CN110752413B - Method, circuit and system for discharging battery - Google Patents
Method, circuit and system for discharging battery Download PDFInfo
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- CN110752413B CN110752413B CN201910858510.5A CN201910858510A CN110752413B CN 110752413 B CN110752413 B CN 110752413B CN 201910858510 A CN201910858510 A CN 201910858510A CN 110752413 B CN110752413 B CN 110752413B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- 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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Chemical & Material Sciences (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a method, a circuit and a system for discharging a battery. The method comprises the following steps: comparing the voltage of the battery with a first set voltage and a second set voltage respectively, wherein the second set voltage is smaller than the first set voltage; when the voltage of the battery is greater than the first set voltage, the battery is connected to a first discharging branch circuit for discharging; when the voltage of the battery is less than or equal to the first set voltage and the voltage of the battery is greater than the second set voltage, connecting the battery to a second discharging branch circuit for discharging, wherein the discharging current of the second discharging branch circuit is less than that of the first discharging branch circuit; and when the voltage of the battery is less than or equal to the second set voltage, the battery is simultaneously accessed into the first discharging branch and the second discharging branch for discharging. The invention can realize that the voltage of the battery can not be recovered within 40 to 60 minutes, and the battery can be safely disassembled within 1 hour.
Description
Technical Field
The invention relates to the field of battery recycling, in particular to a battery discharging method, circuit and system.
Background
With the popularization and support of new energy automobiles in China, electric automobiles enter a rapid development period, and the demand of automobile lithium batteries is rising year by year. However, the service life of lithium batteries is limited, so that the number of the retired lithium batteries is in the high trend. The waste lithium batteries pollute the environment, and the lithium batteries have scarce metal resources in China, so that the retired lithium batteries are usually recycled.
Before the lithium battery is recycled, the residual electric quantity (namely, residual electricity) of the lithium battery needs to be released below the safe voltage, so that dangerous conditions such as fire, explosion and the like in the disassembly process of the lithium battery are avoided, and meanwhile, the damage to recycling equipment is reduced. At present, the lithium battery is mainly soaked in chemical solutions such as sodium hydroxide, sodium chloride and the like for discharging, the whole process needs 12 to 16 hours, the time consumption is long, and the efficiency is low. If the residual capacity of the lithium battery is consumed by directly adopting the electric equipment, although the consumed time is short, the voltage of the lithium battery is easy to recover, and the discharging effect cannot be ensured.
Disclosure of Invention
The present invention is directed to a method, circuit and system for discharging remaining battery power to overcome the above-mentioned deficiencies in the prior art.
The technical scheme for solving the technical problems is as follows:
a method of discharging a battery, the method comprising:
comparing the voltage of the battery with a first set voltage and a second set voltage respectively, wherein the second set voltage is smaller than the first set voltage;
when the voltage of the battery is greater than the first set voltage, the battery is connected to a first discharging branch circuit for discharging;
when the voltage of the battery is less than or equal to the first set voltage and the voltage of the battery is greater than the second set voltage, connecting the battery to a second discharging branch circuit for discharging, wherein the discharging current of the second discharging branch circuit is less than that of the first discharging branch circuit;
and when the voltage of the battery is less than or equal to the second set voltage, the battery is simultaneously accessed into the first discharging branch and the second discharging branch for discharging.
The invention has the beneficial effects that: when the voltage of the battery is higher than a first set voltage, the battery is connected to a first discharging branch circuit for discharging, the current of the first discharging branch circuit is larger, the battery can be quickly discharged when the voltage is larger, and the overall discharging time of the battery is shortened; when the battery voltage is between a first set voltage and a second set voltage, the battery is connected to a second discharging branch circuit for discharging, the discharging current of the second discharging branch circuit is smaller than that of the first discharging branch circuit, the discharging mode can be changed after the battery is rapidly discharged, the temporary reduction of the battery voltage caused by the rapid release of the battery residual electricity is avoided, the sufficient release of the battery residual electricity is facilitated, and the recovery time of the battery voltage is delayed; when the battery voltage is below the second set voltage, the battery is simultaneously connected into the first discharging branch and the second discharging branch for discharging, the discharging mode can be changed again, and the battery can be discharged as comprehensively as possible when the voltage is small, so that the best discharging effect is achieved, and the safe disassembly of the battery is realized.
Further: the method further comprises the following steps:
and outputting the communication state of the battery, the first discharging branch and the second discharging branch.
The beneficial effects of the further scheme are as follows: the discharging condition of the battery can be known in time through the communication state of the output battery and the discharging branch circuit.
Further: the method further comprises the following steps:
when the battery is communicated with the first discharging branch and the second discharging branch, the battery is disconnected with the first discharging branch and the second discharging branch, so that the voltage of the battery is recovered;
comparing the voltage of the battery with the first set voltage, the second set voltage;
when the voltage of the battery is greater than the first set voltage, the battery is connected to a first discharging branch circuit for discharging;
when the voltage of the battery is less than or equal to the first set voltage and the voltage of the battery is greater than the second set voltage, the battery is connected to a second discharging branch circuit for discharging;
and when the voltage of the battery is less than or equal to the second set voltage, the battery is simultaneously accessed into the first discharging branch and the second discharging branch for discharging.
The beneficial effects of the further scheme are as follows: through disconnection and then communication, circulation of three discharging stages is realized, full discharging of the battery is facilitated, and safe disassembly is realized.
Further: and disconnecting the battery from the first discharging branch and the second discharging branch for 2-3 times.
The beneficial effects of the further scheme are as follows: the frequency of disconnecting the battery from the first discharging branch and the second discharging branch can be 2-3 times, the voltage of the battery is not recovered within 1-2 hours, and the battery can be safely disassembled.
Further: the method further comprises the following steps:
setting the first setting voltage and the second setting voltage.
The beneficial effects of the further scheme are as follows: the voltage is set according to actual needs, and different application scenes are met.
The technical scheme for solving the technical problems is as follows:
a circuit for discharging a battery, the circuit comprising:
the first discharging branch circuit is used for discharging the battery when the battery is connected into the first discharging branch circuit;
the second discharging branch is used for discharging the battery when the battery is connected into the second discharging branch; the discharge current of the second discharge branch circuit is smaller than that of the first discharge branch circuit;
the branch circuit selection unit is used for comparing the voltage of the battery with a first set voltage and a second set voltage respectively, wherein the second set voltage is smaller than the first set voltage; when the voltage of the battery is greater than the first set voltage, the battery is connected to a first discharging branch circuit for discharging; when the voltage of the battery is less than or equal to the first set voltage and the voltage of the battery is greater than the second set voltage, connecting the battery to a second discharging branch circuit for discharging, wherein the discharging current of the second discharging branch circuit is less than that of the first discharging branch circuit; and when the voltage of the battery is less than or equal to the second set voltage, the battery is simultaneously accessed into the first discharging branch and the second discharging branch for discharging.
The invention has the beneficial effects that: when the voltage of the battery is higher than a first set voltage, the battery is connected to a first discharging branch circuit for discharging, the current of the first discharging branch circuit is larger, the battery can be quickly discharged when the voltage is larger, and the overall discharging time of the battery is shortened; when the battery voltage is between a first set voltage and a second set voltage, the battery is connected to a second discharging branch circuit for discharging, the discharging current of the second discharging branch circuit is smaller than that of the first discharging branch circuit, the discharging mode can be changed after the battery is rapidly discharged, the temporary reduction of the battery voltage caused by the rapid release of the battery residual electricity is avoided, the sufficient release of the battery residual electricity is facilitated, and the recovery time of the battery voltage is delayed; when the battery voltage is below the second set voltage, the battery is simultaneously connected into the first discharging branch and the second discharging branch for discharging, the discharging mode can be changed again, and the battery can be discharged as comprehensively as possible when the voltage is small, so that the best discharging effect is achieved, and the safe disassembly of the battery is realized.
Further: the branch circuit selection unit comprises a first voltage comparator, a second voltage comparator and an exclusive-OR gate; the non-inverting input end of the first voltage comparator and the non-inverting input end of the second voltage comparator are used for being connected with the battery, the inverting input end of the first voltage comparator is used for inputting the first setting voltage, and the inverting input end of the second voltage comparator is used for inputting the second setting voltage; two input ends of the exclusive-OR gate are respectively connected with the output end of the first voltage comparator and the output end of the second voltage comparator, the output end of the exclusive-OR gate is connected with the first discharging branch, and the second discharging branch is connected with the output end of the first voltage comparator.
The beneficial effects of the further scheme are as follows: the branch selection unit is realized through devices such as a voltage comparator, an exclusive-OR gate, a switching triode and the like, peripheral circuit devices are reduced, the circuit is simple and efficient, the integration level is high, and the realization cost is low.
Further: the circuit further comprises:
a voltage providing unit for providing the first setting voltage and the second setting voltage;
the voltage providing unit comprises a first adjustable resistor R1 and a second adjustable resistor R2; the moving point of the first adjustable resistor R1 is connected with the inverting input end of the first voltage comparator, and two fixed points of the first adjustable resistor R1 are respectively used for being connected with a power supply and the ground; the moving point of the second adjustable resistor R2 is connected with the inverting input end of the second voltage comparator, and two fixed points of the second adjustable resistor R2 are respectively used for being connected with a power supply and the ground.
The beneficial effects of the further scheme are as follows: the resistance value of the adjustable resistor is adjusted, the set voltage is flexibly adjusted, and different discharging requirements can be met. And the circuit is simple, and the realization cost is low.
Further: the circuit further comprises:
a state display unit for displaying a discharge state of the battery;
the state display unit comprises a light emitting diode D, the anode of the light emitting diode D is respectively connected with the output end of the first voltage comparator and the output end of the second voltage comparator, and the cathode of the light emitting diode D is used for being grounded.
The beneficial effects of the further scheme are as follows: whether the discharging process is finished or not is conveniently and timely known through the brightness of the light-emitting diode. The circuit is simple, and the realization cost is low.
The technical scheme for solving the technical problems is as follows:
a system for discharging the residual electricity of a battery comprises the battery and the circuit.
The invention has the beneficial effects that: when the voltage of the battery is higher than a first set voltage, the battery is connected to a first discharging branch circuit for discharging, the current of the first discharging branch circuit is larger, the battery can be quickly discharged when the voltage is larger, and the overall discharging time of the battery is shortened; when the battery voltage is between a first set voltage and a second set voltage, the battery is connected to a second discharging branch circuit for discharging, the discharging current of the second discharging branch circuit is smaller than that of the first discharging branch circuit, the discharging mode can be changed after the battery is rapidly discharged, the temporary reduction of the battery voltage caused by the rapid release of the battery residual electricity is avoided, the sufficient release of the battery residual electricity is facilitated, and the recovery time of the battery voltage is delayed; when the battery voltage is below the second set voltage, the battery is simultaneously connected into the first discharging branch and the second discharging branch for discharging, the discharging mode can be changed again, and the battery can be discharged as comprehensively as possible when the voltage is small, so that the best discharging effect is achieved, and the safe disassembly of the battery is realized.
The technical scheme for solving the technical problems is as follows:
the invention has the beneficial effects that: when the voltage of the battery is higher than a first set voltage, the battery is connected to a first discharging branch circuit for discharging, the current of the first discharging branch circuit is larger, the battery can be quickly discharged when the voltage is larger, and the overall discharging time of the battery is shortened; when the battery voltage is between a first set voltage and a second set voltage, the battery is connected to a second discharging branch circuit for discharging, the discharging current of the second discharging branch circuit is smaller than that of the first discharging branch circuit, the discharging mode can be changed after the battery is rapidly discharged, the temporary reduction of the battery voltage caused by the rapid release of the battery residual electricity is avoided, the sufficient release of the battery residual electricity is facilitated, and the recovery time of the battery voltage is delayed; when the battery voltage is below the second set voltage, the battery is simultaneously connected into the first discharging branch and the second discharging branch for discharging, the discharging mode can be changed again, and the battery can be discharged as comprehensively as possible when the voltage is small, so that the best discharging effect is achieved, and the safe disassembly of the battery is realized.
Drawings
Fig. 1 is a flow chart of a method of discharging a battery according to the present invention.
FIG. 2 is a block diagram of the electrical schematic of a battery discharge circuit of the present invention;
FIG. 3 is a circuit diagram of a battery discharge circuit of the present invention:
FIG. 4 is a block diagram of a controller module according to the present invention;
FIG. 5 is a block diagram of the module of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a flow chart of a method of discharging a battery according to the present invention. As shown in fig. 1, a method of discharging a battery, comprising:
step S1: the voltage of the battery is compared with a first set voltage and a second set voltage respectively, and the second set voltage is smaller than the first set voltage. When the voltage of the battery is greater than the first set voltage, performing step S2; when the voltage of the battery is less than or equal to the first setting voltage and the voltage of the battery is greater than the second setting voltage, performing step S3; when the voltage of the battery is less than or equal to the second set voltage, step S4 is performed.
Step S2: and connecting the battery into the first discharging branch for discharging.
Step S3: and connecting the battery into a second discharging branch for discharging.
And the discharge current of the second discharge branch is smaller than that of the first discharge branch.
Step S4: and simultaneously connecting the battery into the first discharging branch and the second discharging branch for discharging.
When the voltage of the battery is higher than a first set voltage, the battery is connected to the first discharging branch circuit for discharging, the current of the first discharging branch circuit is larger, the battery can be quickly discharged when the voltage is larger, and the overall discharging time of the battery is shortened; when the battery voltage is between a first set voltage and a second set voltage, the battery is connected to a second discharging branch circuit for discharging, the discharging current of the second discharging branch circuit is smaller than that of the first discharging branch circuit, the discharging mode can be changed after the battery is rapidly discharged, the temporary reduction of the battery voltage caused by the rapid release of the battery residual electricity is avoided, the sufficient release of the battery residual electricity is facilitated, and the recovery time of the battery voltage is delayed; when the battery voltage is below the second set voltage, the battery is simultaneously connected into the first discharging branch and the second discharging branch for discharging, the discharging mode can be changed again, and the battery can be discharged as comprehensively as possible when the voltage is small, so that the best discharging effect is achieved, and the safe disassembly of the battery is realized.
Optionally, the method may further include:
and outputting the communication state of the battery, the first discharging branch and the second discharging branch.
The discharging condition of the battery can be known in time through the communication state of the output battery and the discharging branch circuit.
Further, the method may further include:
when the battery is communicated with the first discharging branch and the second discharging branch, the battery is disconnected with the first discharging branch and the second discharging branch, so that the voltage of the battery is recovered;
comparing the voltage of the battery with a first set voltage and a second set voltage;
when the voltage of the battery is greater than a first set voltage, the battery is connected to a first discharging branch circuit for discharging;
when the voltage of the battery is less than or equal to a first set voltage and the voltage of the battery is greater than a second set voltage, the battery is connected to a second discharging branch circuit for discharging;
and when the voltage of the battery is less than or equal to the second set voltage, the battery is connected to the first discharging branch and the second discharging branch simultaneously for discharging.
Through disconnection and then communication, circulation of three discharging stages is realized, full discharging of the battery is facilitated, and safe disassembly is realized.
For example, the number of times of disconnecting the battery from the first discharging branch and the second discharging branch can be 2-3 times, the voltage of the battery is not recovered within 1-2 hours, and the battery can be safely disassembled.
Optionally, the method may further include:
a first setting voltage and a second setting voltage are set.
The voltage is set according to actual needs, and different application scenes are met.
Illustratively, the voltage of the battery is 3.8V, the first set voltage may be 3V, and the second set voltage may be 1.5V.
Fig. 2 is an electrical schematic block diagram of a battery discharge circuit of the present invention. As shown in fig. 2, a circuit for discharging a battery includes:
the first discharging branch 10 is used for discharging the battery when the battery is connected to the first discharging branch 10;
the second discharging branch 20 is used for discharging the battery when the battery is connected to the second discharging branch 20; wherein, the discharge current of the second discharge branch 20 is smaller than the discharge current of the first discharge branch 10;
the branch circuit selection unit is used for comparing the voltage of the battery with a first set voltage and a second set voltage respectively, and the second set voltage is smaller than the first set voltage; when the voltage of the battery is greater than a first set voltage, the battery is connected to a first discharging branch circuit for discharging; when the voltage of the battery is less than or equal to a first set voltage and the voltage of the battery is greater than a second set voltage, the battery is connected to a second discharging branch circuit for discharging, and the discharging current of the second discharging branch circuit is less than that of the first discharging branch circuit; and when the voltage of the battery is less than or equal to the second set voltage, the battery is connected to the first discharging branch and the second discharging branch simultaneously for discharging.
Alternatively, as shown in fig. 2, the branch selecting unit may include a first voltage comparator 31, a second voltage comparator 32, and an exclusive or gate 33; a non-inverting input terminal of the first voltage comparator 31 and a non-inverting input terminal of the second voltage comparator 32 are used for being connected with the battery, an inverting input terminal of the first voltage comparator 31 is used for inputting a first setting voltage, and an inverting input terminal of the second voltage comparator 32 is used for inputting a second setting voltage; two input ends of the xor gate 33 are respectively connected to the output end of the first voltage comparator 31 and the output end of the second voltage comparator 32, the output end of the xor gate 33 is connected to the first discharging branch 10, and the second discharging branch 20 is connected to the output end of the first voltage comparator 31.
The branch selection unit is realized through the voltage comparator and the exclusive-OR gate, peripheral circuit devices are reduced, the circuit is simple and efficient, the integration level is high, and the realization cost is low.
Fig. 3 is a circuit diagram of a battery discharging circuit according to the present invention. As shown in fig. 3, in practical applications, the first voltage comparator 31 and the second voltage comparator 32 may be implemented by sharing one LM2903D, and the xor gate 33 may be implemented by using one NC7S 86. Further, an SMT0805 with a resistance of 1K (indicated by R11 and R12 in fig. 3) may be connected in series between the first voltage comparator 31 and the second voltage comparator 32, and the battery.
Further, as shown in fig. 3, the branch selecting unit may further include a first switching transistor Q1 and a second switching transistor Q2; a first switching transistor Q1 is connected in series between the output of the xor gate 33 and the first discharge branch 10, and a second switching transistor Q2 is connected in series between the second discharge branch 20 and the output of the first voltage comparator 31.
Specifically, a control terminal of the first switching transistor Q1 is connected to an output terminal of the xor gate 33, an input terminal of the first switching transistor Q1 is configured to be connected to a battery, and an output terminal of the first switching transistor Q1 is connected to the first discharging branch 10; a control terminal of the second switching transistor Q2 is connected to an output terminal of the first voltage comparator 31, an input terminal of the second switching transistor Q2 is adapted to be connected to a battery, and an output terminal of the second switching transistor Q2 is connected to the second discharging branch 20.
In practical applications, the first switching transistor Q1 and the second switching transistor Q2 may be implemented using NCE40P40A (i.e., SMT-TO-252), respectively.
Optionally, the circuit may further include:
and the voltage providing unit is used for providing a first setting voltage and a second setting voltage.
For example, as shown in fig. 3, the voltage supply unit may include a first adjustable resistor R1 and a second adjustable resistor R2; the moving point of the first adjustable resistor R1 is connected with the inverting input end of the first voltage comparator 31, and two fixed points of the first adjustable resistor R1 are respectively used for being connected with a power supply and the ground; the moving point of the second adjustable resistor R2 is connected to the inverting input of the second voltage comparator 32, and the two fixed points of the second adjustable resistor R2 are used for being connected to the power supply and the ground, respectively.
The resistance value of the adjustable resistor is adjusted, the set voltage is flexibly adjusted, and different discharging requirements can be met. And the circuit is simple, and the realization cost is low.
In practical applications, the first adjustable resistor R1 and the second adjustable resistor R2 may be implemented by using an SMT3836 with a maximum resistance value of 20K.
Optionally, the circuit may further include:
and the state display unit is used for displaying the discharge state of the battery.
Illustratively, as shown in fig. 3, the state display unit may include a light emitting diode D, an anode of the light emitting diode D is connected to the output terminal of the first voltage comparator 31 and the output terminal of the second voltage comparator 32, respectively, and a cathode of the light emitting diode D is used for grounding. Further, the state display unit may be connected to the first voltage comparator 31 and the second voltage comparator 32 by XH 2.54.
Whether the discharging process is finished or not is conveniently and timely known through the brightness of the light-emitting diode. The circuit is simple, and the realization cost is low.
Further, the state display unit may further include an electrolytic capacitor C1, a capacitor C2, and a resistor R; the resistor R is connected in series with the light emitting diode D and then connected in parallel with the electrolytic capacitor C1 and the capacitor C2, one end of the parallel circuit is connected with the output end of the first voltage comparator 31, the output end of the second voltage comparator 32 and the power supply, and the other end of the parallel circuit is grounded.
In practical application, the light emitting diode D can be realized by SMT0805-RED, the resistor R can be realized by SMT0805 with a resistance value of 220K, the capacitor C2 can be realized by SMT0805 with a capacitance value of 0.1 μ f, and the electrolytic capacitor C1 can be realized by SMT-8X 10 with a capacitance value of 470 μ f and a maximum voltage of 10V. Further, an SMT0805 (indicated by R21 and R22 in fig. 3) with a resistance of 220K may be connected in series between the first voltage comparator 31, the second voltage comparator 32 and the status display circuit.
Alternatively, as shown in fig. 3, the first discharging branch 10 may include a first resistor R1, and the second discharging branch 20 may include a second resistor R2, where the resistance of the second resistor R2 is greater than that of the first resistor R1. The first discharging branch circuit and the second discharging branch circuit are respectively realized through the two resistors with different resistance values, the realization is simple and convenient, and the cost is low.
In practical applications, the first discharging branch 10 and the second discharging branch 20 may also be implemented by other electric devices.
Further, the resistance of the second resistor R2 may be more than 30 times the resistance of the first resistor R1. The resistance values of the two resistors have larger difference, the resistor with large resistance value is beneficial to fully releasing the residual electricity of the battery, the resistor with small resistance value is beneficial to rapidly releasing the residual electricity of the battery, and the matching effect of the two resistors is better.
Preferably, the first resistor R1 may have a resistance of 0.215 Ω, and the second resistor R2 may have a resistance of 8 Ω. Experiments prove that the voltage of the battery can be reduced from 4.81V to 1.68V and maintained below 1.7V in one hour after four times of discharge (the first discharge branch is connected firstly and then the second discharge branch is connected for one time of discharge).
Illustratively, the material of the first resistor R1 and the second resistor R2 can be fire-resistant cement, and the material has good heat resistance, moisture resistance and heat dissipation performance and is low in price.
As shown in fig. 2, a system for discharging a battery includes a battery and a circuit for discharging the battery.
In practical applications, the plurality of batteries 100 and the plurality of circuits 200 may be connected in parallel and then connected in series. For example, four circuits 200 may be connected in parallel to form a controller module (as shown in fig. 4, the same terminal is connected), so that the discharge of four batteries 100 can be completed simultaneously. The intensification degree is high, conveniently monitors the electric current. The eight controller modules 300 are combined into a discharge module to complete the discharge of one battery module 400 (including 32 batteries) (as shown in fig. 5). High efficiency, low cost and easy realization of industrial application.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method of discharging a battery, the method comprising:
comparing the voltage of the battery with a first set voltage and a second set voltage respectively, wherein the second set voltage is smaller than the first set voltage;
when the voltage of the battery is greater than the first set voltage, the battery is connected to a first discharging branch circuit for discharging;
when the voltage of the battery is less than or equal to the first set voltage and the voltage of the battery is greater than the second set voltage, connecting the battery to a second discharging branch circuit for discharging, wherein the discharging current of the second discharging branch circuit is less than that of the first discharging branch circuit;
when the voltage of the battery is less than or equal to the second set voltage, the battery is simultaneously connected to the first discharging branch and the second discharging branch for discharging;
outputting the communication state of the battery, the first discharging branch and the second discharging branch;
when the battery is communicated with the first discharging branch and the second discharging branch, the battery is disconnected with the first discharging branch and the second discharging branch, so that the voltage of the battery is recovered;
and the circulation of three discharging stages is realized by disconnection and reconnection, and the frequency of disconnecting the battery from the first discharging branch and the second discharging branch is 2-3 times.
2. The method of claim 1, further comprising:
setting the first setting voltage and the second setting voltage.
3. A circuit for discharging a battery, the circuit being adapted to discharge the battery by the method of claim 1 or 2, the circuit comprising:
the first discharging branch (10) is used for discharging the battery when the battery is connected into the first discharging branch (10);
a second discharging branch (20) for discharging the battery when the battery is connected to the second discharging branch (20); wherein the discharge current of the second discharge branch (20) is smaller than that of the first discharge branch (10);
the branch circuit selection unit is used for comparing the voltage of the battery with a first set voltage and a second set voltage respectively, wherein the second set voltage is smaller than the first set voltage; when the voltage of the battery is greater than the first set voltage, the battery is connected to a first discharging branch circuit for discharging; when the voltage of the battery is less than or equal to the first set voltage and the voltage of the battery is greater than the second set voltage, connecting the battery to a second discharging branch circuit for discharging, wherein the discharging current of the second discharging branch circuit is less than that of the first discharging branch circuit; and when the voltage of the battery is less than or equal to the second set voltage, the battery is simultaneously accessed into the first discharging branch and the second discharging branch for discharging.
4. A circuit according to claim 3, characterized in that the branch selection unit comprises a first voltage comparator (31), a second voltage comparator (32), an exclusive or gate (33); the non-inverting input end of the first voltage comparator (31) and the non-inverting input end of the second voltage comparator (32) are used for being connected with the battery, the inverting input end of the first voltage comparator (31) is used for inputting the first setting voltage, and the inverting input end of the second voltage comparator (32) is used for inputting the second setting voltage; two input ends of the exclusive-OR gate (33) are respectively connected with the output end of the first voltage comparator (31) and the output end of the second voltage comparator (32), the output end of the exclusive-OR gate (33) is connected with the first discharging branch (10), and the second discharging branch (20) is connected with the output end of the first voltage comparator (31).
5. The circuit of claim 4, further comprising:
a voltage providing unit for providing the first setting voltage and the second setting voltage;
the voltage providing unit comprises a first adjustable resistor R1 and a second adjustable resistor R2; the moving point of the first adjustable resistor R1 is connected with the inverting input end of the first voltage comparator (31), and two fixed points of the first adjustable resistor R1 are respectively used for being connected with a power supply and a ground; the moving point of the second adjustable resistor R2 is connected with the inverting input end of the second voltage comparator (32), and two fixed points of the second adjustable resistor R2 are respectively used for being connected with a power supply and the ground.
6. The circuit of claim 4 or 5, further comprising:
a state display unit for displaying a discharge state of the battery;
the state display unit comprises a light emitting diode D, the anode of the light emitting diode D is respectively connected with the output end of the first voltage comparator (31) and the output end of the second voltage comparator (32), and the cathode of the light emitting diode D is used for being grounded.
7. A system for discharging the remaining power of a battery, the system comprising a battery and a circuit according to any one of claims 3 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910858510.5A CN110752413B (en) | 2019-09-11 | 2019-09-11 | Method, circuit and system for discharging battery |
Applications Claiming Priority (1)
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