CN110596592A - Low-earth safety protection method for battery pack thermal diffusion test - Google Patents
Low-earth safety protection method for battery pack thermal diffusion test Download PDFInfo
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- CN110596592A CN110596592A CN201910821100.3A CN201910821100A CN110596592A CN 110596592 A CN110596592 A CN 110596592A CN 201910821100 A CN201910821100 A CN 201910821100A CN 110596592 A CN110596592 A CN 110596592A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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Abstract
A method for protecting safety of a battery pack from low ground in a thermal diffusion test is characterized in that a sunken battery pack thermal runaway test method is adopted, a battery pack is placed on a liftable stainless steel structure platform for testing, and the stainless steel structure platform is located at the highest position and is exposed out of the ground during testing; after the test is finished, the stainless steel structure platform descends until the battery pack is completely immersed in the sunken water tank, so that cooling, fire extinguishing, smoke extinguishing and safety isolation of the battery pack are realized. According to the invention, through a sunken water tank, after the battery pack test is finished, the battery pack is sunken into the water tank, so that the cooling, fire extinguishing, smoke extinguishing and safety isolation of the battery pack can be realized more safely.
Description
Technical Field
The invention relates to a test method of a power battery, in particular to a low-ground safety protection method of a battery pack thermal diffusion test, which can carry out the battery pack thermal diffusion test more safely and is very stable in the whole operation process of the battery pack thermal diffusion test; belongs to the technical field of power battery tests.
Background
The battery pack has wide market prospect and high research value, related test verification work is frequently carried out, most of the related test verification work is destructive tests, safety accidents such as electric leakage, fire, smoke, explosion and the like of the battery pack can occur in the test process, and personal and property safety of crisis can occur. In order to reduce the safety risk in the test process and isolate the hazard source, relevant safety measures for guaranteeing the life and property safety of the test personnel and equipment are imperative. In order to meet the requirements of the specification of electric motor coach safety technical conditions, thermal runaway tests are required to be carried out on battery packs before delivery, however, potential safety hazards caused by short circuits in the cells cannot be eliminated and avoided due to unpredictability and irreproducibility of short circuits in the cells in the thermal runaway test process, and therefore thermal runaway of power battery cells and thermal expansion experiments of battery systems are key points and difficulties of research in the power battery industry.
The current battery pack thermal runaway test is mainly carried out through a battery pack thermal runaway test platform; the battery pack thermal runaway test platform is mainly used for researching thermal runaway tests of new energy vehicles such as electric motor coaches and passenger vehicles, so that the safety performance of the new energy vehicles is evaluated, and design details such as product structural strength are optimized through experimental data. The thermal runaway test comprises the steps of researching and testing and verifying a thermal runaway triggering mode of the monomer module; the triggering mode of thermal runaway is as follows: needle punching, overcharging, and heating. In the acupuncture test, a steel needle penetrates through the battery, the steel needle is used as a carrier to destroy a diaphragm of the battery, so that a short circuit between a positive electrode and a negative electrode is generated, and the thermal runaway of the battery is triggered; the overcharge test is that the internal material structure of the battery is collapsed and damaged in a charging mode, so that the thermal runaway of a battery core is caused; the heating mode is that the battery is continuously heated by an external heat source until the diaphragm is melted and the electric core is out of control thermally. The three modes inevitably introduce external influencing factors, namely a steel needle in needling, continuous energy perfusion in overcharging and a continuous heat source in heating. However, in the tests of overcharge safety, overdischarge safety, extrusion, dropping, needling, short circuit and the like of the single module, fire and explosion can occur in the tests, so that it is necessary for the battery to safely and quickly extinguish the fire after the battery is subjected to the fire and explosion in the test process.
However, fire extinguishing in the thermal runaway test of the battery pack is considered from the self explosion-proof performance and the dry powder fire extinguishing mode, and the fire extinguishing safety protection consideration for the test can play a certain role, but because the thermal runaway test is carried out on the ground at present, cooling, temperature reduction and the like are finished on the ground after the battery pack test is carried out, so that safety accidents easily occur, and therefore the improvement is needed.
Patent documents in which the same technology as that of the present invention is not found through patent search are reported, and the following patents which have a certain relationship with the present invention are mainly included:
1. the patent number is CN201611201012.6, and the name is "automatic test equipment that soaks of power battery package", the applicant is: the invention patent of the national union automobile power battery research institute, llc, discloses a test platform for detecting thermal runaway diffusion of lithium ion batteries, comprising an explosion-proof environment box for placing a battery module to be tested, a short-circuit device and a charge-discharge device, wherein the short-circuit device is connected with the battery to be tested in the explosion-proof environment box through a wire, the charge-discharge device is connected with the battery module to be tested in the explosion-proof environment box through a wire, and a high-speed camera is arranged at the top of the explosion-proof environment box; and a gas outlet of the explosion-proof environment box is connected with a smoke analysis device.
2. The patent number is CN201721060960.2, is named as "a power battery package extrusion test device for electric automobile", the applicant is: the utility model discloses a Chinese automobile technical research center practical novel patent, which discloses a power battery pack extrusion test device for an electric automobile, comprising a mechanical system and a hydraulic system; the mechanical system comprises a sample placing platform, one end of the sample placing platform is provided with a hydraulic cylinder supporting upright post, the other end of the sample placing platform is provided with an extrusion bearing upright post, an adjusting block is fixed on the extrusion bearing upright post, four vertex angles of the sample placing platform are respectively connected with an upright post, the sample placing platform is lifted through a lifting device, and a water tank is arranged below the sample placing platform; the hydraulic system comprises a hydraulic cylinder and an extrusion head mounting plate, the hydraulic cylinder is fixed on a hydraulic cylinder supporting upright post, the extrusion head is mounted on the extrusion head mounting plate, and a hydraulic cylinder push rod extends out to push the extrusion head to horizontally extrude the battery. The hydraulic system comprises a hydraulic cylinder and an extrusion head mounting plate, the hydraulic cylinder is fixed on a hydraulic cylinder supporting stand column, a threaded hole is formed in the extrusion head mounting plate, the extrusion head can be horizontally or vertically placed on the extrusion mounting plate, and a hydraulic cylinder push rod stretches out to push the extrusion head to horizontally extrude the battery.
3. The patent number is CN201820224153.8, the name is "vertical intelligent single double-belting machine", the applicant is: the patent discloses a test device for the thermal runaway suppression efficiency of a battery pack thermal management system, which comprises a test part, a battery thermal runaway trigger part, a battery state monitoring part, an emergency fire extinguishing part, a smoke detection system and an intelligent control system; the testing part comprises a cuboid testing box and a testing platform fixed on a bottom plate of the cuboid testing box, and the testing platform comprises a grid plate for placing a battery pack to be tested and an L-shaped clamping plate for fixing the battery pack to be tested; the battery thermal runaway triggering part comprises a stainless steel heating pipe, a needling extrusion device and a battery charge and discharge tester; the stainless steel heating pipe is positioned between the rectangular testing box bottom plate and the grid plate; the needling extrusion device is fixedly connected with a top plate of the cuboid test box, and needling or extrusion on the battery pack to be tested is realized by the needling extrusion device; the battery charge-discharge tester is electrically connected with the anode and the cathode of the battery pack to be tested through leads; the battery state monitoring part comprises a temperature sensor and a thermal imager; the temperature sensor is arranged in a wire guide groove of the L-shaped clamping plate; the thermal imager is arranged inside the cuboid test box, and a lens of the thermal imager is aligned to the test board; the emergency fire extinguishing part is connected with the testing part to realize emergency fire extinguishing.
Through careful analysis of the above patents, although some of the patents relate to battery tests and some of the patents also relate to thermal runaway tests of battery packs, some improved technical solutions have been proposed, through careful analysis, the thermal runaway tests of the batteries still remain on the original common safety protection measures, namely, the safety fire extinguishing protection is still performed through dry powder, so that the problems mentioned above still exist, and further research and improvement are needed.
Disclosure of Invention
The invention aims to provide a novel low-ground safety protection method for a battery pack thermal diffusion test, aiming at the problems that a safety protection part is very safe and deflagration accidents and the like are easy to occur in the cooling and cooling process during the existing battery pack thermal runaway test.
In order to achieve the purpose, the invention provides a low-earth safety protection method for a thermal diffusion test of a battery pack, which adopts a sinking type battery pack thermal runaway test method; placing the battery pack on a liftable stainless steel structure platform for testing, wherein the stainless steel structure platform is at the highest position during testing and is exposed out of the ground; after the test is finished, the stainless steel structure platform descends until the battery pack is completely immersed in the sunken water tank, so that cooling, fire extinguishing, smoke extinguishing and safety isolation of the battery pack are realized.
Further, the step of placing the battery pack on the liftable stainless steel structure platform for testing is to adopt the integral stainless steel structure platform, install the integral stainless steel structure platform on a lifting mechanism which ensures that the integral stainless steel structure platform can stably lift, and lift the integral stainless steel structure platform to the ground through the lifting mechanism during testing so as to carry out the thermal diffusion test of the battery pack.
Furthermore, the integral stainless steel structure platform adopts a frame structure and comprises a bottom frame, a top frame and a supporting upright post 3, wherein the bottom frame and the top frame are connected through the supporting upright post to form a three-dimensional frame structure; preventing the battery pack from being placed on the bottom frame during testing; the outer side of the top frame connected with the upright post is provided with a lifting rod for lifting the whole frame, and the lifting rod drives the whole frame to lift.
Furthermore, the bottom frame is of a latticed structure, and partition bars or partition blocks for carrying are arranged on the latticed bottom surface so as to facilitate forklift operation; the top frame is a roof beam supporting structure and adopts an isosceles trapezoid structure beam, the supporting upright posts are correspondingly supported at the upper edge end part of the isosceles trapezoid, and the lifting rod is supported at the end part of the lower bottom edge of the isosceles trapezoid.
Furthermore, the stainless steel structure platform is descended, namely the stainless steel structure platform is descended to the ground through the lifting mechanism and falls into a caisson type water pool arranged below the ground; the lifting mechanism is a synchronous spiral lifting mechanism, and all lifting rods driving the stainless steel structure platform to lift are driven by the same motor to realize synchronous operation.
Furthermore, the synchronous spiral lifting mechanism divides the lifting rods into two groups which are respectively arranged at two sides of the pool and connected through synchronous driving shafts, and the synchronous driving shafts respectively drive the lifting rods to lift through the spiral driving mechanism and lift the lifting rods; the driving motor is arranged in the middle of the lifting rod and located on the other side of the water pool, and the driving motor drives the synchronous driving shafts on the two sides through the synchronous chains respectively to realize synchronous driving of the lifting rod on the two sides.
Furthermore, the screw driving mechanism is a turbine pair mechanism; the worm is arranged on the synchronous driving shaft and rotates along with the synchronous driving shaft, and a turbine matched with the worm is arranged in a turbine seat sleeved outside the lifting rod; the turbine seat is fixedly arranged on a lifting mechanism mounting plate at the edge of the water pool plate, the turbine is driven by the worm to rotate in the turbine seat, and the lifting column which is connected with the worm through the screw rod pair is driven to move up and down in the rotation, so that the lifting of the lifting column is formed.
Furthermore, when the lifting rod is at the lowest position, the rod body of the lifting rod is deep into the hole of the lifting column below the ground; a lifting column hole which is larger than the length of the lifting rod body is dug below the turbine seat of the lifting mechanism mounting plate according to the length of the lifting rod body, and when the lifting rod drives the stainless steel structure platform to descend, the lifting rod body extends downwards into the lifting column hole.
Furthermore, the battery pack is completely immersed in the sunken water pool, namely the water pool with a caisson type is arranged below the ground level, the size of the water pool just accommodates the integral stainless steel structure platform, and the battery pack placed on the integral stainless steel structure platform for testing can be completely immersed in the water of the water pool in the lifting process of the integral stainless steel structure platform; the battery pack is placed on the stainless steel structure platform for a battery pack thermal diffusion test after rising to the ground on the integral stainless steel structure platform, and after the test is completed, the integral stainless steel structure platform is driven to descend through the lifting mechanism until the battery pack is completely soaked in water in the water tank.
Furthermore, the periphery and the bottom of the water pool are provided with cement components, and slight explosion and abnormal combustion are resisted through the cement components; meanwhile, the outside of the stainless steel structure platform except the base is wrapped with an insulating protection material, so that the damage of battery leakage to personnel is avoided; an insulation protection device is arranged between the stainless steel structure platform and the spiral elevator, and damage to electromechanical equipment caused by battery leakage is avoided.
The invention has the advantages that:
according to the invention, the battery pack is placed on the liftable test platform frame through the sunken water tank, and after the battery pack test is finished, the battery pack is sunken into the water tank through the lifting of the test platform, so that the cooling, fire extinguishing and smoke extinguishing of the battery pack and safe isolation of the battery pack can be realized more safely.
Drawings
FIG. 1 is a schematic perspective view of an embodiment of the present invention;
FIG. 2 is a schematic front view of the overall structure of the present invention;
FIG. 3 is a schematic top view of the overall structure of the present invention;
FIG. 4 is a side schematic view of the overall structure of the present invention;
FIG. 5 is an enlarged schematic view of a portion of the spiral lift mechanism of the present invention;
FIG. 6 is a schematic perspective view of another embodiment of the present invention;
FIG. 7 is a schematic view of the overall structure of another embodiment of the present invention in a lowered front view;
fig. 8 is a schematic side view of another embodiment of the present invention when the overall structure is sunk.
Detailed Description
The invention is further illustrated with reference to the following figures and specific examples.
Example one
As can be seen from fig. 1-4, the invention relates to a low-ground safety protection device for a battery pack thermal diffusion test, which comprises a bottom frame 1, a top frame 2, a support upright post 3 and a sink type water pool 4, wherein the bottom frame 1 and the top frame 2 are connected through the support upright post 3 to form a three-dimensional battery pack thermal diffusion test frame 16; the sinking type water tank 4 is arranged below the battery pack thermal diffusion test frame and ensures that the battery pack thermal diffusion test frame can sink into the water tank integrally; the outer side of the top frame 2 connected with the supporting upright posts 3 is provided with a lifting mechanism 5 for lifting the whole frame, the battery pack 6 is placed on the bottom frame 1 during the test, and the lifting mechanism 5 is lifted to drive the lifting of the thermal diffusion test frame of the battery pack to sink into the sink type water pool 4 after the test is finished.
The bottom frame 1 is of a grid structure, and partition bars or partitions 7 for carrying are arranged on the grid bottom surface so as to facilitate forklift operation.
The top frame 2 is a roof beam type supporting structure, isosceles trapezoid structural beams are adopted, and the number of the supporting upright columns 3 is 4; the supporting upright posts 3 are correspondingly supported at two end parts of the upper edge 8 of the isosceles trapezoid, and the lifting rods 9 of the lifting mechanism 5 are supported at two end parts of the lower bottom edge 10 of the isosceles trapezoid; the lifting rods 9 are also 4 and are respectively arranged below 4 end points of two end parts of the lower bottom edge 10 of the isosceles trapezoid.
The lifting mechanism 5 is a synchronous spiral lifting mechanism, and all lifting rods 9 are driven by the synchronous spiral lifting mechanism to synchronously lift; the synchronous spiral lifting mechanism is characterized in that all lifting rods 9 connected with the battery pack thermal diffusion test frame are driven by the same driving motor 11 to realize synchronous operation.
The synchronous spiral lifting mechanism divides the lifting rods 9 into two groups which are respectively arranged at two sides of the water pool and are connected through synchronous driving shafts 12, and the synchronous driving shafts 12 respectively drive the lifting rods 9 to lift through spiral driving mechanisms 13 and drive the lifting rods 9 to lift; the driving motor 11 is arranged in the middle of the lifting rod and positioned at the other side of the sunken pool 4, the driving motor 11 drives the two transmission shafts 17 through a transfer case 19, then drives the synchronous driving shafts 12 at the two sides through the bevel gear mechanism 20, and drives the spiral lifting structure through the synchronous shafts 12 to realize the synchronous driving of the lifting rod at the two sides.
The screw driving mechanism 13 is a turbine pair mechanism; the worm 21 is connected with the synchronous driving shaft 12 and rotates along with the synchronous driving shaft 12, and a turbine (not shown in the figure) matched with the worm 21 is arranged in a turbine seat 22 sleeved outside the lifting rod; the turbine seat 22 is fixedly arranged on a lifting mechanism mounting plate at the edge of the water basin, the turbine 22 is driven by the worm 21 to rotate in the turbine seat, and drives a lifting column which is arranged in the turbine and connected by a screw rod pair to move up and down in the rotation, so that the lifting of the lifting column is formed.
When the lifting rod 9 is at the lowest position, the rod body of the lifting rod 9 is deep into the hole 15 of the lifting column below the ground; a lifting column hole 15 which is larger than the length of the rod body of the lifting rod 9 is dug below the turbine seat arranged on the lifting mechanism 5 according to the length of the rod body of the lifting rod 9, and when the lifting rod 9 drives the stainless steel structure platform to descend, the rod body of the lifting rod extends downwards into the lifting column hole 15.
The sink type water pool 4 is a water pool with a caisson type arranged in the land 18 below the ground level, the size of the water pool just accommodates the integral stainless steel structure platform, and the battery pack placed on the integral stainless steel structure platform for testing can be completely immersed in the water of the water pool in the lifting process of the integral stainless steel structure platform; the battery pack is placed on the stainless steel structure platform for a battery pack thermal diffusion test after rising to the ground on the integral stainless steel structure platform, and after the test is completed, the integral stainless steel structure platform is driven to descend through the lifting mechanism until the battery pack is completely soaked in water in the water tank.
The periphery and the bottom of the sink type water pool 4 are provided with cement components, and slight explosion and abnormal combustion are resisted through the cement components.
Meanwhile, the outside of the stainless steel structure platform except the base is coated with an insulating protection material, so that the damage of battery leakage to personnel is avoided; an insulation protection device is arranged between the stainless steel structure platform and the spiral elevator, and damage to electromechanical equipment caused by battery leakage is avoided.
The embodiment is characterized in that: this embodiment adopts 4 lifter of single motor drive, combines through sprocket and spiral elevation structure, realizes synchronous drive and has drive arrangement reliable, easy control, operates steadily reliable characteristics.
Example two
The basic principle of the second embodiment is the same as that of the first embodiment, but the structure is slightly different, as shown in fig. 5-8, the second embodiment is a low ground safety protection device for the thermal diffusion test of the battery pack, and comprises a test frame 201, wherein the battery pack 202 is placed on the test frame 201 for the thermal diffusion test; the test rack 201 is a liftable test rack, the test rack 201 is mounted on a lifting mechanism 203 and lifted along with the lifting of the lifting mechanism 203, a sunken water pool 204 is arranged below the test rack 201 and below a ground plane 205, and the test rack 201 is lifted between the sunken water pool 204 and the ground.
The driving motor 206 drives the synchronous driving shafts on both sides through the synchronous chain, the driving motor 206 drives the synchronous chain wheel 207, the synchronous chain wheel 207 drives the synchronous transmission shaft 208, and the synchronous transmission shaft 208 drives the lifting mechanism 203 to rotate, so that the lifting rods on both sides are driven synchronously.
The above listed embodiments are only for clear and complete description of the technical solution of the present invention with reference to the accompanying drawings; it should be understood that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments, and the terms such as "upper", "lower", "front", "back", "middle", etc. used in this specification are for clarity of description only, and are not intended to limit the scope of the invention, which can be implemented, and the changes or modifications of the relative relationship thereof are also regarded as the scope of the invention without substantial technical changes. Meanwhile, the structures, the proportions, the sizes, and the like shown in the drawings are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the conditions under which the present invention can be implemented, so that the present invention has no technical essence, and any structural modification, changes in proportion relation, or adjustments of the sizes, can still fall within the range covered by the technical contents disclosed in the present invention without affecting the effects and the achievable purposes of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Through the description of the embodiment, it can be known that the invention mainly relates to a low-ground safety protection method for a thermal diffusion test of a battery pack, and a sinking type battery pack thermal runaway test method is adopted; placing the battery pack on a liftable stainless steel structure platform for testing, wherein the stainless steel structure platform is at the highest position during testing and is exposed out of the ground; after the test is finished, the stainless steel structure platform descends until the battery pack is completely immersed in the sunken water tank, so that cooling, fire extinguishing, smoke extinguishing and safety isolation of the battery pack are realized.
The battery pack 1 is placed on a liftable stainless steel structure platform for testing, the integral stainless steel structure platform is adopted, the integral stainless steel structure platform is installed on a lifting mechanism which can ensure that the integral stainless steel structure platform can stably lift, and the integral stainless steel structure platform is lifted to the ground through the lifting mechanism during testing to perform the thermal diffusion test of the battery pack.
The integral stainless steel structure platform adopts a frame structure and consists of a bottom frame, a top frame and a support upright part, wherein the bottom frame and the top frame are connected through the support upright to form a three-dimensional frame structure; preventing the battery pack from being placed on the bottom frame during testing; the outer side of the top frame connected with the upright post is provided with a lifting rod for lifting the whole frame, and the lifting rod drives the whole frame to lift.
The bottom frame is of a latticed structure, and partition bars or partition blocks for carrying are arranged on the latticed bottom surface so as to facilitate forklift operation; the top frame is a roof beam supporting structure and adopts an isosceles trapezoid structure beam, the supporting upright posts are correspondingly supported at the upper edge end part of the isosceles trapezoid, and the lifting rod is supported at the end part of the lower bottom edge of the isosceles trapezoid.
The stainless steel structure platform is descended, namely the stainless steel structure platform is descended to the ground through the lifting mechanism and falls into a caisson type water pool arranged below the ground; the lifting mechanism is a synchronous spiral lifting mechanism, and all lifting rods driving the stainless steel structure platform to lift are driven by the same motor to realize synchronous operation.
The synchronous spiral lifting mechanism divides the lifting rods into two groups which are respectively arranged at two sides of the water pool and connected through a synchronous driving shaft, and the synchronous driving shafts respectively drive the lifting rods to lift through the spiral driving mechanism and lift the lifting rods; the driving motor is arranged in the middle of the lifting rod and located on the other side of the water pool, and the driving motor drives the synchronous driving shafts on the two sides through the synchronous chains respectively to realize synchronous driving of the lifting rod on the two sides.
The spiral driving mechanism is a turbine pair mechanism; the worm is arranged on the synchronous driving shaft and rotates along with the synchronous driving shaft, and a turbine matched with the worm is arranged in a turbine seat sleeved outside the lifting rod; the turbine seat is fixedly arranged on a lifting mechanism mounting plate at the edge of the water pool plate, the turbine is driven by the worm to rotate in the turbine seat, and the lifting column which is connected with the worm through the screw rod pair is driven to move up and down in the rotation, so that the lifting of the lifting column is formed.
When the lifting rod is at the lowest position, the rod body of the lifting rod is deep into a hole of the lifting column below the ground; a lifting column hole which is larger than the length of the lifting rod body is dug below the turbine seat of the lifting mechanism mounting plate according to the length of the lifting rod body, and when the lifting rod drives the stainless steel structure platform to descend, the lifting rod body extends downwards into the lifting column hole.
The battery pack is completely immersed in the sunken water pool, namely the water pool with a caisson type is arranged below the ground level, the size of the water pool just accommodates the integral stainless steel structure platform, and the battery pack placed on the integral stainless steel structure platform for testing can be completely immersed in the water of the water pool in the lifting process of the integral stainless steel structure platform; the battery pack is placed on the stainless steel structure platform for a battery pack thermal diffusion test after rising to the ground on the integral stainless steel structure platform, and after the test is completed, the integral stainless steel structure platform is driven to descend through the lifting mechanism until the battery pack is completely soaked in water in the water tank.
The periphery and the bottom of the water tank are provided with cement components, and slight explosion and abnormal combustion are resisted through the cement components; meanwhile, the outside of the stainless steel structure platform except the base is wrapped with an insulating protection material, so that the damage of battery leakage to personnel is avoided; an insulation protection device is arranged between the stainless steel structure platform and the spiral elevator, and damage to electromechanical equipment caused by battery leakage is avoided.
The invention has the advantages that:
according to the invention, through a sunken water tank, after the battery pack test is finished, the battery pack is sunken into the water tank, so that the cooling, fire extinguishing, smoke extinguishing and safety isolation of the battery pack can be realized more safely. The following advantages are mainly provided:
1. the sinking type water tank is adopted, after the thermal runaway test of the battery pack is finished, the battery pack is lowered into the sinking type water tank for cooling, so that the safety protection of cooling can be effectively carried out, and even if explosion and other fire happen in the test process, the battery pack can be quickly lowered into the water tank for extinguishing fire and extinguishing smoke, so that the effect of safety isolation is achieved;
2. the battery pack is placed on a lifting platform, and is lifted through a lifting mechanism, so that the test and cooling can be separated, the test and cooling can be completed in different areas, and the safety protection performance can be improved;
3. the platform is lifted by adopting a plurality of lifting mechanisms, the lifting mechanisms adopt synchronous spiral lifting mechanisms, all the lifting mechanisms are driven by the same motor through transmission devices such as screw rods, worm wheels and worms, stable lifting actions at different speeds can be realized, the synchronization performance is good, the lifting process is stable and reliable, the synchronization precision is less than or equal to 1mm, the speed is adjustable, the stopping at any position is realized by utilizing the self-locking capacity of a thread machine, and the impact of water flow during water outlet and water inlet can be resisted; the phenomena of clamping stagnation and creeping in the operation process are avoided; the transportation and the taking are convenient, and the platform is lifted after the safety of the tested battery pack is confirmed, so that the battery pack can be transported by a forklift;
4. insulating protective materials are wrapped outside the stainless steel structure platform (except the base), so that the damage of battery leakage to personnel is avoided; an insulation protection device is arranged between the stainless steel structure platform and the spiral elevator, so that the damage of battery leakage to electromechanical equipment is avoided;
5. the periphery and the bottom of the water tank are provided with cement components which can resist slight explosion and abnormal combustion; the city water is used for realizing cooling, smoke suppression, fire extinguishment, explosion prevention and isolation of dangerous sources for the battery pack;
6. the lifting platform is lower than the ground of the laboratory and is hidden under the ground, so that the space utilization rate is high, and the equipment is effectively protected; a cover plate is laid above the lifting platform, so that people can walk together conveniently, and people are prevented from falling, collision and mechanical injury (rolling injury of rotating equipment and flying injury of fasteners and parts);
7. the stainless steel structural platform adopts an integral frame structure, so that the sufficient bearing capacity is ensured, and the two sides are open without shielding, so that the tested battery pack is convenient to transfer; and the stainless steel structure platform adopts the U-shaped design, and is raised with elevating gear's strong point, guarantees that the battery submerges in the pond of below ground completely.
And a mechanical/electrical stop protection device is arranged at the limit position to limit the operation of the equipment.
Claims (10)
1. A low-earth safety protection method for a battery pack thermal diffusion test is characterized by comprising the following steps: a sinking type battery pack thermal runaway testing method is adopted; placing the battery pack on a liftable stainless steel structure platform for testing, wherein the stainless steel structure platform is at the highest position during testing and is exposed out of the ground; after the test is finished, the stainless steel structure platform descends until the battery pack is completely immersed in the sunken water tank, so that cooling, fire extinguishing, smoke extinguishing and safety isolation of the battery pack are realized.
2. The method of claim 1 for fail-safe protection of a heat diffusion test for a battery pack, wherein: the battery pack is placed on the liftable stainless steel structure platform for testing, the integral stainless steel structure platform is adopted, the integral stainless steel structure platform is installed on a lifting mechanism which can ensure that the integral stainless steel structure platform can stably lift, and the integral stainless steel structure platform is lifted to the ground through the lifting mechanism during testing to perform the thermal diffusion test of the battery pack.
3. The method of claim 2 for fail-safe protection of a heat diffusion test of a battery pack, wherein: the integral stainless steel structure platform adopts a frame structure and comprises a bottom frame, a top frame and a supporting upright post 3 part, wherein the bottom frame and the top frame are connected through the supporting upright post to form a three-dimensional frame structure; preventing the battery pack from being placed on the bottom frame during testing; the outer side of the top frame connected with the upright post is provided with a lifting rod for lifting the whole frame, and the lifting rod drives the whole frame to lift.
4. The method of claim 3 for fail-safe protection of a heat diffusion test of a battery pack, wherein: the bottom frame is of a latticed structure, and partition bars or partition blocks for carrying are arranged on the latticed bottom surface so as to facilitate forklift operation; the top frame is a roof beam supporting structure and adopts an isosceles trapezoid structure beam, the supporting upright posts are correspondingly supported at the upper edge end part of the isosceles trapezoid, and the lifting rod is supported at the end part of the lower bottom edge of the isosceles trapezoid.
5. The method of claim 1 for fail-safe protection of a heat diffusion test for a battery pack, wherein: the stainless steel structure platform is descended, namely the stainless steel structure platform is descended to the ground through the lifting mechanism and falls into a caisson type water pool arranged below the ground; the lifting mechanism is a synchronous spiral lifting mechanism, and all lifting rods driving the stainless steel structure platform to lift are driven by the same motor to realize synchronous operation.
6. The method of claim 5 for fail-safe protection in a heat diffusion test of a battery pack, wherein: the synchronous spiral lifting mechanism divides the lifting rods into two groups which are respectively arranged at two sides of the water pool and connected through synchronous driving shafts, and the synchronous driving shafts respectively drive the lifting rods to lift through the spiral driving mechanism and lift the lifting rods; the driving motor is arranged in the middle of the lifting rod and located on the other side of the water pool, and the driving motor drives the synchronous driving shafts on the two sides through the synchronous chains respectively to realize synchronous driving of the lifting rod on the two sides.
7. The method of claim 6 for fail-safe protection in a heat diffusion test of a battery pack, wherein: the spiral driving mechanism is a turbine pair mechanism; the worm is arranged on the synchronous driving shaft and rotates along with the synchronous driving shaft, and a turbine matched with the worm is arranged in a turbine seat sleeved outside the lifting rod; the turbine seat is fixedly arranged on a lifting mechanism mounting plate at the edge of the water pool plate, the turbine is driven by the worm to rotate in the turbine seat, and the lifting column which is connected with the worm through the screw rod pair is driven to move up and down in the rotation, so that the lifting of the lifting column is formed.
8. The method of claim 6 for fail-safe protection in a heat diffusion test of a battery pack, wherein: when the lifting rod is at the lowest position, the rod body of the lifting rod is deep into a hole of the lifting column below the ground; a lifting column hole which is larger than the length of the lifting rod body is dug below the turbine seat of the lifting mechanism mounting plate according to the length of the lifting rod body, and when the lifting rod drives the stainless steel structure platform to descend, the lifting rod body extends downwards into the lifting column hole.
9. The method of claim 1 for fail-safe protection of a heat diffusion test for a battery pack, wherein: the battery pack is completely immersed in the sunken water pool, namely the water pool with a caisson type is arranged below the ground level, the size of the water pool just accommodates the integral stainless steel structure platform, and the battery pack placed on the integral stainless steel structure platform for testing can be completely immersed in the water of the water pool in the lifting process of the integral stainless steel structure platform; the battery pack is placed on the stainless steel structure platform for a battery pack thermal diffusion test after rising to the ground on the integral stainless steel structure platform, and after the test is completed, the integral stainless steel structure platform is driven to descend through the lifting mechanism until the battery pack is completely soaked in water in the water tank.
10. The method of claim 9 for fail-safe protection in a heat diffusion test of a battery pack, wherein: the periphery and the bottom of the water tank are provided with cement components, and slight explosion and abnormal combustion are resisted through the cement components; meanwhile, the outside of the stainless steel structure platform except the base is wrapped with an insulating protection material, so that the damage of battery leakage to personnel is avoided; an insulation protection device is arranged between the stainless steel structure platform and the spiral elevator, and damage to electromechanical equipment caused by battery leakage is avoided.
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Address after: No.6 Shangjian Road, Tianyuan District, Zhuzhou City, Hunan Province, 412007 Applicant after: Hunan motor vehicle testing technology Co.,Ltd. Address before: Building E-3, phase 3.1, Xinma power innovation park, 899 Xianyue Ring Road, Tianyuan District, Zhuzhou City, Hunan Province, 412007 Applicant before: Hunan motor vehicle testing technology Co.,Ltd. |
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