CN113472035A - Lithium battery work control method and system and electric equipment - Google Patents

Lithium battery work control method and system and electric equipment Download PDF

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Publication number
CN113472035A
CN113472035A CN202110694472.1A CN202110694472A CN113472035A CN 113472035 A CN113472035 A CN 113472035A CN 202110694472 A CN202110694472 A CN 202110694472A CN 113472035 A CN113472035 A CN 113472035A
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China
Prior art keywords
current
negative terminal
lithium battery
path
terminal buck
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CN202110694472.1A
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Chinese (zh)
Inventor
唐森群
王景德
张�雄
李辉腾
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Shenzhen Topband Co Ltd
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Shenzhen Topband Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/448—End of discharge regulating measures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention is suitable for the technical field of lithium batteries, and provides a lithium battery work control method, a lithium battery work control system and electric equipment, wherein the method comprises the steps of detecting the discharge current and the output voltage of the lithium battery work in real time, and judging whether the current discharge current is greater than an overcurrent threshold value or not; if yes, disconnecting the main path and connecting the negative terminal BUCK path; controlling a negative terminal BUCK passage to gradually reduce the current discharging current, and detecting and judging whether the current output voltage is reduced to the lowest operation voltage; when the current output voltage is detected to be reduced to the lowest operation voltage, controlling a negative terminal BUCK passage to stop reducing the current discharging current; when the current discharging current controlled by the negative terminal BUCK passage is detected to be reduced to the preset discharging current, the detected current output voltage is still larger than the lowest operation voltage, and the negative terminal BUCK passage is controlled to stop reducing the current discharging current. The lithium battery work control method provided by the invention solves the problem that the current lithium battery is dangerous because the battery management system controls the direct power-off of the lithium battery when the current lithium battery is in overcurrent.

Description

Lithium battery work control method and system and electric equipment
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery work control method and system and electric equipment.
Background
The conventional electric equipment such as an electric vehicle adopts a lead-acid battery as a power source, the corresponding power is larger when the current is larger, the voltage of the lead-acid battery is lower and lower when the battery is not charged, the reduction speed is higher, the output current capability is poorer and poorer, but the power cannot be directly cut off, so that the electric vehicle can be slowly ridden, the speed is lower and lower, a user can obviously sense that the battery is not charged, and the user can stop or step on the operation of braking and the like, so that the danger cannot be caused to the user.
However, because of the disadvantages of low energy density, short service cycle life, large volume and mass of lead-acid batteries, more and more electric devices select lithium batteries with high energy density, long service life and small volume and mass as power sources. Meanwhile, since over-discharge, over-current, or over-temperature of a lithium BATTERY may reduce the service life of the BATTERY, or even discard the lithium BATTERY, a BMS system (BATTERY management system) is usually configured in a BATTERY pack including a plurality of lithium BATTERY cells to intelligently manage and maintain the BATTERY cells, so as to protect the over-discharge, over-current, or over-temperature.
The conventional BMS system only has an on or off function, so that the output or the output stop of the lithium battery can be realized, but the lithium battery platform is relatively stable, and the voltage of the lithium battery is kept in a high state even in a low-power state, so that the electric equipment is relatively powerful in the riding process; and when the abnormal conditions such as lithium cell group does not have the electricity or the battery is overdischarged, it can directly trigger the protection of BMS system for its BMS system can control the direct power failure of lithium cell group and in order to turn off the output of lithium cell group, therefore electric equipment probably causes the risk that the vehicle is out of control when cutting off the power supply suddenly in the in-process of riding, its vehicle instrument does not have the electricity, electric equipment driving system does not have the electricity, make the user can't normally ride to the target place, even because illumination and the braking system of vehicle cut off the power supply suddenly and lead to dangerous emergence, if can take place the phenomenon of falling back and seriously influence user's safety when going up very steep slope.
Disclosure of Invention
The embodiment of the invention aims to provide a lithium battery working control method, and aims to solve the problem that a battery management system controls direct power-off of a lithium battery when the conventional lithium battery is in overcurrent, so that danger is caused.
The embodiment of the invention is realized in such a way that a lithium battery work control method is applied to electric equipment, and the method comprises the following steps:
detecting the discharge current and the output voltage of the lithium battery in the working process of the electric equipment in real time, and judging whether the current discharge current is greater than an overcurrent threshold value or not;
if so, disconnecting the main passage between the battery cathode and the port cathode and communicating a negative terminal BUCK passage between the battery cathode and the port cathode;
controlling a negative terminal BUCK passage to gradually reduce the current discharging current, and detecting and judging whether the current output voltage is reduced to the lowest operation voltage in the synchronous reduction process;
when the current output voltage is detected to be reduced to the lowest operation voltage, controlling a negative terminal BUCK passage to stop reducing the current discharge current so as to enable the output voltage of the lithium battery to be not lower than the lowest operation voltage when the lithium battery works and carry out normal work;
when the current discharging current controlled by the negative terminal BUCK path is detected to be reduced to the preset discharging current, and the detected current output voltage is still larger than the lowest operation voltage, the negative terminal BUCK path is controlled to stop reducing the current discharging current, so that the negative terminal BUCK path limits the current discharging current to the preset discharging current.
Further, the step of controlling the negative side BUCK path to gradually reduce the present discharge current includes:
and dynamically and gradually adjusting the duty ratio for controlling the output of the negative terminal BUCK passage according to the difference value of the current discharging current exceeding the overcurrent threshold value so as to gradually reduce the current discharging current.
Further, the step of dynamically adjusting the duty ratio for controlling the output of the negative side BUCK path step by step according to the difference value of the current discharging current exceeding the over-current threshold value includes:
dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path, and detecting whether the difference value of the current discharge current exceeding the overcurrent threshold value is increased;
if yes, continuously and dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path;
if not, the duty ratio for controlling the output of the negative terminal BUCK path is dynamically increased, and the exceeding difference is kept to be gradually reduced.
Still further, the method further comprises:
after the negative terminal BUCK access communicated between the negative electrode of the battery and the negative electrode of the port is communicated for a first preset time, switching the on-off of the main access and the negative terminal BUCK access so as to communicate the main access between the negative electrode of the battery and the negative electrode of the port and disconnect the negative terminal BUCK access between the negative electrode of the battery and the negative electrode of the port.
Still further, the method further comprises:
and when the continuous times of switching the on and off of the main channel and the negative terminal BUCK channel are detected to be greater than the first preset times within the second preset time and the current discharge current is judged to be still greater than the overcurrent threshold, disconnecting the main channel and the negative terminal BUCK channel between the negative electrode of the battery and the negative electrode of the port.
Another embodiment of the present invention is also directed to a lithium battery operation control system applied to an electric device, the system including:
the current detection and judgment module is used for detecting the discharge current and the output voltage of the lithium battery in the working process of the electric equipment in real time and judging whether the current discharge current is greater than an overcurrent threshold value or not;
the first path switching module is used for disconnecting the main path between the cathode of the battery and the cathode of the port and communicating a negative terminal BUCK path between the cathode of the battery and the cathode of the port when the current detection judging module judges that the current discharging current is larger than the overcurrent threshold;
the current limiting control module is used for controlling the negative terminal BUCK passage to gradually reduce the current discharging current and detecting and judging whether the current output voltage is reduced to the lowest operation voltage in the synchronous reduction process;
the first stop control module is used for controlling the negative terminal BUCK passage to stop reducing the current discharging current when detecting that the current output voltage is reduced to the lowest operation voltage, so that the output voltage of the lithium battery is not lower than the lowest operation voltage when the lithium battery works to carry out normal work;
and the second stop control module is used for controlling the negative terminal BUCK passage to stop reducing the current discharging current when the current discharging current controlled by the negative terminal BUCK passage is detected to be reduced to the preset discharging current and the detected current output voltage is still larger than the lowest operation voltage, so that the negative terminal BUCK passage limits the current discharging current to the preset discharging current.
Further, the current limiting control module includes:
and the duty ratio adjusting unit is used for dynamically and gradually adjusting the duty ratio for controlling the output of the negative terminal BUCK passage according to the difference value of the current discharging current exceeding the overcurrent threshold value so as to gradually reduce the current discharging current.
Further, the duty ratio adjusting unit is configured to:
dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path, and detecting whether the difference value of the current discharge current exceeding the overcurrent threshold value is increased;
if yes, continuously and dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path;
if not, the duty ratio for controlling the output of the negative terminal BUCK path is dynamically increased, and the exceeding difference is kept to be gradually reduced.
Further, the system further comprises:
and the second channel switching module is used for switching the connection and disconnection of the main channel and the negative terminal BUCK channel after the first channel switching module works for a first preset time so as to connect the main channel between the negative pole of the battery and the negative pole of the port and disconnect the negative terminal BUCK channel between the negative pole of the battery and the negative pole of the port.
Further, the system further comprises:
and the path disconnecting module is used for disconnecting the main path and the negative terminal BUCK path between the negative pole of the battery and the negative pole of the port when the continuous times of switching the main path and the negative terminal BUCK path are detected to be greater than the first preset times within the second preset time and the current discharging current is judged to be still greater than the overcurrent threshold.
Another embodiment of the present invention further provides an electric device, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the electric device executes the lithium battery operation control method.
According to the lithium battery work control method provided by the embodiment of the invention, when the normal output current work of the lithium battery is detected, the main access is controlled to communicate the battery cathode of the lithium battery with the port cathode to realize normal work; when detecting that the output discharge current of the lithium battery is larger than the overcurrent threshold value, controlling a negative terminal BUCK passage to be communicated with the battery negative electrode and the port negative electrode of the lithium battery, so that, in the process of limiting the current through the negative side BUCK path and controlling the current limiting of the negative side BUCK path, the output voltage is correspondingly detected to ensure that the output voltage is not reduced to be lower than the lowest operation voltage in the process of reducing the output voltage to realize the current output of the lithium battery pack, at the moment, the current loop can realize the adjustment of the discharge current to a set range through the double-loop control of the voltage loop and the current loop, and the voltage ring avoids the output voltage of the lithium battery pack to be lower than the minimum operating voltage, so that the output regulation of the discharge current of the lithium battery pack is carried out under the condition that the lithium battery pack can work, and the problem that the existing lithium battery management system controls the direct power-off of the lithium battery when the current lithium battery is over-current and is dangerous is solved.
Drawings
Fig. 1 is a flowchart of a lithium battery operation control method according to an embodiment of the present invention;
fig. 2 is another flowchart of a lithium battery operation control method according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a lithium battery operation control system according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a lithium battery operation control system according to an embodiment of the present invention;
fig. 5 is a circuit structure diagram of a specific application circuit of the lithium battery operation control method according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further 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 invention and are not intended to limit the invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
According to the invention, when the normal output current of the lithium battery is detected to work, the main passage is controlled to communicate the battery cathode of the lithium battery with the port cathode to realize normal work; when detecting that the output discharge current of the lithium battery is larger than the overcurrent threshold value, controlling a negative terminal BUCK passage to be communicated with the battery negative electrode and the port negative electrode of the lithium battery, so that, in the process of limiting the current through the negative side BUCK path and controlling the current limiting of the negative side BUCK path, the output voltage is correspondingly detected to ensure that the output voltage is not reduced to be lower than the lowest operation voltage in the process of reducing the output voltage to realize the current output of the lithium battery pack, at the moment, the current loop can realize the adjustment of the discharge current to a set range through the double-loop control of the voltage loop and the current loop, and the voltage ring avoids the output voltage of the lithium battery pack to be lower than the minimum operating voltage, so that the output regulation of the discharge current of the lithium battery pack is carried out under the condition that the lithium battery pack can work, and the problem that the existing lithium battery management system controls the direct power-off of the lithium battery when the current lithium battery is over-current and is dangerous is solved.
Example one
Referring to fig. 1, which is a schematic flow chart of a lithium battery operation control method according to a first embodiment of the present invention, for convenience of description, only a part related to the embodiment of the present invention is shown, where the lithium battery operation control method is applied to an electric device, and the method includes:
step S10, detecting the discharge current and output voltage of the lithium battery in the working process of the electric equipment in real time, and judging whether the current discharge current is larger than the overcurrent threshold value;
in an embodiment of the present invention, the lithium battery operation control method is applied to an electric device, such as an electric vehicle, wherein the electric device in the embodiment uses a lithium battery pack formed by a plurality of lithium battery units as a power source, and the electric device is also equipped with a BMS battery management system, the BMS system of the electric device is disposed between the lithium battery pack and the electric device, and the BMS system of the electric device can realize several functions including, but not limited to: (1) measurement of battery terminal voltage; (2) energy balance among the single batteries: namely, the single batteries are charged in an equalizing way, so that each single battery in the battery pack reaches a balanced and consistent state; (3) measuring the total voltage of the battery pack; (4) measuring the total current of the battery pack; (5) and (3) SOC calculation: namely, the State of Charge (SOC) of the battery pack, namely the residual electric quantity of the battery is accurately estimated, the SOC is ensured to be maintained in a reasonable range, and the damage to the battery due to overcharge or over-discharge is prevented; (6) dynamically monitoring the working state of the battery pack: in the charging and discharging process of the battery pack, the terminal voltage and temperature, the charging and discharging current and the total voltage of the battery pack of each single battery in the battery pack are collected in real time, and the overcharge or overdischarge phenomenon of the batteries is prevented; (7) displaying the real-time data; (8) data recording and analyzing, and simultaneously selecting problematic batteries to keep the reliability and high efficiency of the operation of the whole battery pack; (9) and the communication networking function is connected with the server end for communication through the wireless communication module.
In this embodiment, when the electric device is in operation, the BMS detects parameter information of the operation of the lithium battery in real time, wherein the parameter information includes, but is not limited to, a discharge current, a discharge power, an output voltage, a remaining battery capacity, and a temperature, and the parameter information is mainly parameter information that the BMS system protects once exceeding a corresponding set threshold range in the prior art.
Specifically, in the embodiment of the present invention, a circuit structure applied to the lithium battery operation control method is shown in fig. 5, and includes a lithium battery pack, a control IC connected to the lithium battery pack, a sampling resistor Rs connected to the lithium battery pack and the control IC for current sampling, a main path connected to a first discharge end DSG1 of the control IC, a negative end BUCK path connected to a second discharge end DSG2 of the control IC, and an external device respectively connected to the main path and the negative end BUCK path; the external device may be a charger (adapter) or a load (e.g., an electric device). The main path is a circuit structure for realizing normal power supply control of a lithium battery pack to an external load such as an electric device in the prior art, and the negative terminal BUCK path is a circuit structure for performing output current limiting on the lithium battery pack, which is added in the embodiment and is different from the existing main path. The battery anode B + of the lithium battery pack is directly connected with the port anode P +, the port cathode P-and the port anode P + of the lithium battery pack are used for being connected with external equipment, a main passage and a negative end BUCK passage are connected between the battery cathode B-and the port cathode P-, and at the moment, when the BMS system is in a normal working state, the BMS system controls and communicates the main passage between the battery cathode and the port cathode and disconnects the negative end BUCK passage between the battery cathode and the port cathode, so that the BMS system can carry out normal discharge output through the main passage, and the lithium battery pack can directly carry out output power supply for the electric equipment so as to provide normal working power supply for the electric equipment.
Specifically, in one embodiment of the present invention, referring to fig. 5, the main path includes a first discharge MOS transistor Q1, the source of the first discharge MOS transistor Q1 is connected to one end of a sampling resistor Rs, the gate of the first discharge MOS transistor Q1 is connected to the first discharge terminal DSG1 of the control IC, the drain of the first discharge MOS transistor Q1 is connected to the port cathode P-, wherein the other end of the sampling resistor Rs is connected to the battery cathode B-of the lithium battery pack. The negative terminal BUCK circuit comprises a second discharge MOS tube Q2, a first diode D1, a first inductor L1 and a first terminal capacitor C1, wherein the source electrode of the second discharge MOS tube Q2 is connected with a sampling resistor Rs, the grid electrode of the second discharge MOS tube Q2 is connected with a second discharge terminal DSG2 of the control IC, the drain electrode of the second discharge MOS tube Q2 is connected with the positive electrode of the first diode D1 and one end of a first inductor L1, the negative electrode of the first diode D1 is connected with the positive electrode B + and the positive electrode P + of a battery pack lithium battery, the other end of the first inductor L1 is connected with one end of the first capacitor C1 and the negative electrode P-of a port, and the other end of the first capacitor C1 is connected with the positive electrode B + and the positive electrode P + of the battery pack lithium battery pack. It should be noted that the circuit structure in practical use should also include a charging part such as a charging MOS transistor, but it is not the point of the invention in the embodiment of the present invention, and therefore specific identification is not performed, and it is consistent with the structure in the prior art, and details are not described herein. Meanwhile, it should be noted that the negative terminal BUCK path can also adopt other circuit structures which can realize the functions of the prior art to form the BUCK circuit. In addition, in the prior art, the circuit structure that can arbitrarily control the operation of the charging MOS transistor and the discharging MOS transistor of the BMS system may also be the circuit structure adopted by the lithium battery operation control method applied in the present application, and the circuit structure in the battery pack in the electric device is correspondingly set according to the actual use requirement, which is not specifically limited herein.
The BMS system monitors and judges whether the current discharge current of the BMS system is larger than an overcurrent threshold value in real time while detecting the parameter information of the lithium battery work in the working process of the electric equipment in real time.
In the embodiment of the present invention, when it is determined that the current discharging current is greater than the overcurrent threshold, step S20 is executed; otherwise, the normal working state is executed, namely the normal working state is controlled to be communicated with a main passage between the cathode of the battery and the cathode of the port, and a negative end BUCK passage between the cathode of the battery and the cathode of the port is disconnected.
Step S20, disconnecting the main path between the negative pole of the battery and the negative pole of the port and connecting the negative end BUCK path between the negative pole of the battery and the negative pole of the port;
in the embodiment of the invention, when the current discharge current is judged to be larger than the overcurrent threshold value, the BMS system controls to disconnect the main passage between the cathode of the battery and the cathode of the port and to connect the negative terminal BUCK passage between the cathode of the battery and the cathode of the port, so that the negative terminal BUCK passage limits the output magnitude of the discharge current, and the current output of the lithium battery pack can be limited. At this time, due to the current limiting operation of the negative terminal BUCK path, the discharge current output to the electric equipment can be limited to be within the safe discharge current range.
Specifically, for example, when the electric device is on a steep slope, and the lithium battery pack of the electric device is in a state of less electric quantity, and the BMS system detects that the battery discharge current is larger than the corresponding set threshold range and is too large, it is determined that the lithium battery pack is in an overcurrent at this time, and the BMS system in the prior art directly turns off the main path (i.e., the discharge MOS transistor in the prior art) according to the detected excessive discharge current so as to disconnect the current output, and the electric device is likely to have a back-slip phenomenon due to the loss of power at this time.
Step S30, controlling the negative terminal BUCK path to gradually reduce the current discharging current, and detecting and judging whether the current output voltage is reduced to the lowest operation voltage in the synchronous reduction process;
in the embodiment of the invention, after the control is switched to the negative-side BUCK passage, the BMS controls the output current and the output voltage output to the electric device after passing through the negative-side BUCK passage to gradually decrease, specifically, the BMS controls the conduction duty ratio for driving the second discharging MOS transistor Q2 to operate so as to realize the adjustment of the output current to gradually decrease, thereby avoiding the problem that the electric device is damaged due to the excessive output current of the lithium battery pack, and simultaneously, the output current is correspondingly fed back to the front-end lithium battery pack through the adjustment of the negative-side BUCK passage, so that the discharging current during the operation of the lithium battery pack is gradually decreased and the output voltage is correspondingly and synchronously decreased.
It should be noted that, when the current output voltage output by the lithium battery pack is lower than the lowest operation voltage, the lithium battery pack is powered off, so that the negative terminal BUCK channel is prevented from carrying out current limitation, the output voltage is reduced to be lower than the lowest operation voltage in the synchronous reduction process and the lithium battery pack cannot work, and the BMS system controls the negative terminal BUCK channel to gradually reduce the current discharging current and simultaneously detects and judges whether the current output voltage is reduced to be the lowest operation voltage in the synchronous reduction process.
Step S40, when the current output voltage is detected to be reduced to the lowest operation voltage, controlling the negative terminal BUCK path to stop reducing the current discharging current, so that the output voltage of the lithium battery is not lower than the lowest operation voltage when the lithium battery works, and the lithium battery works normally;
when the fact that the current output voltage is reduced to the lowest operation voltage in the synchronous reduction process is detected, the BMS system controls the negative terminal BUCK circuit to stop reducing the current discharging current, the situation that the output voltage of the lithium battery pack is lower than the lowest operation voltage and cannot work is avoided, and the output voltage of the lithium battery pack during working is not lower than the lowest operation voltage and can work normally at the moment.
Step S50, when the current discharging current controlled by the negative terminal BUCK path is detected to be reduced to the preset discharging current and the detected current output voltage is still larger than the lowest operation voltage, controlling the negative terminal BUCK path to stop reducing the current discharging current so that the negative terminal BUCK path limits the current discharging current to the preset discharging current;
in the process of detecting the synchronous reduction of the current output voltage, if the detected current output voltage is still larger than the lowest operation voltage when the current discharge current is detected to be reduced to the preset discharge current, the current discharge current is stopped to be reduced according to the reduction of the current discharge current to the preset discharge current, and the situation that the current discharge current is reduced until the output current is too small to effectively drive the electric equipment is avoided.
Therefore, through the dual-loop control of the voltage loop and the current loop in the embodiment, the current loop can adjust the discharging current to a set range, the voltage loop prevents the output voltage of the lithium battery pack from being lower than the minimum operating voltage, and the output adjustment of the discharging current is performed on the lithium battery pack under the condition that the lithium battery pack can work.
In the embodiment, when the normal output current of the lithium battery is detected to work, the main channel is controlled to be communicated with the battery cathode of the lithium battery and the port cathode of the lithium battery to realize normal work; when detecting that the output discharge current of the lithium battery is larger than the overcurrent threshold value, controlling a negative terminal BUCK passage to be communicated with the battery negative electrode and the port negative electrode of the lithium battery, so that, in the process of limiting the current through the negative side BUCK path and controlling the current limiting of the negative side BUCK path, the output voltage is correspondingly detected to ensure that the output voltage is not reduced to be lower than the lowest operation voltage in the process of reducing the output voltage to realize the current output of the lithium battery pack, at the moment, the current loop can realize the adjustment of the discharge current to a set range through the double-loop control of the voltage loop and the current loop, and the voltage ring avoids the output voltage of the lithium battery pack to be lower than the minimum operating voltage, so that the output regulation of the discharge current of the lithium battery pack is carried out under the condition that the lithium battery pack can work, and the problem that the existing lithium battery management system controls the direct power-off of the lithium battery when the current lithium battery is over-current and is dangerous is solved.
Example two
Referring to fig. 2, a schematic flow chart of a lithium battery operation control method according to a second embodiment of the present invention is shown, and for convenience of description, only a part related to the embodiment of the present invention is shown, where the lithium battery operation control method is applied to an electric device, and the method includes:
and step S11, detecting the discharge current and the output voltage of the lithium battery in the working process of the electric equipment in real time, and judging whether the current discharge current is greater than an overcurrent threshold value.
And step S21, disconnecting the main passage between the battery cathode and the port cathode and connecting the negative terminal BUCK passage between the battery cathode and the port cathode.
Step S31, controlling the negative terminal BUCK path to gradually reduce the current discharging current, and detecting and judging whether the current output voltage is reduced to the lowest operation voltage in the synchronous reduction process;
in an embodiment of the present invention, the step of controlling the negative terminal BUCK path to gradually decrease the current discharging current includes:
and dynamically and gradually adjusting the duty ratio for controlling the output of the negative terminal BUCK passage according to the difference value of the current discharging current exceeding the overcurrent threshold value so as to gradually reduce the current discharging current.
Specifically, the step of dynamically and gradually adjusting the duty ratio for controlling the output of the negative terminal BUCK path according to the difference value of the current discharging current exceeding the overcurrent threshold comprises the following steps:
firstly, dynamically reducing a duty ratio for controlling the output of the negative terminal BUCK path, and detecting whether the difference value of the current discharge current exceeding an overcurrent threshold value is increased;
if yes, continuously and dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path;
if not, dynamically increasing the duty ratio for controlling the output of the negative terminal BUCK path and keeping the exceeding difference value gradually reduced.
When the BMS system in this embodiment detects that the discharge current is greater than the overcurrent threshold, it starts to intelligently and dynamically reduce the turn-on duty cycle in the PWM control signal for turning on and off the second discharge MOS transistor, so that the output current output to the electric device starts to be gradually reduced through the negative terminal BUCK path, wherein when the discharge current of the lithium battery of the electric device slowly increases during the operation of the electric device so as to gradually exceed the corresponding overcurrent threshold, it can make the duty cycle within a large value range (e.g., gradually decrease from 100% to 80% or 90%) when reducing the turn-on duty cycle, so that each parameter information is restored to the corresponding set threshold range through slight limit output. When the discharge current of the electric equipment rapidly changes suddenly to exceed the corresponding threshold range and exceeds a large amount, the duty ratio can be directly in a small numerical range (such as rapidly reducing from 100% to 30% or 40%) when the conduction duty ratio is reduced, so that each parameter information is rapidly recovered to the corresponding set threshold range through strong limiting output.
When the conduction duty ratio of the lithium battery pack is reduced, when the difference value between the discharge current and the corresponding set threshold range (namely, the preset discharge current) is smaller and smaller, the conduction duty ratio can be dynamically increased to ensure the power output by the electric equipment, and when the difference value between each numerical value of the parameter information and the corresponding set threshold range is larger and larger, the conduction duty ratio of the lithium battery pack needs to be continuously reduced.
And step S41, when the current output voltage is detected to be reduced to the lowest operation voltage, controlling the negative terminal BUCK path to stop reducing the current discharging current, so that the output voltage of the lithium battery is not lower than the lowest operation voltage when the lithium battery works, and the lithium battery works normally.
In step S51, when the current discharging current controlled by the negative-side BUCK path is detected to be decreased to the preset discharging current and the detected current output voltage is still greater than the lowest operating voltage, the negative-side BUCK path is controlled to stop decreasing the current discharging current, so that the negative-side BUCK path limits the current discharging current to the preset discharging current.
Step S61, after the negative terminal BUCK access communicated between the negative pole of the battery and the negative pole of the port is communicated for a first preset time, switching the on-off of the main access and the negative terminal BUCK access so as to communicate the main access between the negative pole of the battery and the negative pole of the port and disconnect the negative terminal BUCK access between the negative pole of the battery and the negative pole of the port;
wherein, the current can be limited by the negative terminal BUCK path, but the cost of the prior BUCK circuit is high, and the BUCK circuit generates serious heating problem when working for a long time, meanwhile, the power output is limited when the current is always limited, so after the negative terminal BUCK is communicated for a first preset time (such as 120S), it switches to the main path connecting the negative pole of the battery and the negative pole of the port, and cuts off the negative terminal BUCK path between the negative pole of the battery and the negative pole of the port, at this moment, the corresponding step S11 is executed, namely, the discharging current and the output voltage of the lithium battery work are detected, and whether the current discharging current is larger than the overcurrent threshold value or not is judged, if the current discharging current is not larger than the overcurrent threshold value, and then, the negative terminal BUCK passage limits the current output, so that the lithium battery pack is recovered to normally work, and the BMS system realizes the normal output and power supply of the lithium battery pack to the electric equipment through the communication of the main passage according to a normal working mode. If the current discharging current is still larger than the over-current threshold, the above steps S21 to S51 are continued to limit the discharging current again through the negative side BUCK path.
Step S71, when the continuous times of switching the main path and the negative terminal BUCK path are detected to be larger than the first preset times within the second preset time and the current discharge current is judged to be still larger than the overcurrent threshold, the main path and the negative terminal BUCK path between the negative pole of the battery and the negative pole of the port are disconnected;
wherein, when the steps are continuously executed for a plurality of times, namely the discharging current is firstly limited by the negative terminal BUCK passage, then the connection to the main passage is switched after the first preset time is limited, and at the moment, the discharging current is larger than the overcurrent threshold when the connection of the main passage is detected, and at the moment, the discharging current is correspondingly switched to the negative terminal BUCK to limit the discharging current, the steps are sequentially executed, when the continuous times of switching the connection and disconnection of the main passage and the negative terminal BUCK passage are detected to be larger than the first preset times in the second preset time and the current discharging current is judged to be still larger than the overcurrent threshold, the main passage and the negative terminal BUCK passage between the negative electrode of the battery and the negative electrode of the port are disconnected, namely after the current is limited by the negative terminal BUCK passage for the first preset times continuously, the discharging current is switched to be connected to the main passage or larger than the overcurrent threshold after the connection of the main passage is switched, at the moment, the main passage and the negative terminal BUCK passage are disconnected, the current output of the lithium battery pack is stopped, so that the damage caused by overlong working time of the BUCK circuit is avoided, and the damage to the electric equipment caused by overcurrent output of the lithium battery pack is also avoided.
EXAMPLE III
Referring to fig. 3, a schematic structural diagram of a lithium battery operation control system according to a third embodiment of the present invention is shown, for convenience of description, only a part related to the embodiment of the present invention is shown, the lithium battery operation control system is applied to an electric device, and the system includes:
the current detection and judgment module 10 is used for detecting the discharge current and the output voltage of the lithium battery in the working process of the electric equipment in real time and judging whether the current discharge current is greater than an overcurrent threshold value or not;
the first path switching module 20 is configured to disconnect a main path between the negative electrode of the battery and the negative electrode of the port and connect a negative-terminal BUCK path between the negative electrode of the battery and the negative electrode of the port when the current detection and determination module 10 determines that the current discharge current is greater than the overcurrent threshold, so that the negative-terminal BUCK path limits the output magnitude of the discharge current;
the current limiting control module 30 is configured to control the negative terminal BUCK path to gradually reduce the current discharging current, and detect and determine whether the current output voltage is reduced to the lowest operating voltage in the synchronous reduction process;
the first stop control module 40 is used for controlling the negative terminal BUCK path to stop reducing the current discharging current when detecting that the current output voltage is reduced to the lowest operation voltage;
the second stop control module 50 is configured to, when it is detected that the current discharging current controlled by the negative-side BUCK path is reduced to the preset discharging current and the detected current output voltage is still greater than the minimum operating voltage, control the negative-side BUCK path to stop reducing the current discharging current, so that the negative-side BUCK path limits the current discharging current to the preset discharging current.
The implementation principle and the generated technical effects of the lithium battery working control system provided by the embodiment of the invention are the same as those of the method embodiment, and for brief description, no part of the device embodiment is mentioned, and reference may be made to the corresponding contents in the method embodiment.
Example four
Please refer to fig. 4, which is a schematic block diagram of a lithium battery operation control system according to a fourth embodiment of the present invention, and for convenience of description, only the relevant portions of the embodiment of the present invention are shown, and the fourth embodiment has a structure substantially the same as that of the third embodiment, except that in this embodiment, the system further includes:
the second path switching module 60 is configured to switch the main path and the negative terminal BUCK path to be on and off after the first path switching module 20 operates for a first preset time, so as to connect the main path between the negative electrode of the battery and the negative electrode of the port and disconnect the negative terminal BUCK path between the negative electrode of the battery and the negative electrode of the port;
and a path disconnection module 70, configured to disconnect the main path and the negative terminal BUCK path between the negative electrode of the battery and the negative electrode of the port when the number of continuous times of switching the main path and the negative terminal BUCK path is greater than the first preset number of times and it is determined that the current discharge current is still greater than the overcurrent threshold value within the second preset time.
Further, in an embodiment of the present invention, the current limiting control module 30 includes:
and the duty ratio adjusting unit 31 is configured to dynamically and gradually adjust a duty ratio for controlling the negative terminal BUCK path to output according to a difference value that the current discharging current exceeds the overcurrent threshold, so as to gradually reduce the current discharging current.
Further, the duty ratio adjusting unit 31 is configured to:
dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path, and detecting whether the difference value of the current discharge current exceeding the overcurrent threshold value is increased;
if yes, continuously and dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path;
if not, the duty ratio for controlling the output of the negative terminal BUCK path is dynamically increased, and the exceeding difference is kept to be gradually reduced.
The implementation principle and the generated technical effects of the lithium battery working control system provided by the embodiment of the invention are the same as those of the method embodiment, and for brief description, no part of the device embodiment is mentioned, and reference may be made to the corresponding contents in the method embodiment.
The embodiment of the invention also provides a readable storage medium, which stores a program, and the program realizes the steps of the lithium battery working control method according to the embodiment when being executed by a processor. The readable storage medium, such as: ROM/RAM, magnetic disk, optical disk, etc.
The embodiment of the invention also provides electric equipment, which comprises a processor, a memory and a computer program which is stored on the memory and can be run on the processor, wherein when the processor runs the computer program, the electric equipment executes the lithium battery work control method in the embodiment.
According to the electric equipment provided by the embodiment of the invention, when the normal output current of the lithium battery is detected to work, the main channel is controlled to be communicated with the battery cathode of the lithium battery and the port cathode of the lithium battery to realize normal work; when detecting that the output discharge current of the lithium battery is larger than the overcurrent threshold value, controlling a negative terminal BUCK passage to be communicated with the battery negative electrode and the port negative electrode of the lithium battery, so that, in the process of limiting the current through the negative side BUCK path and controlling the current limiting of the negative side BUCK path, the output voltage is correspondingly detected to ensure that the output voltage is not reduced to be lower than the lowest operation voltage in the process of reducing the output voltage to realize the current output of the lithium battery pack, at the moment, the current loop can realize the adjustment of the discharge current to a set range through the double-loop control of the voltage loop and the current loop, and the voltage ring avoids the output voltage of the lithium battery pack to be lower than the minimum operating voltage, so that the output regulation of the discharge current of the lithium battery pack is carried out under the condition that the lithium battery pack can work, and the problem that the existing lithium battery management system controls the direct power-off of the lithium battery when the current lithium battery is over-current and is dangerous is solved.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is used as an example, in practical applications, the above-mentioned function distribution may be performed by different functional units or modules according to needs, that is, the internal structure of the storage device is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit, and the integrated unit may be implemented in a form of hardware, or may be implemented in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application.
Those skilled in the art will appreciate that the constituent structures shown in fig. 3 and 4 do not constitute a limitation of the lithium battery operation control system of the present invention, and may include more or less components than those shown, or some components in combination, or different component arrangements, and that the lithium battery operation control method in fig. 1-2 is implemented by using more or less components than those shown in fig. 3 or 4, or some components in combination, or different component arrangements. The unit, module, etc. referred to in the present invention refers to a series of computer programs that can be executed by a processor (not shown) in the lithium battery operation control system and that can perform specific functions, and all of them can be stored in a storage device (not shown) of the lithium battery operation control system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (11)

1. A lithium battery work control method is applied to electric equipment and is characterized by comprising the following steps:
detecting the discharge current and the output voltage of the lithium battery in the working process of the electric equipment in real time, and judging whether the current discharge current is greater than an overcurrent threshold value or not;
if so, disconnecting the main passage between the battery cathode and the port cathode and communicating a negative terminal BUCK passage between the battery cathode and the port cathode;
controlling a negative terminal BUCK passage to gradually reduce the current discharging current, and detecting and judging whether the current output voltage is reduced to the lowest operation voltage in the synchronous reduction process;
when the current output voltage is detected to be reduced to the lowest operation voltage, controlling a negative terminal BUCK passage to stop reducing the current discharge current so as to enable the output voltage of the lithium battery to be not lower than the lowest operation voltage when the lithium battery works and carry out normal work;
when the current discharging current controlled by the negative terminal BUCK path is detected to be reduced to the preset discharging current, and the detected current output voltage is still larger than the lowest operation voltage, the negative terminal BUCK path is controlled to stop reducing the current discharging current, so that the negative terminal BUCK path limits the current discharging current to the preset discharging current.
2. The lithium battery operation control method as claimed in claim 1, wherein the step of controlling the negative terminal BUCK path to gradually decrease the present discharge current comprises:
and dynamically and gradually adjusting the duty ratio for controlling the output of the negative terminal BUCK passage according to the difference value of the current discharging current exceeding the overcurrent threshold value so as to gradually reduce the current discharging current.
3. The lithium battery operation control method as claimed in claim 2, wherein the step of dynamically gradually adjusting the duty ratio for controlling the output of the negative side BUCK path according to the difference between the current discharge current exceeding the over-current threshold comprises:
dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path, and detecting whether the difference value of the current discharge current exceeding the overcurrent threshold value is increased;
if yes, continuously and dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path;
if not, the duty ratio for controlling the output of the negative terminal BUCK path is dynamically increased, and the exceeding difference is kept to be gradually reduced.
4. The method of controlling operation of a lithium battery as claimed in claim 1, wherein the method further comprises:
after the negative terminal BUCK access communicated between the negative electrode of the battery and the negative electrode of the port is communicated for a first preset time, switching the on-off of the main access and the negative terminal BUCK access so as to communicate the main access between the negative electrode of the battery and the negative electrode of the port and disconnect the negative terminal BUCK access between the negative electrode of the battery and the negative electrode of the port.
5. The method of controlling operation of a lithium battery as claimed in claim 4, wherein the method further comprises:
and when the continuous times of switching the on and off of the main channel and the negative terminal BUCK channel are detected to be greater than the first preset times within the second preset time and the current discharge current is judged to be still greater than the overcurrent threshold, disconnecting the main channel and the negative terminal BUCK channel between the negative electrode of the battery and the negative electrode of the port.
6. A lithium battery work control system is applied to electric equipment, and is characterized in that the system comprises:
the current detection and judgment module is used for detecting the discharge current and the output voltage of the lithium battery in the working process of the electric equipment in real time and judging whether the current discharge current is greater than an overcurrent threshold value or not;
the first path switching module is used for disconnecting the main path between the cathode of the battery and the cathode of the port and communicating a negative terminal BUCK path between the cathode of the battery and the cathode of the port when the current detection judging module judges that the current discharging current is larger than the overcurrent threshold;
the current limiting control module is used for controlling the negative terminal BUCK passage to gradually reduce the current discharging current and detecting and judging whether the current output voltage is reduced to the lowest operation voltage in the synchronous reduction process;
the first stop control module is used for controlling the negative terminal BUCK passage to stop reducing the current discharging current when detecting that the current output voltage is reduced to the lowest operation voltage, so that the output voltage of the lithium battery is not lower than the lowest operation voltage when the lithium battery works to carry out normal work;
and the second stop control module is used for controlling the negative terminal BUCK passage to stop reducing the current discharging current when the current discharging current controlled by the negative terminal BUCK passage is detected to be reduced to the preset discharging current and the detected current output voltage is still larger than the lowest operation voltage, so that the negative terminal BUCK passage limits the current discharging current to the preset discharging current.
7. The lithium battery operation control system of claim 6, wherein the current limiting control module comprises:
and the duty ratio adjusting unit is used for dynamically and gradually adjusting the duty ratio for controlling the output of the negative terminal BUCK passage according to the difference value of the current discharging current exceeding the overcurrent threshold value so as to gradually reduce the current discharging current.
8. The lithium battery operation control system of claim 7, wherein the duty cycle adjustment unit is configured to:
dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path, and detecting whether the difference value of the current discharge current exceeding the overcurrent threshold value is increased;
if yes, continuously and dynamically reducing the duty ratio for controlling the output of the negative terminal BUCK path;
if not, the duty ratio for controlling the output of the negative terminal BUCK path is dynamically increased, and the exceeding difference is kept to be gradually reduced.
9. The lithium battery operation control system of claim 6, wherein the system further comprises:
and the second channel switching module is used for switching the connection and disconnection of the main channel and the negative terminal BUCK channel after the first channel switching module works for a first preset time so as to connect the main channel between the negative pole of the battery and the negative pole of the port and disconnect the negative terminal BUCK channel between the negative pole of the battery and the negative pole of the port.
10. The lithium battery operation control system of claim 9, wherein the system further comprises:
and the path disconnecting module is used for disconnecting the main path and the negative terminal BUCK path between the negative pole of the battery and the negative pole of the port when the continuous times of switching the main path and the negative terminal BUCK path are detected to be greater than the first preset times within the second preset time and the current discharging current is judged to be still greater than the overcurrent threshold.
11. An electrically powered device comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, wherein the electrically powered device executes the lithium battery operation control method according to any one of claims 1 to 5 when the computer program is executed by the processor.
CN202110694472.1A 2021-06-22 2021-06-22 Lithium battery work control method and system and electric equipment Pending CN113472035A (en)

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