover 100 with a vent 102. An explosion-proof plate 200 is located on one side of the aluminum top cover 100 and covers its outer periphery. A pressure relief chamber 202 is formed between the explosion-proof plate 200 and the aluminum top cover 100, and the pressure relief chamber 202 communicates with the vent 102. When the air pressure inside the steel casing reaches a first predetermined pressure, i.e., when the pressure relief flipping part 210 is subjected to the first predetermined pressure, the pressure relief flipping part 210 automatically deforms towards the aluminum top cover 100, causing the conductive connecting plate 300 to separate from the pressure relief flipping part 210 at the spot weld hole 302. This, combined with the connection between the conductive connecting plate 300 and the explosion-proof plate 200, ensures the battery's performance. An insulating washer 400 is provided between 00 to ensure that the conductive connecting plate 300 and the pressure relief flipping part 210 are de-energized; furthermore, when the air pressure inside the steel shell increases further, the pressure relief flipping part 210 automatically cracks at the explosion-proof safety groove 204, and the air pressure inside the steel shell can be released through the pressure relief chamber 202 and the vent 102, which plays a role in safety and explosion prevention; since the top of the top cover assembly 10 is an aluminum top cover 100, during group welding, the aluminum top cover 100 of one of the steel shell cylindrical batteries of two adjacent steel shell cylindrical batteries can be welded to the steel shell of the other steel shell cylindrical battery to achieve reliable welding and fixation, which solves the problem of low tensile strength at the weld joint of the group.

[0057] In one embodiment, the cylindrical steel-cased battery further includes a steel casing with an opening slot. The top cover assembly 10 is disposed within the opening slot and tightly connected to the steel casing, thereby sealing the top cover assembly 10 within the opening slot of the steel casing. In another embodiment, the top cover assembly 10 further includes an insulating ring 500, which covers and is connected to the periphery of the conductive connecting plate 300 and the periphery of the explosion-proof sheet 200. The insulating ring 500 is located within the opening slot and connected to the steel casing, ensuring a reliable insulating connection between the top cover assembly 10 and the steel casing.

[0058] To better demonstrate that the steel-cased cylindrical battery with the above-described top cover assembly 10 has good tensile strength, some embodiments are given below. However, it should be noted that the following embodiments do not exhaust all possible situations, and the materials used in the following embodiments are commercially available unless otherwise specified.

[0059] The following three sets of embodiments were tested, with a battery capacity of 14Ah and 2000 batteries in each set. The first set used the top cover assembly 10; the second set used the top cover assembly 10 of this application; and the third set used the top cover assembly 10 of this application, but without silver plating. All three sets were welded.

[0060] The specific experimental results are as follows:

[0061] Results of the first group of experiments: The average internal resistance of the battery was 3.0 mΩ, and the average tensile force of the welding test was 30 N.

[0062] The results of the second set of experiments showed that the average internal resistance of the battery was 3.1 mΩ, and the average tensile strength of the welding was 58 N.

[0063] The results of the third group of experiments: the average internal resistance of the battery was 2.8mΩ, and the average tensile force of the welding test was 59N.

[0064] The experimental results show that regardless of whether the top cover assembly 10 is silver-plated, as long as the top cover assembly 10 of this application is used, the average tensile strength of the weld is high, that is, the tensile strength of the weld joint of the steel-cased cylindrical battery using the top cover assembly 10 of this application is high.

[0065] Compared with the prior art, the present invention has at least the following advantages:

[0066] 1. The aforementioned top cover assembly 10 is used for assembly and connection to the steel shell. Since the aluminum top cover 100 has a vent 102, an explosion-proof plate 200 is disposed on one side of the aluminum top cover 100 and covers the outer periphery of the aluminum top cover 100. A pressure relief chamber 202 is formed between the explosion-proof plate 200 and the aluminum top cover 100. The pressure relief chamber 202 communicates with the vent 102. When the air pressure inside the steel shell reaches a first predetermined pressure, that is, when the pressure relief flipping part 210 is subjected to the first predetermined pressure, the pressure relief flipping part 210 automatically... The conductive connecting plate 300 deforms towards the aluminum top cover 100, causing it to separate from the pressure relief flip-over part 210 at the spot welding hole 302. In addition, an insulating gasket 400 is provided between the conductive connecting plate 300 and the explosion-proof sheet 200 to ensure that the conductive connecting plate 300 and the pressure relief flip-over part 210 are de-energized. Furthermore, when the air pressure inside the steel shell increases further, the pressure relief flip-over part 210 automatically cracks at the explosion-proof safety groove 204, and the air pressure inside the steel shell can be released through the pressure relief chamber 202 and the vent 102, thus achieving the function of safety and explosion protection.

[0067] 2. Since the top of the top cover assembly 10 is an aluminum top cover 100, during group welding, the aluminum top cover 100 of one of the steel-cased cylindrical batteries can be welded to the steel casing of the other steel-cased cylindrical battery to achieve reliable welding and fixation, thus solving the problem of low tensile strength at the weld joint of the group.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A top cover assembly, characterized in that, include: The aluminum top cover has ventilation holes. An explosion-proof sheet is disposed on one side of the aluminum top cover, and the explosion-proof sheet covers the outer periphery of the aluminum top cover; a pressure relief cavity is formed between the explosion-proof sheet and the aluminum top cover, the pressure relief cavity is connected to the vent hole, the explosion-proof sheet has a pressure relief flip-over part, and an explosion-proof safety groove is provided on the side of the pressure relief flip-over part opposite to the pressure relief cavity; the pressure relief flip-over part is used to deform towards the aluminum top cover when subjected to a first predetermined pressure, and the explosion-proof safety groove is used to crack when the pressure relief flip-over part deforms; A conductive connecting plate is formed with spot welding holes. The conductive connecting plate is welded to the pressure relief flip-off part through the spot welding holes, so that the conductive connecting plate is used to electrically connect with the pressure relief flip-off part when the pressure is less than the first predetermined pressure. An insulating washer is disposed between the conductive connecting plate and the explosion-proof sheet to create a gap between the conductive connecting plate and the explosion-proof sheet; The aluminum top cover includes a steel top cover sheet and an aluminum top cover sheet. The vent is formed on the steel top cover sheet. The aluminum top cover sheet is connected to the steel top cover sheet. The aluminum top cover sheet is at least partially located on the side of the steel top cover sheet opposite to the conductive connecting plate. The explosion-proof sheet covers the outer periphery of the steel top cover sheet. The aluminum top cover sheet and the steel top cover sheet are stacked together; The aluminum top cover sheet includes an aluminum top cover sheet body and a fixing part. The aluminum top cover sheet body is located on the side of the steel top cover sheet opposite to the conductive connecting plate. The fixing part passes through the air outlet and is connected to the steel top cover sheet.

2. The top cover assembly according to claim 1, characterized in that, The aluminum top cover extends from the top surface of the steel top cover to the edge of the steel top cover. The aluminum top cover has a clearance hole, which is connected to the vent hole. The explosion-proof sheet also covers the outer periphery of the aluminum top cover.

3. The top cover assembly according to claim 2, characterized in that, The number of the clearance holes and the number of the vent holes are both multiple, and the multiple clearance holes and the multiple vent holes are connected in a one-to-one correspondence.

4. The top cover assembly according to claim 1, characterized in that, The number of air outlets is multiple, and the number of fixing parts is multiple, with each fixing part corresponding to one of the multiple air outlets.

5. The top cover assembly according to claim 4, characterized in that, Multiple fixing parts are welded together; or, Each of the fixing parts forms a first bent welded part and a second bent welded part. Each of the aluminum top cover plates covers the convex top of the steel top cover plate. The first bent welded part passes through and is bent and fixed to one of the air outlets, and the second bent welded part passes through and is bent and fixed to the other air outlet.

6. A cylindrical battery with a steel casing, characterized in that, Includes the top cover assembly according to any one of claims 1 to 5.

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