Storage battery open circuit protection device

Abstract

The invention discloses a storage battery open circuit protection device, and relates to the technical field of storage batteries. The terminal locking device comprises a main case, a display panel, a communication antenna, a line interface, a control button and a terminal locking mechanism are arranged on the side face of the main case, and the communication antenna, the line interface, the control button and the terminal locking mechanism are arranged on the side face of the main case. An overload alarm device is arranged in the main machine shell, and a cable sealing structure is arranged on the side face of the main machine shell. Through arrangement of the transmission cavity, the first transmission shaft and the worm in the terminal locking mechanism, the lower pressing plate drives the thorns to be accurately embedded between the clamping plates, stable locking of the cable end is achieved, the cable head is effectively prevented from loosening or falling off due to vibration or external force in the use process, the open circuit problem caused by poor contact is avoided, and the service life of the cable head is prolonged. And the stability and the reliability of the whole circuit system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of storage batteries, in particular to a storage battery open circuit protection device. BACKGROUND

[0002] The open circuit protection device is a circuit safety component. When a line open circuit (disconnection) fault is detected, the circuit is quickly cut off or an alarm is sent to avoid damage to the equipment due to power failure, circuit overheating and fire. It is widely used in power systems and electrical equipment to ensure electrical safety and equipment stability.

[0003] The application No. CN103812098B discloses a current transformer secondary open circuit protection device, which comprises an insulating upper cover, a PCB control board and an insulating lower cover. A load terminal, a normally closed and open switch, an indicator light and a transformer terminal are welded on the PCB control board. The load terminal is connected with a load, and the transformer terminal is connected with a transformer. When the normally closed and open switch is in a normally closed state, the transformer is directly connected with the load. When the normally closed and open switch is in a normally open state, the transformer is connected at both ends. The application is simple to operate. Only the normally closed and open switch is used to connect the current transformer at both ends. After confirming that the current transformer at both ends has been connected, the current transformer can be safely connected.

[0004] In the above application, although a current transformer secondary open circuit protection device is provided, the normally closed and open switch is used to realize the connection and disconnection of the current transformer at both ends, thereby ensuring the safety of the operation to a certain extent. However, the device still has some limitations in practical application, such as lacking effective mechanical locking structure to prevent cable loosening or falling off, which may cause poor contact due to vibration or external force, thereby causing open circuit problems. Moreover, when the circuit is overloaded, the device cannot timely and effectively alarm and quickly repair, which may further damage the equipment and circuit. Therefore, the present application provides a storage battery open circuit protection device. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a storage battery open circuit protection device to solve the problems in the background art.

[0006] To achieve the above purpose, the present application realizes the following technical scheme: a storage battery open circuit protection device comprises a main shell, a display panel is arranged on the side surface of the main shell, a communication antenna is arranged on the side surface of the main shell, a line interface is arranged on the side surface of the main shell, a control button is arranged on the side surface of the main shell, a terminal locking mechanism is arranged on the side surface of the main shell, an overload alarm device is arranged in the main shell, and a cable sealing structure is arranged on the side surface of the main shell.

[0007] The terminal locking mechanism comprises a transmission cavity, which is arranged on the side of the main shell, the inner wall of the transmission cavity is through and rotationally connected with a first transmission shaft, the circumferential surface of the first transmission shaft is fixedly connected with a worm, the bottom of the transmission cavity is through and rotationally connected with a threaded rod one, the circumferential surface of the threaded rod one is threadedly connected with a first threaded sleeve, the circumferential surface of the first threaded sleeve is fixedly connected with a moving plate one, the bottom of the moving plate one is fixedly connected with a jacking post, the end of the jacking post away from the moving plate one is fixedly connected with a pressing plate, the inner bottom of the main shell is fixedly connected with a wiring board, the bottom of the pressing plate is fixedly connected with a pointed needle, the top of the wiring board is fixedly connected with a clamping plate, the inside of the main shell is provided with a sliding limiting cavity, one end of the threaded rod one is fixedly connected with a worm wheel, and one end of the first transmission shaft is fixedly connected with a locking head.

[0008] According to the above technical scheme, the number of the pointed needles and the clamping plates is set to be several, the side surface of the clamping plate is located on the displacement track of the circumferential surface of the pointed needle, so that the pointed needle is closely embedded between the clamping plates, the stable locking of the terminal is realized, the cable head is effectively prevented from loosening or falling off, and the open circuit problem caused by poor contact is avoided.

[0009] According to the above technical scheme, the number of the jacking posts is set to be two, the two groups of jacking posts are mutually symmetrical along the vertical central axis of the threaded rod one, and the side surface of the pressing plate is slidingly connected with the inner wall of the sliding limiting cavity, so that the pressing plate is kept stable during movement and cannot be deviated, and the pointed needle can be accurately embedded between the clamping plates, and the reliability of the locking of the cable head is improved.

[0010] According to the above technical scheme, the worm and the worm wheel are mutually engaged, the transmission cavity is located above the sliding limiting cavity, and the circumferential surface of the threaded rod one is through and rotationally connected with the bottom of the transmission cavity, so that the accurate adjustment of the position of the pressing plate is realized, and the locking force of the terminal is moderate, and the cable head is not damaged due to over-tight locking.

[0011] According to the technical scheme, the overload alarm device comprises an overload protection cavity, the overload protection cavity is arranged in the interior of the main machine shell, the top of the wiring board is fixedly connected with a conductive cable, the end of the first transmission shaft away from the locking head is fixedly connected with a second threaded rod, the circumferential surface of the second threaded rod is threadedly connected with a second threaded sleeve, the circumferential surface of the second threaded sleeve is fixedly connected with a moving plate II, the side surface of the moving plate II is fixedly connected with a locking box, the top of the locking box is fixedly connected with a screw, the interior of the locking box is provided with a thermal expansion spring, the top of the wiring board is fixedly connected with a limiting groove, the top of the overload protection cavity is provided with a trigger switch, and the top of the main machine shell is provided with a signal lamp, so that the user can be reminded of the specific circuit overload and problems, so that the user can take timely measures for processing, the damage of the storage battery or other electrical equipment caused by the overload is avoided, and the safety and stability of the entire circuit system are effectively ensured.

[0012] According to the technical scheme, the top of the main machine shell is provided with a replacement groove, and the inner wall of the replacement groove is hingedly connected with an opening and closing cover, so that the user can conveniently replace and maintain the internal elements such as the thermal expansion spring, without the need to disassemble the entire device, the maintenance efficiency is greatly improved, and the maintenance cost is reduced.

[0013] According to the technical scheme, the trigger end of the trigger switch is located on the displacement track at the top of the thermal expansion spring, and the trigger switch is electrically connected with the signal lamp, so that the user can be directly reminded of the overload problem of the circuit.

[0014] According to the technical scheme, the replacement groove is located above the thermal expansion spring, and the side surface of the thermal expansion spring is slidably connected with the inner wall of the limiting groove, so that the thermal expansion spring can stably move along the limiting groove when being heated and expanded, the trigger switch can accurately sense the displacement change, and the signal lamp can be triggered in time to alarm.

[0015] According to the technical scheme, the cable sealing structure comprises a stroke plate, the stroke plate is fixedly connected to the side surface of the main machine shell, the inner wall of the stroke plate is slidably connected with a baffle, the side surface of the baffle is fixedly connected with a sealing ring, the side surface of the baffle is provided with a stroke groove, and the side surface of the lower pressing plate is fixedly connected with a stroke column, so that the sealing ring is tightly attached to the cable, foreign matters such as dust and moisture in the external environment are effectively prevented from entering the interior of the main machine shell, the problems of circuit short circuit or element damage caused by the invasion of foreign matters are avoided, and the reliability and service life of the device are improved.

[0016] According to the technical scheme, the circumferential surface of the stroke column is slidably connected with the inner wall of the stroke groove, the number of baffles is two, the side surface of one baffle is located on the displacement track of the side surface of the other baffle, and the circumferential surface of the stroke column penetrates through and is slidably connected with the side surface of the main machine shell, so that the adverse effects of external environmental factors on the internal circuit of the device are prevented.

[0017] The application provides a battery open circuit protection device. (1) The transmission cavity, the first transmission shaft and the worm in the terminal locking mechanism are arranged, so that the lower pressing plate drives the sharp to be accurately embedded between the clamping plates, the cable end is stably locked, the loosening or falling of the cable head due to vibration or external force in use is effectively prevented, the open circuit problem caused by poor contact such as contact is avoided, and the stability and reliability of the entire circuit system are improved. Since the transmission ratio of the worm and the worm wheel is stable, and the worm wheel and worm transmission has self-locking property, the lower pressing plate cannot be moved by itself at the locking position due to external force, and the stability of the terminal locking is further enhanced.

[0018] (2) The overload protection cavity, the conductive cable and the second threaded rod in the overload alarm device are arranged, so that when the circuit is overloaded, the conductive cable generates too much heat due to excessive current, the heat is transferred to the thermal expansion spring, the thermal expansion spring is expanded by heat, and the trigger switch is electrically connected with the signal lamp, the signal lamp is turned on after the trigger switch is triggered, so that the user is directly reminded that the circuit has an overload problem, so that the user can take measures in time to process, avoid damaging the battery or other electrical equipment due to overload, effectively guarantee the safety and stability of the entire circuit system, and the assembly is convenient to replace the groove and the opening and closing cover, the user can conveniently replace and maintain the internal elements such as the thermal expansion spring, without disassembling the entire device. This not only greatly improves the maintenance efficiency, but also reduces the maintenance cost.

[0019] (3) The stroke plate, the baffle and the sealing ring in the cable sealing structure are arranged, so that when the cable is connected to the device, the stroke column slides in the stroke groove along with the movement of the lower pressing plate, and then drives the two baffles to approach each other, so that the sealing ring closely adheres to the surface of the cable, effectively blocks the impurities such as dust and moisture in the outside from entering the inside of the main machine shell, avoids the circuit short circuit or element damage problem caused by impurities invasion, and improves the reliability and service life of the device. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic view of the whole application; Figure 2 It is a schematic view of the whole application; Figure 3 It is a schematic view of the internal section of the application; Figure 4 It is a schematic view of the transmission cavity of the application; Figure 5 It is a schematic view of the terminal locking mechanism of the application; Figure 6Figure 1 is a schematic view of the cable sealing structure of the present application. Figure 7 Figure 1 is a schematic view of the cable sealing structure of the present application.

[0021] In the figure: 1, main shell; 2, display panel; 3, communication antenna; 4, line interface; 5, control button; 6, terminal locking mechanism; 601, transmission cavity; 602, first transmission shaft; 603, worm; 604, threaded rod one; 605, first threaded sleeve; 606, moving plate one; 607, top column; 608, lower pressing plate; 609, wiring board; 610, thorn; 611, card; 612, sliding limit cavity; 613, worm gear; 614, locking head; 7, overload alarm device; 701, overload protection cavity; 702, conductive cable; 703, second threaded rod; 704, second threaded sleeve; 705, moving plate two; 706, locking box; 707, screw; 708, thermal expansion spring; 709, limit groove; 710, trigger switch; 711, signal light; 8, cable sealing structure; 801, travel plate; 802, baffle; 803, sealing ring; 804, travel groove; 805, travel column; 9, replacement slot; 10, opening and closing cover. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0023] Please refer to Figures 1-7 An embodiment of the present application is: a storage battery open circuit protection device, comprising a main shell 1, the side of the main shell 1 is provided with a display panel 2, the side of the main shell 1 is provided with a communication antenna 3, the side of the main shell 1 is provided with a line interface 4, the side of the main shell 1 is provided with a control button 5, the side of the main shell 1 is provided with a terminal locking mechanism 6, the inside of the main shell 1 is provided with an overload alarm device 7, and the side of the main shell 1 is provided with a cable sealing structure 8.

[0024] The terminal locking mechanism 6 comprises a transmission cavity 601 which is arranged on the side of the main shell 1, the inner wall of the transmission cavity 601 is penetrated and rotationally connected with a first transmission shaft 602, the circumferential surface of the first transmission shaft 602 is fixedly connected with a worm 603, the bottom of the transmission cavity 601 is penetrated and rotationally connected with a threaded rod 604, the circumferential surface of the threaded rod 604 is threadedly connected with a first threaded sleeve 605, the circumferential surface of the first threaded sleeve 605 is fixedly connected with a moving plate 606, the bottom of the moving plate 606 is fixedly connected with a jacking post 607, the end of the jacking post 607 away from the moving plate 606 is fixedly connected with a pressing plate 608, the inner bottom of the main shell 1 is fixedly connected with a wiring board 609, the bottom of the pressing plate 608 is fixedly connected with a pointed needle 610, the top of the wiring board 609 is fixedly connected with a clamping plate 611, the inside of the main shell 1 is provided with a sliding limiting cavity 612, one end of the threaded rod 604 is fixedly connected with a worm wheel 613, one end of the first transmission shaft 602 is fixedly connected with a locking head 614.

[0025] The pointed needles 610 and the clamping plates 611 are provided in plurality, the side surface of the clamping plate 611 is located on the displacement track of the circumferential surface of the pointed needle 610, so that the pointed needle 610 can be closely embedded between the clamping plates 611, the stable locking of the terminal is realized, the cable head is effectively prevented from loosening or falling off, and the open circuit problem caused by poor contact is avoided.

[0026] The jacking posts 607 are provided in two groups and are mutually symmetrical along the vertical central axis of the threaded rod 604, the side surface of the pressing plate 608 is slidingly connected with the inner wall of the sliding limiting cavity 612, so that the pressing plate 608 can be kept stable during the moving process and will not be deviated, and it is ensured that the pointed needle 610 can be accurately embedded between the clamping plates 611, and the reliability of the locking of the cable head is improved.

[0027] The worm 603 and the worm wheel 613 are mutually engaged, the transmission cavity 601 is located above the sliding limiting cavity 612, and the circumferential surface of the threaded rod 604 is penetrated and rotationally connected with the bottom of the transmission cavity 601, so that the accurate adjustment of the position of the pressing plate 608 is realized, and it is ensured that the locking force of the terminal is moderate and the cable head will not be damaged due to over-tight locking.

[0028] In use, the operator first installs the device in a suitable position, then connects the cable of the battery to the device through the line interface 4, and then sets up the device by using the control button 5. When the cable head of the battery needs to be locked, first place the cable head on the corresponding position of the wiring board 609, ensure that the cable head is aligned with the clamping plate 611, and then insert the operating tool into the rotating locking head 614 to drive the first transmission shaft 602 to rotate. Since the first transmission shaft 602 is fixedly connected with the worm 603, and the worm 603 is meshed with the worm gear 613, the rotation of the worm 603 will drive the worm gear 613 to rotate. The worm gear 613 is fixed at one end of the threaded rod one 604, so the rotation of the worm gear 613 will drive the threaded rod one 604 to rotate. The circumference of the threaded rod one 604 is screw-connected with the first threaded sleeve 605, and the circumference of the first threaded sleeve 605 is fixedly connected with the moving plate one 606. Therefore, the rotation of the threaded rod one 604 will drive the moving plate one 606 to move downward. The bottom of the moving plate one 606 is fixedly connected with the jacks 607, and the jacks 607 are fixedly connected with the pressing plate 608 away from the moving plate one 606. Therefore, the downward movement of the moving plate one 606 will drive the pressing plate 608 to move downward. The bottom of the pressing plate 608 is fixedly connected with a plurality of sharp points 610, the top of the wiring board 609 is fixedly connected with a plurality of clamping plates 611, and the side surface of the clamping plate 611 is located on the displacement track of the circumference of the sharp point 610. Therefore, when the pressing plate 608 moves downward, the sharp points 610 will be tightly embedded between the clamping plates 611, so that the cable is clamped in the middle, and the stable locking of the cable head is realized.

[0029] Please refer to Figures 1-7 On the basis of the above embodiment, in another embodiment of the present application, the overload alarm device 7 comprises an overload protection cavity 701 which is opened in the inside of the main machine shell 1. The top of the wiring board 609 is fixedly connected with a conductive cable 702. The end of the first transmission shaft 602 away from the locking head 614 is fixedly connected with a second threaded rod 703. The circumference of the second threaded rod 703 is screw-connected with a second threaded sleeve 704. The circumference of the second threaded sleeve 704 is fixedly connected with a moving plate two 705. The side surface of the moving plate two 705 is fixedly connected with a locking box 706. The top of the locking box 706 is fixedly connected with a screw 707. The inside of the locking box 706 is provided with a thermal expansion spring 708. The top of the wiring board 609 is fixedly connected with a limiting groove 709. The top of the overload protection cavity 701 is provided with a trigger switch 710. The top of the main machine shell 1 is provided with a signal lamp 711. This is conducive to reminding the user which circuit has overload and problems, so that the user can take timely measures to handle, avoid damage to the battery or other electrical equipment due to overload, and effectively protect the safety and stability of the entire power system.

[0030] The top of the main shell 1 is provided with a replacement slot 9, and the inner wall of the replacement slot 9 is hinged with an opening and closing cover 10, which facilitates the user to replace and maintain the internal elements such as the thermal expansion spring 708, without disassembling the entire device, greatly improving the maintenance efficiency and reducing the maintenance cost.

[0031] The trigger end of the trigger switch 710 is located on the displacement track at the top of the thermal expansion spring 708, and the trigger switch 710 is electrically connected with the signal lamp 711, which facilitates the intuitive reminding of the user that there is an overload problem in the circuit.

[0032] The replacement slot 9 is located above the thermal expansion spring 708, and the side surface of the thermal expansion spring 708 is slidingly connected with the inner wall of the limiting slot 709, which facilitates the stable movement of the thermal expansion spring 708 along the limiting slot 709 when it is heated and expanded, ensuring that the trigger switch 710 can accurately sense the displacement change, and then timely trigger the signal lamp 711 to alarm.

[0033] The cable sealing structure 8 includes a stroke plate 801 fixedly connected to the side surface of the main shell 1, the inner wall of the stroke plate 801 is slidingly connected with a baffle 802, the side surface of the baffle 802 is fixedly connected with a sealing ring 803, the side surface of the baffle 802 is provided with a stroke slot 804, and the side surface of the lower pressing plate 608 is fixedly connected with a stroke column 805, which facilitates the tight fitting of the sealing ring 803 with the cable, effectively preventing foreign matters such as dust and moisture from entering the inside of the main shell, avoiding the problems of circuit short circuit or component damage caused by the invasion of foreign matters, and improving the reliability and service life of the device.

[0034] The circumferential surface of the stroke column 805 is slidingly connected with the inner wall of the stroke slot 804, the number of baffles 802 is two, and the side surface of the baffle 802 is located on the displacement track of the side surface of the other baffle 802, and the circumferential surface of the stroke column 805 penetrates and slidingly connects with the side surface of the main shell 1, which facilitates the prevention of adverse effects of external environmental factors on the internal circuit of the device.

[0035] When the first transmission shaft 602 rotates, the second threaded rod 703 is driven to rotate. Since the circumferential surface of the second threaded rod 703 is threadedly connected with the second threaded sleeve 704, and the circumferential surface of the second threaded sleeve 704 is fixedly connected with the moving plate two 705, the rotation of the second threaded rod 703 drives the moving plate two 705 to move along the limiting groove 709. The side surface of the moving plate two 705 is fixedly connected with the locking box 706, and the locking box 706 is internally provided with the thermal expansion spring 708. When the circuit is overloaded, the heat generated by the S-shaped conductive cable 702 causes the thermal expansion spring 708 to expand. Since the top of the thermal expansion spring 708 is located on the trigger end displacement track of the trigger switch 710, the thermal expansion spring 708 triggers the trigger switch 710. The trigger switch 710 is electrically connected with the signal lamp 711. After the trigger switch 710 is triggered, the signal lamp 711 is turned on, reminding the user that the circuit is overloaded and the remote monitoring terminal also receives the overload alarm information, and the circuit is disconnected for protection. When the thermal expansion spring 708 needs to be replaced, the user only needs to open the opening and closing cover 10, take out the damaged thermal expansion spring 708 through the replacement groove 9, and then install a new thermal expansion spring 708. The replacement process is simple and fast. When the cable head is clamped, the lower pressing plate 608 drives the stroke column 805 to move downward synchronously. Since the circumferential surface of the stroke column 805 is slidably connected with the inner wall of the stroke groove 804, and the side surface of the baffle 802 is located on the displacement track of the other baffle 802, the downward movement of the stroke column 805 drives the two baffles 802 to move close to each other. During the movement of the baffle 802, the sealing ring 803 fixedly connected with the side surface of the baffle 802 gradually tightly fits the cable, tightly seals the gap between the cable and the main machine shell 1, and effectively prevents impurities such as dust and water from entering the inside of the main machine shell 1. When the cable head is tightly embedded in the clamping plate 611 by the sharp pointed end 610 to achieve stable locking, the sealing ring 803 has completed the sealing of the cable, thereby avoiding the problems of circuit short circuit or component damage caused by impurities, and improving the reliability and service life of the device.

[0036] The above merely illustrates the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered by the protection scope of the present application.

Claims

1. A battery open-circuit protection device, comprising a main housing (1), characterized in that: The main unit housing (1) has a display panel (2) on its side, a communication antenna (3) on its side, a line interface (4) on its side, a control button (5) on its side, a terminal locking mechanism (6) on its side, an overload alarm device (7) inside its interior, and a cable sealing structure (8) on its side. The terminal locking mechanism (6) includes a transmission cavity (601), which is located on the side of the main housing (1). A first transmission shaft (602) is rotatably connected through the inner wall of the transmission cavity (601). A worm gear (603) is fixedly connected to the circumferential surface of the first transmission shaft (602). A threaded rod (604) is rotatably connected through the bottom of the transmission cavity (601). A first threaded sleeve (605) is threadedly connected to the circumferential surface of the threaded rod (604). A moving plate (606) is fixedly connected to the circumferential surface of the first threaded sleeve (605). The bottom of the moving plate (606) is... A top post (607) is fixedly connected to the main body housing (1). A lower pressure plate (608) is fixedly connected to the end of the top post (607) away from the moving plate (606). A wiring plate (609) is fixedly connected to the bottom of the inner side of the main body housing (1). A spike (610) is fixedly connected to the bottom of the lower pressure plate (608). A clamping plate (611) is fixedly connected to the top of the wiring plate (609). A sliding limiting cavity (612) is opened inside the main body housing (1). A worm gear (613) is fixedly connected to one end of the threaded rod (604). A locking head (614) is fixedly connected to one end of the first drive shaft (602).

2. The battery open-circuit protection device according to claim 1, characterized in that: The number of spikes (610) and clamps (611) is set to several, and the side of the clamp (611) is located on the displacement trajectory of the circumferential surface of the spike (610).

3. The battery open-circuit protection device according to claim 2, characterized in that: There are two sets of top posts (607), and the two sets of top posts (607) are symmetrical to each other along the vertical central axis of the threaded rod (604). The side of the lower pressure plate (608) is slidably connected to the inner wall of the sliding limiting cavity (612).

4. A battery open-circuit protection device according to claim 3, characterized in that: The worm (603) meshes with the worm wheel (613), the transmission cavity (601) is located above the sliding limiting cavity (612), and the circumferential surface of the threaded rod (604) penetrates and is rotatably connected to the bottom of the transmission cavity (601).

5. A battery open-circuit protection device according to claim 4, characterized in that: The overload alarm device (7) includes an overload protection cavity (701), which is located inside the main housing (1). A conductive cable (702) is fixedly connected to the top of the terminal block (609). A second threaded rod (703) is fixedly connected to one end of the first drive shaft (602) away from the locking head (614). A second threaded sleeve (704) is threadedly connected to the circumferential surface of the second threaded rod (703). The circumferential surface of the second threaded sleeve (704) is fixedly connected to... A movable plate two (705) is connected, and a locking box (706) is fixedly connected to the side of the movable plate two (705). A screw (707) is fixedly connected to the top of the locking box (706). A thermal expansion spring (708) is provided inside the locking box (706). A limit groove (709) is fixedly connected to the top of the wiring plate (609). A trigger switch (710) is provided on the top of the overload protection cavity (701). An indicator light (711) is provided on the top of the main unit housing (1).

6. A battery open-circuit protection device according to claim 5, characterized in that: The top of the main housing (1) is provided with a replacement slot (9), and the inner wall of the replacement slot (9) is hinged with an opening and closing cover (10).

7. A battery open-circuit protection device according to claim 6, characterized in that: The trigger end of the trigger switch (710) is located on the displacement trajectory of the top of the thermal expansion spring (708), and the trigger switch (710) is electrically connected to the signal lamp (711).

8. A battery open-circuit protection device according to claim 7, characterized in that: The replacement groove (9) is located above the thermal expansion spring (708), and the side of the thermal expansion spring (708) is slidably connected to the inner wall of the limiting groove (709).

9. A battery open-circuit protection device according to claim 8, characterized in that: The cable sealing structure (8) includes a travel plate (801), which is fixedly connected to the side of the main housing (1). A baffle (802) is slidably connected to the inner wall of the travel plate (801). A sealing ring (803) is fixedly connected to the side of the baffle (802). A travel groove (804) is opened on the side of the baffle (802). A travel column (805) is fixedly connected to the side of the lower pressure plate (608).

10. A battery open-circuit protection device according to claim 9, characterized in that: The circumferential surface of the stroke column (805) is slidably connected to the inner wall of the stroke groove (804). There are two baffles (802), and the side of the baffle (802) is located on the displacement trajectory of the side of the other baffle (802). The circumferential surface of the stroke column (805) is penetrating and slidably connected to the side of the main housing (1).

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