Self-starting protection type lithium ion battery cell

Abstract

The utility model relates to the technical field of battery protection, in particular to a self-starting protection type lithium ion battery cell. According to the technical scheme, the battery comprises a protective shell, a battery core placed in the protective shell and two electrode lugs mounted on the battery core, and further comprises a detection self-starting assembly mounted in the protective shell, a shearing partition assembly mounted at the upper end of the detection self-starting assembly, and an air isolation assembly mounted on the detection self-starting assembly, by arranging the detection self-starting assembly, the shearing partition assembly and the air isolation assembly, the surface temperature of the battery cell is detected all the time, once the temperature is detected to be abnormal, connection between the battery cell and an external electric appliance is disconnected in a physical mode, so that the possibility that heat continues to be increased is reduced, and when the protective shell is closed, the battery cell is prevented from being damaged. And the perfluorohexanone liquid which is usually used for extinguishing the fire of the battery is released to submerge the battery core in the protective shell, so that the battery core is isolated from air, and the possibility of fire is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery protection, in particular to a self-starting protection type lithium-ion battery cell. Background Art

[0002] Lithium-ion batteries are high-energy-density rechargeable batteries that store and release energy through the intercalation and deintercalation of lithium ions between the positive and negative electrodes. During charging, lithium ions are deintercalated from the positive electrode material, pass through the electrolyte and separator, and then intercalate into the negative electrode material. During discharge, lithium ions are released from the negative electrode material and reintercalated into the positive electrode material, releasing electrons and generating current for the external circuit. The reversible charge and discharge process of lithium-ion batteries gives lithium-ion batteries a long cycle life.

[0003] When lithium-ion batteries are working, they may generate high temperatures and burn due to improper use, including overcharging or over-discharging, or some unexpected factors. Once this process starts, it often develops rapidly, posing a hidden danger to the safe use of lithium batteries.

[0004] Therefore, in view of the fact that once the above-mentioned lithium-ion battery cell fails and generates high temperature during operation, the situation will develop rapidly and cause combustion, which may easily cause safety hazards, a self-starting protection lithium-ion battery cell can be designed to solve the above problem. Utility Model Content

[0005] In order to overcome the problem that during the operation of lithium-ion batteries, high temperatures and combustion may be generated due to some improper use including overcharging and over-discharging, or some unexpected factors, this process often develops rapidly once it starts, thus posing a hidden danger to the safety of lithium batteries.

[0006] The technical solution of the utility model is: a self-starting protective lithium-ion battery cell, comprising a protective shell, a battery cell placed in the protective shell and two electrode ears installed on the battery cell, and also comprising a detection self-starting component installed in the protective shell, a shear partition component installed on the upper end of the detection self-starting component, and an air isolation component installed on the detection self-starting component; the detection self-starting component comprises an inner tank, a temperature sensor, a dual-axis motor, a first bevel gear threaded shaft, an inner bevel gear threaded shaft, and an outer bevel gear threaded shaft; the shear partition component comprises a slot, a cover plate, a sealing gasket, and an insulating knife; the air isolation component comprises a pad rib, a lifting groove, a liquid outlet groove, a blade slider, a perfluorohexanone capsule, and a pressure plate.

[0007] Preferably, when the temperature sensor detects that the surface temperature of the battery core is abnormal and exceeds the threshold, the dual-axis motor is started to rotate the first bevel threaded shafts on both sides, so that the inner bevel threaded shaft and the outer bevel threaded shaft rotate, and the rotation of the inner bevel threaded shaft causes the blade slider to rise and cut the perfluorohexanone capsule, and the rotation of the outer bevel threaded shaft causes the cover plate to descend, so that the insulating knife cuts off the electrode ear and inserts it into the slot to complete the disconnection between the battery core and the external electrical appliance, thereby reducing the possibility of continued heat increase, and inserting the sealing gasket into the protective shell and the inner liner. At the same time, the first bevel threaded shaft The rotation of the shaft will also cause the pressure plate to displace and squeeze the perfluorohexanone capsule that has been scratched, causing the perfluorohexanone liquid in the perfluorohexanone capsule to flow out from the liquid outlet and wrap and submerge the battery core. The perfluorohexanone liquid is completely squeezed out, and the sealing gasket is completely inserted into the interior of the protective shell and the inner liner. These two things are completed at the same time, so that the battery core is isolated from the air by the perfluorohexanone liquid. Perfluorohexanone is a colorless and odorless non-conductive transparent liquid at room temperature and is commonly used for battery fire extinguishing. It can quickly isolate the battery core from external electrical appliances and air to reduce the probability of fire.

[0008] Preferably, the inner liner is installed on the inner side of the protective shell; a temperature sensor is installed at the bottom end of the inner side of the inner liner; a dual-axis motor is installed at the lower end of the inner liner; both sides of the dual-axis motor are rotatably connected to the first bevel threaded shaft through a coupling; the temperature sensor is electrically connected to the battery cell; the dual-axis motor is electrically connected to the temperature sensor; the model of the temperature sensor is set to DS18B20.

[0009] Preferably, the first bevel threaded shaft is meshed with an internal bevel threaded shaft; both ends of the first bevel threaded shaft are meshed with external bevel threaded shafts; the thread pitch on the internal bevel threaded shaft is greater than that on the external bevel threaded shaft, and the thread pitch on the external bevel threaded shaft is equal to that of the first bevel threaded shaft.

[0010] Preferably, a slot is provided at the front end of the upper end face of the protective shell; the upper end of the external conical tooth threaded shaft passes through the inner shell and is gap-fitted with a cover plate, and the external conical tooth threaded shaft is rotatably connected to the upper end of the protective shell; a sealing gasket is fixed to the lower end of the cover plate; and an insulating switch is fixed to the front end of the sealing gasket.

[0011] Preferably, a padding rib fixedly connected to the protective shell and the inner container is provided at the upper end of the temperature sensor, and a tooth groove is provided on the padding rib; the battery core is arranged in the middle of the padding rib.

[0012] Preferably, a lifting groove opened inside the inner tank is provided on one side of the temperature sensor; the internal bevel thread shaft is rotatably connected to the lifting groove; and a liquid outlet groove is provided on one side of the lifting groove.

[0013] Preferably, a blade slider is slidably connected in the lifting groove; the blade slider is clearance-matched with the internal tapered thread shaft; and a perfluorohexanone capsule fixedly connected to the inner liner is provided on the other side of the lifting groove.

[0014] Preferably, a pressure plate is provided on one side of the perfluorohexanone capsule, and a sealing ring is fixed to the outer ring of the pressure plate; the lower end of the pressure plate is clearance-matched with the first bevel threaded shaft; and the upper end of the pressure plate is slidingly connected to the inner liner.

[0015] Beneficial effects of the utility model:

[0016] 1. By setting up a detection self-starting component, a shear partition component and an air isolation component, the surface temperature of the battery core is constantly monitored. Once an abnormal temperature is detected, the battery core is physically disconnected from the external electrical appliance to reduce the possibility of further heat increase. While sealing the protective shell, perfluorohexanone liquid, which is commonly used for battery fire extinguishing, is released to submerge the battery core inside the protective shell, thereby isolating the battery core from the air and significantly reducing the possibility of fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 What is shown is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 Shown is a schematic diagram of the slot structure of the present utility model;

[0019] Figure 3 Shown is a schematic diagram of the dual-axis motor structure of the present utility model;

[0020] Figure 4 Shown is a schematic diagram of the inner container structure of the present utility model;

[0021] Figure 5 Shown is a schematic diagram of the structure of the perfluorohexanone capsule of the present utility model;

[0022] Figure 6 Shown is a schematic diagram of the pressing plate structure of the present utility model;

[0023] Figure 7 Shown is a schematic diagram of the blade slider structure of the present invention.

[0024] Explanation of the accompanying drawings: 1. Protective shell; 2. Battery core; 3. Electrode ear; 401. Inner tank; 402. Temperature sensor; 403. Dual-axis motor; 404. First bevel threaded shaft; 405. Internal bevel threaded shaft; 406. External bevel threaded shaft; 501. Slot; 502. Cover plate; 503. Sealing gasket; 504. Insulating knife; 601. Pad; 602. Lifting groove; 603. Liquid outlet groove; 604. Blade slider; 605. Perfluorohexanone capsule; 606. Press plate. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0026] See also Figure 1-Figure 7 The utility model provides an embodiment: a self-starting protective lithium-ion battery cell, comprising a protective shell 1, a battery core 2 placed in the protective shell 1 and two electrode ears 3 installed on the battery core 2, and also comprising a detection self-starting component installed in the protective shell 1, a shear partition component installed on the upper end of the detection self-starting component, and an air isolation component installed on the detection self-starting component; the detection self-starting component comprises an inner tank 401, a temperature sensor 402, a dual-axis motor 403, a first bevel gear threaded shaft 404, an inner bevel gear threaded shaft 405, and an outer bevel gear threaded shaft 406; the shear partition component comprises a slot 501, a cover plate 502, a sealing gasket 503, and an insulating knife 504; the air isolation component comprises a pad 601, a lifting groove 602, a liquid outlet groove 603, a blade slider 604, a perfluorohexanone capsule 605, and a pressing plate 606.

[0027] See also Figure 2-Figure 7 In this embodiment, the inner liner 401 is mounted on the inner side of the protective shell 1; a temperature sensor 402 is mounted on the bottom of the inner side of the inner liner 401; a dual-axis motor 403 is mounted on the lower end of the inner liner 401; both sides of the dual-axis motor 403 are rotatably connected to a first bevel-toothed threaded shaft 404 via a coupling; the temperature sensor 402 is electrically connected to the battery cell 2; the dual-axis motor 403 is electrically connected to the temperature sensor 402; and an internal bevel-toothed threaded shaft 405 is engaged with the first bevel-toothed threaded shaft 404; Both ends of the first bevel threaded shaft 404 are engaged with an outer bevel threaded shaft 406; the thread pitch on the inner bevel threaded shaft 405 is greater than that on the outer bevel threaded shaft 406, and the thread pitch on the outer bevel threaded shaft 406 is equal to that of the first bevel threaded shaft 404; a slot 501 is provided at the front end of the upper end surface of the protective shell 1; the upper end of the outer bevel threaded shaft 406 passes through the inner liner 401 and is clearance-fitted with a cover plate 502, and the outer bevel threaded shaft 406 is rotatably connected to the upper end of the protective shell 1; the cover plate 502 is The lower end is fixed with a sealing gasket 503; the front end of the sealing gasket 503 is fixed with an insulating knife 504; the upper end of the temperature sensor 402 is provided with a pad 601 fixed with the protective shell 1 and the inner tank 401, and the pad 601 is provided with a tooth groove; the battery core 2 is arranged in the middle of the pad 601; one side of the temperature sensor 402 is provided with a lifting groove 602 opened inside the inner tank 401; the inner bevel tooth thread shaft 405 is rotatably connected to the lifting groove 602; one side of the lifting groove 602 is provided with a tooth groove. Liquid outlet groove 603; a blade slider 604 is slidably connected to the lifting groove 602; the blade slider 604 is clearance-matched with the inner bevel threaded shaft 405; a perfluorohexanone capsule 605 fixedly connected to the inner liner 401 is provided on the other side of the lifting groove 602; a pressure plate 606 is provided on one side of the perfluorohexanone capsule 605, and a sealing ring is fixedly connected to the outer ring of the pressure plate 606; the lower end of the pressure plate 606 is clearance-matched with the first bevel threaded shaft 404; the upper end of the pressure plate 606 is slidably connected to the inner liner 401.

[0028] When in use, the battery cell 2 is connected to external circuits and electrical appliances via the electrode tabs 3. During charging, lithium ions are deintercalated from the positive electrode material in the battery cell 2, pass through the electrolyte and the separator, and are embedded in the negative electrode material. During discharging, lithium ions are released from the negative electrode material in the battery cell 2 and re-intercalated into the positive electrode material, while releasing electrons to generate current for use by the external circuit. The temperature sensor 402 uses this current to detect the surface temperature of the battery cell 2.

[0029] When the temperature sensor 402 detects that the surface temperature of the battery core 2 is abnormal and exceeds the threshold, the dual-axis motor 403 is started to rotate the first bevel threaded shafts 404 on both sides, so that the inner bevel threaded shaft 405 and the outer bevel threaded shaft 406 rotate. The rotation of the inner bevel threaded shaft 405 causes the blade slider 604 to rise and cut the perfluorohexanone capsule 605. The rotation of the outer bevel threaded shaft 406 causes the cover plate 502 to descend, so that the insulating knife 504 cuts off the electrode ear 3 and inserts it into the slot 501, thereby completing the disconnection between the battery core 2 and the external electrical appliance, thereby reducing the possibility of further heat increase, and allowing the sealing gasket 503 to be inserted into the protective shell 1 and the inner liner 401;

[0030] At the same time, the rotation of the first bevel threaded shaft 404 will also cause the pressure plate 606 to displace and squeeze the perfluorohexanone capsule 605 that has been scratched, so that the perfluorohexanone liquid in the perfluorohexanone capsule 605 flows out from the liquid outlet 603 and wraps and submerges the battery core 2. The perfluorohexanone liquid is completely squeezed out, and the sealing gasket 503 is completely inserted into the interior of the protective shell 1 and the inner liner 401. These two things are completed at the same time to isolate the battery core 2 from the air through the perfluorohexanone liquid. Perfluorohexanone is a non-conductive transparent liquid that is colorless and odorless at room temperature and is commonly used for battery fire extinguishing. It can quickly isolate the battery core 2 from external electrical appliances and air to reduce the probability of fire.

[0031] Through the above steps, by setting up the detection self-starting component, the shear partition component and the air isolation component, the surface temperature of the battery core 2 is constantly monitored. Once a temperature abnormality is detected, the battery core 2 is physically disconnected from the external electrical appliance to reduce the possibility of further heat increase. While the protective shell 1 is sealed, perfluorohexanone liquid commonly used for battery fire extinguishing is released to submerge the battery core 2 inside the protective shell 1, thereby isolating the battery core 2 from the air and significantly reducing the possibility of fire.

Claims

1. A self-starting protective lithium-ion battery cell, comprising a protective shell (1), a battery cell (2) placed in the protective shell (1), and two electrode ears (3) mounted on the battery cell (2); characterized in that: The invention also includes a detection self-starting component installed in the protective shell (1), a shearing isolation component installed on the upper end of the detection self-starting component, and an air isolation component installed on the detection self-starting component; the detection self-starting component includes an inner shell (401), a temperature sensor (402), a double-axis motor (403), a first bevel gear threaded shaft (404), an inner bevel gear threaded shaft (405), and an outer bevel gear threaded shaft (406); the shearing isolation component includes a slot (501), a cover plate (502), a sealing gasket (503), and an insulating knife (504); and the air isolation component includes a pad rib (601), a lifting groove (602), a liquid outlet groove (603), a blade slider (604), a perfluorohexanone capsule (605), and a pressing plate (606).

2. The self-protected lithium-ion battery cell according to claim 1, characterized in that: The inner liner (401) is installed on the inner side of the protective shell (1); a temperature sensor (402) is installed at the bottom end of the inner side of the inner liner (401); a double-axis motor (403) is installed at the lower end of the inner liner (401); both sides of the double-axis motor (403) are rotatably connected to a first bevel-toothed threaded shaft (404) through a coupling; the temperature sensor (402) is electrically connected to the battery core (2); and the double-axis motor (403) is electrically connected to the temperature sensor (402).

3. The self-protected lithium-ion battery cell according to claim 2, wherein: An internal conical threaded shaft (405) is meshed with the first conical threaded shaft (404); both ends of the first conical threaded shaft (404) are meshed with external conical threaded shafts (406); the thread pitch on the internal conical threaded shaft (405) is greater than that on the external conical threaded shaft (406), and the thread pitch on the external conical threaded shaft (406) is equal to that of the first conical threaded shaft (404).

4. The self-protected lithium-ion battery cell according to claim 1, wherein: A slot (501) is provided at the front end of the upper end surface of the protective shell (1); the upper end of the external bevel threaded shaft (406) passes through the inner liner (401) and is loosely fitted with a cover plate (502), and the external bevel threaded shaft (406) is rotatably connected to the upper end of the protective shell (1); a sealing gasket (503) is fixedly connected to the lower end of the cover plate (502); and an insulating knife (504) is fixedly connected to the front end of the sealing gasket (503).

5. The self-protected lithium-ion battery cell according to claim 2, wherein: The upper end of the temperature sensor (402) is provided with a padding rib (601) fixedly connected to the protective shell (1) and the inner liner (401), and a tooth groove is provided on the padding rib (601); the battery core (2) is arranged in the middle of the padding rib (601).

6. The self-protected lithium-ion battery cell according to claim 2, characterized in that: A lifting groove (602) is provided on one side of the temperature sensor (402) and is opened inside the inner container (401); the internal tapered thread shaft (405) is rotatably connected to the lifting groove (602); and a liquid outlet groove (603) is opened on one side of the lifting groove (602).

7. The self-protected lithium-ion battery cell according to claim 6, characterized in that: A blade slider (604) is slidably connected in the lifting groove (602); the blade slider (604) is clearance-matched with the internal tapered thread shaft (405); and a perfluorohexanone capsule (605) fixedly connected to the inner liner (401) is provided on the other side of the lifting groove (602).

8. The self-protected lithium-ion battery cell according to claim 7, characterized in that: A pressing plate (606) is provided on one side of the perfluorohexanone capsule (605), and a sealing ring is fixed to the outer ring of the pressing plate (606); the lower end of the pressing plate (606) is clearance-matched with the first tapered threaded shaft (404); and the upper end of the pressing plate (606) is slidably connected to the inner liner (401).

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