CN112440745A - Battery power supply system, control method thereof and vehicle - Google Patents

Battery power supply system, control method thereof and vehicle Download PDF

Info

Publication number
CN112440745A
CN112440745A CN201910804414.2A CN201910804414A CN112440745A CN 112440745 A CN112440745 A CN 112440745A CN 201910804414 A CN201910804414 A CN 201910804414A CN 112440745 A CN112440745 A CN 112440745A
Authority
CN
China
Prior art keywords
power supply
switch
charging
heating
battery
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
CN201910804414.2A
Other languages
Chinese (zh)
Inventor
石雷
李想想
陈明文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BYD Co Ltd
Original Assignee
BYD Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to CN201910804414.2A priority Critical patent/CN112440745A/en
Publication of CN112440745A publication Critical patent/CN112440745A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • 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
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a battery power supply system, a control method thereof and a vehicle, wherein the system comprises: a first power supply line and a second power supply line; one end of the battery component is connected with the first power supply circuit, and the other end of the battery component is connected with the second power supply circuit; the battery heating assembly comprises a heating resistor and a heating switch; the charging switch is arranged on the first power supply line; and the pre-charging circuit is connected with the charging switch in parallel, the pre-charging circuit comprises a charging switch and a heating resistor, one end of the pre-charging switch is connected with one end of the charging switch, the other end of the pre-charging switch is connected with one end of the heating resistor and one end of the heating switch, the other end of the heating resistor is connected with the other end of the charging switch, and the other end of the heating switch is connected with a second power supply line. Therefore, the pre-charging circuit and the battery heating assembly multiplex the heating resistor, so that the pre-charging resistor can be saved, the cost is reduced, and the failure rate of the whole vehicle is reduced.

Description

Battery power supply system, control method thereof and vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to a battery power supply system, a control method thereof and a vehicle.
Background
Because vehicles such as new energy automobile adopt high-voltage loop power supply, the instantaneous impact current generated in the electrifying moment of the high-voltage loop is up to thousands of amperes, and a main contactor or a main loop fuse is easily burnt out, so that the pre-charging of a load capacitor is an essential key link when the high-voltage loop is electrified.
In the related art, as shown in fig. 11, the power battery BT has two paths to the load capacitor C, namely, a pre-charging loop including a pre-charging switch K2 ' and a pre-charging resistor R ' and a main loop including a charging switch K1 ', and the two loops form a parallel network. The positive electrode of the power battery BT is connected to one end of a load capacitor C ' after passing through a main fuse F and then through a pre-charging switch K2 ' and a pre-charging resistor R ', the positive electrode of the power battery BT is connected to one end of the load capacitor C ' after passing through the main fuse F and then through a charging switch K1 ', the negative electrode of the power battery BT is connected to the other end of the load capacitor C ', and a heating resistor R1 ' and a switching tube Q ' are connected in series and then connected in parallel with the load capacitor C '. During precharging, K2 ' is attracted, the precharging circuit is conducted, wherein the precharging resistor R ' limits the current in the precharging circuit, so that K2 ' works in a safe current range. After the pre-charging is finished, the K1 ' is attracted, and the voltage difference between the BT end of the power battery and the C ' end of the load capacitor is very small, so that the current flowing through the K1 ' can be in a safe range.
However, the related art has a problem that in the pre-charging process, if the logic of the whole vehicle is wrong, the load current is caused at the load end or the load fails and is short-circuited, so that the pre-charging resistor is burnt out.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a battery power supply system to solve the problem that the pre-charge resistor is easily burned out, reduce the failure rate of the entire vehicle, and reduce the cost.
A second object of the invention is to propose a vehicle.
A third object of the present invention is to provide a control method of a battery power supply system.
A fourth object of the invention is to propose a readable storage medium.
To achieve the above object, an embodiment of a first aspect of the present invention provides a battery power supply system, including: a first power supply line and a second power supply line; one end of the battery component is connected with the first power supply circuit, and the other end of the battery component is connected with the second power supply circuit; the battery heating assembly comprises a heating resistor and a heating switch; the charging switch is arranged on the first power supply line; with the pre-charge circuit of switch parallel connection charges, the pre-charge circuit include the pre-charge switch with heating resistor, the one end of pre-charge switch with the one end of switch that charges links to each other, the other end of pre-charge switch with the one end of heating resistor with the one end of heating switch links to each other, the other end of heating resistor with the other end of switch that charges links to each other, the other end of heating switch with the second power supply line links to each other.
According to the battery power supply system provided by the embodiment of the invention, the pre-charging circuit and the battery heating assembly multiplex the heating resistor, so that the pre-charging resistor is not required to be arranged independently, the cost can be saved, and the heating resistor has high-power survivability and self temperature protection characteristics, so that the condition that the pre-charging resistor is easily burnt out due to load short circuit or control logic error can be avoided, the failure rate of the whole vehicle is reduced, and the cost can be reduced.
To achieve the above object, an embodiment of a second aspect of the present invention provides a vehicle including the battery power supply system according to the embodiment of the first aspect of the present invention.
According to the vehicle provided by the embodiment of the invention, the heating resistor is multiplexed by the pre-charging circuit and the battery heating component through the arranged battery power supply system, so that the pre-charging resistor does not need to be arranged independently, the cost can be saved, and the heating resistor has high-power survivability and self temperature protection characteristics, so that the condition that the pre-charging resistor is easily burnt out due to load short circuit or control logic error can be avoided, the failure rate of the whole vehicle is reduced, and the cost can be reduced.
To achieve the above object, a third aspect of the present invention provides a control method for a battery power supply system, which is applied to the battery power supply system according to the first aspect of the present invention, and the method includes the following steps: when the power is on, the pre-charging switch is controlled to be closed, and the heating switch and the charging switch are controlled to be disconnected; acquiring voltage between the first power supply line and the second power supply line; and when the voltage between the first power supply line and the second power supply line reaches the pre-charging voltage, controlling the charging switch to be closed and controlling the pre-charging switch to be disconnected.
According to the control method of the battery power supply system provided by the embodiment of the invention, when the battery power supply system is powered on, the pre-charging switch is controlled to be closed, and the heating switch and the charging switch are controlled to be disconnected; acquiring voltage between a first power supply line and a second power supply line; and when the voltage between the first power supply line and the second power supply line reaches the pre-charging voltage, controlling the charging switch to be closed and controlling the pre-charging switch to be disconnected. Therefore, according to the control method of the battery power supply system, the pre-charging circuit and the battery heating assembly multiplex the heating resistor, so that the pre-charging resistor does not need to be arranged independently, the cost can be saved, and the heating resistor has high-power survivability and self temperature protection characteristics, so that the situation that the pre-charging resistor is easily burnt out due to load short circuit or control logic errors can be avoided, the failure rate of the whole vehicle is reduced, and the cost can be reduced.
To achieve the above object, a fourth aspect of the present invention provides a readable storage medium, on which a control program of a battery power supply system is stored, which when executed, implements a control method of the battery power supply system according to the third aspect of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a battery power supply system according to an embodiment of the invention;
FIG. 2 is a block schematic diagram of a battery power supply system according to one embodiment of the present invention;
FIG. 3 is a circuit schematic of a battery powered system according to one embodiment of the present invention;
FIG. 4 is a circuit schematic of a battery powered system according to another embodiment of the present invention;
fig. 5 is a schematic diagram of a characteristic curve of a PTC resistor of a battery power supply system according to an embodiment of the present invention;
FIG. 6 is a pre-charge curve diagram of a PTC resistor of a battery powered system according to one embodiment of the present invention;
FIG. 7 is a pre-charge curve diagram of a PI heating film of a battery powered system according to one embodiment of the present invention;
FIG. 8 is a schematic diagram of a temperature profile of a PI heating film of a battery powered system in accordance with one embodiment of the present invention;
fig. 9 is a schematic current diagram illustrating a charging switch closing instant of the battery power supply system according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a measured pre-charge curve of a battery powered system according to an embodiment of the present invention;
fig. 11 is a schematic circuit diagram of a battery power supply system in the related art;
fig. 12 is a flowchart illustrating a control method of a battery power supply system according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A battery power supply system, a control method thereof, and a vehicle according to an embodiment of the invention are described below with reference to the drawings.
Fig. 1 is a block diagram of a battery power supply system according to an embodiment of the present invention. As shown in fig. 1, the battery power supply system according to the embodiment of the present invention includes a first power supply line 10, a second power supply line 20, a battery pack 30, a battery heating pack 40, a charging switch 50, and a precharge circuit 60.
Wherein, one end of the battery assembly 30 is connected with the first power supply line 10, and the other end of the battery assembly 30 is connected with the second power supply line 20; the battery heating assembly 40 comprises a heating resistor R and a heating switch K3; the charging switch 50 is disposed on the first power supply line 10; the pre-charging circuit 60 is connected in parallel with the charging switch 50, the pre-charging circuit 60 comprises a pre-charging switch K2 and a heating resistor R, one end of the pre-charging switch K2 is connected with one end of the charging switch 50, the other end of the pre-charging switch K2 is connected with one end of the heating resistor R and one end of the heating switch K3, the other end of the heating resistor R is connected with the other end of the charging switch 50, and the other end of the heating switch K3 is connected with the second power supply line 20.
It can be understood that, when the vehicle is powered on, the pre-charge switch K2 can be controlled to be closed, the battery assembly 30 starts pre-charging the high-voltage load equivalent capacitor C between the first power supply line 10 and the second power supply line 20 through the pre-charge switch K2 and the heating resistor R, and when the voltage between the first power supply line 10 and the second power supply line 20, namely the voltage across the high-voltage load equivalent capacitor C, reaches the pre-charge voltage Uc, the pre-charge switch K2 is controlled to be opened, and the pre-charge is ended.
Note that the precharge voltage Uc may be 95% of the rated voltage U of the battery assembly 30, that is, Uc is 95% U.
According to one embodiment of the invention, the heating resistor R may be a PTC resistor or a PI heating film. In particular, the PTC resistor may be a ceramic PTC heater. The heating switch K3 and the pre-charge switch K2 may be relays.
According to one embodiment of the present invention, only one of the pre-charge switch K2 and the heat switch K3 is closed at the same time.
It can be understood that, as shown in fig. 3, at the time of power-on of the vehicle, the precharge switch K2 is controlled to be closed, and the heating switch K3 is controlled to be opened, the battery assembly 30 starts precharging the high-voltage load equivalent capacitor C through the precharge switch K2 and the heating resistor R, and when the voltage between the first power supply line 10 and the second power supply line 20 reaches the precharge voltage Uc, that is, 95% of the rated voltage U of the battery assembly 30, the precharge switch K2 is controlled to be opened, and at this time, the heating switch K3 is controlled to be closed according to the battery heating request.
Further, according to an embodiment of the present invention, the pre-charge switch K2 is closed before the heat switch K3.
It can be understood that at the moment of vehicle power-on, the generated impact current is very large, and the damage to the battery power supply system is very large, therefore, the high-voltage load equivalent capacitor C should be pre-charged first to reduce the impact current when the vehicle is powered on. Therefore, when the vehicle is powered on, the pre-charge switch K2 should be controlled to be closed first, the battery assembly 30 starts to pre-charge the high-voltage load equivalent capacitor C through the pre-charge switch K2 and the heating resistor R, when the voltage between the first power supply line 10 and the second power supply line 20 reaches the pre-charge voltage Uc, that is, 95% of the rated voltage U of the battery assembly 30, the pre-charge switch K2 is controlled to be opened, and the heating switch K3 is controlled to be closed according to the battery heating request.
According to one embodiment of the present invention, as shown in fig. 2, the 50 battery power supply system further comprises: the control module 70 is connected with the heating switch K3, the pre-charging switch K2 and the charging switch 50, and when the control module 70 is powered on, the control module controls the pre-charging switch K2 to be closed, and controls the heating switch K3 and the charging switch 50 to be opened, until the voltage between the first power supply line 10 and the second power supply line 20 reaches the pre-charging voltage Uc, the control module 70 controls the charging switch 50 to be closed, and controls the pre-charging switch K2 to be opened. The charging switch 50 may be a relay.
Further, according to an embodiment of the present invention, the control module 70 is further configured to control the heating switch K3 to be closed according to the battery heating request after the pre-charge switch K2 is opened.
It can be understood that, during power up, the control module 70 controls the pre-charge switch K2 to be closed and controls the charging switch 50 to be opened, the battery assembly 30 starts to pre-charge the high-voltage load equivalent capacitor C through the pre-charge switch K2 and the heating resistor R, at this time, the heating resistor R plays a role of a pre-charge resistor until the voltage between the first power supply line 10 and the second power supply line 20 reaches the pre-charge voltage Uc, that is, 95% of the rated voltage U of the battery assembly 30 is reached, the pre-charge is finished, the control module 70 controls the pre-charge switch K2 to be opened and controls the charging switch 50 to be closed, at this time, the heating resistor R recovers the battery heating function, and when heating is required during the charging process of the battery pack, that is, the heating switch K3 is controlled to be closed.
It should be noted that the pre-charging process and the battery heating process have a certain timing sequence in the overall vehicle control strategy, that is, pre-charging is performed first when the vehicle is powered on, and the battery is heated according to the battery heating request after the pre-charging is completed, so that the pre-charging circuit 60 can reuse the heating resistor R in the battery heating assembly 40. And the PTC resistor or the PI heating film is used as the heating resistor R, so that the pre-charging resistor can be saved, the cost is reduced, the problem that the pre-charging resistor is easily burnt out is solved, and the failure modes of the vehicle are reduced. In addition, the relay is adopted to control the battery heater, and the control logic is simple.
In the embodiment of the invention, the heating resistor can be selected from a PTC resistor or a PI heating film.
Specifically, it is understood that the power of the motor in a vehicle such as an electric car may be in the range of several tens kW to several hundreds kW, and the peak power of the PTC resistor may be in the range of 6kW, so that the PTC resistor may be used as a heating resistor, and the PTC resistor has advantages of a wide range of use voltage, a long life, being not easily burned by overload, safety, reliability, and the like.
In addition, when precharging, the use of the PTC resistor as the heating resistor can prevent voltage breakdown from occurring. During the pre-charging process, the operating current flowing through the PTC resistor is smaller than the operating current flowing through the PTC resistor, which is considered to be a current flowing through the PTC resistor to cause the self-heating temperature rise of the PTC resistor to exceed the curie temperature of the PTC resistor, that is, within the range of the no-operating current of the PTC resistor, which is considered to be a current flowing through the PTC resistor to cause the self-heating temperature rise of the PTC resistor to exceed the curie temperature of the PTC resistor.
Fig. 5 and 6 show a characteristic curve L1 and a pre-charge curve of the PTC resistor, respectively, where the pre-charge curve of the PTC resistor includes a voltage curve L2 and a current curve L3, as shown in fig. 6, it can be seen from fig. 6 that the pre-charge curve of the PTC resistor is fast and slow, so that the time when the voltage between the first power supply line 10 and the second power supply line 20 reaches the pre-charge voltage Uc, that is, the time at point a in the graph increases, where the pre-charge time can be controlled to be about 1s, and the point B shows the corresponding current when the voltage between the first power supply line 10 and the second power supply line 20 reaches the pre-charge voltage Uc.
The precharging curve of the general fixed-value resistor is shown in fig. 7, wherein, as shown in fig. 7, the precharging curve of the general fixed-value resistor includes a voltage curve L5 and a current curve L6, where point C represents that the voltage between the first power supply line 10 and the second power supply line 20 reaches the precharge voltage Uc, point D represents the corresponding current when the voltage between the first power supply line 10 and the second power supply line 20 reaches the precharge voltage Uc, the PI heating film is a flexible pure resistance heater, the electrical performance of which is consistent with that of the general fixed-value resistor, except that the PI heating film can bear more power according to the battery heating power demand and is not burned out due to control logic error or load short circuit, and the temperature characteristic curve L4 of the PI heating film is shown in fig. 8.
For example, when a device in the load circuit is short-circuited, as shown in fig. 4, the load resistor R2 is equivalently connected in series in the loop, and when the pre-charge switch K2 is closed, the load resistor R2 and the heating resistor R may form a series loop, so that the voltage between the first power line 10 and the second power line 20 cannot reach the pre-charge voltage Uc within a preset pre-charge time, for example, 1.2s, and the common constant-value heating resistor cannot undertake the pre-charge for a long time, thereby causing the heating resistor to be burned out, and the pre-charge to fail. The PTC resistor or the PI heating film can work for a long time and has an over-temperature automatic protection function, so that the possibility of over-power damage is avoided in the pre-charging process.
In addition, when the pre-charge logic fails, the load end works in advance during the pre-charge process, and the voltage between the first power supply line 10 and the second power supply line 20 cannot reach the pre-charge voltage Uc within a preset pre-charge time, for example, 1.2s, the use of the common constant value resistor as the heating resistor may cause the pre-charge failure and burn out the heating resistor, and the use of the PTC resistor or the PI heating film as the heating resistor may prevent the pre-charge failure.
After the pre-charging is finished, the function of the PTC resistor as the pre-charging resistor is finished, and the function of the PTC heater is recovered, that is, the pre-charging and the battery heating are not performed at the same time sequence, and the battery heating function can be recovered after the pre-charging is finished, so that the heating function of the PTC heating resistor is not influenced by the multiplexing of the PTC heating resistor. Therefore, the pre-charging circuit 60 and the battery heating assembly 40 multiplex the heating resistor R, the cost can be saved, and meanwhile, the PTC resistor or the PI heating film is used as the heating resistor R, so that the situation that the heating resistor is burnt out due to short circuit of a load end or control logic errors can be avoided, and the failure rate of the whole vehicle is reduced.
For example, as shown in fig. 3, the relationship between the pre-charge voltage Uc, the rated voltage U of the battery assembly 30, the heating resistor R, the high-voltage load equivalent capacitor C, and the pre-charge time T is as follows:
Uc1＝U1*(1-e-T/R1C1) (1)
wherein Uc1 is the magnitude of the pre-charge voltage Uc, U1 is the magnitude of the rated voltage U of the battery assembly 30, R1 is the resistance value of the heating resistor R, C1 is the capacitance value of the high-voltage load equivalent capacitor C, and T is the pre-charge time.
The relation among the pre-charging current Ir, the voltage U of the battery assembly 30, the heating resistor R, the high-voltage load equivalent capacitor C, and the pre-charging time T is as follows:
Ir1＝U1/R1*e-T/R1C1 (2)
wherein, Ir1 is the magnitude of the pre-charging current Ir, U1 is the magnitude of the voltage U of the battery assembly 30, R1 is the resistance of the heating resistor R, C1 is the capacitance of the high-voltage load equivalent capacitor C, and T is the pre-charging time.
Taking the heating resistor R as the PTC resistor, the precharge power is 2KW, the size U1 of the rated voltage U of the battery pack is 500V, and the capacitance C1 of the high-voltage load equivalent capacitor C is 1000Uf as an example, during the precharge process, the average resistance of the PTC resistor is estimated to be 300 Ω, and when the voltage Uc across the high-voltage load equivalent capacitor C is precharged to 95% of the rated voltage U of the battery pack 30, the precharge time T can be calculated by the formula (1), that is:
0.95＝1-e-T/R1C1
T＝-ln(0.05)*R1C1＝0.9s
it will be appreciated that the magnitude of the pre-charge time T determines the speed at which the vehicle is powered up, wherein the pre-charge time T can be controlled to within 1.2s, so that the above calculation results meet the requirements.
In addition, as shown in fig. 10, where L7 is a charging voltage waveform and L8 is a current waveform, the experimental result shows that when the voltage Uc across the high-voltage load equivalent capacitor C is precharged to 95% of the rated voltage U of the battery assembly 30, i.e., point E in the figure, the precharge time T is 0.85s, that is, the actual data does not greatly differ from the theoretical calculation result.
The test result also shows that, as shown in fig. 9, where L9 is a charging voltage waveform, L10 is a current waveform, when the pre-charging voltage Uc reaches 95% of the rated voltage U of the battery assembly 30, i.e., a2 point in the diagram, the charging switch 50 is controlled to be closed, and the current generated at the moment of actuation of the charging switch 50 is affected by parameters such as voltage difference, line parasitic inductance, capacitance ESR, etc., and is actually measured as Imax32A, in safe range. Therefore, the battery power supply system provided by the embodiment of the invention can effectively inhibit the impact current at the moment of attracting the charging switch 50, and avoid burning out the contactor and the main loop safety.
After the charging switch 50 is closed, the pre-charging switch K2 is turned off, at this time, the pre-charging circuit 60 can safely exit the high-voltage circuit, the high-voltage power-on operation is finished, the PTC resistor returns to the normal operation standby state, that is, when the battery pack needs to be heated in the charging process, the heating switch K3 is controlled to be closed, and the battery heating is started.
In summary, according to the battery power supply system provided by the embodiment of the invention, the pre-charging circuit and the battery heating assembly multiplex the heating resistor, so that the pre-charging resistor does not need to be separately arranged, the cost can be saved, and the heating resistor has high-power survivability and self temperature protection characteristics, so that the situation that the pre-charging resistor is easily burnt out due to load short circuit or control logic error can be avoided, the failure rate of the whole vehicle is reduced, and the cost can be reduced.
Based on the battery power supply system of the above embodiment, an embodiment of the present invention further provides a vehicle, including the battery power supply system.
According to the vehicle provided by the embodiment of the invention, the heating resistor is multiplexed by the pre-charging circuit and the battery heating component through the arranged battery power supply system, so that the pre-charging resistor does not need to be arranged independently, the cost can be saved, and the heating resistor has high-power survivability and self temperature protection characteristics, so that the condition that the pre-charging resistor is easily burnt out due to load short circuit or control logic error can be avoided, the failure rate of the whole vehicle is reduced, and the cost can be reduced.
Based on the battery power supply system of the above embodiment, the embodiment of the present invention further provides a control method of the battery power supply system, which is applied to the battery power supply system.
Fig. 12 is a flowchart illustrating a control method of a battery power supply system according to an embodiment of the invention. As shown in fig. 12, the control method of the battery power supply system according to the embodiment of the present invention includes the steps of:
and S1, controlling the pre-charging switch to be closed and controlling the heating switch and the charging switch to be disconnected when the power is on.
And S2, acquiring the voltage between the first power supply line and the second power supply line.
And S3, controlling the charging switch to be closed and controlling the pre-charging switch to be opened when the voltage between the first power supply line and the second power supply line reaches the pre-charging voltage.
According to an embodiment of the present invention, the control method of the battery power supply system further includes: and after the pre-charging switch is switched off, controlling the heating switch to be switched on according to the battery heating request.
It should be noted that the foregoing explanation of the embodiment of the battery power supply system is also applicable to the control method of the battery power supply system according to the embodiment of the present invention, and details are not described here.
In summary, according to the control method of the battery power supply system provided by the embodiment of the invention, when the battery is powered on, the pre-charging switch is controlled to be closed, and the heating switch and the charging switch are controlled to be disconnected; acquiring voltage between a first power supply line and a second power supply line; and when the voltage between the first power supply line and the second power supply line reaches the pre-charging voltage, controlling the charging switch to be closed and controlling the pre-charging switch to be disconnected. Therefore, according to the control method of the battery power supply system, the pre-charging circuit and the battery heating assembly multiplex the heating resistor, so that the pre-charging resistor does not need to be arranged independently, the cost can be saved, and the heating resistor has high-power survivability and self temperature protection characteristics, so that the situation that the pre-charging resistor is easily burnt out due to load short circuit or control logic errors can be avoided, the failure rate of the whole vehicle is reduced, and the cost can be reduced.
Based on the control method of the battery power supply system in the foregoing embodiment, an embodiment of the present invention further provides a readable storage medium, on which a control program of the battery power supply system is stored, and when the program is executed, the control method of the battery power supply system is implemented.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A battery power supply system, comprising:
a first power supply line and a second power supply line;
one end of the battery component is connected with the first power supply circuit, and the other end of the battery component is connected with the second power supply circuit;
the battery heating assembly comprises a heating resistor and a heating switch;
the charging switch is arranged on the first power supply line;
the pre-charging circuit is connected with the charging switch in parallel, the pre-charging circuit comprises a pre-charging switch and the heating resistor, one end of the pre-charging switch is connected with one end of the charging switch, the other end of the pre-charging switch is connected with one end of the heating resistor and one end of the heating switch, the other end of the heating resistor is connected with the other end of the charging switch, and the other end of the heating switch is connected with the second power supply line.
2. The battery-powered system of claim 1, wherein only one of the pre-charge switch and the warm-up switch is closed at the same time.
3. The battery powered system of claim 1, wherein the pre-charge switch is closed prior to the heat switch.
4. The battery power supply system of claim 1, further comprising:
the control module is connected with the heating switch, the pre-charging switch and the charging switch, and is used for controlling the pre-charging switch to be closed and controlling the heating switch and the charging switch to be disconnected when the power is on, and controlling the charging switch to be closed and controlling the pre-charging switch to be disconnected when the voltage between the first power supply line and the second power supply line reaches the pre-charging voltage.
5. The battery power supply system of claim 4, wherein the control module is further configured to control the heating switch to close according to a battery heating request after the pre-charge switch is opened.
6. The battery power supply system of claim 1, wherein the heating resistor is a PTC resistor or a PI heating film, and the heating switch and the pre-charge switch are relays.
7. A vehicle, characterized in that it comprises a battery power supply system according to any one of claims 1-6.
8. A control method for a battery power supply system, applied to the battery power supply system according to any one of claims 1 to 6, comprising the steps of:
when the power is on, the pre-charging switch is controlled to be closed, and the heating switch and the charging switch are controlled to be disconnected;
acquiring voltage between the first power supply line and the second power supply line;
and when the voltage between the first power supply line and the second power supply line reaches the pre-charging voltage, controlling the charging switch to be closed and controlling the pre-charging switch to be disconnected.
9. The control method of a battery power supply system according to claim 8, characterized by further comprising:
and after the pre-charging switch is switched off, controlling the heating switch to be switched on according to a battery heating request.
10. A readable storage medium, characterized in that a control program of a battery power supply system is stored thereon, which when executed, implements the control method of the battery power supply system according to claim 8 or 9.
CN201910804414.2A 2019-08-28 2019-08-28 Battery power supply system, control method thereof and vehicle Pending CN112440745A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910804414.2A CN112440745A (en) 2019-08-28 2019-08-28 Battery power supply system, control method thereof and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910804414.2A CN112440745A (en) 2019-08-28 2019-08-28 Battery power supply system, control method thereof and vehicle

Publications (1)

Publication Number Publication Date
CN112440745A true CN112440745A (en) 2021-03-05

Family

ID=74741856

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910804414.2A Pending CN112440745A (en) 2019-08-28 2019-08-28 Battery power supply system, control method thereof and vehicle

Country Status (1)

Country Link
CN (1) CN112440745A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103847531A (en) * 2012-11-28 2014-06-11 北汽福田汽车股份有限公司 Electric car high-voltage electrical system and control method thereof
CN104901355A (en) * 2015-04-14 2015-09-09 北汽福田汽车股份有限公司 Pre-charging device and method of electric automobile
CN105790396A (en) * 2014-12-22 2016-07-20 比亚迪股份有限公司 Electric automobile, charge control method thereof and charging system thereof
CN207156946U (en) * 2017-08-04 2018-03-30 北京新能源汽车股份有限公司 The power supply circuit and electric automobile of electric automobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103847531A (en) * 2012-11-28 2014-06-11 北汽福田汽车股份有限公司 Electric car high-voltage electrical system and control method thereof
CN105790396A (en) * 2014-12-22 2016-07-20 比亚迪股份有限公司 Electric automobile, charge control method thereof and charging system thereof
CN104901355A (en) * 2015-04-14 2015-09-09 北汽福田汽车股份有限公司 Pre-charging device and method of electric automobile
CN207156946U (en) * 2017-08-04 2018-03-30 北京新能源汽车股份有限公司 The power supply circuit and electric automobile of electric automobile

Similar Documents

Publication Publication Date Title
KR101755210B1 (en) Electric actuator with pre-heating
KR101551088B1 (en) Apparatus and Method for detecting fault of battery heating system and relay
KR101551068B1 (en) Stable power supply device for high voltage battery system
CN102084574B (en) For the circuit of the voltage stabilization of onboard power system
KR101273820B1 (en) Power supply device
EP2774798B1 (en) Battery management system and driving method thereof
CN101479919B (en) Method and device for charging an electrical energy storage element, in particular an ultracapacitor
US9211800B2 (en) Battery system and control method of battery system
JP5127387B2 (en) Power supply for vehicle
JP4086807B2 (en) Power supply for vehicle
US8994208B2 (en) Backup power for overvoltage protection for electric vehicle
CN104659442A (en) Battery temperature raising system and control method thereof
WO2007116530A1 (en) Power storage system
KR102308374B1 (en) Secondary battery discharging system and method thereof
CN111525656B (en) Battery electric energy feedback system and vehicle
US20220227256A1 (en) Vehicle traction battery circuit and control system
CN111916852A (en) Power battery system capacitor pre-charging circuit and method, vehicle and storage medium
KR20180068370A (en) Pre-charge method and system for high voltage link capacitor of vehicle
CN211075606U (en) Electric automobile pre-charging system
CN112440745A (en) Battery power supply system, control method thereof and vehicle
CN110816311B (en) Method for operating a battery system and electric vehicle
CN109624786B (en) Power battery pre-charging resistor protection control method
CN112255577A (en) Method and system for detecting contactor adhesion
JP2021118629A (en) Vehicle battery control device
CN114552753A (en) On-vehicle backup control device and on-vehicle backup device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20210305