CN220586017U - Modularized cluster control energy storage converter - Google Patents
Modularized cluster control energy storage converter Download PDFInfo
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- CN220586017U CN220586017U CN202322178210.7U CN202322178210U CN220586017U CN 220586017 U CN220586017 U CN 220586017U CN 202322178210 U CN202322178210 U CN 202322178210U CN 220586017 U CN220586017 U CN 220586017U
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- 238000004146 energy storage Methods 0.000 title claims abstract description 22
- 230000000087 stabilizing effect Effects 0.000 claims description 25
- 239000003990 capacitor Substances 0.000 claims description 23
- 238000001914 filtration Methods 0.000 claims description 12
- 238000007599 discharging Methods 0.000 description 5
- 230000005669 field effect Effects 0.000 description 4
- 230000006698 induction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
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Abstract
The utility model relates to the technical field of energy storage converters and provides a modularized cluster control energy storage converter which comprises a charging circuit, wherein the charging circuit comprises a switching tube Q1, a transformer T1, a resistor R7, a resistor R8, a switching tube Q3, a switching tube Q4 and a resistor R9, a first input end of the transformer T1 is connected with a power supply, a second input end of the transformer T1 is connected with a first end of the switching tube Q1, a first output end of the transformer T1 is connected with a first end of the switching tube Q3 through the resistor R7, a first output end of the transformer T1 is connected with a first end of the switching tube Q4 through the resistor R8, a second output end of the transformer T1 is grounded, a control end of the switching tube Q3 is connected with a control end of the switching tube Q4, a second end of the switching tube Q3 is connected with an anode of a storage battery BT1, and a control end of the switching tube Q4 is grounded through the resistor R9. Through the technical scheme, the problem that the current of the energy storage converter is unstable when the storage battery is charged in the related art is solved.
Description
Technical Field
The utility model relates to the technical field of energy storage converters, in particular to a modularized cluster control energy storage converter.
Background
A modular cluster-controlled energy storage converter is a power conversion device capable of converting electrical energy into an energy storage form, which can control the charging and discharging processes of a battery, and can store electrical energy into the battery for release when needed. However, the existing energy storage converter has the problem that the current is unstable when the storage battery is charged, and the service life of the storage battery is influenced.
Disclosure of Invention
The utility model provides a modularized cluster control energy storage converter, which solves the problem that the current of the energy storage converter is unstable when a storage battery is charged in the related art.
The technical scheme of the utility model is as follows:
the modularized cluster control energy storage converter comprises a storage battery BT1, wherein the storage battery BT1 is used for storing electric energy, the modularized cluster control energy storage converter also comprises a charging circuit and a rectifying and filtering circuit, the input end of the rectifying and filtering circuit is connected with a power grid, the output end of the rectifying and filtering circuit is connected with the input end of the charging circuit, the output end of the charging circuit is connected with the storage battery BT1, the charging circuit comprises a resistor R4, a resistor R5, a switch tube Q1, a transformer T1, a resistor R7, a resistor R8, a switch tube Q3, a switch tube Q4 and a resistor R9,
the first end of the resistor R4 is connected with the output end of the rectifying and filtering circuit, the second end of the resistor R4 is grounded through the resistor R5, the second end of the resistor R4 is connected with the control end of the switching tube Q1, the first input end of the transformer T1 is connected with the first end of the resistor R4, the second input end of the transformer T1 is connected with the first end of the switching tube Q1, the second end of the switching tube Q1 is grounded,
the first output end of the transformer T1 is connected with the first end of the switch tube Q3 through the resistor R7, the first output end of the transformer T1 is connected with the first end of the switch tube Q4 through the resistor R8, the second output end of the transformer T1 is grounded, the control end of the switch tube Q3 is connected with the control end of the switch tube Q4, the second end of the switch tube Q3 is connected with the positive electrode of the storage battery BT1, the control end of the switch tube Q4 is connected with the second end of the switch tube Q4, the control end of the switch tube Q4 is grounded through the resistor R9, and the negative electrode of the storage battery BT1 is grounded.
Further, the charging circuit in the present utility model further includes a resistor R2, a capacitor C3, and a diode D2, where a first end of the resistor R2 is connected to the first input end of the transformer T1, a second end of the resistor R2 is connected to the cathode of the diode D2, an anode of the diode D2 is connected to the first end of the switching tube Q1, and the capacitor C3 is connected in parallel to two ends of the resistor R2.
Further, the charging circuit in the present utility model further includes a resistor R6, a varistor RP1, a capacitor C4, and a switching tube Q2, where a first end of the resistor R6 is connected to a first end of the feedback coil of the transformer T1, a second end of the feedback coil of the transformer T1 is grounded, a second end of the resistor R6 is connected to the first end of the varistor RP1, a second end of the varistor RP1 is connected to a control end of the switching tube Q2, a sliding end of the varistor RP1 is grounded through the capacitor C4, a first end of the switching tube Q2 is connected to a control end of the switching tube Q1, and a second end of the switching tube Q2 is grounded.
Further, the utility model also comprises an overcharge protection circuit, wherein the overcharge protection circuit comprises a resistor R10, a voltage stabilizing tube D4 and an optocoupler U2, a first end of the resistor R10 is connected with the positive electrode of the storage battery BT1, a second end of the resistor R10 is connected with the cathode of the voltage stabilizing tube D4, the anode of the voltage stabilizing tube D4 is connected with the first input end of the optocoupler U2, the second input end of the optocoupler U2 is grounded, the first output end of the optocoupler U2 is connected with the control end of the switching tube Q1, and the second output end of the optocoupler U2 is grounded.
Further, the utility model further comprises an over-discharge protection circuit, the over-discharge protection circuit comprises a resistor R11, a voltage stabilizing tube D5, a resistor R12, a resistor R13, an operational amplifier U1, a resistor R14, a switching tube Q5, a resistor R15 and a switching tube Q6, wherein a first end of the resistor R11 is connected with the positive electrode of the storage battery BT1, a second end of the resistor R11 is connected with the cathode of the voltage stabilizing tube D5, the anode of the voltage stabilizing tube D5 is grounded, the cathode of the voltage stabilizing tube D5 is connected with the inverting input end of the operational amplifier U1, a first end of the resistor R12 is connected with the positive electrode of the storage battery BT1, a second end of the resistor R12 is grounded through the resistor R13, a second end of the resistor R12 is connected with the non-inverting input end of the operational amplifier U1, an output end of the operational amplifier U1 is connected with the control end of the switching tube Q5 through the resistor R14, a first end of the switching tube Q5 is connected with the control end of the switching tube Q6 through the resistor R15, and a second end of the switching tube Q6 is connected with the positive end of the switching tube Q6.
The working principle and the beneficial effects of the utility model are as follows:
in the present utility model, the charging voltage of the battery BT1 should be dc, so the rectifying and filtering circuit rectifies and filters the ac voltage of the power grid into dc voltage, and the dc voltage charges the battery BT1 after passing through the charging circuit.
Specifically, the working principle of the charging circuit is as follows: the resistor R4 and the resistor R5 form a voltage dividing circuit, after the direct current after rectification and filtration is divided, the voltage on the resistor R5 is taken to be added to the control end of the switching tube Q1, the switching tube Q1 is conducted, the direct current voltage is simultaneously added to the first input end of the transformer T1, when the switching tube Q1 is conducted, an electric signal is generated in the coil of the input end of the transformer T1, meanwhile, an induction voltage is generated in the coil of the output end of the transformer T1, the induction voltage is respectively added to the first ends of the switching tube Q3 and the switching tube Q4, the switching tube Q3 and the switching tube Q4 are conducted simultaneously, and the first output end of the transformer T1 outputs direct current to charge the storage battery BT 1. In the charging process, if the charging current of the storage battery BT1 is increased, the voltage on the resistor R9 is transformed, and the current of the control end of the switching tube Q3 is increased, so that the current output by the first output end of the transformer T1 is reduced; if the charging current of the battery BT1 is reduced, the voltage on the resistor R9 is reduced, and the current of the control end of the switch tube Q3 is reduced, so that the current output by the first output end of the transformer T1 is increased, the charging current of the battery BT1 is ensured to be in a stable state, and the service life of the battery BT1 is prolonged.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a circuit diagram of a charging circuit according to the present utility model;
FIG. 2 is a circuit diagram of an overcharge protection circuit of the present utility model;
fig. 3 is a circuit diagram of the over-discharge protection circuit in the present utility model.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, this embodiment provides a modularized cluster control energy storage converter, including battery BT1, battery BT1 is used for storing the electric energy, still include charging circuit and rectifying filter circuit, rectifying filter circuit's input terminal is connected to the electric wire netting, charging circuit's input is connected to rectifying filter circuit's output, charging circuit's output is connected battery BT1, charging circuit includes resistance R4, resistance R5, switch tube Q1, transformer T1, resistance R7, resistance R8, switch tube Q3, switch tube Q4 and resistance R9, the output of rectifying filter circuit is connected to resistance R4's first end, the second end of resistance R4 is connected to the control end of switch tube Q1 through resistance R5, the first end of transformer T1 is connected to the first end of resistance R4, the first end of switch tube Q1 is connected to the second end of switch tube Q1 through resistance R7, the first end of switch tube Q1 is connected to the second end of switch tube Q4 is connected to the positive electrode Q4, the second end of switch tube Q4 is connected to the control end of switch tube Q4 is connected to the positive electrode Q4.
In this embodiment, the charging voltage of the battery BT1 should be dc, so the rectifying and filtering circuit rectifies and filters the ac voltage of the power grid into dc voltage, and the dc voltage charges the battery BT1 after passing through the charging circuit.
Specifically, the working principle of the charging circuit is as follows: the resistor R4 and the resistor R5 form a voltage dividing circuit, after the direct current after rectification and filtration is divided, the voltage on the resistor R5 is taken to be added to the control end of the switching tube Q1, the switching tube Q1 is conducted, the direct current voltage is simultaneously added to the first input end of the transformer T1, when the switching tube Q1 is conducted, an electric signal is generated in the coil of the input end of the transformer T1, meanwhile, an induction voltage is generated in the coil of the output end of the transformer T1, the induction voltage is respectively added to the first ends of the switching tube Q3 and the switching tube Q4, the switching tube Q3 and the switching tube Q4 are conducted simultaneously, and the first output end of the transformer T1 outputs direct current to charge the storage battery BT 1. In the charging process, if the charging current of the storage battery BT1 is increased, the voltage on the resistor R9 is transformed, and the current of the control end of the switching tube Q3 is increased, so that the current output by the first output end of the transformer T1 is reduced; if the charging current of the battery BT1 is reduced, the voltage on the resistor R9 is reduced, and the current of the control end of the switch tube Q3 is reduced, so that the current output by the first output end of the transformer T1 is increased, the charging current of the battery BT1 is ensured to be in a stable state, and the service life of the battery BT1 is prolonged.
The rectification filter circuit is composed of a rectification bridge D1, a capacitor C1, a resistor R1 and a capacitor C2, wherein the rectification bridge D1 plays a role in rectification, the capacitor C1, the resistor R1 and the capacitor C2 form a filter circuit, and the power grid alternating current is changed into a direct current signal after rectification and filter treatment.
In the embodiment, an N-channel enhancement type field effect transistor is adopted as a switching tube Q1, a gate of the N-channel enhancement type field effect transistor is adopted as a control end of the switching tube Q1, a drain of the N-channel enhancement type field effect transistor is adopted as a first end of the switching tube Q1, and a source of the N-channel enhancement type field effect transistor is adopted as a second end of the switching tube Q1; PNP type triode is adopted as a switch tube Q3 and a switch tube Q4, the base electrode of the PNP type triode is adopted as the control ends of the switch tube Q3 and the switch tube Q4, the emitter electrode of the PNP type triode is adopted as the first ends of the switch tube Q3 and the switch tube Q4, and the collector electrode of the PNP type triode is adopted as the second ends of the switch tube Q3 and the switch tube Q4.
As shown in fig. 1, the charging circuit in this embodiment further includes a resistor R2, a capacitor C3, and a diode D2, wherein a first end of the resistor R2 is connected to a first input end of the transformer T1, a second end of the resistor R2 is connected to a cathode of the diode D2, an anode of the diode D2 is connected to a first end of the switching tube Q1, and the capacitor C3 is connected in parallel to two ends of the resistor R2.
In this embodiment, the resistor R2, the capacitor C3 and the diode D2 form an absorption loop, so as to reduce spike pulse on the switching tube Q1, prevent overvoltage damage when the switching tube Q1 is turned off, and play a good role in protecting the switching tube Q1.
As shown in fig. 1, the charging circuit in this embodiment further includes a resistor R6, a varistor RP1, a capacitor C4, and a switching tube Q2, where a first end of the resistor R6 is connected to a first end of a feedback coil of the transformer T1, a second end of the feedback coil of the transformer T1 is grounded, a second end of the resistor R6 is connected to the first end of the varistor RP1, a second end of the varistor RP1 is connected to a control end of the switching tube Q2, a sliding end of the varistor RP1 is grounded through the capacitor C4, a first end of the switching tube Q2 is connected to a control end of the switching tube Q1, and a second end of the switching tube Q2 is grounded.
In this embodiment, the battery BT1 can ensure that the charging current is stable and unchanged during charging, and the charging current is continuous, so that the charging current of the battery BT1 is excessive as a whole, and the charging mode can fully charge the battery BT1 in a relatively short time, but the service life of the battery BT1 is also affected after a long time. Therefore, in this embodiment, an oscillation circuit is added, and the oscillation circuit is composed of a resistor R6, a varistor RP1, a capacitor C4, a switching tube Q2, and a feedback coil of a transformer T1.
During charging, an induced voltage is also generated in the feedback coil of the transformer T1, the voltage charges the capacitor C4 through the resistor R6 and the rheostat RP1, the switching tube Q2 is turned off during charging, the switching tube Q1 is turned on, the storage battery BT1 is charged, when the charging voltage of the capacitor C4 is higher than the conducting voltage of the switching tube Q2, the switching tube Q2 is turned on, the control end of the switching tube Q1 is grounded, the switching tube Q1 is turned off, no current passes through the input coil of the transformer T1, no induced voltage exists at the output end of the transformer T1, the storage battery BT1 stops charging, the switching tube Q2 is turned off after the discharging of the capacitor C4 is finished, the control end of the switching tube Q1 is changed to be at a high level again, the storage battery BT1 is in a charged state again at the same time, and the switching tube Q2 is turned on again until the charging voltage is higher than the conducting voltage of the switching tube Q2, and circulation is formed. In this way, the average charging current of the battery BT1 can be reduced, and the charging/discharging time of the capacitor C4 can be changed by changing the values of the capacitor C4 and the varistor RP1, thereby changing the charging current of the battery BT 1.
As shown in fig. 2, the embodiment further includes an overcharge protection circuit, where the overcharge protection circuit includes a resistor R10, a voltage stabilizing tube D4 and an optocoupler U2, a first end of the resistor R10 is connected to an anode of the battery BT1, a second end of the resistor R10 is connected to a cathode of the voltage stabilizing tube D4, an anode of the voltage stabilizing tube D4 is connected to a first input end of the optocoupler U2, a second input end of the optocoupler U2 is grounded, a first output end of the optocoupler U2 is connected to a control end of the switching tube Q1, and a second output end of the optocoupler U2 is grounded.
When the battery BT1 is fully charged, the charging circuit should be disconnected, otherwise, the battery BT1 will be overcharged, and long-term overcharging of the battery BT1 will cause a swelling phenomenon, which seriously affects the normal use of the battery, so that the battery BT1 needs to be overcharged for protection.
When the electric quantity of the storage battery BT1 is lower than a set value, the voltage stabilizing tube D4 plays a role in stabilizing voltage, the optocoupler U2 is not conducted, and the storage battery BT1 is normally charged; when the electric quantity of the storage battery BT1 exceeds a set value, the voltage stabilizing tube D4 breaks down and is conducted, so that the optocoupler U2 is conducted, the first output end of the optocoupler U2 becomes low level, the control end of the switching tube Q1 is pulled down, the switching tube Q1 is cut off, the charging circuit does not work any more, and the storage battery BT1 stops being charged.
As shown in fig. 3, the embodiment further includes an over-discharge protection circuit, where the over-discharge protection circuit includes a resistor R11, a voltage stabilizing tube D5, a resistor R12, a resistor R13, an operational amplifier U1, a resistor R14, a switching tube Q5, a resistor R15, and a switching tube Q6, a first end of the resistor R11 is connected to the positive electrode of the battery BT1, a second end of the resistor R11 is connected to the cathode of the voltage stabilizing tube D5, the anode of the voltage stabilizing tube D5 is grounded, a cathode of the voltage stabilizing tube D5 is connected to the inverting input end of the operational amplifier U1, a first end of the resistor R12 is connected to the positive electrode of the battery BT1, a second end of the resistor R12 is grounded through the resistor R13, an output end of the operational amplifier U1 is connected to the control end of the switching tube Q5 through the resistor R14, a first end of the switching tube Q5 is connected to the control end of the switching tube Q6, a second end of the switching tube Q5 is grounded, and a first end of the switching tube Q6 is connected to the positive electrode of the battery BT1, and a second end of the switching tube Q6 is used as a power supply end.
The modular cluster-control energy storage converter is a power conversion device capable of converting electric energy into an energy storage form, and can control the charging and discharging processes of the storage battery BT1, and can store electric energy into the storage battery BT1 so as to be released when required. If the battery BT1 is overdischarged, the battery BT1 is also adversely affected, and for this reason, the battery BT1 is overdischarged protected.
The voltage of the storage battery BT1 is stabilized by a resistor R11 and a voltage stabilizing tube D5 and then is used as a reference voltage to be added to an inverting input end of the operational amplifier U1, a voltage dividing circuit is formed by the resistor R12 and the resistor R13 and is used for collecting the residual electric quantity of the storage battery BT1 in real time, the residual electric quantity of the storage battery BT1 is added to an non-inverting input end of the operational amplifier U1, the operational amplifier U1 forms a comparator, when the residual electric quantity of the storage battery BT1 is higher than a set value, the operational amplifier U1 outputs a high-level signal, a switching tube Q5 is conducted, a switching tube Q6 is also conducted, and the storage battery BT1 can normally output; when the residual electric quantity of the storage battery BT1 is lower than a set value, the operational amplifier U1 outputs a low-level signal, the switching tube Q5 is cut off, the switching tube Q6 is also cut off, a discharging loop of the storage battery BT1 is disconnected, and the storage battery BT1 is prevented from being over-discharged.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (5)
1. The modularized cluster control energy storage converter comprises a storage battery BT1, wherein the storage battery BT1 is used for storing electric energy, and is characterized by further comprising a charging circuit and a rectifying and filtering circuit, wherein the input end of the rectifying and filtering circuit is connected with a power grid, the output end of the rectifying and filtering circuit is connected with the input end of the charging circuit, the output end of the charging circuit is connected with the storage battery BT1, the charging circuit comprises a resistor R4, a resistor R5, a switching tube Q1, a transformer T1, a resistor R7, a resistor R8, a switching tube Q3, a switching tube Q4 and a resistor R9,
the first end of the resistor R4 is connected with the output end of the rectifying and filtering circuit, the second end of the resistor R4 is grounded through the resistor R5, the second end of the resistor R4 is connected with the control end of the switching tube Q1, the first input end of the transformer T1 is connected with the first end of the resistor R4, the second input end of the transformer T1 is connected with the first end of the switching tube Q1, the second end of the switching tube Q1 is grounded,
the first output end of the transformer T1 is connected with the first end of the switch tube Q3 through the resistor R7, the first output end of the transformer T1 is connected with the first end of the switch tube Q4 through the resistor R8, the second output end of the transformer T1 is grounded, the control end of the switch tube Q3 is connected with the control end of the switch tube Q4, the second end of the switch tube Q3 is connected with the positive electrode of the storage battery BT1, the control end of the switch tube Q4 is connected with the second end of the switch tube Q4, the control end of the switch tube Q4 is grounded through the resistor R9, and the negative electrode of the storage battery BT1 is grounded.
2. The modular cluster-controlled energy storage converter of claim 1, wherein the charging circuit further comprises a resistor R2, a capacitor C3 and a diode D2, the first end of the resistor R2 is connected to the first input end of the transformer T1, the second end of the resistor R2 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to the first end of the switching tube Q1, and the capacitor C3 is connected in parallel to two ends of the resistor R2.
3. The modular cluster-controlled energy storage converter of claim 1, wherein the charging circuit further comprises a resistor R6, a varistor RP1, a capacitor C4 and a switching tube Q2, the first end of the resistor R6 is connected to the first end of the feedback coil of the transformer T1, the second end of the feedback coil of the transformer T1 is grounded, the second end of the resistor R6 is connected to the first end of the varistor RP1, the second end of the varistor RP1 is connected to the control end of the switching tube Q2, the sliding end of the varistor RP1 is grounded through the capacitor C4, the first end of the switching tube Q2 is connected to the control end of the switching tube Q1, and the second end of the switching tube Q2 is grounded.
4. The modular cluster-control energy storage converter according to claim 1, further comprising an overcharge protection circuit, wherein the overcharge protection circuit comprises a resistor R10, a voltage stabilizing tube D4 and an optocoupler U2, a first end of the resistor R10 is connected with the positive electrode of the storage battery BT1, a second end of the resistor R10 is connected with the negative electrode of the voltage stabilizing tube D4, an anode of the voltage stabilizing tube D4 is connected with a first input end of the optocoupler U2, a second input end of the optocoupler U2 is grounded, a first output end of the optocoupler U2 is connected with a control end of the switching tube Q1, and a second output end of the optocoupler U2 is grounded.
5. The modular cluster-control energy storage converter according to claim 1, further comprising an over-discharge protection circuit, wherein the over-discharge protection circuit comprises a resistor R11, a voltage stabilizing tube D5, a resistor R12, a resistor R13, an operational amplifier U1, a resistor R14, a switching tube Q5, a resistor R15 and a switching tube Q6, a first end of the resistor R11 is connected with the positive electrode of the storage battery BT1, a second end of the resistor R11 is connected with the cathode of the voltage stabilizing tube D5, the anode of the voltage stabilizing tube D5 is grounded, the cathode of the voltage stabilizing tube D5 is connected with the inverting input end of the operational amplifier U1, a first end of the resistor R12 is connected with the positive electrode of the storage battery BT1, a second end of the resistor R12 is grounded through the resistor R13, an output end of the operational amplifier U1 is connected with the control end of the switching tube Q5 through the resistor R14, a first end of the switching tube Q5 is connected with the control end of the switching tube Q6 through the switching tube R15, and a second end of the switching tube Q6 is connected with the positive electrode of the switching tube Q6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322178210.7U CN220586017U (en) | 2023-08-14 | 2023-08-14 | Modularized cluster control energy storage converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322178210.7U CN220586017U (en) | 2023-08-14 | 2023-08-14 | Modularized cluster control energy storage converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220586017U true CN220586017U (en) | 2024-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322178210.7U Active CN220586017U (en) | 2023-08-14 | 2023-08-14 | Modularized cluster control energy storage converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220586017U (en) |
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2023
- 2023-08-14 CN CN202322178210.7U patent/CN220586017U/en active Active
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