CN111477992B - Explosion-proof protection shell based on lithium iron phosphate battery - Google Patents
Explosion-proof protection shell based on lithium iron phosphate battery Download PDFInfo
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- CN111477992B CN111477992B CN202010161492.8A CN202010161492A CN111477992B CN 111477992 B CN111477992 B CN 111477992B CN 202010161492 A CN202010161492 A CN 202010161492A CN 111477992 B CN111477992 B CN 111477992B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
- H01M2200/101—Bimetal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to an explosion-proof protective shell based on a lithium iron phosphate battery, which comprises a shell, a temperature sensing mechanism, a triggering mechanism, a tripping mechanism, a liquid cooling mechanism and an air cooling mechanism, wherein the lithium iron phosphate battery is arranged in the shell, the temperature sensing mechanism is arranged on the lithium iron phosphate battery and is connected with the triggering mechanism, the triggering mechanism is connected with the tripping mechanism, and the tripping mechanism is connected with the liquid cooling mechanism and the air cooling mechanism; according to the invention, the temperature sensing mechanism is linked with the overheating of the lithium iron phosphate battery, the tripping mechanism triggers the liquid cooling mechanism and the air cooling mechanism, the liquid cooling mechanism sprays cooling liquid to carry out emergency cooling on the lithium iron phosphate battery, the air cooling mechanism generates air flow through the fan blades to carry out air cooling and discharge internal steam, so that explosion caused by overlarge internal pressure is avoided, chain reaction after the lithium iron phosphate battery is overheated is avoided through a rapid cooling mode, the situation is prevented from continuously deteriorating, and thus the risk of overheating explosion of the lithium iron phosphate battery is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to an explosion-proof protective shell based on a lithium iron phosphate battery.
Background
In the charging process, part of lithium ions in the lithium iron phosphate are removed, transferred to a negative electrode through an electrolyte and embedded into a negative electrode carbon material; meanwhile, electrons are released from the anode and reach the cathode from an external circuit, so that the balance of chemical reaction is maintained.
In the discharging process, lithium ions are separated from the negative electrode and reach the positive electrode through the electrolyte, and meanwhile, electrons are released from the negative electrode and reach the positive electrode from an external circuit to provide energy for the outside. The lithium iron phosphate battery has the advantages of high working voltage, high energy density, long cycle life, good safety performance, low self-discharge rate and no memory effect.
The overcharge can cause lithium atoms in the anode material to completely run into the cathode material, so that the originally full grid of the anode is deformed and collapsed, and the overcharge is also a main reason for the reduction of the electric quantity of the lithium iron phosphate battery. In the process, more and more lithium ions are generated in the negative electrode, and lithium atoms grow out of stump crystals due to excessive accumulation, so that the lithium iron phosphate battery bulges.
The overcharge can cause lithium atoms in the anode material to completely run into the cathode material, so that the originally full grid of the anode is deformed and collapsed, and the overcharge is also a main reason for the reduction of the electric quantity of the lithium iron phosphate battery. In the process, more and more lithium ions are generated in the negative electrode, and lithium atoms grow out of stump crystals due to excessive accumulation, so that the lithium iron phosphate battery bulges.
In the first charge and discharge process of the liquid lithium ion battery, the electrode material and the electrolyte react on a solid-liquid phase interface to form a passivation layer covering the surface of the electrode material. The passivation layer film formed can effectively prevent the passage of electrolyte molecules, but Li + can be freely inserted and extracted through the passivation layer, having the characteristics of a solid electrolyte, and thus the passivation layer film is called SEI. The SEI film is not constant, and has little change in the charge and discharge process, and mainly a part of organic matters can change reversibly. And after the lithium iron phosphate battery pack is over-discharged, the SEI film is reversibly broken, and the negative electrode material is collapsed after the SEI of the negative electrode material is protected, so that the lithium iron phosphate battery is bulged.
If the heat cannot be dissipated after the battery is overheated, subsequent chain reaction can occur, and the subsequent chain reaction is converted into combustion and explosion by the bulge.
Disclosure of Invention
The invention aims to solve the problems and provide an explosion-proof protective shell based on a lithium iron phosphate battery, which can timely cool an overheated battery.
The invention realizes the purpose through the following technical scheme:
an explosion-proof protection shell based on a lithium iron phosphate battery comprises a shell, a temperature sensing mechanism, a triggering mechanism, a tripping mechanism, a liquid cooling mechanism and an air cooling mechanism, wherein the lithium iron phosphate battery is arranged in the shell, the temperature sensing mechanism is arranged on the lithium iron phosphate battery and connected with the triggering mechanism, the triggering mechanism is connected with the tripping mechanism, and the tripping mechanism is connected with the liquid cooling mechanism and the air cooling mechanism; when the lithium iron phosphate battery is overheated, the temperature sensing mechanism deforms to trigger the tripping mechanism, and the tripping mechanism triggers the liquid cooling mechanism and the air cooling mechanism to carry out emergency cooling treatment on the lithium iron phosphate battery;
the temperature sensing mechanism comprises a thermal deformation piece which is heated to deform upwards;
the trigger mechanism comprises a lever, a fulcrum and a roller, the tripping mechanism comprises a tripping rod and a wedge-shaped block, the left end of the lever is arranged at the top of the thermal deformation piece, the right part of the lever is rotatably connected with the shell through the fulcrum, the right end of the lever is provided with the roller through a wheel shaft, and the roller is rotatably connected with the lever;
the tripping rod is positioned above the lever, and a wedge-shaped block matched with the roller is arranged on the tripping rod and is in contact with the roller;
the liquid cooling mechanism comprises cooling liquid, a cylinder body, a piston rod, an energy storage piece and a retaining mechanism, the cylinder body is fixedly connected with a shell mechanism, a cylinder chamber is arranged in the cylinder body, the piston which is in interference fit with the cylinder body is arranged in the cylinder chamber, the piston and the cylinder body form a sealed space, the cooling liquid is filled in the sealed space, a liquid outlet is formed in one side of the cylinder body, the liquid outlet faces towards the lithium iron phosphate battery, the lower end of the piston is fixedly connected with the piston rod, the piston rod is connected with the retaining mechanism, the retaining mechanism is connected with a trip rod, the energy storage piece can store energy for the piston rod, the retaining mechanism can retain the state of the energy storage piece, the trip rod triggers the retaining mechanism to separate, the energy storage piece is released, the energy storage piece releases energy to push the piston to move towards the inside of the cylinder body, the pressure in the cylinder chamber is increased to push the cooling liquid to be sprayed out from the liquid outlet, and the overheated lithium iron phosphate battery is cooled.
As a further optimization scheme of the invention, the energy storage part comprises an energy storage spring, an upper spring seat and a lower spring seat, the upper spring seat is fixedly connected with the cylinder body, the lower spring seat is fixedly connected with the piston rod, and the energy storage spring is arranged between the lower spring seat and the upper spring seat.
As a further optimization scheme of the invention, the retaining mechanism comprises a retaining seat, a telescopic rod and a telescopic seat, the retaining seat is fixedly connected with a piston rod, a through hole which is in clearance fit with the telescopic rod is arranged on the retaining seat, the telescopic rod is inserted into the telescopic seat and is in clearance fit with the telescopic seat, the telescopic seat is fixedly connected with a shell, a blind hole which is communicated with the through hole is arranged on one side close to the trip rod, the trip rod is inserted into the blind hole, one end of the trip rod and one end of the telescopic rod which are inserted into the retaining seat are spherical, when the trip rod moves leftwards, the contact of the spherical end with the telescopic rod pushes the telescopic rod to move towards one side of the telescopic seat, the spherical end of the telescopic rod moves to the end part of the through hole, at the moment, the spherical end is in contact with the retaining seat, the spherical surface converts the radial pressure of the retaining seat on the telescopic rod into the thrust along the axial direction of the telescopic rod, the telescopic rod is completely separated from the retaining seat, the locking of the retaining seat cannot be maintained, and the piston rod can be pulled to move leftwards by the spring force.
As a further optimization scheme of the invention, the air cooling mechanism comprises a torsion spring, a torsion spring seat, a rotating seat, a blade shaft and a fan blade, wherein the torsion spring seat is fixedly connected with the shell, the torsion spring seat is connected with the rotating seat through the torsion spring, the center of the rotating seat is fixedly connected with the blade shaft, the right end of the blade shaft penetrates through the torsion spring seat and is fixedly connected with the fan blade, the left surface of the rotating seat is provided with a rectangular hole, the right end of the trip rod is inserted into the rectangular hole, and the right end of the trip rod is also provided with a rectangular part which is in clearance fit with the rectangular hole. The rotation of the rotating seat is limited by the matching of the rectangular part and the rectangular hole, so that the torsion spring is kept in an energy storage state, when the trip rod is separated from the rectangular hole, the locking of the rotating seat is released, the rotating seat becomes a free end, and the torsion spring releases energy to drive the rotating seat, the blade shaft and the fan blades to rotate, so that air cooling and heat dissipation are performed on the inside.
As a further optimization scheme of the invention, the blade shaft is rotationally connected with the torsion spring seat.
As a further optimization scheme of the invention, the temperature sensing mechanism is a bimetallic strip or other thermal expansion and deformation mechanisms.
As a further optimized scheme of the invention, the cooling liquid is water.
As a further optimization scheme of the invention, a liquid outlet of the cylinder body is connected with an injection cylinder, a cavity is arranged in the injection cylinder, the cavity is separated into two parts by a partition plate, a through hole is arranged on the partition plate, a pressure valve is arranged in the through hole, the space above the partition plate is communicated with a cylinder chamber of the cylinder body, the space below the partition plate is filled with a disintegrating agent, the bottom of the injection cylinder is provided with an injection port, and a plug is arranged on the injection port. When the piston rod pushes the cylinder chamber to increase the internal pressure of the cylinder chamber, so that the pressure of the cavity above the partition plate is increased, the pressure valve is opened, the cooling liquid enters the cavity below, and the disintegrating agent is disintegrated to generate a large amount of gas which is sprayed out of the jet orifice together with the cooling liquid to the battery cell, so that the battery cell is cooled more quickly.
The invention has the beneficial effects that:
1) According to the invention, the temperature sensing mechanism is linked with the overheating of the lithium iron phosphate battery, the tripping mechanism is used for triggering the liquid cooling mechanism and the air cooling mechanism, the liquid cooling mechanism is used for spraying cooling liquid to carry out emergency cooling on the lithium iron phosphate battery, the air cooling mechanism is used for generating air flow through the fan blades to carry out air cooling and discharge internal steam, so that explosion caused by overlarge internal pressure is avoided, the chain reaction of the lithium iron phosphate battery after overheating is avoided through a rapid cooling mode, the situation is prevented from continuously deteriorating, and the risk of the overheating explosion of the lithium iron phosphate battery is greatly reduced.
Drawings
FIG. 1 is a schematic structural diagram of the present invention in accordance with one embodiment;
FIG. 2 is a schematic diagram of the internal structure of the present invention according to the first embodiment;
fig. 3 is a schematic structural diagram of a liquid cooling mechanism according to a first embodiment of the present invention;
FIG. 4 is a schematic view of the holding mechanism of the present invention according to one embodiment;
FIG. 5 is a schematic diagram of the internal structure of the present invention in accordance with one embodiment;
fig. 6 is a schematic structural diagram of a liquid cooling mechanism according to a first embodiment of the present invention.
In the figure: the device comprises a shell 1, a temperature sensing mechanism 2, a trigger mechanism 3, a tripping mechanism 4, a liquid cooling mechanism 5 and an air cooling mechanism 6;
a thermally deformable member 21;
a lever 31, a fulcrum 32, a roller 33;
a trip bar 41, a wedge block 42;
the cooling liquid 51, the cylinder 52, the piston 53, the piston rod 54, the energy storage spring 55, the holding seat 56, the telescopic rod 57, the telescopic seat 58, the injection cylinder 59 and the partition plate 591;
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
Example one
As shown in fig. 1-4, an explosion-proof protective casing based on a lithium iron phosphate battery comprises a casing 1, a temperature sensing mechanism 2, a triggering mechanism 3, a tripping mechanism 4, a liquid cooling mechanism 5 and an air cooling mechanism 6, wherein the lithium iron phosphate battery is arranged in the casing 1, the temperature sensing mechanism 2 is arranged on the lithium iron phosphate battery, the temperature sensing mechanism 2 is connected with the triggering mechanism 3, the triggering mechanism 3 is connected with the tripping mechanism 4, and the tripping mechanism 4 is connected with the liquid cooling mechanism 5 and the air cooling mechanism 6; when the lithium iron phosphate battery is overheated, the temperature sensing mechanism 2 deforms to trigger the tripping mechanism 4, the tripping mechanism 4 triggers the liquid cooling mechanism 5 and the air cooling mechanism 6 to perform emergency cooling treatment on the lithium iron phosphate battery, and the subsequent chain reaction is prevented from causing explosion.
The temperature sensing mechanism 2 comprises a thermal deformation piece 21, and the thermal deformation piece 21 is deformed upwards by heat;
the trigger mechanism 3 comprises a lever 31, a fulcrum 32 and a roller 33, the trip mechanism 4 comprises a trip rod 41 and a wedge block 42, the left end of the lever 31 is arranged at the top of the thermal deformation piece 21, the right part of the lever 31 is rotatably connected with the shell 1 through the fulcrum 32, the right end of the lever 31 is provided with the roller 33 through a wheel shaft, and the roller 33 is rotatably connected with the lever 31;
the trip bar 41 is positioned above the lever 31, and the trip bar 41 is provided with a wedge block 42 matched with the roller 33, and the wedge block 42 is contacted with the roller 33. The thermal deformation member 21 deforms upwards to push the left end of the lever 31 to move upwards, the right end of the lever 31 moves downwards, the wedge block 42 converts the downward force of the lever 31 into a force along the axial direction of the trip rod 41, the trip rod 41 is pushed to move leftwards along the axial direction, and the roller 33 can convert the sliding friction force between the lever 31 and the wedge block 42 into a rolling friction force.
The liquid cooling mechanism 5 comprises a cooling liquid 51, a cylinder body 52, a piston 53, a piston rod 54, an energy storage part and a retaining mechanism, wherein the cylinder body 52 is fixedly connected with the shell 1 mechanism, a cylinder chamber is arranged inside the cylinder body 52, the piston 53 in interference fit with the cylinder body 52 is arranged in the cylinder chamber, the piston 53 and the cylinder body 52 form a sealed space, the cooling liquid 51 is filled in the sealed space, a liquid outlet is arranged on one side of the cylinder body 52 and faces towards the lithium iron phosphate battery, the lower end of the piston 53 is fixedly connected with the piston rod 54, the piston rod 54 is connected with the retaining mechanism, the retaining mechanism is connected with the trip rod 41, the energy storage part can store energy for the piston rod 54, the retaining mechanism can retain the state of the energy storage part, the trip rod 41 triggers the retaining mechanism to separate and release the energy storage part, the energy storage part can push the piston 53 to move towards the inside of the cylinder body 52, the pressure inside the cylinder chamber is increased to push the cooling liquid 51 to be sprayed out from the liquid outlet, and the overheated lithium iron phosphate battery is cooled.
Preferably, the energy storage member comprises an energy storage spring 55, an upper spring seat and a lower spring seat, the upper spring seat is fixedly connected with the cylinder body 52, the lower spring seat is fixedly connected with the piston rod 54, and the energy storage spring 55 is arranged between the lower spring seat and the upper spring seat. The energy storage spring 55 can store energy by stretching, and when the lower spring seat is released, the energy storage spring 55 releases energy to drive the piston rod 54 and the piston 53 to push upwards.
Preferably, the holding mechanism includes a holding seat 56, an expansion link 57 and an expansion seat 58, the holding seat 56 is fixedly connected with the piston rod 54, the holding seat 56 is provided with a through hole in clearance fit with the expansion link 57, the expansion link 57 is inserted into the expansion seat 58 and in clearance fit with the expansion seat 58, the expansion seat 58 is fixedly connected with the housing 1, one side close to the trip rod 41 is provided with a blind hole communicated with the through hole, the trip rod 41 is inserted into the blind hole, one end of the trip rod 41 and the expansion link 57 inserted into the holding seat 56 is in a spherical shape, when the trip rod 41 moves leftward, the contact of the expansion link 57 with the spherical end pushes the expansion link 57 to move toward the expansion seat 58, so that the spherical end of the expansion link 57 moves to the end of the through hole, at this time, the spherical end contacts with the holding seat 56, the spherical end converts the radial pressure of the holding seat 56 to 57 into the thrust along the axial direction of the expansion link 57, so that the expansion link 57 completely separates from the holding seat 56, the locking of the holding seat 56 cannot be maintained, and the spring force can pull the piston rod 54 to move leftward.
Preferably, the air cooling mechanism 6 includes a torsion spring 61, a torsion spring seat 62, a rotating seat 63, a vane shaft 64 and a vane 65, the torsion spring seat 62 is fixedly connected with the housing 1, the torsion spring seat 62 is connected with the rotating seat 63 through the torsion spring 61, the center of the rotating seat 63 is fixedly connected with the vane shaft 64, the right end of the vane shaft 64 penetrates through the torsion spring seat 62 and is fixedly connected with the vane 65, the left side of the rotating seat 63 is provided with a rectangular hole, the right end of the trip rod 41 is inserted into the rectangular hole, and the right end of the trip rod 41 is also provided with a rectangular part which is in clearance fit with the rectangular hole. Because the rotation of the rotating seat 63 is limited by the matching of the rectangular part and the rectangular hole, the torsion spring 61 is kept in an energy storage state, when the trip rod 41 is separated from the rectangular hole, the locking of the rotating seat 63 is released, the rotating seat 63 becomes a free end, and the torsion spring 61 releases energy to drive the rotating seat 63, the blade shaft 64 and the fan blade 65 to rotate, so that the air cooling and heat dissipation are performed on the inside.
Further, the vane axle 64 is rotatably connected to the torsion spring seat 62.
Preferably, the temperature sensing mechanism 2 is a bimetal or other thermal expansion and deformation mechanism.
Preferably, the coolant 51 is water.
The principle of the invention is as follows: according to the invention, the temperature sensing mechanism 2 is linked with the overheating of the lithium iron phosphate battery, the tripping mechanism 4 triggers the liquid cooling mechanism 5 and the air cooling mechanism 6, the liquid cooling mechanism 5 sprays cooling liquid 51 to cool the lithium iron phosphate battery in an emergency, the air cooling mechanism 6 generates air flow through the fan blades 65 to perform air cooling and discharge internal steam, so that the explosion caused by the overhigh internal pressure is avoided, the chain reaction of the lithium iron phosphate battery after overheating is avoided in a rapid cooling mode, the situation is prevented from being worsened continuously, and the risk of the overheating explosion of the lithium iron phosphate battery is greatly reduced.
Example two
As shown in fig. 5-6, on the basis of the first embodiment, the liquid outlet of the cylinder 52 is connected with a spraying cylinder 59, a cavity is arranged inside the spraying cylinder 59, the cavity is separated into two parts by a partition plate 591, a through hole is arranged on the partition plate 591, a pressure valve is arranged in the through hole, the space above the partition plate 591 is communicated with the cylinder chamber of the cylinder 52, the space below the partition plate 591 is filled with disintegrating agent, the bottom of the spraying cylinder 59 is provided with a spraying port, and the spraying port is provided with a plug. When the piston rod 54 pushes to increase the pressure in the cylinder chamber, so that the pressure in the cavity above the partition plate 591 is increased, the pressure valve is opened, the cooling liquid 51 enters the cavity below, and the disintegrating agent is disintegrated to generate a large amount of gas which is sprayed out of the spray opening together with the cooling liquid 51 to the battery cell, so that the battery cell is cooled more quickly.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention.
Claims (6)
1. The utility model provides an explosion-proof protective housing based on lithium iron phosphate battery which characterized in that: the lithium iron phosphate battery is arranged in the shell, the temperature sensing mechanism is arranged on the lithium iron phosphate battery, the temperature sensing mechanism is connected with the triggering mechanism, the triggering mechanism is connected with the tripping mechanism, and the tripping mechanism is connected with the liquid cooling mechanism and the air cooling mechanism; when the lithium iron phosphate battery is overheated, the temperature sensing mechanism deforms to trigger the tripping mechanism, and the tripping mechanism triggers the liquid cooling mechanism and the air cooling mechanism to carry out emergency cooling treatment on the lithium iron phosphate battery;
the temperature sensing mechanism comprises a thermal deformation piece which is deformed upwards when heated;
the trigger mechanism comprises a lever, a fulcrum and a roller, the tripping mechanism comprises a tripping rod and a wedge-shaped block, the left end of the lever is arranged at the top of the thermal deformation piece, the right part of the lever is rotatably connected with the shell through the fulcrum, the right end of the lever is provided with the roller through a wheel shaft, and the roller is rotatably connected with the lever;
the tripping rod is positioned above the lever, and a wedge-shaped block matched with the roller is arranged on the tripping rod and is in contact with the roller;
the liquid cooling mechanism comprises cooling liquid, a cylinder body, a piston rod, an energy storage piece and a retaining mechanism, the cylinder body is fixedly connected with a shell mechanism, a cylinder chamber is arranged in the cylinder body, the piston which is in interference fit with the cylinder body is arranged in the cylinder chamber, the piston and the cylinder body form a sealed space, the cooling liquid is filled in the sealed space, a liquid outlet is formed in one side of the cylinder body and faces towards the lithium iron phosphate battery, the lower end of the piston is fixedly connected with the piston rod, the piston rod is connected with the retaining mechanism, the retaining mechanism is connected with a trip rod, the energy storage piece can store energy for the piston rod, the retaining mechanism can retain the state of the energy storage piece, the trip rod triggers the retaining mechanism to separate, the energy storage piece is released, the energy storage piece releases energy to push the piston to move towards the interior of the cylinder body, the pressure in the cylinder chamber is increased to push the cooling liquid to be sprayed out from the liquid outlet, and the overheated lithium iron phosphate battery is cooled;
the retaining mechanism comprises a retaining seat, a telescopic rod and a telescopic seat, the retaining seat is fixedly connected with a piston rod, a through hole in clearance fit with the telescopic rod is formed in the retaining seat, the telescopic rod is inserted into the telescopic seat and is in clearance fit with the telescopic seat, the telescopic seat is fixedly connected with the shell, a blind hole communicated with the through hole is formed in one side close to the trip rod, the trip rod is inserted into the blind hole, and one end, inserted into the retaining seat, of the trip rod and the telescopic rod is spherical;
the air cooling mechanism comprises a torsion spring, a torsion spring seat, a rotating seat, a blade shaft and a fan blade, wherein the torsion spring seat is fixedly connected with the shell, the torsion spring seat is connected with the rotating seat through the torsion spring, the center of the rotating seat is fixedly connected with the blade shaft, the right end of the blade shaft penetrates through the torsion spring seat and is fixedly connected with the fan blade, a rectangular hole is formed in the left surface of the rotating seat, the right end of the trip rod is inserted into the rectangular hole, and the right end of the trip rod is also provided with a rectangular part which is in clearance fit with the rectangular hole;
the rotation of the rotating seat is limited through the clearance fit of the rectangular part and the rectangular hole so as to keep the torsion spring in an energy storage state, when the trip rod is separated from the rectangular hole, the locking of the rotating seat is released, the rotating seat becomes a free end, and the torsion spring releases energy to drive the rotating seat, the blade shaft and the fan blades to rotate so as to cool and radiate the inside.
2. The explosion-proof protective housing based on the lithium iron phosphate battery as claimed in claim 1, characterized in that: the energy storage piece comprises an energy storage spring, an upper spring seat and a lower spring seat, the upper spring seat is fixedly connected with the cylinder body, the lower spring seat is fixedly connected with the piston rod, and the energy storage spring is arranged between the lower spring seat and the upper spring seat.
3. The explosion-proof protective housing based on the lithium iron phosphate battery as claimed in claim 1, characterized in that: the blade shaft is rotationally connected with the torsion spring seat.
4. The explosion-proof protective housing based on the lithium iron phosphate battery as claimed in claim 1, characterized in that: the temperature sensing mechanism is a bimetallic strip.
5. The explosion-proof protective housing based on the lithium iron phosphate battery as claimed in claim 1, characterized in that: the cooling liquid is water.
6. The explosion-proof protective housing based on the lithium iron phosphate battery as claimed in claim 1, characterized in that: the liquid outlet of the cylinder body is connected with an injection cylinder, a cavity is arranged in the injection cylinder, the cavity is separated into two parts through a partition plate, a through hole is formed in the partition plate, a pressure valve is arranged in the through hole, the space above the partition plate is communicated with a cylinder chamber of the cylinder body, a disintegrating agent is filled in the space below the partition plate, an injection port is formed in the bottom of the injection cylinder, and a plug is arranged on the injection port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010161492.8A CN111477992B (en) | 2020-03-10 | 2020-03-10 | Explosion-proof protection shell based on lithium iron phosphate battery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010161492.8A CN111477992B (en) | 2020-03-10 | 2020-03-10 | Explosion-proof protection shell based on lithium iron phosphate battery |
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| CN111477992A CN111477992A (en) | 2020-07-31 |
| CN111477992B true CN111477992B (en) | 2022-10-04 |
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