Repairable explosion-proof cylindrical battery cover and cylindrical battery

Abstract

The present invention provides a repairable explosion-proof cylindrical battery cover and a cylindrical battery, which belong to the field of new energy battery technology. The cylindrical battery cover includes an end plate body and an explosion-proof assembly. The end plate body has an exhaust hole in the middle. The explosion-proof assembly includes a sealing float and an elastic member. The sealing float is slidably arranged in the exhaust hole. One end of the elastic member is connected to the end plate body, and the other end is connected to the sealing float. A through exhaust channel is provided in the sealing float. When the elastic member is in a normal state, one end of the exhaust channel is closed. When the elastic member is in a stretched state, the sealing float extends out of the exhaust hole, and the exhaust channel is used to connect the inside and outside of the cylindrical battery. The use of this cylindrical battery cover can achieve sustainable use of the explosion-proof structure while ensuring explosion-proof protection capabilities, reduce use and maintenance costs, and improve continuous working performance.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a repairable explosion-proof cylindrical battery cover and a cylindrical battery. Background Art

[0002] In the new energy battery sector, the practical application of lithium-ion power batteries in new energy vehicles depends not only on increasing battery energy density and cycle life and reducing costs, but also on further improving battery safety. Due to the inherent safety flaws of lithium-ion batteries, their use in new energy vehicles such as pure electric and hybrid vehicles always carries certain risks.

[0003] When lithium-ion battery cells are undergoing high-rate discharge and rapid charging, the interior of the cell shell rapidly heats up. The gas previously present inside the shell expands due to the heat, and the organic solvent vaporizes, further increasing the pressure inside the shell. This high pressure inside the shell poses a significant safety risk to the battery cells. To ensure the safe use of lithium-ion batteries, conventional methods typically involve punching holes in the cell cover and welding explosion-proof aluminum-plastic film over the cover's explosion-proof holes to form a cell explosion-proof valve. When the internal pressure of the cell becomes excessive, the pressure inside the cell breaks through the explosion-proof valve, providing a pressure relief valve that protects the cell and the overall safety of the lithium-ion battery.

[0004] While the prior art uses explosion-proof valves for safety protection, while they can provide immediate pressure relief to prevent safety issues, manufacturing requires multiple drilling and welding steps in the cell cover, resulting in a complex manufacturing process. Furthermore, after the valve provides pressure relief once, the explosion-proof aluminum-plastic film structure above it becomes scrapped, requiring the cell to be repaired. This results in high processing and operational costs, and poor ongoing performance. Summary of the Invention

[0005] The embodiment of the present invention provides a repairable explosion-proof cylindrical battery cover and cylindrical battery, which can achieve sustainable use of the explosion-proof structure while ensuring explosion-proof protection capabilities, reduce use and maintenance costs, and improve continuous working performance. The technical solution is as follows:

[0006] In a first aspect, an embodiment of the present invention provides a repairable explosion-proof cylindrical battery cell cover plate, comprising: an end plate body, a vent hole being provided in the middle thereof;

[0007] An explosion-proof assembly, comprising a sealing float and an elastic member, wherein the sealing float is slidably disposed in the exhaust hole, one end of the elastic member is connected to the end plate body, and the other end is connected to the sealing float;

[0008] Wherein, a through exhaust passage is provided in the sealing float column;

[0009] When the elastic member is in a normal state, one end of the exhaust passage is closed;

[0010] The elastic member is in a stretched state, the sealing float extends out of the exhaust hole, and the exhaust channel is used to connect the interior and exterior of the cylindrical battery core.

[0011] Optionally, a plurality of levels of air outlet holes are provided on the side wall of the sealing float, each level of the air outlet holes includes at least one air outlet hole, and the plurality of levels of the air outlet holes are evenly spaced along the axial direction of the sealing float.

[0012] Optionally, two end openings of the exhaust channel are provided on a side wall of the sealing float and one end of the sealing float in the length direction.

[0013] Optionally, the exhaust channel includes an air inlet hole arranged at one end of the sealing float, and a plurality of air outlet holes arranged on the side wall of the sealing float, each level of the air outlet holes includes at least one air outlet hole, the air inlet hole is connected to the air outlet holes, and the plurality of air outlet holes are evenly spaced along the axial direction of the sealing float.

[0014] Optionally, a pole is provided on the end plate body, the pole includes an exposed end and a flow-through end opposite to each other, and the exhaust hole is provided in the middle of the pole and passes through the exposed end and the flow-through end.

[0015] Optionally, the exhaust hole includes a first hole segment and a second hole segment, one end of the first hole segment is connected to the exposed end, the other end of the first hole segment is connected to one end of the second hole segment, and the other end of the second hole segment is connected to the flow end, the diameter of the first hole segment is smaller than the diameter of the second hole segment, and the sealing float is installed in the first hole segment.

[0016] Optionally, the exhaust hole includes a first hole segment and a second hole segment, one end of the first hole segment is connected to the exposed end, the other end of the first hole segment is connected to one end of the second hole segment, and the other end of the second hole segment is connected to the flow end, the diameter of the first hole segment is smaller than the diameter of the second hole segment, and the sealing float is installed in the first hole segment.

[0017] Optionally, the pole includes a first pole segment and a second pole segment, the first pole segment and the second pole segment are coaxially arranged, a compression spring is provided between the first pole segment and the second pole segment, the compression spring is parallel to the axial direction of the pole, and the first pole segment and the second pole segment are connected by the compression spring.

[0018] Optionally, the elastic member is a fixed spring, and one end of the elastic member is provided with a plurality of connecting legs, and one end of the elastic member is fixedly connected to the inner wall of the flow-through end through the plurality of connecting legs.

[0019] In the second aspect, an embodiment of the present invention also provides a cylindrical battery cell, including a repairable explosion-proof cylindrical battery cell cover as described in the first aspect above, wherein a pole is penetrated through the end plate body, and the pole includes opposite exposed ends and a flow-through end, and the exhaust hole is arranged in the middle of the pole and passes through the exposed end and the flow-through end, and the cylindrical battery cell also includes: a cylindrical shell and a core pack, the core pack is installed in the cylindrical shell, the end plate body fixed cover is arranged on the cylindrical shell, and the end of the core pack close to the end plate body is a full-pole lug flow-through surface, and the full-pole lug flow-through surface is in contact with the end face of the flow-through end.

[0020] Optionally, the full-tab flow surface is in a concave arc shape, and the flow end is in a conical boss shape that matches the full-tab flow surface.

[0021] Optionally, the cylindrical battery cell further includes an insulating core needle, which is passed through the middle of the core package of the core roll, and the insulating core needle is passed through the middle of the core package of the core roll, and a second exhaust channel connecting the middle of the core package of the core roll and the exhaust hole is provided in the insulating core needle.

[0022] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0023] When a cylindrical battery cell is operating at high rates of discharge and rapid charging, the internal gas expands due to the heat of the core pack, causing the pressure inside the cylindrical shell to exceed the specified value. The gas then enters the vent hole through the opening at the flow-through end, and then acts on the end of the sealing float closest to the flow-through end. Under the action of the internal gas pressure, the sealing float is pushed out of the vent hole at the exposed end. At this point, the vent hole on the side wall of the sealing float is connected to the outside world, allowing the high-pressure gas inside to enter the sealing float through the inlet hole and be discharged to the outside of the cylindrical cell through the vent hole, achieving explosion-proof pressure relief. After the high-pressure gas is largely discharged, the pressure inside the cylindrical cell drops below the safety set point, reducing the pressure acting on the sealing float. The elastic member, which is in the pulled-up state, recovers under its own elastic force, pulling the sealing float back into the vent hole, achieving reset and rapid sealing.

[0024] The explosion-proof component can work repeatedly. After completing the explosion-proof pressure relief, the cylindrical battery cell can continue to work normally without the need for frequent repair and replacement. It can achieve sustainable use of the explosion-proof structure while ensuring the explosion-proof protection capability, reduce use and maintenance costs, and improve continuous working performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 Schematic diagram of the three-dimensional structure of a repairable explosion-proof cylindrical battery cover provided by an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of the cross-sectional structure of a repairable explosion-proof cylindrical battery cover provided by an embodiment of the present invention;

[0028] Figure 3 is a top view of the structure of a sealing floating column provided by an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the three-dimensional structure of a cylindrical battery cell provided by an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the internal structure of a cylindrical battery cell provided by an embodiment of the present invention;

[0031] Figure 6 It is a structural cross-sectional view of the winding core package and the insulating core needle provided in an embodiment of the present invention.

[0032] In the picture:

[0033] 1-end plate body; 2-pole; 2a-exposed end; 2b-current-passing end; 3-explosion-proof assembly; 4-cylindrical shell; 4-core core package; 6-insulating core needle; 11-pole mounting hole; 21-exhaust hole; 22-first column section; 23-second column section; 24-compression spring; 31-sealing float; 32-elastic part; 61-center hole; 62-through hole; 211-first hole section; 212-second hole section; 311-air inlet; 312-air outlet; 321-connecting foot. DETAILED DESCRIPTION

[0034] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0035] When lithium-ion battery cells are undergoing high-rate discharge and rapid charging, the interior of the cell shell rapidly heats up. The gas previously present inside the shell expands due to the heat, and the organic solvent vaporizes, further increasing the pressure inside the shell. This high pressure inside the shell poses a significant safety risk to the battery cells. To ensure the safe use of lithium-ion batteries, conventional methods typically involve punching holes in the cell cover and welding explosion-proof aluminum-plastic film over the cover's explosion-proof holes to form a cell explosion-proof valve. When the internal pressure of the cell becomes excessive, the pressure inside the cell breaks through the explosion-proof valve, providing a pressure relief valve that protects the cell and the overall safety of the lithium-ion battery.

[0036] While the prior art uses explosion-proof valves for safety protection, while they can provide immediate pressure relief to prevent safety issues, manufacturing requires multiple drilling and welding steps in the cell cover, resulting in a complex manufacturing process. Furthermore, after the valve provides pressure relief once, the explosion-proof aluminum-plastic film structure above it becomes scrapped, requiring the cell to be repaired. This results in high processing and operational costs, and poor ongoing performance.

[0037] Figure 1 It is a schematic diagram of the three-dimensional structure of the repairable explosion-proof cylindrical battery cover provided by an embodiment of the present invention. Figure 2 It is a schematic cross-sectional structure diagram of a repairable explosion-proof cylindrical battery cover provided by an embodiment of the present invention. Figure 3 FIG is a top view of the structure of the sealing float provided by an embodiment of the present invention. Figures 1 to 3 As shown, through practice, the applicant provides a repairable explosion-proof cylindrical battery cover, including an end plate body 1, a pole 2 and an explosion-proof component 3.

[0038] The end plate body 1 is disc-shaped and is provided with a pole mounting hole 11 .

[0039] The pole 2 is inserted and fixed in the pole mounting hole 11. The pole 2 includes an exposed end 2a and a current-passing end 2b. The exposed end 2a and the current-passing end 2b are located on either side of the end plate body 1. A vent 21 is defined in the center of the pole 2. The vent 21 is arranged along the axial direction of the pole 2 and extends through the exposed end 2a and the current-passing end 2b.

[0040] The explosion-proof assembly 3 includes a sealing float 31 and an elastic member 32. The sealing float 31 is slidably mounted in the exhaust hole 21, with the side wall of the sealing float 31 abutting against the wall of the exhaust hole 21. The elastic member 32 is mounted in the exhaust hole 21, with one end of the elastic member 32 fixedly connected to the inner wall of the flow-through end 2b, and the other end of the elastic member 32 connected to the sealing float 31. An air inlet 311 is provided at the end of the sealing float 31 close to the flow-through end 2b, and an air outlet 312 is provided on the side wall of the sealing float 31. The air inlet 311 is connected to the air outlet 312, and the end of the sealing float 31 away from the flow-through end 2b is flush with the end surface of the exposed end 2a.

[0041] In an embodiment of the present invention, the repairable explosion-proof cylindrical battery cover is fixedly covered on the cylindrical shell of the cylindrical battery by the end plate body 1 during assembly to achieve sealing. After assembly is completed, the exposed end 2a of the pole 2 is exposed to the outside of the cylindrical shell 4 for connection with external electrical equipment, while the overcurrent end 2b is arranged inside the cylindrical shell 4 for overcurrent connection to the core pack 5 arranged inside the cylindrical shell 4. When the cylindrical battery is working for high-rate discharge and fast charging, when the core pack 5 heats up and the internal gas expands due to heat, causing the air pressure inside the cylindrical shell 4 to exceed the standard, the gas will enter the exhaust hole 21 from the opening at the overcurrent end 2b, and then act on the end of the sealing float 31 close to the overcurrent end 2b. Under normal operating conditions, the sealing float 31 is positioned within the vent 21 by the pull of the elastic member 32. The end of the current-passing end 2b is aligned with the end surface of the exposed end 2a, ensuring that the exposed end 2a of the terminal 2 remains flush. However, under the pressure of internal gas, the sealing float 31 is pushed out of the vent 21 opening at the exposed end 2a. At this point, the gas outlet 312 on the sidewall of the sealing float 31 is connected to the outside world. High-pressure gas can enter the sealing float 31 through the gas inlet 311 and be discharged to the outside of the cylindrical cell through the gas outlet 312, achieving explosion-proof pressure relief. After the high-pressure gas is largely discharged, the pressure within the cylindrical cell drops below a safe set point, reducing the pressure acting on the sealing float 31. The elastic member 32, now in its lifted position, recovers under its own force, pulling the sealing float 31 back into the vent 21, achieving reset and rapid sealing. The explosion-proof component 3 can work repeatedly. After completing the explosion-proof pressure relief, the cylindrical battery cell can continue to work normally without the need for frequent repair and replacement. While ensuring the explosion-proof protection capability, it can achieve sustainable use of the explosion-proof structure, reduce use and maintenance costs, and improve continuous working performance.

[0042] Optionally, the sidewall of the sealing float 31 is provided with multiple stages of gas outlet holes 312, each stage of gas outlet holes 312 including at least one gas outlet hole 312, and the multiple stages of gas outlet holes 312 are evenly spaced along the axis of the sealing float 31. For example, in an embodiment of the present invention, by providing multiple stages of gas outlet holes 312 at intervals along the axis of the sealing float 31, when the internal air pressure exceeds a predetermined value by a small amount, the sidewall area of the sealing float 31 extending from the exposed end 2a under the action of the air pressure is correspondingly small, and the number of gas outlet holes 312 communicating with the outside world is also correspondingly small, allowing gas to be discharged through a smaller number of gas outlet holes 312. However, when the internal air pressure exceeds the predetermined value by a large amount, the sidewall area of the sealing float 31 extending from the exposed end 2a and the number of gas outlet holes 312 communicating with the outside world increase, thereby increasing the number of channels for high-pressure gas to be discharged and the exhaust speed. The sum of the expansion and contraction of the sealing float 31 and the exhaust time remains constant, and the sealing float 31 can quickly retract after exhaust is complete, thereby ensuring the sealing performance of the cylindrical battery cell.

[0043] Optionally, each stage of the air outlet holes 312 includes multiple air outlet holes 312, which are arranged at equal angular intervals along the circumference of the sealing float 31. For example, in an embodiment of the present invention, each stage of the air outlet holes 312 includes twelve air outlet holes 312 spaced at equal angular intervals along the axis of the sealing float 31. The air inlet hole 311 extends along the axis of the sealing float 31 and is closed at one end. The side wall of the air inlet hole 311 communicates with each of the multiple stages of the air outlet holes 312. During exhaust, high-pressure gas can be evenly discharged from the multiple air outlet holes 312 of each stage along multiple radial directions of the sealing float 31, resulting in more uniform and smooth exhaust, effectively improving explosion-proof pressure relief capabilities.

[0044] Optionally, the vent 21 includes a first hole section 211 and a second hole section 212. One end of the first hole section 211 is connected to the exposed end 2a, the other end of the first hole section 211 is connected to one end of the second hole section 212, and the other end of the second hole section 212 is connected to the flow end 2b. The diameter of the first hole section 211 is smaller than the diameter of the second hole section 212, and the sealing float 31 is installed in the first hole section 211. For example, in an embodiment of the present invention, by providing the first and second hole sections 211, 212 with gradually increasing diameters, after the cylindrical cell cover is installed and electrolyte needs to be injected into the cylindrical cell, a liquid injection machine can be used to press down through the opening of the vent 21 at the exposed end 2a, pressing the sealing float 31 from the first hole section 211 into the second hole section 212. At this point, the liquid injection machine can be used to inject liquid into the interior of the cylindrical shell 4 through the annular space formed between the second hole section 212 and the sealing float 31. After liquid injection is complete, the sealing float 31 returns to the first hole section 211 under the elastic action of the compressed elastic member 32, achieving reseal. While providing explosion-proof venting, the vent hole 21 also serves as a liquid injection port for the cylindrical cell, enhancing the practicality of the repairable explosion-proof cylindrical cell cover.

[0045] Optionally, the pole 2 includes a first column section 22 and a second column section 23, which are coaxially arranged. A compression spring 24 is provided between the first column section 22 and the second column section 23, and the compression spring 24 is parallel to the axis of the pole 2. The first column section 22 and the second column section 23 are connected by the compression spring 24. For example, in an embodiment of the present invention, the pole 2 is divided into a first column section 22 connected to the end plate body 1 and a second column section 23 spaced apart and arranged inside the cylindrical shell 4. After the cover is completed, the second column section 23 can be tightly attached to the core package 5 located inside under the action of the compression spring 24, ensuring stable overcurrent connection, and also playing a role in limiting and fixing the core package 5 in the axial direction. At the same time, when injecting liquid, the electrolyte injected through the vent 21 can also be fully filled into the interior of the cylindrical shell 4 through the gap between the first column section 22 and the second column section 23, thereby improving the wettability of the electrolyte inside the cylindrical battery cell.

[0046] Optionally, a plurality of compression springs 24 are provided between the first column section 22 and the second column section 23, and the plurality of compression springs 24 are arranged at equal angular intervals along the circumference of the pole 2. For example, in an embodiment of the present invention, by providing four compression springs 24 at equal angular intervals along the circumference of the pole 2, uniform elastic force applied to various parts of the second column section 23 is ensured, ensuring that the flow-through end 2b can contact the core package 5 in a correct posture, ensuring uniform force and a securely positioned connection between the two, and preventing the core package 5 from shaking relative to the cylindrical shell 4 during operation, thereby affecting the flow-through capacity.

[0047] Optionally, one end of the elastic member 32 is provided with a plurality of connecting legs 321, and one end of the elastic member 32 is fixedly connected to the inner wall of the overflow end 2b via the plurality of connecting legs 321. For example, in an embodiment of the present invention, by distributing a plurality of connecting legs 321 at one end of the elastic member 32 for fixed welding to the inner wall of the overflow end 2b, the connection stability of the elastic member 32 within the pole 2 is improved, and a single connection point is prevented from loosening and breaking due to frequent stress during repeated expansion and contraction, thereby further improving the overall service life of the repairable explosion-proof cylindrical battery cover.

[0048] Figure 4 It is a schematic diagram of the three-dimensional structure of a cylindrical battery cell provided by an embodiment of the present invention. Figure 5 It is a schematic diagram of the internal structure of a cylindrical battery cell provided in an embodiment of the present invention. Figure 6 1 is a cross-sectional view of the structure of the core package and the insulating core needle provided by the embodiment of the present invention. Figures 4 to 6 The embodiment of the present invention further provides a cylindrical battery cell, including Figures 1 to 3The repairable explosion-proof cylindrical battery cover shown is characterized in that the cylindrical battery cell also includes a cylindrical shell 4 and a core package 5. The core package 5 is installed in the cylindrical shell 4, and the end plate body 1 is fixedly covered on the cylindrical shell 4. The end of the core package 5 near the end plate body 1 is a full-tab flow surface, and the full-tab flow surface is in contact with the end surface of the flow end 2b. For example, in an embodiment of the present invention, when the cylindrical battery cell is operating for high-rate discharge and rapid charging, when the core package 5 heats up and causes the internal gas to expand due to heat, causing the air pressure inside the cylindrical shell 4 to exceed the standard, the gas will enter the exhaust hole 21 through the opening at the flow end 2b, and then act on the end of the sealing float 31 near the flow end 2b. Under normal operating conditions, the sealing float 31 is positioned within the vent 21 by the pull of the elastic member 32. The end of the current-passing end 2b is aligned with the end surface of the exposed end 2a, ensuring that the exposed end 2a of the terminal 2 remains flush. However, under the pressure of internal gas, the sealing float 31 is pushed out of the vent 21 opening at the exposed end 2a. At this point, the gas outlet 312 on the sidewall of the sealing float 31 is connected to the outside world. High-pressure gas can enter the sealing float 31 through the gas inlet 311 and be discharged to the outside of the cylindrical cell through the gas outlet 312, achieving explosion-proof pressure relief. After the high-pressure gas is largely discharged, the pressure within the cylindrical cell drops below a safe set point, reducing the pressure acting on the sealing float 31. The elastic member 32, now in its lifted position, recovers under its own force, pulling the sealing float 31 back into the vent 21, achieving reset and rapid sealing. The explosion-proof component 3 can work repeatedly. After completing the explosion-proof pressure relief, the cylindrical battery cell can continue to work normally without the need for frequent repair and replacement. While ensuring the explosion-proof protection capability, it can achieve sustainable use of the explosion-proof structure, reduce use and maintenance costs, and improve continuous working performance.

[0049] At the same time, a core pack 5 with a full-pole-ear current surface at one end is used, which directly contacts the current end 2b of the pole 2 through the full-pole-ear current surface to achieve current conduction. There is no need to set up additional structures such as current discs for welding the pole ears and the pole 2, thereby reducing the processing steps of the entire cylindrical battery cell and reducing additional processing costs such as current disc mold opening.

[0050] Optionally, the full-tab flow surface is in a concave arc shape, and the flow end 2b is in a conical boss shape that matches the full-tab flow surface. For example, in an embodiment of the present invention, by setting the full-tab flow surface of the core package 5 to a concave arc shape, and setting the flow end 2b of the pole 2 to a conical boss shape, in a cross section along the axial direction of the cylindrical shell 4, the abutment surface between the flow end 2b and the core package 5 is an inclined surface. In the cylindrical shell 4 with a fixed unit diameter, compared with the flat abutment method arranged along the radial direction of the cylindrical shell 4, this structural setting improves the contact and flow area between the flow end 2b of the pole 2 and the core package 5, further improving the flow capacity of the cylindrical battery cell.

[0051] Optionally, the cylindrical battery cell further includes an insulating core needle 6, which is disposed in the middle of the core wrap 5. The insulating core needle 6 has a central hole 61 within it, and the sidewalls of the insulating core needle 6 have multiple through-holes 62 connected to the central hole 61. The central hole 61 is connected to the vent 21. For example, in an embodiment of the present invention, by disposing the insulating core needle 6 in the middle of the core wrap 5, the positive and negative pole pieces and the separator are wound on the core wrap 5. The insulating core needle 6 can play a shaping role and serve as a support in the middle of the core wrap 5 to prevent collapse after long-term use, thereby causing battery cell safety issues. Furthermore, because the sidewalls of the insulating core needle 6 have multiple through-holes 62 connected to the internal central hole 61, when gas is generated inside the core wrap 5, it can enter the insulating core needle 6 through the through-holes 62 and be guided through the central hole 61 to be discharged into the vent 21, achieving rapid discharge and avoiding accumulation inside the core wrap 5, further improving the explosion-proof and pressure relief capabilities.

[0052] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons of ordinary skill in the art to which the invention belongs. The terms "first", "second" and similar words used in the patent specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, terms such as "a" or "an" do not indicate a quantitative limitation, but rather indicate the presence of at least one. Terms such as "include" or "comprising" mean that the elements or objects appearing before "include" or "comprising" include the elements or objects listed after "include" or "comprising" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", and "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0053] The above descriptions are merely optional embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A repairable explosion-proof cylindrical battery cover, characterized in that: include: The end plate body (1) has an exhaust hole (21) in the middle; An explosion-proof assembly (3) includes a sealing float (31) and an elastic member (32), wherein the sealing float (31) is slidably arranged in the exhaust hole (21), a pole (2) is pierced through the end plate body (1), the pole (2) includes an exposed end (2a) and a flow-through end (2b) opposite to each other, the exhaust hole (21) is arranged in the middle of the pole (2) and passes through the exposed end (2a) and the flow-through end (2b), and one end of the elastic member (32) is fixedly connected to the inner wall of the flow-through end (2b), and the other end is connected to the sealing float (31); Wherein, a through exhaust passage is provided in the sealing float column (31); When the elastic member (32) is in a normal state, one end of the exhaust passage is closed; The elastic member (32) is in a stretched state, the sealing float (31) extends out of the exhaust hole (21), and the exhaust channel is used to connect the inside and outside of the cylindrical battery core; The vent hole (21) comprises a first hole section (211) and a second hole section (212), one end of the first hole section (211) is connected to the exposed end (2a), the other end of the first hole section (211) is connected to one end of the second hole section (212), and the other end of the second hole section (212) is connected to the flow end (2b), the diameter of the first hole section (211) is smaller than the diameter of the second hole section (212), the sealing float (31) is installed in the first hole section (211), and the vent hole (21) is configured such that when the sealing float (31) is pressed from the first hole section (211) into the second hole section (212), liquid can be injected from the annular space formed between the second hole section (212) and the sealing float (31) by a liquid injection machine, and after the liquid injection is completed, the sealing float (31) is reset to achieve resealing.

2. The repairable explosion-proof cylindrical battery cover according to claim 1, characterized in that: The two end openings of the exhaust channel are arranged on the side wall of the sealing float (31) and one end of the sealing float (31) in the length direction.

3. The repairable explosion-proof cylindrical battery cover according to claim 2, characterized in that: The exhaust channel comprises an air inlet (311) provided at one end of the sealing float (31), and a plurality of air outlet holes (312) provided on a side wall of the sealing float (31), each level of the air outlet holes (312) comprising at least one air outlet hole (312), the air inlet (311) being in communication with the air outlet holes (312), and the plurality of air outlet holes (312) being evenly spaced apart along the axial direction of the sealing float (31).

4. The repairable explosion-proof cylindrical battery cover according to claim 1, characterized in that: The pole (2) comprises a first pole segment (22) and a second pole segment (23); a compression spring (24) is provided between the first pole segment (22) and the second pole segment (23); the compression spring (24) is parallel to the axis direction of the pole (2); and the first pole segment (22) and the second pole segment (23) are connected via the compression spring (24).

5. The repairable explosion-proof cylindrical battery cover according to claim 1, characterized in that: The elastic member (32) is a fixed spring, and one end of the elastic member (32) is provided with a plurality of connecting legs (321). One end of the elastic member (32) is fixedly connected to the inner wall of the flow-through end (2b) via the plurality of connecting legs (321).

6. A cylindrical battery cell, comprising a repairable explosion-proof cylindrical battery cell cover according to any one of claims 1 to 5, wherein a pole (2) is provided on the end plate body (1), the pole (2) comprises an exposed end (2a) and a current-passing end (2b) opposite to each other, the exhaust hole (21) is provided in the middle of the pole (2) and passes through the exposed end (2a) and the current-passing end (2b), and is characterized in that: The cylindrical battery cell further comprises a cylindrical shell (4) and a core pack (5), wherein the core pack (5) is installed in the cylindrical shell (4), the end plate body (1) is fixedly covered on the cylindrical shell (4), and one end of the core pack (5) close to the end plate body (1) is a full-electrode tab flow surface, and the full-electrode tab flow surface is in contact with the end surface of the flow end (2b).

7. The cylindrical battery cell according to claim 6, characterized in that: The full-electrode tab flow surface is in a concave arc shape, and the flow end (2b) is in a conical boss shape that matches the full-electrode tab flow surface.

8. The repairable explosion-proof cylindrical battery cover according to claim 6, characterized in that: The cylindrical battery core further comprises an insulating core needle (6), the insulating core needle (6) being arranged through the middle of the core package (5), and a second exhaust channel communicating with the middle of the core package (5) and the exhaust hole (21) being arranged in the insulating core needle (6).

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