CN113629796A - Parallel control device of lithium ion battery pack - Google Patents
Parallel control device of lithium ion battery pack Download PDFInfo
- Publication number
- CN113629796A CN113629796A CN202110712054.0A CN202110712054A CN113629796A CN 113629796 A CN113629796 A CN 113629796A CN 202110712054 A CN202110712054 A CN 202110712054A CN 113629796 A CN113629796 A CN 113629796A
- Authority
- CN
- China
- Prior art keywords
- battery pack
- module
- total pressure
- main control
- control module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 23
- 238000007600 charging Methods 0.000 claims abstract description 29
- 238000012544 monitoring process Methods 0.000 claims abstract description 27
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with battery
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- H—ELECTRICITY
- 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
-
- 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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a parallel control device of a lithium ion battery pack, which comprises a first battery pack monitoring module, a second battery pack monitoring module, a main control module, a closed-loop feedback module and a power switch module, wherein the first battery pack monitoring module is connected with the second battery pack monitoring module; the first battery pack monitoring module is used for sampling the total pressure of the first battery pack and transmitting the total pressure to the main control module; the second battery pack monitoring module is used for sampling the total pressure of the second battery pack and transmitting the total pressure to the main control module; the main control module compares the total pressure of the first battery pack and the total pressure of the second battery pack and sends a reference voltage instruction to the closed-loop feedback module; the closed loop feedback module regulates the voltage output to the power switch module; the power switch module adjusts charging current between the first battery pack and the second battery pack according to the voltage output by the closed-loop feedback module. The invention improves the charging and discharging efficiency between the battery packs, can effectively reduce the damage of pulse current generated after the parallel switch is closed to the battery packs, and prolongs the service life of the battery packs.
Description
Technical Field
The invention relates to a parallel control device of a lithium ion battery pack, belonging to the field of power supplies.
Background
In order to meet the requirement of high-power electric equipment, a plurality of lithium ion battery packs are generally connected in parallel to increase the output power, but the following problems are caused: the voltage between battery packs is greatly different due to the inconsistency of internal impedance and reaction kinetics of the battery cells. If a direct parallel connection mode is adopted, a large loop current is generated, therefore, the traditional method is to connect a large power resistor in series between the battery packs so as to reduce the loop current, and when the loop current is reduced to a certain value, switches connected in parallel at two ends of the power resistor are closed, so that the parallel connection of a plurality of battery packs is realized. Although this method can reduce the damage of the circulation current to the battery to some extent, it has the following disadvantages: 1) the volume of the power resistor is large; 2) the designed resistance and power are not necessarily realized by one resistor, and a plurality of resistors are required to be connected in series and in parallel; 3) once the resistance value is determined, the maximum charging current between the battery packs cannot be changed, and the charging efficiency is undoubtedly reduced for the battery packs which can accept inconsistent maximum charging current; 4) the resistance value of the power resistor is easily influenced by temperature, so that the charging current is influenced, and if the designed margin is very small, the battery can be damaged to a certain extent; 5) because the resistor has larger voltage drop, after the closed-loop switch is closed, the battery pack still has larger pulse current, which causes certain damage to the battery pack.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a parallel control device of a lithium ion battery pack.
The purpose of the invention is realized by the following technical scheme:
a parallel control device of a lithium ion battery pack comprises a first battery pack monitoring module, a second battery pack monitoring module, a main control module, a closed-loop feedback module and a power switch module;
a first battery pack monitoring module: the system comprises a main control module, a first battery pack, a second battery pack, a first battery pack, a second battery pack, a third battery pack, a fourth battery pack, a fifth battery pack, a sixth battery pack, a fifth battery pack, a sixth battery pack, a fifth battery pack, a sixth battery pack, a fourth battery pack;
a second battery pack monitoring module: the system comprises a main control module, a first battery pack, a second battery pack, a first battery pack and a second battery pack, wherein the main control module is used for sampling the total pressure of the second battery pack, the current between the first battery pack and the second battery pack and the temperature of each monitoring node in the second battery pack and transmitting the total pressure, the current and the temperature to the main control module in a bus communication mode;
a main control module: comparing the total pressure of the first battery pack and the total pressure of the second battery pack, and sending a reference voltage instruction to a closed-loop feedback module;
a closed loop feedback module: regulating the voltage output to the power switch module according to the reference voltage and the feedback voltage by combining a zero pole compensation network;
a power switch module: and adjusting the charging current between the first battery pack and the second battery pack according to the voltage output by the closed-loop feedback module.
The closed-loop feedback module comprises a first operational amplifier unit, a second operational amplifier unit, a feedback resistor R1, a feedback resistor R2, a first pole-zero compensation network and a second pole-zero compensation network;
the main control module is provided with two paths of outputs, the first path of output is connected to the equidirectional input end of the first operational amplifier unit, the second path of output is connected to the equidirectional input end of the second operational amplifier unit, one end of the feedback resistor R1 is connected to the reverse input end of the first operational amplifier unit, and the other end of the feedback resistor R1 is connected with the positive output end of the first battery pack; one end of the feedback resistor R2 is connected to the reverse input end of the second operational amplifier unit, and the other end of the feedback resistor R2 is connected to the positive output end of the second battery pack;
the first pole-zero compensation network is formed by connecting a resistor R3 and a capacitor C1 in parallel, is connected between the reverse input end and the output end of the first operational amplifier unit and provides pole-zero compensation for the closed-loop feedback module;
the second pole-zero compensation network is formed by connecting a resistor R4 and a capacitor C2 in parallel, is connected between the reverse input end and the output end of the second operational amplifier unit and provides pole-zero compensation for the closed-loop feedback module;
the ground of the first operational amplifier unit is connected to the anode of the first battery pack, and the ground of the second operational amplifier unit is connected to the anode of the second battery pack.
When the total pressure of the second battery pack is greater than that of the first battery pack, the first output of the main control module is the maximum charging current R1 which can be accepted by the first battery pack, and the second output is 0;
when the total pressure of the first battery pack is greater than that of the second battery pack, the second output of the main control module is the maximum charging current R2 which can be received by the second battery pack, and the first output is 0.
A first fuse is provided between the positive electrode of the first battery pack and the resistor R1, and a second fuse is provided between the positive electrode of the second battery pack and the resistor R2.
The power switch module comprises a switch tube K1 and a switch tube K2;
the grid of switch tube K1 is connected to the output of first fortune unit of putting, and the grid of switch tube K2 is connected to the output of second fortune unit of putting, and the source electrode of switch tube K1 is connected with the reverse input end of first fortune unit of putting, and the drain electrode of switch tube K1 is connected with the drain electrode of switch tube K2, and the source electrode of switch tube K2 is connected with the reverse input end of second fortune unit of putting.
The first battery pack monitoring module, the second battery pack monitoring module and the main control module are connected to a bus in a hanging mode in a communication mode, and a data transmission function can be achieved.
The positive electrode of the first battery pack is connected with the positive electrode of the second battery pack through a relay K3, and the first battery pack and the second battery pack are connected in parallel and then are connected with a load or a charger through a relay K4;
after charging and discharging between the first battery pack and the second battery pack are completed, the main control module controls the relay K3 to be switched on, the switch tube K1 and the switch tube K2 to be switched off, the relay K4 is switched on, the first battery pack and the second battery pack which are connected in parallel discharge to a load, or the charger charges the first battery pack and the second battery pack which are connected in parallel.
The first battery pack, the second battery pack 2 and the load or charger are grounded.
The main control module adopts a step current reduction mechanism, and the realization method is as follows:
the main control module receives the total pressure of the first battery pack and the total pressure of the second battery pack, and when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set first differential pressure threshold value, the main control module sends a reference voltage command to reduce the current between the first battery pack and the second battery pack to 80% of an initial value; when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set second differential pressure threshold value, reducing the current between the first battery pack and the second battery pack to 60% of the initial value by sending a reference voltage instruction; when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set third pressure difference threshold value, the current between the first battery pack and the second battery pack is reduced to 40% of the initial value by sending a reference voltage instruction until the total pressure of the first battery pack is the same as the total pressure of the second battery pack, and charging and discharging between the first battery pack and the second battery pack are completed.
Compared with the prior art, the invention has the following advantages:
(1) the invention sets reference voltage through the main control module, controls the current flowing through the switching tube under the action of the closed-loop feedback module, and is beneficial to flexibly adjusting the maximum charging current acceptable by different lithium ion battery packs and improving the charging and discharging efficiency among the battery packs compared with the method of adopting a series power resistor mode and adopting a method of adjusting the grid source voltage of the switching tube to enable the switching tube to work in a constant current region in the prior art.
(2) The invention realizes the series-parallel connection function of a plurality of power resistors by utilizing the heating loss of the switching tube, can be applied to different battery packs without the differentiated design of current limiting among the battery packs for a plurality of lithium ion battery packs, and improves the universality to a great extent.
(3) According to the invention, the charging control strategy among the lithium ion battery packs is realized by monitoring the charging current in real time, and once the node temperature of the battery pack is monitored to be higher, the charging current is gradually reduced, so that the safety and the reliability can be effectively improved.
(4) The parallel control circuit has the advantages of simple structure, easy layout and wiring, small occupied volume, capability of secondarily improving the existing parallel control circuit, capability of realizing the adjustable current charging function among the lithium ion battery packs, minimum change, easiness in realization and low cost based on secondary improvement of the mature prior art.
(5) According to the invention, the switching tube works in a constant current region for large-current charging and works in a saturation region for constant-voltage charging, so that the voltage difference between the lithium ion battery packs is further reduced.
Drawings
Fig. 1 is a working schematic diagram of a parallel control device of a lithium ion battery pack according to the present invention.
Detailed Description
As shown in fig. 1, the parallel control device of the lithium ion battery pack includes a first battery pack monitoring module 1, a second battery pack monitoring module 2, a main control module, a closed-loop feedback module, and a power switch module. The first battery pack monitoring module 1 samples the total pressure, the branch current (the current between the first battery pack and the second battery pack) and the node temperature of the first battery pack 1, the second battery pack monitoring module 2 samples the total pressure, the branch current and the node temperature of the second battery pack 2, the sampled data are uploaded to the main control module in a bus communication mode, and the main control module compares the total pressures of the two battery packs and sends a reference voltage instruction to the closed-loop feedback module.
The closed-loop feedback module comprises a first operational amplifier unit, a second operational amplifier unit, a feedback resistor R1, a feedback resistor R2, a first pole-zero compensation network and a second pole-zero compensation network; the main control module is provided with two paths of outputs, the first path of output is connected to the equidirectional input end of the first operational amplifier unit, the second path of output is connected to the equidirectional input end of the second operational amplifier unit, one end of the feedback resistor R1 is connected to the reverse input end of the first operational amplifier unit, and the other end of the feedback resistor R1 is connected with the positive output end of the first battery pack; one end of the feedback resistor R2 is connected to the reverse input end of the second operational amplifier unit, and the other end of the feedback resistor R2 is connected to the positive output end of the second battery pack; the first pole-zero compensation network is formed by connecting a resistor R3 and a capacitor C1 in parallel, is connected between the reverse input end and the output end of the first operational amplifier unit and provides pole-zero compensation for the closed-loop feedback module; the second pole-zero compensation network is formed by connecting a resistor R4 and a capacitor C2 in parallel, is connected between the reverse input end and the output end of the second operational amplifier unit and provides pole-zero compensation for the closed-loop feedback module; the ground of the first operational amplifier unit is connected to the anode of the first battery pack, and the ground of the second operational amplifier unit is connected to the anode of the second battery pack.
A first fuse is provided between the positive electrode of the first battery pack and the resistor R1, and a second fuse is provided between the positive electrode of the second battery pack and the resistor R2. The protection circuit is used for protecting the battery pack and avoiding charging and discharging overcurrent.
The power switch module comprises a switch tube K1 and a switch tube K2; the grid of switch tube K1 is connected to the output of first fortune unit of putting, and the grid of switch tube K2 is connected to the output of second fortune unit of putting, and the source electrode of switch tube K1 is connected with the reverse input end of first fortune unit of putting, and the drain electrode of switch tube K1 is connected with the drain electrode of switch tube K2, and the source electrode of switch tube K2 is connected with the reverse input end of second fortune unit of putting.
The specific reference voltage command is as follows: if the total voltage of the first battery pack 1 is greater than the total voltage of the second battery pack 2, the main control module outputs a reference voltage Vref1(Vref1 is 0) to the unidirectional input end of the first operational amplifier unit, and simultaneously outputs a reference voltage Vref2(Vref2 is the maximum charging current acceptable for the battery pack 2R 2) to the unidirectional input end of the second operational amplifier unit. The voltage on the inverting input end sampling resistor R1 of the first operational amplifier unit compensates the zero pole through the resistor R3 and the capacitor C1 in the first PI network (first zero pole compensation network), adjusts the output voltage of the first operational amplifier unit, namely the gate-source voltage of the switch tube K1, and controls the switch tube K1 to be switched off. Meanwhile, the voltage on the reverse input end sampling resistor R2 of the second operational amplifier unit compensates a zero pole through a resistor R4 and a capacitor C2 in a second PI network (a second zero pole compensation network), the output voltage of the second operational amplifier unit, namely the gate-source voltage of the switching tube K2, is adjusted, and the current value flowing through the switching tube K2 is controlled; if the total voltage of the second battery pack 2 is greater than the total voltage of the first battery pack 1, the main control module outputs a reference voltage Vref2(Vref2 is 0) to the unidirectional input terminal of the second operational amplifier unit, and simultaneously outputs a reference voltage Vref1(Vref1 is the maximum charging current acceptable for the battery pack 1R 1) to the unidirectional input terminal of the first operational amplifier unit. The voltage on the inverting input end sampling resistor R2 of the second operational amplifier unit compensates the zero pole through the resistor R4 and the capacitor C2 in the second PI network, adjusts the output voltage of the second operational amplifier unit, namely the gate-source voltage of the switch tube K2, and controls the switch tube K2 to be switched off. Meanwhile, the voltage on the reverse input end sampling resistor R1 of the first operational amplifier unit compensates a zero pole through the resistor R3 and the capacitor C1 in the first PI network, the output voltage of the first operational amplifier unit, namely the gate-source voltage of the switching tube K1, is adjusted, and the current value flowing through the switching tube K1 is controlled.
The main control module is designed with a three-level temperature alarm mechanism, after the first battery pack monitoring module and the second battery pack monitoring module upload node temperature data to the bus, the main control module receives the node temperature data, compares the received data with a set threshold value 1, and sets the reference of the current between the first battery pack and the second battery pack to 80% of the initial value if the set threshold value 1 is reached; if the set threshold value 2 is reached, setting the reference of the current between the first battery pack and the second battery pack to be 60% of the initial value; if the set threshold value 3 is reached, the charging between the battery packs is stopped.
The main control module adopts a step current reduction mechanism, and the realization method is as follows:
the main control module receives the total pressure of the first battery pack and the total pressure of the second battery pack, and when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set first differential pressure threshold value, the main control module sends a reference voltage command to reduce the current between the first battery pack and the second battery pack to 80% of an initial value; when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set second differential pressure threshold value, reducing the current between the first battery pack and the second battery pack to 60% of the initial value by sending a reference voltage instruction; when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set third pressure difference threshold value, the current between the first battery pack and the second battery pack is reduced to 40% of the initial value by sending a reference voltage instruction until the total pressure of the first battery pack is the same as the total pressure of the second battery pack, and charging and discharging between the first battery pack and the second battery pack are completed.
The positive pole of the first battery pack is connected with the positive pole of the second battery pack through a relay K3, and the first battery pack and the second battery pack are connected in parallel and then are connected with a load or a charger through a relay K4.
The first battery pack and the second battery pack which are connected in parallel with the main control module discharge to the load, or the charger charges the first battery pack and the second battery pack which are connected in parallel with each other.
The first battery pack, the second battery pack 2 and the load or charger are grounded.
After the charging and discharging between the first battery pack and the second battery pack are completed, the main control module controls the relay K3 to be switched on, the switch tube K1 and the switch tube K2 to be switched off, and the relay K4 to be switched on after receiving a communication command of a load or a battery charger, so that the discharging to the load is realized, or the battery charger charges the battery pack.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (9)
1. A parallel control device of a lithium ion battery pack is characterized in that: the system comprises a first battery pack monitoring module, a second battery pack monitoring module, a main control module, a closed-loop feedback module and a power switch module;
a first battery pack monitoring module: the system comprises a main control module, a first battery pack, a second battery pack, a first battery pack, a second battery pack, a third battery pack, a fourth battery pack, a fifth battery pack, a sixth battery pack, a fifth battery pack, a sixth battery pack, a fifth battery pack, a sixth battery pack, a fourth battery pack;
a second battery pack monitoring module: the system comprises a main control module, a first battery pack, a second battery pack, a first battery pack and a second battery pack, wherein the main control module is used for sampling the total pressure of the second battery pack, the current between the first battery pack and the second battery pack and the temperature of each monitoring node in the second battery pack and transmitting the total pressure, the current and the temperature to the main control module in a bus communication mode;
a main control module: comparing the total pressure of the first battery pack and the total pressure of the second battery pack, and sending a reference voltage instruction to a closed-loop feedback module;
a closed loop feedback module: regulating the voltage output to the power switch module according to the reference voltage and the feedback voltage by combining a zero pole compensation network;
a power switch module: and adjusting the charging current between the first battery pack and the second battery pack according to the voltage output by the closed-loop feedback module.
2. The parallel control device of lithium ion battery pack according to claim 1, wherein: the closed-loop feedback module comprises a first operational amplifier unit, a second operational amplifier unit, a feedback resistor R1, a feedback resistor R2, a first pole-zero compensation network and a second pole-zero compensation network;
the main control module is provided with two paths of outputs, the first path of output is connected to the equidirectional input end of the first operational amplifier unit, the second path of output is connected to the equidirectional input end of the second operational amplifier unit, one end of the feedback resistor R1 is connected to the reverse input end of the first operational amplifier unit, and the other end of the feedback resistor R1 is connected with the positive output end of the first battery pack; one end of the feedback resistor R2 is connected to the reverse input end of the second operational amplifier unit, and the other end of the feedback resistor R2 is connected to the positive output end of the second battery pack;
the first pole-zero compensation network is formed by connecting a resistor R3 and a capacitor C1 in parallel, is connected between the reverse input end and the output end of the first operational amplifier unit and provides pole-zero compensation for the closed-loop feedback module;
the second pole-zero compensation network is formed by connecting a resistor R4 and a capacitor C2 in parallel, is connected between the reverse input end and the output end of the second operational amplifier unit and provides pole-zero compensation for the closed-loop feedback module;
the ground of the first operational amplifier unit is connected to the anode of the first battery pack, and the ground of the second operational amplifier unit is connected to the anode of the second battery pack.
3. The parallel control device of lithium ion battery pack according to claim 2, wherein: when the total pressure of the second battery pack is greater than that of the first battery pack, the first output of the main control module is the maximum charging current R1 which can be accepted by the first battery pack, and the second output is 0;
when the total pressure of the first battery pack is greater than that of the second battery pack, the second output of the main control module is the maximum charging current R2 which can be received by the second battery pack, and the first output is 0.
4. The parallel control device of lithium ion battery pack as claimed in claim 3, wherein: a first fuse is provided between the positive electrode of the first battery pack and the resistor R1, and a second fuse is provided between the positive electrode of the second battery pack and the resistor R2.
5. The parallel control device of lithium ion battery pack according to claim 3 or 4, wherein: the power switch module comprises a switch tube K1 and a switch tube K2;
the grid of switch tube K1 is connected to the output of first fortune unit of putting, and the grid of switch tube K2 is connected to the output of second fortune unit of putting, and the source electrode of switch tube K1 is connected with the reverse input end of first fortune unit of putting, and the drain electrode of switch tube K1 is connected with the drain electrode of switch tube K2, and the source electrode of switch tube K2 is connected with the reverse input end of second fortune unit of putting.
6. The parallel control device of lithium ion battery pack as claimed in claim 5, wherein: the first battery pack monitoring module, the second battery pack monitoring module and the main control module are connected to a bus in a hanging mode in a communication mode, and a data transmission function can be achieved.
7. The parallel control device of lithium ion battery pack as claimed in claim 6, wherein: the positive electrode of the first battery pack is connected with the positive electrode of the second battery pack through a relay K3, and the first battery pack and the second battery pack are connected in parallel and then are connected with a load or a charger through a relay K4;
after charging and discharging between the first battery pack and the second battery pack are completed, the main control module controls the relay K3 to be switched on, the switch tube K1 and the switch tube K2 to be switched off, the relay K4 is switched on, the first battery pack and the second battery pack which are connected in parallel discharge to a load, or the charger charges the first battery pack and the second battery pack which are connected in parallel.
8. The parallel control device of lithium ion battery pack according to claim 7, wherein: the first battery pack, the second battery pack 2 and the load or charger are grounded.
9. The parallel control device of lithium ion battery pack as claimed in claim 6, wherein:
the main control module adopts a step current reduction mechanism, and the realization method is as follows:
the main control module receives the total pressure of the first battery pack and the total pressure of the second battery pack, and when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set first differential pressure threshold value, the main control module sends a reference voltage command to reduce the current between the first battery pack and the second battery pack to 80% of an initial value; when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set second differential pressure threshold value, reducing the current between the first battery pack and the second battery pack to 60% of the initial value by sending a reference voltage instruction; when the difference value between the total pressure of the first battery pack and the total pressure of the second battery pack is smaller than a set third pressure difference threshold value, the current between the first battery pack and the second battery pack is reduced to 40% of the initial value by sending a reference voltage instruction until the total pressure of the first battery pack is the same as the total pressure of the second battery pack, and charging and discharging between the first battery pack and the second battery pack are completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712054.0A CN113629796A (en) | 2021-06-25 | 2021-06-25 | Parallel control device of lithium ion battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110712054.0A CN113629796A (en) | 2021-06-25 | 2021-06-25 | Parallel control device of lithium ion battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113629796A true CN113629796A (en) | 2021-11-09 |
Family
ID=78378427
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110712054.0A Pending CN113629796A (en) | 2021-06-25 | 2021-06-25 | Parallel control device of lithium ion battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113629796A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5600247A (en) * | 1992-07-08 | 1997-02-04 | Benchmarq Microelectronics | Dynamically balanced fully differential circuit for use with a battery monitoring circuit |
| EP2186181A2 (en) * | 2007-07-26 | 2010-05-19 | LG Chem, Ltd. | Apparatus and method for balancing of battery cell's charge capacity |
| WO2013008408A1 (en) * | 2011-07-08 | 2013-01-17 | Ｎｅｃエナジーデバイス株式会社 | Charging control system, battery pack and charging method |
| CN104348194A (en) * | 2013-07-26 | 2015-02-11 | 无锡华润矽科微电子有限公司 | Electric vehicle charging control circuit and calibration method thereof |
| CN106394300A (en) * | 2016-11-10 | 2017-02-15 | 航天重型工程装备有限公司 | Power management system |
| CN108233459A (en) * | 2016-12-15 | 2018-06-29 | 现代自动车株式会社 | Battery system and its control method |
-
2021
- 2021-06-25 CN CN202110712054.0A patent/CN113629796A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5600247A (en) * | 1992-07-08 | 1997-02-04 | Benchmarq Microelectronics | Dynamically balanced fully differential circuit for use with a battery monitoring circuit |
| EP2186181A2 (en) * | 2007-07-26 | 2010-05-19 | LG Chem, Ltd. | Apparatus and method for balancing of battery cell's charge capacity |
| WO2013008408A1 (en) * | 2011-07-08 | 2013-01-17 | Ｎｅｃエナジーデバイス株式会社 | Charging control system, battery pack and charging method |
| CN104348194A (en) * | 2013-07-26 | 2015-02-11 | 无锡华润矽科微电子有限公司 | Electric vehicle charging control circuit and calibration method thereof |
| CN106394300A (en) * | 2016-11-10 | 2017-02-15 | 航天重型工程装备有限公司 | Power management system |
| CN108233459A (en) * | 2016-12-15 | 2018-06-29 | 现代自动车株式会社 | Battery system and its control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104600799B (en) | A kind of series battery equalizing circuit and equalization methods | |
| CN103560548B (en) | Battery pack, battery connection system and battery set charge/discharge management method | |
| CN102969755B (en) | Circuit and system for intelligent management of battery pack | |
| CN102957173B (en) | Multi-cell serially-connected lithium battery pack equalization and protection system | |
| CN201290020Y (en) | Voltage equalizing charge circuit for lithium battery set | |
| CN105098933A (en) | Battery monomer acquisition detection device | |
| CN110571883A (en) | Lithium battery charging current limiting system | |
| CN107040021A (en) | A kind of battery modules series connection management circuit | |
| CN213906363U (en) | Battery series connection charging and discharging circuit | |
| CN211239354U (en) | Main loop control circuit of energy storage equipment | |
| CN112072734A (en) | Equalization system and method for liquid metal battery pack | |
| CN106329594B (en) | Device and method for limiting current during charging of battery of energy storage system | |
| CN113629796A (en) | Parallel control device of lithium ion battery pack | |
| CN105244926A (en) | Lithium-ion power battery pack equalization charging system | |
| CN102957175B (en) | Multi-cell serially-connected lithium battery pack equalization and protection system | |
| CN215496993U (en) | General series-parallel connection architecture of lithium battery pack | |
| CN112886078B (en) | Lithium battery pack series connection balance control device and method | |
| CN114336828A (en) | Balanced management method of string battery energy storage system linked with PCS (personal communications System) | |
| CN210608594U (en) | Battery and active equalization module | |
| CN114497906A (en) | Anti-reverse device, battery cluster and battery module thereof | |
| CN111697666A (en) | Equalizing charging circuit and equalizing method | |
| CN113437442A (en) | General series-parallel connection architecture of lithium battery pack | |
| CN102969754B (en) | Storage battery pack connection circuit and intelligent storage battery pack | |
| CN207097994U (en) | Combined storage battery device | |
| CN203104045U (en) | Main circuit of solar charging controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |