CN114465304A - Vehicle-mounted hybrid power supply system - Google Patents
Vehicle-mounted hybrid power supply system Download PDFInfo
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- CN114465304A CN114465304A CN202210031248.9A CN202210031248A CN114465304A CN 114465304 A CN114465304 A CN 114465304A CN 202210031248 A CN202210031248 A CN 202210031248A CN 114465304 A CN114465304 A CN 114465304A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims abstract description 110
- 229910001416 lithium ion Inorganic materials 0.000 claims abstract description 110
- 238000012544 monitoring process Methods 0.000 claims abstract description 95
- 229910052987 metal hydride Inorganic materials 0.000 claims abstract description 91
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000000178 monomer Substances 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000019635 sulfation Effects 0.000 description 1
- 238000005670 sulfation reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
-
- 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
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
-
- 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)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
An in-vehicle hybrid power supply system includes: the monitoring management unit comprises a wide-temperature nickel-metal hydride battery monitoring management system and a lithium ion battery monitoring management system, wherein the wide-temperature nickel-metal hydride battery monitoring management system is connected with the wide-temperature nickel-metal hydride battery unit, and the lithium ion battery monitoring management system is connected with a lithium ion battery pack; the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are connected in series, the wide-temperature nickel-metal hydride battery unit comprises a wide-temperature nickel-metal hydride battery pack and a first variable resistance module connected in series in the wide-temperature nickel-metal hydride battery pack, the lithium ion battery unit comprises a lithium ion battery pack and a second variable resistance module connected in series in the lithium ion battery pack, and the resistance values of the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are consistent under the condition of the same charging and discharging current.
Description
Technical Field
The invention relates to the field of vehicle-mounted power supplies, in particular to a vehicle-mounted hybrid power supply system.
Background
In recent years, with the fluctuation of fuel price and the pollution of automobile exhaust to the environment, the research of electric vehicles is strengthened in all countries around the world, green and environment-friendly new energy vehicles are vigorously developed, and new energy vehicles taking new energy power batteries as the core are attracted attention. Among them, lithium ion batteries have been the focus of research in chemical power sources due to their advantages of high energy density, long service life, no memory effect, etc. At present, the lithium ion power battery has certain defects in the aspects of low-temperature performance, cost and the like. For a long time, the output power and energy of the lithium ion battery are seriously influenced in a low-temperature environment, and the popularization and development of new energy automobiles in northern areas of China are limited.
The lithium ion battery obviously shortens the working time or does not work under the high and low temperature environment due to the self reason. For example, when the ambient temperature exceeds 25 ℃, the service life of the lithium ion battery is shortened by half when the temperature rises by 7-10 ℃. If the design life of the battery is 3 years at 25 ℃, and if the battery is operated for a long time at 35 ℃, the design life of the battery is only 1.5 years; when the ambient temperature is reduced to-20 ℃, the capacity of the lithium ion battery is reduced to about 65% of the rated capacity of the battery.
In addition, the temperature is too low or too high, which may lead to insufficient charging of the lithium ion battery for a long time, resulting in sulfation of the negative electrode, and finally resulting in difficult battery discharging, and if the power supply of the base station cannot work sufficiently, the communication quality may be seriously affected. How to prolong the normal service life of the lithium ion battery is a main problem which is always discussed by the people in the industry.
The test results released by the national automobile technical research center show that the average endurance mileage of the new energy vehicle is reduced by 39% and the average endurance mileage of the vehicle without the battery temperature control system is reduced by 60% under the conditions that the temperature is kept at-7 ℃ outdoors and 22 ℃ indoors. The activity of the battery is reduced at low temperature, so that the braking energy recovery efficiency of the new energy automobile is obviously reduced at low temperature; meanwhile, the charging time of the battery also becomes slow, so that a plurality of new energy vehicle owners can reflect the conditions that the charging is slow and the charging is not carried out in winter.
Disclosure of Invention
In order to solve the above problems, the present invention provides a vehicle-mounted hybrid power supply system.
An onboard hybrid power supply system includes: the monitoring management unit comprises a wide-temperature nickel-metal hydride battery monitoring management system and a lithium ion battery monitoring management system, the wide-temperature nickel-metal hydride battery monitoring management system is connected with the wide-temperature nickel-metal hydride battery unit and is used for monitoring various information of the wide-temperature nickel-metal hydride battery unit, and the lithium ion battery monitoring management system is connected with a lithium ion battery pack and is used for monitoring various information of the lithium ion battery unit; the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are connected in series, the wide-temperature nickel-metal hydride battery unit comprises a wide-temperature nickel-metal hydride battery pack and a first variable resistance module connected in series in the wide-temperature nickel-metal hydride battery pack, the lithium ion battery unit comprises a lithium ion battery pack and a second variable resistance module connected in series in the lithium ion battery pack, and the resistance values of the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are consistent under the condition of the same charging and discharging current.
Preferably, the wide-temperature nickel-metal hydride battery pack is formed by connecting a plurality of wide-temperature nickel-metal hydride battery monomers in series, the lithium ion battery pack is formed by connecting a plurality of lithium ion battery monomers in series, and the capacity of the wide-temperature nickel-metal hydride battery pack is the same as that of the lithium ion battery pack.
Preferably, the applicable temperature of the wide-temperature nickel-metal hydride battery monomer is-40 ℃ to 60 ℃, the discharge capacity of the wide-temperature nickel-metal hydride battery monomer reaches more than 85% of the rated capacity at room temperature under the discharge conditions of-50 ℃ to-40 ℃ and 0.2 ℃, and the discharge capacity reaches more than 80% of the rated capacity at room temperature under the discharge conditions of 50 ℃ to 60 ℃ and 0.2 ℃, so that the wide-temperature nickel-metal hydride battery monomer has excellent high-temperature discharge characteristics. On the basis of not changing the functions of the original battery pack, the performance of the whole power supply under the all-weather condition is improved by utilizing the advantage that the nickel-hydrogen battery can work well under the wide-temperature condition.
Preferably, the monitoring management unit further comprises an online monitoring system, and the online monitoring system is respectively connected with the wide-temperature nickel-metal hydride battery monitoring management system and the lithium ion battery monitoring management system, and is used for displaying information of the wide-temperature nickel-metal hydride battery monitoring management system and the lithium ion battery monitoring management system in real time.
Preferably, the monitoring management unit further comprises a temperature monitoring system, and the temperature monitoring system is connected with the wide-temperature nickel-metal hydride battery pack and the lithium ion battery pack and used for monitoring the temperature of the battery pack in real time.
Preferably, the first detection ports of the wide-temperature nickel-metal hydride battery monitoring and managing system and the lithium ion battery monitoring and managing system are respectively and correspondingly connected with the positive electrode and the negative electrode of the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit, and the detection result is transmitted to the online monitoring system through the data transmission interface.
Preferably, the wide-temperature nickel-metal hydride battery monitoring and managing system comprises a wide-temperature nickel-metal hydride battery voltage monitoring system and a wide-temperature nickel-metal hydride battery current monitoring system which are both connected with the wide-temperature nickel-metal hydride battery pack, and the lithium ion battery monitoring and managing system comprises a lithium ion battery voltage monitoring system and a lithium ion battery current monitoring system which are both connected with the lithium ion battery pack.
Preferably, the monitoring management unit further comprises a low power alarm system, wherein a second detection port arranged in the low power alarm system is respectively connected with the anode and the cathode of the wide-temperature nickel-hydrogen battery unit and the lithium ion battery unit correspondingly, and the detection result is transmitted to the online monitoring system through the data transmission interface.
Has the advantages that: the nickel-hydrogen battery pack and the lithium ion battery with the same capacity are combined together by connecting a variable resistor, a switch and the like in a circuit, and the principle of circuit design is that the ratio of the voltage of the battery pack to the resistance tends to be consistent under the condition of the same charging and discharging current. The main body of the invention is a novel battery pack obtained by combining a small amount of wide-temperature nickel-hydrogen batteries and the original lithium ion power battery pack according to a specific mode, and the invention is invented on the basis of not changing the design and the function of the original power supply. The invention can obviously increase the discharge capacity under high and low temperature environment, prolong the service life of the power supply, make the power supply more suitable for working in a wide temperature range (-40 ℃ to +60 ℃), improve the service time and efficiency of the power supply, and ensure the wide temperature working characteristic and the endurance mileage of the vehicle-mounted power supply.
Drawings
Fig. 1 is a schematic circuit diagram of a hybrid power supply system.
FIG. 2 is a comparison graph of-20 ℃ capacity-voltage discharge for a 36V hybrid power system and a 36V lithium ion battery pack.
FIG. 3 is a comparison graph of-30 ℃ duration-voltage discharge for a 48V hybrid power system and a 48V lithium ion battery pack.
Detailed Description
The invention will be further illustrated with reference to the following examples and figures 1-3.
Example (b): an onboard hybrid power supply system includes: the system comprises a wide-temperature nickel-hydrogen battery unit, a lithium ion battery unit and a monitoring management unit. The wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are connected in series, and the wide-temperature nickel-metal hydride battery unit comprises a wide-temperature nickel-metal hydride battery pack and a first variable resistance module which is connected in series in the wide-temperature nickel-metal hydride battery pack. The lithium ion battery unit comprises a lithium ion battery pack and a second variable resistance module which is connected in series in the lithium ion battery pack. Under the condition of the same charging and discharging current, the resistance values of the wide-temperature nickel-hydrogen battery unit and the lithium ion battery unit are consistent. The wide-temperature nickel-metal hydride battery pack is formed by connecting a plurality of wide-temperature nickel-metal hydride battery monomers in series, the lithium ion battery pack is formed by connecting a plurality of lithium ion battery monomers in series, and the capacity of the wide-temperature nickel-metal hydride battery pack is the same as that of the lithium ion battery pack. The applicable temperature of the wide-temperature nickel-metal hydride battery monomer is-40 ℃ to 60 ℃, the discharge capacity of the wide-temperature nickel-metal hydride battery monomer reaches more than 85% of the rated capacity at room temperature under the discharge conditions of-50 ℃ to-40 ℃ and 0.2 ℃, and the discharge capacity reaches more than 80% of the rated capacity at room temperature under the discharge conditions of 50 ℃ to 60 ℃ and 0.2 ℃, so that the wide-temperature nickel-metal hydride battery monomer has excellent high-temperature discharge characteristics. On the basis of not changing the functions of the original battery pack, the performance of the whole power supply under the all-weather condition is improved by utilizing the advantage that the nickel-hydrogen battery can work well under the wide-temperature condition.
The monitoring management unit comprises a wide-temperature nickel-hydrogen battery monitoring management system, a lithium ion battery monitoring management system, an online monitoring system, a temperature monitoring system and a low-power alarm system.
The wide-temperature nickel-metal hydride battery monitoring and managing system is connected with the wide-temperature nickel-metal hydride battery unit and used for monitoring various information of the wide-temperature nickel-metal hydride battery unit, and the lithium ion battery monitoring and managing system is connected with the lithium ion battery pack and used for monitoring various information of the lithium ion battery unit. The online monitoring system is respectively connected with the wide-temperature nickel-metal hydride battery monitoring and managing system and the lithium ion battery monitoring and managing system and is used for displaying information of the wide-temperature nickel-metal hydride battery monitoring and managing system and the lithium ion battery monitoring and managing system in real time. First detection ports arranged on the wide-temperature nickel-metal hydride battery monitoring and managing system and the lithium ion battery monitoring and managing system are respectively and correspondingly connected with the positive and negative electrodes of the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit, and detection results are transmitted to the online monitoring system through a data transmission interface. The wide-temperature nickel-metal hydride battery monitoring and managing system comprises a wide-temperature nickel-metal hydride battery voltage monitoring system and a wide-temperature nickel-metal hydride battery current monitoring system which are both connected with a wide-temperature nickel-metal hydride battery pack, and the lithium ion battery monitoring and managing system comprises a lithium ion battery voltage monitoring system and a lithium ion battery current monitoring system which are both connected with a lithium ion battery pack.
The temperature monitoring system is connected with the wide-temperature nickel-metal hydride battery pack and the lithium ion battery pack and used for monitoring the temperature of the battery pack in real time. The low-voltage wide-temperature nickel-hydrogen battery unit is connected with the lithium ion battery unit and the positive and negative electrodes of the lithium ion battery pack, and the detection result is transmitted to the online monitoring system through the data transmission interface.
The monitoring management units adopted in the following experimental groups are the same, and various monitoring coordination on the battery pack can be realized through the existing instruments and equipment on the market, so that redundant description is not repeated. Only different types of wide temperature nickel-metal hydride batteries and lithium ion batteries are used as specific experimental groups for explanation.
Experimental group 1: the wide-temperature nickel-metal hydride battery monomer in the experimental group is an 8Ah wide-temperature nickel-metal hydride battery monomer, 10 wide-temperature nickel-metal hydride battery monomers are connected in series to form a 12V-8Ah wide-temperature nickel-metal hydride battery group, and a first variable resistance module is connected in series in the wide-temperature nickel-metal hydride battery group to form a wide-temperature nickel-metal hydride battery unit. 24V-8Ah lithium ion battery monomers produced by a certain manufacturer are connected in series to form a lithium ion battery pack, and the lithium ion battery pack is connected in series with a corresponding second variable resistance module to form a lithium ion battery unit. And then the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are mutually connected in series and are assembled into a 36V hybrid power supply system together with a monitoring management unit. The control group 1 is a conventional 36V lithium ion battery manufactured by the same manufacturer.
After the experimental group 1 and the control group 1 were fully charged, they were simultaneously left at-20 ℃ for 8 hours, and then discharged at 24A current, respectively, with the discharge cutoff voltage of the experimental group 1 being 27V and the discharge cutoff voltage of the control group 1 being 27V. The test results are shown in fig. 2, and the discharge capacity of the experimental group 1, i.e., the 36V hybrid battery group shown in fig. 2, was 7.91 Ah; the discharge time of the control 1, i.e., the 36V lithium ion shown in FIG. 2, was 7.83 Ah. Therefore, the experimental group 1 can emit about 8% more energy than the control group 1, the initial discharge voltage and the median voltage can be increased by more than 2V, the requirements of the pure electric vehicle on the actual working condition in winter can be fully met, and the endurance mileage can not be greatly attenuated in the working temperature region.
Experimental group 2: the wide-temperature nickel-metal hydride battery unit in the experimental group is a 100Ah wide-temperature nickel-metal hydride battery unit, 10 wide-temperature nickel-metal hydride battery units are connected in series to form a 12V-100Ah wide-temperature nickel-metal hydride battery group, and a first variable resistance module is connected in series in the wide-temperature nickel-metal hydride battery group to form a wide-temperature nickel-metal hydride battery unit. The 36V-100Ah lithium ion battery monomer produced by a certain manufacturer is connected in series to form a lithium ion battery pack, and the lithium ion battery pack is connected in series with a corresponding second variable resistance module, so that a lithium ion battery unit is formed. And then the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are mutually connected in series and are assembled into a 48V hybrid power supply system together with a monitoring management unit. The control group 2 is a conventional 48V lithium ion battery manufactured by the same manufacturer.
The experimental group 2 and the control group 2 were fully charged and left at-30 ℃ for 8 hours. The discharge current was 7.2. + -. 0.8A as can be seen by monitoring the change in current during discharge. The test result shows that when the hybrid power system and the lithium ion battery are both discharged to the same voltage of 46.8V, the discharge time of the hybrid power system is 10.58h, the discharge time of the lithium ion battery is 7.67h, and the discharge time of the hybrid power system is 2.92h more than that of the lithium ion battery. When the lithium ion battery in the hybrid power supply system and the lithium ion battery used as a contrast experiment are discharged to the same voltage of 46.2V, the overall voltage of the hybrid power supply system is discharged to 47.2V, the discharge time is 9.92h, the discharge voltage of the lithium ion battery is discharged to 46.2V, the discharge time is 8.58h, and the discharge time of the hybrid power supply system is 1.33h more than that of the lithium ion battery. In summary, the hybrid power system is superior to the lithium ion battery in low-temperature discharge performance.
It should be understood that the above-described embodiments of the present invention are merely examples for illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. There is no need or no way to give poor examples of all embodiments. And such obvious changes and modifications which are within the spirit of the invention are deemed to be covered by the present invention.
Claims (8)
1. An in-vehicle hybrid power supply system characterized by comprising: the monitoring management unit comprises a wide-temperature nickel-metal hydride battery monitoring management system and a lithium ion battery monitoring management system, the wide-temperature nickel-metal hydride battery monitoring management system is connected with the wide-temperature nickel-metal hydride battery unit and is used for monitoring various information of the wide-temperature nickel-metal hydride battery unit, and the lithium ion battery monitoring management system is connected with a lithium ion battery pack and is used for monitoring various information of the lithium ion battery unit; the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are connected in series, the wide-temperature nickel-metal hydride battery unit comprises a wide-temperature nickel-metal hydride battery pack and a first variable resistance module connected in series in the wide-temperature nickel-metal hydride battery pack, the lithium ion battery unit comprises a lithium ion battery pack and a second variable resistance module connected in series in the lithium ion battery pack, and the resistance values of the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit are consistent under the condition of the same charging and discharging current.
2. The vehicular hybrid power supply system according to claim 1, characterized in that: the wide-temperature nickel-metal hydride battery pack is formed by connecting a plurality of wide-temperature nickel-metal hydride battery monomers in series, the lithium ion battery pack is formed by connecting a plurality of lithium ion battery monomers in series, and the capacity of the wide-temperature nickel-metal hydride battery pack is the same as that of the lithium ion battery pack.
3. The vehicular hybrid power supply system according to claim 2, characterized in that: the applicable temperature of the wide-temperature nickel-metal hydride battery monomer is-40 ℃ to 60 ℃, the discharge capacity of the wide-temperature nickel-metal hydride battery monomer reaches more than 85% of the rated capacity at room temperature under the discharge conditions of-50 ℃ to-40 ℃ and 0.2 ℃, and the discharge capacity reaches more than 80% of the rated capacity at room temperature under the discharge conditions of 50 ℃ to 60 ℃ and 0.2 ℃.
4. The vehicular hybrid power supply system according to claim 1, characterized in that: the monitoring management unit further comprises an online monitoring system, and the online monitoring system is respectively connected with the wide-temperature nickel-metal hydride battery monitoring management system and the lithium ion battery monitoring management system and is used for displaying information of the wide-temperature nickel-metal hydride battery monitoring management system and the lithium ion battery monitoring management system in real time.
5. The vehicular hybrid power supply system according to claim 4, characterized in that: the monitoring management unit further comprises a temperature monitoring system, and the temperature monitoring system is connected with the wide-temperature nickel-hydrogen battery pack and the lithium ion battery pack and used for monitoring the temperature of the battery pack in real time.
6. The vehicular hybrid power supply system according to claim 4, characterized in that: first detection ports arranged on the wide-temperature nickel-metal hydride battery monitoring and managing system and the lithium ion battery monitoring and managing system are respectively and correspondingly connected with the positive and negative electrodes of the wide-temperature nickel-metal hydride battery unit and the lithium ion battery unit, and detection results are transmitted to the online monitoring system through a data transmission interface.
7. The vehicular hybrid power supply system according to claim 4, characterized in that: the wide-temperature nickel-metal hydride battery monitoring and managing system comprises a wide-temperature nickel-metal hydride battery voltage monitoring system and a wide-temperature nickel-metal hydride battery current monitoring system which are both connected with a wide-temperature nickel-metal hydride battery pack, and the lithium ion battery monitoring and managing system comprises a lithium ion battery voltage monitoring system and a lithium ion battery current monitoring system which are both connected with a lithium ion battery pack.
8. The vehicular hybrid power supply system according to claim 4, characterized in that: the monitoring management unit further comprises a low-power alarm system, a second detection port arranged on the low-power alarm system is respectively connected with the anode and the cathode of the wide-temperature nickel-hydrogen battery unit and the anode and the cathode of the lithium ion battery unit correspondingly, and a detection result is transmitted to the online monitoring system through the data transmission interface.
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| CN202210031248.9A CN114465304A (en) | 2022-01-12 | 2022-01-12 | Vehicle-mounted hybrid power supply system |
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| CN202210031248.9A CN114465304A (en) | 2022-01-12 | 2022-01-12 | Vehicle-mounted hybrid power supply system |
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