CN116093467A - Self-adaptive control method for battery management system of electric tool - Google Patents
Self-adaptive control method for battery management system of electric tool Download PDFInfo
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- CN116093467A CN116093467A CN202310369060.XA CN202310369060A CN116093467A CN 116093467 A CN116093467 A CN 116093467A CN 202310369060 A CN202310369060 A CN 202310369060A CN 116093467 A CN116093467 A CN 116093467A
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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
- H01M10/44—Methods for charging or discharging
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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
- H01M10/4285—Testing apparatus
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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
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/00302—Overcharge protection
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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
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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
- H02J7/00306—Overdischarge protection
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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
- H02J7/00309—Overheat or overtemperature protection
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
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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
- H02J7/007—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
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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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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- General Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a self-adaptive control method of a battery management system of an electric tool, which comprises the following steps: the BMS basic module acquires state information of the target battery in real time and judges the state information to obtain a health coefficient and an aging coefficient; further obtaining the adjusted charge-discharge current parameters; and transmitting the state information of the target battery and the charge-discharge current parameters to a charging facility through a communication module, and carrying out self-adaptive adjustment on the charge-discharge current by the charging facility according to the communicated real-time information and the adjusted charge-discharge parameters. According to the invention, corresponding charging and discharging currents are adjusted according to different real-time working temperatures of the battery pack, so that the battery pack is less prone to achieving over-temperature protection, the charging time is shorter, and the discharging time is longer. The battery pack can be used as a platform by communicating aging and health parameters, real-time voltage and temperature to corresponding chargers and machines, and the battery pack has certain platform universality.
Description
Technical Field
The invention belongs to the field of lithium battery charge and discharge management, and particularly relates to a self-adaptive control method of a battery management system of an electric tool.
Background
At present, a lithium battery is generally adopted in an electric tool, but chemical and physical changes can occur in the use process of the lithium battery, the aging degree and the health state of the lithium battery are shown, and the changes can influence the performance and the service life of the lithium battery. The degree of aging and the state of health of lithium batteries are generally determined by several factors: (1) number of charge and discharge cycles: the more the charge and discharge times of the lithium battery, the higher the aging degree thereof. This is because each charge and discharge results in chemical changes in the electrolyte and electrode materials in the lithium ion battery, thereby reducing the capacity and performance of the lithium battery. (2) temperature: the higher the operating temperature of a lithium battery, the higher the degree of aging of the battery. This is because high temperature accelerates the rate of chemical reactions inside the lithium battery, resulting in a decrease in capacity and performance of the lithium battery. (3) charge and discharge current magnitude: the faster the charge and discharge rate, i.e., the greater the current, the shorter the charge and discharge time, and the higher the degree of aging of the lithium battery. This is because rapid charge and discharge may cause chemical changes in the electrolyte and electrode materials in the lithium ion battery, thereby reducing the capacity and performance of the lithium battery. (4) unbalanced charge and discharge of multiple strings of battery cells: due to the inconsistency of battery characteristics, voltage differences may exist in multiple strings of lithium batteries, so that the voltage difference exists in the battery cells, and frequent overvoltage and undervoltage occur in the charging and discharging processes, so that the aging degree of the batteries is increased.
The lithium battery can generate the following problems after the aging degree is aggravated and the health state is worsened; (1) capacity fade: capacity fade of a lithium battery refers to a decrease in capacity of the lithium battery during charge and discharge. As the aging degree of the lithium battery increases, the capacity thereof decays more rapidly. Capacity fade can result in reduced cruising ability of lithium batteries. (2) increase in internal resistance: the increase in internal resistance of the lithium battery refers to an increase in internal resistance of the lithium battery during charge and discharge. As the aging degree of the lithium battery increases, the internal resistance thereof increases, resulting in a decrease in the output power of the lithium battery. (3) safety degradation: the safety of the lithium battery is reduced, namely the probability of leakage, short circuit, explosion and other safety problems of the lithium battery in the charging and discharging processes is increased. When the aging degree of the lithium battery increases, the safety thereof may be lowered, thereby possibly causing a safety accident.
At present, the lithium battery of an electric tool is fixed in charge-discharge protection parameters in a battery management system, corresponding charge and discharge related parameters cannot be adjusted according to the aging and health degree of the lithium battery in the working process, the charge and discharge current cannot be adjusted in real time according to the real-time temperature of the battery, the aging degree and health state of the lithium battery cannot be reduced, the aging and actual use time of the lithium battery can be influenced, the lithium battery is not durable in the use process, and the service life of the lithium battery is shortened.
Disclosure of Invention
The invention aims to: the invention aims to provide a self-adaptive control method of a battery management system of an electric tool, which aims at different real-time working temperatures of a battery pack, and adjusts corresponding charge and discharge currents, so that the battery pack is less prone to achieving over-temperature protection, and has shorter charge time and longer discharge time.
The technical scheme is as follows: the invention relates to a self-adaptive control method of a battery management system of an electric tool, which comprises the following steps:
step 1: the method comprises the steps of collecting state information of a target battery in real time through a BMS basic module, and accumulating the sum of times of overcharging, overdischarging, over-temperature, overcurrent and self-balancing of the target battery;
step 2: judging the sum of the accumulated times of overcharging, overdischarging, over-temperature, overcurrent and self-balancing of the target battery, and defining the health coefficient and the aging coefficient of the target battery;
step 3: combining the health coefficient and the aging coefficient with an algorithm for adjusting the charge-discharge parameters to obtain adjusted charge-discharge current parameters;
step 4: and transmitting the state information and the charge-discharge current parameters of the target battery to a charging facility through a communication module, and adaptively adjusting the charge-discharge current of the target battery by the charging facility according to the communicated real-time information and the adjusted charge-discharge parameters.
Further, in step 1, the state information of the target battery includes the voltage of each unit cell, the current in the battery loop, the temperature information of each temperature acquisition point inside the battery, and the charge information of the battery pack.
Further, step 2 specifically includes: the slave BMS basic module reads the accumulated times of overcharge, overdischarge, overtemperature, overcurrent and self-balancing and judges, and when the cycle times are not more than 300, the health coefficient alpha=1 is selected; when the number of times is between 300 and 500, selecting a health coefficient alpha=0.95; when the number of times exceeds 500, selecting a health coefficient alpha=0.93; meanwhile, the secondary BMS basic module reads the accumulated times of battery charge and discharge cycles, judges the accumulated times, and selects an aging coefficient beta=1 when the accumulated times are not more than 500; when the cycle number is between 500 and 1000, selecting an aging coefficient beta=0.98; when the number of cycles exceeds 1000, the aging coefficient β=0.95 is selected.
Further, the charging facility includes a charger or a power tool.
Further, when the charger is selected, parameters such as a charge cutoff voltage Vcof the charger, a charge imbalance differential pressure Vcdif, a constant-current charge current Icon, a charge high-temperature cutoff temperature Tcof and the like are calculated and updated, and an alpha value and a beta value are combined for calculation to obtain adjusted charge and discharge current parameters; the calculation method comprises the following steps: v' cof =vcof α β; v' cdif=vcdif α β; i' con=icon α β D, D being the charging current temperature coefficient; t' cof =tcof α β; wherein V 'cof is the adjusted charge cutoff voltage, V' cdif is the adjusted charge imbalance differential pressure, I 'con is the adjusted constant current charge current, and T' cof is the adjusted charge high temperature cutoff temperature. Stopping charging when the single highest battery voltage Vmax of the real-time voltage is more than or equal to V 'cof, otherwise, normally charging, and stopping charging when the unbalanced voltage difference of the real-time charging (single highest battery voltage Vmax-single lowest battery voltage Vmin) is more than or equal to V' cdif, otherwise, normally charging; when the ratio of the real-time temperature to the adjusted high-temperature cutoff temperature is greater than or equal to 0.6, the constant-current charging current needs to be multiplied by the real-time charging current temperature coefficient D, the value of D corresponds to the ratio, and when the real-time temperature is greater than or equal to the high-temperature cutoff temperature T' cof, the charging is stopped.
Further, when the electric tool is selected, the adjusted charge-discharge current parameters are obtained by calculating the discharge cutoff voltage Vdof, the discharge unbalanced pressure difference Vddif, the discharge maximum allowable current Imax, the rated operating current Idret and the discharge high temperature cutoff temperature tdot parameters in combination with the alpha and beta values, and the calculation formula is as follows: v' dof=vdof α β; v' ddif=vdif α β; i' max=imax α β; i' dret=idret×f, F being the discharge current temperature coefficient; t' dof=tdofα β; wherein V ' dof is the adjusted discharge cut-off voltage, V ' ddif is the adjusted discharge unbalanced pressure difference, I ' max is the adjusted discharge maximum allowable current, I ' dret is the adjusted rated working current, and T ' dof is the adjusted discharge high-temperature cut-off temperature. Stopping charging when the voltage Vmin of the single lowest battery of the real-time voltage is less than or equal to V' dof, otherwise, normally charging; stopping discharging when the real-time discharging unbalanced pressure difference (the single highest cell voltage Vmax-the single lowest cell voltage Vmin) is more than or equal to V' ddif, otherwise, normally discharging; when the ratio of the real-time temperature to the adjusted discharge high-temperature cutoff temperature is more than or equal to 0.6, the rated working current Idret needs to be multiplied by the real-time discharge current temperature coefficient F, the value of F corresponds to the ratio, and when the real-time working current of the motor is more than or equal to the discharge maximum allowable current I' max, the discharge is stopped; and stopping discharging when the real-time temperature is greater than or equal to the discharge high-temperature cutoff temperature T' dof.
The invention also discloses a battery management system of the electric tool, which comprises a BMS basic module, an aging and health coefficient calculation module, a communication module, a charging parameter adjustment module and a discharging parameter adjustment module; the BMS basic module is used for collecting voltage, charging and discharging current, charging and discharging temperature, equalization information and battery charge state of the battery pack; the aging and health coefficient calculation module is used for analyzing and calculating information collected by the BMS basic module to obtain aging and health coefficients; the communication module is used for completing the communication of the aging and health coefficients and the real-time temperature and voltage to a charger or an electric tool which correspondingly works; the charging and discharging parameter adjusting module is used for carrying out charging parameter operation according to the communication information of the corresponding charger or electric tool, and carrying out current limiting or stopping charging and discharging protection by combining real-time voltage and temperature.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable advantages:
(1) The battery management system self-adaptive control method comprises a charging and discharging parameter adjusting module for adjusting charging and discharging parameters of a battery pack in real time in life cycles of different stages. (2) Corresponding charging and discharging currents are adjusted according to different real-time working temperatures of the battery pack, so that the battery pack is not easy to achieve over-temperature protection, the charging time is shorter, and the discharging time is longer. (3) The battery pack can be used as a platform by communicating aging and health parameters, real-time voltage and temperature to corresponding chargers and machines, and the battery pack has certain platform universality.
Drawings
Fig. 1 is a schematic view of a basic module of a BMS according to the present invention;
FIG. 2 is a flow chart of an aging and health adjustment module;
FIG. 3 is a block diagram of a work system;
FIG. 4 is a flow chart for adjusting charging parameters;
fig. 5 is a flow chart of discharge parameter adjustment.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
The invention aims to provide a self-adaptive control method of a battery management system of an electric tool, which is used for adjusting an aging coefficient and a health coefficient through a self-capacity algorithm and a battery health management algorithm in the whole life cycle of a battery, communicating the coefficient and real-time temperature and voltage to a charger and the electric tool to adjust charge and discharge parameters and adjust battery protection parameters in real time. Thereby realizing the self-adaptive control of the battery management process.
As shown in fig. 1: the BMS basic module collects state information of the battery in real time, wherein the state information comprises the following components: the voltage of each single cell, the current in a battery loop, the temperature information of each temperature acquisition point inside the battery and the charge information of the battery pack; in the whole service life of the battery, the BMS basic module stores the sum of the accumulated times of overcharge, overdischarge, over-temperature, overcurrent and self-balancing, and stores the accumulated times of charge and discharge cycles of the battery according to the charge information.
As shown in fig. 2: the slave BMS basic module reads the accumulated times of overcharge, overdischarge, overtemperature, overcurrent and self-balancing and judges, and when the cycle times are not more than 300, the health coefficient alpha=1 is selected; when the number of times is between 300 and 500, selecting
Taking a health coefficient b=0.95; when the number of times exceeds 500, selecting a health coefficient b=0.93; meanwhile, the secondary BMS basic module reads the accumulated times of battery charge and discharge cycles, judges the accumulated times, and selects an aging coefficient beta=1 when the accumulated times are not more than 500; when the cycle number is between 500 and 1000, selecting an aging coefficient b=0.98; when the cycle number exceeds 1000, an aging coefficient b=0.95 is selected, and the obtained health coefficient and the aging coefficient are involved in an algorithm for adjusting the charge and discharge parameters. And obtaining the adjusted charge-discharge current parameters.
As shown in fig. 3: the communication module receives the real-time voltage, the temperature and the balance information of the BMS basic module and the calculated aging and health parameters, and communicates the real-time voltage, the temperature and the balance information to a charger or an electric tool in working, and the charger or the electric tool makes corresponding real-time adjustment on the charging and discharging parameters according to the communication real-time information and the adjusted aging and health parameters. And realizing the self-adaptive control of the battery management process by self-adjusting the strategy of the charge and discharge parameters in the whole life cycle of the battery.
And (3) a charging parameter real-time adjustment strategy of the charger:
referring to fig. 4: firstly, calculating and updating parameters such as a charge cut-off voltage Vcof a charger, a charge unbalanced differential pressure Vcdif, a constant-current charge current Icon, a charge high-temperature cut-off temperature Tcof and the like, and calculating by combining alpha and beta values to obtain adjusted charge and discharge current parameters; the calculation method comprises the following steps: v' cof =vcof α β; v' cdif=vcdif α β; i' con=icon α β D, D being the charging current temperature coefficient; t' cof =tcof α β; wherein V 'cof is the adjusted charge cutoff voltage, V' cdif is the adjusted charge imbalance differential pressure, I 'con is the adjusted constant current charge current, and T' cof is the adjusted charge high temperature cutoff temperature. Stopping charging when the single highest battery voltage Vmax of the real-time voltage is more than or equal to V 'cof, otherwise, normally charging, and stopping charging when the unbalanced voltage difference of the real-time charging (single highest battery voltage Vmax-single lowest battery voltage Vmin) is more than or equal to V' cdif, otherwise, normally charging; when the ratio of the real-time temperature to the adjusted high-temperature cutoff temperature of the charging is more than or equal to 0.6, the constant-current charging current needs to be multiplied by the real-time charging current temperature coefficient D, and the value of D corresponds to the ratio, and table 1 can be referred to; and stopping charging when the real-time temperature is greater than or equal to the charging high-temperature cutoff temperature T' cof.
Table 1: real-time charging current temperature coefficient data
The electric tool discharge parameter real-time adjustment strategy comprises the following steps:
referring to fig. 5:
firstly, the adjusted charge-discharge current parameters are obtained by carrying out operation on the discharge cutoff voltage Vdof, the discharge unbalanced pressure difference Vddif, the discharge maximum allowable current Imax, the rated working current Idret and the discharge high-temperature cutoff temperature Tdof parameters in combination with alpha and beta values, and the operation formula is as follows: v' dof=vdof α β; v' ddif=vdif α β; i' max=imax α β; i' dret=idret×f, F being the discharge current temperature coefficient; t' dof=tdofα β; wherein V ' dof is the adjusted discharge cut-off voltage, V ' ddif is the adjusted discharge unbalanced pressure difference, I ' max is the adjusted discharge maximum allowable current, I ' dret is the adjusted rated working current, and T ' dof is the adjusted discharge high-temperature cut-off temperature. Stopping charging when the voltage Vmin of the single lowest battery of the real-time voltage is less than or equal to V' dof, otherwise, normally charging; stopping discharging when the real-time discharging unbalanced pressure difference (the single highest cell voltage Vmax-the single lowest cell voltage Vmin) is more than or equal to V' ddif, otherwise, normally discharging; when the ratio of the real-time temperature to the adjusted discharge high-temperature cutoff temperature is greater than or equal to 0.6, the rated operating current Idret needs to be multiplied by the real-time discharge current temperature coefficient F, and the value of F corresponds to the ratio, and table 2 can be referred to. Stopping discharging when the real-time working current of the motor is greater than or equal to the maximum allowable discharging current I' max; and stopping discharging when the real-time temperature is greater than or equal to the discharge high-temperature cutoff temperature T' dof.
Table 2: real-time discharge current temperature coefficient data
Claims (7)
1. The self-adaptive control method of the battery management system of the electric tool is characterized in that in the process of charging and discharging the target battery, state information of the target battery is collected in real time based on a BMS basic module, and the charging and discharging current of the target battery is adjusted in real time by executing the following steps of;
step 1: the method comprises the steps of collecting state information of a target battery in real time through a BMS basic module, and accumulating the sum of times of overcharging, overdischarging, over-temperature, overcurrent and self-balancing of the target battery;
step 2: judging the sum of the accumulated times of overcharging, overdischarging, over-temperature, overcurrent and self-balancing of the target battery, and defining the health coefficient and the aging coefficient of the target battery;
step 3: combining the health coefficient and the aging coefficient with an algorithm for adjusting the charge-discharge parameters to obtain adjusted charge-discharge current parameters;
step 4: and transmitting the state information and the charge-discharge current parameters of the target battery to a charging facility through a communication module, and carrying out self-adaptive adjustment on the charge-discharge current of the target battery by the charging facility according to the communicated real-time information and the adjusted charge-discharge current parameters.
2. The method according to claim 1, wherein in step 1, the state information of the target battery includes a voltage of each unit cell, a current in a battery loop, temperature information of each temperature acquisition point inside the battery, and charge information of a battery pack.
3. The method for adaptively controlling a battery management system of a power tool according to claim 1, wherein step 2 specifically comprises: the slave BMS basic module reads the accumulated times of overcharge, overdischarge, overtemperature, overcurrent and self-balancing and judges, and when the cycle times are not more than 300, the health coefficient alpha=1 is selected; when the number of cycles is between 300 and 500, selecting a health coefficient alpha=0.95; when the cycle number exceeds 500, selecting a health coefficient alpha=0.93;
meanwhile, the secondary BMS basic module reads the accumulated times of battery charge and discharge cycles, judges the accumulated times, and selects an aging coefficient beta=1 when the accumulated times are not more than 500; when the cycle number is between 500 and 1000, selecting an aging coefficient beta=0.9; when the number of cycles exceeds 1000, the aging coefficient β=0.95 is selected.
4. The method according to claim 1, wherein in step 4, the charging facility includes a charger or a power tool.
5. The method according to claim 4, wherein when the charging facility selects a charger, parameters such as a charge cutoff voltage Vcof, a charge imbalance differential pressure Vcdif, a constant current charge current Icon, a charge high temperature cutoff temperature Tcof of the charger are calculated and updated, and an adjusted charge and discharge current parameter is obtained by combining α and β values; the calculation method comprises the following steps: v' cof =vcof α β; v' cdif=vcdif α β; i' con=icon α β D, D being the charging current temperature coefficient; t' cof =tcof α β; wherein V 'cof is an adjusted charge cutoff voltage, V' cdif is an adjusted charge imbalance differential pressure, I 'con is an adjusted constant current charge current, and T' cof is an adjusted charge high temperature cutoff temperature;
then, the voltage and the temperature of the real-time communication of the target battery are combined to carry out self-adaptive charging adjustment: stopping charging when the voltage Vmax of the single highest battery of the real-time voltage is more than or equal to V 'cof, otherwise, stopping charging when the unbalanced voltage difference of the real-time charging is more than or equal to V' cdif, otherwise, normally charging; when the ratio of the real-time temperature to the adjusted high-temperature cutoff temperature is greater than or equal to 0.6, the constant-current charging current needs to be multiplied by the real-time charging current temperature coefficient D, the value of D corresponds to the ratio, and when the real-time temperature is greater than or equal to the high-temperature cutoff temperature T' cof, the charging is stopped.
6. The method according to claim 4, wherein when the discharging facility selects the electric tool, the adjusted charge-discharge current parameters are calculated by combining the parameters of the discharge cutoff voltage Vdof, the discharge imbalance differential pressure Vddif, the discharge maximum allowable current Imax, the rated operating current Idret, and the discharge high-temperature cutoff temperature tdot with the values of α and β, and the calculation formula is as follows: v' dof=vdof α β; v' ddif=vdif α β; i' max=imax α β; i' dret=idret×f, F being the discharge current temperature coefficient; t' dof=tdofα β; wherein V ' dof is the adjusted discharge cut-off voltage, V ' ddif is the adjusted discharge unbalanced pressure difference, I ' max is the adjusted discharge maximum allowable current, I ' dret is the adjusted rated working current, and T ' dof is the adjusted discharge high-temperature cut-off temperature; then, carrying out self-adaptive discharge adjustment by combining the voltage and the temperature of the battery in real-time communication; stopping charging when the voltage Vmin of the single lowest battery of the real-time voltage is less than or equal to V' dof, otherwise, normally charging; stopping discharging when the real-time discharging unbalanced pressure difference is more than or equal to V' ddif, otherwise, normally discharging; when the ratio of the real-time temperature to the adjusted discharge high-temperature cutoff temperature is more than or equal to 0.6, the rated working current Idret needs to be multiplied by the real-time discharge current temperature coefficient F, the value of F corresponds to the ratio, and when the real-time working current of the motor is more than or equal to the discharge maximum allowable current I' max, the discharge is stopped; and stopping discharging when the real-time temperature is greater than or equal to the discharge high-temperature cutoff temperature T' dof.
7. The battery management system of the electric tool is characterized by comprising a BMS basic module, a charge-discharge parameter adjustment module, a communication module and a charge-discharge control execution module; the BMS basic module is used for collecting voltage, charging and discharging current, charging and discharging temperature, equalization information and battery charge state of the battery pack; the charging and discharging parameter adjustment module analyzes the information collected by the BMS basic module and performs optimization adjustment on the charging and discharging parameter strategy; the communication module is used for completing the communication of the adjusted parameters to the charger or the electric tool which correspondingly work through the charge-discharge parameter adjustment module; the charging and discharging control execution module refers to a corresponding charger or an electric tool, and adjusts real-time charging and discharging working parameters through the communicated parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310369060.XA CN116093467B (en) | 2023-04-10 | 2023-04-10 | Self-adaptive control method for battery management system of electric tool |
Applications Claiming Priority (1)
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