CN214607388U - Circuit system and vehicle with low-voltage storage battery omitted - Google Patents

Circuit system and vehicle with low-voltage storage battery omitted Download PDF

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Publication number
CN214607388U
CN214607388U CN202120202209.1U CN202120202209U CN214607388U CN 214607388 U CN214607388 U CN 214607388U CN 202120202209 U CN202120202209 U CN 202120202209U CN 214607388 U CN214607388 U CN 214607388U
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power
series
voltage
low
battery
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Inventor
董福田
刘崇威
彭爽
申大鹏
韩政达
赵文强
李宏涛
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Great Wall Motor Co Ltd
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Great Wall Motor Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/72Electric energy management in electromobility
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/14Plug-in electric vehicles

Abstract

The present disclosure relates to a circuit system and a vehicle that eliminates a low voltage battery. The circuit system comprises a charging interface, a bidirectional DC-DC converter and a control module, wherein the charging interface is used for being connected with an external power supply, and the charging interface, the bidirectional DC-DC converter and the control module are sequentially connected in series to form a first series loop; the bidirectional DC-DC converter is used for pre-charging a bus capacitor of the control module after boosting the voltage passing through the charging interface when the external power supply supplies power to the first series loop through the charging interface. By adopting the circuit system, the whole vehicle can be started safely under the condition of canceling a low-voltage storage battery of the vehicle.

Description

Circuit system and vehicle with low-voltage storage battery omitted
Technical Field
The present disclosure relates to the field of vehicle technology, and more particularly, to a circuit system and a vehicle with a low-voltage battery.
Background
With the rapid development of new energy technologies, the design of a vehicle high-voltage framework is mature and complete. With the acceleration of a new scientific and technological revolution and industrial change in the world, new technologies such as intellectualization and the like enable an energy supply side, a demand side, energy storage, intelligent response and the like to be connected together unprecedentedly, and the life of people is greatly influenced. For example, in the logistics assembly field, the new energy trolley can be applied to cargo transportation, and the novel energy trolley has the advantages of improving the efficiency, saving the cost, protecting the environment, saving the energy and the like, which are not possessed by traditional vehicles or manual transportation.
In the related art, a 12V battery built in an electric vehicle is used very frequently, occupies a large amount of design space in the vehicle, and is also high in battery cost.
SUMMERY OF THE UTILITY MODEL
The invention aims to provide a circuit system and a vehicle with a cancelled low-voltage storage battery, so that the whole vehicle can be started safely even if the low-voltage storage battery of the vehicle is cancelled.
In order to achieve the above object, according to a first aspect of the embodiments of the present disclosure, there is provided a circuit system applied to a vehicle, including:
the charging interface is used for being connected with an external power supply, and the charging interface, the bidirectional DC-DC converter and the control module are sequentially connected in series to form a first series loop;
the bidirectional DC-DC converter is used for pre-charging a bus capacitor of the control module after boosting the voltage passing through the charging interface when the external power supply supplies power to the first series loop through the charging interface.
Optionally, the circuit system further includes a battery management system and a low-voltage power device, and the charging interface, the bidirectional DC-DC converter, the battery management system, and the low-voltage power device are sequentially connected in series to form a second series circuit, so that the external power supply can supply power to the battery management system and the low-voltage power device in the second series circuit through the charging interface before charging of a bus capacitor of the control module is completed.
Optionally, the circuit system further comprises a power battery module and a relay;
the power battery module, the relay, the bidirectional DC-DC converter, the battery management system and the low-voltage power device are sequentially connected in series to form a third series circuit;
the battery management system can control the relay to be closed when detecting that the absolute value of the difference value between the voltage at the two ends of the bus of the control module and the voltage at the two ends of the bus of the power battery module is smaller than or equal to a safe voltage threshold value, so that the process that the external power supply precharges the bus capacitor of the control module is completed;
the power battery module can supply power to the battery management system and the low-voltage power device in the third series circuit through the bidirectional DC-DC converter in a state that the relay is closed.
Optionally, the power battery module, the relay and the control module are sequentially connected in series to form a fourth series loop;
the power battery module can supply power to the control module in the fourth series circuit in the state that the relay is closed.
Optionally, a fuse is connected in series between the power battery module and the relay;
the battery management system can blow the fuse to disconnect the power supply of the power battery module to the control module, the battery management system and the low-voltage electric device when the vehicle is determined to be collided or the circuit system is short-circuited.
Optionally, the circuit system further includes an alarm device, and the alarm device is connected in series with the low-voltage power utilization device and a target sub-battery module in the power battery module to form a fifth series loop;
and when the battery management system determines that the vehicle is in collision or the circuit system is short-circuited, the switch on the fifth series circuit is closed, so that the target sub-battery module supplies power to the alarm device and the low-voltage power utilization device.
Optionally, the battery management system can control the relay to be disconnected after the electric appliance for the whole vehicle stops working, the electric appliance for the whole vehicle comprises the control module, the battery management system and the low-voltage electric appliance.
Optionally, the charging interface is a diagnosis interface, the diagnosis interface is further configured to be connected with a finished automobile diagnosis device, and the finished automobile diagnosis device can diagnose the vehicle through the charging interface when the vehicle changes the power battery every time.
Optionally, the control module is a motor controller, or the control module is a multi-controller integrated module including a motor controller.
According to a second aspect of the embodiments of the present disclosure, there is provided a vehicle that eliminates a low-voltage battery, including the circuit system of any one of the first aspects described above.
By adopting the circuit system, at least the following technical effects can be achieved:
the circuit system comprises a charging interface, a bidirectional DC-DC converter and a control module. The charging interface, the bidirectional DC-DC converter and the control module are sequentially connected in series to form a first series loop. The bidirectional DC-DC converter can pre-charge a bus capacitor of the control module after boosting the voltage passing through the charging interface when the external power supply supplies power to the first series loop through the charging interface. The circuit system realizes the pre-charging function of the 12V storage battery in the related art by utilizing the charging interface. Therefore, by adopting the circuit system of the present disclosure, the whole vehicle can be started safely under the condition that a low-voltage storage battery of the vehicle is eliminated.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a circuit diagram illustrating an exemplary embodiment according to the present disclosure.
Fig. 2 is a block diagram illustrating a circuit system according to an exemplary embodiment of the present disclosure.
Fig. 3 is a block diagram illustrating another circuitry according to an example embodiment of the present disclosure.
Fig. 4 is a block diagram illustrating another circuitry according to an example embodiment of the present disclosure.
Fig. 5 is a block diagram illustrating another circuitry according to an example embodiment of the present disclosure.
Fig. 6 is a block diagram illustrating another circuitry according to an example embodiment of the present disclosure.
Fig. 7 is a block diagram illustrating another circuitry according to an example embodiment of the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
It will be appreciated by those skilled in the art that the motor controller load associated with an electric vehicle has a large capacitor at the front end, and there is no charge on the capacitor or only a very low residual voltage on the capacitor during cold start. Because the voltage of the power battery module carried by the electric automobile is very high, and the voltage on the front-end capacitor of the load of the motor controller is close to zero, the short circuit condition can occur when the power battery module carried by the electric automobile is communicated with the load of the motor controller.
In the related art, in order to avoid such a short-circuit situation, a precharge circuit is designed. Specifically, as shown in fig. 1. The motor controller load MCU is precharged by a 12V battery built in the electric vehicle. When the difference between the voltage of the front-end capacitor of the motor controller load and the voltage of the power battery module is small enough, a communication loop of the 12V storage battery and the motor controller load MCU is cut off, and therefore the pre-charging process is completed.
However, the 12V battery of the electric vehicle has a very low frequency of use and a high cost of the battery, and occupies a large space in the vehicle. The storage battery can not be reused when the whole vehicle is in short circuit or collision.
In view of this, the embodiments of the present disclosure provide a circuit system and a vehicle with a low-voltage battery eliminated, so that the entire vehicle can be started safely even when the low-voltage battery of the vehicle is eliminated. And the conventional 12V storage battery design is cancelled, so that the cost of the whole vehicle can be reduced, and the weight and the space of the vehicle body can be reduced.
Fig. 2 is a block diagram illustrating a circuit system according to an exemplary embodiment of the present disclosure, as shown in fig. 2, the circuit system 100 including:
the charging system comprises a charging interface 101, a bidirectional DC-DC converter 102 and a control module 103, wherein the charging interface 101 is used for being connected with an external power supply, and the charging interface 101, the bidirectional DC-DC converter 102 and the control module 103 are sequentially connected in series to form a first series loop; the bidirectional DC-DC converter 102 is configured to, when the external power supply supplies power to the first series circuit through the charging interface 101, boost the voltage through the charging interface 101 and then pre-charge the bus capacitor of the control module 103.
Wherein 104 is a motor. The plug-in components are plug-in connectors. A bidirectional DC-DC converter is a device that converts a DC power supply of a certain voltage class into a DC power supply of another voltage class.
Optionally, the charging interface 101 may be specifically a diagnostic interface, and the diagnostic interface is further configured to be connected to a finished vehicle diagnostic device, where the finished vehicle diagnostic device can diagnose the vehicle through the charging interface when the power battery of the vehicle is replaced each time.
It should be noted here that the diagnosis interface is a vehicle fault diagnosis OBD interface, is an external interface, and can perform vehicle fault diagnosis, and simultaneously can supply power to the DC-DC, thereby providing a vehicle low-voltage power supply. The voltage of the external power supply can be 6V, 12V or 15V, and the voltage of the external power supply is not particularly limited by the disclosure.
With such a circuit system 100, the circuit system 100 includes a charging interface 101, a bidirectional DC-DC converter 102, and a control module 103. The charging interface 101, the bidirectional DC-DC converter 102 and the control module 103 are sequentially connected in series to form a first series loop. The charging interface 101 is used for connecting an external power supply, and the bidirectional DC-DC converter 102 can pre-charge a bus capacitor of the control module 103 after boosting the voltage passing through the charging interface 101 when the external power supply supplies power to the first series circuit through the charging interface 101. The circuit system 100 realizes the pre-charging function of the 12V storage battery in the related art by using the external power supply of the charging interface 101. Therefore, by adopting the circuit system 100 disclosed by the disclosure, under the condition that a 12V low-voltage storage battery of a vehicle is cancelled, the external power supply through the charging interface 101 can also realize the pre-charging of the bus capacitor of the control module 103, and further, the problem that when no pre-charging is carried out, the voltage on the front-end capacitor of the load of the motor controller is close to zero due to the fact that the voltage on the power battery module carried by the electric vehicle is very high, and the short circuit occurs when the power battery module carried by the electric vehicle is communicated with the load of the motor controller is avoided, so that the whole vehicle can be started safely.
Optionally, the circuit system 100 further includes a Battery Management System (BMS)105 and a low-voltage power device 106, and the charging interface 101, the bidirectional DC-DC converter 102, the battery management system 105 and the low-voltage power device 106 are sequentially connected in series to form a second series circuit, as shown in fig. 3, so that the external power source can supply power to the battery management system 105 and the low-voltage power device 106 in the second series circuit through the charging interface 101 before the charging of the bus capacitor of the control module 103 is completed.
The battery management system is a power battery pack management system and is responsible for collecting voltage and temperature of a whole battery cell, controlling high-voltage components, controlling the thermal management system, managing charging and discharging and the like.
The low-voltage electric devices 106 are meters, lamps, and the like on the vehicle.
With this circuit system 100, during the process of charging the bus capacitor of the control module 103 by the external power source, i.e., during the process of pre-charging the vehicle, the external power source can supply power to the battery management system 105 and the low-voltage electric device 106, so that the battery management system 105 and the low-voltage electric device 106 are normally used.
Optionally, the circuit system 100 further includes a power battery module 107 and a relay 108;
the power battery module 107, the relay 108, the bidirectional DC-DC converter 102, the battery management system 105, and the low-voltage electric device 106 are sequentially connected in series to form a third series circuit, as shown in fig. 4; the battery management system 105 can control the relay 108 to be closed when detecting that the absolute value of the difference value between the voltage at the two ends of the bus of the control module 103 and the voltage at the two ends of the bus of the power battery module 107 is less than or equal to a safe voltage threshold value, so as to complete the process of pre-charging the bus capacitor of the control module 103 by the external power supply; the power battery module 107 can supply power to the battery management system 105 and the low-voltage electric device 106 in the third series circuit through the bidirectional DC-DC converter 102 in a state where the relay 108 is closed.
The power battery module 107 is a power source of a power battery and is also a power supply source of the whole vehicle.
Among other things, relay 108 is controlled by the BMS and acts as a switch for the main circuit harness.
With the circuit system 100, in a state where the relay 108 is closed, the power battery module 107 steps down the voltage by the bidirectional DC-DC converter 102, and then supplies low-voltage power to the battery management system 105 and the low-voltage power consumption device 106.
Optionally, the power battery module 107, the relay 108 and the control module 103 are sequentially connected in series to form a fourth series circuit, specifically as shown in fig. 5; the set of power cells 107 is able to supply power to the control module 103 in the fourth series circuit with the relay 108 closed.
Optionally, with continued reference to fig. 5, a fuse 109 is connected in series between the power battery module 107 and the relay 108; the battery management system 105 can control to blow the fuse 108 to disconnect the power supply of the power battery module 107 to the control module 103, the battery management system 105 and the low-voltage electric device 106 when the vehicle is determined to be in a collision or the circuit system 100 is in a short circuit.
The fuse 109 provides safety, and when a fault such as a short circuit or a collision occurs, if the relay 108 cannot be timely disconnected, the fuse 109 performs fuse protection.
Optionally, the circuit system 100 further includes an alarm device 110, where the alarm device 110 is connected in series with the low-voltage electric device 106 and a target sub-battery module of the power battery module 107 to form a fifth series circuit, as shown in fig. 6 specifically; when it is determined that the vehicle has a collision or the circuit system is short-circuited 100, the battery management system 105 may close a switch on the fifth series circuit, so that the target sub battery module supplies power to the alarm device 110 and the low-voltage power device 106.
The target sub-battery module is a 12V sub-battery module separated from the power battery module 107.
Optionally, the battery management system 105 may control the relay 108 to be turned off after the vehicle electrical equipment including the control module 103, the battery management system 105, the bidirectional DC-DC converter 102, and the low-voltage electrical equipment 106 stops operating.
That is, after all the electrical devices on the vehicle stop operating, the relay 108 is opened, so that the power battery module 107 stops supplying power.
Optionally, the control module MCU103 is a motor controller, or the control module 103 is a multi-controller integrated module including a motor controller.
The control module is a controller between the connector power battery module and the driving motor, and controls the operation (rotating speed, power and the like) of the driving motor, and generally, a single motor controller or a multi-in-one controller integrating multiple modules is provided.
Fig. 7 is a block diagram illustrating another circuit system according to an exemplary embodiment of the present disclosure, including all of the series circuits in the above embodiments. Reference numeral 111 in fig. 7 denotes a current sensor, which is a component for detecting an overcurrent in the bus of the power battery module.
Specifically, in the whole vehicle power-on process, the diagnosis interface is externally connected with a power supply, the power supply supplies power to the BMS and the low-voltage power utilization device all the way through bidirectional DC/DC reverse voltage boosting, the motor controller bus capacitor is charged all the way, and when the BMS detects that the difference between the voltage at two ends of the motor controller bus and the voltage at two ends of the power battery module bus reaches a safe voltage threshold (such as 0.5V, 1V, 2V and other thresholds), the relay can be controlled to be closed, and high-voltage power-on is completed. Further, after the high-voltage power-on is completed, the power battery module can be used for supplying power to the BMS and the low-voltage power load through the bidirectional DC/DC. If the vehicle bumps, when short circuit in the operation process, BMS monitors and can send out signal promptly and break off the relay in the very short time, and closed warning loop reports to the police, and low pressure consumer can not cut off the power supply simultaneously. The alarm device and the control logic can be defined according to the requirements of users. The present disclosure is not particularly limited thereto. In the power-off process of the vehicle, after the electric appliance of the whole vehicle stops working, the BMS can directly control the relay to break the contact.
The embodiment of the disclosure also provides a vehicle without a low-voltage storage battery, which comprises any circuit system in the embodiment.
According to the vehicle disclosed by the invention, a 12V storage battery in a traditional new energy vehicle is eliminated, the whole vehicle is started by taking the diagnosis interface as a driving interface, and low voltage is provided by the battery pack and the DCDC, so that the cost of the storage battery is reduced. And the space occupied by the components in the whole package and the weight of the whole vehicle are reduced, and the battery life is also improved. In addition, after the vehicle has failed, the low voltage power utilization device and the BMS supply power are separated from the module by 12V as power supply. When the battery is replaced every time, the diagnosis can be carried out through the diagnosis interface, and the safety of the whole vehicle is greatly improved.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A circuit system, applied to a vehicle, comprising:
the charging interface is used for being connected with an external power supply, and the charging interface, the bidirectional DC-DC converter and the control module are sequentially connected in series to form a first series loop;
the bidirectional DC-DC converter is used for pre-charging a bus capacitor of the control module after boosting the voltage passing through the charging interface when the external power supply supplies power to the first series loop through the charging interface.
2. The circuit system according to claim 1, further comprising a battery management system and a low-voltage power device, wherein the charging interface, the bidirectional DC-DC converter, the battery management system and the low-voltage power device are sequentially connected in series to form a second series circuit, so that the external power source can supply power to the battery management system and the low-voltage power device in the second series circuit through the charging interface before charging of the bus capacitor of the control module is completed.
3. The circuit system of claim 2, further comprising a power battery module and a relay;
the power battery module, the relay, the bidirectional DC-DC converter, the battery management system and the low-voltage power device are sequentially connected in series to form a third series circuit;
the battery management system is used for controlling the relay to be closed so as to complete the process of pre-charging the bus capacitor of the control module by the external power supply;
the power battery module can supply power to the battery management system and the low-voltage power device in the third series circuit through the bidirectional DC-DC converter in a state that the relay is closed.
4. The circuit system of claim 3, wherein the power battery module, the relay and the control module are sequentially connected in series to form a fourth series loop;
the power battery module can supply power to the control module in the fourth series circuit in the state that the relay is closed.
5. The circuit system according to claim 3 or 4, characterized in that a fuse is connected in series between the power battery module and the relay;
the battery management system is used for controlling the fuse to be fused so as to disconnect the power supply of the power battery module to the control module, the battery management system and the low-voltage electric device.
6. The circuit system according to claim 5, further comprising an alarm device, wherein the alarm device is connected in series with the low-voltage power utilization device and a target sub-battery module in the power battery modules to form a fifth series loop;
and the battery management system is used for closing a switch on the fifth series circuit so as to enable the target sub-battery module to supply power to the alarm device and the low-voltage power utilization device.
7. The circuit system according to claim 3 or 4, wherein the battery management system is configured to control the relay to be opened, so that the power battery module stops supplying power to the control module, the battery management system and the low-voltage power utilization device.
8. The circuit system according to any one of claims 1-3, wherein the charging interface is a diagnostic interface, the diagnostic interface is further configured to connect to a vehicle diagnostic device, and the vehicle diagnostic device is capable of diagnosing the vehicle via the charging interface each time the vehicle changes the power battery.
9. The circuitry of any of claims 1-3, wherein the control module is a motor controller or wherein the control module is a multi-controller integrated module comprising a motor controller.
10. A vehicle eliminating a low-voltage battery, characterized in that it comprises a circuit system according to any one of claims 1 to 9.
CN202120202209.1U 2021-01-25 2021-01-25 Circuit system and vehicle with low-voltage storage battery omitted Active CN214607388U (en)

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Application Number Priority Date Filing Date Title
CN202120202209.1U CN214607388U (en) 2021-01-25 2021-01-25 Circuit system and vehicle with low-voltage storage battery omitted

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120202209.1U CN214607388U (en) 2021-01-25 2021-01-25 Circuit system and vehicle with low-voltage storage battery omitted

Publications (1)

Publication Number Publication Date
CN214607388U true CN214607388U (en) 2021-11-05

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