CN114796932B - Battery pack safety protection oxygen concentration control method, system and vehicle - Google Patents
Battery pack safety protection oxygen concentration control method, system and vehicle Download PDFInfo
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- CN114796932B CN114796932B CN202110712921.0A CN202110712921A CN114796932B CN 114796932 B CN114796932 B CN 114796932B CN 202110712921 A CN202110712921 A CN 202110712921A CN 114796932 B CN114796932 B CN 114796932B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/07—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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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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Abstract
The invention relates to a method, a system and a vehicle for controlling the safety protection oxygen concentration of a battery pack, wherein the method comprises the steps of judging whether replacement is needed according to the oxygen concentration in the battery pack when the vehicle is in a driving or charging state, if so, carrying out gas replacement in the battery pack to ensure that the oxygen concentration in the battery pack meets the requirement, and if not, judging whether to need to be inflated based on the pressure in the battery pack to ensure that the micro-positive pressure environment is maintained in the battery pack; when the vehicle is in a standing state, the battery pack is inflated based on the time when the vehicle wakes up, so that the pressure in the battery pack is in a micro-positive pressure environment.
Description
Technical Field
The invention belongs to the field of safety protection of power batteries of new energy vehicles, and particularly relates to a method and a system for controlling the concentration of safety protection oxygen of a battery pack and a vehicle.
Background
With the large-scale application of the lithium ion battery in new energy automobiles, the safety problem of the lithium ion battery is increasingly remarkable. The current internal environment of the battery pack applied to the new energy automobile is usually an air environment, and because a large amount of oxygen is contained in the air, when the battery pack has a safety problem, the risk of ignition and explosion of the battery pack is increased by the oxygen in the air.
Aiming at the risks, the current new energy automobiles are usually protected by a safety early warning system of a battery pack. The safety early warning system is mainly characterized in that a temperature sensor and a smoke sensor are arranged in a battery pack to monitor the running condition of the battery system, a gas fire extinguishing device such as heptafluoropropane and aerosol is arranged outside the battery pack, and fire is extinguished when the battery pack is out of control. A fire extinguishing method of a battery system and the battery system are disclosed in the Chinese patent application document with the application publication number of CN 109316687B. The battery system of this application includes battery management system BMS, battery module, gas sensor and extinguishing device. The BMS receives the concentration value of the inflammable and explosive gas collected by the gas sensor, determines a risk level according to the concentration value, and starts the fire extinguishing device to spray the fire extinguishing gas to the battery module through the fire extinguishing device when the risk level exceeds a first risk alarm value.
In the prior art, fire extinguishing treatment is often performed after thermal runaway, however, when abnormal signal feedback is not timely generated in case of thermal runaway, the fire extinguishing device cannot timely perform fire extinguishing treatment, so that ignition or explosion after thermal runaway of the battery pack is caused, and therefore, a protection method for effectively preventing the ignition or explosion after thermal runaway of the battery pack is not available in the prior art.
Disclosure of Invention
The invention provides a method, a system and a vehicle for controlling the concentration of safety protection oxygen of a battery pack, which are used for solving the problem that a protection method for effectively preventing ignition or explosion after thermal runaway of the battery pack is lacked in the prior art.
In order to solve the technical problems, the invention provides a method for controlling the safety protection oxygen concentration of a battery pack, which comprises the steps of judging whether replacement is needed according to the oxygen concentration in the battery pack when a vehicle is in a driving or charging state, if so, carrying out gas replacement in the battery pack so as to ensure that the oxygen concentration in the battery pack meets the requirements, and if not, judging whether to need to be inflated based on the pressure in the battery pack so as to ensure that the micro-positive pressure environment is maintained in the battery pack; when the vehicle is in a standing state, the battery pack is inflated based on the time when the vehicle wakes up, so that the pressure in the battery pack is in a micro-positive pressure environment.
The beneficial effects of the technical scheme are as follows: when the vehicle is in a driving or charging state, if the oxygen concentration or the pressure of the gas in the battery pack does not meet the requirement, the gas with the oxygen concentration meeting the requirement is input into the battery pack, and when the vehicle is in a standing state, the battery pack is inflated based on the time when the vehicle wakes up, so that the oxygen concentration of the gas in the battery pack is controlled to meet the requirement or be in a micro-positive pressure environment, and no matter what state the vehicle is in, the oxygen concentration in the battery pack of the vehicle can meet the set requirement, and further, ignition or explosion after thermal runaway of the battery pack is effectively prevented.
Further, in order to more accurately enable the oxygen concentration of the gas in the battery pack to meet the requirement, the invention provides a battery pack safety protection oxygen concentration control method, which comprises the steps of replacing according to the number of times of vehicle demand replacement, wherein the number of times of vehicle demand replacement is related to the previous standing time of a vehicle.
Further, in order to more accurately enable the oxygen concentration of the gas in the battery pack to meet the requirement, the invention provides a battery pack safety protection oxygen concentration control method, which comprises the steps that the number of times of replacement required by the vehicle is equal to the sum of the number of times of incomplete replacement when the vehicle is in a previous driving state or a charging state and the number of times of replacement determined by the previous standing time.
Further, in order to more accurately make the gas in the battery pack in the micro-positive pressure environment, the invention provides a method for controlling the safety protection oxygen concentration of the battery pack, which comprises the steps of judging whether to need to be inflated based on the pressure in the battery pack so as to maintain the micro-positive pressure environment in the battery pack, wherein the method comprises the following steps: and determining whether the pressure in the battery pack is smaller than a first pressure value in real time, if the pressure in the battery pack is not smaller than the first pressure value, not inflating, and if the pressure in the battery pack is smaller than the first pressure value, inflating the battery pack until the pressure in the battery pack is equal to a second pressure value, so that the battery pack is in a micro-positive pressure environment, wherein the first pressure value is smaller than the second pressure value.
Further, in order to more accurately make the gas in the battery pack of the vehicle in the standing state in the micro-positive pressure environment, the invention provides a method for controlling the safety protection oxygen concentration of the battery pack, which comprises the steps of inflating the battery pack based on the time when the vehicle wakes up so that the pressure in the battery pack is the micro-positive pressure environment, comprising the following steps: and judging whether the time of waking up the vehicle is greater than a time threshold after charging, if so, inflating the battery pack until the pressure in the battery pack is in a micro-positive pressure environment, and if not, inflating the battery pack once.
In order to solve the technical problems, the invention provides a battery pack safety protection oxygen concentration control system, which comprises a whole vehicle air compressor, a control unit and a control unit, wherein the whole vehicle air compressor is used for providing compressed air; the nitrogen manufacturing module is used for receiving the compressed air output by the whole-vehicle air compressor, generating target gas with the oxygen concentration meeting the target concentration, and conveying the target gas to the air storage cylinder and/or the battery pack; a gas reservoir for receiving and storing the target gas; the sensor module is arranged in the battery pack and is used for detecting the oxygen concentration and the pressure of the gas in the battery pack so as to generate an oxygen concentration signal and a pressure signal; the controller is used for judging the vehicle state and receiving the oxygen concentration signal and the pressure signal, judging whether replacement is needed or not based on the oxygen concentration signal if the vehicle state is a driving state or a charging state, if the vehicle state is the driving state or the charging state, controlling the nitrogen manufacturing module to perform gas replacement into the battery pack so that the oxygen concentration in the battery pack meets the requirement, and judging whether inflation is needed or not based on the pressure signal if the replacement is not needed so as to maintain a micro-positive pressure environment in the battery pack; when the vehicle is in a standing state, the battery pack is inflated based on the time when the vehicle wakes up, so that the pressure in the battery pack is in a micro-positive pressure environment.
Further, in order to more accurately enable the oxygen concentration of the gas in the battery pack to meet the requirement, the invention provides a battery pack safety protection oxygen concentration control system, which comprises the steps of replacing according to the number of times of replacement required by a vehicle, wherein the number of times of replacement required by the vehicle is equal to the sum of the number of times of incomplete replacement when the vehicle is in a previous driving or charging state and the number of times of replacement determined by the previous standing time.
Further, in order to more accurately make the gas in the battery pack of the vehicle in the standing state in the micro-positive pressure environment, the invention provides a battery pack safety protection oxygen concentration control system, which comprises the steps of judging whether to need to be inflated based on the pressure signal so as to make the battery pack maintain the micro-positive pressure environment, wherein the steps comprise: and the controller determines whether the pressure in the battery pack is smaller than a first pressure value in real time based on the pressure signal, if not, the battery pack is not inflated, if so, the battery pack is inflated until the pressure in the battery pack is equal to a second pressure value, so that the battery pack is in a micro-positive pressure environment, and the first pressure value is smaller than the second pressure value.
Further, in order to accurately obtain the gas meeting the target concentration of the oxygen concentration, the invention provides a battery pack safety protection oxygen concentration control system, which further comprises a flow limiting valve, wherein the flow limiting valve is used for connecting the nitrogen manufacturing module and the air storage cylinder, and the flow limiting valve is used for limiting the flow of the gas output by the nitrogen manufacturing module.
The invention also provides a vehicle which comprises the battery pack, and the vehicle further comprises the battery pack safety protection oxygen concentration control system.
Drawings
FIG. 1 is a flow chart of a method of controlling the concentration of oxygen for battery pack safety protection of the present invention;
FIG. 2 is a schematic block diagram of a battery pack safety shield oxygen concentration control system of the present invention;
fig. 3 is a schematic block diagram of a battery pack safety protection oxygen concentration control system of the present invention.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Embodiment of the method for controlling the safety protection oxygen concentration of the battery pack:
the embodiment provides a battery pack safety protection oxygen concentration control method. The method for controlling the safety protection oxygen concentration of the battery pack can be simply referred to as an oxygen concentration control method. The oxygen concentration control method according to the present embodiment can effectively prevent ignition or explosion after thermal runaway of the battery pack.
Fig. 1 is a flowchart of a method for controlling the concentration of oxygen for battery pack safety protection according to the present invention.
In this embodiment, the oxygen concentration control method includes determining a vehicle state. The vehicle states include a driving state, a charging state, and a stationary state. When the vehicle is in a driving state or a charging state, judging whether replacement is needed according to the oxygen concentration in the battery pack, if the replacement is needed, carrying out gas replacement in the battery pack so that the oxygen concentration in the battery pack meets the requirement, and if the replacement is not needed, judging whether inflation is needed based on the pressure in the battery pack so that the micro-positive pressure environment is maintained in the battery pack.
Specifically, as shown in fig. 1, it is determined whether the oxygen concentration in the battery pack satisfies the requirement, and if the oxygen concentration does not satisfy the requirement, it is necessary to replace the gas in the battery pack. If the vehicle needs replacement, the replacement is carried out according to the number of times of the replacement required by the vehicle. Wherein the number of vehicle demand permutations is related to the previous time of vehicle rest. The previous stationary time period of the vehicle is the stationary time period of the vehicle before the current driving or charging state. In addition, it is also necessary to confirm the number of incomplete replacements when the vehicle was previously driven or in a charged state. The number of incomplete replacements is the difference between the total number of replacements required in the previous driving or charging state and the number of replacements completed before entering the rest state. The number of vehicle demand permutations is equal to the sum of the number of outstanding permutations at the previous driving or charging state of the vehicle and the number of permutations determined by the previous rest period. The number of permutations determined by the previous rest period is, for example, twice the previous rest period. The number of vehicle demand permutations satisfies n1=n—n0+q×2. Where N1 represents the number of vehicle demand permutations. N represents the total number of permutations required for the previous driving or charging state. N is a non-negative number. N1 is less than or equal to N. And N1 is an integer, wherein if N1 obtained by calculation is a decimal, a corresponding integer is obtained by adopting an upward rounding mode. N0 represents the number of completed substitutions before entering the rest state. Q represents a resting period in hours. The replacement refers to filling the gas meeting the oxygen concentration requirement into a battery pack of the vehicle, and discharging unqualified gas from the battery pack. After performing N1 gas substitutions, the oxygen concentration of the gas atmosphere within the substitution cell package can be made to satisfy the target concentration. Thus, the oxygen concentration of the gas in the battery pack can be more accurately satisfied.
In this embodiment, as shown in fig. 1, if no replacement is required, the vehicle enters a micro-positive pressure inflation mode. In the micro-positive pressure inflation mode, whether inflation is needed or not is judged based on the pressure in the battery pack, so that the micro-positive pressure environment is maintained in the battery pack. Specifically, whether the pressure in the battery pack is smaller than a first pressure value is determined in real time, and if the pressure in the battery pack is not smaller than the first pressure value, no inflation is performed. And if the pressure in the battery pack is smaller than the first pressure value, charging the battery pack until the pressure in the battery pack is equal to the second pressure value. The first pressure value is less than the second pressure value. Under the condition, the battery pack can be controlled to be in a micro-positive pressure environment more accurately, so that the condition that oxygen in the external environment cannot enter the battery pack can be ensured, and the air environment with low oxygen concentration can be maintained in the driving or charging process. The micro-positive pressure environment in this embodiment means that the oxygen concentration in the gas satisfies the target concentration and the pressure of the gas is located within the closed interval of the first pressure value and the second pressure value. The first pressure value can be determined according to the accuracy of the pressure sensor, and the first pressure value ensures that the pressure in the battery pack is micro-positive pressure on the basis of considering the accuracy of the pressure sensor. For example, if the accuracy of the pressure sensor is ±0.2kPa, the first pressure value is larger than the absolute value of the accuracy of the pressure sensor, and a margin is maintained so that the electric box pressure can be ensured to be a micro positive pressure. When the accuracy of the pressure sensor is ±0.2kPa, the first pressure value may be 0.3kPa. The second pressure value is the maximum pressure difference value between the pressure value in the battery pack and the pressure value of the external environment in the micro-positive pressure environment. The second pressure value may be determined according to long-term withstand voltage reliability of the battery pack, the battery pack may be able to be under the second pressure value for a long period of time, and both reliability and sealability of the battery pack are not affected. For example, the micro positive pressure environment is 0.3kPa to 0.7kPa, the first pressure value is 0.3kPa, the second pressure value is 0.7kPa, the inflation is started when the pressure in the battery pack is below 0.3kPa, and the inflation is stopped until the pressure is above 0.7 kPa. In this embodiment, the pressure in the battery pack can be detected in real time by a pressure sensor provided in the battery pack. The oxygen concentration of the gas charged into the battery pack in the micro-positive pressure charging state meets the target concentration. The target concentration is lower than the minimum oxygen concentration required for the battery pack to self-ignite.
In this embodiment, as shown in fig. 1, if the vehicle is not driving or in a charged state (i.e., the vehicle is in a stationary state), the vehicle enters a stationary wake-up inflation mode. The standing awakening inflation mode refers to the operation of awakening and powering up a vehicle in a standing state and inflating the vehicle after awakening and powering up the vehicle. And (5) utilizing a standing awakening inflation mode so as to control the pressure in the battery pack to be in a micro-positive pressure environment. And in the standing awakening inflation mode, the battery pack is inflated based on the time when the vehicle wakes up, so that the pressure in the battery pack is in a micro-positive pressure environment. Specifically, whether the time of vehicle awakening is larger than a time threshold after charging is judged, if yes, the battery pack is inflated in a normal mode until the pressure in the battery pack is in a micro-positive pressure environment, and if not, the battery pack is inflated in a normal mode once. The duration threshold may be, for example, 2 hours. A normal mode inflation may refer to, for example, an inflation performed once for a preset period of time. In this embodiment, after entering the standing wake-up inflation mode, the vehicle will wake up and power up at regular time. This makes it possible to more accurately place the gas in the battery pack of the vehicle in the state of rest in a micro-positive pressure environment.
In this embodiment, if the time of waking up the vehicle is greater than the time threshold after charging, it indicates that the vehicle is standing for a long time, in which case, oxygen in the environment may enter the battery pack through the sealing interface of the battery pack and the vent valve, and then enter the normal mode for inflation. Under normal mode inflation, the gas in the gas storage cylinder is utilized to replace the inside of the battery pack, if the gas in the gas storage cylinder is insufficient, the vehicle is waited to be converted into a driving state or a charging state from a standing state, and then the gas in the battery pack is replaced continuously until the oxygen concentration of the gas environment in the battery pack meets the target concentration. The number of substitutions and the time of rest are positively correlated. For example, when the vehicle is left standing for a hours and the battery pack is inflated a1 time by the gas in the gas cylinder and a1 < a, the vehicle is changed from the left standing state to the running state or the charging state, and the replacement of the battery pack a-a1 times is continued. If the vehicle is allowed to stand for B hours again and the replacement is required B times, the number of times of replacement is counted up to a-a1+b times. The upper limit value of the cumulative number of replacement is P times. Because the concentration and the pressure change of the vehicle under different environmental temperature working conditions and different battery temperature states have differences, P and the number of replacement times generated by standing are the maximum value under each working condition, thereby ensuring that the oxygen concentration in the battery pack meets the target concentration under each working condition.
In this embodiment, if the vehicle is a new vehicle that is taken off line, since the new vehicle is taken off line, the initial gas environment state in the battery pack is an air environment, the air environment in the battery pack needs to be replaced initially, the gas with the oxygen concentration meeting the requirement is filled into the battery pack, the unqualified gas in the battery pack is replaced out, and C is the test result under different environmental conditions after C times of replacement, so as to ensure that the oxygen concentration meets the target requirement. The oxygen concentration in the battery pack can be detected in real time by an oxygen concentration sensor provided in the battery pack.
In this embodiment, after the replacement is completed, the gas environment in the battery pack is also required to be maintained, and the gas with the oxygen concentration meeting the target concentration is filled into the battery pack to control the inside of the battery pack to be in a positive pressure environment, so that oxygen in the external air cannot enter the battery pack. The pressure within the battery pack is detected by a pressure sensor disposed within the battery pack.
According to the oxygen concentration control method, when a vehicle is in a driving state or a charging state, if the oxygen concentration or the pressure of gas in the battery pack does not meet the requirements, the gas with the oxygen concentration meeting the requirements is input into the battery pack, and when the vehicle is in a standing state, the battery pack is inflated based on the time when the vehicle wakes up, so that the oxygen concentration of the gas in the battery pack is controlled to meet the requirements or be in a micro-positive pressure environment, and the oxygen concentration in the battery pack of the vehicle can meet the set requirements no matter what state the vehicle is in, so that ignition or explosion after thermal runaway of the battery pack is effectively prevented.
Battery pack safety protection oxygen concentration control system embodiment:
the embodiment discloses a battery pack safety protection oxygen concentration control system. The battery pack safety protection oxygen concentration control system can be simply called an oxygen concentration control system. The oxygen concentration control system based on the embodiment can control the oxygen concentration in the battery pack, and effectively prevent ignition or explosion after thermal runaway of the battery pack. The oxygen concentration control system of the embodiment can realize the method for controlling the safety protection oxygen concentration of the battery pack in the method embodiment of the invention.
Fig. 2 is a schematic block diagram of a battery pack safety protection oxygen concentration control system of the present invention. Fig. 3 is a schematic block diagram of a battery pack safety protection oxygen concentration control system of the present invention. In this embodiment, as shown in fig. 2, the battery pack safety protection oxygen concentration control system 10 may include a whole vehicle air compressor 11, a nitrogen manufacturing module 12, an air cylinder 13, a sensor module 14, and a controller 15. The whole air compressor 11 may be used to provide compressed air. The compressed air may be air having a preset pressure. The nitrogen manufacturing module 12 may be configured to receive the compressed air output from the air compressor 11 of the whole vehicle and generate a target gas having an oxygen concentration satisfying a target concentration, and deliver the target gas to the air cylinder 13 and/or the battery pack 20. The target concentration is lower than the minimum oxygen concentration required for autoignition of the battery pack 20. The corresponding target concentrations for different types of vehicles may be different. The preset pressure is greater than or equal to the set operating pressure. The received air may be separated in the nitrogen manufacturing module 12. The nitrogen production module 12 may perform a separation process on the received air at a set operating pressure to generate a target gas having an oxygen concentration that meets a target concentration. The gas cylinder 13 may receive and store a target gas. The sensor module 14 may be disposed in the battery pack 20 and configured to detect an oxygen concentration and a pressure of a gas within the battery pack 20 to generate an oxygen concentration signal and a pressure signal.
In some embodiments, the outlet valve of the nitrogen production module 12 may restrict the flow of the output gas or the inlet valve of the gas receiver 13 may restrict the flow of the received gas. Thus, a gas satisfying the target concentration of oxygen can be obtained more accurately.
In this embodiment, the battery pack 20 may include an intake valve and a ventilation valve. The intake valve may receive the target gas from the nitrogen production module 12 or the gas cylinder 13. A ventilation valve may be used to vent the gas.
In the present embodiment, the controller 15 may be configured to determine a vehicle state and receive an oxygen concentration signal and a pressure signal. If the vehicle state is a driving state or a charging state, whether replacement is necessary is determined based on the oxygen concentration signal, and if replacement is necessary, the nitrogen gas manufacturing module 12 is controlled to perform gas replacement into the battery pack 20 so that the oxygen concentration in the battery pack satisfies the requirement. When the gas replacement is performed, the replacement is performed according to the number of vehicle demand replacement times, which is equal to the sum of the number of incomplete replacement times when the vehicle was in a previous driving or charging state and the number of replacement times determined by the previous standing time. For example, the number of vehicle demand permutations is equal to the sum of the number of outstanding permutations of the vehicle in the previous driving or state of charge and twice the previous rest period. The replacement is directed to filling the battery pack 20 with a gas that meets the concentration requirements and to discharging the off-specification gas from the gas-permeable valve of the battery pack 20. If no replacement is needed, judging whether inflation is needed based on the pressure signal so as to maintain the micro-positive pressure environment in the battery pack. If the inflation controller 15 is required, the air cylinder 13 is controlled to inflate the battery pack 20. Specifically, the controller 15 may determine whether inflation is required based on the pressure signal, so that the maintenance of the micro-positive pressure environment in the battery pack specifically means: the controller 15 determines in real time whether the pressure in the battery pack is less than a first pressure value based on the pressure signal, if not, the battery pack is not inflated, if so, the battery pack is inflated until the pressure in the battery pack is equal to a second pressure value, so that the battery pack is in a micro-positive pressure environment, and the first pressure value is less than the second pressure value. When the vehicle is in a standing state, the battery pack is inflated based on the time when the vehicle wakes up, so that the pressure in the battery pack is in a micro-positive pressure environment. The specific determination method is described in detail in the above method embodiment, and those skilled in the art can understand the determination manner of the controller 15 according to the oxygen concentration control method, which is not described herein.
In the present embodiment, if the controller 15 confirms that the vehicle is a new vehicle that is coming off line, an initial replacement is performed. Reference may be made specifically to corresponding descriptions in the method embodiments, and details are not repeated here.
In the present embodiment, if the controller 15 confirms that the vehicle is replaced, it is necessary to maintain the gas atmosphere in the battery pack 20 to control the positive pressure atmosphere in the battery pack 20. Reference may be made specifically to corresponding descriptions in the method embodiments, and details are not repeated here.
In this embodiment, the oxygen concentration control system 10 may also include a restrictor valve 16. A restrictor valve 16 is used to connect the nitrogen making module 12 and the gas cylinder 13. The flow restrictor valve 16 restricts the flow of gas output from the nitrogen production module 12. Thus, a gas satisfying the target concentration of oxygen can be obtained more accurately.
In this embodiment, the nitrogen manufacturing module 12 and the restrictor valve 16 may constitute a nitrogen separation device. The nitrogen separation device is capable of producing a gas having an oxygen concentration satisfying a target concentration at a set operating pressure and a set flow rate. For example, with a nitrogen separation device with a separation capacity of 3L/min at a set working pressure of 7bar, the preset pressure of air provided by the whole air compressor 11 is greater than or equal to 7bar. The nitrogen production module 12 performs a separation process on the received air at 7bar. The flow limiting valve 16 controls the flow rate within 3L/min at 7bar to ensure that the target gas is obtained with an oxygen concentration that meets the target concentration.
In this embodiment, the vehicle may wake up for 24 hours during the rest, and charge the battery pack 20 with the gas stored in the gas cylinder 13.
According to the oxygen concentration control system 10 of the present embodiment, the oxygen concentration in the air is filtered to generate the gas with the oxygen concentration meeting the requirement, and the gas meeting the requirement is judged to be filled into the battery pack in the driving, charging and vehicle standing states, so that the oxygen concentration in the battery pack 20 is within the required range, thereby controlling the oxygen concentration in the battery pack 20 and effectively preventing the ignition or explosion of the battery pack 20 after thermal runaway.
Vehicle embodiment:
the present embodiment also provides a vehicle that may include the battery pack safety protection oxygen concentration control system 10 and the battery pack 20 in the system embodiment of the present invention. This can control the oxygen concentration in the battery pack 20, and effectively prevent ignition or explosion after thermal runaway of the battery pack. The vehicles in this embodiment include, but are not limited to, transportation vehicles such as cars, coaches, vans, and the like.
Claims (6)
1. A method for controlling the concentration of oxygen for safety protection of a battery pack, comprising the steps of:
when the vehicle is in a driving state or a charging state, judging whether replacement is needed according to the oxygen concentration in the battery pack, if so, carrying out gas replacement in the battery pack so that the oxygen concentration in the battery pack meets the requirement, and if not, judging whether inflation is needed based on the pressure in the battery pack so as to maintain a micro-positive pressure environment in the battery pack; if the replacement is needed, the replacement is carried out according to the required replacement times of the vehicle, wherein the required replacement times of the vehicle are equal to the sum of the incomplete replacement times of the vehicle in the previous driving or charging state and the replacement times determined by the previous standing time; when the vehicle is in a standing state, the step of inflating the battery pack based on the time when the vehicle wakes up so that the pressure in the battery pack is in the micro-positive pressure environment, and inflating the battery pack based on the time when the vehicle wakes up so that the pressure in the battery pack is in the micro-positive pressure environment comprises the following steps: and judging whether the time of waking up the vehicle is greater than a time threshold after charging, if so, inflating the battery pack until the pressure in the battery pack is in a micro-positive pressure environment, and if not, inflating the battery pack once.
2. The method of claim 1, wherein the step of determining whether inflation is required based on the pressure in the battery pack to maintain a micro-positive pressure environment in the battery pack comprises: and determining whether the pressure in the battery pack is smaller than a first pressure value in real time, if the pressure in the battery pack is not smaller than the first pressure value, not inflating, and if the pressure in the battery pack is smaller than the first pressure value, inflating the battery pack until the pressure in the battery pack is equal to a second pressure value, so that the battery pack is in a micro-positive pressure environment, wherein the first pressure value is smaller than the second pressure value.
3. A battery pack safety protection oxygen concentration control system, comprising:
the whole vehicle air compressor is used for providing compressed air;
the nitrogen manufacturing module is used for receiving the compressed air output by the whole-vehicle air compressor, generating target gas with the oxygen concentration meeting the target concentration, and conveying the target gas to the air storage cylinder and/or the battery pack;
a gas reservoir for receiving and storing the target gas;
the sensor module is arranged in the battery pack and is used for detecting the oxygen concentration and the pressure of the gas in the battery pack so as to generate an oxygen concentration signal and a pressure signal;
the controller is used for judging the vehicle state and receiving the oxygen concentration signal and the pressure signal, judging whether replacement is needed or not based on the oxygen concentration signal if the vehicle state is a driving state or a charging state, if the vehicle state is the driving state or the charging state, controlling the nitrogen manufacturing module to perform gas replacement into the battery pack so that the oxygen concentration in the battery pack meets the requirement, and judging whether inflation is needed or not based on the pressure signal if the replacement is not needed so as to maintain a micro-positive pressure environment in the battery pack; if the replacement is needed, the replacement is carried out according to the required replacement times of the vehicle, wherein the required replacement times of the vehicle are equal to the sum of the incomplete replacement times of the vehicle in the previous driving or charging state and the replacement times determined by the previous standing time; when the vehicle is in a standing state, the step of inflating the battery pack based on the time when the vehicle wakes up so that the pressure in the battery pack is in the micro-positive pressure environment, and inflating the battery pack based on the time when the vehicle wakes up so that the pressure in the battery pack is in the micro-positive pressure environment comprises the following steps: and judging whether the time of waking up the vehicle is greater than a time threshold after charging, if so, inflating the battery pack until the pressure in the battery pack is in a micro-positive pressure environment, and if not, inflating the battery pack once.
4. The battery pack safety shield oxygen concentration control system of claim 3, wherein the step of determining whether inflation is required based on the pressure signal to maintain a micro positive pressure environment within the battery pack comprises: and the controller determines whether the pressure in the battery pack is smaller than a first pressure value in real time based on the pressure signal, if not, the battery pack is not inflated, if so, the battery pack is inflated until the pressure in the battery pack is equal to a second pressure value, so that the battery pack is in a micro-positive pressure environment, and the first pressure value is smaller than the second pressure value.
5. The battery pack safety protection oxygen concentration control system of claim 3, further comprising a flow limiting valve for connecting the nitrogen manufacturing module and the gas reservoir, the flow limiting valve limiting the flow of gas output by the nitrogen manufacturing module.
6. A vehicle comprising a battery pack, wherein the vehicle further comprises the battery pack safety shield oxygen concentration control system of any one of claims 3-5.
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| KR20110070381A (en) * | 2009-12-18 | 2011-06-24 | 콘티넨탈 오토모티브 시스템 주식회사 | Method for controlling battery of vehicle |
| CN107871836A (en) * | 2017-12-21 | 2018-04-03 | 张家港清研再制造产业研究院有限公司 | A kind of lithium-ion battery systems safety protection device and method |
| CN208256783U (en) * | 2018-03-29 | 2018-12-18 | 中信国安盟固利动力科技有限公司 | It is a kind of fill anti-flammability gas, degree of protection meets the battery pack of IP67 or more |
| CN111092269A (en) * | 2020-01-06 | 2020-05-01 | 烟台创为新能源科技有限公司 | Explosion suppression device and method for lithium ion battery box |
| CN111731149B (en) * | 2020-06-30 | 2021-10-12 | 广州小鹏汽车科技有限公司 | Battery control method and device and battery management system |
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