A mobile power supply overheat automatic power-off protection device

Abstract

The utility model discloses a kind of mobile power supply overheating automatic power-off protection devices, involve power-off protection technical field.The utility model includes sliding sleeve and fixed shell, the inside movable sleeve joint of sliding sleeve has driver, the top of fixed shell is detachably fixedly connected with the baffle of circular ring, the bottom of sliding sleeve is fixedly connected with apron, the outside movable sleeve joint of sliding sleeve has push spring, the bottom of the inner chamber of fixed shell and apron is separately fixedly connected with fixed pole piece and movable pole piece;Driver includes the gas cylinder of movable sleeve in sliding sleeve, the inside movable sleeve joint of gas cylinder has piston, the top of gas cylinder is fixedly connected with cover, the center of cover movable sleeve joint has top rod, the top of top rod is fixedly connected in sliding sleeve inner chamber top.The utility model is driven by the mode of nitrogen thermal expansion mechanical structure action, realize the mobile power supply overheating automatic power-off function without relying on electronic component, guarantee the mobile power supply use safety.

Description

Technical Field

[0001] This utility model belongs to the field of power failure protection technology, and in particular relates to an automatic power failure protection device for overheating of a mobile power supply. Background Technology

[0002] A power bank is a portable power supply device with a built-in rechargeable battery as its core energy storage unit. It can provide temporary power to various small electronic devices such as smartphones, tablets, and wireless headphones through common interfaces such as USB and Type-C. Due to its portability and emergency power supply capabilities, it has been widely used in daily commutes, long-distance travel, outdoor work, and disaster emergencies. However, during use, factors such as prolonged high-power discharge, abnormally high input current during charging, battery aging after long-term cycling, and exposure to high temperatures can all cause a sharp increase in its internal temperature. Excessive temperature may cause the battery to bulge and leak, and in severe cases, it may trigger thermal runaway, leading to the power bank catching fire or exploding. At the same time, overheating can also burn components such as resistors and capacitors in the internal circuitry, causing permanent damage to the device. It may even burn the user due to the high temperature conducted by the outer shell, posing a direct threat to personal safety and surrounding property. Most of the overheat protection solutions currently used in power banks on the market rely on electronic components to build the protection mechanism. Common forms include "temperature sensor + MCU (microcontroller unit)" intelligent power-off modules, one-time fuses, and semiconductor temperature control switches. However, temperature sensors are susceptible to environmental influences and performance degradation. Long-term exposure to high and low temperature cycles can lead to decreased detection accuracy and temperature threshold drift, which may result in false power-off during normal use or failure to respond in time when overheating due to detection lag. In addition, both the MCU control module and the semiconductor temperature control switch rely on the internal circuitry of the power bank for power supply. If the power bank experiences a power outage due to battery short circuit, circuit failure, or other issues, the protection module will fail simultaneously, losing its overheat protection function.

[0003] To address this issue, we provide a mobile power bank overheat automatic power-off protection device. Utility Model Content

[0004] The purpose of this utility model is to provide an automatic power-off protection device for overheating of a power bank. The device uses nitrogen stored in the gas cylinder inside the driver to expand when heated, which pushes the piston and push rod to move the sliding sleeve, causing the movable electrode at the bottom of the skirt plate to separate from the fixed electrode in the fixed shell. This solves the problem that existing power bank overheat protection devices rely heavily on electronic components and are prone to failure due to high-temperature aging.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is a mobile power bank overheat automatic power-off protection device, including a sliding sleeve and a fixed shell. The sliding sleeve is movably fitted with a driver, and the driver is fixedly connected to the inside of the fixed shell. The top of the fixed shell is detachably fixedly connected with a ring-shaped baffle, and the sliding sleeve is movably fitted inside the baffle. The bottom of the sliding sleeve is fixedly connected with a skirt plate, and the outside of the sliding sleeve is movably fitted with a push spring, and the push spring is located between the skirt plate and the baffle plate. The bottom of the inner cavity of the fixed shell and the bottom of the skirt plate are respectively fixedly connected with a fixed electrode plate and a movable electrode plate. The actuator includes an air reservoir that is movably fitted inside the sliding sleeve, and the air reservoir stores nitrogen gas. A piston is movably fitted inside the air reservoir. A cap is fixedly connected to the top of the air reservoir. A push rod is movably fitted at the center of the cap. The piston is fixedly connected to the bottom of the push rod. The top of the push rod is fixedly connected to the top of the inner cavity of the sliding sleeve.

[0006] The present invention is further configured such that a one-way valve for injecting nitrogen into the gas storage cylinder is installed at the bottom of the gas storage cylinder, and the gas pressure inside the gas storage cylinder is 0.15MPa.

[0007] The present invention is further configured such that the top of the cover and the sliding sleeve are respectively provided with a through first vent hole and a second vent hole, and the second vent hole is opposite to the first vent hole.

[0008] The present invention is further configured such that an L-shaped lower terminal and an upper terminal are fixedly connected to the outside of the fixed electrode and the movable electrode, respectively, and the lower terminal and the upper terminal are symmetrical.

[0009] The present invention is further configured such that a sliding opening is provided on the outside of the fixed shell, and the upper wiring terminal is slidably connected to the inside of the sliding opening.

[0010] The present invention is further configured such that a connecting ring is fixedly connected to the top of the fixed shell, and a mounting bracket is detachably fixedly connected to the bottom of the connecting ring.

[0011] The present invention is further configured such that lubricating oil is applied between the air storage cylinder and the sliding sleeve, and the inner diameter of the baffle is larger than the outer diameter of the sliding sleeve.

[0012] The present invention has the following beneficial effects: The present invention achieves the function of automatic power-off when the power bank is overheated without relying on electronic components by driving the mechanical structure through the thermal expansion of nitrogen. This avoids the risk of protection failure caused by the aging and failure of electronic components, improves the reliability of the device, and ensures the safety of the power bank. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0016] Figure 3 This is a schematic diagram of the exploded structure of this utility model.

[0017] The attached diagram lists the components represented by each number as follows: 100. Driver; 101. Air reservoir; 102. Cover; 102a. First vent; 103. Piston; 104. Push rod; 105. One-way valve; 200. Sliding sleeve; 201. Skirt; 202. Second vent; 300. Fixed housing; 301. Connecting ring; 302. Sliding port; 400. Baffle; 500. Fixed electrode; 501. Lower terminal; 600. Movable electrode; 601. Upper terminal; 700. Push spring; 800. Mounting bracket. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0019] Example 1 Please see Figures 1 to 3 This utility model relates to an automatic overheat protection device for a portable power bank, comprising a sliding sleeve 200 and a fixed shell 300. A driver 100 is movably fitted inside the sliding sleeve 200, and the driver 100 is fixedly connected inside the fixed shell 300. A circular baffle 400 is detachably fixedly connected to the top of the fixed shell 300, and the sliding sleeve 200 is movably fitted inside the baffle 400. A skirt 201 is fixedly connected to the bottom of the sliding sleeve 200. A push spring 700 is movably fitted outside the sliding sleeve 200, and the push spring 700 is located between the skirt 201 and the baffle 400. The fixed shell 300... The bottom of the inner cavity and the bottom of the skirt plate 201 are respectively fixedly connected to the fixed electrode 500 and the movable electrode 600. Through the movable sleeve 200 and the fixed shell 300, a stable moving base is provided for the power-off action of the device. The detachable baffle 400 facilitates the installation, maintenance and replacement of internal components such as the sliding sleeve 200 and the push spring 700. Under normal temperature, the push spring 700 can press the skirt plate 201 with its own elasticity, so that the movable electrode 600 and the fixed electrode 500 are in close contact, ensuring the normal conduction of the mobile power supply circuit. At the same time, after the power is cut off due to overheating, it also provides elastic support for subsequent reset. The driver 100 includes a gas cylinder 101 movably fitted inside the sliding sleeve 200, and the gas cylinder 101 stores nitrogen gas. A piston 103 is movably fitted inside the gas cylinder 101. A cover 102 is fixedly connected to the top of the gas cylinder 101. A push rod 104 is movably fitted at the center of the cover 102. The piston 103 is fixedly connected to the bottom of the push rod 104. The top of the push rod 104 is fixedly connected to the top of the inner cavity of the sliding sleeve 200. The nitrogen gas in the gas cylinder 101 has good thermal expansion characteristics. When the mobile power supply overheats, the nitrogen gas expands due to heat and can push the piston 103 to move upward. In turn, the push rod 104 drives the sliding sleeve 200 to move synchronously, realizing the separation of the movable electrode 600 and the fixed electrode 500, completing the automatic power-off. It does not rely on electronic components, avoids the protection failure problem caused by the aging and failure of electronic components, and improves the reliability of the device.

[0020] Specifically, a one-way valve 105 for injecting nitrogen into the gas storage cylinder 101 is installed at the bottom of the cylinder, and the internal gas pressure of the gas storage cylinder 101 is 0.15MPa. The one-way valve 105 can realize one-way injection of nitrogen, prevent nitrogen leakage in the gas storage cylinder 101, and facilitate subsequent nitrogen replenishment, ensuring the stability of the device in long-term use. The initial gas pressure setting of 0.15MPa can ensure that nitrogen will not expand excessively within the normal operating temperature range of the power supply, thus preventing false power-off. Only when the temperature rises to the set overheat threshold can the pressure generated by the expansion of nitrogen push the piston 103 to move, improving the triggering accuracy of the protection device. The top of the cover 102 and the sliding sleeve 200 are respectively provided with a through first vent hole 102a and a second vent hole 202, and the second vent hole 202 is opposite to the first vent hole 102a. The opposite arrangement of the first vent hole 102a and the second vent hole 202 can realize the pressure balance between the top space of the gas storage cylinder 101 and the outside, so as to avoid the gas pressure in the top space being too high when the nitrogen in the gas storage cylinder 101 expands, which would hinder the piston 103 from moving upward and ensure the response speed of the driver 100.

[0021] Furthermore, the fixed electrode 500 and the movable electrode 600 are respectively fixedly connected to the outside of an L-shaped lower terminal 501 and an upper terminal 601, and the lower terminal 501 and the upper terminal 601 are symmetrical. The L-shaped lower terminal 501 and the upper terminal 601 facilitate connection with the internal circuit of the power bank and reduce wiring difficulty; the symmetrical design can prevent short circuits. The fixed housing 300 has a sliding opening 302 on its exterior, and the upper terminal 601 is slidably connected to the interior of the sliding opening 302.

[0022] The operation process of this embodiment is as follows: When the internal temperature of the power bank is too high, the nitrogen gas stored in the gas cylinder 101 increases in volume and pressure due to thermal expansion. At this time, the first vent hole 102a on the cover 102 and the second vent hole 202 on the sliding sleeve 200 cooperate to quickly balance the air pressure between the top space of the gas cylinder 101 and the outside air pressure, preventing the top air pressure from hindering the movement of the piston 103. The expanding nitrogen gas continuously pushes the piston 103 inside the gas cylinder 101 to move upward. The piston 103 drives the push rod 104 fixedly connected to it to move upward synchronously. The push rod 104 then pulls the sliding sleeve 200. The 0 slides upward along the outer wall of the gas storage cylinder 101, while simultaneously moving smoothly along the inner wall of the baffle 400; when the sliding sleeve 200 moves upward, the skirt 201 at its bottom moves upward accordingly, and the movable electrode 600 at the bottom of the skirt 201 separates from the fixed electrode 500 at the bottom of the inner cavity of the fixed shell 300. At the same time, the upper terminal 601 on the outer side of the movable electrode 600 slides upward along the sliding opening 302 of the fixed shell 300; when the movable electrode 600 separates from the fixed electrode 500, the internal circuit of the mobile power supply connected through the lower terminal 501 and the upper terminal 601 is disconnected, realizing overheat power-off protection.

[0023] Example 2 Please see Figures 1 to 3 Based on the first specific embodiment, a connecting ring 301 is fixedly connected to the top of the fixed shell 300, and a mounting bracket 800 is detachably fixedly connected to the bottom of the connecting ring 301.

[0024] The operation process of this embodiment is as follows: the connecting ring 301 can serve as a connection transition structure between the fixed shell 300 and the mounting bracket 800, thereby improving the connection stability; the detachable mounting bracket 800 facilitates the quick installation of the entire overheat protection device into the power bank, and also facilitates the subsequent disassembly, maintenance or replacement of the device.

[0025] Example 3 Please see Figures 1 to 3 Based on specific embodiment one and specific embodiment two, lubricating oil is applied between the air storage cylinder 101 and the sliding sleeve 200, and the inner diameter of the baffle 400 is larger than the outer diameter of the sliding sleeve 200.

[0026] The operation process of this embodiment is as follows: the lubricating oil between the gas storage cylinder 101 and the sliding sleeve 200 can greatly reduce the friction when they move relative to each other, avoid the nitrogen expansion force from not being able to smoothly push the sliding sleeve 200 to move due to excessive frictional resistance, ensure the timeliness and smoothness of the power-off action when overheating, reduce component wear, and extend the service life of the device; the inner diameter of the baffle 400 is larger than the outer diameter of the sliding sleeve 200, providing sufficient space for the sliding sleeve 200 to move up and down inside the baffle 400, preventing jamming between the sliding sleeve 200 and the baffle 400, and further ensuring the reliability of the device operation.

[0027] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A mobile power bank overheat automatic power-off protection device, characterized in that: The device includes a sliding sleeve (200) and a fixed shell (300). The sliding sleeve (200) is movably fitted with a driver (100), and the driver (100) is fixedly connected to the inside of the fixed shell (300). The top of the fixed shell (300) is detachably fixedly connected with a ring-shaped baffle (400). The sliding sleeve (200) is movably fitted inside the baffle (400). The bottom of the sliding sleeve (200) is fixedly connected with a skirt (201). The outside of the sliding sleeve (200) is movably fitted with a push spring (700), and the push spring (700) is located between the skirt (201) and the baffle (400). The bottom of the inner cavity of the fixed shell (300) and the bottom of the skirt (201) are respectively fixedly connected with a fixed electrode (500) and a movable electrode (600). The driver (100) includes a gas storage cylinder (101) movably fitted inside the sliding sleeve (200), and the gas storage cylinder (101) stores nitrogen gas. A piston (103) is movably fitted inside the gas storage cylinder (101). A cap (102) is fixedly connected to the top of the gas storage cylinder (101). A push rod (104) is movably fitted at the center of the cap (102). The piston (103) is fixedly connected to the bottom of the push rod (104). The top of the push rod (104) is fixedly connected to the top of the inner cavity of the sliding sleeve (200).

2. The mobile power bank overheat automatic power-off protection device according to claim 1, characterized in that, The bottom of the gas storage cylinder (101) is equipped with a one-way valve (105) for injecting nitrogen into the gas storage cylinder (101), and the gas pressure inside the gas storage cylinder (101) is 0.15 MPa.

3. The mobile power bank overheat automatic power-off protection device according to claim 1, characterized in that, The top of the cover (102) and the sliding sleeve (200) are respectively provided with a through first vent hole (102a) and a second vent hole (202), and the second vent hole (202) is opposite to the first vent hole (102a).

4. The mobile power bank overheat automatic power-off protection device according to claim 1, characterized in that, The fixed electrode (500) and the movable electrode (600) are respectively fixedly connected to an L-shaped lower terminal (501) and an upper terminal (601), and the lower terminal (501) and the upper terminal (601) are symmetrical about each other.

5. The mobile power bank overheat automatic power-off protection device according to claim 1, characterized in that, The fixed housing (300) has a sliding opening (302) on its outside, and the upper terminal (601) is slidably connected to the inside of the sliding opening (302).

6. The mobile power bank overheat automatic power-off protection device according to claim 1, characterized in that, The top of the fixed housing (300) is fixedly connected to a connecting ring (301), and the bottom of the connecting ring (301) is detachably fixedly connected to a mounting bracket (800).

7. The mobile power bank overheat automatic power-off protection device according to claim 1, characterized in that, Lubricating oil is applied between the gas storage cylinder (101) and the sliding sleeve (200), and the inner diameter of the baffle (400) is larger than the outer diameter of the sliding sleeve (200).

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