CN218040825U - Direct current charging protection device for charging electric bicycle - Google Patents

Direct current charging protection device for charging electric bicycle Download PDF

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Publication number
CN218040825U
CN218040825U CN202221356431.8U CN202221356431U CN218040825U CN 218040825 U CN218040825 U CN 218040825U CN 202221356431 U CN202221356431 U CN 202221356431U CN 218040825 U CN218040825 U CN 218040825U
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resistor
circuit
charger
output end
charging
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张强胜
张钦尧
吴大军
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Suzhou Milite Intelligent Technology Co ltd
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Suzhou Milite Intelligent Technology Co ltd
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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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model provides a direct current protection device that charges that electric bicycle charges usefulness, it includes supply circuit, logic control circuit, signal sampling circuit, indicating circuit, drive circuit and direct current switch circuit. The overcharge can be detected through the matching of all the circuits, and when the battery is fully charged, the direct current power supply is automatically cut off; the capacity and the defects of the storage battery can be detected; the fault of the alternating current charger and the connection condition of the alternating current power supply circuit can be detected, and alarm management and protection are performed; the matching of the charger and the storage battery is automatically calculated, and an automatic alarm is given under the condition of using a wrong charger (a high-voltage charger is used for charging a low-voltage battery, and the low-voltage charger is used for charging the high-voltage battery). The product can be directly connected with the direct current output end of the original charger in series, the use is simple and convenient, and any structure of the charger and the electric vehicle is not required to be changed; finally, the product can be formed into a module product independently, and can also be integrated into a charger.

Description

Direct current charging protection device for charging electric bicycle
Technical Field
The utility model relates to a charger protection equipment technical field, in particular to direct current charging protection device of electric bicycle usefulness that charges.
Background
Nowadays, electric bicycles are more and more commonly used in life, and the electric bicycles need to be charged after the storage batteries consume electricity.
However, in the process of charging the storage battery by using the charger, the following problems are caused: 1) The battery charging method comprises the following steps that excessive charging is carried out, generally, eight-hour charging can completely meet the requirements of users, but in order to enable the battery of the electric vehicle to be charged a little more and to travel a little more, twelve-hour or even longer charging is selected by some users, so that the positive effect cannot be achieved, and the performance of the battery can be reduced; 2) The battery is ignited due to high-temperature charging for a long time, and hot high temperature brings many hidden dangers, for example, when the battery of the electric bicycle is charged, many users directly charge the battery on a bicycle, so that the hidden dangers are buried, for example, the battery is ignited and exploded due to high temperature, and the proportion is nearly three times of that of the battery of the electric bicycle in the whole country; 3) The battery is aged.
SUMMERY OF THE UTILITY MODEL
To the problem pointed out in the background art, the utility model provides a direct current charging protection device that electric bicycle charges usefulness.
A DC charging protection device for charging an electric bicycle comprises a power supply circuit, a logic control circuit, a signal sampling circuit, an indicating circuit, a driving circuit and a DC switch circuit; the power supply circuit is electrically connected with the charger; the input end of the signal sampling circuit is electrically connected with the charger and the storage battery, and the output end of the signal sampling circuit is electrically connected with the input end of the logic control circuit; the output end of the logic control circuit is electrically connected with the driving circuit, and the driving circuit is electrically connected with the direct current switch circuit; and the input end and the output end of the direct current switch circuit are electrically connected with the charger and the storage battery respectively.
According to the utility model discloses an embodiment, logic control circuit includes control chip U1.
According to the utility model discloses an embodiment, supply circuit includes zener diode U2, resistance R16, electric capacity C6, rectifier diode D3, rectifier diode D2, inductance L1, resistance R17 and electric capacity C8.
According to an embodiment of the present invention, the signal sampling circuit includes a charger voltage sampling circuit, a storage battery voltage sampling circuit, a charging current sampling circuit, and a temperature sampling circuit; the charger voltage sampling circuit comprises a DC + input end and a DCV output end, the DC + input end is connected with the charger, the DCV output end is connected with the logic control circuit, the DC + input end is grounded through a resistor R7 and a resistor R11, two ends of the resistor R11 are connected in parallel with a capacitor C3, and a connection point between the resistor R7 and the resistor R11 is set as the DCV output end; the storage battery voltage sampling circuit comprises a BAT + input end and a BATV output end, the BAT + input end is connected with the anode of the storage battery, the BATV output end is connected with the logic control circuit, the BAT + input end is grounded through a resistor R8 and a resistor R12, two ends of the resistor R12 are connected in parallel with a capacitor C4, and a connection point between the resistor R8 and the resistor R12 is set as the BATV output end; the charging current sampling circuit comprises a BAT-input end and a DCI output end, the BAT-input end is connected with the cathode of the storage battery, the DCI output end is connected with the logic control circuit, the BAT-input end is grounded through a resistor R9 and a resistor R13, two ends of the resistor R13 are connected in parallel with a capacitor C5, and a connection point between the resistor R9 and the resistor R13 is set as the DCI output end; the temperature sampling circuit comprises a Tadc output end, a thermistor RT and a resistor R20, the Tadc output end is connected with the logic control circuit, and two ends of the thermistor RT and the resistor R20 are respectively connected with rated voltage and grounded.
According to the utility model discloses an embodiment, drive circuit includes triode Q3 and triode Q4, triode Q3 and triode Q4 base between them all with logic control circuit is connected, and triode Q3 and triode Q4 projecting pole between them all ground connection.
According to an embodiment of the present invention, the dc switch circuit includes an MOS transistor Q1 and an MOS transistor Q2, drains of the MOS transistor Q1 and the MOS transistor Q2 are connected, a gate of the MOS transistor Q1 is connected to a collector of the transistor Q3 through a resistor R4, and a gate of the MOS transistor Q2 is connected to a collector of the transistor Q3 through a resistor R5; a resistor R1 is connected between the grid electrode and the source electrode of the MOS tube Q1, and the source electrode of the MOS tube Q1 is connected with a charger; a resistor R2 is connected between the grid electrode and the source electrode of the MOS tube Q2, and the source electrode of the MOS tube Q2 is connected with the anode of the storage battery; a resistor R14 and a resistor R15 are connected between the emitting electrode of the triode Q4 and the negative electrode of the storage battery, and the resistor R14 and the resistor R15 are connected in parallel.
According to the utility model discloses an embodiment, indicating circuit includes green pilot lamp and red pilot lamp, green pilot lamp through resistance R18 with logic control circuit is connected, red pilot lamp through resistance R19 with logic control circuit is connected.
According to the utility model discloses an embodiment, logic control circuit is connected with communication module.
To sum up, the beneficial effects of the utility model are that:
1. the charger is provided with a power supply circuit, a logic control circuit, a signal sampling circuit, an indicating circuit, a driving circuit, a direct current switch circuit and a communication module, wherein the power supply circuit converts high-voltage direct current output by the charger into a 5V direct current power supply to be supplied to an MCU and the indicating circuit for use. The signal sampling circuit collects the output voltage value of the charger, the voltage value of the storage battery, the current value when the battery is charged, the environmental temperature value and the like, and sends the values to the MCU; the MCU drives the indicating circuit and the driving circuit according to the set logic, and the driving circuit drives the direct current switch circuit to be conducted;
2. the communication module is arranged, and data can be sent to a mobile phone or a cloud platform in Bluetooth, WIFI or IoT communication modes for remote management
3. The overcharge can be detected, and when the battery is fully charged, the direct-current power supply is automatically cut off;
4. the capacity and the defects of the storage battery can be detected;
5. the fault of the alternating current charger and the connection condition of the alternating current power supply circuit can be detected, and alarm management and protection are performed;
6. the matching between the charger and the storage battery is automatically calculated, and an automatic alarm is given under the condition of using a wrong charger (a high-voltage charger is used for charging a low-voltage battery, and a low-voltage charger is used for charging a high-voltage battery);
7. the product can be directly connected with the direct current output end of the original charger in series, the use is simple and convenient, and any structure of the charger and the electric vehicle is not required to be changed;
8. the product can be independently formed into a module product and can also be integrated into a charger.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention;
FIG. 2 is a circuit diagram of an embodiment of the present invention;
fig. 3 is a connection diagram of a logic control circuit according to an embodiment of the present invention;
fig. 4 is a connection diagram of a power supply circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a signal sampling circuit according to an embodiment of the present invention;
fig. 6 is a connection diagram of a driving circuit in an embodiment of the present invention;
fig. 7 is a circuit diagram of a dc switch according to an embodiment of the present invention;
fig. 8 is a connection diagram of an indicating circuit according to an embodiment of the present invention.
Detailed Description
Please refer to fig. 1 to 8. It should be understood that the structures, ratios, sizes, etc. shown in the drawings and attached to the description are only for understanding and reading the disclosure of the present invention, and are not intended to limit the practical conditions of the present invention, so that the present invention has no technical significance, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical contents of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are used for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial change in the technical content.
First, the design of the present invention is as original as follows: the electric motor car among the prior art has too much charging, long-term high temperature to lead to the battery to catch fire, the battery is ageing when the charger charges for the battery, in order to solve above-mentioned problem, the utility model provides a direct current charging protection device's that electric bicycle charges usefulness embodiment.
A dc charging protection device for charging an electric bicycle, as shown in fig. 1 and 2, comprises a power supply circuit, a logic control circuit, a signal sampling circuit, an indication circuit, a driving circuit and a dc switch circuit.
The power supply circuit is electrically connected with the charger and is used for converting high-voltage direct current output by the charger into 5V direct current.
The input end of the signal sampling circuit is electrically connected with the charger and the storage battery, and the output end of the signal sampling circuit is electrically connected with the input end of the logic control circuit. The signal sampling circuit is used for detecting the voltage of the charger, the voltage of the storage battery, the charging current and the temperature.
The output end of the logic control circuit is electrically connected with the driving circuit, the driving circuit is electrically connected with the direct current switch circuit, and the driving circuit is used for driving the switch of the direct current switch circuit. The output end of the logic control circuit is also connected with the indicating circuit and is used for indicating the working state and giving an alarm.
The input end and the output end of the direct current switch circuit are electrically connected with the charger and the storage battery respectively. When the direct current switch circuit is in a turn-off state, the charger does not charge the storage battery; when the direct current switch circuit is in a connected state, the charger charges the storage battery.
Furthermore, the logic control circuit is connected with a communication module, and the communication module can send data to a mobile phone or a cloud platform in a Bluetooth, WIFI or IoT communication mode for remote management.
In conclusion, the power supply circuit converts the high-voltage direct current output by the charger into a 5V direct current power supply to be supplied to the MCU and the indicating circuit for use. The signal sampling circuit collects an output voltage value of the charger, a voltage value of the storage battery, a current value when the battery is charged, an environmental temperature value and the like, and sends the values to the MCU; the MCU drives the indicating circuit and the driving circuit according to the set logic, and the driving circuit drives the direct current switch circuit to be conducted. The communication module can send data to a mobile phone or a cloud platform in a Bluetooth, WIFI or IoT communication mode for remote management.
As shown in fig. 3, the logic control circuit includes a control chip U1, and the control chip U1 includes 28 pins. D1 is a voltage stabilizing protection tube for preventing over-high voltage.
As shown in fig. 4, the power supply circuit includes a zener diode U2, a resistor R16, a capacitor C6, a rectifier diode D3, a rectifier diode D2, an inductor L1, a resistor R17, and a capacitor C8. The high-voltage direct current output by the charger is converted into a 5V direct current power supply to be supplied to a logic control circuit and an indicating circuit for use.
As shown in fig. 5, the signal sampling circuit includes a charger voltage sampling circuit, a storage battery voltage sampling circuit, a charging current sampling circuit, and a temperature sampling circuit.
The charger voltage sampling circuit includes a DC + input terminal and a DCV output terminal. The DC + input end is connected with the charger; the DCV output end is connected with the logic control circuit, and the numerical value of the DCV output end is a charger voltage sampling value; the DC + input end is grounded through a resistor R7 and a resistor R11, two ends of the resistor R11 are connected with a capacitor C3 in parallel, and a connection point between the resistor R7 and the resistor R11 is set as a DCV output end.
The storage battery voltage sampling circuit comprises a BAT + input end and a BATV output end. The BAT + input end is connected with the anode of the storage battery; the BATV output end is connected with the logic control circuit, and the value of the BATV output end is the voltage value of the storage battery. The BAT + input end is grounded through a resistor R8 and a resistor R12, two ends of the resistor R12 are connected with a capacitor C4 in parallel, and a connection point between the resistor R8 and the resistor R12 is set as a BATV output end;
the charging current sampling circuit comprises a BAT-input end and a DCI output end. The BAT-input end is connected with the negative electrode of the storage battery; the DCI output end is connected with the logic control circuit, and the numerical value of the DCI output end is the charging current value. The BAT-input end is grounded through a resistor R9 and a resistor R13, two ends of the resistor R13 are connected with a capacitor C5 in parallel, and a connection point between the resistor R9 and the resistor R13 is set as a DCI output end;
the temperature sampling circuit comprises a Tadc output end, a thermistor RT and a resistor R20, wherein the Tadc output end is connected with the logic control circuit, and the numerical value of the Tadc output end is a temperature value. Both ends of the thermistor RT and the resistor R20 are respectively connected with rated voltage and grounding.
As shown in fig. 6, the driving circuit includes a transistor Q3 and a transistor Q4, bases of the transistor Q3 and the transistor Q4 are both connected to the logic control circuit, and emitters of the transistor Q3 and the transistor Q4 are both grounded. Transistor Q3 and transistor Q4 act as two drive switches.
As shown in fig. 7, the dc switching circuit includes a MOS transistor Q1 and a MOS transistor Q2, drains (d-poles) of the MOS transistor Q1 and the MOS transistor Q2 are connected, a gate of the MOS transistor Q1 is connected to a collector of the transistor Q3 through a resistor R4, and a gate of the MOS transistor Q2 is connected to a collector of the transistor Q3 through a resistor R5.
A resistor R1 is connected between a grid electrode (G pole) and a source electrode (S pole) of the MOS tube Q1, and the source electrode of the MOS tube Q1 is connected with a charger.
A resistor R2 is connected between the grid electrode and the source electrode of the MOS tube Q2, and the source electrode of the MOS tube Q2 is connected with the anode of the storage battery.
A resistor R14 and a resistor R15 are connected between the emitting electrode of the triode Q4 and the negative electrode of the storage battery, and the resistor R14 and the resistor R15 are connected in parallel.
The MOS power tube Q1 and the MOS power tube Q2 are MOS power tubes with P-type channels, the MOS power tubes are switched off when the voltage at two ends of a grid electrode (G pole) and a source electrode (S pole) is 0, and the MOS power tubes are switched on when the voltage at two ends of the grid electrode (G pole) and the source electrode (S pole) is-10V. Under the condition of turn-off, the charger and the storage battery are not influenced mutually.
As shown in fig. 8, the indicating circuit includes a green indicating lamp and a red indicating lamp, the green indicating lamp is connected with the logic control circuit through a resistor R18, and the red indicating lamp is connected with the logic control circuit through a resistor R19.
The working process of the present invention will be further described below:
after the charger and the storage battery are connected, the voltages of the storage battery and the charger are detected firstly, and whether the voltages are matched is judged. When the detection matching is normal, the average charging voltage and the floating charging voltage of the storage battery are set according to the current environmental temperature, and then the direct current switch circuit is started to detect the charging current value. And preliminarily judging the conditions of the storage battery and a charging loop according to the initial value of the storage battery, the voltage value of the storage battery after a certain time interval and the charging current value. When the data is abnormal, the switch can be turned off firstly, and after the data is stood for a certain time, the terminal voltage of the electric storage is detected, so that the quality of the battery can be accurately judged. When the charging of the charger exceeds or is lower than a set value, the alarm is displayed. And when the charging time is different from the data calculated by theory, an alarm is given. When the high-frequency ripple of the direct-current voltage is detected to be large, the charger is judged to have a fault hidden trouble; when the charging current fluctuation is detected frequently, the charger can be judged to be poor in contact with an alternating current access line and a contact, and a direct current loop is closed and an alarm is given.
In summary, in the present embodiment, the power supply circuit, the logic control circuit, the signal sampling circuit, the indication circuit, the driving circuit, the dc switch circuit, and the communication module are provided, wherein the power supply circuit converts the high voltage dc output by the charger into a 5V dc power supply, which is supplied to the MCU and the indication circuit. The signal sampling circuit collects an output voltage value of the charger, a voltage value of the storage battery, a current value when the battery is charged, an environmental temperature value and the like, and sends the values to the MCU; the MCU drives the indicating circuit and the driving circuit according to the set logic, and the driving circuit drives the direct current switch circuit to be conducted. The communication module is arranged, and data can be sent to a mobile phone or a cloud platform in Bluetooth, WIFI or IoT communication modes for remote management. The overcharge can be detected, and when the battery is fully charged, the direct-current power supply is automatically cut off; the capacity and the defects of the storage battery can be detected; the fault of the alternating current charger and the connection condition of the alternating current power supply circuit can be detected, and alarm management and protection are performed; the matching between the charger and the storage battery is automatically calculated, and an automatic alarm is given under the condition of using a wrong charger (a high-voltage charger is used for charging at low voltage); the product can be directly connected with the direct current output end of the original charger in series, the use is simple and convenient, and any structure of the charger and the electric vehicle is not required to be changed; finally, the product can be formed into a module product independently, and can also be integrated into a charger.
The above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. A DC charging protection device for charging an electric bicycle is characterized in that,
the charger comprises a power supply circuit, a logic control circuit, a signal sampling circuit, an indicating circuit, a driving circuit and a direct current switch circuit, wherein the power supply circuit is electrically connected with the charger, the input end of the signal sampling circuit is electrically connected with the charger and a storage battery, the output end of the signal sampling circuit is electrically connected with the input end of the logic control circuit, the output end of the logic control circuit is electrically connected with the driving circuit, the driving circuit is electrically connected with the direct current switch circuit, and the input end and the output end of the direct current switch circuit are respectively electrically connected with the charger and the storage battery;
the logic control circuit comprises a control chip U1, and the power supply circuit comprises a voltage stabilizing diode U2, a resistor R16, a capacitor C6, a rectifier diode D3, a rectifier diode D2, an inductor L1, a resistor R17 and a capacitor C8; the signal sampling circuit comprises a charger voltage sampling circuit, a storage battery voltage sampling circuit, a charging current sampling circuit and a temperature sampling circuit, wherein the charger voltage sampling circuit comprises a DC + input end and a DCV output end, the DC + input end is connected with the charger, the DCV output end is connected with the logic control circuit, the DC + input end is grounded through a resistor R7 and a resistor R11, two ends of the resistor R11 are connected with a capacitor C3 in parallel, and a connection point between the resistor R7 and the resistor R11 is set as a DCV output end;
the storage battery voltage sampling circuit comprises a BAT + input end and a BATV output end, the BAT + input end is connected with the positive electrode of a storage battery, the BATV output end is connected with the logic control circuit, the BAT + input end is grounded through a resistor R8 and a resistor R12, two ends of the resistor R12 are connected in parallel with a capacitor C4, a connection point between the resistor R8 and the resistor R12 is set as the BATV output end, the charging current sampling circuit comprises a BAT-input end and a DCI output end, the BAT-input end is connected with the negative electrode of the storage battery, the DCI output end is connected with the logic control circuit, the BAT-input end is grounded through a resistor R9 and a resistor R13, two ends of the resistor R13 are connected in parallel with a capacitor C5, a connection point between the resistor R9 and the resistor R13 is set as the DCI output end, the temperature sampling circuit comprises a Tadc output end, a thermistor RT and a resistor R20, the Tadc output end is connected with the logic control circuit, and two ends of the thermistor RT and the resistor R20 are respectively connected with rated voltage and grounded.
2. The dc charging protection device for charging electric bicycle according to claim 1, wherein said driving circuit comprises a transistor Q3 and a transistor Q4, the base electrodes of the transistor Q3 and the transistor Q4 are connected to said logic control circuit, and the emitter electrodes of the transistor Q3 and the transistor Q4 are grounded.
3. The dc charging protection device for charging an electric bicycle according to claim 2, wherein the dc switching circuit comprises a MOS transistor Q1 and a MOS transistor Q2, drains of the MOS transistor Q1 and the MOS transistor Q2 are connected, a gate of the MOS transistor Q1 is connected to a collector of a transistor Q3 through a resistor R4, and a gate of the MOS transistor Q2 is connected to a collector of the transistor Q3 through a resistor R5;
a resistor R1 is connected between the grid electrode and the source electrode of the MOS tube Q1, and the source electrode of the MOS tube Q1 is connected with the charger;
a resistor R2 is connected between the grid electrode and the source electrode of the MOS tube Q2, and the source electrode of the MOS tube Q2 is connected with the anode of the storage battery;
a resistor R14 and a resistor R15 are connected between the emitting electrode of the triode Q4 and the negative electrode of the storage battery, and the resistor R14 and the resistor R15 are connected in parallel.
4. The dc charging protection device for charging an electric bicycle according to claim 1, wherein the indicating circuit comprises a green indicating lamp and a red indicating lamp, the green indicating lamp is connected to the logic control circuit through a resistor R18, and the red indicating lamp is connected to the logic control circuit through a resistor R19.
5. The direct-current charging protection device for charging the electric bicycle according to claim 1, wherein a communication module is connected to the logic control circuit.
CN202221356431.8U 2022-06-01 2022-06-01 Direct current charging protection device for charging electric bicycle Active CN218040825U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221356431.8U CN218040825U (en) 2022-06-01 2022-06-01 Direct current charging protection device for charging electric bicycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221356431.8U CN218040825U (en) 2022-06-01 2022-06-01 Direct current charging protection device for charging electric bicycle

Publications (1)

Publication Number Publication Date
CN218040825U true CN218040825U (en) 2022-12-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221356431.8U Active CN218040825U (en) 2022-06-01 2022-06-01 Direct current charging protection device for charging electric bicycle

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