CN111231671A - Insufficient voltage prevention system for storage battery of electric automobile - Google Patents
Insufficient voltage prevention system for storage battery of electric automobile Download PDFInfo
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- CN111231671A CN111231671A CN202010151104.8A CN202010151104A CN111231671A CN 111231671 A CN111231671 A CN 111231671A CN 202010151104 A CN202010151104 A CN 202010151104A CN 111231671 A CN111231671 A CN 111231671A
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- storage battery
- battery
- current
- power
- power supply
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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
Abstract
The invention relates to a power shortage prevention system for an electric automobile storage battery, which comprises: the system comprises a storage battery, a power battery, a vehicle control unit, a battery management system, a storage battery energy management controller, a current sensor and a direct current-to-direct current power supply exchanger; the direct-current-to-direct-current power supply exchanger is respectively connected with a power battery and a storage battery and used for converting the voltage output by the power battery into the voltage required by the storage battery, the current sensor is installed on a loop of the storage battery and the direct-current-to-direct-current power supply exchanger, the storage battery energy management controller is respectively connected with the current sensor and the vehicle control unit and receives the current detected by the current sensor in real time so as to judge the residual electric quantity of the storage battery, and when the residual electric quantity is lower than a set safety threshold, the storage battery energy management controller outputs a high-level signal to awaken the vehicle control unit; and the vehicle control unit sends a charging starting instruction to the direct current-to-direct current power supply exchanger, and stops charging when the residual electric quantity of the storage battery reaches a rated value.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a power shortage prevention system for an electric automobile storage battery.
Background
With the aggravation of energy crisis and the increasing severity of environmental pollution, new energy electric vehicles are increasingly paid more attention by merchants and consumers due to the outstanding advantages of energy conservation and environmental protection. However, since the electric vehicle is added with more normal electric controllers such as the MCU, the BMS, the TBOX, the VCU, etc. compared with the conventional fuel vehicle, and such normal electric controllers consume large electric energy, the electric vehicle may easily lose the electric energy of the battery when parked for a long time, so that the vehicle cannot be started.
In order to solve the above problems, the existing solutions are: when the vehicle is parked and dormant, the battery power of the storage battery is judged by detecting the voltage of the storage battery in real time, when the voltage of the storage battery is lower than a set threshold value, the storage battery is charged by starting a direct current-to-direct current power supply exchanger DCDC device, and when the DCDC works for a set time, the operation is stopped, and the power supplement is completed. However, the voltage is not precisely corresponding to the residual capacity of the storage battery, and the voltage fluctuation is large, so that the residual capacity of the storage battery is not precisely judged according to the voltage, and the capacity of the storage battery is misjudged; in addition, the electricity supplementing mode cannot ensure that the storage battery is fully charged every time, so that the DCDC is frequently started, and the service life of the DCDC and the service life of the storage battery are finally influenced.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a system for preventing a power shortage of an electric vehicle storage battery, comprising: the system comprises a storage battery energy management controller, a storage battery, a current sensor, a direct current-to-direct current power supply converter DCDC, a power battery, a vehicle control unit VCU and a battery management system BMS; wherein the content of the first and second substances,
the input end of the DC-DC power supply exchanger DCDC is connected with the power battery, the output end of the DC-DC power supply exchanger DCDC is connected with the storage battery, the DC-DC power supply exchanger DCDC is used for converting the DC voltage output by the power battery into the DC voltage required by the storage battery, and the storage battery is used for supplying power to the electric automobile;
the current sensor is arranged on a loop of the storage battery and the direct current-to-direct current power supply exchanger DCDC and is used for detecting the current of the storage battery and transmitting the detected current to the storage battery energy management controller;
the input end of the storage battery energy management controller is connected with the current sensor and receives the current detected by the current sensor in real time so as to judge the residual electric quantity of the storage battery, the output end of the storage battery energy management controller is connected with the vehicle control unit VCU, and when the storage battery energy management controller calculates that the electric quantity of the storage battery is lower than a set safety threshold value, the storage battery energy management controller outputs a high-level signal to wake up the vehicle control unit VCU;
the vehicle control unit VCU sends a network management message after being awakened so as to awaken the battery management system BMS and the DC-to-DC power supply exchanger DCDC which are connected with a controller area network CAN network, the battery management system BMS sends the information of a power battery and the state information of the DC-to-DC power supply exchanger DCDC to the vehicle control unit VCU through the CAN network, finally the vehicle control unit VCU sends a charging starting instruction to the DC-to-DC power supply DCDC, and when the storage battery energy management controller calculates the electric quantity of the storage battery as a rated value, the charging is stopped;
further, the current sensor is mounted on a negative electrode of the storage battery;
further, the current sensor is mounted on the positive electrode of the battery cell;
preferably, the dc-dc power supply exchanger DCDC is connected to the power battery through a high-voltage line;
preferably, the mode of calculating the electric quantity of the accumulator by the accumulator energy management controller is an ampere-hour integration method.
Drawings
Fig. 1 is a block diagram of the structure of an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the embodiment of the invention includes a battery energy management controller, a battery, a current sensor, a dc-dc power converter DCDC, a power battery, a vehicle control unit VCU, and a battery management system BMS. The direct current-to-direct current power supply converter DCDC input end is connected with a power battery through a high-voltage line, the direct current-to-direct current power supply converter DCDC output end is connected with a storage battery, a current sensor is installed in a loop of the storage battery and the direct current-to-direct current power supply converter DCDC, the storage battery energy management controller input end is connected with the current sensor, and the storage battery energy management controller output end is connected with a vehicle control unit VCU.
As shown in fig. 1, specifically, the dc-dc power converter DCDC is used to convert the dc voltage output from the power battery into the dc voltage required by the battery, the battery is used to supply power to the electric vehicle, the current sensor is installed on the negative electrode of the battery, detects the current of the battery in real time, and transmits the current signal to the battery energy management controller, the battery energy management controller calculates the electric quantity of the battery by ampere-hour integration method, so as to determine the remaining electric quantity of the battery, the battery energy management controller, the battery management system BMS, and the dc-dc power converter DCDC are all connected through the controller area network CAN network, and transmit their respective information to the vehicle controller VCU, and when the battery energy management controller calculates that the electric quantity of the battery is lower than a set safety threshold, the battery energy management controller outputs a high level signal to wake up the vehicle controller VCU, then the vehicle control unit VCU sends a network management message to awaken the battery management system BMS and the DC-to-DC power supply converter DCDC on the CAN network, the battery management system BMS sends the information of the power battery and the state information of the DC-to-DC power supply converter DCDC to the vehicle control unit VCU through the CAN network, finally the vehicle control unit VCU sends a charging starting instruction to the DC-to-DC power supply converter DCDC, and when the energy management controller of the storage battery calculates the electric quantity of the storage battery as a rated value, namely the electric quantity of the storage battery reaches 100%, the charging of the DC power supply converter DCDC is stopped;
it should be noted that the above mentioned are only preferred embodiments of the present invention, and the above mentioned preferred embodiments should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that certain modifications and variations may be made, and these modifications and variations are considered to be within the scope of the present invention.
Claims (5)
1. An electric vehicle accumulator jar anti-shortage system, comprising: storage battery jar, power battery, vehicle control unit VCU, battery management system BMS, its characterized in that still includes: the energy management controller of the storage battery, the current sensor and the direct current-to-direct current power supply converter DCDC;
the input end of the DC-DC power supply exchanger DCDC is connected with the power battery, the output end of the DC-DC power supply exchanger DCDC is connected with the storage battery, the DC-DC power supply exchanger DCDC is used for converting the DC voltage output by the power battery into the DC voltage required by the storage battery, and the storage battery is used for supplying power to the electric automobile;
the current sensor is arranged on a loop of the storage battery and the direct current-to-direct current power supply exchanger DCDC and is used for detecting the current of the storage battery and transmitting the detected current to the storage battery energy management controller;
the input end of the storage battery energy management controller is connected with the current sensor and receives the current detected by the current sensor in real time so as to judge the residual electric quantity of the storage battery, the output end of the storage battery energy management controller is connected with the vehicle control unit VCU, and when the storage battery energy management controller calculates that the electric quantity of the storage battery is lower than a set safety threshold value, the storage battery energy management controller outputs a high-level signal to wake up the vehicle control unit VCU;
the vehicle control unit VCU sends a network management message after being awakened so as to awaken the battery management system BMS and the DC-to-DC power supply converter DCDC which are connected with a controller area network CAN network, the battery management system BMS sends information of a power battery and state information of the DC-to-DC power supply converter DCDC to the vehicle control unit VCU through the CAN network, finally the vehicle control unit VCU sends a charging starting instruction to the DC-to-DC power supply DCDC, and when the storage battery energy management controller calculates the electric quantity of the storage battery as a rated value, the charging is stopped.
2. The electric vehicle accumulator jar brown-out prevention system of claim 1, wherein the current sensor is mounted on the negative pole of the accumulator jar.
3. The electric vehicle accumulator jar electricity shortage prevention system of claim 1, wherein the current sensor is mounted on the positive pole of the accumulator jar.
4. The electric vehicle accumulator jar anti-brownout system of claim 1, wherein the dc-dc power exchanger DCDC is connected to the power battery via a high voltage line.
5. The electric vehicle storage battery power shortage prevention system according to claim 1, wherein the storage battery energy management controller calculates the storage battery power in an ampere-hour integration method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010151104.8A CN111231671A (en) | 2020-03-06 | 2020-03-06 | Insufficient voltage prevention system for storage battery of electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010151104.8A CN111231671A (en) | 2020-03-06 | 2020-03-06 | Insufficient voltage prevention system for storage battery of electric automobile |
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| CN111231671A true CN111231671A (en) | 2020-06-05 |
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| CN202010151104.8A Pending CN111231671A (en) | 2020-03-06 | 2020-03-06 | Insufficient voltage prevention system for storage battery of electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112918322A (en) * | 2021-03-18 | 2021-06-08 | 阿尔特汽车技术股份有限公司 | Charging method and system for low-voltage storage battery of new energy automobile |
| CN113910910A (en) * | 2021-10-26 | 2022-01-11 | 华人运通(江苏)技术有限公司 | Low-voltage power supply power supplementing method, device, equipment and storage medium for electric automobile |
-
2020
- 2020-03-06 CN CN202010151104.8A patent/CN111231671A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112918322A (en) * | 2021-03-18 | 2021-06-08 | 阿尔特汽车技术股份有限公司 | Charging method and system for low-voltage storage battery of new energy automobile |
| CN113910910A (en) * | 2021-10-26 | 2022-01-11 | 华人运通(江苏)技术有限公司 | Low-voltage power supply power supplementing method, device, equipment and storage medium for electric automobile |
| CN113910910B (en) * | 2021-10-26 | 2023-09-15 | 华人运通(江苏)技术有限公司 | Electric automobile low-voltage power supply supplementing method, device, equipment and storage medium |
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