A lithium battery with self-protection function and a protection operation method

Abstract

This invention relates to the field of lithium battery technology, specifically to a lithium battery with self-protection function and a protection operation method. Each mounting slot has a top plate, which is elastically connected to the bottom of a top cover. In the initial state, the latching assembly is engaged in the vertical slot, and the electrode head abuts against the electrode end of the battery cell. A temperature sensing element continuously monitors the temperature of the battery cell. When the temperature exceeds a preset value, a pop-out component is triggered to push against the latching assembly, causing the latching assembly to disengage from the vertical slot. The top plate then springs upward under the action of a first elastic element, moving the electrode head upward and disengaging it from the electrode end of the battery cell. By controlling the pull-back component to pull down, a stop block abuts against the pulled-down top plate, causing the latching assembly to re-engage in the vertical slot. If the pop-out component pushes against the latching assembly again and triggers a lateral movement of the movable hole, the stop block slides along the movable hole to below the top plate, thus completely losing control of the top plate. This enables immediate confirmation of abnormalities and elimination of potential hazards.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to a lithium battery with self-protection function and a method for protecting its operation. Background Technology

[0002] Lithium-ion batteries are typically integrated from multiple battery modules. During charging and discharging, individual cells may malfunction, such as overheating. Existing technologies, such as the lithium battery assembly with self-protection function disclosed in Chinese patent document CN209658352U, include a casing and a lithium battery. The lithium battery is located inside the casing, and an insulation layer is provided on the inner wall of the casing. A temperature controller is located on the side of the casing, and a cooling device is located on the top of the casing. A temperature fuse is installed in the wiring connection between the individual lithium batteries. By rapidly cooling compressed air, the cold air is released through pipes inside the casing, achieving a rapid cooling effect. Furthermore, the temperature fuse in the lithium battery wiring connection prevents damage to individual lithium batteries due to overheating. However, the individual... A single temperature anomaly could be due to a mismeasurement or an occasional abnormality in the battery cell, and is not sufficient to determine that the cell is damaged or failed. Chinese patent document CN106208218A discloses a lithium battery charge-discharge balancing device, which includes a charging current detection terminal, an overcurrent protection terminal, an overtemperature protection terminal, and an overvoltage protection terminal installed on the charging end. The system has over-temperature, overvoltage, and overcurrent protection functions for charging and discharging. When the charging and discharging temperature exceeds 45 degrees Celsius, it automatically cuts off the circuit to protect the battery. However, if a single battery cell is indeed abnormal, the process of repeatedly detecting overtemperature and then powering off and restarting is not only dangerous, but also wastes energy and is not conducive to timely elimination of hidden dangers and timely repair. Summary of the Invention

[0003] In view of this, the purpose of this invention is to propose a lithium battery with self-protection function and a protection operation method to solve the problem that the cell cannot be identified and the potential dangers eliminated in a timely manner.

[0004] To achieve the above objectives, the present invention provides a lithium battery with a self-protection function, comprising a battery casing, a top cover at the top of the battery casing, and a plurality of mounting slots for inserting battery cells arranged inside the battery casing, and further comprising:

[0005] A top plate is located above each mounting slot. The top plate is elastically connected to the bottom of the top cover. An electrode post is connected to the bottom of the top plate. An electrode head is connected to the electrode post. Connecting posts are connected to both sides of the bottom of the top plate. A snap-fit ​​assembly is connected to the bottom of the connecting post.

[0006] The vertical groove is formed inside the side wall of the mounting groove. In the initial state, the snap-fit ​​assembly is snapped into the vertical groove, and the electrode head abuts against the electrode end of the battery cell.

[0007] The temperature sensing part is used to sense the temperature of the battery cell. A pop-out component is provided on the side of the vertical slot. When the temperature sensing part exceeds the preset value, it triggers the pop-out component to push against the latching component, so that the latching component is disengaged from the vertical slot, the top plate and the electrode head move upward and disengage from the battery cell's electrode terminals.

[0008] The pull-back assembly is located inside the battery casing. The top of the pull-back assembly extends through the top plate and is connected to a stop block. The top plate has a movable hole. When the pop-out assembly pushes against the buckle assembly, the movable hole moves laterally toward the stop block. When the top plate moves up, the pull-back assembly pulls down the top plate so that the buckle assembly is re-engaged in the vertical groove. If the pop-out assembly pushes against the buckle assembly again and triggers the movable hole to move laterally, the stop block slides along the movable hole to below the top plate.

[0009] Preferably, the top end of the top plate is connected to the bottom end of the top cover via a first elastic element.

[0010] Preferably, the buckle assembly includes a rotating plate rotatably connected to the bottom end of the connecting post, and a second elastic element is connected between the rotating plate and the connecting post. In the initial state, the second elastic element pushes the rotating plate to rotate outward.

[0011] Preferably, a support platform is provided at the top of the vertical groove, and a third elastic element is connected to the side end of the support platform. When the connecting column is inserted into the vertical groove, the rotating plate pushes the support platform laterally to compress the third elastic element laterally until the rotating plate moves to the lower end of the support platform. The third elastic element pushes the support platform to move laterally and reset, and the top of the rotating plate abuts against the bottom end of the support platform.

[0012] That is, the rotating plate will not rotate or close during the process of being inserted into the vertical groove.

[0013] Preferably, the temperature sensing part is a temperature sensing bulb, which is filled with a temperature sensing medium. The temperature sensing bulb is connected to a medium pipe, one end of which is connected to a valve chamber. A spring is provided in the valve chamber, and the ejection component is a push rod. One end of the push rod passes through the valve chamber and is fixedly connected to the spring. When the temperature sensing bulb detects a temperature exceeding a preset value, it pushes the spring through the temperature sensing medium, causing the push rod to eject and push the rotating plate to rotate inward.

[0014] Preferably, the pull-back assembly is a telescopic rod, which is vertically arranged on both sides of the top of the mounting groove. The abutment is fixedly connected to the top of the movable end of the telescopic rod. A magnetic suction part is connected to the top cover. A horizontal column is slidably arranged inside the top plate. The movable hole is opened on the horizontal column. A connecting rope is connected to one end of the horizontal column, and a fourth elastic element is connected between the other end and the top plate. One end of the connecting rope is connected to the rotating connection between the rotating plate and the connecting column. In the initial state, the top of the movable end of the telescopic rod passes through the movable hole, and the abutment is attracted to the magnetic suction part. When the pop-out assembly pushes the rotating plate to rotate and retract, the top plate moves up. By controlling the telescopic rod to retract, the abutment moves away from the magnetic suction part and abuts against the horizontal column, driving the top plate to move down so that the rotating plate is re-locked in the vertical groove. If the pop-out assembly pushes the rotating plate again, the transmission connecting rope is loosened, so that the fourth elastic element pulls the horizontal column to move laterally inward. At the same time, the movable hole moves laterally inward so that the abutment slides along the movable hole to the bottom of the top plate.

[0015] Preferably, a rotating shaft is connected to the bottom end of the rotating plate, the rotating shaft is rotatably connected to the connecting column, the connecting rope is wound around the rotating shaft, a guide wheel is rotatably connected inside the top plate, the connecting rope is guided by the guide wheel and connected to one end of the horizontal column.

[0016] Preferably, a movable plate is provided on the top cover above each mounting slot, and a latch is connected between the movable plate and the top cover. By opening the latch, the movable plate can be removed or pressed down. An observation window is provided on the movable plate.

[0017] Preferably, a rotating column is fixedly connected to the top of the magnetic suction part. The rotating column is rotatably connected inside the movable plate. By rotating the rotating column, the adsorbed block is turned so that the block passes through the movable hole.

[0018] The present invention also provides a method for protecting the operation of a lithium battery with self-protection function, comprising the following steps:

[0019] In the initial state, the battery cells are inserted into the mounting slots and positioned. Pressing the top cover causes the snap-fit ​​components to engage in the vertical slots. The electrode heads are connected to the battery cell terminals. The top of the movable end of the telescopic rod passes through the movable hole, and the abutment is attracted to the magnetic suction part. When an individual battery cell is initially detected to be overheated, the pop-out component pushes the rotating plate to rotate and retract, causing the top plate to move upward. By controlling the telescopic rod to retract, the abutment moves away from the magnetic suction part and abuts against the horizontal column, causing the top plate to move downward so that the rotating plate is re-engaged in the vertical slot. If the pop-out component pushes the rotating plate again, the transmission connecting rope is loosened, causing the fourth elastic element to pull the horizontal column to move laterally inward. At the same time, the movable hole moves laterally inward, causing the abutment to slide along the movable hole to the bottom of the top plate, losing control of the top plate.

[0020] To perform maintenance on the battery casing, first observe the internal condition through the viewing window. If no abnormality is found, open the latch, remove the movable plate, and replace the corresponding battery cell. If no obvious abnormality is found, there is no need to open the casing to replace the battery cell. Press down on the movable plate to compress the first elastic element, so that the magnetic suction part is close to the top plate. By rotating the rotating column, the attracted block is rotated so that it passes through the movable hole. Then, release the movable plate to move it up, and the block moves up with the magnetic suction part. Then, rotate the magnetic suction part back to reset the block so that it returns to its initial position.

[0021] The beneficial effects of this invention are as follows: Each mounting slot has a top plate, which is elastically connected to the bottom of the top cover. In the initial state, the latching assembly is engaged in the vertical slot, and the electrode head abuts against the electrode end of the battery cell. The temperature of the battery cell is sensed in real time by a temperature sensing element. When the temperature sensed by the temperature sensing element exceeds a preset value, a pop-out component is triggered to push the latching assembly, causing the latching assembly to disengage from the vertical slot. The top plate rebounds upward under the action of the first elastic element, causing the electrode head to move upward and disengage from the electrode end of the battery cell. By controlling the pull-back component to pull down, the stop block abuts against the pulled-down top plate, causing the latching assembly to re-engage. If the pop-out component pushes against the latch component again within the vertical slot, triggering the lateral movement of the movable hole, the abutment will slide along the movable hole to below the top plate, thus completely losing contact with the top plate. In other words, the pull-back component cannot move the top plate regardless of whether it pops up or pulls down, and the cell cannot connect to the electrode head to restart. The only way to complete the repair is for maintenance personnel to manually reset the position of the abutment when maintaining the cell inside the battery casing. This prevents the cell connection from being completely disconnected during the first over-temperature test, and also prevents repeated over-temperature checks and restarts after repeated over-temperature checks, thus enabling the immediate confirmation of abnormalities and elimination of potential hazards. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the mounting groove and top plate of the present invention;

[0025] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 This is a schematic diagram of the structure of the abutment and the third elastic element of the present invention;

[0027] Figure 5 This is a schematic diagram of the structure of the pop-out component of the present invention when it first pushes against the rotating plate and retracts.

[0028] Figure 6 This is a schematic diagram of the structure when the top plate of the present invention moves upward;

[0029] Figure 7 This is a schematic diagram of the structure of the telescopic rod of the present invention when it retracts;

[0030] Figure 8 This is a schematic diagram of the structure of the telescopic rod of the present invention driving the buckle assembly to engage in the vertical groove;

[0031] Figure 9 This is a schematic diagram of the structure of the pop-out component of the present invention when it pushes against the rotating plate again to rotate and retract;

[0032] Figure 10 This is a schematic diagram of the structure of the top plate of the present invention when it detaches from the abutment block and moves upward;

[0033] Figure 11 This is a schematic diagram of the structure of the present invention when the movable plate is pressed down;

[0034] Figure 12 This is a schematic diagram of the rotating column of the present invention.

[0035] Figure 13 This is a schematic diagram of the structure of the present invention when the rotating column drives the adsorbed block to move upward;

[0036] Figure 14 This is a schematic diagram of the structure of the rotating column during its rotation and reset according to the present invention;

[0037] Figure 15 This is a top view of the movable plate of the present invention.

[0038] The diagram is marked as follows:

[0039] 1. Battery casing; 2. Top cover; 210. Locking bolt; 3. Battery cell; 4. Mounting slot; 41. Vertical slot; 5. Top plate; 6. Electrode post; 61. Electrode head; 7. Connecting post; 8. First elastic element; 9. Rotating plate; 91. Rotating shaft; 10. Second elastic element; 11. Support platform; 12. Third elastic element; 13. Temperature sensing bulb; 14. Medium pipeline; 15. Valve chamber; 16. Spring; 17. Top rod; 18. Telescopic rod; 19. Support block; 20. Magnetic suction part; 21. Horizontal column; 22. Movable hole; 23. Connecting rope; 24. Fourth elastic element; 25. Guide wheel; 26. Movable plate; 27. Lock; 28. Observation window; 29. ​​Rotating post; 30. Indicator light. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0041] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a lithium battery with self-protection function includes a battery casing 1, a top cover 2 at the top of the battery casing 1, and a plurality of mounting slots 4 for inserting battery cells 3 arranged inside the battery casing 1. A top plate 5 is provided above each mounting slot 4, and the top plate 5 is elastically connected to the bottom of the top cover 2. An electrode post 6 is connected to the bottom of the top plate 5, and an electrode head 61 is connected to the electrode post 6. Connecting posts 7 are connected to both sides of the bottom of the top plate 5, and a snap-fit ​​assembly is connected to the bottom of the connecting posts 7. A vertical groove 41 is formed in the side wall of the mounting slot 4. In the initial state, the snap-fit ​​assembly is snapped into the vertical groove 41, and the electrode head 61 abuts against the electrode terminals of the battery cell 3. A temperature sensing part is provided to sense the temperature of the battery cell 3. A pop-out assembly is provided on the side of the vertical groove 41. When the temperature sensing part detects that the temperature exceeds the preset value, it triggers the pop-out component to push the latching component, so that the latching component is disengaged from the vertical groove 41. The top plate 5 and the electrode head 61 move upward and disengage from the electrode terminals of the battery cell 3. The battery casing 1 is provided with a pull-back component. The top of the pull-back component extends through the top plate 5 and is connected to a stop block 19. The top plate 5 is provided with a movable hole 22. When the pop-out component pushes the latching component, the movable hole 22 moves laterally toward the stop block 19. When the top plate 5 moves upward, the pull-back component pulls the top plate 5 down so that the latching component is re-engaged in the vertical groove 41. If the pop-out component pushes the latching component again and triggers the movable hole 22 to move laterally, the stop block 19 slides along the movable hole 22 to below the top plate 5.

[0043] This invention is based on an existing lithium battery and includes a battery casing 1. A top cover 2 is provided at the top of the battery casing 1, and the top cover 2 is locked to the battery casing 1 by a locking bolt 210. Several mounting slots 4 for inserting battery cells 3 are arranged inside the battery casing 1. Specifically, a top plate 5 is provided above each mounting slot 4, and the top plate 5 is elastically connected to the bottom end of the top cover 2. Specifically, the top end of the top plate 5 is connected to the bottom end of the top cover 2 by a first elastic element 8. An electrode post 6 is connected to the bottom end of the top plate 5, and an electrode head 61 is connected to the electrode post 6. Connecting posts 7 are connected to both sides of the bottom end of the top plate 5, and the bottom ends of the connecting posts 7 are connected to… A snap-fit ​​assembly is attached, and a vertical groove 41 is formed in the side wall of the mounting slot 4. In the initial state, the snap-fit ​​assembly is snapped into the vertical groove 41, and the electrode head 61 abuts against the electrode end of the battery cell 3. That is, the snap-fit ​​assembly securely fixes the battery cell and connects the electrode head 61 and the battery cell 3 for charging and discharging. The temperature of the battery cell 3 is sensed in real time by a temperature sensing element. When the temperature sensed by the temperature sensing element exceeds a preset value, a pop-out assembly is triggered to push the snap-fit ​​assembly, causing the snap-fit ​​assembly to disengage from the vertical groove 41. Under the action of the first elastic member 8, the top plate 5 springs back upward, driving the electrode head 61 to move upward and disengage. The battery cell 3 has its terminals, and the battery casing 1 has a pull-back assembly. The top of the pull-back assembly extends through the top plate 5 and is connected to a stop block 19. The top plate 5 has a movable hole 22. When the pop-out assembly pushes against the latching assembly, the movable hole 22 moves laterally toward the stop block 19. Thus, when the top plate 5 moves upward for the first time, the movable hole 22 moves laterally until the latching assembly moves out of the vertical groove 41. The movable hole 22 then moves laterally in the opposite direction to reset. By controlling the pull-back assembly to pull down, the stop block 19 abuts against the pulled-down top plate 5, so that the latching assembly is re-locked into the vertical groove 41. If the pop-out assembly pushes against the latching assembly again... This triggers the horizontal movement of the movable hole 22, causing the abutment 19 to slide along the movable hole 22 to below the top plate 5, thus completely losing its connection with the top plate 5. In other words, the pull-back assembly cannot move the top plate 5 regardless of whether it is pulled up or down, and the battery cell 3 cannot be connected to the electrode head 61 to restart. The only way to complete the repair is for maintenance personnel to manually reset the position of the abutment 19 when maintaining the battery cell 3 inside the battery casing 1. This way, the battery cell 3 will not be completely disconnected during the first over-temperature test, nor will it be repeatedly tested for over-temperature and restarted after repeated confirmation of over-temperature. This achieves the function of immediately confirming abnormalities and eliminating potential hazards.

[0044] In embodiments of the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the buckle assembly includes a rotating plate 9 rotatably connected to the bottom end of the connecting post 7. A second elastic member 10 is connected between the rotating plate 9 and the connecting post 7. In the initial state, the second elastic member 10 pushes the rotating plate 9 to rotate outward, and the rotating plate 9 is in an unfolded state.

[0045] In embodiments of the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a platform 11 is provided at the top of the vertical groove 41. A third elastic element 12 is connected to the side end of the platform 11. When the connecting column 7 is inserted into the vertical groove 41, the rotating plate 9 pushes the platform 11 laterally to compress the third elastic element 12 laterally until the rotating plate 9 moves to the lower end of the platform 11. The third elastic element 12 pushes the platform 11 to move laterally and reset. The top of the rotating plate 9 abuts against the bottom end of the platform 11. That is, the rotating plate 9 will not rotate and retract during the process of being inserted into the vertical groove 41.

[0046] The temperature sensing element can be an existing temperature sensor, and the pop-out component can be an existing electric telescopic rod component. When the temperature sensor detects that the temperature of the battery cell 3 exceeds a preset value, the pop-out component is triggered to pop out, pushing the rotating plate to rotate inward and retract. This is one embodiment of the invention. Figure 4 As shown, the temperature sensing part is a temperature sensing bulb 13, which is located on the side of the battery cell 3. The temperature sensing bulb 13 is filled with a temperature sensing medium. The temperature sensing bulb 13 is connected to a medium pipe 14. One end of the medium pipe 14 is connected to a valve chamber 15. A spring 16 is provided in the valve chamber 15. The ejection component is a push rod 17. One end of the push rod 17 is inserted into the valve chamber 15 and fixedly connected to the spring 16. When the temperature sensing bulb 13 senses a temperature exceeding a preset value, the liquid or gaseous temperature sensing medium inside it expands or vaporizes due to heat, thereby pushing the spring 16 and causing the push rod 17 to eject. This pushes the rotating plate 9 to rotate inward and retract until it passes over the platform 11 and exits the vertical groove 41. Preferably, the top of the rotating plate 9 can be made of a flexible material to facilitate rotation over the platform 11.

[0047] In embodiments of the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the pull-back assembly is a telescopic rod 18, which is vertically arranged on both sides of the top of the mounting groove 4. The abutment 19 is fixedly connected to the top of the movable end of the telescopic rod 18. A magnetic suction part 20 is connected to the top cover 2. The magnetic suction part 20 can be made of existing permanent magnet material. A horizontal column 21 is slidably provided in the top plate 5. The movable hole 22 is opened on the horizontal column 21. A connecting rope 23 is connected to one end of the horizontal column 21, and a fourth elastic element 24 is connected between the other end and the top plate 5. One end of the connecting rope 23 is connected to the rotating connection between the rotating plate 9 and the connecting column 7. Specifically, a rotating shaft 91 is connected to the bottom end of the rotating plate 9. The rotating shaft 91 is rotatably connected to the connecting column 7. The connecting rope 23 is wound around the rotating shaft 91. A guide wheel 25 is rotatably connected in the top plate 5. The connecting rope 23 is guided by the guide wheel 25 and connected to one end of the horizontal column 21.

[0048] like Figures 1 to 10As shown, in the initial state, each battery cell 3 is inserted into its respective mounting slot 4. The top cover 2 is pressed down to engage the snap-fit ​​components in the vertical slot 41. The electrode head 61 is connected to the electrode terminals of the battery cell 3 for charging and discharging. The battery casing 1 can be insulated using common methods such as liquid cooling or air cooling. The top of the movable end of the telescopic rod 18 passes through the movable hole 22, and the abutment 19 is attracted to the magnetic suction part 20. When an individual battery cell 3 is initially detected to be overheated, the pop-out component pushes the rotating plate 9 to rotate and retract, and the top plate 5 moves upward. Since the abutment 19 is attracted to the magnetic suction part 20, it does not affect the abutment 19 or the telescopic rod 18. After a predetermined time (when the battery cell 3 is reheated), the telescopic rod 18 is controlled to retract, the abutment 19 moves away from the magnetic suction part 20 and abuts against the horizontal column 21, causing the top plate 5 to move downward so that the rotating plate 9 is re-engaged. If the ejector component pushes against the rotating plate 9 again within the vertical groove 41, the transmission connecting rope 23 will loosen, causing the fourth elastic element 24 to pull the horizontal column 21 to move laterally inward. At the same time, the movable hole 22 will move laterally inward, causing the abutment block 19 to slide along the movable hole 22 to below the top plate 5. As the rotating plate 9 moves out of the vertical groove 41, it will immediately rotate and unfold to reset. That is, the horizontal column 21 and the movable hole 22 will move laterally to reset under the action of the fourth elastic element 24. As a result, the abutment block 19 will be blocked from moving upward by the horizontal column 21, and it will also be unable to move downward by driving the top plate 5. Therefore, the main body of the lithium battery cannot remotely control the abnormal cell 3 to restart the connection, avoiding the safety hazards caused by repeated connection. Only when entering the battery casing 1 for maintenance can the status of the cell 3 be checked, and replacement and repair can be selected, or the position of the abutment block 19 can be manually reset after checking and confirming that there are no problems, so as to completely eliminate the hidden danger.

[0049] As one embodiment of the present invention, such as Figures 10 to 15 As shown, a movable plate 26 is provided on the top cover 2 above each mounting slot 4. A latch 27 is connected between the movable plate 26 and the top cover 2. The movable plate 26 can be removed or pressed down by opening the latch 27. The movable plate 26 is provided with an observation window 28. When entering the battery housing 1 for maintenance, the internal condition can be observed through the observation window 28. If no obvious abnormality is found, the position of the stop block 19 can be manually reset without opening to replace the battery cell 3. If the abnormality is not known, the latch 27 can be opened, the movable plate 26 can be removed, and the battery cell 3 in the corresponding position can be replaced. Preferably, the movable plate 26 can be provided with an indicator light 30. When the electrode head 61 is connected to the electrode terminal of the battery cell 3, the indicator light 30 is turned on, and the position of the disconnected abnormal battery cell 3 can be determined by the indicator light 30.

[0050] In embodiments of the present invention, such as Figures 10 to 15As shown, a rotating post 29 is fixedly connected to the top of the magnetic suction part 20. The rotating post 29 is rotatably connected to the movable plate 26. Preferably, a cross groove can be opened on the top of the rotating post 29 that protrudes from the movable plate 26 to facilitate the use of tools to rotate the rotating post 29. When it is determined through the observation window 28 that there is no obvious abnormality, or when the battery cell 3 has been replaced for maintenance, the movable plate 26 is pressed down to compress the first elastic element 8 so that the magnetic suction part 20 is close to the top plate 5. By rotating the rotating post 29, the attracted abutment block 19 is rotated so that the abutment block 19 passes through the movable hole 22. Then the movable plate 26 is released and moved upward, and the abutment block 19 moves upward with the magnetic suction part 20. Then the magnetic suction part 20 is rotated back to reset so that the abutment block 19 is rotated back to its initial position, which facilitates the normal use of the battery.

[0051] The present invention also provides a method for protecting the operation of a lithium battery with self-protection function, comprising the following steps:

[0052] In the initial state, the battery cell 3 is inserted into each mounting slot 4 and positioned. The top cover 2 is pressed so that each snap-fit ​​assembly is snapped into the vertical slot 41. The electrode head 61 is connected to the electrode end of the battery cell 3. The top of the movable end of the telescopic rod 18 passes through the movable hole 22. The abutment 19 is attracted to the magnetic suction part 20. When an individual battery cell 3 is initially detected to be overheated, the pop-out assembly pushes the rotating plate 9 to rotate and retract, and the top plate 5 moves upward. By controlling the telescopic rod 18 to retract, the abutment 19 moves away from the magnetic suction part 20 and abuts against the horizontal column 21, driving the top plate 5 to move downward so that the rotating plate 9 is snapped back into the vertical slot 41. If the pop-out assembly pushes the rotating plate 9 again, the transmission connecting rope 23 is released so that the fourth elastic element 24 pulls the horizontal column 21 to move laterally inward. At the same time, the movable hole 22 moves laterally inward so that the abutment 19 slides along the movable hole 22 to below the top plate 5 and loses control of the top plate 5.

[0053] To perform maintenance on the battery casing 1, first observe the internal condition through the viewing window 28. If no abnormality is found, open the latch 27, remove the movable plate 26, and replace the corresponding battery cell 3. If no obvious abnormality is found, there is no need to open and replace the battery cell 3. Press down on the movable plate 26 to compress the first elastic element 8 so that the magnetic suction part 20 is close to the top plate 5. Rotate the rotating column 29 to drive the attracted block 19 to turn so that the block 19 passes through the movable hole 22. Then release the movable plate 26 to move it upward, and the block 19 moves upward with the magnetic suction part 20. Then rotate the magnetic suction part 20 back to reset so that the block 19 turns back to its initial position.

[0054] During the initial assembly of the battery module, the entire top cover 2 is pressed to engage the various snap-fit ​​components in the vertical groove 41. Then, the top cover 2 is pulled up to the position of the locking bolt 210, which locks the top cover 2 and the battery housing 1. The locking bolt 210 is released and the top cover 2 is removed only when the entire module is replaced or maintained.

[0055] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0056] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A lithium battery with self-protection function, comprising a battery shell (1), a top cover (2) is arranged at the top end of the battery shell (1), a plurality of installation grooves (4) for inserting battery cells (3) are arranged in the battery shell (1), characterized in that, Also includes: A top plate (5) is provided above each of the mounting slots (4). The top plate (5) is elastically connected to the bottom end of the top cover (2). An electrode post (6) is connected to the bottom end of the top plate (5). An electrode head (61) is connected to the electrode post (6). Connecting posts (7) are connected to both sides of the bottom end of the top plate (5). A buckle assembly is connected to the bottom end of the connecting post (7). A vertical groove (41) is formed in the side wall of the mounting groove (4). In the initial state, the snap-fit ​​assembly is snapped into the vertical groove (41), and the electrode head (61) abuts against the electrode end of the battery cell (3). The temperature sensing part is used to sense the temperature of the battery cell (3). The side end of the vertical groove (41) is provided with a pop-out component. When the temperature sensed by the temperature sensing part exceeds the preset value, the pop-out component is triggered to push the buckle component so that the buckle component is disengaged from the vertical groove (41). The top plate (5) and the electrode head (61) move upward and disengage from the electrode end of the battery cell (3). A pull-back assembly is provided inside the battery housing (1). The top end of the pull-back assembly extends through the top plate (5) and is connected to a stop block (19). The top plate (5) is provided with a movable hole (22). When the pop-out assembly pushes against the buckle assembly, it drives the movable hole (22) to move laterally toward the stop block (19). When the top plate (5) moves up, the pull-back assembly pulls down the top plate (5) so that the buckle assembly is re-engaged in the vertical groove (41). If the pop-out assembly pushes against the buckle assembly again and triggers the movable hole (22) to move laterally, the stop block (19) slides along the movable hole (22) to below the top plate (5). The top end of the top plate (5) is connected to the bottom end of the top cover (2) by a first elastic element (8); The buckle assembly includes a rotating plate (9) rotatably connected to the bottom end of the connecting post (7). A second elastic element (10) is connected between the rotating plate (9) and the connecting post (7). In the initial state, the second elastic element (10) pushes the rotating plate (9) to rotate outward. The pull-back assembly is a telescopic rod (18), which is vertically arranged on both sides of the top of the mounting groove (4). The abutment (19) is fixedly connected to the top of the movable end of the telescopic rod (18). A magnetic suction part (20) is connected to the top cover (2). A horizontal column (21) is slidably arranged in the top plate (5). The movable hole (22) is opened on the horizontal column (21). A connecting rope (23) is connected to one end of the horizontal column (21), and a fourth elastic element (24) is connected between the other end and the top plate (5). One end of the connecting rope (23) is connected to the rotating connection between the rotating plate (9) and the connecting column (7). In the initial state, the top of the movable end of the telescopic rod (18) passes through the movable hole (22). When the abutment block (19) is attracted to the magnetic suction part (20), and the pop-out component pushes the rotating plate (9) to rotate and retract, the top plate (5) moves upward. By controlling the telescopic rod (18) to retract, the abutment block (19) moves away from the magnetic suction part (20) and abuts against the horizontal column (21), driving the top plate (5) to move downward so that the rotating plate (9) is re-engaged in the vertical groove (41). If the pop-out component pushes the rotating plate (9) again, the connecting rope (23) is loosened so that the fourth elastic element (24) pulls the horizontal column (21) to move laterally inward. At the same time, the movable hole (22) moves laterally inward so that the abutment block (19) slides along the movable hole (22) to below the top plate (5). The bottom end of the rotating plate (9) is connected to a rotating shaft (91), which is rotatably connected to the connecting column (7). The connecting rope (23) is wound around the rotating shaft (91). The top plate (5) is rotatably connected to a guide wheel (25). The connecting rope (23) is guided by the guide wheel (25) and connected to one end of the horizontal column (21).

2. The lithium battery with self-protection function according to claim 1, characterized in that, The top of the vertical groove (41) is provided with a platform (11), and a third elastic element (12) is connected to the side end of the platform (11). When the connecting column (7) is inserted into the vertical groove (41), the rotating plate (9) pushes the platform (11) laterally so that the third elastic element (12) is compressed laterally until the rotating plate (9) moves to the lower end of the platform (11). The third elastic element (12) pushes the platform (11) to move laterally and reset. The top of the rotating plate (9) abuts against the bottom end of the platform (11).

3. The lithium battery with self-protection function according to claim 1, characterized in that, The temperature sensing part is a temperature sensing bulb (13), which is filled with a temperature sensing medium. The temperature sensing bulb (13) is connected to a medium pipe (14), one end of which is connected to a valve chamber (15). A spring plate (16) is provided in the valve chamber (15). The ejection component is a push rod (17), one end of which is inserted into the valve chamber (15) and fixedly connected to the spring plate (16). When the temperature sensing bulb (13) exceeds a preset value, it pushes the spring plate (16) through the temperature sensing medium, thereby causing the push rod (17) to eject and push the rotating plate (9) to rotate inward.

4. The lithium battery with self-protection function according to claim 1, characterized in that, The top cover (2) is provided with a movable plate (26) above each of the mounting slots (4). The movable plate (26) is connected to the top cover (2) by a latch (27). By opening the latch (27), the movable plate (26) can be removed or pressed down. The movable plate (26) is provided with an observation window (28).

5. The lithium battery with self-protection function according to claim 4, characterized in that, The magnetic suction part (20) is fixedly connected to a rotating column (29) at its top end. The rotating column (29) is rotatably connected to the movable plate (26). By rotating the rotating column (29), the adsorbed abutment block (19) is turned so that the abutment block (19) passes through the movable hole (22).

6. A method for protecting and operating a lithium battery with self-protection function, based on the lithium battery with self-protection function according to claim 5, characterized in that, Includes the following steps: In the initial state, the battery cell (3) is inserted into each mounting slot (4) and positioned. The top cover (2) is pressed down so that each snap-fit ​​assembly is snapped into the vertical slot (41). The electrode head (61) is connected to the electrode end of the battery cell (3). The top of the movable end of the telescopic rod (18) passes through the movable hole (22). The abutment (19) is attracted to the magnetic suction part (20). When an individual battery cell (3) is initially detected to be overheated, the pop-out assembly pushes the rotating plate (9) to rotate and retract, the top plate (5) moves upward, and the telescopic rod (18) is retracted by controlling it. The abutment (19) moves away from the magnetic suction part (20) and abuts against the horizontal column (21), causing the top plate (5) to move down so that the rotating plate (9) is re-engaged in the vertical groove (41). If the pop-out component pushes against the rotating plate (9) again, the transmission connecting rope (23) is released so that the fourth elastic element (24) pulls the horizontal column (21) to move laterally inward, and at the same time the movable hole (22) moves laterally inward so that the abutment (19) slides along the movable hole (22) to the bottom of the top plate (5) and loses control of the top plate (5). When entering the battery casing (1) for maintenance, first observe the internal condition through the observation window (28). If it is uncertain whether there is any abnormality, open the latch (27), remove the movable plate (26), and replace the corresponding cell (3). If it is confirmed that there is no obvious abnormality, there is no need to open and replace the cell (3). By pressing down the movable plate (26), the first elastic element (8) is compressed so that the magnetic suction part (20) is close to the top plate (5). By rotating the rotating column (29), the adsorbed block (19) is turned so that the block (19) passes through the movable hole (22). Then, the movable plate (26) is released and moved upward. The block (19) moves upward with the magnetic suction part (20). Then, the magnetic suction part (20) is rotated back to reset so that the block (19) is turned back to reset, that is, returned to the initial position.

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