CN113364091B - Space lithium battery autonomous balance control system - Google Patents
Space lithium battery autonomous balance control system Download PDFInfo
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- CN113364091B CN113364091B CN202110632124.1A CN202110632124A CN113364091B CN 113364091 B CN113364091 B CN 113364091B CN 202110632124 A CN202110632124 A CN 202110632124A CN 113364091 B CN113364091 B CN 113364091B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a 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
Abstract
The invention discloses an autonomous balance control system for a space lithium battery, which comprises: the single voltage sampling circuit is used for carrying out differential sampling on the single storage battery; the single voltage eliminating circuit judges the single voltage, if the single voltage is lower than a preset value, the single voltage is not output and does not participate in control; the minimum voltage selection circuit compares all the monomer voltages of the storage battery pack and selects the minimum monomer voltage to output; the reference voltage circuit outputs two paths of reference voltages respectively; the balancing logic circuit compares each single voltage of the storage battery with the minimum single voltage and performs balancing control on the corresponding single according to the difference value; and the circuit is an equalizing switch of the single battery. The invention adopts the hardware analog circuit to realize the autonomous balance control without the participation of lower computer software, thereby saving the lower computer resources; the control logic is simple, easy to realize and high in reliability.
Description
Technical Field
The invention relates to the technical field of satellite power supplies, in particular to a space lithium battery equalization control system.
Background
In recent years, with the on-orbit wide application of lithium ion storage batteries, the lithium ion storage batteries as space energy storage devices have put high requirements on the service life and reliability of the storage batteries, and on-orbit management of the storage batteries is particularly important, including battery balance management. The storage battery monomers are balanced, so that gradual differentiation among the monomers can be effectively avoided, and the deviation of the lithium ion storage battery monomers is kept within an expected deviation range. At present, most of domestic satellite lithium battery balance control needs to be realized by means of software algorithms, lower computer resources are occupied, and reliability of on-orbit application is not high.
Disclosure of Invention
In order to solve the technical problem, the invention provides an autonomous balance control system of a space lithium battery, which adopts a hardware analog circuit to sample the voltage of a single battery, each section of the voltage of the single battery is compared with the minimum voltage of the single battery, and when the difference value is less than 60mV, the single battery is unbalanced; when the voltage of a certain single battery is higher than the minimum single voltage and the difference value is more than 60mV, starting the balancing of the single battery until the difference value between the voltage of the single battery and the minimum single voltage is less than 10mV, and stopping the balancing of the single battery.
Specifically, the invention provides an autonomous balance control system for a space lithium battery, which is characterized by comprising the following components: the single voltage sampling circuit is used for carrying out differential sampling on the single storage battery; the single voltage eliminating circuit judges the single voltage, if the single voltage is lower than a preset value, the single voltage is not output and does not participate in control; the minimum voltage selection circuit compares all the single voltages of the storage battery pack and selects the minimum single voltage to output; the reference voltage circuit outputs two paths of reference voltages respectively; the balancing logic circuit compares each single voltage of the storage battery with the minimum single voltage and performs balancing control on the corresponding single according to the difference value; and the circuit is an equalizing switch of the single battery.
The cell voltage sampling circuit collects the cell voltages of the storage battery, the cell voltages below 3.3V are automatically rejected and do not participate in balance control, the cell voltages of the storage battery are output through the minimum voltage selection circuit, the balance logic circuit compares the cell voltages with the minimum cell voltage, corresponding cells are not balanced when the voltage difference value of each cell in the storage battery relative to the minimum cell voltage is lower than 60mV, corresponding cells are balanced when the voltage difference value of each cell in the storage battery relative to the minimum cell voltage is higher than 60mV, and the balance of the corresponding cells is stopped until the difference value between the cell voltages and the minimum cell voltage is smaller than 10 mV.
Further, the single voltage sampling circuit comprises resistors R1, R2, R3 and R4 and an operational amplifier U1 with the model number of AD 620; the positive end of the monomer is grounded through the resistors R1 and R4 in a voltage division manner; the negative end of the monomer is grounded through partial pressure by resistors R2 and R3 in sequence; the voltage division ends of the resistors R1 and R4 are connected with the positive input end of the operational amplifier U1; the voltage dividing ends of the resistors R2 and R3 are connected with the reverse input end of the operational amplifier U1; the output end of the operational amplifier U1 is the single voltage Vc.
Further, the reference voltage circuit comprises resistors R5, R6, R7, R8, R9 and a zener diode D1; one end of the resistor R5 is connected with a Vcc power supply, and the other end of the resistor R5 is respectively connected with one end of the resistor R6, one end of the resistor R8 and the cathode of the voltage stabilizing diode D1; the other end of the resistor R6 is a reference voltage V1, and the reference voltage V1 is connected with one end of a resistor R7; the other end of the resistor R8 is a reference voltage V2, and the reference voltage V2 is connected with one end of a resistor R9; the resistor R7, the resistor R9 and the anode of the voltage stabilizing tube D1 are all grounded.
Further, the monomer voltage eliminating circuit comprises a resistor R10, a diode D2, a diode D3, a comparator U2 and an operational amplifier U3; one end of a resistor R10 is connected with a Vcc power supply, and the other end of the resistor R10 is connected with the output end of a comparator U2 and the anode of a diode D2; the reference voltage V1 is connected with the positive input end of the comparator; the single voltage Vc is respectively connected with the reverse input end of the comparator U2 and the forward input end of the operational amplifier U3; the output end of the operational amplifier U3 is connected with the anode of the diode D3; the cathode output of the diode D3 is the eliminated monomer voltage Vm, and the cathode output of the diode D3 is connected with the cathode of the diode D2 and the reverse input end of the operational amplifier U3 respectively.
Further, the minimum voltage selection circuit comprises a resistor R11 and a small circuit 1-a small circuit n, one end of the resistor R11 is connected with a Vcc power supply, and the other end of the resistor R11 is a minimum monomer voltage Vmin which is respectively connected with output ends of the small circuit 1-the small circuit n; get small circuit and include: taking a small circuit 1-a small circuit n, wherein the small circuit 1 comprises an operational amplifier U3 and a diode D4, the eliminated monomer voltage Vm1 is connected with the reverse input end of the operational amplifier U3, the output end of the operational amplifier U3 is connected with the cathode of the diode D4, and the anode of the diode D4 is connected with the reverse input end of the operational amplifier U3 and the other end of the resistor R11; the structures of the small circuit 1 to the small circuit n are consistent.
Further, the equalization logic circuit comprises a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a voltage stabilizing diode D6, an operational amplifier U5 and a comparator U6; one end of the resistor R12 is connected with the monomer voltage, and the other end of the resistor R12 is respectively connected with one end of the resistor R14 and the positive input end of the operational amplifier U5; the other end of the resistor R14 is grounded; one end of the resistor R13 is connected with the minimum monomer voltage Vmin, the other end of the resistor R13 is connected with one end of the resistor R15 and the reverse input end of the operational amplifier U5, and the other end of the resistor R15 is connected with the output end of the operational amplifier U5 and one end of the resistor R16 respectively; the other end of the resistor R16 is respectively connected with one end of the resistor R17 and the positive input end of the comparator U6; the reverse input end of the comparator U6 is connected with the reference voltage V2, and the output end of the comparator U6 is respectively connected with one end of the resistor R17, one end of the resistor R18, one end of the resistor R19 and the cathode of the voltage stabilizing diode D6; the other end of the resistor R18 is connected with a Vcc power supply; the anode of the voltage stabilizing diode D6 is grounded; the other end of the resistor R19 is a control signal.
Further, the balanced shunt circuit comprises a triode Q1, a triode Q2, a resistor R20 and a resistor R21; a base B of the triode Q1 is connected with a control signal, an emitter E of the triode Q1 is grounded, and a collector C of the triode Q1 is connected with one end of the resistor R20; the other end of the resistor R20 is connected with a base electrode B of the triode Q2; an emitter E of the triode Q2 is connected with the positive end of the single battery, and a collector C of the triode Q2 is connected with one end of the resistor R21; the other end of the resistor R21 is connected to the negative terminal of the battery cell.
Furthermore, the models of the voltage-stabilizing tubes D1 and D6 are 2DW15A, the voltage temperature coefficients of the voltage-stabilizing tubes D1 and D6 are less than 5 multiplied by 10 < -6 >/DEG C, and the maximum drift amount of the voltage-stabilizing value is 6mV within the interval of minus 55 ℃ to 100 ℃.
Further, the triode Q1 is an NPN-type triode, and the triode Q2 is a PNP-type triode.
Through the technical scheme, the invention has the following advantages:
1. according to the invention, the hardware analog circuit is adopted to realize autonomous balance control, and lower computer software is not required to participate in control, so that lower computer resources are saved;
2. the invention has simple control logic, easy realization and high reliability, and is particularly suitable for space lithium battery equalization equipment.
Drawings
Fig. 1 is a schematic block diagram of an autonomous equalization control system for a space lithium battery according to the present invention;
fig. 2 is a control strategy of the autonomous balance control system for a space lithium battery provided by the invention;
fig. 3 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying a single voltage sampling circuit;
fig. 4 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying a reference voltage circuit;
fig. 5 is a local circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying a cell voltage rejection circuit;
fig. 6 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying a minimum voltage selection circuit;
fig. 7 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying an equalization logic circuit;
fig. 8 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying an equalization shunt circuit.
Detailed Description
The following further describes an embodiment of the present invention with reference to the attached drawings.
The invention provides an autonomous balance control system for a space lithium battery, which adopts a hardware analog circuit to sample the voltage of a single storage battery, compares the voltage of each section of the single storage battery with the minimum voltage of the single storage battery, and unbalance the single storage battery when the difference value is less than 60 mV; when the voltage of a certain single battery is higher than the minimum single voltage and the difference value is more than 60mV, starting the balancing of the single battery until the difference value between the voltage of the single battery and the minimum single voltage is less than 10mV, and stopping the balancing of the single battery.
The space lithium battery autonomous balance control system disclosed by the invention realizes hardware autonomous balance control on the single body, and the balance mode is resistance on-off balance.
Fig. 1 is a schematic block diagram of an autonomous equalization control system for a spatial lithium battery according to the present invention. As shown in fig. 1, the autonomous equalization control system for a spatial lithium battery of the present invention employs: the single voltage sampling circuit is used for carrying out differential sampling on the single storage battery; the single voltage eliminating circuit judges the single voltage, if the single voltage is lower than a preset value, the single voltage is not output and does not participate in control; the minimum voltage selection circuit compares all the single voltages of the storage battery pack and selects the minimum single voltage to output; the reference voltage circuit outputs two paths of reference voltages respectively; the balancing logic circuit compares each single voltage of the storage battery with the minimum single voltage and performs balancing control on the corresponding single according to the difference value; and the circuit is an equalizing switch of the single battery.
The space lithium battery autonomous balance control system provided by the invention can realize a hardware autonomous balance function.
Fig. 2 is a control strategy of the autonomous balance control system for the space lithium battery provided by the invention. As shown in fig. 2, according to the difference between the voltage Vc of the single battery and the minimum voltage Vmin of the battery pack, the independent equalization control is performed on the corresponding single battery. The balancing method comprises the following steps: when the voltage difference of the monomers is less than 60mV, the monomers are unbalanced; and when the difference is more than 60mV, starting monomer equalization, and stopping monomer equalization until the difference is less than 10 mV. The threshold value of the balanced on and off can be adjusted by debugging the corresponding debugging bit according to the actual needs of the product.
Therefore, in the space lithium battery autonomous equalization control system, the monomer voltage sampling circuit collects each monomer voltage of the storage battery, the monomer voltage lower than 3.3V is automatically removed and does not participate in equalization control, the minimum monomer voltage output of each monomer voltage of the storage battery is realized through the minimum voltage selection circuit, the equalization logic circuit compares each monomer voltage with the minimum monomer voltage, when the voltage difference value of each monomer battery in the storage battery is lower than 60mV relative to the minimum monomer voltage difference value, the corresponding monomer is not equalized, when the voltage difference value of each monomer battery in the storage battery is higher than 60mV relative to the minimum monomer voltage difference value, the corresponding monomer is equalized until the difference value between the monomer voltage and the minimum monomer voltage is smaller than 10mV, and the equalization of the monomer is stopped.
The specific circuit of the autonomous balance control system for the space lithium battery is shown in fig. 3-8.
Fig. 3 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying a single voltage sampling circuit. As shown in fig. 3, the single voltage sampling circuit of the present invention includes resistors R1, R2, R3, R4 and an operational amplifier U1 with model AD 620; the positive end of the monomer is grounded through the resistors R1 and R4 in sequence; the negative end of the monomer is grounded through resistors R2 and R3 in sequence; the resistors R1 and R4 are both connected with the positive input end of the operational amplifier U1; the resistors R2 and R3 are both connected with the reverse input end of the operational amplifier U1; the output end of the operational amplifier U1 is the single voltage Vc.
The single voltage sampling circuit provided by the invention is used for collecting the single voltage of the storage battery, a differential sampling mode is adopted, the differential sampling resistor adopts an RJK53 resistor, the model of an operational amplifier is AD620, and the sampling precision of the single voltage can be effectively improved.
Fig. 4 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying a reference voltage circuit. As shown in fig. 4, the reference voltage circuit of the present invention includes resistors R5, R6, R7, R8, R9 and a zener diode D1; one end of the resistor R5 is connected with a Vcc power supply, and the other end of the resistor R5 is respectively connected with one end of the resistor R6, one end of the resistor R8 and the cathode of the voltage stabilizing diode D1; the other end of the resistor R6 is a reference voltage V1, and the reference voltage V1 is connected with one end of the resistor R7; the other end of the resistor R8 is a reference voltage V2, and the reference voltage V2 is connected with one end of a resistor R9; the anode of the resistor R7, the anode of the resistor R9 and the anode of the voltage regulator tube D1 are all grounded.
The voltage reference circuit adopts a +12V power supply for power supply, firstly obtains stable voltage through a voltage stabilizing tube D1, then divides the voltage through a series resistor, and outputs two paths of reference voltages V1 and V2. The model of the voltage stabilizing tube D1 is 2DW15A, the voltage temperature coefficient of the voltage stabilizing tube is less than 5 multiplied by 10 < -6 >/DEG C, the maximum drift amount of the voltage stabilizing value is 6mV within the interval of minus 55 ℃ to 100 ℃, and the temperature drift influence can be effectively reduced.
Fig. 5 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying a cell voltage eliminating circuit. As shown in fig. 5, the single voltage eliminating circuit of the present invention includes a resistor R10, a diode D2, a diode D3, a comparator U2, and an operational amplifier U3; one end of the resistor R10 is connected with a Vcc power supply, and the other end of the resistor R10 is connected with the output end of the comparator U2 and the anode of the diode D2; the reference voltage V1 is connected with the positive input end of the comparator; the single voltage Vc is respectively connected with the reverse input end of the comparator U2 and the forward input end of the operational amplifier U3; the output end of the operational amplifier U3 is connected with the anode of the diode D3; the cathode output of the diode D3 is the monomer voltage Vm after elimination, and is respectively connected with the cathode of the diode D2 and the reverse input end of the operational amplifier U3.
The monomer voltage rejection circuit judges the magnitude of each monomer voltage, the overlow monomer voltage is rejected without participating in control, the comparator U2 compares the monomer voltage Vc with a reference voltage V1, the operational amplifier U3 outputs the monomer voltage Vc in a following manner, the diodes D2 and D3 are connected in parallel to form a large-gain logic circuit, the output of the comparator U2 is compared with the output of the operational amplifier U3, a larger value is obtained for output, when the monomer voltage Vc is larger than the reference voltage V1, the comparator U2 outputs a low-level voltage (less than 0.5V), the monomer voltage rejection circuit outputs the monomer voltage Vc, when the monomer voltage Vc is smaller than the reference voltage V1, the comparator U2 outputs a high-level voltage (more than 10V), and the monomer voltage rejection circuit outputs a high-level voltage (more than 10V).
Fig. 6 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying a minimum voltage selection circuit. As shown in fig. 6, the minimum voltage selection circuit of the present invention includes a resistor R11, and a small circuit 1 to a small circuit n, wherein one end of the resistor R11 is connected to a Vcc power supply, and the other end of the resistor R11 is a minimum individual voltage Vmin, which is respectively connected to output terminals of the small circuit 1 to the small circuit n; get small circuit and include: taking a small circuit 1 to a small circuit n, wherein the small circuit 1 comprises an operational amplifier U3 and a diode D4, the eliminated monomer voltage Vm1 is connected with the forward input end of the operational amplifier U3, the output end of the operational amplifier U3 is connected with the cathode of the diode D4, and the anode of the diode D4 is connected with the reverse input end of the operational amplifier U3 and the other end of the resistor R11; the structures of the small circuit 1 to the small circuit n are consistent.
The minimum voltage selection circuit compares the voltages of all the monomers of the storage battery pack, the minimum monomer voltage value is selected to be output, the output end of the operational amplifier is connected with the backward diode in series in the small circuit, the n small circuits respectively correspond to n sections of monomer voltages, the operational amplifier with small offset voltage is selected, and the output of the minimum monomer voltage value can be accurately realized.
Fig. 7 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying an equalization logic circuit. As shown in fig. 7, the equalizing logic circuit of the present invention includes a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a zener diode D6, an operational amplifier U5, and a comparator U6; one end of the resistor R12 is connected with the monomer voltage, and the other end of the resistor R12 is respectively connected with one end of the resistor R14 and the positive input end of the operational amplifier U5; the other end of the resistor R14 is grounded; one end of the resistor R13 is connected with the minimum cell voltage Vmin, the other end of the resistor R13 is connected with one end of the resistor R15 and the reverse input end of the operational amplifier U5, and the other end of the resistor R15 is connected with the output end of the operational amplifier U5 and one end of the resistor R16 respectively; the other end of the resistor R16 is connected with one end of a resistor R17 and the positive input end of the comparator U6 respectively; the reverse input end of the comparator U6 is connected with the reference voltage V2, and the output end of the comparator U6 is respectively connected with one end of the resistor R17, one end of the resistor R18, one end of the resistor R19 and the cathode of the voltage stabilizing diode D6; the other end of the resistor R18 is connected with a Vcc power supply; the anode of the voltage-stabilizing diode D6 is grounded; the other end of the resistor R19 is a control signal.
The balancing logic circuit of the invention realizes the balancing switch control of the single battery, the operational amplifier U5 performs subtraction operation on the single voltage and the minimum single voltage of the storage battery pack, the operational amplifier U5 outputs an error amplification value (k & ltdelta & gt V) of the single voltage and the minimum single voltage, k is a proportional amplification coefficient, and the error amplification value (k & ltdelta & gt V) and a reference voltage V2 form hysteresis comparison logic through a comparator U6. The logic is: when k × Δ V is smaller than V2 (at this time, the deviation between the corresponding cell voltage and the minimum cell voltage is smaller than 60 mV), the comparator U6 outputs a low-level voltage signal, and the balanced state is balanced off; when k × Δ V is greater than V2 (at this time, the deviation between the corresponding cell voltage and the minimum cell voltage is greater than 60 mV), the comparator U6 outputs a high-level voltage signal, and the balanced state is balanced; until k × Δ V decreases from a state greater than V2 to a preset value V3 (V3 is less than V2) (at this time, the deviation between the corresponding cell voltage and the minimum cell voltage is less than 10 mV), the comparator U6 outputs a low-level voltage signal, and at this time, the equilibrium state is changed from equilibrium on to equilibrium off. The high-level voltage signal output by the comparator U6 is the voltage stabilizing value Vz of the voltage stabilizing tube D6, the model of the voltage stabilizing tube D6 is 2DW15A, the voltage temperature coefficient of the voltage stabilizing tube is less than 5 multiplied by 10 < -6 >/DEG C, the maximum drift amount of the voltage stabilizing value is 6mV within the interval of minus 55 ℃ to 100 ℃, and the influence of parameter temperature drift can be effectively reduced. The preset value V3 is calculated by the formula: v3= (R16 + R17) × V2/R17-R16 × Vz/R17.
Fig. 8 is a partial circuit diagram of the autonomous equalization control system for a spatial lithium battery according to the present invention, which is mainly used for displaying an equalization shunt circuit. As shown in fig. 8, the equalizing and shunting circuit of the present invention includes a transistor Q1, a transistor Q2, a resistor R20, and a resistor R21; a base B of the triode Q1 is connected with a control signal, an emitter E of the triode Q1 is grounded, and a collector C of the triode Q1 is connected with one end of the resistor R20; the other end of the resistor R20 is connected with a base electrode B of the triode Q2; an emitter E of the triode Q2 is connected with the positive end of the single battery, and a collector C of the triode Q2 is connected with one end of the resistor R21; the other end of the resistor R21 is connected to the negative terminal of the battery cell.
The monomer balanced shunt circuit, triode Q1 are first order amplifier circuit, and triode Q2 is second order amplifier circuit, and triode Q1 accepts preceding stage balanced switch signal and carries out the switching action, and then drives triode Q2 switch, realizes monomer balanced shunt, and resistance R21 is the current limiting resistance, can realize balanced current size adjustment through the adjustment resistance value size.
The triode Q1 is an NPN type triode, and the triode Q2 is a PNP type triode.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make possible variations and modifications of the present invention using the method and the technical contents disclosed above without departing from the spirit and scope of the present invention, and therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are all within the scope of the present invention.
Claims (10)
1. The utility model provides a space lithium cell is balanced control system independently which characterized in that includes:
the single voltage sampling circuit is used for carrying out differential sampling on a single storage battery to obtain a single voltage Vc;
the single voltage rejection circuit judges the size of the single voltage, outputs the rejected single voltage Vm to the minimum voltage selection circuit, does not participate in control if the single voltage is lower than a reference voltage V1, specifically, outputs the single voltage Vc when the single voltage Vc is higher than the reference voltage V1, outputs a high-level voltage when the single voltage Vc is lower than the reference voltage V1, and comprises a resistor R10, a diode D2, a diode D3, a comparator U2 and an operational amplifier U3; one end of the resistor R10 is connected with a Vcc power supply, and the other end of the resistor R10 is connected with the output end of the comparator U2 and the anode of the diode D2; the reference voltage V1 is connected with the positive input end of the comparator; the single voltage Vc is respectively connected with the reverse input end of the comparator U2 and the forward input end of the operational amplifier U3; the output end of the operational amplifier U3 is connected with the anode of the diode D3; the cathode output of the diode D3 is the monomer voltage Vm after elimination, and is respectively connected with the cathode of the diode D2 and the reverse input end of the operational amplifier U3;
the minimum voltage selection circuit compares the eliminated monomer voltages Vm of all the monomers of the storage battery pack and selects the minimum monomer voltage to output to the balance logic circuit;
the reference voltage circuit outputs a reference voltage V1 to the monomer voltage eliminating circuit and outputs a reference voltage V2 to the balance logic circuit respectively;
the balancing logic circuit compares the voltage Vc of each single body of the storage battery with the minimum voltage of the single body, and performs balancing control on the corresponding single body according to the difference value and the reference voltage V2 to control the balancing state of the corresponding single body to be balanced on or balanced off;
the equalizing shunt circuit is an equalizing switch of the single battery to realize the equalizing shunt of the single battery,
the circuits are all hardware analog circuits.
2. The autonomous equalization control system for the spatial lithium battery according to claim 1, wherein the cell voltage sampling circuit collects the cell voltages of the storage battery, the cell voltages lower than 3.3V are automatically rejected without participating in equalization control, the cell voltages of the storage battery are output at the minimum cell voltage through the minimum voltage selection circuit, the equalization logic circuit compares the cell voltages with the minimum cell voltage, when the difference between the cell voltage of each cell in the storage battery and the minimum cell voltage is lower than 60mV, the corresponding cell is not equalized, when the difference between the cell voltage of each cell in the storage battery and the minimum cell voltage is higher than 60mV, the corresponding cell is equalized until the difference between the cell voltage and the minimum cell voltage is smaller than 10mV, and the equalization of the cell is stopped.
3. The autonomous balance control system for the space lithium battery as claimed in claim 1, wherein the single voltage sampling circuit comprises resistors R1, R2, R3, R4 and an operational amplifier U1 with model number AD 620; the positive end of the monomer is grounded through the resistors R1 and R4 in a voltage division manner; the negative end of the monomer is grounded through partial voltage of resistors R2 and R3 in sequence; the voltage dividing ends of the resistors R1 and R4 are connected with the positive input end of the operational amplifier U1; the voltage division ends of the resistors R2 and R3 are connected with the reverse input end of the operational amplifier U1; the output end of the operational amplifier U1 is the monomer voltage Vc.
4. The autonomous equalization control system for spatial lithium batteries according to claim 1, characterized in that said reference voltage circuit comprises resistors R5, R6, R7, R8, R9 and a zener diode D1; one end of the resistor R5 is connected with a Vcc power supply, and the other end of the resistor R5 is respectively connected with one end of the resistor R6, one end of the resistor R8 and the cathode of the voltage stabilizing diode D1; the other end of the resistor R6 is a reference voltage V1, and the reference voltage V1 is connected with one end of a resistor R7; the other end of the resistor R8 is a reference voltage V2, and the reference voltage V2 is connected with one end of a resistor R9; the resistor R7, the resistor R9 and the anode of the voltage stabilizing tube D1 are all grounded.
5. The space lithium battery autonomous equalization control system of claim 1, wherein the minimum voltage selection circuit comprises a resistor R11, a small taking circuit 1 to a small taking circuit n, one end of the resistor R11 is connected with a Vcc power supply, and the other end of the resistor R11 is a minimum single voltage Vmin which is respectively connected with the output ends of the small taking circuit 1 to the small taking circuit n; get small circuit and include: taking a small circuit 1-a small circuit n, wherein the small circuit 1 comprises an operational amplifier U3 and a diode D4, the eliminated monomer voltage Vm1 is connected with the reverse input end of the operational amplifier U4, the output end of the operational amplifier U4 is connected with the cathode of the diode D4, and the anode of the diode D4 is connected with the reverse input end of the operational amplifier U4 and the other end of the resistor R11; the structures of the small circuit 1 to the small circuit n are consistent.
6. The autonomous equalization control system for the space lithium battery according to claim 1, wherein the equalization logic circuit comprises a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a voltage stabilizing diode D6, an operational amplifier U5 and a comparator U6; one end of the resistor R12 is connected with the monomer voltage, and the other end of the resistor R12 is respectively connected with one end of the resistor R14 and the positive input end of the operational amplifier U5; the other end of the resistor R14 is grounded; one end of the resistor R13 is connected with the minimum monomer voltage Vmin, the other end of the resistor R13 is connected with one end of the resistor R15 and the reverse input end of the operational amplifier U5, and the other end of the resistor R15 is connected with the output end of the operational amplifier U5 and one end of the resistor R16 respectively; the other end of the resistor R16 is connected with one end of a resistor R17 and the positive input end of the comparator U6 respectively; the reverse input end of the comparator U6 is connected with the reference voltage V2, and the output end of the comparator U6 is respectively connected with the other end of the resistor R17, one end of the resistor R18, one end of the resistor R19 and the cathode of the voltage stabilizing diode D6; the other end of the resistor R18 is connected with a Vcc power supply; the anode of the voltage-stabilizing diode D6 is grounded; the other end of the resistor R19 is a control signal.
7. The autonomous balance control system for the space lithium battery as claimed in claim 1, wherein the balance shunt circuit comprises a triode Q1, a triode Q2, a resistor R20 and a resistor R21; a base B of the triode Q1 is connected with a control signal, an emitter E of the triode Q1 is grounded, and a collector C of the triode Q1 is connected with one end of the resistor R20; the other end of the resistor R20 is connected with a base B of the triode Q2; an emitter E of the triode Q2 is connected with the positive end of the single battery, and a collector C of the triode Q2 is connected with one end of the resistor R21; the other end of the resistor R21 is connected to the negative terminal of the battery cell.
8. The autonomous equalization control system for spatial lithium batteries according to claim 4, characterized in that said voltage regulator tube D1 is provided withThe model is 2DW15A, and the voltage temperature coefficient of the voltage-stabilizing tube D1 is less than 5 multiplied by 10 -6 The maximum drift amount of the pressure stabilizing value is 6mV within the range of minus 55 ℃ to 100 ℃.
9. The autonomous balance control system for space lithium batteries according to claim 6, characterized in that the model number of the voltage-regulator tube D6 is 2DW15A, and the voltage temperature coefficient of the voltage-regulator tube D6 is less than 5 x 10 -6 The maximum drift amount of the stabilized pressure value is 6mV within the range of minus 55 ℃ to 100 ℃.
10. The autonomous balance control system for spatial lithium batteries according to claim 7, wherein said transistor Q1 is an NPN-type transistor, and said transistor Q2 is a PNP-type transistor.
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