Lithium battery pack with over-discharge protection structure

Abstract

The utility model provides a lithium battery pack with an over-discharge protection structure, which comprises a shell, the shell is connected with a plurality of stacked battery cells and clapboards, a plurality of air grooves are arranged in the clapboards, an air inlet pipe and an air outlet pipe are fixedly connected below the battery cells and the clapboards, and two ends of the air grooves are respectively connected with one ends of the air inlet pipe and the air outlet pipe. The shell and the other end of the air outlet pipe are fixedly connected with a supporting table, one side of the supporting table is fixedly connected with a ventilation fan, one side of the ventilation fan is fixedly connected to the air inlet pipe, a limiting table is fixedly connected above the supporting table, the other end of the limiting table is fixedly connected to the battery cell and the bottom of the partition plate, and a through hole is formed in the middle limiting table; an airflow channel is formed by the partition built-in air grooves, the air inlet pipe and the air outlet pipe and matched with the ventilation fan to forcibly circulate air. When the temperature monitoring part detects that the battery cells are overheated, the ventilation fan is started to drive airflow to flow through gaps of the battery cells, synchronous cooling of the multiple battery cells is achieved, and the heat diffusion speed is effectively delayed.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery pack technology, and in particular to a lithium battery pack with an over-discharge protection structure. Background Technology

[0002] Lithium-ion battery packs must be protected against over-discharge, primarily because over-discharge can cause irreversible chemical damage and safety risks. When the battery voltage falls below the safe threshold due to continuous discharge, the internal active material structure of the battery will be damaged: excessive lithium-ion intercalation and deintercalation cause the collapse of the graphite negative electrode layered structure, and the positive electrode material lattice distortion occurs. At the same time, the electrolyte decomposes to produce gases (such as CO2) and byproducts, resulting in permanent capacity decay. In addition, the battery cells will generate high heat during over-discharge, which can lead to open circuits and thermal runaway in severe cases.

[0003] A search revealed a Chinese patent publication number CN219643075U, which discloses a lithium battery pack with over-discharge protection, including a base plate, an outer shell mounted on the top of the base plate, a storage cavity inside the outer shell, a lithium battery placed inside the storage cavity, a control board connected to one side of the outer shell, and a voltage monitoring meter connected to the top of the control board.

[0004] To address the problem that the aforementioned technologies cannot effectively dissipate heat by relying solely on the heat-conducting plate attached to the outside, and that the temperature decreases when it rises, a lithium battery pack with an over-discharge protection structure is proposed. Utility Model Content

[0005] In view of this, the present invention aims to provide a lithium battery pack with an over-discharge protection structure to solve or alleviate the technical problems existing in the prior art, and at least provide a beneficial option.

[0006] The technical solution of this utility model embodiment is implemented as follows: it includes an outer shell, the outer shell is connected to a plurality of stacked battery cells and a partition, the partition has a plurality of air slots inside, an air inlet pipe and an air outlet pipe are fixedly connected below the battery cells and the partition, the two ends of the air slots are respectively connected to one end of the air inlet pipe and the air outlet pipe, the other end of the outer shell and the air outlet pipe is fixedly connected to a support platform, a ventilation fan is fixedly connected to one side of the support platform, and one side of the ventilation fan is fixedly connected to the air inlet pipe.

[0007] In some embodiments, a limiting platform is fixedly connected above the support platform, and the other end of the limiting platform is fixedly connected to the bottom of the battery cell and the separator. A through hole is opened inside the limiting platform in the middle.

[0008] In some embodiments, the bottom of the support platform has multiple air holes, a sealing plate is slidably connected to one side of the air holes, and a toothed rod is fixedly connected to the other end of the sealing plate.

[0009] In some embodiments, a bottom cover is fixedly connected to the bottom of the support platform, an opening and closing motor is fixedly connected to one side of the bottom cover, and a synchronous gear is fixedly connected to the power output end of the opening and closing motor, with the synchronous gear meshing with a gear rack on both sides.

[0010] In some embodiments, a pressure valve is fixedly connected to one side of the air outlet pipe, and a weakening groove is opened on one side of the toothed rod below the air outlet pipe.

[0011] In some embodiments, a top cover is fixedly connected above the housing and the battery cell, and a temperature monitoring component is fixedly connected to the inner wall of the housing, with one side of the temperature monitoring component attached to the side of the battery cell.

[0012] In some embodiments, a control component is fixedly connected to the bottom of the support platform, and the control component is electrically connected to the opening and closing motor, the ventilation fan, and the temperature monitoring component.

[0013] In some embodiments, thermally conductive adhesive tapes are fixedly connected to both sides of the partition, and the other end of the thermally conductive adhesive tapes is attached to the battery cell.

[0014] The present invention has the following advantages due to the adoption of the above technical solution:

[0015] This application utilizes a partition with built-in air slots to form an airflow channel with the air inlet and outlet pipes, which, in conjunction with a ventilation fan, forces the air to circulate. When the temperature monitoring component detects that a cell is overheating, the ventilation fan is activated to drive airflow through the gaps between the cells, achieving simultaneous cooling of multiple cells and effectively slowing down the rate of heat diffusion.

[0016] The opening and closing control is achieved by misaligning the vents and the sealing plate through the grid. The synchronous gear driven by the opening and closing motor adjusts the displacement of the rack. When the temperature rises abnormally, the vents are opened to enhance heat dissipation. During the stage of violent gas production, the pressure valve is combined with the rack weakening groove design to force pressure relief by opening the valve body with air pressure or shearing the rack, thus avoiding the risk of explosion caused by the sealing structure.

[0017] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is the main view of the structure of this utility model.

[0020] Figure 2 This is a diagram of the internal structure of this utility model.

[0021] Figure 3 This is a cross-sectional view of the partition structure of this utility model.

[0022] Figure 4 This is a partially exploded structural diagram of the present invention.

[0023] Figure 5 This is an exploded structural diagram of the support platform of this utility model.

[0024] Figure label:

[0025] 1. Outer shell; 2. Top cover; 3. Support platform; 4. Bottom cover; 5. Limiting platform; 6. Air inlet pipe; 7. Air outlet pipe; 8. Battery cell; 9. Partition plate; 10. Air groove; 11. Pressure valve; 12. Thermal conductive adhesive; 13. Through hole; 14. Air hole; 15. Sealing plate; 16. Opening and closing motor; 17. Gear rack; 18. Weakening groove; 19. Control component; 20. Synchronous gear; 21. Ventilation fan; 22. Temperature monitoring component. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0027] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Example 1

[0028] like Figure 1-5 As shown, a lithium battery pack with an over-discharge protection structure includes a shell 1. The shell 1 is connected to multiple stacked battery cells 8 and separators 9. The separators 9 are located between two battery cells 8 and can play a role in cooling and support. Multiple air slots 10 are opened inside the separators 9. An air inlet pipe 6 and an air outlet pipe 7 are fixedly connected below the battery cells 8 and the separators 9. The two ends of the air slots 10 are respectively connected to one end of the air inlet pipe 6 and the air outlet pipe 7. The other end of the shell 1 and the air outlet pipe 7 are fixedly connected to a support platform 3. A ventilation fan 21 is fixedly connected to one side of the support platform 3, and one side of the ventilation fan 21 is fixedly connected to the air inlet pipe 6.

[0029] A top cover 2 is fixedly connected above the outer shell 1 and the battery cell 8. A temperature monitoring component 22 is fixedly connected to the inner wall of the outer shell 1, and one side of the temperature monitoring component 22 is attached to the side of the battery cell 8.

[0030] A voltage monitoring component is installed on the top cover 2, which can be used to monitor the discharge voltage. At the same time, the temperature monitoring component 22 can monitor the temperature of the cell 8 from the side.

[0031] When the internal battery cell 8 heats up due to over-discharge, the ventilation fan 21 can be activated to blow air into the air slot 10 inside the partition 9. At this time, the air passes through the inside of the partition 9 and is discharged from the device again through the air outlet pipe 7. This can cool down the battery cells 8 on both sides of the partition 9. Since there are multiple partitions 9 inside, the battery cells 8 on both sides can be cooled down at the same time, which has a better protection effect and can more effectively prevent thermal runaway caused by overheating.

[0032] In this embodiment, a limiting platform 5 is fixedly connected above the support platform 3. The other end of the limiting platform 5 is fixedly connected to the bottom of the battery cell 8 and the separator 9. The limiting platform 5 in the middle has a through hole 13. The limiting platform 5 can support the battery cell 8 and the separator 9 from the bottom.

[0033] In this embodiment, the bottom of the support platform 3 has multiple air holes 14, a sealing plate 15 is slidably connected to one side of the air holes 14, and a toothed rod 17 is fixedly connected to the other end of the sealing plate 15.

[0034] Both the vent 14 and the sealing plate 15 are equipped with grid plates. When the grid plates in the vent 14 and the sealing plate 15 are staggered, the vent 14 is blocked. When the grid plates are aligned, the vent 14 is unobstructed.

[0035] The bottom of the support platform 3 is fixedly connected to the bottom cover 4, and the bottom cover 4 is fixedly connected to one side of the opening and closing motor 16. The power output end of the opening and closing motor 16 is fixedly connected to the synchronous gear 20. The synchronous gear 20 meshes with the gear 17 on both sides. When the battery cell 8 starts to rise abnormally, the opening and closing motor 16 can be started to drive the synchronous gear 20 to rotate. Then, the gear 17 on both sides moves inward to make the air hole 14 unobstructed, allowing gas to enter and exit for cooling.

[0036] In this embodiment, a pressure valve 11 is fixedly connected to one side of the vent pipe 7, and a weakening groove 18 is opened on one side of the toothed rod 17 below the vent pipe 7. When the battery cell 8 experiences thermal runaway and violent gas release, the gas pressure rises and can open the pressure valve 11, allowing the gas to be discharged from the vent pipe 7 to prevent an explosion. At the same time, the weakening groove 18 can reduce the strength of the toothed rod 17 below the vent pipe 7, so that the toothed rod 17 can be broken when the gas is discharged, preventing the vent hole 14 from being blocked and unable to release pressure.

[0037] In this embodiment: a voltage monitoring component is installed on the top cover 2, which can be used to monitor the discharge voltage, while the temperature monitoring component 22 can monitor the temperature of the cell 8 from the side.

[0038] When the internal battery cell 8 heats up due to over-discharge, the ventilation fan 21 can be activated to blow air into the air slot 10 inside the partition 9. At this time, the air passes through the inside of the partition 9 and is discharged from the device again through the air outlet pipe 7. This can cool down the battery cells 8 on both sides of the partition 9. Since there are multiple partitions 9 inside, the battery cells 8 on both sides can be cooled down at the same time, which has a better protection effect and can more effectively prevent thermal runaway caused by overheating.

[0039] The limiting platform 5 in the middle has a through hole 13 inside. The limiting platform 5 can support the battery cell 8 and the partition plate 9 from the bottom. The vent 14 and the sealing plate 15 are both equipped with grid plates. When the vent 14 and the grid plates in the sealing plate 15 are intersected, the vent 14 is blocked. When the grid plates are aligned, the vent 14 is unobstructed. When the battery cell 8 starts to rise abnormally, the opening and closing motor 16 can be started to drive the synchronous gear 20 to rotate. Then, the gears 17 on both sides move inward to make the vent 14 unobstructed, allowing gas to enter and exit for cooling.

[0040] When cell 8 experiences thermal runaway and violent gas release, the increased gas pressure can open pressure valve 11, allowing gas to be discharged from vent pipe 7 to prevent explosion. At the same time, weakening groove 18 can reduce the strength of toothed rod 17 below vent pipe 7, allowing the toothed rod 17 to be broken when gas is discharged, preventing vent hole 14 from being blocked and unable to release pressure. Example 2

[0041] This embodiment of the lithium battery pack with over-discharge protection structure is improved based on Embodiment 1 as follows: Figure 1-5 As shown,

[0042] In this embodiment, a control component 19 is fixedly connected to the bottom of the support platform 3. The control component 19 is electrically connected to the opening and closing motor 16, the ventilation fan 21 and the temperature monitoring component 22. The control component 19 controls the electronic components in the device in the existing way, and the control component 19 has a power supply to supply power to the opening and closing motor 16 and the ventilation fan 21. At the same time, the control component 19 can also receive the discharge voltage monitored by the top cover 2.

[0043] In this embodiment, thermally conductive adhesive tapes 12 are fixedly connected to both sides of the partition 9, and the other end of the thermally conductive adhesive tape 12 is attached to the battery cell 8. The thermally conductive adhesive tape 12 can make the battery cell 8 and the partition 9 fit together better, so that the battery cell 8 can use the partition 9 to conduct heat normally at different temperatures.

[0044] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A lithium battery pack with an over-discharge protection structure, comprising a casing (1), characterized in that: The outer shell (1) is connected to multiple stacked battery cells (8) and partitions (9). Multiple air slots (10) are opened inside the partitions (9). An air inlet pipe (6) and an air outlet pipe (7) are fixedly connected below the battery cells (8) and the partitions (9). The two ends of the air slots (10) are respectively connected to one end of the air inlet pipe (6) and the air outlet pipe (7). A support platform (3) is fixedly connected to the other end of the outer shell (1) and the air outlet pipe (7). A ventilation fan (21) is fixedly connected to one side of the support platform (3). One side of the ventilation fan (21) is fixedly connected to the air inlet pipe (6).

2. The lithium battery pack with over-discharge protection structure according to claim 1, characterized in that: The support platform (3) is fixedly connected to the upper part of the limiting platform (5), and the other end of the limiting platform (5) is fixedly connected to the bottom of the battery cell (8) and the partition (9). The limiting platform (5) in the middle has a through hole (13).

3. The lithium battery pack with over-discharge protection structure according to claim 2, characterized in that: The support platform (3) has multiple air holes (14) at its bottom. A sealing plate (15) is slidably connected to one side of the air hole (14), and a toothed rod (17) is fixedly connected to the other end of the sealing plate (15).

4. The lithium battery pack with over-discharge protection structure according to claim 3, characterized in that: The bottom of the support platform (3) is fixedly connected to a bottom cover (4), and a motor (16) is fixedly connected to one side of the bottom cover (4). A synchronous gear (20) is fixedly connected to the power output end of the motor (16), and the synchronous gear (20) meshes with the rack (17) on both sides.

5. The lithium battery pack with over-discharge protection structure according to claim 4, characterized in that: A pressure valve (11) is fixedly connected to one side of the air outlet pipe (7), and a weakening groove (18) is opened on one side of the toothed rod (17) below the air outlet pipe (7).

6. The lithium battery pack with over-discharge protection structure according to claim 5, characterized in that: A top cover (2) is fixedly connected above the outer shell (1) and the battery cell (8). A temperature monitoring component (22) is fixedly connected to the inner wall of the outer shell (1). One side of the temperature monitoring component (22) is attached to the side of the battery cell (8).

7. The lithium battery pack with over-discharge protection structure according to claim 3, characterized in that: The bottom of the support platform (3) is fixedly connected to a control component (19), which is electrically connected to the opening and closing motor (16), the ventilation fan (21), and the temperature monitoring component (22).

8. The lithium battery pack with over-discharge protection structure according to claim 1, characterized in that: Thermally conductive adhesive tape (12) is fixedly connected to both sides of the partition (9), and the other end of the thermally conductive adhesive tape (12) is attached to the battery cell (8).

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