CN117578676A - Dual-voltage charging circuit and method, dual-voltage lithium battery pack circuit and automobile - Google Patents

Dual-voltage charging circuit and method, dual-voltage lithium battery pack circuit and automobile Download PDF

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Publication number
CN117578676A
CN117578676A CN202311865923.9A CN202311865923A CN117578676A CN 117578676 A CN117578676 A CN 117578676A CN 202311865923 A CN202311865923 A CN 202311865923A CN 117578676 A CN117578676 A CN 117578676A
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CN
China
Prior art keywords
electrically connected
unit
charging
backflow prevention
positive
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
Application number
CN202311865923.9A
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Chinese (zh)
Inventor
鲍旭东
姚玉庆
范谦
施兴生
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Zhejiang Jujiang New Energy Technology Co ltd
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Zhejiang Jujiang New Energy Technology Co ltd
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Priority to CN202311865923.9A priority Critical patent/CN117578676A/en
Publication of CN117578676A publication Critical patent/CN117578676A/en
Pending legal-status Critical Current

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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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14—Preventing excessive discharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/15—Preventing overcharging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00308—Overvoltage 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00309—Overheat or overtemperature protection
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a double-voltage charging circuit, a double-voltage lithium battery pack circuit and an automobile, wherein the double-voltage charging circuit is used for charging a double-voltage lithium battery pack, the double-voltage lithium battery pack comprises a first positive electrode end, a second positive electrode end and a negative electrode end, the double-voltage charging circuit comprises a charging unit, a first backflow preventing unit, a second backflow preventing unit and a third backflow preventing unit, and the charging unit comprises a first positive charging end, a second positive charging end and a negative charging end; the first end of the first backflow prevention unit is electrically connected with the first positive charging end, and the second end of the first backflow prevention unit is electrically connected with the first positive end; the first end of the second backflow prevention unit is electrically connected with the second positive charging end; the first end and the negative charge end electricity of third prevent flowing backwards unit are connected, and the second end and the negative pole end electricity of third prevent flowing backwards unit are connected to this problem of solving dual-voltage lithium cell group electric quantity backward flow charger.

Description

Dual-voltage charging circuit and method, dual-voltage lithium battery pack circuit and automobile
Technical Field
The invention relates to the technical field of automobiles, in particular to a dual-voltage charging circuit and method, a dual-voltage lithium battery pack circuit and an automobile.
Background
At present, the automobile power supply has two types of 12V and 24V, and the corresponding emergency starting power supply capable of providing the common use of the two automobile power supplies. The emergency starting power supply charges through the voltage of 220V externally connected with the charger, and when the charging of the existing charger is completed, the emergency starting power supply and a peripheral circuit thereof can generate electric quantity backflow through the charger.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a double-voltage charging circuit, a double-voltage lithium battery pack circuit and an automobile, which are used for solving the problem of electric quantity backflow of a charger.
According to a first aspect of the present invention, there is provided a dual voltage charging circuit for charging a dual voltage lithium battery pack, the dual voltage lithium battery pack including a first positive terminal, a second positive terminal and a negative terminal, comprising:
the charging unit comprises a first positive charging end, a second positive charging end and a negative charging end;
the first end of the first backflow prevention unit is electrically connected with the first positive charging end, and the second end of the first backflow prevention unit is electrically connected with the first positive end;
the first end of the second backflow prevention unit is electrically connected with the second positive charging end, and the second end of the second backflow prevention unit is electrically connected with the second positive end;
and the first end of the third backflow prevention unit is electrically connected with the negative charging end, and the second end of the third backflow prevention unit is electrically connected with the negative electrode end.
According to the dual-voltage charging circuit, the first positive charging end, the second positive charging end and the negative charging end of the charging unit are sequentially connected with the first backflow preventing unit, the second backflow preventing unit and the third backflow preventing unit, so that the problem of a dual-voltage lithium battery pack electric quantity backflow charger is solved.
In some embodiments, the first backflow preventing unit includes a third diode, an anode of the third diode is electrically connected to the first positive charging terminal, and a cathode of the third diode is electrically connected to the first positive terminal.
In some embodiments, the second backflow prevention unit includes a second MOS transistor, a source of the second MOS transistor is electrically connected to the second positive charging terminal, and a drain of the second MOS transistor is electrically connected to the second positive terminal.
In some embodiments, the third backflow prevention unit includes a first MOS transistor, a source of the first MOS transistor is electrically connected to the negative charging terminal, and a drain of the first MOS transistor is electrically connected to the negative terminal.
In some embodiments, the charging unit includes:
a transformer comprising a primary winding, a first secondary winding, and a second secondary winding;
the first rectifying and filtering unit is respectively and electrically connected with the first secondary winding, the first backflow preventing unit and the second backflow preventing unit;
the second rectifying and filtering unit is respectively and electrically connected with the second secondary winding, the second backflow preventing unit and the third backflow preventing unit;
the control unit is electrically connected with the second rectifying and filtering unit;
and the control switch is electrically connected with the control unit and the converter respectively.
In some embodiments, the first rectifying and filtering unit includes:
the anode of the second diode is electrically connected with the first end of the first secondary winding, and the cathode of the second diode is electrically connected with the first end of the first backflow prevention unit;
the first end of the second capacitor is electrically connected with the negative electrode of the second diode, and the second end of the second capacitor is electrically connected with the second end of the first secondary winding;
the second rectifying and filtering unit includes:
the positive electrode of the first diode is electrically connected with the first end of the second secondary winding, and the negative electrode of the first diode is electrically connected with the first end of the second backflow prevention unit;
and the first end of the first capacitor is electrically connected with the negative electrode of the first diode, and the second end of the first capacitor is electrically connected with the second end of the second secondary winding.
In some embodiments, the control end of the second backflow preventing unit is electrically connected with the negative electrode of the second diode through a fourth resistor, and the control end of the second backflow preventing unit is electrically connected with the second end of the first secondary winding and the first end of the second backflow preventing unit through a third resistor respectively;
the first end of the third backflow prevention unit is electrically connected with the second end of the second secondary winding, the control end of the third backflow prevention unit is electrically connected with the negative electrode of the first diode through a second resistor, and the control end of the third backflow prevention unit is electrically connected with the first end of the third backflow prevention unit through a first resistor.
According to a second aspect of the present invention, there is provided a charging method, which is performed in the dual-voltage charging circuit, comprising:
when the charging unit supplies power, the first backflow preventing unit, the second backflow preventing unit and the third backflow preventing unit are respectively conducted so as to charge the double-voltage lithium battery pack;
when the charging unit stops supplying power, the first backflow preventing unit, the second backflow preventing unit and the third backflow preventing unit are respectively disconnected, so that the electric quantity of the double-voltage lithium battery pack is prevented from flowing back to the charging unit.
According to a third aspect of the present invention, there is provided a dual-voltage lithium battery pack circuit including the dual-voltage charging circuit and the dual-voltage lithium battery pack described above.
According to a fourth aspect of the present invention, there is provided an automobile comprising the above-described dual-voltage lithium battery pack circuit.
Compared with the prior art, the dual-voltage charging circuit, the dual-voltage lithium battery pack circuit and the automobile are characterized in that the first positive charging end, the second positive charging end and the negative charging end of the charging unit are sequentially connected with the first backflow preventing unit, the second backflow preventing unit and the third backflow preventing unit, so that the problem of the dual-voltage lithium battery pack electric quantity backflow charger is solved.
Drawings
FIG. 1 is a schematic circuit diagram of a dual voltage lithium battery circuit according to an embodiment of the present invention;
fig. 2 is a flowchart of a charging method according to an embodiment of the invention.
Reference numerals illustrate: the double-voltage charging circuit 10, the charging unit 11, the first backflow preventing unit 12, the second backflow preventing unit 13, the third backflow preventing unit 14, the double-voltage lithium battery pack 20, the first positive electrode terminal 21, the second positive electrode terminal 22 and the negative electrode terminal 23.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
According to a first aspect of the invention, fig. 1 schematically shows a dual voltage charging circuit 10 according to an embodiment of the invention for charging a dual voltage lithium battery pack 20. As shown in fig. 1-2, the dual voltage charging circuit 10 includes a charging unit 11, a first backflow prevention unit 12, a second backflow prevention unit 13, and a third backflow prevention unit 14; the dual-voltage lithium battery pack 20 includes a first positive terminal 21, a second positive terminal 22 and a negative terminal 23, where the first positive terminal 21 corresponds to 24V of the automobile, the second positive terminal 22 corresponds to 12V of the automobile, and the voltage value of the first positive terminal 21 is +25.9v, and the voltage value of the second positive terminal 22 is +14.8v, and of course, the first positive terminal 21 and the second positive terminal 22 can be adjusted according to actual needs, except +25.9v and +14.8v, respectively.
The charging unit 11 includes a first positive charging terminal 111, a second positive charging terminal 112, and a negative charging terminal 113; a first end of the first backflow preventing unit 12 is electrically connected to the first positive charging terminal 111, and a second end of the first backflow preventing unit 12 is electrically connected to the first positive terminal 21; the first end of the second backflow prevention unit 13 is electrically connected with the second positive charging end 112, and the second end of the second backflow prevention unit 13 is electrically connected with the second positive electrode end 22; the first end of the third backflow prevention unit 14 is electrically connected with the negative charging end 113, and the second end of the third backflow prevention unit 14 is electrically connected with the negative electrode end 23, so that the problem of the electric quantity backflow charger of the double-voltage lithium battery pack 20 can be solved.
The charging unit 11 further comprises a converter, a first rectifying and filtering unit, a second rectifying and filtering unit, a control unit and a control switch; the converter comprises a primary winding, a first secondary winding and a second secondary winding, and the primary winding of the converter is externally connected with 220V alternating current.
The first rectifying and filtering unit is electrically connected with the first secondary winding and the first backflow preventing unit 12 respectively; specifically, the first rectifying and filtering unit includes a second diode D101 and a second capacitor C101, where an anode of the second diode D101 is electrically connected to the first end of the first secondary winding, and a cathode of the second diode D101 forms a first positive charging end 111 and is electrically connected to the first end of the first backflow preventing unit 12; the first end of the second capacitor C101 is electrically connected with the cathode of the second diode D101, and the second end of the second capacitor C101 is electrically connected with the second end of the first secondary winding; the first rectifying and filtering unit is used for rectifying and filtering the alternating current of the first secondary winding to form direct current.
The second rectifying and filtering unit is respectively and electrically connected with the second secondary winding and the second backflow preventing unit 13; specifically, the second rectifying and filtering unit includes a first diode D100 and a first capacitor C100, where an anode of the first diode D100 is electrically connected to a first end of the second secondary winding, and a cathode of the first diode D100 is electrically connected to a first end of the second backflow preventing unit 13; a first end of the first capacitor C100 is electrically connected with the cathode of the first diode D100, and a second end of the first capacitor C100 is electrically connected with a second end of the second secondary winding; the second rectifying and filtering unit is used for rectifying and filtering the alternating current of the second secondary winding to form direct current.
The control unit is electrically connected with the second rectifying and filtering unit, specifically, the control unit is an EG4321 chip (namely an IC 100), and two pins of the EG4321 chip are respectively electrically connected with the second end of the second secondary winding and the cathode of the first diode D100.
The control switch is electrically connected with the control unit and the converter respectively, specifically, the control switch is an optocoupler IC1, a first end of the optocoupler IC1 is electrically connected with a cathode of the first diode D100 through a resistor R, a second end of the optocoupler IC1 is electrically connected with one pin of the EG4321 chip, a third end of the optocoupler IC1 is grounded, and a fourth end of the optocoupler IC1 is electrically connected with a primary winding of the converter, so that the flyback converter is formed.
The first backflow preventing unit 12 includes a third diode D102, the positive electrode of the third diode D102 is electrically connected to the first positive charging terminal 111, that is, the positive electrode of the third diode D102 is electrically connected to the negative electrode of the second diode D101, and the negative electrode of the third diode D102 is electrically connected to the first positive terminal 21.
The second backflow prevention unit 13 is electrically connected with the first rectifying and filtering unit, specifically, the control end of the second backflow prevention unit 13 is electrically connected with the negative electrode of the second diode D101 through the fourth resistor R103, and the control end of the second backflow prevention unit 13 is electrically connected with the second end of the first secondary winding and the second end of the second backflow prevention unit 13 through the third resistor R102.
The second backflow prevention unit 13 includes a second MOS transistor Q101, where a source of the second MOS transistor Q101 is electrically connected to the second positive charging end 111, that is, a source of the second MOS transistor Q101 is electrically connected to a negative electrode of the first diode D100, and a drain of the second MOS transistor Q101 is electrically connected to the second positive electrode end 22; the grid electrode of the second MOS tube Q101 is respectively and electrically connected with the second end of the first secondary winding and the source electrode of the second MOS tube Q101 through a third resistor R102.
The third backflow prevention unit 14 is electrically connected to the second rectifying and filtering unit, specifically, a first end of the third backflow prevention unit 14 is electrically connected to a second end of the second secondary winding, a control end of the third backflow prevention unit 14 is electrically connected to a negative electrode of the first diode D101 through the second resistor R101, and a control end of the third backflow prevention unit 14 is electrically connected to a first end of the third backflow prevention unit 14 through the first resistor R100.
The third backflow prevention unit 14 includes a first MOS transistor Q100, where a source of the first MOS transistor Q100 is electrically connected to the negative charging end 113, that is, a source of the first MOS transistor Q100 is electrically connected to the second end of the second secondary winding, and a drain of the first MOS transistor Q100 is electrically connected to the negative end 23; the grid electrode of the first MOS tube Q100 is electrically connected with the cathode of the first diode D101 through the second resistor R101, and the grid electrode of the first MOS tube Q100 is electrically connected with the source electrode of the first MOS tube Q100 through the first resistor R100.
The invention solves the problem of the double-voltage lithium battery pack 20 electric quantity backflow charger by sequentially connecting the first backflow preventing unit 12, the second backflow preventing unit 13 and the third backflow preventing unit 14 at the first positive charging end 111, the second positive charging end 112 and the negative charging end 113 of the charging unit 11.
According to a second aspect of the invention, fig. 2 schematically shows a charging method according to the invention, performed on a dual voltage charging circuit as described above. As shown in fig. 2, the charging method includes:
s100, when the charging unit 11 supplies power, the first backflow prevention unit 12, the second backflow prevention unit 13 and the third backflow prevention unit 14 are respectively conducted to charge the double-voltage lithium battery pack 20;
and S200, when the charging unit 11 stops supplying power, the first backflow preventing unit 12, the second backflow preventing unit 13 and the third backflow preventing unit 14 are respectively disconnected to prevent the electric quantity of the double-voltage lithium battery pack 20 from flowing back to the charging unit 11.
The specific processing procedure has been described in the dual-voltage charging circuit in the above embodiment, and thus will not be described herein.
According to a third aspect of the present invention, fig. 1 schematically shows a dual voltage lithium battery pack circuit according to an embodiment of the present invention, which includes the dual voltage charging circuit 10 and the dual voltage lithium battery pack 20 described above.
The dual-voltage lithium battery pack 20 includes a plurality of batteries connected in series, specifically, the dual-voltage lithium battery pack 20 includes a lithium battery pack AC formed by connecting seven lithium batteries in series, the positive electrode C of the lithium battery pack forms a first positive electrode terminal 21, and the positive electrode B of the fourth lithium battery in the lithium battery pack forms a second positive electrode terminal 22 from the positive electrode to the negative electrode of the lithium battery pack.
The dual-voltage lithium battery pack 20 is also connected with a protection circuit, the protection circuit comprises a control IC, wherein the 6 th pin-12 th pin of the control IC is electrically connected with the positive electrode of each lithium battery in the lithium battery pack AC through a resistor R9-resistor R3 respectively, the 1 st pin of the control IC is electrically connected with the negative electrode of the lithium battery pack AC, the 1 st pin and the 13 th pin of the control IC are electrically connected with an NTC, the 1 st pin of the control IC is sequentially connected with a resistor R1, a MOS tube Q2 and a MOS tube Q1 in series, the MOS tube Q2 and the MOS tube Q1 are sequentially connected with a diode D2 and a diode D1 in parallel, the MOS tube Q1 is electrically connected with the drain electrode of the first MOS tube Q100, the 2 nd pin of the control IC is electrically connected between the resistor R1 and the MOS tube Q2 through the resistor R2, the 3 rd pin of the control IC is sequentially connected with the resistor R10 and the switch K1 in series, the switch K1 is electrically connected with the grid electrode of the MOS tube Q2, the 4 th pin of the control IC is electrically connected with the grid electrode of the MOS tube Q1 through the resistor R11, the 5 th pin of the control IC is electrically connected with the drain electrode of the first MOS tube Q100 through the resistor R12, and the protection circuit has the functions of charge overvoltage protection, charge overcurrent protection, discharge undervoltage protection, start discharge overcurrent protection, discharge overcurrent protection of other circuits, high-low temperature protection and the like of the lithium battery pack.
It should be noted that, the dual-voltage lithium battery pack 20 can correspondingly adjust the number of lithium batteries connected in series according to the needs, and can also perform parallel combination of lithium batteries according to the needs; the negative terminal 23 of the dual-voltage lithium battery pack 20 may be electrically connected to the negative charging terminal 113 of the dual-voltage charging circuit 10 through a charging/discharging MOS tube, so that the dual-voltage lithium battery pack 20 may be charged by the dual-voltage charging circuit 10; the first MOS tube Q100 and the second MOS tube Q101 of the dual-voltage charging circuit 10 are opened when the charging unit 11 works to provide a channel for charging the dual-voltage lithium battery pack 20, the charging unit 11 stops supplying power and is automatically turned off, and the first MOS tube Q100 prevents the current of other circuit parts from generating electric quantity backflow through a charger when the protection circuit of the dual-voltage lithium battery pack 20 stops discharging, namely, the MOS tube is turned off; the second MOS transistor Q101 mainly prevents the 4-string lithium battery from providing current to the charger voltage stabilizing chip, and the third diode D102 prevents the 7-string lithium battery from providing current to the fourth resistor R103, the third resistor R102, the second resistor R101, the first resistor R100, the IC100, and the like.
According to a fourth aspect of the invention, an embodiment of the invention provides an automobile comprising the dual voltage lithium battery pack circuit described above.
What has been described above is merely some embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.

Claims (10)

1. A dual voltage charging circuit for charging a dual voltage lithium battery pack, the dual voltage lithium battery pack including a first positive terminal, a second positive terminal, and a negative terminal, comprising:
the charging unit comprises a first positive charging end, a second positive charging end and a negative charging end;
the first end of the first backflow prevention unit is electrically connected with the first positive charging end, and the second end of the first backflow prevention unit is electrically connected with the first positive end;
the first end of the second backflow prevention unit is electrically connected with the second positive charging end, and the second end of the second backflow prevention unit is electrically connected with the second positive end;
and the first end of the third backflow prevention unit is electrically connected with the negative charging end, and the second end of the third backflow prevention unit is electrically connected with the negative electrode end.
2. The dual voltage charging circuit of claim 1, wherein the first backflow prevention unit comprises a third diode, an anode of the third diode is electrically connected to the first positive charging terminal, and a cathode of the third diode is electrically connected to the first positive terminal.
3. The dual voltage charging circuit of claim 1, wherein the second backflow prevention unit comprises a second MOS transistor, a source of the second MOS transistor is electrically connected to the second positive charging terminal, and a drain of the second MOS transistor is electrically connected to the second positive terminal.
4. The dual voltage charging circuit of claim 1, wherein the third backflow prevention unit comprises a first MOS transistor, a source of the first MOS transistor is electrically connected to the negative charging terminal, and a drain of the first MOS transistor is electrically connected to the negative terminal.
5. The dual voltage charging circuit of any one of claims 1-4, wherein the charging unit comprises:
a transformer comprising a primary winding, a first secondary winding, and a second secondary winding;
the first rectifying and filtering unit is respectively and electrically connected with the first secondary winding, the first backflow preventing unit and the second backflow preventing unit;
the second rectifying and filtering unit is respectively and electrically connected with the second secondary winding, the second backflow preventing unit and the third backflow preventing unit;
the control unit is electrically connected with the second rectifying and filtering unit;
and the control switch is electrically connected with the control unit and the converter respectively.
6. The dual voltage charging circuit of claim 5, wherein the first rectifying and filtering unit comprises:
the anode of the second diode is electrically connected with the first end of the first secondary winding, and the cathode of the second diode is electrically connected with the first end of the first backflow prevention unit;
the first end of the second capacitor is electrically connected with the negative electrode of the second diode, and the second end of the second capacitor is electrically connected with the second end of the first secondary winding;
the second rectifying and filtering unit includes:
the positive electrode of the first diode is electrically connected with the first end of the second secondary winding, and the negative electrode of the first diode is electrically connected with the first end of the second backflow prevention unit;
and the first end of the first capacitor is electrically connected with the negative electrode of the first diode, and the second end of the first capacitor is electrically connected with the second end of the second secondary winding.
7. The dual-voltage charging circuit of claim 6, wherein the control end of the second backflow prevention unit is electrically connected to the negative electrode of the second diode through a fourth resistor, and the control end of the second backflow prevention unit is electrically connected to the second end of the first secondary winding and the first end of the second backflow prevention unit through a third resistor, respectively;
the first end of the third backflow prevention unit is electrically connected with the second end of the second secondary winding, the control end of the third backflow prevention unit is electrically connected with the negative electrode of the first diode through a second resistor, and the control end of the third backflow prevention unit is electrically connected with the first end of the third backflow prevention unit through a first resistor.
8. A charging method, characterized in that it is performed in the dual voltage charging circuit of any one of claims 1 to 7, comprising:
when the charging unit supplies power, the first backflow preventing unit, the second backflow preventing unit and the third backflow preventing unit are respectively conducted so as to charge the double-voltage lithium battery pack;
when the charging unit stops supplying power, the first backflow preventing unit, the second backflow preventing unit and the third backflow preventing unit are respectively disconnected, so that the electric quantity of the double-voltage lithium battery pack is prevented from flowing back to the charging unit.
9. A dual voltage lithium battery pack circuit comprising the dual voltage charging circuit of any one of claims 1-7 and a dual voltage lithium battery pack.
10. An automobile comprising the dual voltage lithium battery pack circuit of claim 9.
CN202311865923.9A 2023-12-30 2023-12-30 Dual-voltage charging circuit and method, dual-voltage lithium battery pack circuit and automobile Pending CN117578676A (en)

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CN202311865923.9A CN117578676A (en) 2023-12-30 2023-12-30 Dual-voltage charging circuit and method, dual-voltage lithium battery pack circuit and automobile

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CN202311865923.9A CN117578676A (en) 2023-12-30 2023-12-30 Dual-voltage charging circuit and method, dual-voltage lithium battery pack circuit and automobile

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CN117578676A true CN117578676A (en) 2024-02-20

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