CN218335382U - Switch circuit, BMS system and electronic equipment - Google Patents
Switch circuit, BMS system and electronic equipment Download PDFInfo
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- CN218335382U CN218335382U CN202222270610.6U CN202222270610U CN218335382U CN 218335382 U CN218335382 U CN 218335382U CN 202222270610 U CN202222270610 U CN 202222270610U CN 218335382 U CN218335382 U CN 218335382U
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Abstract
The utility model relates to a switching circuit, BMS system and electronic equipment, wherein the BMS system includes group battery, BMS control switch, BMS positive terminal and BMS negative terminal; the switching circuit includes: the device comprises a first switch unit, a driving level generation unit, a second switch unit, a power supply unit, a controller and a voltage detection unit; the voltage detection unit, the first switch unit and the driving level generation unit are connected in series to form a series link, and the series link is connected with the positive terminal of the BMS and the negative terminal of the battery pack; the voltage detection unit is also connected with the power supply unit, the controller and the BMS negative electrode terminal, the driving level generation unit is also connected with the BMS negative electrode terminal, the battery pack negative electrode and the second switch unit, and the second switch unit is connected with the BMS negative electrode terminal and the battery pack negative electrode; the power supply unit is connected with the positive terminal of the BMS and the negative terminal of the BMS, and the controller is connected with the power supply unit; the BMS control switch is connected with the controller. Implement the utility model discloses can realize reducing surge current through simple circuit design, and whole circuit is with low costs.
Description
Technical Field
The utility model relates to a BMS technical field, more specifically say, relate to a switch circuit, BMS system and electronic equipment.
Background
With the development of science and technology, the living standard of people is higher and higher, and the requirement on power utilization is more and more diversified, so that the development and the application of portable energy storage are faster and wider. The charging mode for BAT in the portable energy storage device is generally divided into ac mains supply, solar panel, dc TYPE-C charger, adapter and vehicle charging. When no external power supply section exists, BAT in the portable energy storage device is discharged and converted into different voltages to be output to the TYPE-C charger, the common USB, the wireless charger, the main control panel, the LED lamp, the PCS module and the like. At present, all portable energy storage devices use a battery pack BAT, but the BAT must be equipped with a special BMS for the efficiency and safety of the BAT. The BMS (BATTERY MANAGEMENT SYSTEM) is commonly called a BATTERY caregiver or a BATTERY manager, and is mainly used for intelligently managing and maintaining each BATTERY unit, preventing overcharge and overdischarge of the BATTERY, prolonging the service life of the BATTERY, and monitoring the state of the BATTERY. The BMS performs charge and discharge management on the BAT through a special charge and discharge switch loop.
Currently, the surge current is too large and uncontrollable at the moment of BAT power-on discharge. At present, because the BAT has very small internal resistance and the line impedance is added, uncontrollable surge current of dozens to hundreds of amperes can be generated at the beginning of BAT discharge. As the circuits of the TYPE-C charger, the common USB, the wireless charger, the main control board and the PCS module belong to capacitive loads, the transient impedance is very small. The surge current may damage devices inside the device and even the device may not work normally, and may also cause irreversible damage to the BAT, resulting in that the safety of the battery pack may not be well guaranteed. At present, the surge current is hard-resistant by electronic components, so that a large margin needs to be reserved in the design and selection of the components, the overall cost of equipment is increased, and the safety and reliability under surge impact cannot be well guaranteed. Thereby resulting in low reliability and low cost performance of the product.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned circuit of prior art with high costs, the technical defect that the reliability is low, provide a switch circuit, BMS system and electronic equipment.
The utility model provides a technical scheme that its technical problem adopted is: constructing a switching circuit, wherein the BMS system comprises a battery pack, a BMS control switch connected with the negative pole of the battery pack, a BMS negative pole terminal connected with the BMS control switch and a BMS positive pole terminal connected with the positive pole of the battery pack;
the switching circuit includes: the device comprises a first switch unit, a driving level generation unit, a second switch unit, a power supply unit, a controller and a voltage detection unit;
the voltage detection unit, the first switching unit and the driving level generation unit are connected in series to form a series link, a first end of the series link is connected to a positive electrode terminal of the BMS, and a second end of the series link is connected to a negative electrode of the battery pack;
the voltage detection unit is further connected with the power supply unit, the controller and the BMS negative terminal, the driving level generation unit is further connected with the BMS negative terminal, the battery pack negative terminal and a third terminal of the second switch unit, the first terminal of the second switch unit is connected with the BMS negative terminal, and the second terminal of the second switch unit is connected with the battery pack negative terminal;
the power supply unit is connected with the BMS positive terminal and the BMS negative terminal, and the controller is connected with the power supply unit and used for generating a control level;
wherein the BMS control switch is connected with the controller for receiving the control level.
Preferably, in the switching circuit of the present invention, the first switching unit includes a self-reset switch and a first resistor;
the first end of the first resistor is connected with the positive electrode terminal of the BMS, the second end of the first resistor is connected with the voltage detection unit, the first end of the self-reset switch is connected with the voltage detection unit, and the second end of the self-reset switch is connected with the driving level generation unit.
Preferably, in the switch circuit of the present invention, the voltage detection unit includes a first optical coupler, a second resistor, and a first capacitor;
the first end of first opto-coupler is connected the second end of first resistance, the second end of first opto-coupler is connected from reset switch's first end, the third end of first opto-coupler is connected the power supply unit, the fourth end of first opto-coupler is connected the controller the first end of second resistance with the first end of first electric capacity, the second end of second resistance with the second end of first electric capacity is connected respectively BMS negative pole end.
Preferably, in the switch circuit of the present invention, the driving level generating unit includes a second optocoupler, a third resistor, a fourth resistor, and a first diode;
the first end of the second optocoupler is connected with the second end of the self-resetting switch, the second end of the second optocoupler is connected with the negative electrode of the battery pack, the third end of the second optocoupler is connected with the first end of the third resistor, the fourth end of the second optocoupler is connected with the third end of the second switching unit and the first end of the fourth resistor, and the second end of the fourth resistor is connected with the negative electrode of the battery pack;
the second end of the third resistor is connected to the cathode of the first diode, and the anode of the first diode is connected to the negative terminal of the BMS.
Preferably, in the switch circuit of the present invention, the driving level generating unit further includes a voltage regulator and a second capacitor;
the cathode of the voltage-regulator tube and the first end of the second capacitor are connected with the third end of the second switch unit, and the anode of the voltage-regulator tube and the second end of the second capacitor are connected with the cathode of the battery pack.
Preferably, in the switching circuit of the present invention, the second switching unit includes a MOS transistor, a second diode and a fifth resistor;
the grid of MOS pipe is connected the fourth end of second opto-coupler, the source connection of MOS pipe the group battery negative pole, the drain electrode of MOS pipe is connected the first end of fifth resistance, the second end of fifth resistance is connected the negative pole of second diode, the positive pole of second diode is connected BMS negative pole end.
Preferably, in the switch circuit of the present invention, the first diode and the second diode are the same diode.
Preferably, in the switch circuit of the present invention, the self-reset switch is a manual push switch.
The utility model discloses still construct an electronic equipment, include: an operating circuit that is plug connected to the BMS system, wherein the operating circuit includes any of the above switching circuits.
The utility model discloses still construct a BMS system, include: the battery pack comprises a battery pack, a BMS control switch connected with the negative pole of the battery pack, a BMS negative pole end connected with the BMS control switch and a BMS positive pole end connected with the positive pole of the battery pack; and a switching circuit as claimed in any one of the above.
Implement the utility model discloses a switch circuit, BMS system and electronic equipment has following beneficial effect: the surge current can be reduced by simple circuit design, and the whole circuit is low in cost.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a logic block diagram of an embodiment of a switching circuit of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the switch circuit of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, in the first embodiment of a switching circuit 100 of the present invention, the BMS system 200 includes a battery pack 210, a BMS control switch 220 connected to a negative electrode of the battery pack, a BMS negative terminal connected to the BMS control switch 220, and a BMS positive terminal connected to a positive electrode of the battery pack; the switching circuit 100 includes: a first switching unit 110, a driving level generating unit 120, a second switching unit 130, a power supplying unit 150, a controller 160, and a voltage detecting unit 140; the voltage detection unit 140, the first switching unit 110, and the driving level generation unit 120 are connected in series to form a series link, a first end of the series link is connected to the BMS positive terminal, and a second end of the series link is connected to the battery pack negative terminal; the voltage detection unit 140 is further connected to the power supply unit 150, the controller 160 and the BMS negative terminal, the driving level generation unit 120 is further connected to the BMS negative terminal, the battery negative terminal and the third terminal of the second switching unit 130, the first terminal of the second switching unit 130 is connected to the BMS negative terminal, and the second terminal of the second switching unit 130 is connected to the battery negative terminal; the power supply unit 150 is connected to the BMS positive terminal and the BMS negative terminal, and the controller 160 is connected to the power supply unit 150 and generates a control level; the BMS controlling switch 220 is connected to the controller 160 for receiving the control level.
Specifically, the BMS positive terminal and the BMS negative terminal of the BMS system 200 are used to connect the operating circuit. By default, BMS control switch 220 in BMS system 200 is in an off state, where the circuit between the BMS positive terminal and the BMS negative terminal is turned off and the output of BMS system 200 is in the off state. When the positive terminal of the BMS and the negative terminal of the BMS are connected to the operating circuit, the output of the BMS system 200 may be maintained in an off state and the operating circuit may not be powered up. At this time, the first switch unit 110 is triggered to be turned on. When the first switching unit 110 is turned on, a series link formed by connecting the voltage detecting unit 140, the first switching unit 110, and the driving level generating unit 120 in series is turned on, and at this time, the BMS positive terminal forms a conduction path with the battery negative terminal through the series link. Through the conducting path, the driving level generating unit 120 starts to operate to generate a driving level, and the second switching unit 130 receives the driving level to drive conduction. When the second switching unit 130 is turned on, the discharge path between the negative terminal of the battery pack and the negative terminal of the BMS is turned on, and the positive terminal of the BMS and the negative terminal of the BMS system 200 may form a loop with the operating circuit, i.e., the BMS system 200 outputs the on state at this time. When the output of the BMS system 200 is turned on, the power supply unit 150 in the switch circuit 100 is powered on to output the control voltage level, the controller 160 is powered on to output the control voltage level, the conduction of the BMS control switch 220 is controlled through the control voltage level, the conduction of the BMS control switch 220 at the moment corresponds to the conduction of the output of the BMS system 200, and the normal output of the BMS system 200 maintains the normal work of the working circuit and the power supply unit 150. When the second switching unit 130 is turned on, the current between the BMS positive terminal and the BMS negative terminal of the BMS system 200 powers on the load operating circuit, the capacitive load in the load operating circuit is charged at this time, and the current between the BMS positive terminal and the BMS negative terminal is limited by the second switching unit 130, so that it does not generate a large surge current. When the BMS control switch 220 is turned on to power on the load working circuit, the load working circuit does not generate a large current any more, thereby realizing surge protection of the load working circuit, and meanwhile, when the control switch of the BMS system 200 is turned on, the first switching unit 110 should exit from the on state at this time, that is, the driving level generating unit 120 does not generate the driving level any more, and the second switching unit 130 should be in the off state at this time.
When it is necessary to turn off the BMS system 200, the first switching unit 110 may be triggered to be turned on again. Since the power supply unit 150 connected to the voltage detection unit 140 has a voltage output at this time, when the first switching unit 110 is turned on, the voltage detection unit 140 operates to generate a detection voltage according to the voltage output of the power supply unit 150, and the controller 160 receives the detection voltage and turns off the control level, so that the BMS control switch 220 in the BMS system 200 is turned off and the output of the entire BMS system 200 is turned off. Here, the first switching unit 110 exits the on state at this time, so that the entire BMS system 200 is in the off state. The on/off of the BMS system 200 may be realized through the above-described procedure.
As shown in fig. 2, the first switching unit 110 includes a self-reset switch and a first resistor; a first terminal of the first resistor is connected to the BMS positive terminal (corresponding to P + in fig. 2), a second terminal of the first resistor is connected to the voltage detecting unit 140, a first terminal of the self reset switch is connected to the voltage detecting unit 140, a second terminal of the self reset switch is connected to the driving level generating unit 120, and the driving level generating unit 120 is connected to the battery negative terminal. Specifically, the first switching unit 110 is composed of a self-reset switch including a switch K1 and a first resistor including a resistor R6. The switch K1 may be a manual push button switch that turns on when pressure is present and returns to off when pressure is removed. The resistor R6 and the switch K1 are connected in series to limit the current of the series link. The voltage detection unit 140 and the driving level generation unit 120 are connected in a series link, and can start operation when the series link is turned on. The operating current of the voltage detection unit 140 and the driving level generation unit 120 may be limited by the resistor R6.
Optionally, the voltage detection unit 140 includes a first optocoupler, a second resistor, and a first capacitor; the first end of the first optical coupler is connected with the second end of the first resistor, the second end of the first optical coupler is connected with the first end of the self-reset switch, the third end of the first optical coupler is connected with the power supply unit 150, the fourth end of the first optical coupler is connected with the controller 160, the first end of the second resistor and the first end of the first capacitor, and the second end of the second resistor and the second end of the first capacitor are respectively connected with the negative pole end of the BMS. Specifically, in the voltage detection unit 140, the first optocoupler includes an optocoupler U1, the second resistor includes a resistor R4, and the first capacitor includes a capacitor C2. The transmitter of opto-coupler U1 establishes ties in resistance R6 and switch K1's series link to work when switch K1 switches on and give out light, opto-coupler U1's receiver begins work, when there is supply voltage input at the first end of opto-coupler U1's receiver, because resistance R4's partial pressure effect, its second end at opto-coupler U1's receiver generates detection voltage, and controller 160 can receive this detection voltage and move. In an embodiment, the power supply voltage provided by the power supply unit 150 may be input to the first end of the receiver of the optical coupler U1 through the resistor R5. The capacitor C2 is used for filtering the detection voltage to filter an interference signal of the detection voltage KEY _ STATUS, thereby preventing a malfunction. In one embodiment, the magnitude of the detection voltage may be understood to be approximately the voltage output of the power supply unit 150. In addition, a relay, a MOSFET, a silicon controlled rectifier and other switching devices can be adopted to replace the first optocoupler.
Optionally, the driving level generating unit 120 includes a second optocoupler, a third resistor, a fourth resistor, and a first diode; a first end of the second optocoupler is connected with a second end of the self-reset switch, a second end of the second optocoupler is connected with a negative electrode of the battery pack, a third end of the second optocoupler is connected with a first end of a third resistor, a fourth end of the second optocoupler is connected with a third end of the second switch unit 130 and a first end of a fourth resistor, and a second end of the fourth resistor is connected with a negative electrode of the battery pack; the second end of the third resistor is connected with the cathode of the first diode, and the anode of the first diode is connected with the negative pole terminal of the BMS. Specifically, in the driving level generating unit 120, the second optocoupler includes an optocoupler U2, the third resistor includes a resistor R2, the fourth resistor includes a resistor R7, and the first diode includes a diode D1. The transmitter of opto-coupler U2 establishes ties in resistance R6 and switch K1's series link, and it is luminous to work when switch K1 switches on, opto-coupler U2's receiver begins work, the first end of opto-coupler U2's receiver is connected to BMS negative pole end through resistance R2 and diode D1, the second end of opto-coupler U2's receiver is connected to the group battery negative pole through resistance R7, be equivalent to BMS positive pole end and BMS negative pole end and formed the conduction return circuit through opto-coupler U2's receiver this moment, resistance R2 and resistance R7 form the series relation through opto-coupler U2, can generate driving voltage at resistance R7's first end, this driving voltage can drive second switch unit 130 and switch on. In addition, a relay, a MOSFET, a silicon controlled rectifier and other switching devices can be adopted to replace the second optocoupler.
Optionally, the driving level generating unit 120 further includes a voltage regulator and a second capacitor; the cathode of the voltage regulator tube and the first end of the second capacitor are connected with the third end of the second switch unit 130, and the anode of the voltage regulator tube and the second end of the second capacitor are connected with the cathode of the battery pack. Specifically, in the driving level generating unit 120, the voltage regulator includes a voltage regulator ZD1, and the second capacitor includes a capacitor C1. The voltage regulator tube ZD1 is used for voltage clamping to stabilize the driving level, and the capacitor C1 is a filter capacitor to filter out interference signals of the driving level.
Optionally, the second switching unit 130 includes a MOS transistor, a second diode, and a fifth resistor; the grid electrode of the MOS tube is connected with the fourth end of the second optocoupler, the source electrode of the MOS tube is connected with the negative electrode of the battery pack, the drain electrode of the MOS tube is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the cathode of the second diode, and the anode of the second diode is connected with the negative electrode end of the BMS. Specifically, in the second switching unit 130, the MOS transistor includes a MOS transistor Q3, the second diode includes a diode D1, and the fifth resistor includes a resistor R3. Here, the first diode and the second diode may be the same diode, i.e., both diodes D1. In an embodiment, the first diode and the second diode may be different diodes. The gate of the MOS transistor Q3 is used for receiving the divided voltage of the resistor R2 and the resistor R7 and conducting. Resistor R3 is used to limit the current flowing through MOS transistor Q3. Through the current limiting function of the resistor R3, the starting current of the BMS system can be reduced to dozens of milliamperes to hundreds of milliamperes, so that the surge cannot be generated.
Alternatively, the BMS control switch 220 includes a charging switch of the battery pack 210 and a discharging switch of the battery pack 210, and the controller 160 is connected to the discharging switch of the battery pack 210. Specifically, in BMS control switch 220, the charge switch includes a charge MOSFET switch Q1 for the battery BAT, and the discharge switch includes a discharge MOSFET switch Q2 for the battery BAT, which controls switch Q2 when BMS system 200 is turned on and off. It is understood that the control process may be connected to transmit the control level using a data transmission interface or a communication interface existing in the BMS system. The communication interface CAN be CAN communication protocol, RS-485 protocol, etc., and CAN be controlled by the existing control process of BMS.
The electronic device of the present invention includes: an operating circuit that is plug connected to the BMS system 200, wherein the operating circuit includes the switching circuit 100 of any of the above. That is, the operating circuit of the electronic device is connected to the BMS system 200 by insertion and removal, and the power is supplied to the operating circuit through the BMS system 200, and the switching circuit 100 is provided in the operating circuit to turn on and off the BMS system 200. It can be understood that the switching circuit 100 is disposed on an operating circuit of the electronic device, and when the BMS system 200 is connected to the electronic device, the electronic device may be triggered to perform the on/off operation of the BMS system 200. The connection relationship among the switching circuit 100, the BMS positive electrode, the BMS negative electrode, the BMS control switch 220, and the battery pack negative electrode at this time may be realized by a connector. It is understood that the controller 160 in the switch circuit 100 may be implemented by an existing control chip in the working circuit, such as an MCU or a CPU, and the power supply unit 150 in the switch circuit 100 may also be implemented by an existing power conversion circuit in the working circuit.
A BMS system 200 of the present invention comprises: a battery pack 210, a BMS control switch 220 connected to a negative electrode of the battery pack, a BMS negative terminal connected to the BMS control switch 220, and a BMS positive terminal connected to a positive electrode of the battery pack; and a switching circuit 100 as in any above. That is, the switching circuit 100 is disposed in the BMS system 200, and when the BMS system 200 connects an electronic device, the switching on/off of the electronic device can be triggered by triggering the BMS system 200, wherein the controller 160 in the switching circuit 100 can be implemented by a control chip existing in an operating circuit in the electronic device, such as an MCU or a CPU, and the power supply unit 150 in the switching circuit 100 can also be implemented by a power conversion circuit existing in the operating circuit in the electronic device. When the controller 160 and the power supply unit 150 are both operating circuits of the electronic device, corresponding connectors may be disposed in the switch circuit 100 to connect the controller 160 and the power supply unit 150.
It is to be understood that the foregoing examples merely represent preferred embodiments of the present invention, and that the description thereof is more specific and detailed, but not intended to limit the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. The switching circuit is applied to a BMS system, wherein the BMS system comprises a battery pack, a BMS control switch connected with the negative pole of the battery pack, a BMS negative pole terminal connected with the BMS control switch and a BMS positive pole terminal connected with the positive pole of the battery pack;
the switching circuit includes: the device comprises a first switch unit, a driving level generation unit, a second switch unit, a power supply unit, a controller and a voltage detection unit;
the voltage detection unit, the first switching unit and the driving level generation unit are connected in series to form a series link, a first end of the series link is connected to a positive electrode terminal of the BMS, and a second end of the series link is connected to a negative electrode of the battery pack;
the voltage detection unit is further connected with the power supply unit, the controller and the BMS negative terminal, the driving level generation unit is further connected with the BMS negative terminal, the battery pack negative terminal and a third terminal of the second switch unit, the first terminal of the second switch unit is connected with the BMS negative terminal, and the second terminal of the second switch unit is connected with the battery pack negative terminal;
the power supply unit is connected with the BMS positive terminal and the BMS negative terminal, and the controller is connected with the power supply unit and used for generating a control level;
wherein the BMS control switch is connected with the controller for receiving the control level.
2. The switching circuit according to claim 1, wherein the first switching unit includes a self-reset switch and a first resistor;
the first end of the first resistor is connected with the positive electrode terminal of the BMS, the second end of the first resistor is connected with the voltage detection unit, the first end of the self-reset switch is connected with the voltage detection unit, and the second end of the self-reset switch is connected with the driving level generation unit.
3. The switch circuit according to claim 2, wherein the voltage detection unit comprises a first optocoupler, a second resistor, and a first capacitor;
the first end of first opto-coupler is connected the second end of first resistance, the second end of first opto-coupler is connected from reset switch's first end, the third end of first opto-coupler is connected the power supply unit, the fourth end of first opto-coupler is connected the controller the first end of second resistance with the first end of first electric capacity, the second end of second resistance with the second end of first electric capacity is connected respectively BMS negative pole end.
4. The switch circuit according to claim 2, wherein the drive level generating unit includes a second optocoupler, a third resistor, a fourth resistor, and a first diode;
a first end of the second optocoupler is connected with a second end of the self-reset switch, a second end of the second optocoupler is connected with the negative electrode of the battery pack, a third end of the second optocoupler is connected with a first end of the third resistor, a fourth end of the second optocoupler is connected with a third end of the second switching unit and a first end of the fourth resistor, and a second end of the fourth resistor is connected with the negative electrode of the battery pack;
the second end of the third resistor is connected to the cathode of the first diode, and the anode of the first diode is connected to the negative terminal of the BMS.
5. The switch circuit according to claim 4, wherein the driving level generating unit further comprises a voltage regulator and a second capacitor;
the cathode of the voltage-regulator tube and the first end of the second capacitor are connected with the third end of the second switch unit, and the anode of the voltage-regulator tube and the second end of the second capacitor are connected with the cathode of the battery pack.
6. The switch circuit according to claim 4, wherein the second switch unit comprises a MOS transistor, a second diode and a fifth resistor;
the grid of MOS pipe is connected the fourth end of second opto-coupler, the source connection of MOS pipe the group battery negative pole, the drain electrode of MOS pipe is connected the first end of fifth resistance, the second end of fifth resistance is connected the negative pole of second diode, the positive pole of second diode is connected BMS negative pole end.
7. The switch circuit of claim 6, wherein the first diode and the second diode are the same diode.
8. The switch circuit of claim 2, wherein the self-resetting switch is a manual push-button switch.
9. An electronic device, comprising: an operating circuit that is plug-connected to a BMS system, wherein the operating circuit comprises the switching circuit according to any one of claims 1 to 8.
10. A BMS system, comprising: the battery pack comprises a battery pack, a BMS control switch connected with the negative pole of the battery pack, a BMS negative pole end connected with the BMS control switch and a BMS positive pole end connected with the positive pole of the battery pack; and a switching circuit as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222270610.6U CN218335382U (en) | 2022-08-26 | 2022-08-26 | Switch circuit, BMS system and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222270610.6U CN218335382U (en) | 2022-08-26 | 2022-08-26 | Switch circuit, BMS system and electronic equipment |
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| Publication Number | Publication Date |
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| CN218335382U true CN218335382U (en) | 2023-01-17 |
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| CN202222270610.6U Active CN218335382U (en) | 2022-08-26 | 2022-08-26 | Switch circuit, BMS system and electronic equipment |
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- 2022-08-26 CN CN202222270610.6U patent/CN218335382U/en active Active
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