A cylindrical explosion-proof battery
By designing internal venting channels and vents in cylindrical explosion-proof batteries, the terminals rupture and release gas when pressure is abnormal, solving the problem of ineffective gas release in the compact internal space of consumer electronic devices and improving the safety and reliability of the batteries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGXI MIC-POWER NEW ENERGY CO LTD
- Filing Date
- 2025-03-11
- Publication Date
- 2026-07-31
AI Technical Summary
Existing laser-sealed consumer batteries pose a risk of explosion or fire under abnormal conditions due to the inability of internal gas to be effectively released, especially in the case of limited internal space in consumer electronic devices.
A cylindrical explosion-proof battery was designed to directly discharge gas through an internal venting channel and vent. This includes the rupture of the terminal when the pressure exceeds a threshold, with the gas being rapidly discharged through the venting channel between the terminal and the cap body via the venting port on the cap.
It effectively solves the problem of explosion-proof failure caused by space constraints, ensures that gas does not accumulate inside the battery, reduces the risk of explosion or fire, and is especially suitable for scenarios where the internal space of consumer electronic devices is compact.
Smart Images
Figure CN224582440U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery explosion-proof technology, and more specifically, to a cylindrical explosion-proof battery. Background Technology
[0002] Currently, most laser-sealed consumer batteries rely on the internal pressure rupturing the explosion-proof material at the designated explosion-proof location when the cell malfunctions. However, this design presents significant problems in practical applications: due to the limited internal space of consumer electronic devices, even if the explosion-proof material ruptures in an abnormal situation, the gas cannot be effectively released. This external space constraint causes gas to accumulate inside the battery, leading to a continuous increase in pressure, which may eventually cause the battery to explode or catch fire, seriously threatening user safety and device integrity. Utility Model Content
[0003] The purpose of this invention is to provide a cylindrical explosion-proof battery that directly discharges gas through an internal venting channel and vent, without relying on external space, effectively solving the problem of explosion-proof failure caused by the compact internal space of consumer electronic devices.
[0004] A cylindrical explosion-proof battery, comprising: The outer shell has an internal cavity and an opening at one axial end that communicates with the cavity; The battery cell is housed within the receiving cavity and has a positive electrode tab; A terminal post, electrically connected to the positive electrode tab, having a preset thickness and configured to rupture when the internal pressure of the battery exceeds a preset threshold; A battery cover includes a cover plate and a cap. The cover plate covers the opening and has a through hole extending through it along its axial direction. The cap includes a cap body and an extension portion. The extension portion extends radially outward from the periphery of the cap body and abuts against a local area of the terminal post. The cap body passes through the through hole and protrudes outward, forming an exhaust channel with the terminal post. The cap body has at least one exhaust port, which connects the exhaust channel to the external environment.
[0005] In the above technical solution, when the internal pressure of the battery abnormally rises and exceeds a preset threshold, the electrode post with a preset thickness will rupture rapidly, releasing the internal pressure. After rupture, the gas is quickly discharged to the external environment through the exhaust channel formed between the electrode post and the cap body, via the exhaust port on the cap, preventing gas from accumulating inside the battery. This design does not rely on external space and is particularly suitable for scenarios with compact internal space in consumer electronic devices, effectively solving the problem of explosion-proof failure caused by space limitations in traditional explosion-proof designs.
[0006] Furthermore, the thickness is 0.05mm to 0.25mm.
[0007] In the above technical solution, the pole with a thickness of 0.05mm to 0.25mm can break in time when the pressure is abnormal, while ensuring the structural strength under normal pressure.
[0008] Furthermore, the pole post is provided with a protrusion, which is opposite to the exhaust channel.
[0009] In the above technical solution, the protrusion is positioned opposite the exhaust channel to ensure accurate positioning of the electrode post during installation. This design avoids misalignment between the electrode post and the exhaust channel, ensuring smooth gas discharge.
[0010] Furthermore, the number of exhaust ports is three, and the three exhaust ports are evenly arranged along the circumference of the cap body.
[0011] In the above technical solution, the design of three evenly arranged exhaust ports optimizes the release process of internal battery pressure, ensuring that gas can flow out of the battery quickly and evenly.
[0012] Furthermore, it also includes an insulating seal, wherein a portion of the insulating seal abuts between the cover plate and the extension portion, and another portion abuts between the cover plate and the pole post.
[0013] In the above technical solution, the electrical insulation and sealing functions of the insulating sealant jointly improve battery safety. It prevents short circuits and protects the battery interior from external moisture and contaminants.
[0014] Furthermore, a first insulating adhesive paper is attached to one end of the battery cell near the positive electrode tab, and the first insulating adhesive paper is opposite to the positive electrode tab.
[0015] In the above technical solution, the main function of the first insulating tape is to provide electrical isolation. Inside the battery, the positive tab is the output terminal of the battery's positive electrode, which is directly connected to the positive electrode material of the battery cell. The presence of the insulating tape ensures electrical isolation between the positive tab and other components inside the battery that may pose a short-circuit risk (such as the negative electrode material of the battery cell, the casing, or the battery cover).
[0016] Furthermore, the end of the battery cell away from the opening is provided with a negative electrode tab, which is connected to the bottom of the outer casing.
[0017] In the above technical solution, the negative electrode tab is the lead-out end of the battery's negative electrode. It is usually directly connected to the negative electrode material of the battery cell, and then the negative electrode material of the battery cell is connected to the external circuit to ensure that the battery can discharge normally.
[0018] Furthermore, a second insulating tape is attached to one end of the battery cell near the negative electrode tab, and the second insulating tape is opposite to the negative electrode tab.
[0019] In the above technical solution, the main function of the second insulating tape is to provide electrical isolation and ensure a safe electrical distance between the negative electrode tab and other components inside the battery that may pose a short circuit risk.
[0020] Compared with existing technologies, the advantages of this invention are as follows: when the internal pressure of the battery abnormally rises and exceeds a preset threshold, the electrode post with a preset thickness will rupture rapidly, releasing the internal pressure; after rupture, the gas is quickly discharged to the external environment through the exhaust channel formed between the electrode post and the cap body, via the exhaust port on the cap, preventing gas from accumulating inside the battery. This design does not rely on external space and is particularly suitable for scenarios with compact internal space in consumer electronic devices, effectively solving the problem of explosion-proof failure caused by space limitations in traditional explosion-proof designs. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the cylindrical explosion-proof battery according to an embodiment of the present invention.
[0022] Figure 2 This is an exploded view of the cylindrical explosion-proof battery according to an embodiment of the present invention.
[0023] Figure 3 This is a schematic diagram of the outer shell of an embodiment of the present utility model.
[0024] Explanation of icon numbers 1. Outer shell; 101. Receiving cavity; 102. Opening; 2. Battery cell; 201. Positive tab; 202. Negative tab; 3. Pole post; 301. Protrusion; 4. Battery cover; 401. Cover plate; 4011. Through hole; 402. Cap; 4021. Cap body; 4021a. Vent; 4022. Extension section; 5. Exhaust channel; 6. Insulating seal; 7. First insulating tape; 8. Second insulating tape. Detailed Implementation
[0025] The cylindrical explosion-proof battery of this utility model will be described in further detail below with reference to specific embodiments and accompanying drawings. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.
[0026] Please refer to Figures 1 to 3 In a preferred embodiment, the cylindrical explosion-proof battery of this utility model includes: The outer shell 1 has a cavity 101 inside and an opening 102 communicating with the cavity 101 at one end in the axial direction; The battery cell 2 is housed within the receiving cavity 101 and has a positive electrode tab 201; The terminal 3 is electrically connected to the positive electrode tab 201. The terminal 3 has a preset thickness and is configured to rupture when the internal pressure of the battery exceeds a preset threshold. The battery cover 4 includes a cover plate 401 and a cap 402. The cover plate 401 covers the opening 102 and has a through hole 4011 extending through it along its axial direction. The cap 402 includes a cap body 4021 and an extension portion 4022. The extension portion 4022 extends radially outward from the periphery of the cap body 4021 and abuts against a local area of the terminal post 3. The cap body 4021 passes through the through hole 4011 and protrudes outward, forming an exhaust channel 5 between itself and the terminal post 3. The cap body 4021 has at least one exhaust port 4021a, which connects the exhaust channel 5 to the external environment.
[0027] In practical applications, when the internal pressure of the battery abnormally rises and exceeds a preset threshold, the electrode post 3 with a preset thickness will rupture rapidly, releasing the internal pressure. After rupture, the gas is quickly discharged to the external environment through the exhaust channel 5 formed between the electrode post 3 and the cap body 4021, and through the exhaust port 4021a on the cap body 4021, preventing gas from accumulating inside the battery. This design does not rely on external space and is particularly suitable for scenarios with compact internal space in consumer electronic devices, effectively solving the problem of explosion-proof failure caused by space limitations in traditional explosion-proof designs.
[0028] In some embodiments of this invention, the thickness of the electrode post 3 is 0.05mm to 0.25mm. An electrode post 3 with a thickness of 0.05mm to 0.25mm can rupture promptly under abnormal pressure while maintaining structural strength under normal pressure. In the design of cylindrical explosion-proof batteries, the thickness of the electrode post 3 is specifically set within the range of 0.05mm to 0.25mm. This thickness range is selected based on calculations and simulations of the battery's internal pressure response to ensure that when the internal pressure reaches a dangerous level, the electrode post 3 can rupture in a timely and effective manner, thereby releasing the internal pressure and preventing the battery from exploding. It should be noted that during use, the thickness of the electrode post 3 can be 0.12mm or 0.15mm. Using electrode posts 3 with this thickness ensures that the battery will not rupture unnecessarily under normal use conditions, thus maintaining the battery's integrity and reliability. Simultaneously, it ensures that when the internal pressure of the battery reaches a preset safety threshold, the electrode post 3 can reliably rupture, thereby achieving safe pressure release.
[0029] For further details, please refer to [link / reference]. Figure 1 and Figure 2The electrode post 3 has a protrusion 301, which is opposite to the exhaust channel 5. The protrusion 301 is positioned opposite to the exhaust channel 5 to ensure that the electrode post 3 can be accurately positioned during installation. This design avoids misalignment between the electrode post 3 and the exhaust channel 5, ensuring that gas can be discharged smoothly.
[0030] Specifically, in some embodiments of this invention, the number of vents 4021a is three, and the three vents 4021a are evenly arranged circumferentially along the cap body 4021. This evenly arranged design of the three vents 4021a optimizes the release process of internal battery pressure, ensuring that gas can flow out of the battery quickly and evenly. When the internal battery pressure abnormally increases, causing the terminal post 3 to rupture, the high-pressure gas will flow along the venting channel 5 to the vent 4021a. The evenly distributed design of the three vents 4021a ensures that gas can be evenly released from inside the battery to the external environment, avoiding potential damage to the battery structure due to excessive local pressure. The design of multiple vents 4021a increases the number of gas release channels, thereby improving venting efficiency. This means that after the terminal post 3 ruptures, high-pressure gas can flow out of the battery more quickly, helping to rapidly reduce internal pressure. The evenly distributed vents 4021a not only improve venting efficiency but also help maintain the integrity of the battery structure during gas release. This reduces the risk of the battery exploding due to excessive internal pressure, enhancing battery safety.
[0031] Please refer to this again. Figure 1 The battery also includes an insulating seal 6, which partially abuts between the cover plate 401 and the extension portion 4022, and another portion abuts between the cover plate 401 and the terminal post 3. The electrical insulation and sealing functions of the insulating seal 6 together improve battery safety. It prevents short circuits and protects the battery interior from external moisture and contaminants. Specifically, one of the main functions of the insulating seal 6 is to provide electrical insulation. Inside the battery, the positive electrode tab 201 is connected to the terminal post 3, forming the positive output of the battery. The presence of the insulating seal 6 ensures electrical isolation between the positive electrode and the battery cover, thereby preventing short circuits. In addition to electrical insulation, the insulating seal 6 also seals the battery interior. It tightly abuts between the cover plate 401, the extension portion 4022, and the terminal post 3, forming an effective barrier that prevents external moisture and contaminants from entering the battery interior. This is crucial for maintaining a dry and clean internal environment, contributing to extended battery life and performance.
[0032] Additionally, a first insulating tape 7 is affixed to the end of the battery cell 2 near the positive electrode tab 201, opposite to the positive electrode tab 201. The main function of the first insulating tape 7 is to provide electrical isolation. Inside the battery, the positive electrode tab 201 is the output terminal of the battery's positive electrode, directly connected to the positive electrode material of the battery cell 2. The presence of the first insulating tape 7 ensures electrical isolation between the positive electrode tab 201 and other components inside the battery that may pose a short-circuit risk (such as the negative electrode material of the battery cell, the casing, or the battery cover).
[0033] Furthermore, the end of the battery cell 2 furthest from the opening 102 is provided with a negative electrode tab 202, which is connected to the bottom of the outer casing 1. The negative electrode tab 202 is the lead-out end of the battery's negative electrode, which is usually directly connected to the negative electrode material of the battery cell 2, and then the negative electrode material of the battery cell 2 is connected to the external circuit to ensure that the battery can discharge normally.
[0034] Meanwhile, a second insulating tape 8 is attached to the end of the battery cell 2 closest to the negative electrode tab 202, with the second insulating tape 8 facing the negative electrode tab 202. The main function of the second insulating tape 8 is to provide electrical isolation, ensuring a safe electrical distance between the negative electrode tab 202 and other components inside the battery that may pose a short-circuit risk.
[0035] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0038] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.
Claims
1. A cylindrical explosion-proof battery, characterized by comprising: include: The outer shell has an internal cavity and an opening at one axial end that communicates with the cavity; The battery cell is housed within the receiving cavity and has a positive electrode tab; A terminal post, electrically connected to the positive electrode tab, having a preset thickness and configured to rupture when the internal pressure of the battery exceeds a preset threshold; A battery cover includes a cover plate and a cap. The cover plate covers the opening and has a through hole extending through it along its axial direction. The cap includes a cap body and an extension portion. The extension portion extends radially outward from the periphery of the cap body and abuts against a local area of the terminal post. The cap body passes through the through hole and protrudes outward, forming an exhaust channel with the terminal post. The cap body has at least one exhaust port, which connects the exhaust channel to the external environment.
2. The cylindrical explosion-proof battery according to claim 1, characterized by The thickness is 0.05mm to 0.25mm.
3. The cylindrical explosion-proof battery of claim 1, wherein The pole post has a protrusion, which is opposite to the exhaust channel.
4. The cylindrical explosion-proof battery according to claim 1, characterized in that, The number of exhaust ports is three, and the three exhaust ports are evenly arranged along the circumference of the cap body.
5. The cylindrical explosion-proof battery according to claim 1, characterized in that, It also includes an insulating seal, a portion of which abuts between the cover plate and the extension, and another portion abuts between the cover plate and the pole post.
6. The cylindrical explosion-proof battery according to claim 1, characterized in that, The end of the battery cell near the positive electrode tab is covered with a first insulating adhesive paper, which is opposite to the positive electrode tab.
7. The cylindrical explosion-proof battery according to claim 1, characterized in that, The end of the battery cell away from the opening is provided with a negative electrode tab, which is connected to the bottom of the outer casing.
8. The cylindrical explosion-proof battery according to claim 7, characterized in that, A second insulating tape is attached to one end of the battery cell near the negative electrode tab, and the second insulating tape is opposite to the negative electrode tab.