CN113078701A - Lithium battery charging management system and method thereof - Google Patents
Lithium battery charging management system and method thereof Download PDFInfo
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- CN113078701A CN113078701A CN202011192160.2A CN202011192160A CN113078701A CN 113078701 A CN113078701 A CN 113078701A CN 202011192160 A CN202011192160 A CN 202011192160A CN 113078701 A CN113078701 A CN 113078701A
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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
- 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
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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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- 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
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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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- Chemical & Material Sciences (AREA)
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a lithium battery charging management system and a method thereof, wherein the lithium battery charging management system comprises the following steps: the battery pack comprises a battery charger, an upper computer, a battery main control module and at least one battery pack module; the battery main control module comprises a control unit, a current detector and a relay, the battery pack module comprises a signal acquisition unit and at least one battery core, and the signal acquisition unit comprises a detection circuit and a balance circuit. The detection circuit and the balance circuit in the signal acquisition unit are respectively connected with the battery cell by using single wires, so that the situation of battery cell voltage acquisition distortion caused by the increase of the power of the balance circuit can be avoided, and the signal acquisition unit is suitable for the battery cell with larger capacity; the control unit is in signal connection with the battery charger, the control unit can be communicated with the battery charger for charging, in addition, the control unit also controls the output current of the battery charger according to the SOC charge state of the battery, the time required by equalization is greatly reduced, and the battery is charged and maintained, so that the damage of a battery core caused by the low-voltage over-discharge of the battery is avoided.
Description
Technical Field
The invention relates to the field of lithium battery charging, in particular to a lithium battery charging management system and a lithium battery charging management method.
Background
The charging control architecture of the current lithium battery management system is shown in fig. 1 and comprises a battery charger, an upper computer, a battery main control module and at least one battery pack module; the battery pack module comprises a signal acquisition unit and at least one battery cell, and the signal acquisition unit comprises a detection circuit and a balance circuit.
After the plurality of battery pack modules are connected in series to form a required power energy system, the battery pack modules are connected with a battery main control module and a battery charger, the battery main control module is also connected with an upper computer, a whole set of lithium battery system capable of being charged can be completed, and the whole set of battery system is subjected to unified charging control through the upper computer.
Currently, the general control strategy for the lithium battery management system in the market charging is as follows:
(1) after the battery charger is connected with the battery main control module, the upper computer sends a charging instruction to the battery main control module, the battery main control module closes the relay, the charging loop is connected, relevant information of the battery system is read back, if the battery system is in a normal State, the charging instruction is sent to the battery charger to start charging, and the control unit calculates the SOC (State of charge) value of the battery core through the current detector in a coulomb calculation mode.
(2) The control unit continuously communicates with the signal acquisition unit to acquire the temperature and the charging state of the battery core, the signal acquisition unit acquires the voltage value of the battery core through the detection circuit during charging, compares the voltage value with a set overcharge protection voltage value, sends an alarm to the control unit when the voltage value exceeds a set value, and the control unit synchronously starts the balance circuit to perform micro power discharge on the battery core until the voltage value of the battery core is lower than the set protection value and releases the overcharge protection state; meanwhile, after the control unit receives the alarm sent by the signal acquisition unit, the relay is also disconnected, so that the connection with a battery charger loop is disconnected for protection, and the overcharge protection condition can be carried out until the signal acquisition unit releases the alarm, and then the charging process can be carried out.
With the above connection mode and charging control strategy, the following problems exist:
(1) the detection circuit and the balance circuit in the current signal acquisition unit share one signal line due to cost consideration, and when the balance circuit is started, voltage drop is generated to enable the voltage value of the battery cell acquired by the detection circuit to deviate from the true value. Because of the above problems, most of the balance circuits in the signal acquisition units on the market are configured with a small power resistor to avoid the acquisition distortion of the detection circuit caused by voltage drop, but when the balance circuit is configured in a large-capacity battery cell, the battery cell cannot be maintained because the discharge time of the battery cell is too long due to the too small power of the balance circuit.
(2) The whole set of charging system carries out charging management through the upper computer, and if the upper computer is off-line for a long time, the battery core is in a low SOC state and cannot be charged in time, so that the battery core is damaged due to low voltage.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a lithium battery charging management system and method thereof, for solving the problem that when the detection circuit and the balancing circuit in the prior art share one signal line, and are applied to a large-capacity battery cell, the battery cell cannot be maintained because the power of the balancing circuit is too low, which results in too long discharge time of the battery cell; and the whole charging system carries out charging management through the upper computer, and when the upper computer is off-line for a long time, the battery core cannot be charged in time in a low SOC state, so that the problem of damage to the battery core due to low voltage is caused.
To achieve the above and other related objects, the present invention provides a lithium battery charging management system, including: the battery pack comprises a battery charger, an upper computer, a battery main control module and at least one battery pack module;
the battery main control module comprises a control unit, a current detector and a relay, the battery pack module comprises a signal acquisition unit and at least one battery core, the positive electrode of the battery core is the positive electrode output end of the battery pack module, the negative electrode of the battery core is the negative electrode output end of the battery pack module,
the control unit is respectively in communication connection with the upper computer and the signal end of the battery charger, the control unit is also respectively connected with the control end of the current detector and the control end of the relay,
the input end of the current detector is connected with the positive output end of the battery pack module, the output end of the current detector and the negative output end of the battery pack module are respectively connected with one end of a switch contact of the relay, and the other end of the switch contact of the relay is connected with the battery charger;
the signal acquisition unit comprises a detection circuit and a balance circuit, the input ends of the detection circuit and the balance circuit are respectively connected with one power output end of the battery core, and the output ends of the detection circuit and the balance circuit are in communication connection with the control unit.
In an embodiment of the invention, the number of the battery cores is multiple, the power output ends of the battery cores are connected in series, the serially connected positive electrode is used as the positive electrode output end of the battery pack module and connected with the input end of the current detector, and the serially connected negative electrode is used as the negative electrode output end of the battery pack module and connected with the switch contact of the relay.
In an embodiment of the invention, the number of the battery pack modules is multiple, the power output ends of the battery pack modules are connected in series, the serially connected anodes serve as the anode output ends of the battery pack modules and are connected with the input end of the current detector, the serially connected cathodes serve as the cathode output ends of the battery pack modules and are connected with the switch contact of the relay, and the signal output ends of the signal acquisition units are respectively connected with the control unit in a communication manner.
In an embodiment of the invention, the balancing circuit includes a high power resistor.
The invention also provides a lithium battery charging management method, which is applied to any one of the lithium battery charging management systems, and comprises the following steps:
the method comprises the following steps that firstly, an upper computer receives a signal that a battery charger is connected with a battery main control module, sends a first charging instruction to a control unit, the control unit sends a control signal to a control end of a relay according to the charging instruction, closes the relay, connects a charging loop and the battery charger, and simultaneously sends a second charging instruction to the battery charger to start charging; the control unit also sends a control signal to the control end of the current detector to start the current detector, the control unit obtains the current value of the battery core in real time through the current detector, calculates the SOC value of the battery core according to the current value, and adjusts the output current value of the battery charger according to the SOC value;
step two, the signal acquisition unit acquires the voltage value of the battery core in real time through the detection circuit and compares the voltage value with a plurality of preset voltage values;
when the voltage value of the battery core reaches a first preset voltage value, the signal acquisition unit sends a first alarm signal to the control unit, the control unit sends a control signal to the control end of the relay according to the first alarm signal, the relay is disconnected, the charging loop and the battery charger are disconnected, meanwhile, a starting instruction is sent to a balance circuit of the signal acquisition unit, and the balance circuit is started to discharge the battery core;
step four, when the voltage value of the battery core is reduced from a first preset voltage value to a second preset voltage value, the signal acquisition unit sends a second alarm signal to the control unit, the control unit sends a control signal to a control end of the relay according to the second alarm signal, the relay is closed, the charging loop and the battery charger are connected, meanwhile, a low current output limiting command is sent to the battery charger, the battery charger adjusts output current at the moment, and low current trickle charging action is executed;
step five, when the voltage value of the battery cell is reduced from the second preset voltage value to a third preset voltage value, the signal acquisition unit sends a third alarm signal to the control unit, and the control unit sends a closing instruction to a balance circuit of the signal acquisition unit according to the third alarm signal and closes the balance circuit;
step six, when the voltage value of the battery cell rises from a third preset voltage value to a fourth preset voltage value, the signal acquisition unit sends a fourth alarm signal to the control unit, the control unit sends a starting instruction to a balance circuit of the signal acquisition unit according to the fourth alarm signal, and the balance circuit is started to discharge the battery cell;
and seventhly, when the voltage value of the battery core is reduced from the fourth preset voltage value to the fifth preset voltage value again, repeating the fifth step until the voltage value of the battery core is stabilized within the range of the sixth preset voltage value, sending a fifth alarm signal to the control unit by the signal acquisition unit, sending a control signal to the control end of the relay by the control unit according to the fifth alarm signal, disconnecting the relay, disconnecting the charging loop from the battery charger, and sending a charging stopping instruction to the battery charger.
In an embodiment of the present invention, the first step of the method further includes: the control unit sends charging power to the battery charger, and the battery charger adjusts an output current value according to the charging power.
In an embodiment of the present invention, the fourth step of the method further includes: the control unit sends the charging state of the battery cell to the upper computer, and the upper computer displays the charging state as the maintenance of the battery cell.
In an embodiment of the present invention, the seventh step of the method further includes: the control unit sends the charging state of the battery cell to the upper computer, and the upper computer displays the charging state as the maintenance completion of the battery cell.
In an embodiment of the invention, the third predetermined voltage value is equal to the fifth predetermined voltage value, and the second predetermined voltage value is equal to the fourth predetermined voltage value.
In an embodiment of the invention, the range of the sixth predetermined voltage value is greater than the third predetermined voltage value and smaller than the second predetermined voltage value.
As described above, the lithium battery charging management system and the method thereof of the present invention have the following beneficial effects:
1. the high-power resistor is adopted in the balance circuit, so that the power of the balance circuit in the signal acquisition unit is increased, the discharge balance current is reduced, and the balance capability of the battery core can be accelerated;
2. the detection circuit and the balance circuit in the signal acquisition unit are respectively connected with the battery cell by using single wires, so that the condition that the voltage acquisition of the battery cell is distorted due to the increase of the power of the balance circuit can be avoided;
3. the control unit is in signal connection with the battery charger through a special communication port, unified allocation control management is not performed only by an upper computer, after an upper computer system is offline, if the battery needs to be charged, the control unit and the battery charger can be used for communicating and charging, the upper computer only needs to issue a charging instruction and a charging power value, and all the other parts are subjected to all-weather autonomous management by the control unit;
compared with the prior system which performs balancing when the battery core is overcharged, the newly designed architecture and control logic can greatly reduce the time required by balancing, and the new architecture is more suitable for the battery core with larger capacity; in addition, the newly designed loop architecture can enable the lithium battery management system to directly control the output current of the battery charger according to the current state of the battery cell, and enable the lithium battery management system to charge and maintain the battery according to the current SOC charge state of the battery, so that the damage of the battery cell caused by the over-discharge of the low voltage of the battery is avoided.
Drawings
Fig. 1 shows a block diagram of the overall structure disclosed in the prior art of the present invention.
Fig. 2 shows a block diagram of the overall structure disclosed in the first embodiment of the present invention.
Fig. 3 shows a cell voltage equalization control map disclosed in the second embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in practical implementation, and the type, quantity and proportion of the components in practical implementation can be changed freely, and the layout of the components can be more complicated.
Referring to fig. 2, a first embodiment of the present invention provides a lithium battery charging management system, which includes: the battery pack comprises a battery charger, an upper computer, a battery main control module and at least one battery pack module; the battery main control module and at least one battery pack module form a charging loop.
And the upper computer sends a first charging instruction to the battery main control module when receiving a connection signal that the battery charger is connected to the charging loop, and sends a second charging instruction to the battery charger after the battery main control module receives the first charging instruction.
The battery pack module comprises a signal acquisition unit and at least one battery core, wherein the signal acquisition unit comprises a detection circuit and a balance circuit, the positive electrode of the battery core is the positive electrode output end of the battery pack module, and the negative electrode of the battery core is the negative electrode output end of the battery pack module.
The input ends of the detection circuit and the balancing circuit are respectively and independently connected with one power output end of the battery core, and by adopting the scheme, the situation that the voltage acquisition of the battery core is distorted due to the fact that the power of the balancing circuit is improved can be avoided, and the balancing circuit can adopt a high-power resistor, so that when the system is configured in a large-capacity battery core, the discharging time of the battery core is accelerated, and the battery core enters a charging equalization mode more quickly.
The detection circuit is used for acquiring the real-time voltage value of the battery core, the signal acquisition unit compares the real-time voltage value with a plurality of preset voltage values, and when the real-time voltage value exceeds each preset voltage value, a corresponding alarm signal is sent to the battery main control module.
The balancing circuit is used for discharging the battery cell according to the received starting instruction, and reducing the voltage value of the battery cell.
It should be noted that, the number of the battery cells may be multiple, the power output ends of the battery cells are connected in series, the positive electrode after the series connection is used as the positive electrode output end of the battery pack module and connected with the input end of the current detector, and the negative electrode after the series connection is used as the negative electrode output end of the battery pack module and connected with the switch contact of the relay. When the number of the battery cells is multiple, the input ends of the detection circuit and the balancing circuit can be connected with one power supply output end of one battery cell optionally.
The number of the battery pack modules can be multiple, the power output ends of the battery pack modules are connected in series, the anodes after the series connection are used as the anode output ends of the battery pack modules and connected with the input end of the current detector, the cathodes after the series connection are used as the cathode output ends of the battery pack modules and connected with the switch contact of the relay, and the signal output ends of the signal acquisition units are respectively in communication connection with the control unit.
The battery main control module comprises a control unit, a current detector and a relay, wherein the control unit is respectively in communication connection with the signal output ends of the upper computer, the battery charger and the signal acquisition unit.
By adopting the scheme, the control unit sends a second charging instruction to the battery charger after receiving the first charging instruction sent by the upper computer.
The control unit is also connected with the control end of the current detector and the control end of the relay respectively, the input end of the current detector is connected with the positive electrode output end of the battery pack module, the output end of the current detector and the negative electrode output end of the battery pack module are connected with one end of a switch contact of the relay respectively, and the other end of the switch contact of the relay is connected with the battery charger.
The control unit obtains the current value of the battery cell through the current detector, calculates the SOC value of the battery cell according to the current value, and adjusts the output current value of the battery charger according to the SOC value.
The control unit acquires an overshoot alarm signal of the battery cell through the signal acquisition unit, and controls the on/off of the relay according to the overshoot alarm signal to realize the on/off of the battery charger and the charging loop; meanwhile, the balance circuit is controlled to be started according to the overshoot alarm signal, so that the battery cell is discharged.
Therefore, the control unit of the embodiment acquires the SOC state of the battery cell through the current detector, acquires the overshoot alarm signal of the battery cell through the signal acquisition unit, and controls the relay to be closed or opened according to the overshoot alarm signal to realize the connection or disconnection between the battery charger and the charging loop; the battery cell is discharged by controlling the starting of the balance circuit.
In addition, the control unit is communicated with the upper computer in real time, and the charging state of the battery core is displayed through the upper computer.
A second embodiment of the present invention provides a lithium battery charging management method applied to the lithium battery charging management system described in the first embodiment, wherein the control strategy is mainly embodied in that the voltage of all the battery cells is controlled within the same range to improve the consistency of the battery cell capacity.
Referring to fig. 3, the specific steps include:
the method comprises the following steps that firstly, an upper computer receives a signal that a battery charger is connected with a battery main control module, sends a first charging instruction to a control unit, the control unit sends a control signal to a control end of a relay according to the charging instruction, closes the relay, connects a charging loop and the battery charger, and sends charging power and a second charging instruction to the battery charger to start charging;
in addition, the control unit also sends a control signal to the control end of the current detector, the current detector starts to work, the control unit obtains the current value of the battery core in real time through the current detector, calculates the SOC value of the battery core according to the current value, and adjusts the output current value of the battery charger according to the charging power and the SOC value.
And step two, the signal acquisition unit acquires the voltage value of the battery cell in real time through the detection circuit and compares the voltage value of the battery cell with a plurality of preset voltage values.
When the voltage value of the battery core reaches a first preset voltage value, the signal acquisition unit sends a first alarm signal to the control unit, the control unit sends a control signal to the control end of the relay according to the first alarm signal, the relay is disconnected, the charging loop and the battery charger are disconnected, meanwhile, a starting instruction is sent to a balance circuit of the signal acquisition unit, the balance circuit starts equalization to discharge the battery core, and at the moment, the voltage value of the battery core is reduced; the first preset voltage value corresponds to the overcharge point (a) in fig. 3.
Step four, when the voltage value of the battery core is reduced from a first preset voltage value to a second preset voltage value, the signal acquisition unit sends a second alarm signal to the control unit, the control unit sends a control signal to a control end of the relay according to the second alarm signal, the relay is closed, the charging loop and the battery charger are connected, and meanwhile, a low current output limiting command is sent to the battery charger, the battery charger adjusts output current and executes low current trickle charging action, in the embodiment, the current output of the battery charger is about 0.2A, and the setting is required to be lower than the maximum current value of the load of the balancing circuit; the second preset voltage value corresponds to a recovery point (b) in fig. 3.
In addition, the control unit also sends the charging state of the battery cell to the upper computer at the moment, and displays the charging state as the maintenance of the battery cell.
And step five, when the voltage value of the battery core is reduced from the second preset voltage value to a third preset voltage value, the signal acquisition unit sends a third alarm signal to the control unit, the control unit sends a closing instruction to the balance circuit of the signal acquisition unit according to the third alarm signal, the balance circuit is closed, and the battery core is charged in a low-current mode. Wherein the third preset voltage value corresponds to the turn-off point (c) in fig. 3.
And step six, when the voltage value of the battery cell rises from the third preset voltage value to the fourth preset voltage value, the signal acquisition unit sends a fourth alarm signal to the control unit, the control unit sends a starting instruction to the balance circuit of the signal acquisition unit according to the fourth alarm signal, and the balance circuit is started to discharge the battery cell. The fourth preset voltage value corresponds to the recovery point (b1) in fig. 3.
And seventhly, when the voltage value of the battery core is reduced from the fourth preset voltage value to the fifth preset voltage value again, repeating the fifth step until the voltage value of the battery core is stabilized within the range of the sixth preset voltage value, sending a fifth alarm signal to the control unit by the signal acquisition unit, sending a control signal to the control end of the relay by the control unit according to the fifth alarm signal, disconnecting the relay, disconnecting the charging loop from the battery charger, and sending a charging stopping instruction to the battery charger. Wherein the fifth preset voltage value corresponds to the turn-off point (c1) in fig. 3.
In addition, the control unit also sends the charging state of the battery cell to the upper computer at the moment, and displays the charging state as the maintenance completion of the battery cell.
It should be noted that, in this embodiment, the second preset voltage value is equal to the fourth preset voltage value, the third preset voltage value is equal to the fifth preset voltage value, and the range of the sixth preset voltage value is greater than the third preset voltage value and smaller than the second preset voltage value. In actual use, the magnitude of each preset voltage value can be set according to needs, and details are not repeated here.
In summary, the lithium battery charging management system and the method thereof of the present invention can improve the consistency of the battery cells in the battery system with minimal changes, compared with the old system in which the battery cells are equalized when the battery cells are overcharged, the newly designed architecture and control logic can greatly reduce the time required for equalization, and the new architecture is more suitable for the battery cells with larger capacity; in addition, the newly designed loop architecture can enable the lithium battery management system to directly control the output current with the charger according to the current state of the battery cell, so that the lithium battery management system can charge and maintain the battery according to the current SOC charge state of the battery, and the battery cell damage caused by the over-discharge of the battery low voltage is avoided. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A lithium battery charging management system, comprising: the battery pack comprises a battery charger, an upper computer, a battery main control module and at least one battery pack module;
the battery main control module comprises a control unit, a current detector and a relay, the battery pack module comprises a signal acquisition unit and at least one battery core, the positive electrode of the battery core is the positive electrode output end of the battery pack module, the negative electrode of the battery core is the negative electrode output end of the battery pack module,
the control unit is respectively in communication connection with the upper computer and the signal end of the battery charger, the control unit is also respectively connected with the control end of the current detector and the control end of the relay,
the input end of the current detector is connected with the positive output end of the battery pack module, the output end of the current detector and the negative output end of the battery pack module are respectively connected with one end of a switch contact of the relay, and the other end of the switch contact of the relay is connected with the battery charger;
the signal acquisition unit comprises a detection circuit and a balance circuit, the input ends of the detection circuit and the balance circuit are respectively connected with one power output end of the battery core, and the output ends of the detection circuit and the balance circuit are in communication connection with the control unit.
2. The lithium battery charging management system of claim 1, wherein: the number of the battery cores is multiple, the power output ends of the battery cores are connected in series, the serially connected positive electrode serves as the positive electrode output end of the battery pack module and is connected with the input end of the current detector, and the serially connected negative electrode serves as the negative electrode output end of the battery pack module and is connected with the switch contact of the relay.
3. The lithium battery charging management system according to claim 1 or 2, characterized in that: the number of the battery pack modules is multiple, the power output ends of the battery pack modules are connected in series, the anodes of the battery pack modules after being connected in series serve as the anode output ends of the battery pack modules and are connected with the input end of the current detector, the cathodes of the battery pack modules after being connected in series serve as the cathode output ends of the battery pack modules and are connected with the switch contact of the relay, and the signal output ends of the signal acquisition units are respectively in communication connection with the control unit.
4. The lithium battery charging management system of claim 1, wherein: the balancing circuit includes a high power resistor.
5. A lithium battery charging management method, characterized in that the method is applied to the lithium battery charging management system according to any one of claims 1-4, and the method comprises the following steps:
the method comprises the following steps that firstly, an upper computer receives a signal that a battery charger is connected with a battery main control module, sends a first charging instruction to a control unit, the control unit sends a control signal to a control end of a relay according to the charging instruction, closes the relay, connects a charging loop and the battery charger, and simultaneously sends a second charging instruction to the battery charger to start charging; the control unit also sends a control signal to the control end of the current detector to start the current detector, the control unit obtains the current value of the battery core in real time through the current detector, calculates the SOC value of the battery core according to the current value, and adjusts the output current value of the battery charger according to the SOC value;
step two, the signal acquisition unit acquires the voltage value of the battery core in real time through the detection circuit and compares the voltage value with a plurality of preset voltage values;
when the voltage value of the battery core reaches a first preset voltage value, the signal acquisition unit sends a first alarm signal to the control unit, the control unit sends a control signal to the control end of the relay according to the first alarm signal, the relay is disconnected, the charging loop and the battery charger are disconnected, meanwhile, a starting instruction is sent to a balance circuit of the signal acquisition unit, and the balance circuit is started to discharge the battery core;
step four, when the voltage value of the battery core is reduced from a first preset voltage value to a second preset voltage value, the signal acquisition unit sends a second alarm signal to the control unit, the control unit sends a control signal to a control end of the relay according to the second alarm signal, the relay is closed, the charging loop and the battery charger are connected, meanwhile, a low current output limiting command is sent to the battery charger, the battery charger adjusts output current at the moment, and low current trickle charging action is executed;
step five, when the voltage value of the battery cell is reduced from the second preset voltage value to a third preset voltage value, the signal acquisition unit sends a third alarm signal to the control unit, and the control unit sends a closing instruction to a balance circuit of the signal acquisition unit according to the third alarm signal and closes the balance circuit;
step six, when the voltage value of the battery cell rises from a third preset voltage value to a fourth preset voltage value, the signal acquisition unit sends a fourth alarm signal to the control unit, the control unit sends a starting instruction to a balance circuit of the signal acquisition unit according to the fourth alarm signal, and the balance circuit is started to discharge the battery cell;
and seventhly, when the voltage value of the battery core is reduced from the fourth preset voltage value to the fifth preset voltage value again, repeating the fifth step until the voltage value of the battery core is stabilized within the range of the sixth preset voltage value, sending a fifth alarm signal to the control unit by the signal acquisition unit, sending a control signal to the control end of the relay by the control unit according to the fifth alarm signal, disconnecting the relay, disconnecting the charging loop from the battery charger, and sending a charging stopping instruction to the battery charger.
6. The lithium battery charging management method of claim 5, wherein the first step of the method further comprises: the control unit sends charging power to the battery charger, and the battery charger adjusts an output current value according to the charging power.
7. The lithium battery charging management method according to claim 5, wherein the fourth step of the method further comprises: the control unit sends the charging state of the battery cell to the upper computer, and the upper computer displays the charging state as the maintenance of the battery cell.
8. The lithium battery charging management method according to claim 5, wherein the seventh step of the method further comprises: the control unit sends the charging state of the battery cell to the upper computer, and the upper computer displays the charging state as the maintenance completion of the battery cell.
9. The lithium battery charging management method according to claim 5, wherein: the third preset voltage value is equal to the fifth preset voltage value, and the second preset voltage value is equal to the fourth preset voltage value.
10. The lithium battery charging management method according to claim 9, wherein: the range of the sixth preset voltage value is larger than the third preset voltage value and smaller than the second preset voltage value.
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