CN111009948A - Lithium battery protection board capable of actively adjusting charging and discharging current and current adjusting mode thereof - Google Patents
Lithium battery protection board capable of actively adjusting charging and discharging current and current adjusting mode thereof Download PDFInfo
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- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- 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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Abstract
The invention discloses a lithium battery protection board capable of actively adjusting charging and discharging currents and a current adjusting mode thereof, and relates to the technical field of lithium battery charging and discharging protection. The lithium battery protection board capable of actively adjusting the charging and discharging current comprises a plurality of temperature sampling modules, an AD converter, a master control MCU, a master control IC, a voltage sampling module and a current sampling module, wherein the temperature sampling modules are configured on a detection lithium battery core, a lead, temperature data of a connection pole piece and a protection board radiating fin, the temperature sampling modules are connected with the master control MCU, and the master control MCU acquires temperature values of the temperature sampling modules through the AD converter. Through detecting data such as temperature, voltage, capacity, the integrated algorithm initiative adjustment intervenes the electric current size in the charge-discharge circuit, ensures under extreme condition that lithium cell group can carry out safe charge-discharge operation, can let lithium cell group can compatible most conventional chargers simultaneously, requires to reduce the charger, increases the suitability of lithium cell group.
Description
Technical Field
The invention relates to the technical field of lithium battery charging and discharging protection, in particular to a lithium battery protection board capable of actively adjusting charging and discharging current and a current adjusting mode thereof.
Background
Under the current severe environmental protection problem, green clean energy is more and more emphasized. With the continuous maturity of lithium battery production technology, the lithium battery gradually cancels the lead-acid battery to become mainstream energy storage equipment with the advantages of environmental protection, portability, long cycle life and the like. Along with the continuous wide range of lithium cell application, various rugged working environment make the safety problem of lithium cell obvious, how to guarantee the safety of lithium cell in the use becomes one and its important problem.
Lithium batteries exhibit great variability at different temperatures due to the nature of their own chemical materials. Under the high and low temperature conditions, because the activity of chemical materials in the lithium battery changes, if the lithium battery is continuously charged and discharged by the same current as that under the normal condition, lithium ions nested on the negative electrode in the lithium battery can generate ion crystallization under the low temperature condition, and then the lithium ions pierce through an electrode diaphragm to cause safety accidents such as short circuit, fire, even explosion and the like; the continuous charging and discharging of heavy current under the high temperature condition can lead to the battery core temperature to continue to rise, can lead to the battery core because the incident is caused to excess temperature.
The conventional protective plate can only close a charge-discharge loop after triggering a set temperature after detecting the temperature of the battery cell through a thermistor, and forbids the charge and discharge of a battery, so that the battery cell is protected. The result that causes like this can restrict the service environment of lithium cell greatly, makes the utilization ratio step-down of lithium cell. Even the equipment with the lithium battery can not be used all the year round, thus causing resource waste.
Meanwhile, if a conventional charger is used for charging or heavy-load continuous discharge, an abnormal fault of a battery cell in the battery pack can be caused, and further damage and safety accidents occur.
Disclosure of Invention
In order to ensure that the lithium battery pack can carry out safe and continuous charging and discharging operation under extreme conditions, the technical scheme of the invention provides a current adjusting mode of the lithium battery protection plate capable of actively adjusting charging and discharging current. The technical scheme is as follows:
in a first aspect, a lithium battery protection board capable of actively adjusting charging and discharging current comprises a plurality of temperature sampling modules, an AD converter, a main control MCU, a main control IC, a voltage sampling module and a current sampling module,
the temperature sampling module is configured to detect the temperature data of the lithium cell, the lead, the connecting pole piece and the heat radiating fin of the protective plate, the temperature sampling module is connected with the main control MCU, the main control MCU acquires the temperature value of the temperature sampling module through the AD converter,
the voltage sampling module is configured to detect the voltage value of each level of battery cell, the current sampling module is configured to detect the current value of the battery pack loop, the voltage sampling module and the current sampling module are connected with the master control IC, the master control IC is connected with the master control MCU,
but lithium battery protection shield of initiative adjustment charge-discharge current still includes discharge MOS drive circuit, the MOS drive circuit that charges, discharge MOS group and the MOS group that charges, and the MOS drive circuit that discharges is connected with master control MCU, and the MOS drive circuit that charges is connected with master control MCU, and the MOS drive circuit that discharges is connected with the MOS group that discharges, and the MOS drive circuit that charges is connected with the MOS group that charges, and current sampling module and the MOS group that discharges are connected with the MOS group that charges.
Specifically, a plurality of Gata poles of the charging MOS of the lithium battery pack are connected in parallel with the output end of the charging MOS drive circuit through independent drive resistors, and the control end of the charging MOS drive circuit is connected with the main control MCU.
Specifically, Gata electrodes of a plurality of discharge MOS of the lithium battery pack are connected in parallel with the output end of the discharge MOS drive circuit through a single drive resistor, and the control end of the discharge MOS drive circuit; and connecting the master control MCU.
Specifically, the main control MCU is connected with the main control IC in an IIC communication mode.
In a second aspect, the current adjustment modes include a charging current adjustment mode and a discharging current adjustment mode.
Specifically, the charging current adjusting method comprises the following steps: s1: the voltage sampling module detects voltage data of each level of single battery cell and sends the voltage data to the master control IC; s2: the main control MCU acquires voltage data of each level of single battery cell from the main control IC in an IIC communication mode, screens and judges the lowest battery cell voltage and the highest battery cell voltage, and obtains the maximum voltage difference data of the battery cells in the battery pack; s3: calculating the residual capacity through static voltage data comparison; s4: the temperature sampling module acquires temperature data of each lithium battery cell, the lead, the connecting pole piece and the radiating fin of the protection plate, and the AD converter converts the temperature data into a digital signal; s5: the master control MCU acquires temperature data, screens out a highest temperature point and a lowest temperature point, and determines a high-temperature or low-temperature coefficient according to the highest temperature and the lowest temperature; s6: the duty ratio of PWM output by the main control MCU is determined by utilizing a PID algorithm by integrating a temperature value, a voltage value, residual capacity and a temperature coefficient; s7: when the battery temperature is lower, PWM output duty cycle is lower for the charging current of group battery is lower, and because charging constantly rises when the battery temperature, electric core chemical material activity one-tenth degree constantly improves, and MCU output PWM's duty cycle constantly increases, opens till completely, acquires the maximum charging current.
Specifically, the discharge current adjustment method comprises the following steps: s1: the output duty ratio of PWM of a charging control part of the main control MCU is set to be 0, and the charging MOS group is closed; s2: the voltage sampling module detects voltage data of each level of single battery cell and sends the voltage data to the master control IC; s3: the main control MCU acquires voltage data of each level of single battery cell from the main control IC in an IIC communication mode, screens and judges the lowest battery cell voltage and the highest battery cell voltage, and obtains the maximum voltage difference data of the battery cells in the battery pack; s4: calculating the residual capacity through static voltage data comparison; s5: the temperature sampling module acquires temperature data of each lithium battery cell, the lead, the connecting pole piece and the radiating fin of the protection plate, and the AD converter converts the temperature data into a digital signal; s6: the master control MCU acquires temperature data, screens out a highest temperature point and a lowest temperature point, and determines a high-temperature or low-temperature coefficient according to the highest temperature and the lowest temperature; s7: the duty ratio of PWM output by the main control MCU is determined by utilizing a PID algorithm by integrating a temperature value, a voltage value, residual capacity and a temperature coefficient; s8: when the temperature of the battery is high, the main control MCU reduces the duty ratio output by the discharge control PWM, so that the discharge current of the battery pack is limited, the total output load power of the battery pack is controlled, until the discharge protection voltage value of the battery cell is triggered, the PWM output duty ratio is 0, the discharge MOS set is closed, and the discharge is stopped.
Through detecting data such as temperature, voltage, capacity, the integrated algorithm initiative adjustment intervenes the electric current size in the charge-discharge circuit, ensures under extreme condition that lithium cell group can carry out safe charge-discharge operation, can let lithium cell group can compatible most conventional chargers simultaneously, requires to reduce the charger, increases the suitability of lithium cell group.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention, in which:
fig. 1 is a schematic view of a connection structure of a lithium battery protection board capable of actively adjusting charging and discharging current according to an embodiment of the present invention.
Reference numerals: 1 temperature sampling module, 2 voltage sampling module, 3 current sampling module, 4 main control MCU, 5 main control IC, 6 discharge MOS drive circuit, 7 charge MOS drive circuit, 8 discharge MOS group, 9 charge MOS group
Detailed Description
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Under the current severe environmental protection problem, green clean energy is more and more emphasized. With the continuous maturity of lithium battery production technology, the lithium battery gradually cancels the lead-acid battery to become mainstream energy storage equipment with the advantages of environmental protection, portability, long cycle life and the like. Along with the continuous wide range of lithium cell application, various rugged working environment make the safety problem of lithium cell obvious, how to guarantee the safety of lithium cell in the use becomes one and its important problem.
Lithium batteries exhibit great variability at different temperatures due to the nature of their own chemical materials. Under the high and low temperature conditions, because the activity of chemical materials in the lithium battery changes, if the lithium battery is continuously charged and discharged by the same current as that under the normal condition, lithium ions nested on the negative electrode in the lithium battery can generate ion crystallization under the low temperature condition, and then the lithium ions pierce through an electrode diaphragm to cause safety accidents such as short circuit, fire, even explosion and the like; the continuous charging and discharging of heavy current under the high temperature condition can lead to the battery core temperature to continue to rise, can lead to the battery core because the incident is caused to excess temperature.
The conventional protective plate can only close a charge-discharge loop after triggering a set temperature after detecting the temperature of the battery cell through a thermistor, and forbids the charge and discharge of a battery, so that the battery cell is protected. The result that causes like this can restrict the service environment of lithium cell greatly, makes the utilization ratio step-down of lithium cell. Even the equipment with the lithium battery can not be used all the year round, thus causing resource waste.
Meanwhile, if a conventional charger is used for charging or heavy-load continuous discharge, an abnormal fault of a battery cell in the battery pack can be caused, and further damage and safety accidents occur.
In order to ensure that the lithium battery pack can carry out safe and continuous charging and discharging operation under extreme conditions, the technical scheme of the invention provides a current adjusting mode of a lithium battery protection plate capable of actively adjusting charging and discharging current, and the technical scheme is as follows:
the invention is explained in further detail below with reference to fig. 1.
On the first hand, the lithium battery protection board capable of actively adjusting charging and discharging current comprises a plurality of temperature sampling modules 1, an AD converter, a main control MCU (4), a main control IC (5), a voltage sampling module 2 and a current sampling module 3,
the temperature sampling module 1 is configured to detect the temperature data of the lithium cell, the lead, the connecting pole piece and the heat radiating fin of the protective plate, the temperature sampling module 1 is connected with the main control MCU (4), the main control MCU (4) obtains the temperature value of the temperature sampling module 1 through the AD converter,
the voltage sampling module 2 is configured to detect the voltage value of each level of battery cell, the current sampling module 3 is configured to detect the current value of the battery pack loop, the voltage sampling module 2 and the current sampling module 3 are connected with a master control IC (5), the master control IC (5) is connected with a master control MCU (4),
but lithium battery protection shield of initiative adjustment charge-discharge current still includes discharge MOS drive circuit 6, charge MOS drive circuit 7, discharge MOS group 8 and charge MOS group 9, discharge MOS drive circuit 6 is connected with master control MCU (4), charge MOS drive circuit 7 is connected with master control MCU (4), discharge MOS drive circuit 6 is connected with discharge MOS group 8, charge MOS drive circuit 7 is connected with charge MOS group 9, current sampling module 3 is organized 8 with discharge MOS and is connected with charge MOS group 9.
Specifically, Gata electrodes of a plurality of charging MOS of the lithium battery pack are connected in parallel with an output end of the charging MOS drive circuit 7 through an individual drive resistor, and a control end of the charging MOS drive circuit 7 is connected with the main control MCU (4).
Specifically, Gata electrodes of a plurality of discharge MOSs of the lithium battery pack are connected in parallel with the output end of the discharge MOS drive circuit 6 through a single drive resistor, and the control end of the discharge MOS drive circuit 6; and the master control MCU (4) is connected.
Specifically, the main control MCU (4) is connected with the main control IC (5) in an IIC communication mode.
In the attached drawing, T1, T2 are to say that.
B0 and B2. the. Bn are respectively connected with corresponding pins of a protection IC U1, and the protection IC is responsible for acquiring cell voltage values of all levels and a current value of a battery pack loop and transmitting the cell voltage values and the current value to a main control MCU (4) in an IIC communication mode. In actual operation, a voltage change of 0.01V can be judged by adopting a high-precision voltage detection device, and a current change value of 0.1A can be provided by current sampling detection.
Gata poles of the charging MOS groups 9 are connected in parallel with the output end of the charging MOS drive circuit 7 through independent drive resistors, and the control end of the charging MOS group 9 drive circuit is connected with the output pin of the independent PWM control module 1 of the main control MCU (4);
gata poles of the discharging MOS groups 8 are connected in parallel with the output end of the discharging MOS drive circuit 6 through independent drive resistors, and the control end of the discharging MOS drive circuit 6 is connected to the output pin of the independent PWM control module 2 of the main control MCU (4).
In a second aspect, the current adjustment modes include a charging current adjustment mode and a discharging current adjustment mode.
Specifically, the charging current adjusting method comprises the following steps: s1: the voltage sampling module 2 detects voltage data of each level of single battery cell and sends the voltage data to the main control IC (5); s2: the main control MCU (4) acquires voltage data of each level of single battery cell from the main control IC (5) in an IIC communication mode, screens and judges the lowest battery cell voltage and the highest battery cell voltage, and obtains the maximum voltage difference data of the battery cells in the battery pack; s3: calculating the residual capacity through static voltage data comparison; s4: the temperature sampling module 1 acquires temperature data of each lithium battery cell, a lead, a connecting pole piece and a protective plate radiating fin, and the AD converter converts the temperature data into a digital signal; s5: the master control MCU (4) acquires temperature data, screens out a highest temperature point and a lowest temperature point, and determines a high-temperature or low-temperature coefficient according to the highest temperature and the lowest temperature; s6: the duty ratio of PWM output by the main control MCU (4) is determined by integrating the temperature value, the voltage value, the residual capacity and the temperature coefficient by utilizing a PID algorithm; s7: when the battery temperature is lower, PWM output duty cycle is lower for the charging current of group battery is lower, and because charging constantly rises when the battery temperature, electric core chemical material activity one-tenth degree constantly improves, and MCU output PWM's duty cycle constantly increases, opens till completely, acquires the maximum charging current.
Specifically, the discharge current adjustment method comprises the following steps: s1: the output duty ratio of PWM of a charging control part of the main control MCU (4) is set to be 0, and the charging MOS group 9 is closed; s2: the voltage sampling module 2 detects voltage data of each level of single battery cell and sends the voltage data to the main control IC (5); s3: the main control MCU (4) acquires voltage data of each level of single battery cell from the main control IC (5) in an IIC communication mode, screens and judges the lowest battery cell voltage and the highest battery cell voltage, and obtains the maximum voltage difference data of the battery cells in the battery pack; s4: calculating the residual capacity through static voltage data comparison; s5: the temperature sampling module 1 acquires temperature data of each lithium battery cell, a lead, a connecting pole piece and a protective plate radiating fin, and the AD converter converts the temperature data into a digital signal; s6: the master control MCU (4) acquires temperature data, screens out a highest temperature point and a lowest temperature point, and determines a high-temperature or low-temperature coefficient according to the highest temperature and the lowest temperature; s7: the duty ratio of PWM output by the main control MCU (4) is determined by integrating the temperature value, the voltage value, the residual capacity and the temperature coefficient by utilizing a PID algorithm; s8: when the temperature of the battery is high, the main control MCU (4) reduces the duty ratio of the discharge control PWM output, further limits the discharge current of the battery pack, controls the total output load power of the battery pack, and closes the discharge MOS group 8 and stops discharging until the discharge protection voltage value of the battery cell is triggered, and the PWM output duty ratio is 0.
Through detecting data such as temperature, voltage, capacity, the integrated algorithm initiative adjustment intervenes the electric current size in the charge-discharge circuit, ensures under extreme condition that lithium cell group can carry out safe charge-discharge operation, can let lithium cell group can compatible most conventional chargers simultaneously, requires to reduce the charger, increases the suitability of lithium cell group.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims of the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "one end" and "the other end" merely indicate relative positional relationships, and when the absolute positional relationship of the object to be described is changed, the corresponding positional relationship is also changed accordingly. Also herein, the singular forms "a", "an" and "the" include plural forms.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (7)
1. The lithium battery protection board capable of actively adjusting charging and discharging current is characterized by comprising a plurality of temperature sampling modules, an AD converter, a main control MCU, a main control IC, a voltage sampling module and a current sampling module,
the temperature sampling module is configured to detect temperature data of the lithium cell, the lead, the connecting pole piece and the heat radiating fin of the protective plate, the temperature sampling module is connected with the main control MCU, the main control MCU acquires a temperature value of the temperature sampling module through an AD converter,
the voltage sampling module is configured to detect the voltage value of each level of battery cell, the current sampling module is configured to detect the current value of the battery pack loop, the voltage sampling module and the current sampling module are connected with the master control IC, the master control IC is connected with the master control MCU,
but lithium battery protection board of active adjustment charge-discharge current still includes discharge MOS drive circuit, the MOS drive circuit that charges, discharge MOS group and the MOS group that charges, discharge MOS drive circuit with master control MCU connects, charge MOS drive circuit with master control MCU connects, discharge MOS drive circuit with discharge MOS group connects, charge MOS drive circuit with charge MOS group connects, the current sampling module with discharge MOS group and charge MOS group connect.
2. The lithium battery protection board capable of actively adjusting charging and discharging current according to claim 1, wherein Gata poles of a plurality of charging MOS of the lithium battery pack are connected in parallel with an output end of the charging MOS driving circuit through a separate driving resistor, and a control end of the charging MOS driving circuit is connected to the main control MCU.
3. The lithium battery protection board capable of actively adjusting charging and discharging current according to claim 1, wherein Gata poles of a plurality of discharging MOS of the lithium battery pack are connected in parallel with an output end of the discharging MOS driving circuit through a single driving resistor, and a control end of the discharging MOS driving circuit; and connecting the master control MCU.
4. The lithium battery protection board capable of actively adjusting charging and discharging current as claimed in claim 1, wherein the main control MCU is connected to the main control IC through IIC communication.
5. A current regulation mode, characterized in that, depending on the lithium battery protection board capable of actively regulating charge and discharge current as claimed in claims 1 to 3, the current regulation mode includes a charge current regulation mode and a discharge current regulation mode.
6. The current regulation mode of claim 5, wherein the charging current regulation mode comprises the following steps:
s1: the voltage sampling module detects voltage data of each level of single battery cell and sends the voltage data to the main control IC;
s2: the main control MCU acquires the voltage data of each level of monomer battery cell from the main control IC in the IIC communication mode, screens and judges the lowest battery cell voltage and the highest battery cell voltage, and obtains the maximum voltage difference data of the battery cells in the battery pack;
s3: calculating the residual capacity through static voltage data comparison;
s4: the temperature sampling module acquires temperature data of each lithium battery cell, a lead, a connecting pole piece and a protective plate radiating fin, and the AD converter converts the temperature data into a digital signal;
s5: the master control MCU acquires temperature data, screens out a highest temperature point and a lowest temperature point, and determines a high-temperature or low-temperature coefficient according to the highest temperature and the lowest temperature;
s6: integrating the temperature value, the voltage value, the residual capacity and the temperature coefficient, and determining the duty ratio of PWM output by the main control MCU by utilizing a PID algorithm;
s7: when the battery temperature is lower, PWM output duty cycle is lower for the charging current of group battery is lower, and because charging constantly rises when the battery temperature, electric core chemical material activity one-tenth degree constantly improves, and MCU output PWM's duty cycle constantly increases, opens till completely, acquires the maximum charging current.
7. The current regulation mode of claim 5, wherein the discharge current regulation mode comprises the steps of:
s1: the output duty ratio of PWM of a charging control part of the main control MCU is set to be 0, and the charging MOS group is closed;
s2: the voltage sampling module detects voltage data of each level of single battery cell and sends the voltage data to the main control IC;
s3: the main control MCU acquires the voltage data of each level of monomer battery cell from the main control IC in the IIC communication mode, screens and judges the lowest battery cell voltage and the highest battery cell voltage, and obtains the maximum voltage difference data of the battery cells in the battery pack;
s4: calculating the residual capacity through static voltage data comparison;
s5: the temperature sampling module acquires temperature data of each lithium battery cell, a lead, a connecting pole piece and a protective plate radiating fin, and the AD converter converts the temperature data into a digital signal;
s6: the master control MCU acquires temperature data, screens out a highest temperature point and a lowest temperature point, and determines a high-temperature or low-temperature coefficient according to the highest temperature and the lowest temperature;
s7: integrating the temperature value, the voltage value, the residual capacity and the temperature coefficient, and determining the duty ratio of PWM output by the main control MCU by utilizing a PID algorithm;
s8: when the temperature of the battery is high, the main control MCU reduces the duty ratio output by the discharge control PWM, so that the discharge current of the battery pack is limited, the total output load power of the battery pack is controlled until the discharge protection voltage value of the battery cell is triggered, the PWM output duty ratio is 0, the discharge MOS set is closed, and the discharge is stopped.
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| CN113162180A (en) * | 2021-04-29 | 2021-07-23 | 深圳拓邦股份有限公司 | Lithium battery work control method and system and electric equipment |
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| CN114388908A (en) * | 2022-01-12 | 2022-04-22 | 深圳市吉美智科技有限公司 | Lithium battery protection board and safety system |
| CN114944517A (en) * | 2022-06-09 | 2022-08-26 | 罗航 | A system to improve the overall discharge efficiency of the battery |
| CN115020845A (en) * | 2021-11-09 | 2022-09-06 | 荣耀终端有限公司 | Cell temperature detection method, device, storage medium, and program product |
| CN115483739A (en) * | 2022-09-29 | 2022-12-16 | 深圳市毅光信电子有限公司 | Charging method and device for digital product, digital product and storage medium |
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| CN114944517A (en) * | 2022-06-09 | 2022-08-26 | 罗航 | A system to improve the overall discharge efficiency of the battery |
| CN115483739A (en) * | 2022-09-29 | 2022-12-16 | 深圳市毅光信电子有限公司 | Charging method and device for digital product, digital product and storage medium |
| CN116424149A (en) * | 2023-02-17 | 2023-07-14 | 宇通客车股份有限公司 | A charging and swapping system over-temperature protection method and device |
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