CN210136288U - Electronic equipment, battery state information transmission device and transmission circuit thereof - Google Patents
Electronic equipment, battery state information transmission device and transmission circuit thereof Download PDFInfo
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- CN210136288U CN210136288U CN201920443645.0U CN201920443645U CN210136288U CN 210136288 U CN210136288 U CN 210136288U CN 201920443645 U CN201920443645 U CN 201920443645U CN 210136288 U CN210136288 U CN 210136288U
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Abstract
The utility model provides an electronic equipment, battery state information transmission device and transmission circuit thereof, this battery state information transmission circuit passes through the electric current of electric core in the collection group battery of current collection module, and the voltage of electric core in the group battery is acquireed to the level conversion module, main control module acquires the state information of electric core in the group battery according to electric current and voltage, and then make pulse width modulation signal produce the module and produce pulse width modulation signal according to the state information of electric core, and send to electronic equipment through interface module, so that electronic equipment acquires the state information of electric core according to the duty cycle of pulse width modulation signal, it is when can feedback the state information of battery to electronic equipment in real time, circuit structure is simple.
Description
Technical Field
The present disclosure relates to the field of power supply technologies, and in particular, to an electronic device, a battery status information transmission apparatus, and a transmission circuit thereof.
Background
In recent years, with the performance improvement and rapid popularization of various electronic devices, people have been increasingly using for their daily use time, and it is self-evident that a battery capable of knowing the battery state of an electronic device in real time has become the most basic configuration of an electronic device as a battery for supplying an operating voltage to the electronic device.
At present, in order to solve the above problems, the battery in the prior art mainly completes communication with the electronic device through a synchronous communication mode. However, although this method can make the electronic device learn the communication status of the battery, it uses more ports in the communication process, which makes the circuit design complicated.
In summary, the conventional battery state information transmission circuit has a problem of complex circuit design due to a large number of communication ports.
Disclosure of Invention
The present disclosure is directed to an electronic device, a battery status information transmission apparatus and a transmission circuit thereof, so as to solve the problem of complicated circuit design caused by a large number of communication ports in the conventional battery status information transmission circuit.
The present disclosure is achieved in this way, and a first aspect of the present disclosure provides a battery state information transmission circuit including:
the battery pack is formed by connecting a plurality of battery cells in series;
the level conversion module is connected with the battery pack and acquires the voltage of a battery cell in the battery pack;
the current acquisition module is connected with the battery pack and acquires the current of a battery cell in the battery pack;
the main control module is connected with the level conversion module and the current acquisition module, acquires a voltage signal according to the voltage of the battery cell, acquires a current signal according to the current of the battery cell, and acquires state information of the battery cell in the battery pack according to the voltage signal and the current signal;
the pulse width modulation signal generation module is connected with the main control module and generates a pulse width modulation signal according to the state information of the battery core;
the interface module is connected with the pulse width modulation signal generation module, the main control module and the electronic equipment and sends the pulse width modulation signal to the electronic equipment so that the electronic equipment can obtain the state information of the battery cell according to the duty ratio of the pulse width modulation signal;
and the switch control module is connected with the main control module and controls the on-off of the current path of the battery cell under the action of the main control module.
A second aspect of the present disclosure provides a battery status information transmission apparatus including the battery status information transmission circuit of the first aspect.
A third aspect of the present disclosure provides an electronic device including the battery state information transmission apparatus according to the second aspect.
The utility model provides an electronic equipment, battery state information transmission device and transmission circuit thereof, this battery state information transmission circuit passes through the electric current of electric core in the collection group battery of current collection module, and the voltage of electric core in the group battery is acquireed to the level conversion module, main control module acquires the state information of electric core in the group battery according to electric current and voltage, and then make pulse width modulation signal produce the module and produce pulse width modulation signal according to the state information of electric core, and send to electronic equipment through interface module, so that electronic equipment acquires the state information of electric core according to the duty cycle of pulse width modulation signal, it is when can feedback the state information of battery to electronic equipment in real time, circuit structure is simple.
Drawings
To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a battery status information transmission circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a battery status information transmission circuit according to another embodiment of the present disclosure;
fig. 3 is a schematic circuit structure diagram of a battery status information transmission circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.
Furthermore, in the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the disclosed embodiments. However, it will be apparent to one skilled in the art that the present disclosure may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present disclosure with unnecessary detail.
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
In order to explain the technical solution of the present disclosure, the following description is given by way of specific examples.
The disclosed embodiment provides a battery state information transmission circuit 1, as shown in fig. 1, the battery state information transmission circuit 1 includes:
a battery pack 10 composed of a plurality of cells connected in series;
the level conversion module 11 is connected with the battery pack 10 and acquires the voltage of a battery cell in the battery pack 10;
the current acquisition module 12 is connected with the battery pack 10 and acquires the current of a battery cell in the battery pack 10;
the main control module 13 is connected to the level conversion module 11 and the current acquisition module 12, and is configured to acquire a voltage signal according to a voltage of the battery cell, acquire a current signal according to a current of the battery cell, and acquire state information of the battery cell in the battery pack 10 according to the voltage signal and the current signal;
the pulse width modulation signal generation module 14 is connected with the main control module 13 and generates a pulse width modulation signal according to the state information of the battery cell;
the interface module 15 is connected to the pwm signal generating module 14, the main control module 13, and an electronic device (not shown in the figure), and sends the pwm signal to the electronic device, so that the electronic device can obtain the state information of the battery cell according to the duty ratio of the pwm signal;
and the switch control module 16 is connected with the main control module 13 and controls the on-off of the current path of the battery cell under the action of the main control module 13.
In specific implementation, in the embodiment of the present disclosure, the battery pack 10 is formed by connecting two battery cells in series, but it can be understood by those skilled in the art that the battery pack may also be formed by connecting a plurality of batteries in series or in parallel, where the two battery cells shown in series are merely an example illustration of the battery pack and are not limited thereto; in addition, the level conversion module 11 and the current collection module 12 shown in the embodiment of the present disclosure may be implemented by using an existing circuit capable of obtaining a battery voltage and a battery current, and the specific working principle thereof may refer to the related prior art, which is not described herein again.
Further, in specific implementation, the main control module 13 may be implemented by a processing device with digital logic programming capability, such as a single chip, a field programmable gate array FPGA, an ARM processor, and the like, which is not limited herein.
In addition, in the embodiment of the present disclosure, the state information of the battery cells in the battery pack 10 includes, but is not limited to, a remaining capacity of the battery, a charging state, a discharging state of the battery, and the like, and the above states may be characterized by the duty ratio of the pulse width modulation signal PWM. Specifically, when the duty ratio of the PWM signal is less than 100%, the PWM signal may transmit the remaining capacity of the battery, for example, when the ratio of the high level duration to the low level duration of the PWM signal is 60%, it indicates that the remaining capacity of the battery is 60%; and, when the duty ratio of the PWM signal is greater than 100%, the PWM signal can transmit basic state information of the battery, for example when the ratio of the high level duration to the low level duration of the PWM signal is 2, it indicates that the basic state of the battery at this time is a fully charged state, and when the ratio of the high level duration to the low level duration of the PWM signal is 3, it indicates that the basic state of the battery at this time is a charging overvoltage state, when the ratio of the high level duration time to the low level duration time of the PWM signal is 4, it indicates that the basic state of the battery at this time is a discharging undervoltage state, when the ratio of the high level duration time to the low level duration time of the PWM signal is 9, the current basic state of the battery is that the discharging current exceeds the range to prohibit discharging, and when the ratio of the high level duration time to the low level duration time of the PWM signal is 10, the current basic state of the battery is that the charging current exceeds the range to prohibit charging.
It should be noted that, in the embodiment of the present disclosure, the ratio of the high level duration to the low level duration of the PWM signal for characterizing the basic state of the battery is only an exemplary illustration, and is not limited thereto, for example, when the ratio of the high level duration to the low level duration of the PWM signal is 11, it may also indicate that the basic state of the battery at this time is that the charging current is out of range to prohibit charging, which may be set according to the user's needs; the basic state information of the battery is described only by way of example, and is not limited to the battery being charged over-voltage, discharged under-voltage, discharged current out-of-range prohibiting discharge, charged current out-of-range prohibiting charge, and the like.
Further, in a specific implementation, the battery state information circuit may further include a temperature sensor (not shown in the figure), where the temperature sensor is connected to the electric core of the battery pack 10 and the main control module 13, and is configured to acquire temperature information of the electric core of the battery pack 10, and feed the acquired temperature information back to the main control module 13, so that the main control module 13 controls the PWM signal generation module 14 to generate a PWM signal capable of characterizing the battery temperature according to the temperature information, and further enables the electronic device to acquire the temperature state of the battery according to a duty ratio of the PWM signal, for example, when a ratio of a high-level duration time to a low-level duration time of the PWM signal is 5, it indicates that the basic state of the battery at this time is that the battery temperature is too high to prohibit charging, and when a ratio of the high-level duration time to the low-level duration time of the PWM signal is 6, it indicates that the basic state of the battery at this time is that, when the ratio of the high level duration time to the low level duration time of the PWM signal is 7, it indicates that the basic state of the battery at the time is that the battery temperature is too low to prohibit charging, and when the ratio of the high level duration time to the low level duration time of the PWM signal is 8, it indicates that the basic state of the battery at the time is that the battery temperature is too low to prohibit discharging.
It should be noted that, in the embodiment of the present disclosure, the ratio of the high level duration to the low level duration of the PWM signal for characterizing the temperature state of the battery is only an exemplary illustration, and is not limited thereto, for example, when the ratio of the high level duration to the low level duration of the PWM signal is 12, then it may also indicate that the basic state of the battery at this time is that the battery temperature is too high to prohibit charging, which may be set according to the user's needs.
In this embodiment, the current of the battery cell in the battery pack is collected through the current collection module, and the voltage of the battery cell in the battery pack is obtained through the level conversion module, the main control module obtains the state information of the battery cell in the battery pack according to the current and the voltage, and then the pulse width modulation signal generation module generates the pulse width modulation signal according to the state information of the battery cell, and sends the pulse width modulation signal to the electronic equipment through the interface module, so that the electronic equipment obtains the state information of the battery cell according to the duty ratio of the pulse width modulation signal, and the circuit structure is simple while the state information of the battery can be fed back to the electronic equipment in real.
In addition, the battery state information transmission circuit shown in the embodiment of the disclosure can also be provided with a temperature sensor in the circuit, so that the temperature sensor obtains the temperature of the battery cell in the battery pack during operation, the main control module controls the pulse width modulation signal generation module to generate a PWM signal capable of representing the battery temperature according to the temperature, and further, the electronic device can obtain the temperature state of the battery according to the duty ratio of the PWM signal, so as to prevent the battery from being in failure due to overhigh or overlow working temperature.
Further, as an embodiment of the present disclosure, as shown in fig. 3, the pwm signal generating module 14 includes: a first switching element M1, a second switching element M2, a first resistor R1, a second resistor R2, and a third resistor R3.
The control end of the first switch element M1 is connected to the main control module 13, the output end of the first switch element M1 is connected to the first end of the first resistor R1, the input end of the first switch element M1 is grounded, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the control end of the second switch element M2, the second end of the second resistor R2 is connected to the input end of the second switch element M2 and the positive end of the battery pack 10, the output end of the second switch element M2 is connected to the first end of the third resistor R3, and is connected to the interface module 15, and the second end of the third resistor R3 is connected to the interface module 15.
In specific implementation, the first switch element M1 is an NMOS transistor, a gate of the NMOS transistor is a control terminal of the first switch element M1, a drain of the NMOS transistor is an input terminal of the first switch element M1, and a source of the NMOS transistor is an output terminal of the first switch element M1; the second switch element M2 is a PMOS transistor, the gate of the PMOS transistor is the control terminal of the second switch element M1, the drain of the PMOS transistor is the output terminal of the second switch element M1, and the source of the PMOS transistor is the input terminal of the second switch element M1.
It should be noted that, in the embodiment of the present disclosure, the first switching element M1 and the second switching element M2 may also be implemented by using other devices having a switching function, for example, the first switching element M1 is implemented by using an N-type triode, and the second switching element M2 is implemented by using a P-type triode, which is not limited herein; in addition, the specific circuit of the pwm signal generation block 14 shown in fig. 3 is only an exemplary illustration of the pwm signal generation block 14, and is not limited thereto.
Further, as an embodiment of the present disclosure, as shown in fig. 3, the switch control module 16 includes a third switching element M3 and a fourth switching element M4.
The control end of the third switching element M3 is connected to the main control module 13, the input end of the third switching element M3 is connected to the current collection module 12, the output end of the third switching element M3 is connected to the input end of the fourth switching element M4, the control end of the fourth switching element M4 is connected to the main control module 13, and the output end of the fourth switching element M4 is connected to the interface module 15.
In specific implementation, the third switching element M3 and the fourth switching element M4 are NMOS transistors, gates of the NMOS transistors are control terminals of the third switching element M3 and the fourth switching element M4, drains of the NMOS transistors are input terminals of the third switching element M3 and the fourth switching element M4, and sources of the NMOS transistors are output terminals of the third switching element M3 and the fourth switching element M4.
It should be noted that, in the embodiment of the present disclosure, the third switching element M3 and the fourth switching element M4 may also be implemented by other devices having a switching function, for example, the third switching element M3 and the fourth switching element M4 may be implemented by an N-type triode, a relay, an Insulated Gate Bipolar Transistor (IGBT), and the like, which is not limited herein; in addition, the specific circuit of the switch control module 16 shown in fig. 3 is merely an exemplary illustration of the switch control module 16, and is not limited thereto.
Further, as an embodiment of the present disclosure, as shown in fig. 2, the battery state information transmission circuit 1 further includes a state display module 17, and the state display module 7 is connected to the main control module 13 and performs primary display on the state information of the battery cell.
In specific implementation, in this embodiment of the present disclosure, the primary display of the state information of the battery refers to a supplementary display of the remaining capacity, the charging amount, and the like of the battery in the battery pack according to the state information of the battery cell sent by the main control module 13.
In the embodiment of the present disclosure, the state display module 17 is disposed in the battery state information transmission circuit, so that the state display module 17 can perform supplementary display on the state information of the remaining capacity, the charging capacity, and the like of the battery, and further, the user can know the state of charge of the battery conveniently.
Further, as an embodiment of the present disclosure, as shown in fig. 3, the state display module 17 includes;
a first light emitting diode D1, a second light emitting diode D2, a third light emitting diode D3, and a fourth light emitting diode D4.
The anode of the first led D1 and the anode of the second led D2 are connected in common and receive the operating voltage VEE, the cathode of the first led D1 and the cathode of the second led D2 are both connected to the main control module 13, the anode of the third led D3 and the anode of the fourth led D4 are connected in common and receive the operating voltage VEE, and the cathode of the third led D3 and the cathode of the fourth led D4 are both connected to the main control module 13.
In the embodiment of the present disclosure, the remaining capacity and the charging capacity of the battery are exemplarily described only by the manner of the indicator light, and the display manner is not limited thereto, for example, the remaining capacity and the charging capacity of the battery may be displayed and described by the manner of sound, text information, picture information, and the like; in addition, the specific circuit of the status display module 17 shown in fig. 3 is merely an exemplary illustration of the status display module 17, which is not limited thereto; in addition, the first to fourth light emitting diodes D1 to D4 may be light emitting diodes emitting light of the same color, or may be light emitting diodes emitting light of different colors, and are not particularly limited herein.
The following describes a specific operation principle of the battery status information transmission circuit 1 according to the embodiment of the present disclosure by taking the circuit shown in fig. 3 as an example, and the detailed description is as follows:
as shown in fig. 3, when the battery state information works, the level conversion module 11 obtains the voltage of the battery cell in the battery pack 10, converts the voltage into a voltage signal that can be collected by the main control module 13, and sends the voltage signal to the main control module 13, and the current collection module 12 obtains the current of the battery cell in the battery pack 10, converts the current signal into a current signal that can be collected by the main control module 13, and sends the current signal to the main control module 13. After receiving the voltage signal acquired by the level conversion module 11 and the current signal acquired by the current acquisition module 12, the main control module 13 acquires state information of a battery cell in the battery pack 10 according to the voltage signal and the current signal, and controls the first switching element M1 and the second switching element M2 in the pulse width modulation signal generation module 14 to perform corresponding on-off according to the state of the battery cell, so that the pulse width modulation signal generation module 14 generates a pulse width modulation signal capable of representing battery state information under the control of the pulse width modulation signal, and further transmits the pulse width modulation signal to the electronic device through the interface JP1, so that the electronic device acquires the state information of the battery cell according to the duty ratio of the pulse width modulation signal.
In addition, when the state information of the battery cell is overvoltage or overcurrent, the main control module 13 may further control the third switching element M3 and the fourth switching element M4 in the switch control module 16 to be turned off, so as to prevent the battery in the battery pack 10 from failing due to overvoltage or overcurrent, thereby improving the service life of the battery pack 10, and when the state information of the battery cell shows that the battery cell in the battery pack 10 works normally, the main control module 13 controls the third switching element M3 and the fourth switching element M4 in the switch module 16 to be turned on, so as to facilitate the normal operation of the battery state information transmission circuit 1.
Further, the main control module 13 may further send the state information of the battery cell to the state display module 17, so that the first light emitting diode D1, the second light emitting diode D2, the third light emitting diode D3, and the fourth light emitting diode D4 in the state display module 17 emit light or do not emit light according to the state information, thereby performing supplementary display on the state information of the battery cell, such as the remaining power amount, the charging amount, and the like.
Further, the present disclosure also provides a battery state information transmission apparatus including the state information transmission circuit 1. It should be noted that, since the battery state information transmission circuit of the battery state information transmission device provided in the embodiment of the present disclosure is the same as the battery state information transmission circuit 1 shown in fig. 1 to 3, the detailed description about fig. 1 to 3 may be referred to for the specific working principle of the battery state information transmission circuit 1 in the battery state information transmission device provided in the embodiment of the present disclosure, and is not repeated herein.
Further, the present disclosure also provides an electronic device including the battery state information transmission apparatus. It should be noted that, since the battery state information transmission device of the electronic device provided in the embodiment of the present disclosure is the same as the aforementioned battery state information transmission device, the specific working principle of the battery state information transmission device in the electronic device provided in the embodiment of the present disclosure may refer to the foregoing related description, and is not repeated herein.
In the embodiment of the disclosure, the current of the battery cell in the battery pack is collected through the current collection module, the voltage of the battery cell in the battery pack is obtained through the level conversion module, the main control module obtains the state information of the battery cell in the battery pack according to the current and the voltage, and then the pulse width modulation signal generation module generates the pulse width modulation signal according to the state information of the battery cell, and the pulse width modulation signal is sent to the electronic equipment through the interface module, so that the electronic equipment obtains the state information of the battery cell according to the duty ratio of the pulse width modulation signal, the circuit structure is simple while the state information of the battery can be fed back to the electronic equipment in real time, and the problem that the circuit design is complex due to multiple communication ports in the existing battery state information transmission circuit is solved.
The above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure 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 disclosure, and are intended to be included within the scope of the present disclosure.
Claims (10)
1. A battery status information transmission circuit, characterized in that the battery status information transmission circuit comprises:
the battery pack is formed by connecting a plurality of battery cells in series;
the level conversion module is connected with the battery pack and acquires the voltage of a battery cell in the battery pack;
the current acquisition module is connected with the battery pack and acquires the current of a battery cell in the battery pack;
the main control module is connected with the level conversion module and the current acquisition module, acquires a voltage signal according to the voltage of the battery cell, acquires a current signal according to the current of the battery cell, and acquires state information of the battery cell in the battery pack according to the voltage signal and the current signal;
the pulse width modulation signal generation module is connected with the main control module and generates a pulse width modulation signal according to the state information of the battery core;
the interface module is connected with the pulse width modulation signal generation module, the main control module and the electronic equipment and sends the pulse width modulation signal to the electronic equipment so that the electronic equipment can obtain the state information of the battery cell according to the duty ratio of the pulse width modulation signal;
and the switch control module is connected with the main control module and controls the on-off of the current path of the battery cell under the action of the main control module.
2. The battery status information transmission circuit according to claim 1, wherein the pulse width modulation signal generation module comprises:
a first switching element, a second switching element, a first resistor, a second resistor, and a third resistor;
the control end of the first switch element is connected with the main control module, the output end of the first switch element is connected with the first end of the first resistor, the input end of the first switch element is grounded, the second end of the first resistor is connected with the first end of the second resistor and the control end of the second switch element, the second end of the second resistor is connected with the input end of the second switch element and the positive end of the battery pack, the output end of the second switch element is connected with the first end of the third resistor in a common mode and connected with the interface module, and the second end of the third resistor is connected with the interface module.
3. The battery state information transmission circuit according to claim 2, wherein the first switching element is an NMOS transistor, a gate of the NMOS transistor is a control terminal of the first switching element, a drain of the NMOS transistor is an input terminal of the first switching element, and a source of the NMOS transistor is an output terminal of the first switching element.
4. The battery state information transmission circuit according to claim 2, wherein the second switching element is a PMOS transistor, a gate of the PMOS transistor is a control terminal of the second switching element, a drain of the PMOS transistor is an output terminal of the second switching element, and a source of the PMOS transistor is an input terminal of the second switching element.
5. The battery status information transmission circuit according to claim 1, wherein the switch control module comprises:
a third switching element and a fourth switching element;
the control end of the third switch element is connected with the main control module, the input end of the third switch element is connected with the current acquisition module, the output end of the third switch element is connected with the input end of the fourth switch element, the control end of the fourth switch element is connected with the main control module, and the output end of the fourth switch element is connected with the interface module.
6. The battery state information transmission circuit according to claim 5, wherein the third switching element and the fourth switching element are NMOS transistors, gates of the NMOS transistors are control terminals of the third switching element and the fourth switching element, drains of the NMOS transistors are input terminals of the third switching element and the fourth switching element, and sources of the NMOS transistors are output terminals of the third switching element and the fourth switching element.
7. The battery state information transmission circuit of any one of claims 1 to 6, further comprising a state display module, connected to the main control module, and configured to perform primary display on the state information of the battery cells.
8. The battery status information transmission circuit according to claim 7, wherein the status display module includes;
a first light emitting diode, a second light emitting diode, a third light emitting diode, and a fourth light emitting diode;
the anode of the first light emitting diode and the anode of the second light emitting diode are connected in common and receive working voltage, the cathode of the first light emitting diode and the cathode of the second light emitting diode are both connected with the main control module, the anode of the third light emitting diode and the anode of the fourth light emitting diode are connected in common and receive working voltage, and the cathode of the third light emitting diode and the cathode of the fourth light emitting diode are both connected with the main control module.
9. A battery state information transmission apparatus, characterized in that the battery state information transmission apparatus comprises a battery state information transmission circuit according to any one of claims 1 to 8.
10. An electronic device characterized by comprising the battery state information transmission apparatus according to claim 9.
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| CN112595984A (en) * | 2020-12-14 | 2021-04-02 | 珠海格力电器股份有限公司 | Lithium battery voltage detection method and device, electrical equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112595984A (en) * | 2020-12-14 | 2021-04-02 | 珠海格力电器股份有限公司 | Lithium battery voltage detection method and device, electrical equipment and storage medium |
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