CN114889428A - Power battery protection method and system - Google Patents
Power battery protection method and system Download PDFInfo
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- CN114889428A CN114889428A CN202110686168.2A CN202110686168A CN114889428A CN 114889428 A CN114889428 A CN 114889428A CN 202110686168 A CN202110686168 A CN 202110686168A CN 114889428 A CN114889428 A CN 114889428A
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- nitrogen
- power battery
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- 238000000034 method Methods 0.000 title claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 532
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 250
- 230000000284 resting effect Effects 0.000 claims abstract description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 32
- 239000007789 gas Substances 0.000 abstract description 14
- 230000001681 protective effect Effects 0.000 abstract description 6
- 230000009993 protective function Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
Images
Classifications
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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
-
- 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
-
- 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)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a power battery protection method and system, and belongs to the field of new energy automobiles. At present, a power battery protection system of a new energy automobile fails due to the fact that protective gas leaks. The invention includes detecting a vehicle state; if the vehicle is in a resting state and in a first set time period after charging is completed, supplying power to the nitrogen protection system, and executing normal nitrogen filling logic by the nitrogen protection system; after the first set time period, supplying power to the nitrogen protection system according to a set time interval, and executing a normal nitrogen filling logic; and if the requirement of charging nitrogen for the power battery is detected, supplying power to the nitrogen protection system for prolonging a second set time period. The invention can ensure that the protective nitrogen of the power battery always keeps higher air pressure, enhances the protective function of the power battery, reduces the potential safety hazard of the power battery and prolongs the service life of the power battery.
Description
Technical Field
The invention relates to a power battery protection method and system, and belongs to the field of new energy automobiles.
Background
The safety of the new energy power battery is a life line of a new energy automobile and is a fundamental guarantee for continuous and healthy development of the new energy automobile industry, and a power battery protection system must ensure that the protective gas pressure in the power battery meets a preset standard to ensure the safety of the full life cycle of the power battery. At present, the IP protection grade of the power battery is too low, so that the leakage of protective gas in the power battery is caused, even when a vehicle is powered off, air can permeate into the power battery, so that the air pressure of the protective gas is reduced, and further the failure of a protective system of the power battery is caused.
When a new energy vehicle is parked for a long time, if the power battery is adopted to supply power to the power battery protection system for a long time, the protection function of the power battery protection system is maintained, and safety accidents are easily caused by power feeding.
When a new energy automobile runs, a power battery breaks down, and generally, the protection system of the power battery fails due to insufficient gas pressure of protection gas of the power battery.
Disclosure of Invention
The invention aims to provide a power battery protection method and a power battery protection system, which are used for solving the problem of low nitrogen pressure caused by poor tightness of a power battery when a new energy vehicle is parked for a long time.
In order to achieve the above object, the present invention provides a power battery protection method, which detects a vehicle state; if the vehicle is in a resting state and within a first set time period after charging is completed, supplying power to the nitrogen protection system, and executing a normal nitrogen filling logic by the nitrogen protection system; after the first set time period, supplying power to the nitrogen protection system according to a set time interval, and executing a normal nitrogen filling logic; if the power battery has the requirement of charging nitrogen, supplying power to the nitrogen protection system for prolonging a second set time period; if the power battery does not have the requirement of charging nitrogen, stopping supplying power to the nitrogen protection system;
the normal nitrogen filling logic is as follows: and if the difference value between the nitrogen gas pressure in the power battery and the external atmospheric pressure value is detected to be smaller than the minimum set air pressure standard, charging nitrogen gas into the power battery.
The invention has the beneficial effects that: through judging the vehicle state, the nitrogen protection system is powered in the high-occurrence period of the safety accident after the charging of the vehicle is finished, the nitrogen protection system detects the nitrogen pressure of the power battery, the power battery is charged with nitrogen, the power supply of the nitrogen system is awakened according to the set time interval, and the power battery is detected and charged with nitrogen, so that the protection nitrogen of the power battery always keeps higher pressure, the protection function of the power battery is enhanced, the potential safety hazard of the power battery is reduced, and the service life of the power battery is prolonged.
Further, in the above method, the method for supplying power to the nitrogen protection system includes: awakening a nitrogen system power supply which is an independently arranged power supply.
The beneficial effects of doing so are: the power supply is independently arranged outside the power supply of the whole vehicle and used for supplying power to the nitrogen protection system in the vehicle shelving state, and the power battery of the whole vehicle is not used, so that the electric quantity of the power battery can be effectively kept.
Further, in the method, in a resting charging state of the vehicle, the power battery and the nitrogen system power supply power for the nitrogen protection system, and a normal nitrogen charging logic is executed; and in the running state of the vehicle, the power battery supplies power for the nitrogen protection system, and the normal nitrogen charging logic is executed.
The beneficial effects of doing so are: according to the detected states of other vehicles, different power supplies are selected to supply power to the nitrogen protection system, and the nitrogen filling function of the nitrogen protection system can be effectively realized. The charging gun charges the power battery, and the electric quantity of the storage battery can be saved by indirectly supplying power to the nitrogen protection system.
Further, in the above method, the charging the power battery with nitrogen in the normal nitrogen charging logic further includes detecting air pressure of a nitrogen gas storage tank, and if the air pressure of the nitrogen gas storage tank is not enough to charge the power battery with nitrogen, controlling the nitrogen generation module to charge the nitrogen gas storage tank with nitrogen.
The beneficial effects of doing so are: and detecting the air pressure of the nitrogen gas storage tank, and filling nitrogen gas into the nitrogen gas storage tank in time when the air pressure of the nitrogen gas storage tank is not enough to fill nitrogen gas into the power battery, so as to ensure that the air source supply is sufficient when the power battery is filled with nitrogen gas.
Further, in the method, when the power battery fails during running of the vehicle, the power battery is powered off, the storage battery supplies power to the nitrogen protection system, and the failed power battery is charged with nitrogen at a large flow rate.
The beneficial effects of doing so are: under the condition that the power battery breaks down during the running of the vehicle, the storage battery of the whole vehicle supplies power to the nitrogen protection system, and the nitrogen is charged into the broken-down power battery at a large flow rate, so that an inert gas environment is created for the power battery, the fire accident is prevented, and the safety of the power battery is guaranteed.
A power battery protection system comprises a nitrogen gas storage tank and a nitrogen gas protection controller, wherein the nitrogen gas storage tank comprises a pipeline for charging nitrogen gas into a power battery, and an electromagnetic valve is arranged on the pipeline; the nitrogen protection controller comprises a sensor interface for collecting nitrogen gas pressure in the power battery, and is in control connection with the electromagnetic valve;
detecting the state of the vehicle, and if the vehicle is in a resting state and in a first set time period after charging is finished, supplying power to the nitrogen protection system, and executing a normal nitrogen filling logic by the nitrogen protection system; after the first set time period, supplying power to the nitrogen protection system according to a set time interval, and executing a normal nitrogen filling logic; if the power battery has the requirement of charging nitrogen, supplying power to the nitrogen protection system for prolonging a second set time period; if the power battery does not have the requirement of charging nitrogen, stopping supplying power to the nitrogen protection system;
the normal nitrogen filling logic is as follows: and if the difference value between the nitrogen gas pressure in the power battery and the external atmospheric pressure value is detected to be smaller than the minimum set air pressure standard, charging nitrogen gas into the power battery.
Further, in the above system, the system further includes an independently arranged nitrogen system power supply, and the method for supplying power to the nitrogen protection system includes: and awakening the power supply of the nitrogen system.
Further, in the system, in a state that the vehicle is parked and charged, the power battery and the nitrogen system power supply power the nitrogen protection system, and a normal nitrogen charging logic is executed; and in the running state of the vehicle, the power battery supplies power for the nitrogen protection system, and a normal nitrogen charging logic is executed.
Further, in the above system, the step of charging nitrogen into the power battery in the normal nitrogen charging logic further includes detecting air pressure of a nitrogen storage tank, and if the air pressure of the nitrogen storage tank is not enough to charge nitrogen into the power battery, controlling the nitrogen generation module to charge nitrogen into the nitrogen storage tank.
Further, in the system, the storage battery is used for supplying power to the nitrogen protection system when the power battery fails during running of the vehicle, and the failed power battery is charged with nitrogen at a large flow rate.
Drawings
FIG. 1 is a schematic diagram of the electrical configuration of the present invention;
FIG. 2 is a logic diagram of the operation of the nitrogen protection system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
The embodiment of the system is as follows:
as shown in fig. 1, the power battery protection system of the invention comprises a nitrogen gas storage tank, a nitrogen gas protection controller, a braking gas circuit, a nitrogen making module, an electromagnetic valve, a vehicle control unit and a power supply.
The power supply comprises a power battery, a storage battery power supply and a nitrogen protection system power supply. The power battery, the storage battery power supply and the nitrogen protection system power supply are connected to a circuit bus of the nitrogen protection system, and the vehicle control unit and the nitrogen protection controller are connected with the circuit bus.
The braking gas circuit comprises a whole vehicle gas production device and a gas storage bag, wherein the whole vehicle gas production device is an air compressor and is used for receiving a gas production instruction of the whole vehicle controller to work and inflating the gas storage bag.
The nitrogen production module is used for obtaining air of the air storage bag, separating the air to produce high-purity nitrogen, storing the high-purity nitrogen in the nitrogen storage tank and using the high-purity nitrogen as an air source for filling the power battery with nitrogen.
And air pressure detection sensors are arranged on the power battery and the nitrogen gas storage tank, and the nitrogen protection controller is connected with the air pressure detection sensors and feeds back air pressure information to the whole vehicle controller. The vehicle control unit receives the air pressure information to control the air compressor to inflate and pressurize as an air storage air bag, and can also control the nitrogen protection controller to open the electromagnetic valve on the connecting pipeline of the nitrogen storage tank and the power battery to fill nitrogen into the power battery.
The method comprises the following steps:
fig. 2 shows the working logic of the nitrogen protection system of the present invention, and the power battery protection method is further explained by combining the power battery protection system described above:
the method for protecting the power battery comprises the steps of firstly detecting the state of a vehicle, then selecting different power supplies according to the state of the vehicle to supply power to a nitrogen protection system through a circuit bus, and executing normal nitrogen charging logic on the power battery by the nitrogen protection system.
The normal nitrogen filling logic is as follows: and if the difference value between the nitrogen gas pressure in the power battery and the external atmospheric pressure is detected to be smaller than the minimum set air pressure standard, filling nitrogen gas into the power battery.
When the vehicle is in a running state, the power battery supplies power for the nitrogen protection system, the nitrogen protection system charges nitrogen into the power battery according to a normal nitrogen charging logic, the whole vehicle controller controls the air compressor to pressurize an air source of the nitrogen production module in the nitrogen charging process, the nitrogen production module separates nitrogen of compressed air and stores the nitrogen in the nitrogen storage tank, and the nitrogen protection controller opens the electromagnetic valve on a connecting pipeline of the nitrogen storage tank and the power battery to charge the nitrogen into the power battery.
When the vehicle is in a laying charging state, the vehicle control unit collects a charging gun insertion signal, a power battery and a nitrogen system power supply are used for supplying power to a nitrogen protection system, the power battery is charged with nitrogen according to a normal nitrogen charging logic, the process of charging the power battery with nitrogen further comprises the step that a nitrogen protection controller detects the air pressure of a nitrogen storage tank, if the air pressure of the nitrogen storage tank is insufficient to charge the power battery with nitrogen, the nitrogen protection controller feeds back air pressure information to the vehicle control unit, the vehicle control unit controls an air compressor to work to pressurize an air source of a nitrogen charging module, the nitrogen protection controller controls a nitrogen making module to charge the nitrogen storage tank with nitrogen, if the nitrogen protection controller detects that the air pressure of the nitrogen storage tank meets the nitrogen charging requirement, an electromagnetic valve on a connecting pipeline of the nitrogen storage tank and the power battery is opened, and the power battery is charged with nitrogen.
When the vehicle is in a shelving state after charging is finished, timing is started from the time of charging completion, a first set time period is started after 5 minutes, the first set time period is 2 hours, within 2 hours, a power supply of a nitrogen system is awakened automatically, power is supplied to a nitrogen protection system through a circuit bus, the nitrogen protection system charges nitrogen into the power battery according to a normal nitrogen charging logic, the nitrogen charging process further comprises the step that a nitrogen protection controller detects the air pressure of a nitrogen storage tank, if the air pressure of the nitrogen storage tank is not enough to charge the nitrogen into the power battery, the nitrogen protection controller acquires compressed air from a storage gas bag through a nitrogen generation module to generate nitrogen to charge the nitrogen storage tank for nitrogen pressurization, the nitrogen protection controller opens an electromagnetic valve on a connecting pipeline between the nitrogen storage tank and the power battery, and charges the nitrogen into the power battery.
After the nitrogen charging within 2 hours is finished, the nitrogen system power supply is self-awakened according to a set time interval, the nitrogen protection system is powered through the circuit bus, the nitrogen pressure of the power battery is detected, if the power battery has a nitrogen charging requirement, the power supply state is prolonged by a second set time period, the second set time period is 1 hour, in 1 hour, the nitrogen system power supply supplies power to the nitrogen protection system through the circuit bus, and the nitrogen protection system charges nitrogen to the power battery according to a normal nitrogen charging logic.
Timing the ending time of the nitrogen filling of the power battery as a starting point at a preset time interval, wherein the interval is 4 hours, 8 hours, 12 hours. For example, after the first nitrogen charging of the power battery within the first set time period is finished for 4 hours, the nitrogen system power supply is self-awakened, and after the nitrogen charging of the power battery within the second set time period is finished for 8 hours, the nitrogen system power supply is self-awakened.
When the vehicle is in an uncharged shelving state, the vehicle is powered off, namely timing is started when the vehicle is flamed out, a first set time period is started after 5 minutes, the first set time period is 2 hours, within 2 hours, a power supply of a nitrogen system is self-awakened, power is supplied to a nitrogen protection system through a circuit bus, the nitrogen protection system charges the nitrogen into the power battery according to a normal nitrogen charging logic, the nitrogen charging process further comprises the step that a nitrogen protection controller detects the air pressure of a nitrogen storage tank, if the air pressure of the nitrogen storage tank is not enough to charge the nitrogen into the power battery, the nitrogen protection controller acquires compressed air from a storage bag through a nitrogen generation module to generate the nitrogen, the compressed air is used for pressurizing the nitrogen storage tank, the nitrogen protection controller opens an electromagnetic valve on a connecting pipeline between the nitrogen storage tank and the power battery, and charges the nitrogen into the power battery.
After the nitrogen charging within 2 hours is finished, the nitrogen system power supply is self-awakened according to a set time interval, the nitrogen protection system is powered through the circuit bus, the nitrogen pressure of the power battery is detected, if the power battery has a nitrogen charging requirement, the power supply state is prolonged by a second set time period, the second set time period is 1 hour, in 1 hour, the nitrogen system power supply supplies power to the nitrogen protection system through the circuit bus, and the nitrogen protection system charges nitrogen to the power battery according to a normal nitrogen charging logic.
Timing the ending time of the nitrogen filling of the power battery as a starting point at a preset time interval, wherein the interval is 4 hours, 8 hours, 12 hours. For example, after the first nitrogen charging of the power battery within the first set time period is finished for 4 hours, the nitrogen system power supply is self-awakened, and after the nitrogen charging of the power battery within the second set time period is finished for 8 hours, the nitrogen system power supply is self-awakened.
When the vehicle is in a fault state of the power battery during running, the power battery and the nitrogen system power supply are powered off, the whole vehicle storage battery supplies power to the nitrogen protection system, and large-flow nitrogen charging is carried out on the fault power battery.
Claims (10)
1. A power battery protection method is characterized in that a vehicle state is detected; if the vehicle is in a resting state and within a first set time period after charging is completed, supplying power to the nitrogen protection system, and executing a normal nitrogen filling logic by the nitrogen protection system; after the first set time period, supplying power to the nitrogen protection system according to a set time interval, and executing a normal nitrogen filling logic; if the power battery has the requirement of charging nitrogen, supplying power to the nitrogen protection system for prolonging a second set time period; if the power battery does not have the requirement of charging nitrogen, stopping supplying power to the nitrogen protection system;
the normal nitrogen filling logic is as follows: and if the difference value between the nitrogen gas pressure in the power battery and the external atmospheric pressure value is detected to be smaller than the minimum set air pressure standard, charging nitrogen gas into the power battery.
2. The power battery protection method according to claim 1, wherein the method for supplying power to the nitrogen protection system comprises the following steps: awakening a nitrogen system power supply which is an independently arranged power supply.
3. The power battery protection method according to claim 2, wherein in a vehicle rest state of charge, the nitrogen protection system is powered by the power battery and the nitrogen system power supply, executing a normal nitrogen charging logic; and in the running state of the vehicle, the power battery supplies power for the nitrogen protection system, and the normal nitrogen charging logic is executed.
4. The power battery protection method of claim 3, wherein the normal nitrogen fill logic further comprises detecting a nitrogen reservoir pressure and controlling the nitrogen generation module to fill the nitrogen reservoir with nitrogen if the nitrogen reservoir pressure is below a set value.
5. The method for protecting the power battery according to claim 4, wherein when the power battery fails during running of the vehicle, the power battery is powered off, the storage battery supplies power to the nitrogen protection system, and the failed power battery is charged with nitrogen at a large flow rate.
6. The power battery protection system is characterized by comprising a nitrogen gas storage tank and a nitrogen gas protection controller, wherein the nitrogen gas storage tank comprises a pipeline for charging nitrogen gas into a power battery, and the pipeline is provided with an electromagnetic valve; the nitrogen protection controller comprises a sensor interface for collecting nitrogen gas pressure in the power battery, and is in control connection with the electromagnetic valve;
detecting the state of the vehicle, and if the vehicle is in a resting state and in a first set time period after charging is finished, supplying power to the nitrogen protection system, and executing a normal nitrogen filling logic by the nitrogen protection system; after the first set time period, supplying power to the nitrogen protection system according to a set time interval, and executing a normal nitrogen filling logic; if the power battery has the requirement of charging nitrogen, supplying power to the nitrogen protection system for prolonging a second set time period; if the power battery does not have the requirement of charging nitrogen, stopping supplying power to the nitrogen protection system;
the normal nitrogen filling logic is as follows: and if the difference value between the nitrogen gas pressure in the power battery and the external atmospheric pressure value is detected to be smaller than the minimum set air pressure standard, charging nitrogen gas into the power battery.
7. The power battery protection system according to claim 6, further comprising a nitrogen system power supply arranged independently, wherein the method for supplying power to the nitrogen protection system comprises the following steps: and awakening the power supply of the nitrogen system.
8. The power battery protection system of claim 7, wherein the nitrogen protection system is powered by the power battery and nitrogen system power supply in a vehicle parked charge state, performing normal nitrogen fill logic; and in the running state of the vehicle, the power battery supplies power for the nitrogen protection system, and the normal nitrogen charging logic is executed.
9. The power battery protection system of claim 8, wherein the normal nitrogen fill logic further comprises detecting a nitrogen reservoir pressure and controlling the nitrogen generation module to fill the nitrogen reservoir with nitrogen if the nitrogen reservoir pressure is below a set value.
10. The power battery protection system according to claim 9, further comprising a storage battery, wherein the storage battery is used for supplying power to the nitrogen protection system when the power battery fails during running of the vehicle, and charging nitrogen into the failed power battery at a large flow rate when the power battery is powered off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110686168.2A CN114889428A (en) | 2021-06-21 | 2021-06-21 | Power battery protection method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110686168.2A CN114889428A (en) | 2021-06-21 | 2021-06-21 | Power battery protection method and system |
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| CN114889428A true CN114889428A (en) | 2022-08-12 |
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| CN202110686168.2A Pending CN114889428A (en) | 2021-06-21 | 2021-06-21 | Power battery protection method and system |
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| CN111469709A (en) * | 2019-01-23 | 2020-07-31 | 郑州宇通重工有限公司 | Vehicle, power battery monitoring device and DC/DC module awakening method |
-
2021
- 2021-06-21 CN CN202110686168.2A patent/CN114889428A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0589908A (en) * | 1991-09-27 | 1993-04-09 | Ngk Insulators Ltd | Fire extinguishing appliance for sodium-sulfur cell |
| US20120002338A1 (en) * | 2009-02-10 | 2012-01-05 | Autoliv Development Ab | Safety arrangement for a motor vehicle |
| CN104300097A (en) * | 2014-06-24 | 2015-01-21 | 中航锂电（洛阳）有限公司 | Flame retardant battery box and flame retardant power battery system |
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Application publication date: 20220812 |