CN108075527B - Method for charging and discharging battery pack and controlling external power supply - Google Patents
Method for charging and discharging battery pack and controlling external power supply Download PDFInfo
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- CN108075527B CN108075527B CN201611021002.4A CN201611021002A CN108075527B CN 108075527 B CN108075527 B CN 108075527B CN 201611021002 A CN201611021002 A CN 201611021002A CN 108075527 B CN108075527 B CN 108075527B
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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
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- 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
- B60L58/21—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 having the same nominal voltage
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- 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 embodiment of the invention discloses a method for controlling charging, discharging and external power supply of a battery pack, relates to the control technology of the battery pack, and can simultaneously solve the problem that the charging interface has voltage when the battery pack is not charged; when the discharge is not performed, the discharge interface has voltage; when the battery pack is not charged or discharged, the battery pack control circuit consumes the electric quantity of the battery. When the battery pack is not charged, the positive line of the charging interface is blocked by a bidirectional solid-state relay with the positive bus, when the battery pack is not discharged, the discharging interface is blocked by a unidirectional solid-state relay with the positive bus, the charging interface has no voltage, meanwhile, no short circuit exists between the 1 and 2 points in the discharging control interface, and the circuit is used for charging and discharging the battery pack and controlling external power supply.
Description
Technical Field
The invention relates to the technical field of control of battery packs, in particular to a method for controlling charging, discharging and external power supply of a battery pack.
Background
With the development of new energy technology in recent decades, reusable storage batteries have been widely used in electric vehicles, electric locomotives, and spacecraft. However, in the past, much attention has been paid to the balance control of the battery cells during the charging and discharging process, the prediction of the state of charge (SOC) of the battery, the prediction of the state of health (SOH) of the battery, and the like. However, for a battery pack having a guaranteed safety and life span, the following three problems should be solved:
(1) when the charging is not carried out, the charging interface can not have voltage;
(2) when the discharge is not carried out, the discharge interface can not have voltage;
(3) when the battery pack is not charged or discharged, the battery pack control circuit cannot consume the electric quantity of the battery.
In order to solve the above 3 problems, a reasonable method for charging, discharging and externally supplying the battery pack must be designed. On the other hand, due to the limitation of the energy density of the battery pack, the circuit implementing the control method must be sufficiently compact and efficient. However, none of the prior art disclosed herein is capable of solving the above three problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for controlling the charging, discharging and external power supply of a battery pack, and can simultaneously solve the problem that (1) when the battery pack is not charged, the charging interface has voltage; (2) when the discharge is not performed, the discharge interface has voltage; (3) when the battery pack is not charged or discharged, the battery pack control circuit consumes the electric quantity of the battery.
The technical solution of the invention is as follows:
in one aspect, a battery pack charging, discharging and external power supply control circuit for controlling power supply of a battery pack comprises 1 bidirectional solid-state relay, 2 unidirectional solid-state relays, 1 DC/DC converter without an enable terminal, 1 DC/DC converter with an enable terminal, 2 diodes, 2 discharge resistors, 2 sampling potentiometers, 1 positive bus and 1 negative bus;
the positive electrode and the negative electrode of the battery pack are respectively connected to the positive bus and the negative bus; the negative bus is also respectively connected with the negative end of the charging interface, the negative end of the discharging interface, the 2 nd point of the discharging control interface, the input negative end of the DC/DC converter without the enabling end, the input negative end of the DC/DC converter with the enabling end and the 2 nd point of 2 discharging resistors; the positive end of the charging interface is connected to the OUT _ A end of the bidirectional solid-state relay, the 1 st point of the first discharging resistor, the positive end of the first diode and the 1 st and 2 nd points of the first sampling potentiometer; the OUT _ B end of the bidirectional solid-state relay is connected to the positive bus; the positive end of the discharging interface is connected to the OUT-end of the unidirectional solid-state relay and the 1 st point of the second discharging resistor; the OUT + ends of the two unidirectional solid-state relays are connected to the positive bus; the OUT-end of the first unidirectional solid-state relay is connected to the positive end of the discharge interface and the 1 st point of the second discharge resistor; the enabling end of the DC/DC converter without the enabling end is connected to the 1 st point of the discharge control interface; the OUT-end of the second unidirectional solid-state relay is connected to the positive end of the 2 nd diode and the 1 st and 2 nd points of the second sampling potentiometer; the negative terminals of the two diodes are connected IN common to the IN + terminal of the "DC/DC converter without enable terminal"; the output OUT + terminal of the DC/DC converter without the enable terminal is connected to the VCC terminal of the BMS controller; the output OUT-end of the DC/DC converter without the enable end is connected to the GND end of the BMS controller, the 2 nd points of the two sampling resistors, the input negative IN-point of the bidirectional solid-state relay and the input negative IN-point of the first unidirectional solid-state relay; the sampling terminal AD1 of the BMS controller is connected to the 3 rd point of the first sampling potentiometer and the 1 st point of the sampling resistor; the sampling terminal AD2 of the BMS controller is connected to the 3 rd point of the second sampling potentiometer and the 1 st point of the sampling resistor; an IO control signal IO1 of the BMS controller is connected to an input positive IN + point of the 1 st unidirectional solid-state relay; the IO control signal IO2 of the BMS controller is connected to the input positive IN + point of the bi-directional solid state relay.
In another aspect, a method for controlling charging, discharging and external power supply based on the above circuit comprises the following steps:
when the battery needs to be charged, direct-current charging voltage is directly added between the positive side and the negative side of the charging interface, after the BMS controller samples the signal through the AD1 sampling terminal, the BMS controller controls the conduction between the output ports OUT _ A and OUT _ B of the bidirectional solid-state relay through the IO signal, and the charging voltage charges the battery pack through the bidirectional relay;
when the battery needs to be discharged, two cores 1 and 2 of a discharge control interface are in short circuit, a DC/DC converter with an enabling end receives a low-level enabling signal, the DC/DC converter with the enabling end is started, a direct-current voltage is generated between output ends OUT + and OUT-of the DC/DC converter with the enabling end, output ends OUT + and OUT-of a second one-way solid-state relay are conducted, after the BMS controller samples the signal through an AD2 sampling end, the BMS controller controls the conduction between output ends OUT + and OUT-of a 1 st one-way solid-state relay through an IO signal, and a battery pack is discharged to the outside through the one-way solid-state relay;
when the charging is not carried out, a bidirectional solid-state relay is used for blocking the positive line and the positive bus of the charging interface, so that the charging interface has no voltage.
When the discharge is not performed, the discharge interface and the positive bus are blocked by a one-way solid-state relay, so that the discharge interface has no voltage.
The charging interface has no voltage, and meanwhile, no short circuit exists between the two points 1 and 2 in the discharging control interface.
According to the method for controlling the charging, the discharging and the external power supply of the battery pack, which is provided by the embodiment of the invention, the charging, the discharging and the external power supply are adopted between the battery pack, the BMS controller and the external interface, so that the problem that the charging interface cannot have voltage when the battery pack is not charged is solved; when the discharge is not carried out, the discharge interface can not have voltage; when the battery pack is not charged or discharged, the battery pack control circuit cannot consume the electric quantity of the battery.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic diagram of a battery pack charging, discharging and external power supply control circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the operation flow of the BMS controller according to the embodiment of the present invention.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the device structures and/or processing steps that are closely related to the scheme according to the present invention are shown in the drawings, and other details that are not so relevant to the present invention are omitted.
An embodiment of the present invention provides a battery pack charging, discharging and external power supply control circuit, referring to fig. 1,
in the figure: k1, bidirectional solid state relay; k2, one-way solid state relay; k3, one-way solid state relay; DC/DC1, DC/DC converter without an enable terminal; DC/DC2, DC/DC converter with enable end; v1, diode; v2, diode; r1, discharge resistance; r2, discharge resistance; w1, sampling potentiometer; w2, sampling potentiometer; r3, a sampling resistor; r4, a sampling resistor; u1, positive bus; u2, negative bus; u3, battery pack; u4, BMS controller; x1, charging interface; x2, discharge interface; x3, discharge control interface.
The circuit is used for controlling power supply of a battery pack and comprises 1 bidirectional solid-state relay, 2 unidirectional solid-state relays, 1 DC/DC converter without an enabling end, 1 DC/DC converter with an enabling end, 2 diodes, 2 discharging resistors, 2 sampling potentiometers, 1 positive bus and 1 negative bus;
the positive electrode and the negative electrode of the battery pack are respectively connected to the positive bus and the negative bus; the negative bus is also respectively connected with the negative end of a charging interface, the negative end of a discharging interface, the 2 nd point of a discharging control interface, the input negative end of a DC/DC converter without an enabling end, the input negative end of the DC/DC converter with the enabling end and the 2 nd point of 2 discharging resistors; the positive end of the charging interface is connected to the OUT _ A end of the bidirectional solid-state relay, the 1 st point of the first discharging resistor, the positive end of the first diode and the 1 st and 2 nd points of the first sampling potentiometer; the OUT _ B end of the bidirectional solid-state relay is connected to the positive bus; the positive end of the discharging interface is connected to the OUT-end of the unidirectional solid-state relay and the 1 st point of the second discharging resistor; the OUT + ends of the two unidirectional solid-state relays are connected to the positive bus; the OUT-end of the first unidirectional solid-state relay is connected to the positive end of the discharge interface and the 1 st point of the second discharge resistor; the enabling end of the DC/DC converter without the enabling end is connected to the 1 st point of the discharging control interface; the OUT-end of the second unidirectional solid-state relay is connected to the positive end of the 2 nd diode and the 1 st and 2 nd points of the second sampling potentiometer; the negative terminals of the two diodes are connected IN common to the IN + terminal of the "DC/DC converter without enable terminal"; the output OUT + terminal of the DC/DC converter without the enable terminal is connected to the VCC terminal of the BMS controller; the output OUT-end of the DC/DC converter without the enable end is connected to the GND end of the BMS controller, the 2 nd points of the two sampling resistors, the input negative IN-point of the bidirectional solid-state relay and the input negative IN-point of the first unidirectional solid-state relay; the sampling terminal AD1 of the BMS controller is connected to the 3 rd point of the first sampling potentiometer and the 1 st point of the sampling resistor; the sampling terminal AD2 of the BMS controller is connected to the 3 rd point of the second sampling potentiometer and the 1 st point of the sampling resistor; an IO control signal IO1 of the BMS controller is connected to an input positive IN + point of the 1 st unidirectional solid-state relay; the IO control signal IO2 of the BMS controller is connected to the input positive IN + point of the bi-directional solid state relay.
In the schematic diagram of the control circuit structure shown in this embodiment, the battery pack U3 and the BMS controller U4 are components included in the battery pack in the prior art, and the charging interface X1, the discharging interface X2 and the discharging control interface X3 of the battery pack are also external interfaces inherent to a general battery pack, so the battery pack U3, the BMS controller U4, the charging interface X1, the discharging interface X2 and the discharging control interface X3 described above are not the inventive content of this patent, but in order to illustrate the methods for charging, discharging and externally supplying power to the battery pack according to the present invention, it is necessary to combine the battery pack U3, the BMS controller U4, the charging interface X1, the discharging interface X2 and the discharging control interface X3 for description.
In the prior art, a battery pack and a BMS controller are included in a battery pack, an external interface of the battery pack generally includes three interfaces, namely a discharging interface, a charging interface and a discharging control interface, and external discharging of the battery pack is controlled by controlling on and off of two core points in the discharging control interface. In the battery pack charging, discharging and external power supply control circuit provided by the embodiment, a charging, discharging and external power supply control method is adopted between the battery pack and the BMS controller and the external interface, so that the problem that the charging interface cannot have voltage when the battery pack is not charged in the background art is solved; when the discharge is not carried out, the discharge interface can not have voltage; when the battery pack is not charged or discharged, the battery pack control circuit cannot consume the electric quantity of the battery.
Based on the control circuit, the embodiment of the invention provides a method for controlling charging, discharging and external power supply, which is characterized by comprising the following steps:
when the battery needs to be charged, direct-current charging voltage is directly added between the positive side and the negative side of the charging interface, after the BMS controller samples the signal through the AD1 sampling terminal, the BMS controller controls the conduction between the output ports OUT _ A and OUT _ B of the bidirectional solid-state relay through the IO signal, and the charging voltage charges the battery pack through the bidirectional relay;
when the battery needs to be discharged, two cores 1 and 2 of a discharge control interface are in short circuit, a DC/DC converter with an enabling end receives a low-level enabling signal, the DC/DC converter with the enabling end is started, a direct-current voltage is generated between output ends OUT + and OUT-of the DC/DC converter with the enabling end, so that output ends OUT + and OUT-of a second one-way solid-state relay are conducted, after the BMS controller samples the signal through an AD2 sampling end, the BMS controller controls the output ends OUT + and OUT-of a 1 st one-way solid-state relay to be conducted through an IO signal, and the battery pack discharges outwards through the one-way solid-state relay;
when the charging is not carried out, the positive line of the charging interface is blocked by the bidirectional solid-state relay with the positive bus, so that when the charging is not carried out, the charging interface has no voltage.
When the discharge is not performed, the discharge interface and the positive bus are blocked by a one-way solid-state relay, so that when the discharge is not performed, the discharge interface has no voltage.
When not charging, not discharging, namely the interface that charges does not have voltage, does not have the short circuit condition between 1 in the control interface that discharges simultaneously, 2 two points: the "DC/DC converter with enable" does not work because it does not have an "enable" signal; the "DC/DC converter without an enable terminal" does not operate because there is no input voltage; the BMS controller does not operate because it does not have an input voltage. In this state, no device consuming battery power is present in the control circuit, and the conclusion can be drawn: the battery pack control circuit cannot consume the battery itself.
In the method for controlling charging, discharging and external power supply of the battery pack provided by the embodiment, a method for controlling charging, discharging and external power supply is adopted between the battery pack, the BMS controller and the external interface, so that the problem that the charging interface cannot have voltage when the battery pack is not charged in the background art is solved; when the discharge is not carried out, the discharge interface can not have voltage; when the battery pack is not charged or discharged, the battery pack control circuit cannot consume the electric quantity of the battery.
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in fig. 1, a specific embodiment of a charging, discharging and external power supply control method is implemented by a set of circuits, which includes a bidirectional solid-state relay K1, a unidirectional solid-state relay K2, a DC/DC converter DC/DC1 without an enable terminal, a DC/DC converter DC/DC2 with an enable terminal, a diode V1, a diode V2, a discharge resistor R1, a discharge resistor R2, a sampling resistor R3, a sampling resistor R4, a sampling potentiometer W1, a sampling potentiometer W2, a positive bus U1 and a negative bus U2.
The positive electrode and the negative electrode of the battery pack U3 are respectively connected to the positive bus U1 and the negative bus U2; the negative bus U2 is also respectively connected with a negative terminal of the charging interface X1, a negative terminal of the discharging interface X2, a point "2" of the discharging control interface X3, an input negative terminal of the DC/DC converter DC/DC1 without an enabling terminal, an input negative terminal of the DC/DC converter DC/DC2 with the enabling terminal, a point "2" of the discharging resistor R1 and a point "2" of the discharging resistor R2; the '+' end of the charging interface X1 is connected to the OUT _ A end of the bidirectional solid-state relay K1, the '1' point of the discharge resistor R1, the '+' end of the diode V1 and the 1 st and 2 nd points of the sampling potentiometer W1; the OUT _ B end of the bidirectional solid-state relay K1 is connected to the positive bus U2; the '+' end of the discharge interface X2 is connected to the OUT-end of the unidirectional solid-state relay K2 and the '1' point of the discharge resistor R2; the OUT + ends of the unidirectional solid-state relays K2 and K3 are connected to a positive bus U2; the OUT-terminal of the unidirectional solid-state relay K2 is connected to the + terminal of the discharge interface X2 and the 1 st point of the discharge resistor R2; the 'EN' enabling end of the DC/DC converter DC/DC1 without the enabling end is connected to the '1' point of the discharge control interface X3; the OUT-terminal of the unidirectional solid-state relay K3 is connected to the ' + ' terminal of the diode V2 and the ' 1 st and ' 2 nd ' points of the sampling potentiometer W2; the "-" terminals of the two diodes V1, V2 are both connected to the "IN +" terminal of the "DC/DC converter without enable DC/DC 1"; the output terminal OUT +' of the DC/DC converter DC/DC1 without the enable terminal is connected to the VCC terminal of the BMS controller U4; the output OUT-terminal of the DC/DC converter DC/DC1 without the enable terminal is connected to the GND terminal of the BMS controller U4, the 2 nd points of the two sampling resistors R3 and R4, the IN-input negative point of the bidirectional solid-state relay K1 and the IN-input negative point of the unidirectional solid-state relay K2; the sampling terminal "AD 1" of the BMS controller U4 is connected to the "3" point of the sampling potentiometer W1 and the "1" point of the sampling resistor R3; the sampling terminal "AD 2" of the BMS controller U4 is connected to the "3" point of the sampling potentiometer W2 and the "1" point of the sampling resistor R4; an IO control signal 'IO 1' of the BMS controller U4 is connected to an 'IN +' input positive point of the unidirectional solid-state relay K2; an IO control signal "IO 2" of the BMS controller U4 is connected to the input positive IN + point of the bidirectional solid-state relay K1.
The work of the battery pack is divided into two states of charging and discharging, and when charging, direct current charging voltage is directly added between points X1 plus and minus to charge the battery; during discharging, short circuit is generated between "1" and "2" of the discharge control interface X3, and then discharge is generated between "+" and "-" of the discharge interface X2.
The power supply to the BMS controller U4 in the battery pack is provided by the DC/DC converter DC/DC1 without enable, and the logic processing flow inside it is shown in the logic processing flow diagram in the BMS controller U4 of fig. 2. The BMS controller U4 first performs the step of querying the AD1 signal 101; then, the step of inquiring AD2 signal 102 is executed; next, the step of judging whether the AD1 signal > 0' 103 is executed; if the AD1 signal > "0", then executing the step of setting the IO1 signal as "high level" 105, and after the step of setting the IO1 signal as "high level" 105, executing the step of judging whether the AD2 signal > "0" 104; if the AD1 signal is not > "0", directly executing 104 step of judging whether the AD2 signal is > "0"; if the AD2 signal > "0", executing the step of setting the IO2 signal as high level 106, and returning to the step of re-executing the query AD1 signal 101 after the step of setting the IO2 signal as high level 106 is executed; if the AD2 signal is not > "0", returning to the step of re-executing the query AD1 signal 101; the operation is repeated in a circulating way.
When the battery pack needs to be charged, a direct-current charging voltage is added between plus and minus of the charging interface X1, and at the moment, the bidirectional solid-state relay K1 is not conducted, so that the charging voltage cannot directly charge the battery pack U3. However, at this time, the DC charging voltage supplies the input voltage to the DC/DC converter DC/DC1 without the enable terminal through the diode V1, the DC/DC converter DC/DC1 without the enable terminal starts to operate, a DC voltage is generated between the output terminals OUT + and OUT-of the DC/DC converter DC/DC1 without the enable terminal, the operating voltage is supplied to the BMS controller U4 through "VCC" and "GND" of the BMS controller U4, and the BMS controller U4 starts to operate. Meanwhile, a voltage value greater than 0V exists at the point "1" of the sampling resistor R3, when the BMS controller U4 executes the logic processing flow shown in fig. 2, a voltage value greater than 0V is found in the step of querying the AD1 signal 101, and a "yes" result is found in the step of determining whether the AD1 signal is > "0" 103, so that the step of setting the IO1 signal to "high" 105 is executed, when the IO1 signal of the BMS controller U4 is set to high, conduction is made between the OUT _ a point and the OUT _ B point of the bidirectional solid-state relay K1, and the dc charging voltage charges the battery pack U3 through the bidirectional solid-state relay K1. The sampling potentiometer W1 functions to adjust the magnitude of the voltage signal provided to the sampling point AD1 of the BMS controller U4.
When the battery needs to be discharged, 1 and 2 cores of the discharge control interface X3 are shorted, the DC/DC converter DC/DC2 with the enabling end receives a low-level enabling signal 'EN', the DC/DC converter DC/DC2 with the enabling end is started, a direct-current voltage is generated between the output ends OUT + and OUT-of the DC/DC converter DC/DC2 with the enabling end, a driving voltage is provided between the + point and the-point of the unidirectional solid-state relay K3, and the output ends OUT + and OUT-of the unidirectional solid-state relay K3 are conducted. At this time, the voltage on the positive bus U1 provides the input voltage to the DC/DC converter DC/DC1 without the enable terminal through the unidirectional solid-state relay K3 and the diode V2, and the DC/DC converter DC/DC1 without the enable terminal starts to operate. A DC voltage is generated between the output terminals OUT + and OUT-of the DC/DC converter DC/DC1 without the enable terminal, and the BMS controller U4 starts operating by supplying an operating voltage to the BMS controller U4 through VCC and GND of the BMS controller U4. Meanwhile, a voltage value greater than 0V exists at the point "1" of the sampling resistor R4, when the BMS controller U4 runs the logic processing flow shown in fig. 2, a voltage value greater than 0V is inquired in the step of inquiring the AD2 signal 102, and a result of "yes" is judged in the step of judging whether the AD2 signal is > "0", so that the step of setting the IO2 signal to "high level" 106 is executed, when the IO2 signal of the BMS controller U4 is set to high level, conduction is performed between the OUT + point and the OUT-point of the one-way solid-state relay K2, the voltage between the positive bus U1 and the negative bus U2 is applied to the space between "+, -" of the discharge interface X2 through the one-way solid-state relay K2, and the electric energy in the battery pack U3 can be discharged to the outside through the discharge interface X2. The sampling potentiometer W2 functions to adjust the magnitude of the voltage signal provided to the sampling point AD2 of the BMS controller U4.
A bidirectional solid-state relay K1 is adopted between the plus of the charging interface X1 and the positive bus U1 because bidirectional blocking voltage is needed; between the plus of the discharge interface X2 and the positive bus U1, only the voltage in the single direction from the positive bus U1 to the plus of the discharge interface X2 needs to be blocked, so a one-way solid-state relay K2 is adopted.
Since the bidirectional solid-state relay K1 has a leakage current between OUT _ a and OUT _ B when it is not turned on, the leakage current between OUT _ a and OUT _ B is eliminated by using the discharge resistor R1. Because the leakage current exists between the OUT + and the OUT-when the one-way solid-state relay K2 is not switched on, the discharge resistor R2 is adopted to eliminate the leakage current between the OUT + and the OUT-.
When not charging, the space between "+" of charging interface X1 and positive bus U1 is blocked by bidirectional solid-state relay K1, so when not charging, there is no voltage between "+, -" of charging interface X1.
However, when the discharge is not performed, the one-way solid-state relay K2 blocks between the plus of the discharge interface X2 and the positive bus U1, so that when the discharge is not performed, no voltage exists between the plus and the minus of the discharge interface X2.
When the charging interface X1 is not charged or discharged, namely, no voltage exists between plus and minus of the charging interface X1, and no short circuit exists between the two points 1 and 2 in the discharging control interface X2, the ' DC/DC converter DC/DC2 with the enabling end does not work because no ' enabling ' signal exists; "DC/DC converter without enable DC/DC 1" does not work because there is no input voltage; the BMS controller U4 does not operate because it has no input voltage. In this state, no device consuming battery power is present in the battery pack control circuit, and it can be concluded that: the battery pack control circuit cannot consume the battery itself.
Features that are described and/or illustrated above with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof.
The many features and advantages of these embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of these embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.
The invention has not been described in detail and is in part known to those of skill in the art.
Claims (2)
1. A battery pack charging, discharging and external power supply control circuit, wherein the circuit is used for controlling power supply of a battery pack, and comprises 1 bidirectional solid-state relay, 2 unidirectional solid-state relays, 1 DC/DC converter without an enabling end, 1 DC/DC converter with an enabling end, 2 diodes, 2 discharging resistors, 2 sampling potentiometers, 1 positive bus and 1 negative bus;
the positive electrode and the negative electrode of the battery pack are respectively connected to the positive bus and the negative bus; the negative bus is also respectively connected with the negative end of the charging interface, the negative end of the discharging interface, the 2 nd point of the discharging control interface, the input negative end of the DC/DC converter without the enabling end, the input negative end of the DC/DC converter with the enabling end and the 2 nd point of 2 discharging resistors; the positive end of the charging interface is connected to the OUT _ A end of the bidirectional solid-state relay, the 1 st point of the first discharging resistor, the positive end of the first diode and the 1 st and 2 nd points of the first sampling potentiometer; the OUT _ B end of the bidirectional solid-state relay is connected to the positive bus; the positive end of the discharging interface is connected to the OUT-end of the unidirectional solid-state relay and the 1 st point of the second discharging resistor; the OUT + ends of the two unidirectional solid-state relays are connected to the positive bus; the OUT-end of the first unidirectional solid-state relay is connected to the positive end of the discharge interface and the 1 st point of the second discharge resistor; the enabling end of the DC/DC converter with the enabling end is connected to the 1 st point of the discharge control interface; the OUT-end of the second unidirectional solid-state relay is connected to the positive end of the 2 nd diode and the 1 st and 2 nd points of the second sampling potentiometer; the negative terminals of the two diodes are connected IN common to the IN + terminal of the "DC/DC converter without enable terminal"; the output OUT + terminal of the DC/DC converter without the enable terminal is connected to the VCC terminal of the BMS controller; the output OUT-end of the DC/DC converter without the enable end is connected to the GND end of the BMS controller, the 2 nd points of the two sampling resistors, the input negative IN-point of the bidirectional solid-state relay and the input negative IN-point of the first unidirectional solid-state relay; the sampling terminal AD1 of the BMS controller is connected to the 3 rd point of the first sampling potentiometer and the 1 st point of the sampling resistor; the sampling terminal AD2 of the BMS controller is connected to the 3 rd point of the second sampling potentiometer and the 1 st point of the sampling resistor; an IO control signal IO1 of the BMS controller is connected to an input positive IN + point of the 1 st unidirectional solid-state relay; the IO control signal IO2 of the BMS controller is connected to the input positive IN + point of the bi-directional solid state relay.
2. A charging, discharging and external power supply control method implemented based on the circuit of claim 1, characterized in that the method comprises the following processes:
when the battery needs to be charged, direct-current charging voltage is directly added between the positive side and the negative side of the charging interface, after the BMS controller samples the signal through the AD1 sampling terminal, the BMS controller controls the conduction between the output ports OUT _ A and OUT _ B of the bidirectional solid-state relay through the IO signal, and the charging voltage charges the battery pack through the bidirectional relay;
when the battery needs to be discharged, two cores 1 and 2 of a discharge control interface are in short circuit, a DC/DC converter with an enabling end receives a low-level enabling signal, the DC/DC converter with the enabling end is started, a direct-current voltage is generated between output ends OUT + and OUT-of the DC/DC converter with the enabling end, output ends OUT + and OUT-of a second one-way solid-state relay are conducted, after the BMS controller samples the signal through an AD2 sampling end, the BMS controller controls the conduction between output ends OUT + and OUT-of a 1 st one-way solid-state relay through an IO signal, and a battery pack is discharged to the outside through the one-way solid-state relay;
when the charging interface is not charged, a bidirectional solid-state relay is used for blocking a positive line and a positive bus of the charging interface, so that the charging interface has no voltage;
when the discharge is not performed, the discharge interface and the positive bus are blocked by a one-way solid-state relay, so that the discharge interface has no voltage;
the charging interface has no voltage, and meanwhile, no short circuit exists between the two points 1 and 2 in the discharging control interface.
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| CN201611021002.4A CN108075527B (en) | 2016-11-15 | 2016-11-15 | Method for charging and discharging battery pack and controlling external power supply |
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| CN201611021002.4A CN108075527B (en) | 2016-11-15 | 2016-11-15 | Method for charging and discharging battery pack and controlling external power supply |
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| CN108075527B true CN108075527B (en) | 2020-11-13 |
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| KR101136151B1 (en) * | 2010-01-27 | 2012-04-16 | 에스비리모티브 주식회사 | Secondary Battery |
| CN102117943B (en) * | 2011-01-19 | 2013-01-09 | 启明信息技术股份有限公司 | Intelligent charging method and device for battery management system of electric vehicle |
| JPWO2013042243A1 (en) * | 2011-09-22 | 2015-03-26 | トヨタ自動車株式会社 | Vehicle power system |
| US9166419B2 (en) * | 2011-10-31 | 2015-10-20 | Robert Bosch Gmbh | Intelligent charging and discharging system for parallel configuration of series cells with semiconductor switching |
| CN203554016U (en) * | 2013-11-05 | 2014-04-16 | 王襄 | Automatic charge/discharge switching controller for two storage batteries of automobile |
| KR20150126208A (en) * | 2014-05-02 | 2015-11-11 | 삼성에스디아이 주식회사 | Battery and battery management apparatus |
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