CN218514090U - Battery reverse connection protection circuit, battery pack and electronic equipment - Google Patents
Battery reverse connection protection circuit, battery pack and electronic equipment Download PDFInfo
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- CN218514090U CN218514090U CN202222008734.7U CN202222008734U CN218514090U CN 218514090 U CN218514090 U CN 218514090U CN 202222008734 U CN202222008734 U CN 202222008734U CN 218514090 U CN218514090 U CN 218514090U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application belongs to the technical field of electronic circuits, and provides a battery reverse connection protection circuit, a battery pack and electronic equipment, wherein a clamping follow current module is connected with a battery access port and provides a current discharge channel when a battery is reversely connected through the clamping follow current module; the protection response module detects surge current generated when the battery is reversely connected and generates a protection response signal, the control module generates a protection locking signal according to the protection response signal, and the main loop switch module is used for controlling charging and discharging of the battery module and disconnecting according to the protection response signal and/or the protection locking signal so as to disconnect a charging and discharging loop of the battery module, thereby avoiding the problem that a single plate is damaged when the battery is reversely connected.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a battery reverse connection protection circuit, a battery pack and an electronic device.
Background
With the wide application of lithium battery products in the market, more and more products require that a plurality of batteries are used in parallel. As the number of used batteries increases, the wiring is more complicated when the batteries are used; the possibility of reverse connection occurring when connected in parallel is higher. If the power supply of the battery pack is reversely connected, the following problems can occur: when the two lithium batteries are reversely connected, the two lithium batteries are reversely irrigated, and the lithium batteries have the characteristics of large energy and low internal resistance, so that the current is quite large when the two lithium batteries are reversely connected, and a single plate can be damaged; meanwhile, the voltage of opposite polarities of the battery is added, double voltage is applied to the device of the protective plate, and the designed withstand voltage is exceeded, so that the single plate fails.
SUMMERY OF THE UTILITY MODEL
In order to achieve the above object, embodiments of the present application provide a battery reverse connection protection circuit, a battery pack, and an electronic device, which aim to solve the problem that a single board is damaged due to reverse connection of a battery.
The first aspect of the embodiment of the application provides a battery joins conversely protection circuit, is connected with the battery module, battery joins conversely protection circuit includes:
a battery access port;
the clamping follow current module is connected with the battery access port and is used for providing a current discharge channel when the battery is reversely connected;
the protection response module is connected with the battery access port and used for detecting surge current generated when the battery is reversely connected and generating a protection response signal;
the control module is connected with the protection response module and used for receiving the protection response signal and generating a protection locking signal according to the protection response signal;
and the main loop switch module is connected with the control module, the protection response module, the battery access port and the battery module, is used for controlling the charging and discharging of the battery module, and is disconnected according to the protection response signal and/or the protection locking signal so as to disconnect the charging and discharging loop of the battery module.
In one embodiment, the clamped freewheel module includes: a power diode;
and the cathode of the power diode is connected with the positive terminal of the battery access port, and the anode of the power diode is connected with the negative terminal of the battery access port.
In one embodiment, the protection response module comprises:
the current sampling unit is connected with the battery access port and is used for sampling the current of the battery access port to generate a current sampling signal;
the comparison unit is connected with the current sampling signal and used for comparing the current sampling signal with a threshold protection voltage and generating a response signal when the current sampling signal is greater than the threshold protection voltage;
and the response unit is connected with the comparison unit and used for receiving the response signal and controlling the main loop switch module to be disconnected according to the response signal.
In one embodiment, the main loop switch module includes:
the driving unit is connected with the control module and used for receiving the protection locking signal and generating a locking driving signal according to the protection locking signal;
and the discharge switch unit is connected with the driving unit and the battery module, and is used for receiving the locking driving signal and disconnecting according to the locking driving signal.
In one embodiment, the main loop switch module further comprises:
the charging switch unit is connected with the driving unit and the discharging switch unit, and is used for receiving the charging driving signal generated by the driving unit and conducting or switching off according to the charging driving signal;
the control module is further configured to generate a charging control signal to control the driving unit to generate the charging driving signal.
In one embodiment, the discharge switch unit and the charge switch unit are N-type MOS transistors;
the discharging switch unit is connected with the charging switch unit in series, and the drains of the discharging switch unit and the charging switch unit are connected in common.
In one embodiment, the response unit includes: the response switch tube, the first resistor and the first diode;
the anode of the first diode is connected with the main loop switch module, the cathode of the first diode is connected with the first end of the response switch tube, the control end of the response switch tube and the first end of the first resistor are connected to the comparison unit in common, and the second end of the first resistor and the second end of the response switch tube are grounded.
In one embodiment, the current sampling unit is a sampling resistor.
The second aspect of the embodiments of the present application further provides a battery pack, including: the battery module, and the battery joins conversely protection circuit as in any one above-mentioned.
The third aspect of the embodiments of the present application further provides an electronic device, including the reverse battery protection circuit as described in any one of the above.
The embodiment of the application provides a battery reverse connection protection circuit, a battery pack and electronic equipment, wherein a clamping follow current module is connected with a battery access port and is used for providing a current discharge channel when a battery is reversely connected; the protection response module detects surge current generated when the battery is reversely connected and generates a protection response signal, the control module generates a protection locking signal according to the protection response signal, and the main loop switch module is used for controlling charging and discharging of the battery module and is disconnected according to the protection response signal and/or the protection locking signal so as to disconnect a charging and discharging loop of the battery module, thereby avoiding the problem that the single board is damaged when the battery is reversely connected.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a reverse battery protection circuit according to an embodiment of the present disclosure;
fig. 2 is another schematic structural diagram of a reverse battery protection circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the embodiments of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the drawings described above, are intended to cover non-exclusive inclusions. For example, a process, method, or system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Furthermore, the terms "first", "second", and "third", etc. are used to distinguish different objects, and are not used to describe a particular order.
The embodiment of the present application provides a reverse battery protection circuit, as shown in fig. 1, the reverse battery protection circuit in this embodiment is connected to a battery module 100, and the reverse battery protection circuit includes: the device comprises a battery access port 200, a clamping follow current module 300, a protection response module 400, a control module 500 and a main circuit switch module 600.
The clamping follow current module 300 is connected with the battery access port 200, and the clamping follow current module 300 is used for providing a current drainage channel when the battery is reversely connected; the protection response module 400 is connected with the battery access port 200, and the protection response module 400 is used for detecting surge current generated when the battery is reversely connected and generating a protection response signal; the control module 500 is connected to the protection response module 400, and is configured to receive the protection response signal and generate a protection locking signal according to the protection response signal; the main circuit switch module 600 is connected to the control module 500, the protection response module 400, the battery access port 200, and the battery module 100, and the main circuit switch module 600 is configured to control charging and discharging of the battery module 100 and disconnect the battery module 100 according to the protection response signal and/or the protection locking signal.
In this embodiment, by connecting the clamping freewheeling module 300 in parallel with the battery access port 200, when a reverse connection condition occurs in a battery accessed by the battery access port 200, the clamping freewheeling module 300 can provide a fast discharge current path to bypass and discharge a surge caused by the reverse connection, and clamp the voltage at a preset voltage to protect a single-board device.
Further, the protection response module 400 is connected to the battery access port 200, and is configured to collect a current of the battery access port 200, and generate a corresponding protection response signal when the battery access port 200 is in a reverse connection state, so as to control the main loop switch module 600 to be disconnected, thereby quickly turning off the power loop and protecting the single board device.
In a specific application embodiment, the control module 500 generates a protection locking signal according to the protection response signal, and the protection locking signal can lock the main loop switch module 600 to be turned off, so as to prevent the occurrence of surge again.
Further, the control module 500 records the reverse connection event according to the protection response signal, or generates a battery reverse connection signal according to the protection response signal and sends the battery reverse connection signal to the upper computer, and the upper computer notifies the user of the occurrence of the reverse connection condition of the battery according to the battery reverse connection signal.
In one embodiment, referring to fig. 2, the clamped freewheel module 300 includes: a power diode D0.
The cathode of the power diode D0 is connected to the positive terminal of the battery access port 200, and the anode of the power diode D0 is connected to the negative terminal of the battery access port 200.
In this embodiment, the power diode D0 is disposed between the positive terminal and the negative terminal of the battery access port 200, when multiple sets of batteries are connected in parallel, if the battery accessed by the battery access port 200 is reversely connected, the positive terminal is accessed to the negative terminal of the external battery, the negative terminal is accessed to the positive terminal of the external battery, and the external battery discharges surge current through the power diode D0, so that the single-board device can be protected, and the single-board device is prevented from being out of service due to negative voltage.
In one embodiment, referring to fig. 2, the protection response module 400 includes: current sampling unit 410, comparison unit 420, and response unit 430.
The current sampling unit 410 is connected with the battery access port 200, and the current sampling unit 410 is used for sampling the current of the battery access port to generate a current sampling signal; the comparing unit 420 is connected to the current sampling signal, and the comparing unit 420 is configured to compare the current sampling signal with a threshold protection voltage, and generate a response signal when the current sampling signal is greater than the threshold protection voltage; the response unit 430 is connected to the comparison unit 420, and the response unit 430 is configured to receive the response signal and control the main circuit switch module 600 to be turned off according to the response signal.
In this embodiment, the current sampling unit 410 is connected in series with the battery access port 200, the current sampling unit 410 samples the current of the battery access port to generate a current sampling signal, and sends the current sampling signal to the comparison unit 420, the comparison unit 420 compares the current sampling signal with the threshold protection voltage, and generates a response signal when the current sampling signal is greater than the threshold protection voltage, and at this time, the response unit 430 quickly responds according to the response signal to disconnect the main loop switch module 600, thereby shutting off the power loop and avoiding the generation of a continuous surge current when the external battery is reversely connected.
In one embodiment, referring to fig. 2, the response unit 430 includes: the circuit comprises a response switch tube Q3, a first resistor R1 and a first diode D1.
The anode of the first diode D1 is connected to the main loop switch module 600, the cathode of the first diode D1 is connected to the first end of the response switch tube Q3, the control end of the response switch tube Q3 and the first end of the first resistor R1 are commonly connected to the comparing unit 420, and the second end of the first resistor R1 and the second end of the response switch tube Q3 are grounded.
In one embodiment, referring to fig. 2, the comparing unit 420 includes: comparator U2, second resistance R2.
Specifically, the reference voltage terminal of the comparator U2 is connected to the reference power supply, the input terminal of the comparator U2 is connected to the current sampling unit 410, the output terminal of the comparator U2 is connected to the first terminal of the second resistor R2, and the second terminal of the second resistor R2 is connected to the response unit 430.
In this embodiment, the comparator U2 and the second resistor R2 form a comparison circuit, which is configured to compare the current sampling signal generated by the current sampling unit 410 with a threshold protection voltage, and output a response signal according to a comparison result, specifically, the level of the response signal may be used to determine whether the battery access port 200 has a reverse battery protection voltage, for example, if the response signal is low, it indicates that the voltage of the current sampling signal is lower than the threshold protection voltage, and the battery access port 200 has no battery reverse connection event, and if the response signal is high, it indicates that the voltage of the current sampling signal is greater than the threshold protection voltage, and the battery access port 200 has a battery reverse connection event.
In one embodiment, the current sampling unit 410 may be a sampling resistor.
In one embodiment, referring to fig. 2, the current sampling unit 410 includes: a fourth resistor R4 and a sampling resistor Rs.
Specifically, a first end of the sampling resistor Rs is connected to the battery module 100, a second end of the sampling resistor Rs and a first end of the fourth resistor R4 are connected to a negative terminal of the battery access port 200, and a second end of the fourth resistor R4 is connected to an input terminal of the comparator U2.
In the present embodiment, the sampling resistor Rs is connected in series with the battery access port 200, and generates a current sampling signal to the comparison unit 420 by converting a current flowing through the sampling resistor Rs into a corresponding voltage signal through the fourth resistor R4.
In one embodiment, the control module 500 may be a signal conversion circuit, or may be a main control circuit composed of a main control chip and peripheral devices thereof.
Referring to fig. 2, a response signal input pin DET of the control module 500 is connected to an output terminal of the comparing unit 420, the response signal input pin DET is used for receiving a response signal, and the control module 500 generates a protection locking signal according to the response signal and sends the protection locking signal to the main circuit switch module 600, so as to control the main circuit switch module 600 to be turned off.
Referring to fig. 2, the first sampling pin SN of the control module 500 is connected to the first end of the sampling resistor Rs through a third resistor R3, and the second sampling pin SP of the control module 500 is connected to the second end of the sampling resistor Rs through a fourth resistor R4.
The first sampling pin SN and the second sampling pin SP of the control module 500 are respectively connected to two ends of the sampling resistor Rs, so that current flowing through the sampling resistor Rs can be detected, and sampling current signals obtained through sampling are uploaded to an upper computer.
In a specific application embodiment, the upper computer can be connected with a display screen, and the display screen displays the sampling current value according to the received sampling current signal.
Further, the first battery pin C1 of the control module 500 is connected to the positive terminal of the battery module 100, the second battery pin C2 of the control module 500 is connected to the negative terminal of the battery module 100, and the control module 500 can detect the electric quantity of the battery module 100 by detecting the voltages at the two terminals of the battery module 100.
Further, the battery module 100 may be formed by connecting a plurality of battery cells in series (battery cells B1, \8230;, battery cell Bn), where two ends of each battery cell are respectively connected to the battery pins of the control module 500, and the control module 500 may determine the electric quantity of each battery cell by detecting the voltage at two ends of each battery cell.
In one embodiment, referring to fig. 2, the main loop switch module 600 includes: a driving unit 610, and a discharge switching unit 630.
Specifically, the driving unit 610 is connected to the control module 500, the discharge switch unit 630 is connected to the driving unit 610 and the battery module 100, and the driving unit 610 is configured to receive the protection locking signal and generate a locking driving signal according to the protection locking signal; the discharging switch unit 630 is configured to receive the locking driving signal and turn off according to the locking driving signal.
In this embodiment, the discharging driving signal terminal DSG of the driving unit 610 is connected to the control terminal of the discharging switch unit 630, and the driving unit 610 outputs a corresponding discharging driving signal according to the discharging control signal generated by the control module 500 to control the discharging switch unit 630 to be turned on and off, so as to control the discharging of the battery module 100.
In one embodiment, referring to fig. 2, the main circuit switch module 600 further comprises: the charge switch unit 620.
The charging switch unit 620 is connected to the driving unit 610 and the discharging switch unit 630, and the charging switch unit 620 is configured to receive a charging driving signal generated by the driving unit 610 and turn on or off according to the charging driving signal; the control module 500 is further configured to generate a charging control signal to control the driving unit 610 to generate the charging driving signal.
In this embodiment, the charging driving signal terminal CHG of the driving unit 610 is connected to the control terminal of the charging switch unit 620, and the driving unit 610 outputs a corresponding charging driving signal to control the on/off of the charging switch unit 620 according to the charging control signal generated by the control module 500, so as to control the charging of the battery module 100.
In one embodiment, the discharge switch unit 630 and the charge switch unit 620 are N-type MOS transistors. The discharge switch unit 630 is connected in series with the charge switch unit 620, and the drains of the discharge switch unit 630 and the charge switch unit 620 are connected in common.
In one embodiment, referring to fig. 2, the charge switch unit 620 includes: the circuit comprises a first switch tube Q1, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7.
The first end of the first switching tube Q1 and the first end of the sixth resistor R6 are commonly connected to the positive terminal of the battery module 100, the control end of the first switching tube Q1 is connected to the first end of the fifth resistor R5, the second end of the sixth resistor R6 and the first end of the seventh resistor R7 are commonly connected, and the second end of the seventh resistor R7 is connected to the charging driving signal terminal CHG of the driving unit 610.
In one embodiment, referring to fig. 2, the discharge switch unit 630 includes: a second switch tube Q2, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10.
The first end of the second switch tube Q2 is connected to the second end of the first switch tube Q1, the control end of the second switch tube Q2 is connected to the first end of the eighth resistor R8, the second end of the second switch tube Q2 and the first end of the ninth resistor R9 are connected to the positive electrode PACK + of the battery access port 200, the second end of the ninth resistor R9, the second end of the tenth resistor R10 and the second end of the eighth resistor R8 are connected to the response unit 430, and the second end of the tenth resistor R10 is connected to the discharge driving signal terminal DSG of the driving unit 610.
In one embodiment, the second switching tube Q2 and the first switching tube Q1 are N-type MOS tubes.
In one embodiment, as shown in fig. 2, the charge enable signal terminal CHG-EN of the driving unit 610 is connected to the charge control signal terminal CHG of the control module 500, and the discharge enable signal terminal DSG-EN of the driving unit 610 is connected to the discharge control signal terminal DSG of the control module 500.
In this embodiment, when the charging control signal CHG output by the control module 500 is at a high level, the driving unit 610 raises the driving voltage, and the driving unit 610 provides the high-voltage charging driving signal to the control terminal of the first switch Q1 to drive the first switch Q1 to be turned on. When the charging control signal CHG of the control module 500 is at a low level, the driving unit 610 controls the pin CHG to be connected to the power pin of the driving unit 610 (the power pin is connected to the first end of the first switch Q1), so that the voltage between the first end (source) and the control end (gate) of the first switch Q1 is pulled to zero volts, and the first switch Q1 is turned off.
Similarly, when the discharge control signal DSG output by the control module 500 is at a high level, the driving unit 610 raises the driving voltage, and the driving unit 610 provides the high-voltage discharge driving signal to the control end of the second switch Q2 to drive the second switch Q2 to be turned on. When the discharge control signal DSG of the control module 500 is at a low level, the driving unit 610 controls the pin CHG of the discharge driving pin to be connected to the power pin (the power pin is connected to the first end of the first switch Q1) of the driving unit 610, so that the voltage between the first end (source) and the control end (gate) of the second switch Q2 is pulled to zero volts, and the second switch Q2 is turned off.
An embodiment of the present application further provides a battery pack, including: the battery module, and the battery joins conversely protection circuit as in any one above-mentioned.
In this embodiment, each battery pack is provided with the battery reverse connection protection circuit according to any one of the embodiments, and when a plurality of battery packs are connected in parallel, if the parallel connection between the battery packs is in reverse connection, the power loop in each battery pack can be quickly disconnected through the battery reverse connection protection circuit, so that a single board is prevented from being damaged due to the reverse connection of the batteries.
An embodiment of the present application further provides an electronic device, including the reverse battery protection circuit as described in any one of the above.
The embodiment of the application provides a battery reverse connection protection circuit, a battery pack and electronic equipment, wherein a clamping follow current module is connected with a battery access port and is used for providing a current discharge channel when a battery is reversely connected; the protection response module detects surge current generated when the battery is reversely connected and generates a protection response signal, the control module generates a protection locking signal according to the protection response signal, and the main loop switch module is used for controlling charging and discharging of the battery module and is disconnected according to the protection response signal and/or the protection locking signal so as to disconnect a charging and discharging loop of the battery module, thereby avoiding the problem that the single board is damaged when the battery is reversely connected.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. The utility model provides a battery joins conversely protection circuit, is connected with the battery module, its characterized in that, battery joins conversely protection circuit includes:
a battery access port;
the clamping follow current module is connected with the battery access port and is used for providing a current discharge channel when the battery is reversely connected;
the protection response module is connected with the battery access port and used for detecting surge current generated when the battery is reversely connected and generating a protection response signal;
the control module is connected with the protection response module and used for receiving the protection response signal and generating a protection locking signal according to the protection response signal;
and the main loop switch module is connected with the control module, the protection response module, the battery access port and the battery module, is used for controlling the charging and discharging of the battery module, and is disconnected according to the protection response signal and/or the protection locking signal so as to disconnect the charging and discharging loop of the battery module.
2. The reverse battery protection circuit of claim 1, wherein the clamped freewheeling module comprises: a power diode;
and the cathode of the power diode is connected with the positive terminal of the battery access port, and the anode of the power diode is connected with the negative terminal of the battery access port.
3. The reverse battery protection circuit of claim 1, wherein the protection response module comprises:
the current sampling unit is connected with the battery access port and is used for sampling the current of the battery access port to generate a current sampling signal;
the comparison unit is connected with the current sampling signal and used for comparing the current sampling signal with a threshold protection voltage and generating a response signal when the current sampling signal is greater than the threshold protection voltage;
and the response unit is connected with the comparison unit and used for receiving the response signal and controlling the main loop switch module to be disconnected according to the response signal.
4. The reverse battery protection circuit of claim 1, wherein the main loop switch module comprises:
the driving unit is connected with the control module and used for receiving the protection locking signal and generating a locking driving signal according to the protection locking signal;
and the discharge switch unit is connected with the driving unit and the battery module, and is used for receiving the locking driving signal and disconnecting according to the locking driving signal.
5. The reverse battery protection circuit of claim 4, wherein the main loop switch module further comprises:
the charging switch unit is connected with the driving unit and the discharging switch unit, and is used for receiving the charging driving signal generated by the driving unit and conducting on or off according to the charging driving signal;
the control module is further configured to generate a charging control signal to control the driving unit to generate the charging driving signal.
6. The reverse battery protection circuit of claim 5, wherein the discharge switch unit and the charge switch unit are N-type MOS transistors;
the discharging switch unit is connected with the charging switch unit in series, and the drain electrodes of the discharging switch unit and the charging switch unit are connected in common.
7. The reverse battery protection circuit of claim 3, wherein the response unit comprises: the response switch tube, the first resistor and the first diode;
the anode of the first diode is connected with the main loop switch module, the cathode of the first diode is connected with the first end of the response switch tube, the control end of the response switch tube and the first end of the first resistor are connected to the comparison unit in a shared mode, and the second end of the first resistor and the second end of the response switch tube are grounded.
8. The reverse battery protection circuit of claim 3, wherein the current sampling unit is a sampling resistor.
9. A battery pack, comprising: a battery module, and a reverse battery protection circuit as claimed in any one of claims 1 to 8.
10. An electronic device comprising the reverse battery protection circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222008734.7U CN218514090U (en) | 2022-07-29 | 2022-07-29 | Battery reverse connection protection circuit, battery pack and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222008734.7U CN218514090U (en) | 2022-07-29 | 2022-07-29 | Battery reverse connection protection circuit, battery pack and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN218514090U true CN218514090U (en) | 2023-02-21 |
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| CN202222008734.7U Active CN218514090U (en) | 2022-07-29 | 2022-07-29 | Battery reverse connection protection circuit, battery pack and electronic equipment |
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| CN (1) | CN218514090U (en) |
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- 2022-07-29 CN CN202222008734.7U patent/CN218514090U/en active Active
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