CN110103850B - Battery system for preventing vehicle-mounted low-voltage power supply from power shortage - Google Patents
Battery system for preventing vehicle-mounted low-voltage power supply from power shortage Download PDFInfo
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- CN110103850B CN110103850B CN201910374129.1A CN201910374129A CN110103850B CN 110103850 B CN110103850 B CN 110103850B CN 201910374129 A CN201910374129 A CN 201910374129A CN 110103850 B CN110103850 B CN 110103850B
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/66—Arrangements of batteries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or 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
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a battery system for preventing a vehicle-mounted low-voltage power supply from power shortage, which comprises a high-voltage battery system, a DC/DC converter, a low-voltage power supply and a low-voltage power supply emergency power supply system, wherein the high-voltage battery system is electrically connected with the DC/DC converter; the emergency power supply system of the low-voltage power supply is respectively electrically connected with the high-voltage battery system and the low-voltage power supply, the emergency power supply system of the low-voltage power supply is in a disconnected state when the power battery module works, and the emergency power supply system of the low-voltage power supply is in a connected state when the power battery module does not work and the low-voltage power supply is insufficient. A plurality of electric cores are connected out of the power battery module to serve as an emergency power supply battery pack, and the connection or disconnection of the emergency power supply system of the low-voltage power supply is controlled to prevent the vehicle from being started due to the fact that the low-voltage power supply is insufficient.
Description
Technical Field
The invention relates to the field of power supply of electric automobiles, in particular to a battery system for preventing a vehicle-mounted low-voltage power supply from power shortage.
Background
The existing new energy electric automobile generally has a high-voltage system and a low-voltage system, and the low-voltage system supplies power for low-voltage equipment of the automobile. When the low-voltage battery is self-discharged, the electric equipment works for a long time without being charged, or the low-voltage battery is damaged, the low-voltage battery can lose the power. The phenomenon of damaging the coating of the polar plate of the storage battery is caused by forced overdischarge when the battery is insufficient in electricity and low in voltage.
The power battery needs to be supplied with low voltage system 12V electricity by the low voltage power supply in the general design, activation BMS (battery management system) control, power battery inserts the return circuit, driving motor, though generally be equipped with DC/DC converter (direct current voltage converter) on the vehicle, can make the vehicle use by power battery for low voltage power supply charging, guarantee that low voltage power supply's electric quantity is sufficient, but there is the low voltage power supply under the condition that power battery does not work insufficient voltage, power battery can't start at all, can't drive DC/DC converter (direct current voltage converter) more, thereby lead to the vehicle to lie prone the nest completely, can't use.
Conventionally, a prevent insufficient voltage in-vehicle device (201810278573.9) that insufficient voltage in-vehicle device provided for electric automobile, utilize on-vehicle terminal and voltage measurement appearance to detect the voltage of low voltage battery and feed back to battery management system, battery management system is according to the condition of voltage, converts high-pressure power battery into the low pressure and gives the low voltage battery, charges for the low voltage battery, and power management system can cut off like illumination, audio and video and air conditioning circuit simultaneously, prevents that the low voltage battery from not being sufficient in power again after charging.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a battery system for preventing a vehicle-mounted low-voltage power supply from being insufficient.
In order to achieve the above object, the present invention provides a battery system for preventing a vehicle-mounted low-voltage power supply from power shortage, comprising a high-voltage battery system, a DC/DC converter, a low-voltage power supply and a low-voltage power supply emergency power supply system, wherein the high-voltage battery system is electrically connected to the DC/DC converter, the DC/DC converter is electrically connected to the low-voltage power supply, the high-voltage battery system comprises a power battery module, and the power battery module is converted into low voltage by the DC/DC converter to charge the low-voltage power supply; the emergency power supply system of the low-voltage power supply is respectively connected with the high-voltage battery system and the low-voltage power supply, the power battery module works, the emergency power supply system of the low-voltage power supply is in a disconnection state, the power battery module does not work and the low-voltage power supply is insufficient, and the emergency power supply system of the low-voltage power supply is in a connection state.
Further, the high-voltage battery system further comprises a Hall current sensor, a battery management system and a total negative relay, the negative electrode of the power battery module is electrically connected with one end of the Hall current sensor, the other end of the Hall current sensor is electrically connected with the total negative relay, and the battery management system is respectively electrically connected with the Hall current sensor, the total negative relay and the low-voltage power supply.
Furthermore, the battery management system is electrically connected with the low-voltage power supply through a low-voltage connector.
Furthermore, the battery management system is electrically connected with the master negative relay through a master negative relay control line.
Furthermore, the emergency power supply system of the low-voltage power supply comprises an emergency power supply battery pack, an emergency standby two-core connector, a normally closed relay, a reset switch and an auxiliary contact relay, wherein the emergency power supply battery pack is at least one group of battery cells in the power battery module, the battery cells are connected with the positive input end of the emergency standby two-core connector through 12V + wiring harnesses, and the negative input end of the emergency standby two-core connector is connected between the Hall current sensor and the main negative relay through 12V-wiring harnesses; the negative output end of the emergency standby two-core connector is electrically connected with the negative electrode of the low-voltage power supply, the positive output end of the emergency standby two-core connector is connected with the positive electrode cell of the low-voltage power supply sequentially through the normally closed relay and the auxiliary contact relay, and the reset switch is connected with two ends of the load end of the auxiliary contact relay in parallel.
Furthermore, the negative output end of the emergency standby two-core connector is electrically connected with the negative electrode of the low-voltage power supply through a rectifier diode.
Further, the low voltage connector is respectively provided with a normally closed relay control line, an auxiliary contact signal output line, an auxiliary contact signal input line, a DC/DC converter state monitoring line, a vehicle-mounted 12V-power supply line and a vehicle-mounted 12V + power supply line, the normally closed relay is connected with the battery management system through the normally closed relay control line, the auxiliary contact relay is respectively connected with the battery management system through the auxiliary contact signal output line and the auxiliary contact signal input line, the DC/DC converter is connected with the battery management system through the DC/DC converter state monitoring line, and the low voltage power supply is respectively connected with the battery management system through the vehicle-mounted 12V-power supply line and the vehicle-mounted 12V + power supply line.
Further, prevent battery system of on-vehicle low-voltage power supply insufficient voltage still includes control system, control system is used for switching on or breaking low-voltage power supply emergency power supply system.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, a plurality of electric cores are reserved in the power battery module to serve as the battery pack of the low-voltage power supply emergency power supply system, and meanwhile, the control system is used for controlling the connection or disconnection of the low-voltage power supply emergency power supply system so as to prevent the vehicle from being incapable of starting due to the power shortage of the low-voltage power supply.
2. According to the invention, the low-voltage power supply emergency power supply system is switched on by pressing the reset switch to supply power to the low-voltage power supply, so that the self-starting of the vehicle is completed, and the operation is convenient and fast.
3. The negative output end of the emergency standby two-core connector is electrically connected with the negative electrode of the low-voltage power supply through the rectifier diode, the low-voltage power supply emergency power supply system does not directly charge the low-voltage power supply, and the electric core in the power battery module is prevented from charging the vehicle-mounted 12V power supply, so that the electric core in the power battery module is prevented from being excessively consumed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of the electrical principle of the battery system for preventing the vehicle-mounted low-voltage power supply from being lack of power.
Fig. 2 is a flow chart of a battery system control system for preventing the vehicle-mounted low-voltage power supply from power shortage.
The above reference numerals:
1. a high voltage battery system; 11. a power battery module; 12. a Hall current sensor; 13. a battery management system; 14. a total negative relay; 2. a DC/DC converter; 3. a low voltage power supply; 4. a low-voltage power supply emergency power supply system; 41. an emergency power supply battery pack; 42. emergency two-core connector; 43. a normally closed relay; 44. a reset switch; 45. an auxiliary contact relay; 5. a low voltage connector; 6. a master negative relay control line; 7. and a rectifying diode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention is further described below with reference to the following figures and specific embodiments:
referring to fig. 1, the invention provides a battery system for preventing a vehicle-mounted low-voltage power supply from power shortage, which comprises a high-voltage battery system 1, a DC/DC converter 2, a low-voltage power supply 3 and a low-voltage power supply emergency power supply system 4, wherein the high-voltage battery system 1 is electrically connected with the DC/DC converter 2, the DC/DC converter 2 is electrically connected with the low-voltage power supply 3, the high-voltage battery system 1 comprises a power battery module 11, and the power battery module 11 is converted into low voltage power through the DC/DC converter 2 to charge the low-voltage power supply 3; the emergency power supply system 4 of the low-voltage power supply is respectively electrically connected with the high-voltage battery system 1 and the low-voltage power supply 3, the emergency power supply system 4 of the low-voltage power supply is in a cut-off state when the power battery module 11 works, and the emergency power supply system 4 of the low-voltage power supply is in a switch-on state when the power battery module 11 does not work and the low-voltage power supply 3 is in power shortage.
Referring to fig. 1, the high voltage battery system 1 further includes a hall current sensor 12, a battery management system 13 and a total negative relay 14, the negative electrode of the power battery module 11 is electrically connected to one end 12 of the hall current sensor, the other end of the hall current sensor 12 is electrically connected to the total negative relay 14, and the battery management system 13 is electrically connected to the hall current sensor 12, the total negative relay 14 and the low voltage power supply 3, respectively.
Preferably, the battery management system 13 is electrically connected to the low-voltage power supply 3 through the low-voltage connector 5.
Preferably, the battery management system 13 is electrically connected to the master negative relay 14 via the master negative relay control line 6.
Referring to fig. 1, the low-voltage power supply emergency power supply system 4 includes an emergency power supply battery pack 41, an emergency standby two-core connector 42, a normally closed relay 43, a reset switch 44 and an auxiliary contact relay 45, wherein the emergency power supply battery pack 41 is at least one group of battery cells in the power battery module 11, as a preferred embodiment, 3 groups of battery cells from the total negative of the power battery module 11 are connected with the positive input end of the emergency standby two-core connector 42 through a 12V + wiring harness, the negative input end of the emergency standby two-core connector 42 is connected between the hall current sensor 12 and the total negative relay 14 through a 12V-wiring harness, and 3 groups of battery cells from the total negative are used as the emergency power supply battery pack 41; the negative output end of the emergency standby two-core connector 42 is electrically connected with the negative electrode of the low-voltage power supply 3, the positive output end of the emergency standby two-core connector 42 is connected with the positive electrode cell of the low-voltage power supply 3 sequentially through the normally closed relay 43 and the auxiliary contact relay 45, and the two ends of the load end of the reset switch 44 and the auxiliary contact relay 45 are connected in parallel.
Preferably, the negative output end of the emergency two-core connector 42 is electrically connected to the negative electrode of the low-voltage power supply 3 through the rectifier diode 7, and the low-voltage power supply emergency power supply system 4 does not directly charge the low-voltage power supply 3, so as to prevent the electric core in the power battery module 11 from charging the vehicle-mounted 12V power supply, which causes the electric core in the power battery module 11 to consume too much.
Referring to fig. 1, the low voltage connector 5 is respectively provided with a normally closed relay control line, an auxiliary contact signal output line, an auxiliary contact signal input line, a DC/DC converter state monitoring line, a vehicle-mounted 12V-power supply line and a vehicle-mounted 12V + power supply line, the normally closed relay 43 is connected with the battery management system 13 through the normally closed relay control line, the auxiliary contact relay 45 is connected with the battery management system 13 through the auxiliary contact signal output line and the auxiliary contact signal input line, the DC/DC converter 2 is connected with the battery management system 13 through the DC/DC converter state monitoring line, and the low voltage power supply 3 is connected with the battery management system 13 through the vehicle-mounted 12V-power supply line and the vehicle-mounted 12V + power supply line.
Preferably, the battery system for preventing the vehicle-mounted low-voltage power supply from being insufficient in power further comprises a control system, the control system is used for switching on or switching off the low-voltage power supply emergency power supply system 4, and the action flow of the specific vehicle-mounted low-voltage power supply insufficient-power self-starting type power battery system refers to fig. 2.
In the using process, if the condition that the whole vehicle cannot be started due to power shortage of the vehicle-mounted low-voltage power supply 3 occurs, the reset switch 44 is pressed, the emergency power supply battery pack 41 supplies power to the auxiliary contact relay 45 through the 12V + lead and the 12V-lead, the auxiliary contact relay 45 is closed, the reset switch 44 automatically resets and is switched off, self-locking of the auxiliary contact relay 45 is completed, the low-voltage power supply emergency power supply system 4 is switched on to supply power to the battery management system 13, the emergency power supply mode is started, the main negative relay 14 is closed, the high-voltage battery system 1 is connected and activates the DC/DC converter 2, 12V low-voltage power is output, and vehicle starting is completed.
After the vehicle is started, the battery management system 13 detects that the DC/DC converter 2 outputs 12V + voltage, the normally closed relay 43 is turned off, so that the self-locking of the auxiliary contact relay 45 is released, the auxiliary contact relay 45 is turned off, the emergency power supply battery pack 41 stops supplying power to the low-voltage power supply 3, and finally the control of the normally closed relay 43 is released.
It should be noted that after the vehicle is started, the battery system for preventing the vehicle-mounted low-voltage power supply from power shortage automatically calculates the power consumption in the emergency power supply mode under the action of the control system 8, subsequently starts the battery management system 13 to balance the function and supplement the consumed power, so as to ensure the consistency among the battery cores in the power battery module 11, after the auxiliary contact relay 45 is closed, the battery management system 13 detects that the auxiliary contact of the auxiliary contact relay 45 is closed, the emergency power supply mode is entered, the Hall current sensor 12 collects current, the ampere-hour integration method is used for calculating the power consumption in the emergency power supply mode, when the auxiliary contact relay 45 is turned off, the emergency power supply mode is exited, the battery management system 13 starts the battery equalization function, the cell as the emergency power supply battery pack 41 is charged for a time equal to the power consumption in the emergency power supply mode divided by the equalizing current of the battery management system 13.
In the absence of power shortage, the reset switch 44 is touched by mistake, and the battery system for preventing the vehicle-mounted low-voltage power supply from power shortage automatically cuts off the normally closed relay 43 under the action of the control system 8, so that the low-voltage power supply emergency power supply system 4 is in an off state.
The foregoing is a detailed description of the invention, and specific examples are used herein to explain the principles and implementations of the invention, the above description being merely intended to facilitate an understanding of the principles and core concepts of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (4)
1. A battery system for preventing the vehicle-mounted low-voltage power supply from power shortage is characterized by comprising a high-voltage battery system, a DC/DC converter, a low-voltage power supply and a low-voltage power supply emergency power supply system, wherein the high-voltage battery system is electrically connected with the DC/DC converter, the DC/DC converter is electrically connected with the low-voltage power supply,
the high-voltage battery system comprises a power battery module, a Hall current sensor, a battery management system and a total negative relay, wherein the power battery module is converted into low voltage through a DC/DC converter to charge a low-voltage power supply; the battery management system is electrically connected with the low-voltage power supply through a low-voltage connector;
the emergency power supply system of the low-voltage power supply comprises an emergency power supply battery pack, an emergency standby two-core connector, a normally closed relay, a reset switch and an auxiliary contact relay, wherein the emergency power supply battery pack is at least one group of battery cells in a power battery module, the battery cells are connected with the positive input end of the emergency standby two-core connector through 12V + wiring harnesses, and the negative input end of the emergency standby two-core connector is connected between a Hall current sensor and a main negative relay through 12V-wiring harnesses; the negative output end of the emergency standby two-core connector is electrically connected with the negative electrode of the low-voltage power supply, the positive output end of the emergency standby two-core connector is connected with the positive electrode cell of the low-voltage power supply sequentially through the normally closed relay and the auxiliary contact relay, and the reset switch is connected with two ends of the load end of the auxiliary contact relay in parallel; the negative output end of the emergency standby two-core connector is electrically connected with the negative electrode of the low-voltage power supply through a rectifier diode;
the low-voltage power supply emergency power supply system is electrically connected with the high-voltage battery system and the low-voltage power supply respectively, and is in a disconnected state when the power battery module works;
when the power battery module is out of work and the low-voltage power supply is insufficient, the low-voltage power supply emergency power supply system is in a switch-on state.
2. The vehicle-mounted low-voltage power supply power shortage prevention battery system according to claim 1, wherein the low-voltage connectors are respectively provided with a normally closed relay control line, an auxiliary contact signal output line, an auxiliary contact signal input line, a DC/DC converter state monitoring line, a vehicle-mounted 12V-power supply line and a vehicle-mounted 12V + power supply line.
3. The battery system of claim 2, wherein the normally closed relay is connected to the battery management system through a normally closed relay control line, the auxiliary contact relay is connected to the battery management system through an auxiliary contact signal output line and an auxiliary contact signal input line, the DC/DC converter is connected to the battery management system through a DC/DC converter status monitor line, and the low voltage power source is connected to the battery management system through an on-board 12V-power supply line and an on-board 12V + power supply line.
4. The vehicle low-voltage power supply power shortage prevention battery system according to claim 1, further comprising a control system for switching on or off the low-voltage power supply emergency power supply system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910374129.1A CN110103850B (en) | 2019-05-07 | 2019-05-07 | Battery system for preventing vehicle-mounted low-voltage power supply from power shortage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910374129.1A CN110103850B (en) | 2019-05-07 | 2019-05-07 | Battery system for preventing vehicle-mounted low-voltage power supply from power shortage |
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| CN110103850A CN110103850A (en) | 2019-08-09 |
| CN110103850B true CN110103850B (en) | 2021-11-05 |
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| CN201910374129.1A Active CN110103850B (en) | 2019-05-07 | 2019-05-07 | Battery system for preventing vehicle-mounted low-voltage power supply from power shortage |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113183898B (en) * | 2021-05-06 | 2023-05-12 | 重庆长安汽车股份有限公司 | Device and method for preventing power shortage caused by excessive dark current and vehicle |
| CN114050370A (en) * | 2021-11-11 | 2022-02-15 | 合众新能源汽车有限公司 | Battery module, power battery, electric vehicle and electric vehicle emergency electricity taking method |
| CN114537146B (en) * | 2022-04-25 | 2022-08-23 | 潍柴动力股份有限公司 | Vehicle control method and device, electronic equipment and storage medium |
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