Lithium battery charger with safety structure

Abstract

The utility model relates to the technical field of lithium battery chargers, and discloses a lithium battery charger with a safety structure, which comprises a charging box, the front side of the charging box is detachably connected with a box cover, the middle part of the box cover is provided with a plug-in port, the input end of the plug-in port is provided with a cable, the outside of the plug-in port is provided with a safety mechanism, and the safety mechanism is connected with the charging box. The outer side of the exterior of the charging box is provided with a dismounting and mounting mechanism, the safety mechanism comprises a plurality of rotating piles, the close sides of the plurality of rotating piles are arranged on the outer side of the insertion port, the close sides of the two rotating piles are fixedly connected with rotating shafts, and the outer sides of the rotating shafts are rotatably connected with insulating insertion plates. According to the utility model, the mechanical automatic power-off protection for the overheat current of the charger is realized, so that the abnormal current can be quickly and reliably cut off without electronic control, the overload damage of the battery is effectively prevented, and meanwhile, the structure is simple and the maintenance is convenient.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery charger technology, and in particular to a lithium battery charger with a safety structure. Background Technology

[0002] Lithium-ion / lithium polymer batteries are charging devices specifically designed for lithium-ion / lithium polymer batteries. They achieve safe and efficient charging through intelligent control of current and voltage, and are primarily used in portable electronic devices such as smartphones, laptops, electric vehicles, and drones, as well as new energy vehicles. Their core functions include overcharge protection, temperature monitoring, and charging status management to ensure battery life and safety. With technological advancements, innovative features such as fast charging and wireless charging have further expanded their application scenarios.

[0003] In existing lithium battery chargers, overheat protection is typically achieved using electronic components to prevent damage from overheating current during charging. However, electronic components are not only expensive but also prone to failure in extreme environments, causing the protection mechanism to malfunction and increasing the risk of battery damage.

[0004] Therefore, to address the aforementioned problems, a lithium battery charger with a safety structure is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a lithium battery charger with a safety structure, which aims to improve the problem that the protection mechanism controlled by electronic components in the prior art is prone to failure in extreme environments.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A lithium battery charger with a safety structure includes a charging box, a box cover detachably connected to the front side of the charging box, a plug interface provided in the middle of the box cover, a cable provided at the input end of the plug interface, a safety mechanism provided outside the plug interface, and a disassembly mechanism provided on the outer side of the charging box.

[0008] The insurance mechanism includes multiple rotating posts, with one side of each rotating post located on the outside of the insertion interface. A rotating shaft is fixedly connected to the adjacent side of two rotating posts. An insulating insert plate is rotatably connected to the outside of the rotating shaft. A plug block is fixedly connected to the other end of the insulating insert plate. A feedback component is provided inside the insulating insert plate.

[0009] As a further description of the above technical solution:

[0010] The feedback component includes a fuse, the outer side of which is disposed inside the insulating plug, a resistor is disposed in the middle section of the fuse, and insulating sleeves are disposed on the outer sides of both ends of the fuse.

[0011] As a further description of the above technical solution:

[0012] The connector includes a connecting tube, the outer wall of which is fixedly connected to the middle of the box cover. One end of one or more of the rotating pins is fixedly connected to the outer side of the connecting tube. A socket is fixedly connected inside the connecting tube. A pressure ring is slidably connected to the inner side of the connecting tube. A push-out spring is sleeved on the outer side of the socket.

[0013] As a further description of the above technical solution:

[0014] One end of the ejector spring is fixedly connected to the outer wall of the pressure ring, and the other end of the ejector spring is fixedly connected to the inner wall of the connecting tube.

[0015] As a further description of the above technical solution:

[0016] The cable includes a coupling ring, one end of which is detachably connected to the outer end of the coupling tube. An electric wire is fixedly connected inside the coupling ring, and a plug is fixedly connected inside the coupling ring. The outer side of the plug is detachably connected to the inside of the socket, and the front end of the coupling ring contacts the outer side of the pressure ring.

[0017] As a further description of the above technical solution:

[0018] One end of the fuse is electrically connected to the outside of the wire, and the other end of the fuse is electrically connected to the outside of the pressure ring;

[0019] As a further description of the above technical solution:

[0020] The disassembly and assembly mechanism includes two fixing plates. The two fixing plates are fixedly connected to the two sides of the charging box on their adjacent sides respectively. A connecting post 1 is fixedly connected to the outer wall of the fixing plate, and a connecting post 2 is fixedly connected to the outer wall of the fixing plate. The other ends of the connecting post 1 and the connecting post 2 are detachably connected to the inside of the box cover. A plurality of fixing stakes 1 are fixedly connected to the outer side of the box cover. A limit rod is fixedly connected to the adjacent end of two fixing stakes 1. Two clamping strips are slidably connected to the outer side of the two limit rods. The shape of the adjacent side of the two clamping strips is adapted to the shape of the connecting post 1 and the connecting post 2. A drive assembly is fixedly connected to the outer side of the box cover.

[0021] As a further description of the above technical solution:

[0022] The drive assembly includes two fixed posts, the bottom ends of which are fixedly connected to the outside of the box cover. Positive and negative threaded rods are rotatably connected to the adjacent sides of the two fixed posts, and the middle parts of the two clamping bars are respectively threaded to the outer ends of the positive and negative threaded rods.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this utility model, by inserting the cable into the connector, the mating ring pushes the pressure ring to compress the ejector spring. At the same time, the insulating plate rotates, causing the plug block to engage with the slot of the mating ring. The torsion spring stores energy, the circuit is turned on, and charging begins. Part of the current flows through the fuse. When the current abnormally increases, the fuse melts due to resistance heating. The torsion spring releases energy, causing the insulating plate to rotate, causing the plug block to disengage from the slot, releasing the restriction on the ejector spring. The ejector spring rebounds, pushing the mating ring out of the connector, completely cutting off the circuit connection. This achieves mechanical automatic power-off protection against overheating current of the charger, thus quickly and reliably cutting off abnormal current without electronic control, effectively preventing battery overload damage. At the same time, the structure is simple and maintenance is convenient.

[0025] 2. In this utility model, by rotating the forward and reverse threaded rods to drive the two clamping bars to move in opposite directions, the locking of connecting post one and connecting post two can be released, and the cover can be removed for maintenance. After maintenance, the cover is reset, so that connecting post one and connecting post two pass through the corresponding holes of the cover. Then, the forward and reverse threaded rods are rotated in the opposite direction to make the clamping bars move towards each other, and the ends of the connecting posts are locked again, thus completing the quick fixation of the cover. This realizes the convenient disassembly and assembly of the lithium battery charger, thereby quickly completing the disassembly and assembly of the cover, improving maintenance efficiency and reducing maintenance difficulty. Attached Figure Description

[0026] Figure 1 This is a three-dimensional schematic diagram of a lithium battery charger with a safety structure proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of the safety mechanism of a lithium battery charger with a safety structure proposed in this utility model;

[0028] Figure 3 This is a schematic diagram of the disassembly and assembly mechanism of a lithium battery charger with a safety structure proposed in this utility model.

[0029] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0030] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0031] Legend:

[0032] 1. Charging box; 2. Box cover; 3. Socket; 301. Connecting pipe; 302. Socket; 303. Pressure ring; 304. Ejection spring; 4. Cable; 401. Connecting ring; 402. Wire; 403. Plug; 5. Safety mechanism; 501. Rotating post; 502. Rotating shaft; 503. Insulating plate; 504. Torsion spring; 505. Connecting block; 506. Fuse; 507. Resistor; 508. Insulating sleeve; 6. Assembly / disassembly mechanism; 601. Fixing plate; 602. Connecting post one; 603. Connecting post two; 604. Fixing post one; 605. Limiting rod; 606. Clamping bar; 607. Fixing post two; 608. Threaded rod (positive and negative). Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figure 1 and Figure 2 This utility model provides an embodiment of a lithium battery charger with a safety structure, comprising a charging box 1. A cover 2 is detachably connected to the front of the charging box 1, thereby reducing the overall disassembly steps and maintenance costs compared to traditional integrated chargers by adopting a split structure. A connector 3 is provided in the middle of the cover 2, and a cable 4 is provided at the input end of the connector 3. A safety mechanism 5 is provided on the outside of the connector 3. The external design of the safety mechanism 5 ensures that changes in status can be quickly observed in case of abnormalities. A disassembly / removal mechanism 6 is provided on the outer side of the charging box 1.

[0035] The connector 3 includes a connecting tube 301, whose outer wall is fixedly connected to the center of the cover 2. This connecting tube 301 guides the cable 4 into place and provides a sliding channel for the pressure ring 303 and the mating ring 401 to make tight contact. A socket 302 is fixedly connected inside the connecting tube 301, matching the plug 403 to enable current transmission. A pressure ring 303 is slidably connected to the inner side of the connecting tube 301. When the cable 4 is inserted, the pressure ring 303 is pushed by the mating ring 401, compressing the ejector spring 304, and ejected by the spring force after the fuse 506 blows. An ejector spring 304 is fitted on the outer side of the socket 302. The ejector spring 304 provides a rebound force, pushing out the mating ring 401 after the fuse 506 blows, thus cutting off the circuit.

[0036] Cable 4 includes a mating ring 401, one end of which is detachably connected to the outer end of mating connector 301. The mating ring 401 connects cable 4 to connector 3, pushes pressure ring 303, and secures insulating insert 503. An electrical wire 402 is fixedly connected inside the mating ring 401, guiding current. A plug 403 is also fixedly connected inside the mating ring 401, for insertion into socket 302 to complete the circuit connection. The outer side of plug 403 is detachably connected to the inside of socket 302, and the front end of mating ring 401 contacts the outer side of pressure ring 303.

[0037] Reference Figure 1 , Figure 2 and Figure 4 The safety mechanism 5 includes multiple rotating posts 501. The adjacent ends of the rotating posts 501 are fixedly connected to the outside of the connector 301. The rotating posts 501 are used to fix the rotating shaft 502, allowing the insulating plate 503 to rotate. A rotating shaft 502 is fixedly connected to the adjacent side of two rotating posts 501, supporting the rotational movement of the insulating plate 503. The insulating plate 503 is rotatably connected to the outside of the rotating shaft 502. The insulating plate 503 provides installation space for the subsequent fuse 506 and, under normal working conditions, ensures the stability of the connection between the cable 4 and the connector 3. A plug block 505 is fixedly connected to the other end of the insulating plate 503. The plug block 505 engages with the slot of the connector ring 401, fixing the position of the insulating plate 503 and ensuring normal power supply. A feedback component is installed inside the insulating plate 503.

[0038] The feedback component includes a fuse 506, which is located inside the insulating insert 503. The fuse 506 is connected in series in the circuit and melts when the current is too high, triggering the power-off mechanism. A resistor 507 is located in the middle of the fuse 506. The resistor 507 increases the local heat generation of the fuse 506, accelerating the melting reaction. The resistor 507 uses an M-effect alloy resistance wire to achieve a non-linear temperature rise curve, preventing accidental triggering. Insulating sleeves 508 are located on the outer sides of both ends of the fuse 506 to prevent arcing or short circuits when the fuse 506 melts. One end of the fuse 506 is electrically connected to the outside of the wire 402, and the other end is electrically connected to the outside of the pressure ring 303. This parallel connection ensures the continuity of the main current path and does not affect the total current output during normal operation of the charger.

[0039] Reference Figure 1 , Figure 3 and Figure 5The disassembly / assembly mechanism 6 includes two fixing plates 601. The adjacent sides of the two fixing plates 601 are fixedly connected to both sides of the charging box 1. The fixing plates 601 support connecting post one 602 and connecting post two 603. Connecting post one 602 and connecting post two 603 are fixedly connected to the outer wall of fixing plate 601. The other ends of connecting post one 602 and connecting post two 603 are detachably connected to the inside of the box cover 2. Connecting post one 602 and connecting post two 603 not only achieve initial docking with the box cover 2 but also enhance the structural strength of the charger itself. Multiple fixing posts one 604 are fixedly connected to the outer side of the box cover 2. A limiting rod 605 is fixedly connected to the adjacent ends of two fixing posts one 604. The limiting rod 605 restricts the movement direction of the clamping bar 606, allowing it to slide only along the limiting rod 605. Two clamping bars 606 are slidably connected to the outer sides of the two limiting rods 605. The shape of the adjacent side of the two clamping bars 606 is adapted to the shape of the first connecting post 602 and the second connecting post 603. The clamping bars 606 lock or release the first connecting post 602 and the second connecting post 603 by moving towards or away from each other, thereby fixing or removing the box cover 2. A drive assembly is fixedly connected to the outer side of the box cover 2.

[0040] The drive assembly includes two fixing posts 607, the bottom ends of which are fixedly connected to the outside of the cover 2. The fixing posts 607 support the rotation of the threaded rods 608. The threaded rods 608 are rotatably connected to the adjacent sides of the two fixing posts 607. The middle portions of the two clamping bars 606 are threaded to the outer ends of the threaded rods 608. When the threaded rods 608 rotate, they drive the two clamping bars 606 to move synchronously in opposite directions, thereby enabling the quick assembly and disassembly of the cover 2.

[0041] Working principle: During use, cable 4 is inserted into connector 3, ensuring tight contact between mating ring 401 and connector 301. Simultaneously, mating ring 401 presses pressure ring 303 into the connector 301, compressing spring 304. At the same time, insulating plate 503 is rotated to a designated position, engaging the insertion block 505 on insulating plate 503 with the slot on mating ring 401. At this point, torsion spring 504 is in a stored-energy state. The other end of fuse 506 is then passed through mating ring 401 and connected to wire 402. Charging box 1 is then opened to begin charging. Due to the resistor 507, a portion of the current flows through fuse 506.

[0042] When the current is too high, the fuse 506 melts due to excessive heat at resistor 507, causing the entire fuse 506 to melt. At this time, the torsion spring 504 recovers its deformation and releases elastic potential energy, causing the insulating insert plate 503 to rotate in the opposite direction, causing the plug block 505 to disengage from the docking ring 401. Consequently, the ejector spring 304 recovers its deformation without being affected by resistance, pushing the entire docking ring 401 out of the docking tube 301. This achieves automatic disconnection of the connection through thermal feedback when the lithium battery charger malfunctions and the charging current is too high, thereby protecting the lithium battery.

[0043] When internal maintenance of the lithium battery charger is required, rotating the forward and reverse threaded rod 608 causes the two clamping bars 606 to move in opposite directions. Simultaneously, the limiting rod 605 prevents the clamping bars 606 from rotating synchronously with the forward and reverse threaded rod 608. This back-to-back movement of the two clamping bars unlocks connecting post one 602 and connecting post two 603, allowing the entire cover 2 to be removed. After maintenance, the cover 2 is returned to its original position, allowing connecting post one 602 and connecting post two 603 to pass through the cover 2. Reversing the forward and reverse threaded rod 608 causes the two clamping bars 606 to move towards each other under the constraint of the limiting rod 605, thus locking the ends of connecting post one 602 and connecting post two 603, securing the cover 2. This facilitates convenient disassembly and assembly of the entire lithium battery charger for easy maintenance.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lithium battery charger with safety structure comprising a charging box (1), characterized in that: The front side of the charging box (1) is detachably connected to a box cover (2), and a plug-in interface (3) is provided in the middle of the box cover (2). A cable (4) is provided at the input end of the plug-in interface (3). A safety mechanism (5) is provided on the outside of the plug-in interface (3). A disassembly and assembly mechanism (6) is provided on the outer side of the charging box (1). The insurance mechanism (5) includes multiple rotating posts (501), with one side of each rotating post (501) located on the outside of the plug interface (3). Two rotating posts (501) are fixedly connected to a rotating shaft (502) on the side of each rotating post (501). An insulating plug plate (503) is rotatably connected to the outside of the rotating shaft (502). A plug block (505) is fixedly connected to the other end of the insulating plug plate (503). A feedback component is provided inside the insulating plug plate (503).

2. The lithium battery charger with safety structure according to claim 1, characterized in that: The feedback component includes a fuse (506), the outer side of which is disposed inside the insulating plug plate (503), a resistor (507) is disposed in the middle section of the fuse (506), and insulating sleeves (508) are disposed on the outer sides of both ends of the fuse (506).

3. The lithium battery charger with safety structure according to claim 2, characterized in that: The connector (3) includes a connecting tube (301), the outer wall of which is fixedly connected to the middle of the cover (2), and the near ends of the plurality of rotating posts (501) are fixedly connected to the outside of the connecting tube (301). A socket (302) is fixedly connected inside the connecting tube (301), and a pressure ring (303) is slidably connected to the inner side of the connecting tube (301). A push-out spring (304) is sleeved on the outer side of the socket (302).

4. The lithium battery charger with safety structure according to claim 3, characterized in that: One end of the ejector spring (304) is fixedly connected to the outer wall of the pressure ring (303), and the other end of the ejector spring (304) is fixedly connected to the inner wall of the connecting tube (301).

5. The lithium battery charger with safety structure according to claim 4, characterized in that: The cable (4) includes a docking ring (401), one end of which is detachably connected to the outer end of the docking connector (301). An electric wire (402) is fixedly connected inside the docking ring (401), and a plug (403) is fixedly connected inside the docking ring (401). The outer side of the plug (403) is detachably connected to the inside of the socket (302). The front end of the docking ring (401) contacts the outer side of the pressure ring (303).

6. The lithium battery charger with safety structure according to claim 5, characterized in that: One end of the fuse (506) is electrically connected to the outside of the wire (402), and the other end of the fuse (506) is electrically connected to the outside of the pressure ring (303).

7. The lithium battery charger with safety structure according to claim 1, wherein: The disassembly and assembly mechanism (6) includes two fixing plates (601). The two fixing plates (601) are fixedly connected to the two sides of the charging box (1) on their adjacent sides respectively. A connecting post 1 (602) is fixedly connected to the outer wall of the fixing plate (601), and a connecting post 2 (603) is fixedly connected to the outer wall of the fixing plate (601). The other ends of the connecting post 1 (602) and the connecting post 2 (603) are detachably connected to the inside of the box cover (2). A plurality of fixing stakes 1 (604) are fixedly connected to the outer side of the box cover (2). A limit rod (605) is fixedly connected to the adjacent end of the two fixing stakes 1 (604). Two clamping strips (606) are slidably connected to the outer side of the two limit rods (605). The shape of the adjacent side of the two clamping strips (606) is adapted to the shape of the connecting post 1 (602) and the connecting post 2 (603). A drive assembly is fixedly connected to the outer side of the box cover (2).

8. The lithium battery charger with safety structure according to claim 7, characterized in that: The drive assembly includes two fixed posts (607), the bottom ends of which are fixedly connected to the outside of the cover (2). A positive and negative threaded rod (608) is rotatably connected to the adjacent side of the two fixed posts (607), and the middle parts of the two clamping bars (606) are respectively threaded to the outside of the two ends of the positive and negative threaded rod (608).

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