CN114788938B - Quick response type power battery fire extinguishing device - Google Patents
Quick response type power battery fire extinguishing device Download PDFInfo
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- CN114788938B CN114788938B CN202210332062.7A CN202210332062A CN114788938B CN 114788938 B CN114788938 B CN 114788938B CN 202210332062 A CN202210332062 A CN 202210332062A CN 114788938 B CN114788938 B CN 114788938B
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- capsule
- fire suppression
- power battery
- fire
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/02—Permanently-installed equipment with containers for delivering the extinguishing substance
- A62C35/10—Containers destroyed or opened by flames or heat
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/42—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with mechanical connection between sensor and actuator, e.g. rods, levers
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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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
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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
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- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The invention relates to a quick response type power battery fire extinguishing device, which comprises a protective cover; a sealing connection mechanism; keep apart a plurality of apothecas through a plurality of vertical baffles that distribute along the left and right directions in the protection casing, be equipped with in the apotheca along a plurality of conflagration suppression capsule subassemblies that the direction distributes from top to bottom, conflagration suppression capsule subassembly is including deciding the extrusion strip, one row of conflagration suppression capsule row, drive sharp ware when breaking the conflagration suppression capsule and temperature rise and arrange the actuating mechanism that removes towards conflagration suppression capsule, it only can store the front and back capsule storage channel that a row of conflagration suppression capsule was arranged to form between extrusion strip and the sharp ware to the capsule, the conflagration suppression capsule is arranged in the capsule storage channel to the front and back direction. The invention provides a quick response type power battery fire extinguishing device which is timely in response and can be conveniently used for extinguishing fire of the existing power battery, and the quick response type power battery fire extinguishing device is used for replacing the existing power battery self-extinguishing mode added with a fire retardant so as to improve the reliability of the power battery during self-extinguishing.
Description
Technical Field
The invention relates to the field of power batteries, in particular to a quick response type power battery fire extinguishing device.
Background
With the wide application of storage batteries in the fields of electric bicycles, energy storage, electric automobiles and the like, related fire and explosion accidents frequently occur, so that the life safety and property safety of users are seriously threatened, and the batteries used on vehicles are called power batteries.
The existing measure for improving the safety of the power battery is to add a flame retardant into an electrolyte. However, the measure has more limitations, namely, in order to not affect the performance of the ion battery, too much flame retardant cannot be added, and the flame retardant effect is general; and secondly, the flame retardant can not inhibit the thermal runaway gas production reaction. Therefore, it is urgently needed to have a fire extinguishing device or a power battery capable of automatically extinguishing the fire of the power battery.
Disclosure of Invention
The invention provides a quick response type power battery fire extinguishing device which can respond in time and can be conveniently used for extinguishing the fire of the existing power battery, and the quick response type power battery fire extinguishing device is used for replacing the existing power battery self-extinguishing mode added with a fire retardant so as to improve the reliability of the power battery during self-extinguishing.
The technical problem is solved by the following technical scheme: a quick response type fire extinguishing device for a power battery comprises a battery shell, a battery body and two electrodes, wherein the battery body is positioned in the battery shell, one end of each electrode is positioned outside the electronic shell and is electrically connected with the electronic body; the sealing connection mechanism is used for connecting the protective cover and the battery shell together in a sealing way when the fireproof cover is sleeved on the battery shell; the fire suppression capsule row is characterized in that a plurality of vertical partition plates distributed in the left-right direction are arranged in the protective cover, a plurality of storage chambers distributed in the left-right direction are isolated by the vertical partition plates in the protective cover, a plurality of fire suppression capsule assemblies distributed in the up-down direction are arranged in the storage chambers, each fire suppression capsule assembly comprises a fixed extrusion strip, a row of fire suppression capsule rows, an edge tool for breaking all fire suppression capsules in the fire suppression capsule rows and a driving mechanism for driving the edge tool to move towards the fire suppression capsule rows when the temperature is increased, the fixed extrusion strips and the edge tool are distributed on two sides of the fire suppression capsule rows, a forward and backward capsule storage channel capable of storing only one row of fire suppression capsule rows is formed between the fixed extrusion strips and the edge tool, and the fire suppression capsules in the fire suppression capsule rows are arranged in the forward and backward direction in the forward and backward capsule storage channel; a fire extinguishing agent outflow space is provided between the fire suppression capsule assembly and the side wall of the storage chamber. When the protective cover is used, the protective cover is sleeved on the battery shell, and the two electrodes pass through the electrode through holes to be exposed, so that wiring is facilitated. And then the sealing connecting mechanism protective cover and the battery shell are connected together in a sealing way through the sealing connecting mechanism to form a sealing cavity. When the temperature rises due to fire, the fire suppression capsule is heated and cracked, and the driving mechanism also drives the sharp tool to crack the fire suppression capsule, so that the reliability of the fire suppression capsule in cracking is improved.
Preferably, the sharps are knife strips with cutting edges facing fire suppression capsules in the fire suppression capsule row.
Preferably, the fire suppression capsule is provided with a capsule portion annular groove extending along the circumferential direction of the fire suppression capsule on the outer surface thereof, and the cutting edge is aligned with the capsule portion annular groove. The reliability of the capsule during fire suppression can be realized by lifting the cutter bar and cutting the slope.
Preferably, the thickness of the annular groove of the capsule portion is smaller than the thickness of the fire suppression capsule casing on both sides of the annular groove of the capsule portion. The reliability of breaking the fire suppression capsule can be further improved.
Preferably, the cutting edge is inserted into the annular groove of the capsule portion, and the blade is located below the fire suppression capsule group. The fire suppression capsule can be prevented from being displaced.
As another preference, the sharps are root needles aligned in one-to-one correspondence with fire suppression capsules in the fire suppression capsule bank. The force required to puncture the fire suppression capsule is small. The response sensitivity is improved.
Preferably, the fire suppression capsule assembly further comprises a support strip, the fixed pressing strip is located above the fire suppression capsule group, the fire suppression capsules in the fire suppression capsule row are flatly laid on the support strip, the needle point of the needle faces upwards, and the whole needle is located below the upper surface of the support strip. It is possible to prevent the occurrence of erroneous operation. The fire suppression capsule is positioned above the needle of the sharp weapon, so that the fire suppression capsule can be prevented from being punctured by the needle by mistake when the driving mechanism loses the fixing effect on the needle.
Preferably, the needle comprises a cylindrical body, the needle tip is coaxially connected to the cylindrical body, the cylindrical body is slidably arranged in a sliding hole in the supporting strip in a penetrating mode, and the cylindrical body and the sliding hole abut together. When the diameter of the needle is small, the needle can be prevented from bending in the process of puncturing the fire suppression capsule, and the reliability of the fire suppression capsule during breakage is poor.
Preferably, the driving mechanism comprises a fixed connecting block provided with a sealed air cavity, the fixed connecting block is provided with a plurality of air holes for communicating the sealed air cavity with the outside of the fixed connecting block, a driving rod is connected in the air holes in a sliding and sealing mode, and the edge tool is connected with the driving rod. The volume of the sealed air cavity is larger, and the sensitivity to temperature response is improved.
Preferably, the fixed connecting blocks of one fire suppression capsule assembly are connected with the fixed pressing strips of the other fire suppression capsule assembly. The number of fire suppression capsules that can be installed in the protective cover can be maximized. The fire extinguishing capability is improved.
Preferably, the fixed extrusion strips are located above the fire suppression capsule rows and are obliquely arranged along the front-back direction, a mirror layer is arranged on the lower surface of each fixed extrusion strip, the oblique directions of the fixed extrusion strips in the adjacent fire suppression capsule assemblies are opposite, only one end of each front-back capsule storage channel in each two adjacent fire suppression capsule assemblies is communicated through a vertical capsule channel, the adjacent vertical capsule channels are located at two ends of each front-back capsule storage channel, a capsule input hole is formed in the lower end of each front-back capsule storage channel in the lowest fire suppression capsule assembly, and the capsule input holes are detachably connected with plugs. During manufacturing, the opening end of the protective cover is kept upward, and then the fire suppression capsules are filled in through the capsule input holes, so that the fire suppression capsules can be conveniently filled in all the front and back capsule storage channels. The convenience in manufacturing is good. After fire occurs, the capsule input hole is opened to exhaust air, so that the capsule input hole can play a role in storing the capsule in a forward and backward direction, and the dual-purpose function of one object is achieved.
The invention has the following advantages: the fire suppression capsule is used for extinguishing fire, so that the fire suppression reliability is good; the fire suppression capsule is not subjected to thermal explosion, so that the fire suppression capsule can be broken by a sharp tool when the temperature rises, the reliability of the fire suppression capsule during breakage is improved, and the problem that the capsule cannot be broken and respond in time due to the fact that the capsule wall thickness is ultrathin is solved; can be conveniently installed on the existing lithium ion battery to protect fire.
Drawings
FIG. 1 is a schematic longitudinal sectional view of a first embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic enlarged view of a portion of FIG. 2 at B;
FIG. 4 is a cross-sectional view of a first embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a second embodiment of the present invention;
fig. 6 is a partially enlarged schematic view at C of fig. 5.
In the figure: the fire-extinguishing capsule comprises a battery shell 1, a battery body 2, electrodes 3, a protective cover 4, electrode through holes 5, a sealing connection mechanism 6, a vertical partition plate 7, a fixed extrusion strip 8, a sharp tool 9, a driving mechanism 10, a front-back capsule storage channel 11, a fire-extinguishing capsule 12, a cutting edge 13, a capsule part annular groove 14, a sealing air cavity 15, a fixed connection block 16, a driving rod 17, a sliding block 18, a vertical capsule channel 19, a capsule input hole 20, a plug 21, a supporting strip 22, a needle point 23, a cylindrical body 24, a sliding hole 25, a fire-extinguishing capsule assembly 26, a connection strip 27 and a fire-extinguishing agent outflow space 33.
Detailed Description
The invention is further described with reference to the following figures and examples.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
First embodiment, referring to fig. 1 and 4, a quick response type fire extinguishing device for a power battery comprises a battery shell 1, a battery body 2 located in the battery shell, and two electrodes 3 with one ends located outside the electronic shell and electrically connected with the electronic body. The invention comprises a protective cover 4 which is used for covering a battery shell and is provided with two electrode through holes 5 for two electrodes to pass through; and the sealing connection mechanism 6 is used for connecting the protective cover and the battery shell together in a sealing way when the fireproof cover is sleeved on the battery shell, is connected with the inflatable sealing ring in a sealing way, and is naturally glued together by glue to form an adhesive tape to form the sealing connection mechanism for sealing. Be equipped with in the protection casing along a plurality of vertical baffles 7 that left right direction distributes, erect the baffle and keep apart out a plurality of apothecas that distribute along left right direction in the protection casing, be equipped with in the apotheca along a plurality of conflagration suppression capsule subassemblies 26 that upper and lower direction distributes, be equipped with fire extinguishing agent outflow space 33 between the lateral wall of conflagration suppression capsule subassembly and apotheca, be equipped with 4 conflagration suppression capsule subassemblies in the medical cabinet apotheca in this embodiment. The fire suppression capsule assembly comprises a fixed extrusion strip 8 (the fixed extrusion strip of the uppermost fire suppression capsule assembly is integrated with the top wall of the protective cover), a row of fire suppression capsule rows, sharp tools 9 for breaking all fire suppression capsules in the fire suppression capsule rows and a driving mechanism 10 for driving the sharp tools to move towards the fire suppression capsule rows when the temperature rises, the fixed extrusion strip and the sharp tools are distributed at two sides (specifically, the upper side and the lower side, and the sharp tools are positioned below the fixed extrusion strip) of the fire suppression capsule rows, a front-back capsule storage channel 11 capable of storing only one row of fire suppression capsule rows is formed between the fixed extrusion strip and the sharp tools, and fire suppression capsules 12 in the fire suppression capsule rows are arranged in the front-back capsule storage channel along the front-back direction. The sharp edge is a knife strip with a cutting edge 13 facing the fire suppression capsules in the fire suppression capsule row. The outer surface of the fire suppression capsule is provided with a capsule part annular groove 14 extending along the circumferential direction of the fire suppression capsule, and the cutting edge is aligned with the capsule part annular groove. The cutting edge is arranged in the annular groove of the capsule part in a penetrating way, and the knife strip is positioned below the fire suppression capsule group.
The driving mechanism comprises a stationary connecting block 16 provided with a sealed air chamber 15. The fixed connecting block is provided with a plurality of air holes which communicate the sealed air cavity with the outside of the fixed connecting block, and the air holes are connected with a driving rod 17 in a sliding and sealing manner, and particularly the driving rod is connected with the air holes in a sliding and sealing manner through a sliding block 18. The sharp tool is connected with the driving rod. The fixed connecting blocks of one fire suppression capsule component are connected with the fixed pressing strips of the other fire suppression capsule component. Decide the extrusion strip and be located the top that the capsule was arranged and set up along the fore-and-aft direction slope of conflagration suppression, be equipped with the mirror layer on deciding the lower surface of extrusion strip, adjacent conflagration suppresses the slope opposite direction of the strip of extrusion of deciding among the capsule subassembly, only one end is stored to the capsule and is passed through vertical capsule passageway 19 intercommunication around two adjacent conflagrations suppress among the capsule subassembly, adjacent vertical capsule passageway is located the both ends of storing the passageway to the capsule from beginning to end, the conflagration that the below is suppressed in the capsule subassembly is equipped with capsule input hole 20 to the low side that the passageway was stored to the capsule from beginning to end, the capsule input hole can be dismantled and be connected with end cap 21.
The second embodiment is different from the first embodiment in that:
referring to fig. 5 and 6, sharps are root needles aligned in one-to-one correspondence with fire suppression capsules in the fire suppression capsule bank. The fire suppression capsule assembly further comprises a support strip 22, fire suppression capsules in the fire suppression capsule row are flatly laid on the support strip, the needle point 23 of the needle faces upwards, and the needle is wholly located below the upper surface of the support strip. The needle comprises a cylindrical body 24, the needle tip of which is coaxially connected to the cylindrical body, the cylindrical body is slidably arranged in a sliding hole 25 on the supporting strip in a penetrating way, and the cylindrical body and the sliding hole are abutted together. All the cylindrical bodies are connected to the connecting bar 27 and all the driving rods are connected to the connecting bar.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A quick response type fire extinguishing device for a power battery comprises a battery shell, a battery body and two electrodes, wherein the battery body is positioned in the battery shell, one end of each electrode is positioned outside the electronic shell and is electrically connected with the electronic body; the sealing connection mechanism is used for sealing and connecting the protective cover and the battery shell together when the fireproof cover is sleeved on the battery shell; the fire suppression capsule row is characterized in that a plurality of vertical partition plates distributed in the left-right direction are arranged in the protective cover, a plurality of storage chambers distributed in the left-right direction are isolated by the vertical partition plates in the protective cover, a plurality of fire suppression capsule assemblies distributed in the up-down direction are arranged in the storage chambers, each fire suppression capsule assembly comprises a fixed extrusion strip, a row of fire suppression capsule rows, an edge tool for breaking all fire suppression capsules in the fire suppression capsule rows and a driving mechanism for driving the edge tool to move towards the fire suppression capsule rows when the temperature is increased, the fixed extrusion strips and the edge tool are distributed on two sides of the fire suppression capsule rows, a forward and backward capsule storage channel capable of storing only one row of fire suppression capsule rows is formed between the fixed extrusion strips and the edge tool, and the fire suppression capsules in the fire suppression capsule rows are arranged in the forward and backward direction in the forward and backward capsule storage channel; be equipped with fire extinguishing agent outflow space between the lateral wall of conflagration suppression capsule subassembly and apotheca, decide the extrusion strip and be located the top that the conflagration suppressed the capsule row and set up along the fore-and-aft direction slope, be equipped with the mirror layer on deciding the lower surface of extrusion strip, the slope opposite direction of deciding the extrusion strip among the adjacent conflagration suppression capsule subassembly, only one end is stored to the capsule and is passed through vertical capsule passageway intercommunication around two adjacent conflagrations suppression capsule subassemblies, adjacent vertical capsule passageway is located the both ends of storing the passageway to the capsule around, the conflagration suppression capsule subassembly of below is equipped with the capsule input hole to the low side that the passageway was stored to the capsule around, the capsule input hole can be dismantled and be connected with the end cap.
2. The quick response power battery fire suppression device of claim 1, wherein the sharps are knife strips with cutting edges facing fire suppression capsules in the fire suppression capsule bank.
3. The quick response power battery fire suppression device of claim 2, wherein the fire suppression capsule has an outer surface with a capsule portion annular groove extending circumferentially along the fire suppression capsule, and the cutting edge is aligned with the capsule portion annular groove.
4. The quick response type power battery fire extinguishing device according to claim 3, wherein the cutting edge penetrates through the annular groove of the capsule portion, and the knife strip is located below the fire suppression capsule group.
5. The quick response power cell fire suppression apparatus of claim 1, wherein the sharps are root needles aligned in a one-to-one correspondence with fire suppression capsules in the fire suppression capsule bank.
6. The quick-response power battery fire extinguishing device according to claim 5, wherein the fire suppression capsule assembly further comprises a supporting strip, the fixed extrusion strip is located above the fire suppression capsule group, fire suppression capsules in the fire suppression capsule row are flatly laid on the supporting strip, the needle point of the needle faces upwards, and the whole needle is located below the upper surface of the supporting strip.
7. The quick response power battery fire suppression device of claim 6, wherein the needle comprises a cylindrical body, the needle tip is coaxially connected to the cylindrical body, the cylindrical body is slidably inserted into a slide hole on a support strip, and the cylindrical body and the slide hole abut together.
8. The quick response type power battery fire extinguishing device according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the driving mechanism comprises a fixed connecting block provided with a sealed air cavity, the fixed connecting block is provided with a plurality of air holes for communicating the sealed air cavity with the outside of the fixed connecting block, a driving rod is connected in the air holes in a sliding and sealing manner, and the sharps are connected with the driving rod.
9. The quick response power battery fire suppression device of claim 8, wherein the fixed connection blocks of one fire suppression capsule assembly are connected with the fixed compression strips of another fire suppression capsule assembly adjacent to the fire suppression capsule assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210332062.7A CN114788938B (en) | 2022-03-31 | 2022-03-31 | Quick response type power battery fire extinguishing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210332062.7A CN114788938B (en) | 2022-03-31 | 2022-03-31 | Quick response type power battery fire extinguishing device |
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| Publication Number | Publication Date |
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| CN114788938A CN114788938A (en) | 2022-07-26 |
| CN114788938B true CN114788938B (en) | 2023-01-06 |
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| CN202210332062.7A Active CN114788938B (en) | 2022-03-31 | 2022-03-31 | Quick response type power battery fire extinguishing device |
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| CN113224439A (en) * | 2021-03-31 | 2021-08-06 | 黄丽英 | Hot-pressing flame-retardant power protection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20130132500A (en) * | 2010-12-27 | 2013-12-04 | 볼보 컨스트럭션 이큅먼트 에이비 | Battery cover provided with fire extinguishing function |
| JP6662324B2 (en) * | 2017-02-17 | 2020-03-11 | トヨタ自動車株式会社 | Battery pack |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108635783A (en) * | 2018-05-09 | 2018-10-12 | 葛志生 | A kind of ball cleaning device of continous way |
| CN209900528U (en) * | 2019-03-27 | 2020-01-07 | 宜昌及安盾消防科技有限公司 | Fire protection device |
| CN209933882U (en) * | 2019-04-24 | 2020-01-14 | 陕西坚瑞消防安全设备有限公司 | Non-pressure storage type automatic fire extinguishing device for battery box of new energy lithium battery car |
| CN112448071A (en) * | 2019-09-03 | 2021-03-05 | 飞尔金株式会社 | Capsule type fire extinguishing device for preventing battery explosion and battery with capsule type fire extinguishing device |
| CN211456300U (en) * | 2020-03-27 | 2020-09-08 | 唐山博宇电子有限公司 | Galvanized sheet high-low voltage power distribution cabinet of environmental protection spraying plastics |
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| CN113224439A (en) * | 2021-03-31 | 2021-08-06 | 黄丽英 | Hot-pressing flame-retardant power protection system |
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| CN114788938A (en) | 2022-07-26 |
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