CN211980445U - Super capacitor and terminal equipment - Google Patents
Super capacitor and terminal equipment Download PDFInfo
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- CN211980445U CN211980445U CN202020744460.6U CN202020744460U CN211980445U CN 211980445 U CN211980445 U CN 211980445U CN 202020744460 U CN202020744460 U CN 202020744460U CN 211980445 U CN211980445 U CN 211980445U
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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
- Y02E60/13—Energy storage using capacitors
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Abstract
The utility model discloses a super capacitor and terminal equipment. The utility model provides a supercapacitor includes uncovered type metal casing and supercapacitor body, supercapacitor body arranges in metal casing's the intracavity that holds, supercapacitor body's terminal surface with metal casing's opening end encapsulating forms the sealing layer, metal casing's opening end one side with be provided with the slot rolling between the supercapacitor body to the glue solution flows to the bottom and plugs up when avoiding the encapsulating explosion-proof valve of supercapacitor body. The utility model discloses a metal casing and rolling groove combine together, and both synergism can not come unstuck and lead to the fact the weeping problem because of ageing embrittlement with thoroughly solving ultracapacitor system product weeping problem and glue solution cover explosion-proof valve problem to and explosion-proof valve can't normally be opened and cause to leak out the core device that directly strikes continuous circuit board or other devices damage terminal equipment promptly from the head and send its unable problem of using, guarantee durability, stability and security.
Description
Technical Field
The utility model relates to a ultracapacitor system technical field especially has related to a ultracapacitor system and has adopted this ultracapacitor system's terminal equipment.
Background
The super capacitor is used as an energy storage component and is widely applied to the fields of intelligent three-meter, power carrier, starting, wind energy and solar energy and the like. The super capacitor has the advantages of high power, long service life and no maintenance, is often used in harsh environments such as high altitude, underground, mountainous areas, low temperature and the like, and has strict requirements on the safety and durability of the super capacitor in order to reduce the maintenance or replacement frequency. However, some electrolyte applied to the super capacitor has extremely high requirement on the sealing performance of external packaging due to low viscosity and strong permeability, and the super capacitor often has some inherent defects during packaging, so that certain hidden trouble is left for the permeation of the electrolyte, the electrolyte is easy to permeate from a sealing part, and the electrical performance and the service life of the super capacitor are seriously influenced by leakage. The problem of leakage of the super capacitor is an industrial problem.
In the prior art, the conventional method for improving the sealing performance is a mechanical sealing mode, namely, gaps are reduced by designing the size in a tight fit mode, the sealing effect is enhanced, for example, tight contact is kept between an aluminum shell and a rubber cover and between the rubber cover and a guide pin as far as possible, but the mechanical sealing mode can generate small gaps due to small deviation or impurities in the sealing process, electrolyte with high permeability can still seep out, and the problem of liquid leakage of a product cannot be thoroughly solved.
The other method is to coat glue solution at the sealing part to avoid the seepage of trace electrolyte, usually glue solution water is adopted for dispensing at the sealing interface, and after leveling, UV curing is carried out. The glue is sealed in a dispensing mode, the place covered by the glue can prevent seepage, but the full coverage of the glue on the sealing interface is difficult to control. The surface of a rubber cover and a sealing edge of a super capacitor body are usually uneven, the sealing position is shallow, and the super capacitor is easy to overflow due to too much glue dripping; too little glue may not cover glue at some points during leveling. Furthermore, UV curing is usually a few seconds, the glue is too thin to cure; the gum was too thick and cured too quickly to level. Therefore, the dispensing process is required to be accurate and stable, and the full coverage of the sealing edge by the glue surface can be realized, so that the dispensing mode still has the risk of liquid leakage.
The other method is to adopt a plastic shell glue filling mode, namely, the super capacitor body is placed in the plastic shell firstly, then epoxy resin is filled in the glue filling mode, and then the whole super capacitor body is packaged in the plastic shell after curing, so that the electrolyte cannot seep out. At present, a plastic shell glue-pouring product is mainly used for a module with two series-connected supercapacitors and is used in a high-humidity environment. The plastic shell glue filling mode is adopted, the requirement on process accuracy is lower than that of a glue dispensing mode, the sealing effect can be better guaranteed than that of the glue dispensing mode, however, the plastic is easy to age, the adhesiveness between the aged plastic shell and the epoxy glue is poor, the plastic shell has the risk of falling off, and the plastic shell cannot play a role in protection after being aged and cracked. Moreover, the glue solution can flow to body bottom cover explosion-proof valve and influence its normal opening when the plastic casing encapsulating, because be difficult to ensure the bottom roughness when preparation plastic casing drawing of patterns, also can be in the plastic casing printing explosion-proof line sometimes, also can have the difference in height between two monomers in the module of encapsulation, has the gap between product and the plastic casing bottom for the glue solution can flow ultracapacitor system body bottom cover explosion-proof valve. If the super capacitor body is abnormal and the internal air pressure is too high, the explosion-proof valve cannot be normally opened, but is opened from the head or exploded from the middle, peripheral devices can be affected.
Therefore, the existing glue pouring method for the liquid leakage prevention plastic shell of the super capacitor has the following defects: (1) the problem that glue flows to the bottom of the super capacitor body to cover the explosion-proof valve cannot be solved, and great potential safety hazard and instability exist;
(2) when a super capacitor product needs to be subjected to a high-temperature high-humidity load life test, when the test life reaches 1500 hours, the plastic shell is aged and becomes brittle, so that a defective product or a good product without obvious aging and embrittlement also has a large potential safety hazard in actual use;
(3) in the glue solution curing process, the outer surface is cured faster, the inner glue is cured slower, if air exists in the glue solution, the glue solution is difficult to discharge, and air holes are formed and left in the curing glue. Generally, the visible curing glue (i.e. the curing glue on the outer surface) on the end face of the supercapacitor body can ensure that no air holes are generated, but the air holes are probably formed in the internal curing glue between the plastic shell and the supercapacitor body. If the glue and the plastic shell can be tightly adhered in the service cycle, even if air holes are formed in the glue and the plastic shell, the electrolyte cannot leak out. However, the plastic shell has the defect of easy aging and brittleness, so that the plastic shell is easy to degum, namely, the super capacitor body loses the protection of the plastic shell, the leakage risk is increased, and at the moment, the leakage can overflow through the conducted air hole to affect a circuit board or other devices connected with the leakage, thereby causing great potential safety hazard to terminal equipment. If the internal curing adhesive covers the explosion-proof valve, the risk potential can be further increased, and the electrolyte is discharged from the head (one side of the end face of the super capacitor body) through the air hole and directly impacts a connected circuit board or other devices because the super capacitor is abnormal and the explosion-proof valve cannot be opened due to overlarge internal pressure, so that the core devices of the terminal equipment are easily influenced and cannot be used.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem of the above-mentioned prior art, the utility model provides a super capacitor, the utility model discloses a metal casing and rolling slot combine together, both synergism are in order to thoroughly solve super capacitor product weeping problem and glue solution cover explosion-proof valve problem, the utility model discloses super capacitor can not come unstuck because of the ageing embrittlement of shell causes the weeping problem to and explosion-proof valve can't normally be opened and cause to let out direct impact to continuous circuit board or other devices from the head and damage terminal equipment's core device promptly and send its unable problem of using easily to and even super capacitor appears unusually also can normally open explosion-proof valve and do not influence other circuit boards or devices in the life cycle, guarantees the durability of super capacitor product, stability and security.
The utility model also provides a terminal equipment.
The utility model discloses the technical problem that will solve realizes through following technical scheme:
the utility model provides a super capacitor, its includes open-mouth type metal casing and super capacitor body, the super capacitor body is arranged in metal casing's the intracavity that holds, the terminal surface of super capacitor body with metal casing's open-end encapsulating forms the sealing layer, metal casing's open-end one side with be provided with the rolling groove between the super capacitor body to the glue solution flows to the bottom and plugs up when avoiding the encapsulating explosion-proof valve of super capacitor body.
As the utility model provides a super capacitor's an implementation improvement mode, the rolling slot is for passing through metal casing carries out the roll extrusion processing in open end one side and forms.
As the utility model provides an implementation improvement mode of ultracapacitor system, the rolling groove and metal casing integrated into one piece.
As the utility model provides a super capacitor's an implementation improvement mode, the rolling slot with the beam waist groove of super capacitor body corresponds.
As the utility model provides an implementation improvement mode of ultracapacitor system, the rolling slot is located the upside in restraint waist groove of ultracapacitor system body.
As the utility model provides an implementation improvement mode of ultracapacitor system, the rolling slot is located the downside in restraint waist groove of ultracapacitor system body.
As the utility model provides an implementation improvement mode of ultracapacitor system, the ultracapacitor system body is monomer ultracapacitor system, binary ultracapacitor system or multibody ultracapacitor system.
As an implementation improvement mode of the supercapacitor provided in the present invention, the metal casing is made of any one of aluminum and its alloy, stainless steel, copper and its alloy.
A terminal device comprising any of the above supercapacitors.
As the utility model provides a terminal equipment's an implementation improvement mode, terminal equipment is at least one of intelligence three meters, vehicle event data recorder, energy recuperation system, start power, backup power.
The glue solution can be epoxy glue, acrylic glue, organic silicon glue, UV glue and the like.
The utility model discloses following beneficial effect has:
(1) the utility model discloses a metal casing and rolling groove combine together, both synergism are in order thoroughly to solve ultracapacitor system product weeping problem and glue solution cover explosion-proof valve problem, the utility model discloses ultracapacitor system can not come unstuck because of the ageing embrittlement of shell causes the weeping problem to and do not have the explosion-proof valve and can't normally open and cause to let out the core device that directly strikes continuous circuit board or other devices damage terminal equipment promptly from the head and send its unable problem of using, even ultracapacitor system appears unusually also can normally open the explosion-proof valve and not influence other circuit boards or devices in the life cycle, guarantee the durability of ultracapacitor system product, stability and security.
(2) The metal shell has better adhesion with glue solution, basically does not come unstuck, ensures long-term tightness, can only seal the head part of the sealing layer after glue pouring and curing by additionally arranging the rolling groove, not only has less glue consumption, but also can not flow to the bottom of the super capacitor body to seal the explosion-proof valve, namely, the normal opening of the explosion-proof valve is not influenced, the shock resistance and the impact resistance of the head part of a super capacitor product can be enhanced, the internal pressure is prevented from being leaked from the head part to impact a connected circuit board or other devices as far as possible, and the air leakage is further ensured to be opened at the explosion-proof valve.
(3) The utility model discloses the ultracapacitor system product mainly is used in the higher or higher occasion of requirement to the prevention of liquid leakage of humidity, for example intelligent three meters such as intelligent water gauge, ammeter, gas meter, vehicle event data recorder, energy recuperation system, terminal equipment such as start power, backup power. Adopted the utility model discloses a terminal equipment of ultracapacitor system product can eliminate plastic casing's potential safety hazard, not only promotes terminal equipment's reliability, ensures moreover that data transmission does not break.
Drawings
Fig. 1 is a schematic structural diagram of a supercapacitor product according to embodiment 1 of the present invention, wherein a metal casing is in a cross-sectional view;
fig. 2 is a schematic flow chart of a glue filling method for a supercapacitor product according to embodiment 1 of the present invention, wherein the metal casing is in a cross-sectional view;
fig. 3 is a schematic flow chart of another glue filling method for a supercapacitor product according to embodiment 1 of the present invention, wherein the metal shell is in a cross-sectional view;
fig. 4 is a schematic structural diagram of a supercapacitor product according to embodiment 2 of the present invention, wherein the metal shell is in a cross-sectional view;
fig. 5 is a schematic structural diagram of a supercapacitor product according to embodiment 3 of the present invention, wherein the metal casing is in a cross-sectional view.
Detailed Description
The present invention will be described in detail with reference to the following examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Example 1
As shown in fig. 1-3, the present embodiment provides a supercapacitor 100, which includes:
an open-type metal housing 110 having a receiving cavity 111 with a closed end 112 at one end and an open end 113 at the other end; a roll groove 114 is formed at one side of the open end 113 of the metal shell 110;
a supercapacitor body which is a single supercapacitor 120 and is arranged in the accommodating cavity 111 of the metal shell 110, wherein the rolling groove 114 corresponds to the beam waist groove 121 of the single supercapacitor 120;
and the sealing layer 130 is formed on the end face of the supercapacitor 120 and the open end 113 of the metal shell 110, namely, the sealing layer 130 covers the head of the supercapacitor 100 product.
As shown in fig. 2, a first glue filling method for the super capacitor 100 includes the following steps:
providing an open-type metal shell 110;
providing a monolithic supercapacitor 120;
putting the single super capacitor 120 into the accommodating cavity 111 of the metal shell 110; then, a concave rolling groove 114 is formed on one side of the open end 113 of the metal shell 110 through rolling processing, and corresponds to the girdling groove 121 of the single super capacitor 120, so that the glue solution 140 can be prevented from flowing to the bottom to block the explosion-proof valve of the single super capacitor 120 during glue filling;
and (3) performing pouring glue 140 and curing treatment on the open end 113 of the metal shell 110 and the end face of the single supercapacitor 120 to form the sealing layer 130.
As shown in fig. 3, as a second glue filling method of the super capacitor 100, the method includes the following steps:
providing an open metal shell 110, and performing rolling processing on one side of an open end 113 of the metal shell 110 to form an inward-concave rolling groove 114, which is used for preventing glue solution 140 from flowing to the bottom to block an explosion-proof valve of the single super capacitor 120 during glue pouring;
providing a monolithic supercapacitor 120;
putting the single super capacitor 120 into the accommodating cavity 111 of the metal shell 110; after the glue is placed, the rolling groove 114 just corresponds to the girdling groove 121 of the single super capacitor 120, so that the situation that the glue solution 140 flows to the bottom to block an explosion-proof valve of the single super capacitor 120 during glue pouring can be avoided;
and (3) performing pouring glue 140 and curing treatment on the open end 113 of the metal shell 110 and the end surface of the supercapacitor body to form a sealing layer 130.
It should be noted that, the roller groove 114 corresponds to the girdling groove 121 of the single supercapacitor 120, which means that after the single supercapacitor 120 is placed in the accommodating cavity 111 of the metal shell 110, the inner side of the roller groove 114 abuts against the girdling groove 121, that is, the inner diameter of the roller groove 114 is smaller than the outer diameter of the single supercapacitor 120, preferably, the inner side of the roller groove 114 is pressed against the upper port and the lower port of the girdling groove 121, so as to realize a double glue-isolation thread, and when the glue solution 140 is poured in an excessive amount, even if the glue overflow occurs on the inner upper end surface of the roller groove 114, the glue overflow flows into the area between the girdling groove 121 and the roller groove 114, and does not flow down to the bottom of the single supercapacitor 120.
Moreover, the rolling groove 114 corresponds to the girth groove 121 of the single supercapacitor 120, and particularly, the inner side of the rolling groove 114 is crimped at the upper port and the lower port of the girth groove 121, so that the adhesion between the metal shell 110 and the single supercapacitor 120 is further improved, and the stability of the supercapacitor 100 product is enhanced.
In the second glue filling method, before the single super capacitor 120 is placed, a rolling groove 114 is already formed on one side of the open end 113 of the metal shell 110, and corresponds to the girth groove 121 of the single super capacitor 120, so that the pre-positioning function is achieved, and the rolling difficulty of the first glue filling method is reduced.
In this embodiment, the rolling groove 114 and the metal housing 110 are formed in one step, the rolling groove 114 is obtained without rolling, the process steps are reduced, and the cost is reduced, and moreover, the metal housing 110 with the rolling groove 114 has better adhesion with the glue solution 140, and basically does not come unstuck, so that long-term sealing performance is ensured, the rolling groove 114 can prevent the glue solution 140 from flowing to the bottom of the supercapacitor body, namely, the glue-filled and cured sealing layer 130 is only at the sealing head, so that the glue consumption is less, and the glue cannot flow to the bottom of the supercapacitor body to seal the explosion-proof valve, namely, normal opening of the explosion-proof valve is not affected, the shock resistance and impact resistance of the head of the supercapacitor 100 product can be enhanced, internal pressure is prevented from leaking from the head to impact on a connected circuit board or other devices as far as possible, and it is.
Example 2
As shown in fig. 4, the present embodiment provides a super capacitor 200, which includes:
an open-type metal housing 210 having a receiving cavity 211 with a closed end 212 at one end and an open end 213 at the other end; a roll groove 214 is formed at one side of the open end 213 of the metal shell 210;
a supercapacitor body which is a double-body supercapacitor 220 and is arranged in the accommodating cavity 211 of the metal shell 210, wherein the rolling groove 214 is positioned at the upper side of the beam waist groove 221 of the double-body supercapacitor 220;
and the sealing layer 230 is formed on the end face of the supercapacitor 220 and the open end 213 of the metal shell 210, namely, the sealing layer 230 covers the head of the supercapacitor 200 product.
The supercapacitor of the present embodiment is different from the supercapacitor of embodiment 1 in that: (1) the super capacitor body is a double-body super capacitor; (2) the positions of the rolling grooves are located on the upper side of the beam waist groove of the double-body supercapacitor.
Example 3
As shown in fig. 5, the present embodiment provides a supercapacitor 300, which includes:
an open-type metal housing 310 having a receiving cavity 311 with a closed end 312 at one end and an open end 313 at the other end; a rolling groove 314 is formed at one side of the open end 313 of the metal shell 310;
the supercapacitor body is a three-body supercapacitor 320 and is arranged in the accommodating cavity 311 of the metal shell 310, and the position of the rolling groove 314 is positioned at the lower side of the beam waist groove 321 of the three-body supercapacitor 320;
and the sealing layer 330 is formed on the end face of the supercapacitor 320 and the open end 313 of the metal shell 310, namely, the sealing layer 330 covers the head of the supercapacitor 300 product.
The supercapacitor of the present embodiment is different from the supercapacitor of embodiment 1 in that: (1) the super capacitor body is a three-body super capacitor; (2) the position of the rolling groove is located on the lower side of the girth groove of the three-body supercapacitor.
It should be noted that the double-body supercapacitor or the triple-body supercapacitor can be connected in series or in parallel to form a supercapacitor module, and the connection mode of adjacent single supercapacitors is conventional in the art, so for convenience of illustration, the connection mode is not shown in the drawings.
The supercapacitor products of examples 1 to 3 were subjected to vibration test, salt spray test, high temperature load, cold and hot shock, high temperature and high humidity test, etc. to check the reliability of the potting product, and no liquid leakage occurred.
The operation method of each test can be seen in the standard operation method specified in the IEC62391 standard, which is specifically as follows:
vibration testing: after vibration, the user can visually see whether the glue is peeled from the shell or the product or not and whether electrolyte is leaked.
High temperature and high humidity test: and (3) placing the mixture for a period of time, such as 1000-2000H, at 65-80 ℃ and 85-90% RH, and visually checking whether liquid leakage exists.
And (3) overvoltage charging test: and (4) carrying out positive charging to ensure that the pressure is excessive, and observing whether the bottom explosion-proof valve is normally opened or not.
High-temperature load: and placing the glass tube in an oven at the temperature of 65-80 ℃ for 1000-2000H, and observing whether liquid leakage exists or not and whether the pouring glue is stripped from the shell or the product or not.
Cold and hot impact: and (3) placing the mixture for 2H at the temperature of minus 40 ℃ and 85 ℃, and visually judging whether liquid leakage exists or not and whether the pouring glue is stripped from the shell or the product or not.
And (3) salt spray testing: the product is placed in a salt spray tank for a period of time, for example, one month, and the housing and product are observed for corrosion perforations and for electrolyte leakage.
Example 4
The present embodiment provides a terminal device including the supercapacitor of any one of embodiments 1 to 3.
Specifically, the terminal device is at least one of an intelligent three-meter, a vehicle data recorder, an energy recovery system, a starting power supply and a backup power supply. The terminal device can also be a product applied in occasions with higher humidity or higher requirements on liquid leakage prevention, and is not described herein again.
The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is specific and detailed, but the invention can not be understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by adopting the equivalent substitution or equivalent transformation should fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a super capacitor, its characterized in that, it includes open type metal casing and super capacitor body, the super capacitor body is arranged in metal casing's the intracavity that holds, the terminal surface of super capacitor body with metal casing's open end encapsulating forms the sealing layer, metal casing's open end one side with be provided with the rolling groove between the super capacitor body to glue solution flow is stopped up to the bottom when avoiding the encapsulating the explosion-proof valve of super capacitor body.
2. The supercapacitor according to claim 1, wherein the roll-groove is formed by roll-forming the metal shell on the open-end side.
3. The ultracapacitor of claim 1, wherein the roller slot is integrally formed with the metal outer shell.
4. The supercapacitor according to any one of claims 1 to 3, wherein the roll groove corresponds to a beam waist groove of the supercapacitor body.
5. The supercapacitor according to any one of claims 1 to 3, wherein the roll groove is located on an upper side of a girth groove of the supercapacitor body.
6. The supercapacitor of any one of claims 1 to 3, wherein the roll groove is located on the underside of a girth groove of the supercapacitor body.
7. The ultracapacitor of claim 1, wherein the ultracapacitor body is a monolithic ultracapacitor, a dual body ultracapacitor, or a multi body ultracapacitor.
8. A terminal device, characterized in that it comprises a supercapacitor according to any one of claims 1 to 7.
9. The terminal device of claim 8, wherein the terminal device is at least one of an intelligent three-meter, a vehicle recorder, an energy recovery system, a start-up power supply, and a backup power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020744460.6U CN211980445U (en) | 2020-05-08 | 2020-05-08 | Super capacitor and terminal equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020744460.6U CN211980445U (en) | 2020-05-08 | 2020-05-08 | Super capacitor and terminal equipment |
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| CN211980445U true CN211980445U (en) | 2020-11-20 |
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| CN202020744460.6U Active CN211980445U (en) | 2020-05-08 | 2020-05-08 | Super capacitor and terminal equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111584253A (en) * | 2020-05-08 | 2020-08-25 | 肇庆绿宝石电子科技股份有限公司 | Super capacitor and glue filling method and application thereof |
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2020
- 2020-05-08 CN CN202020744460.6U patent/CN211980445U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111584253A (en) * | 2020-05-08 | 2020-08-25 | 肇庆绿宝石电子科技股份有限公司 | Super capacitor and glue filling method and application thereof |
| CN111584253B (en) * | 2020-05-08 | 2022-07-26 | 肇庆绿宝石电子科技股份有限公司 | Super capacitor and glue filling method and application thereof |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Super capacitor and terminal equipment Effective date of registration: 20210823 Granted publication date: 20201120 Pledgee: Zhaoqing Rural Commercial Bank Co.,Ltd. Dinghu sub branch Pledgor: Zhaoqing Beryl Electronic Technology Co.,Ltd. Registration number: Y2021440000268 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20220830 Granted publication date: 20201120 Pledgee: Zhaoqing Rural Commercial Bank Co.,Ltd. Dinghu sub branch Pledgor: Zhaoqing Beryl Electronic Technology Co.,Ltd. Registration number: Y2021440000268 |