CN219226527U - Battery pack and battery pack mounting structure - Google Patents
Battery pack and battery pack mounting structure Download PDFInfo
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- CN219226527U CN219226527U CN202223296358.2U CN202223296358U CN219226527U CN 219226527 U CN219226527 U CN 219226527U CN 202223296358 U CN202223296358 U CN 202223296358U CN 219226527 U CN219226527 U CN 219226527U
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- filter
- battery pack
- plate
- cover
- pressure relief
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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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- Battery Mounting, Suspending (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model discloses a battery pack and a battery pack mounting structure, comprising a battery box and a battery core module; the anti-explosion valve is arranged on the outer side of the battery box, the filtering mechanism is arranged on the inner side of the battery box and comprises a filter cover and at least one layer of filter plate positioned in the filter cover; the filter cover is provided with a plurality of filter cover filter holes, and the filter plate is provided with a plurality of filter plate filter holes; the filter cover is connected with the battery box, the pressure relief opening of the explosion-proof valve penetrates through the battery box and stretches into the filter cover, and a first space is formed between the pressure relief opening and the filter plate at intervals. According to the battery pack and the battery pack mounting structure, the filtering mechanism is arranged outside the pressure relief opening, so that the area of the filtering mechanism is increased, and the filtering effect is improved. The filtering mechanism filters particulate impurities in the flue gas outside the first space, so that the pressure relief opening can be effectively prevented from being blocked, and the pressure relief is kept smooth.
Description
Technical Field
The utility model relates to the technical field of new energy automobile batteries, in particular to a battery pack and a battery pack mounting structure.
Background
The battery pack of the new energy automobile mainly comprises a battery box, a battery module, a cooling unit, a control unit and the like. When the electric core in the battery module is heated too high, thermal runaway can occur, and a large amount of generated smoke needs to be discharged out of the battery box. In order to realize the discharge of the flue gas, an explosion-proof valve is arranged on the battery box, and the generated flue gas can be discharged from the explosion-proof valve. In order to prevent the explosion-proof valve from firing, a filter screen is added in a pressure relief port of the explosion-proof valve to filter sparks.
However, the filter screen in the prior art is arranged in the pressure relief opening of the explosion-proof valve, the filter area is small, and if sundries are blocked on the filter screen, the pressure relief opening can be blocked, so that the pressure relief is not smooth.
In view of the above, it is necessary to provide a battery pack and a battery pack mounting structure that have a good filtration effect and can prevent clogging of the pressure release port of the explosion-proof valve.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a battery pack and a battery pack mounting structure which have good filtering effect and can prevent the pressure relief opening of an explosion-proof valve from being blocked.
The technical scheme of the utility model provides a battery pack, which comprises a battery box and a battery core module arranged in the battery box;
an explosion-proof valve is arranged on the outer side of the battery box,
a filter mechanism is arranged on the inner side of the battery box and comprises a filter cover and at least one layer of filter plate positioned in the filter cover;
the filter cover is provided with a plurality of filter cover filter holes, and the filter plate is provided with a plurality of filter plate filter holes;
the filter cover is connected with the battery box, the pressure relief opening of the explosion-proof valve penetrates through the battery box and stretches into the filter cover, and a first space is formed between the pressure relief opening and the filter plate at intervals.
According to the battery pack provided by the utility model, the filter mechanism is arranged on the inner side of the battery box, the pressure relief opening of the explosion-proof valve extends into the filter cover, and the pressure relief opening is spaced from the filter plate of the filter mechanism. The filter cover filtering holes and the filter plate filtering holes are used for filtering the smoke, and the filtered smoke passes through a first space between the pressure relief opening and the filter plate and is finally discharged through the pressure relief opening. According to the battery pack provided by the utility model, the area of the filtering mechanism is increased and the filtering effect is improved by arranging the filtering mechanism outside the pressure relief opening. The filtering mechanism filters particulate impurities in the flue gas outside the first space, so that the pressure relief opening can be effectively prevented from being blocked, and the pressure relief is kept smooth.
In one optional technical scheme, more than two layers of filter plates are arranged in the filter cover, wherein any two adjacent layers of filter plates are arranged at intervals, and the filtering effect is further improved.
In one optional technical scheme, the filter holes of the filter plates on any two adjacent layers are staggered, so that the gas flow path is prolonged, more heat can be absorbed, the gas temperature and the solid particle temperature are further reduced, and the risk of igniting the combustible gas by the solid particles is reduced.
In one alternative, the filter housing includes a plurality of housing side plates and a housing end plate;
any two adjacent filter cover side plates are connected, a filter cover opening is formed by enclosing one end of each of the plurality of filter cover side plates, which faces the pressure relief opening, and the filter cover end plate is connected to the other ends of the plurality of filter cover side plates;
the filter cover end plate is provided with a plurality of filter cover filter holes;
the filter cover side plate is connected with the battery box, the filter plate is connected with the filter cover side plate, and a second space is formed between the filter plate and the filter cover end plate at intervals.
The filter cover filter holes are used for carrying out primary filtration, the filter plate filter holes are used for carrying out secondary filtration, the filter plate is spaced from the filter cover end plate, and particulate impurities flow out of the storage space after secondary filtration, so that a gas flow path is prolonged, a buffer belt function is achieved, the gas flow rate is reduced, and the secondary filtration effect is improved.
In one optional technical scheme, a plurality of filter cover filtering holes are formed in the filter cover side plate, wherein the filter cover filtering holes in the filter cover side plate are positioned between the filter plate and the filter cover end plate, so that the flow rate of gas entering the second space is increased, the gas in different directions enters the second space, the gas can be disturbed to a certain extent in the second space, the sedimentation of particulate impurities in the second space is facilitated, and the secondary filtering effect is improved.
In one alternative, the filter plate is connected to a mounting bracket, and the mounting bracket is connected to the filter housing to facilitate mounting of the filter plate.
The technical scheme of the utility model also provides a battery pack mounting structure, which comprises a chassis and the battery pack according to any one of the technical schemes, wherein the battery pack is mounted below the chassis.
According to the battery pack mounting structure, the filter mechanism in the battery pack is mounted on the inner side of the battery box, the pressure relief opening of the explosion-proof valve extends into the filter cover, and the pressure relief opening is spaced from the filter plate of the filter mechanism. The filter cover filtering holes and the filter plate filtering holes are used for filtering the smoke, and the filtered smoke passes through a first space between the pressure relief opening and the filter plate and is finally discharged through the pressure relief opening. According to the battery pack provided by the utility model, the area of the filtering mechanism is increased and the filtering effect is improved by arranging the filtering mechanism outside the pressure relief opening. The filtering mechanism filters particulate impurities in the flue gas outside the first space, so that the pressure relief opening can be effectively prevented from being blocked, and the pressure relief is kept smooth.
In one optional technical scheme, a fire extinguishing device is arranged at the bottom of the chassis and is suspended above the top cover of the battery box. When the battery pack is in thermal runaway, the electrophoresis paint on the top cover of the battery box burns, the generated high temperature and flame can automatically trigger the fire extinguishing device, and the fire extinguishing device can generate erupts to generate a series of chemical reactions with the flame to inhibit the burning reaction of the electrophoresis paint, so that the electrophoresis paint is favorable for blocking the burning, and plays a role in protection.
In one alternative, the fire extinguishing apparatus includes a protective sheath coupled to the chassis, a fire extinguishing agent within the protective sheath, and a heat sensitive wire penetrating into the fire extinguishing agent. The protective sleeve plays a role in protection, when the fire extinguishing device meets open fire or the temperature reaches 170 ℃, the thermosensitive wire can be ignited, the fire extinguishing agent is activated, and the fire extinguishing agent releases eruption through oxidation-reduction reaction to participate in fire extinguishing.
In one optional technical scheme, a plurality of fire extinguishing devices are arranged at the bottom of the chassis at intervals, so that the fire prevention and extinguishing effect of the battery pack is improved.
By adopting the technical scheme, the method has the following beneficial effects:
according to the battery pack and the battery pack mounting structure, the filter mechanism in the battery pack is mounted on the inner side of the battery box, the pressure relief opening of the explosion-proof valve stretches into the filter cover, and the pressure relief opening is spaced from the filter plate of the filter mechanism. The filter cover filtering holes and the filter plate filtering holes are used for filtering the smoke, and the filtered smoke passes through a first space between the pressure relief opening and the filter plate and is finally discharged through the pressure relief opening. According to the battery pack provided by the utility model, the filter mechanism is arranged outside the pressure relief opening, so that the area of the filter mechanism is increased, and the filter effect is improved. The filtering mechanism filters particulate impurities in the flue gas outside the first space, so that the pressure relief opening can be effectively prevented from being blocked, and the pressure relief is kept smooth.
Drawings
The present disclosure will become more readily understood with reference to the accompanying drawings. It should be understood that: the drawings are for illustrative purposes only and are not intended to limit the scope of the present utility model. In the figure:
fig. 1 is a top view of a battery pack according to an embodiment of the present utility model after a top cover of a battery box is opened;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is a perspective view of a filter housing;
FIG. 4 is a perspective view of the filter plate attached to the mounting bracket;
FIG. 5 is a cross-sectional view of the filter plate and mounting bracket shown;
fig. 6 is a sectional view of a battery pack mounting structure provided in an embodiment of the present utility model;
FIG. 7 is an enlarged view of portion B of FIG. 6;
fig. 8 is a cross-sectional view of the fire extinguishing apparatus.
Detailed Description
Specific embodiments of the present utility model will be further described below with reference to the accompanying drawings. Wherein like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "inner" and "outer" refer to directions toward or away from, respectively, the geometric center of a particular component.
As shown in fig. 1-3, a battery pack according to an embodiment of the present utility model includes a battery case 1 and a battery cell module 2 installed in the battery case 1.
An explosion-proof valve 3 is arranged on the outer side of the battery box 1,
the inside of the battery box 1 is mounted with a filter mechanism 4, and the filter mechanism 4 includes a filter housing 41 and at least one filter sheet 42 in the filter housing 41.
The filter housing 41 is provided with a plurality of filter housing filter holes 410, and the filter sheet 42 is provided with a plurality of filter sheet filter holes 420.
The filter housing 41 is connected with the battery box 1, the pressure relief opening 31 of the explosion-proof valve 3 penetrates through the battery box 1 and stretches into the filter housing 41, and a first space 414 is formed between the pressure relief opening 31 and the filter plate 42 at intervals.
The battery pack provided by the utility model is a power battery of a new energy automobile, and comprises a battery box 1, a battery core module 2, an explosion-proof valve 3 and a filtering mechanism 4.
A plurality of cell modules 2 are mounted in the battery box 1. The explosion-proof valve 3 is installed at one end of the battery case 1, and the explosion-proof valve 3 may be a pressure relief valve of the prior art having a pressure relief port 31. The pressure relief port 31 penetrates through a through-hole of a side plate or frame of the battery case 1 and protrudes into the inside of the battery case 1.
The filter mechanism 4 is mounted on the inside of a side plate or frame of the battery box 1, and is used for covering the pressure relief port 31, and performs a filtering function.
The filter mechanism 4 includes a filter housing 41 having a plurality of filter housing filter apertures 410 and a filter plate 42 having a plurality of filter plate filter apertures 420. At least one layer of filter plates 42 is installed in the filter housing 41. The filter housing 41 is detachably connected to the battery box 1, and the filter housing and the battery box can be connected by a buckle, a bolt, a screw, or the like. The relief vent 31 protrudes into the filter housing 41, and the relief vent 31 is spaced from the filter plate 42 with a first space 414 formed therebetween.
When the battery core module 2 is out of control, the generated smoke is filtered through the filter cover filter holes 410, then passes through the filter plate filter holes 420, then passes through the first space 414 for buffering sedimentation, finally enters the explosion-proof valve 3 through the pressure relief opening 31, and is discharged from the exhaust port of the explosion-proof valve 3.
The filter housing filter holes 410 perform a primary filtering function, the filter plate filter holes 420 perform a secondary filtering function, and the pore diameter of the filter plate filter holes 420 may be designed to be smaller than that of the filter housing filter holes 410 as required.
According to the battery pack provided by the utility model, the filter mechanism 4 is arranged on the outer side of the pressure relief opening 31, the filter cover 41 wraps the pressure relief opening 31, the areas of the filter cover 41 and the filter plate 42 are not limited by the pressure relief opening 31, the filter areas of the filter cover 41 and the filter plate 42 are large, and the number of the arranged filter holes is large, so that the filtering effect is improved.
In the battery pack according to the present utility model, a first space 414 is formed between the pressure release port 31 and the filter sheet 42. The filter cover 41 and the filter plate 42 filter large particulate matters outside the first space 414, so that the pressure relief opening 31 can be effectively prevented from being blocked, and the pressure relief smoothness can be maintained. The first space 414 also serves to extend the airflow path and absorb more heat, which is beneficial to lower the gas temperature and the solid particle temperature and reduce the risk of the solid particles igniting the combustible gas.
In one embodiment, as shown in fig. 2 and 5, two or more layers of filter plates 42 are installed in the filter housing 41, wherein any adjacent two layers of filter plates 42 are spaced apart.
In this embodiment, by disposing two or more layers of filter plates 42 in the filter housing 41, the secondary filtration can be performed twice or more, and the filtration effect can be further improved.
Any two adjacent layers of filter plates 42 are arranged at intervals, so that cavities are formed between the two adjacent layers of filter plates 42, the effect of prolonging the airflow path is achieved, more heat can be absorbed, the gas temperature and the solid particle temperature are further reduced, and the risk of igniting combustible gas by solid particles is reduced.
In one embodiment, the filter plate filter holes 420 on any two adjacent layers of filter plates 42 are staggered, which further prolongs the gas flow path, and is beneficial to further reducing the gas temperature and the solid particle temperature and reducing the risk of igniting the combustible gas by the solid particles.
In one embodiment, as shown in fig. 2-3, the filter housing 41 includes a plurality of filter housing side plates 411 and a filter housing end plate 412.
Any two adjacent filter casing side plates 411 are connected, a filter casing opening 413 is formed at one end of the filter casing side plates 411 facing the pressure relief opening 31, and a filter casing end plate 412 is connected to the other end of the filter casing side plates 411.
The filter housing end plate 412 has a plurality of filter housing filter apertures 410 disposed therein.
The filter housing side plate 411 is connected to the battery case 1, the filter sheet 42 is connected to the filter housing side plate 411, and a second space 415 is formed between the filter sheet 42 and the filter housing end plate 412.
In this embodiment, the filter housing 41 is in a box shape, and is formed by connecting a plurality of filter housing side plates 411 and a filter housing end plate 412. The filter end plate 412 is oriented toward the inside of the battery case 1, and a plurality of filter holes 410 are provided in the filter end plate 412. The filter housing opening 413 of the filter housing 41 is connected to a side plate or frame of the battery box 1, and the pressure relief port 31 extends from the filter housing opening 413 into the filter housing 41. The filter plate 42 and the filter cover end plate 412 are arranged at intervals, a second space 415 is formed between the filter plate 42 and the filter cover end plate 412, particle impurities flow out of the storage space after secondary filtration, a gas flow path is prolonged, a buffer belt function is achieved, the gas flow rate is reduced, the secondary filtration effect is improved, the gas temperature and the solid particle temperature are reduced, and the risk of igniting combustible gas by solid particles is reduced.
In one embodiment, as shown in fig. 3, a plurality of filter housing filter holes 410 are provided in the filter housing side plate 411, wherein the filter housing filter holes 410 in the filter housing side plate 411 are located between the filter plate 42 and the filter housing end plate 412.
In this embodiment, a plurality of filter casing filtering holes 410 are also configured on the filter casing side plate 411, and the filter casing filtering holes 410 on the filter casing side plate 411 are communicated with the second space 415, so that the flow rate of the gas entering the second space 415 is increased, the gas in different directions enters the second space 415, a certain degree of turbulence can occur in the second space 415, the sedimentation of particulate impurities in the second space 415 is facilitated, and the secondary filtering effect is improved.
In one embodiment, as shown in fig. 2 and 4, the filter plate 42 is connected to a mounting bracket 43, and the mounting bracket 43 is connected to the filter housing 41.
In this embodiment, more than one filter plate 42 is assembled together to form a module by the mounting bracket 43, and then the mounting bracket 43 is connected to the filter housing side plate 411, so that the filter plate 42 can be conveniently mounted.
As shown in fig. 6, an embodiment of the present utility model provides a battery pack mounting structure, which includes a chassis 5 and the battery pack according to any of the foregoing embodiments, where the battery pack is mounted under the chassis 5.
In the battery pack mounting structure provided by the utility model, the filter mechanism 4 in the battery pack is mounted on the inner side of the battery box 1, the pressure relief opening 31 of the explosion-proof valve 3 stretches into the filter cover 41, and the pressure relief opening 31 is spaced from the filter plate 42 of the filter mechanism 4. The filter housing filtering holes 410 and the filter plate filtering holes 420 filter the flue gas, and the filtered flue gas passes through the first space 414 between the pressure relief opening 31 and the filter plate 42 and finally is discharged through the pressure relief opening 31. According to the battery pack provided by the utility model, the area of the filter mechanism 4 is increased and the filter effect is improved by arranging the filter mechanism 4 outside the pressure relief opening 31. The filtering mechanism 4 filters the particulate impurities in the flue gas outside the first space 414, so that the pressure relief opening 31 can be effectively prevented from being blocked, and the smooth pressure relief can be maintained.
In one of the embodiments, as shown in fig. 6-7, the bottom of the chassis 5 is provided with a fire extinguishing device 6, the fire extinguishing device 6 being suspended above the top cover 11 of the battery box 1.
In this embodiment, a preset gap is provided between the top cover 11 of the battery box 1 and the chassis 5, and the fire extinguishing device 6 is mounted at the bottom of the chassis 5, and the fire extinguishing device 6 is suspended above the top cover 11 of the battery box 1.
The fire extinguishing device 6 can adopt a self-triggering fire extinguishing tank, a fire extinguisher and the like with a temperature sensor.
When the battery pack is in thermal runaway, the electrophoresis paint on the top cover 11 of the battery box 1 burns, the generated high temperature and flame can automatically trigger the fire extinguishing device 6, and the fire extinguishing device 6 can generate a series of chemical reactions with the flame to inhibit the burning reaction of the electrophoresis paint, so that the electrophoresis paint is beneficial to blocking the burning and plays a role in protection.
In one embodiment, as shown in fig. 7-8, the fire extinguishing device 6 includes a protective sheath 61 connected to the chassis 5, a fire extinguishing agent 62 in the protective sheath 61, and a heat sensitive wire 63 penetrating into the fire extinguishing agent 62.
In this embodiment, the fire extinguishing apparatus 6 employs a protective sheath 61, a fire extinguishing agent 62 and a heat sensitive wire 63 to reduce the structural volume. The fire extinguishing agent 62 is enclosed in the protective sheath 61, one end of the thermosensitive wire 63 is outside the protective sheath 61, and the other end thereof is inserted into the fire extinguishing agent 62. The protective sheath 61 may be mounted to the bottom of the chassis 5 by brackets.
The protective sleeve 61 is made of fireproof materials (for example, PVC protective sleeve), and the protective sleeve 61 has flame-retardant and heat-insulating effects.
The fire extinguishing agent 62 is a conventional chemical agent, and its main components are potassium nitrate, strontium nitrate, phenolic novolac resin, basic magnesium carbonate, etc. The heat absorption decomposition cooling effect of the fire extinguishing agent and the chemical inhibition effect of the gas phase and the solid phase are used cooperatively to inhibit combustion.
The heat-sensitive wire 63 is a component in the prior art, and when the ambient temperature reaches the starting temperature of the heat-sensitive wire 63 (e.g., 170 ℃), the heat-sensitive wire 63 will spontaneously ignite, the heat-sensitive wire 63 activates the fire extinguishing agent 62, and the fire extinguishing agent 62 releases a spray (e.g., to participate in fire extinguishing) through a redox reaction.
In one embodiment, a plurality of fire extinguishing devices 6 are arranged at intervals at the bottom of the chassis 5, so that the fire prevention and extinguishing effect of the battery pack is improved.
The above technical schemes can be combined according to the need to achieve the best technical effect.
The foregoing is only illustrative of the principles and preferred embodiments of the present utility model. It should be noted that several other variants are possible to those skilled in the art on the basis of the principle of the utility model and should also be considered as the scope of protection of the present utility model.
Claims (10)
1. The battery pack is characterized by comprising a battery box and a battery cell module arranged in the battery box;
an explosion-proof valve is arranged on the outer side of the battery box,
a filter mechanism is arranged on the inner side of the battery box and comprises a filter cover and at least one layer of filter plate positioned in the filter cover;
the filter cover is provided with a plurality of filter cover filter holes, and the filter plate is provided with a plurality of filter plate filter holes;
the filter cover is connected with the battery box, the pressure relief opening of the explosion-proof valve penetrates through the battery box and stretches into the filter cover, and a first space is formed between the pressure relief opening and the filter plate at intervals.
2. The battery pack of claim 1, wherein more than two layers of the filter plates are mounted in the filter housing, wherein any adjacent two layers of the filter plates are spaced apart.
3. The battery pack of claim 2, wherein the filter plate filter holes on any two adjacent layers of the filter plates are staggered.
4. The battery pack of claim 1, wherein the filter housing comprises a plurality of filter housing side plates and a filter housing end plate;
any two adjacent filter cover side plates are connected, a filter cover opening is formed by enclosing one end of each of the plurality of filter cover side plates, which faces the pressure relief opening, and the filter cover end plate is connected to the other ends of the plurality of filter cover side plates;
the filter cover end plate is provided with a plurality of filter cover filter holes;
the filter cover side plate is connected with the battery box, the filter plate is connected with the filter cover side plate, and a second space is formed between the filter plate and the filter cover end plate at intervals.
5. The battery pack of claim 4, wherein a plurality of said filter housing filter apertures are provided in said filter housing side plates, wherein said filter housing filter apertures in said filter housing side plates are located between said filter plate and said filter housing end plates.
6. The battery pack of claim 1, wherein the filter plate is coupled to a mounting bracket coupled to the filter housing.
7. A battery pack mounting structure comprising a chassis and the battery pack of any one of claims 1 to 6, the battery pack being mounted below the chassis.
8. The battery pack mounting structure of claim 7, wherein the bottom of the chassis is provided with a fire extinguishing device suspended above a top cover of the battery box.
9. The battery pack mounting structure of claim 8 wherein said fire suppression means comprises a protective sleeve connected to said chassis, a fire suppression agent in said protective sleeve, and a heat sensitive wire penetrating into said fire suppression agent.
10. The battery pack mounting structure of claim 8, wherein the bottom of the chassis is provided with a plurality of the fire extinguishing devices at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223296358.2U CN219226527U (en) | 2022-12-08 | 2022-12-08 | Battery pack and battery pack mounting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223296358.2U CN219226527U (en) | 2022-12-08 | 2022-12-08 | Battery pack and battery pack mounting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219226527U true CN219226527U (en) | 2023-06-20 |
Family
ID=86740195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223296358.2U Active CN219226527U (en) | 2022-12-08 | 2022-12-08 | Battery pack and battery pack mounting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219226527U (en) |
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2022
- 2022-12-08 CN CN202223296358.2U patent/CN219226527U/en active Active
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Effective date of registration: 20230815 Granted publication date: 20230620 |