CN115295917A - Immersed energy storage battery thermal management system and fire control method - Google Patents
Immersed energy storage battery thermal management system and fire control method Download PDFInfo
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- CN115295917A CN115295917A CN202210759340.7A CN202210759340A CN115295917A CN 115295917 A CN115295917 A CN 115295917A CN 202210759340 A CN202210759340 A CN 202210759340A CN 115295917 A CN115295917 A CN 115295917A
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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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
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
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- H—ELECTRICITY
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
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- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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- H01M10/00—Secondary cells; Manufacture thereof
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- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses an immersed energy storage battery thermal management system and a fire control method, wherein the immersed energy storage battery thermal management system comprises a battery cabinet, an immersed circulation system and a battery management system, wherein the battery cabinet comprises at least one battery box, and a plurality of battery cores immersed in cooling liquid are contained in the battery box; the immersed circulation system is respectively connected with the battery boxes; the battery management system is used for judging whether the battery core generates the irreversible thermal runaway phenomenon or not and controlling the immersed circulation system to intermittently pump cooling liquid into the battery box where the battery core is positioned when a certain battery core generates the irreversible thermal runaway phenomenon, wherein in a time interval between every two times of pumping of the cooling liquid, the upper part of the battery core generating the thermal runaway phenomenon is always covered by the cooling liquid. The fire extinguishing system can overcome the problems and the defects of high fire extinguishing cost, poor response timeliness, low reliability and complex structure in the conventional energy storage battery fire extinguishing system.
Description
Technical Field
The invention relates to an immersed energy storage battery thermal management system and a fire control method, and belongs to the technical field of energy storage batteries.
Background
At present, the core of an energy storage system is a battery system, and generally, the battery system comprises hundreds of battery cells, and when a single battery cell is out of control thermally, a violent reaction may ignite surrounding battery cells, thereby causing a fire. At present, fire-fighting schemes equipped in the industry of energy storage batteries are generally a gas fire-fighting system and a water mist fire-fighting system, and the gas fire-fighting system can be divided into a heptafluoropropane and perfluorohexanone fire-fighting system. Further, formed gradually in the trade to the fire extinguishing system of battery module level, the cooling method of electricity core itself still is traditional cold drawing formula liquid cooling or air-cooled, when electric core thermal runaway, injects the coolant liquid through the fire control branch road that additionally adds and liquid reserve tank in to the battery module and realizes the submerged fire control.
Firstly, for a gas fire extinguishing system, the heptafluoropropane fire extinguishing system can only be used as a whole cabin level full-submerged fire extinguishing system, cannot directly act on a battery cell, has low fire extinguishing efficiency, does not have a cooling effect, and is easy to re-ignite; the perfluorohexanone fire extinguishing system can be used for battery module level fire control, but needs a matched spray head due to the fact that spraying needs better atomization, and the structure is complex. Secondly, for the water mist fire extinguishing system, although the cooling performance is better, the whole pressure of the system is high, and certain danger exists, meanwhile, the system still belongs to a whole cabin level full-submerged fire extinguishing system, and when local fire is extinguished, the water spraying failure of other electric cores can be caused, and the whole loss is larger.
Finally, the submerged fire fighting system, which is realized by injecting liquid into the module, has the following disadvantages:
when thermal runaway occurs, the injected water-based cooling liquid conducts electricity, so that other battery cells are easily short-circuited, and the fire is aggravated;
the cooling liquid injection is controlled by the electromagnetic valve, so that the problem of response timeliness exists, and once the electromagnetic valve fails, the cooling liquid can be sprayed onto other battery cells, so that short circuit is caused, and the reliability is low;
additionally add fire control pipeline and liquid reserve tank and can make overall structure complicated on original battery system basis, take up an area of the grow.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an immersed energy storage battery thermal management system which can overcome the problems and the defects of high fire extinguishing cost, poor response timeliness, low reliability and complex structure in the conventional energy storage battery fire-fighting system.
In order to solve the technical problems, the technical scheme of the invention is as follows: an immersed energy storage cell thermal management system comprising:
the battery cabinet comprises at least one battery box, and a plurality of battery cores immersed in cooling liquid are contained in the battery box;
the immersed circulation systems are respectively connected with the battery boxes;
the battery management system is used for judging whether the electric core generates the irreversible thermal runaway phenomenon or not and controlling the immersion type circulating system to intermittently pump cooling liquid into a battery box where the electric core is located when a certain electric core generates the irreversible thermal runaway phenomenon, wherein the cooling liquid is pumped into a time interval between every two times, and the upper part of the electric core where the thermal runaway phenomenon occurs is always covered by the cooling liquid.
Further, the submerged circulation system comprises:
an electromagnetic valve connected to a coolant inlet of the battery box;
the cooling liquid pipeline is internally provided with a liquid return pipeline, a liquid supply pipeline, a pump and a tank, the liquid supply pipeline is connected with each electromagnetic valve, and each cooling liquid outlet of the battery box is connected with the liquid return pipeline; wherein the content of the first and second substances,
the battery management system controls the corresponding electromagnetic valves to pump cooling liquid into the corresponding battery boxes;
the battery management system controls the amount of coolant pumped into the corresponding battery box by a pump.
Further, an external heat exchange device used for exchanging heat with the cooling liquid is further arranged in the cooling liquid pipeline.
Further, in order to monitor the running state of the immersion type circulating system, a liquid supply pressure sensor is arranged on the liquid supply pipeline;
and/or a liquid return pressure sensor is arranged on the liquid return pipeline.
Further, in order to prevent the pollutants generated during the thermal runaway of the battery cell from recharging into the battery box in a normal state, otherwise, the pollutants can cause the cooling environment of the battery cell 10 to be severe and influence the heat exchange effect, a check valve is connected between the cooling liquid outlet of the battery box and the liquid return pipeline.
Further, the upper end of the battery box is provided with an explosion-proof valve;
an alarm sensor is arranged above the battery cabinet and connected with the battery management system; the alarm sensor is suitable for triggering an alarm to send out an alarm signal and transmitting the alarm signal to the battery management system;
the alarm sensor is a smoke alarm and/or a combustible gas detector; wherein the content of the first and second substances,
the smoke alarm is suitable for being triggered by gas sprayed out of the battery box to send out an alarm signal when the gas pressure in the battery box is accumulated to a certain value;
the combustible gas detector is suitable for triggering alarm to send out an alarm signal when the concentration of the combustible gas in the battery cabinet reaches a certain value.
Further, the battery management system is also used for monitoring the surface temperature of the battery core in real time, calculating the change rate of the surface temperature of the battery core along with time, and judging the working state of the battery box according to the real-time monitoring of the surface temperature of the battery core, the change rate of the surface temperature of the battery core along with time and the alarm signal.
Further, the battery management system sends out alarm information according to the cell judgment condition.
Further, cooling liquid is intermittently pumped into a battery box where the battery cell is located through a pump, and the time interval between every two times of pumping of the cooling liquid is obtained through a formula (1);
The invention also provides a fire control method, wherein the battery cabinet comprises at least one battery box, a plurality of battery cores immersed in the cooling liquid are contained in the battery box, and the method comprises the following steps:
when an irreversible thermal runaway phenomenon occurs in a certain electric core, intermittently pumping cooling liquid into a battery box where the electric core is positioned; and in the time interval between every two times of pumping of the cooling liquid, the upper part of the battery cell where the thermal runaway phenomenon occurs is always covered by the cooling liquid.
Further, the conditions for judging the irreversible thermal runaway phenomenon of the battery core are as follows:
the battery cabinet is used for smoke alarm or combustible gas alarm, the surface temperature of the battery core is higher than 60 ℃, and the change rate of the surface temperature of the battery core along with time is higher than 1 ℃/s.
Further, the battery cabinet comprises a plurality of battery boxes;
when a certain electric core generates an irreversible thermal runaway phenomenon, the position of the electric core generating the thermal runaway phenomenon is positioned, the battery box where the electric core is positioned is determined, and the cooling liquid is stopped being pumped into other battery boxes.
Further, the method is realized based on the immersed energy storage battery thermal management system;
the upper end of the battery box is provided with an explosion-proof valve;
an alarm sensor is arranged above the battery cabinet and connected with the battery management system; the alarm sensor is suitable for triggering an alarm to send out an alarm signal and transmitting the alarm signal to the battery management system;
the alarm sensor is a smoke alarm and/or a combustible gas detector; wherein the content of the first and second substances,
the smoke alarm is suitable for being triggered by gas sprayed out of the battery box to send out an alarm signal when the gas pressure in the battery box is accumulated to a certain value;
the combustible gas detector is suitable for triggering alarm to send out an alarm signal when the concentration of the combustible gas in the battery cabinet reaches a certain value.
The battery management system is also used for monitoring the surface temperature of the battery cell in real time, calculating the change rate of the surface temperature of the battery cell along with time, and judging the working state of the battery box according to the real-time monitoring of the surface temperature of the battery cell, the change rate of the surface temperature of the battery cell along with time and an alarm signal;
when the battery management system does not receive the alarm signal and the change rate of the surface temperature of the battery core and the surface temperature of the battery core along with the time is not abnormal, the immersed energy storage battery thermal management system keeps normal operation: at the moment, the electromagnetic valves are all opened, and the pump operates according to rated working conditions;
when the battery management system receives the alarm signal and the change rate of the surface temperature of the battery core along with time are not abnormal, the battery management system sends out an alarm signal to remind related personnel to go to the site to check the situation, the electromagnetic valve is still kept in a fully opened state, and the pump still operates according to a rated working condition;
when the battery management system does not receive the alarm signal, but monitors that the surface temperature of the battery core is abnormal or the change rate of the surface temperature of the battery core along with time is abnormal, the battery management system 12 sends an alarm signal when the battery core is in the initial stage of thermal runaway, meanwhile, the electromagnetic valve is still kept in a fully opened state, the frequency of the pump is adjusted, the flow is increased, and the heat exchange and cooling of the battery core in the battery box are accelerated; and when the battery management system monitors that the surface temperature of the battery core and the change rate of the surface temperature along with the time are both recovered to be normal, canceling the alarm signal and adjusting the frequency of the pump to a rated working condition.
By adopting the technical scheme, the invention has the following beneficial effects:
1) Compared with the method of taking submerged cooling as fire fighting after the thermal runaway of the battery core, the immersed energy storage battery thermal management system takes the fluorinated liquid with high insulativity and heat exchange performance as the cooling liquid, can simultaneously take cooling and fire fighting purposes into consideration, and when the thermal runaway of the battery core occurs, a great amount of heat is rapidly taken away by utilizing the latent heat of evaporation when the fluorinated liquid boils, so that the immersed energy storage battery thermal management system is an active real-time fire fighting system, the response timeliness of fire fighting is good, an additional pipeline is not required to be added as a fire fighting pipeline, and the immersed energy storage battery thermal management system is simple in structure;
2) When thermal runaway occurs, the fire control method can ensure that the upper part of a thermal runaway cell is always covered by cooling liquid by only clicking a pump in the immersed energy storage battery thermal management system and utilizing the cooling liquid stored by the system, an additional liquid storage tank is not needed, and the linkage action after the thermal runaway occurs can not cause short circuit risk to other cells, so that the fire extinguishing cost can be effectively reduced, and the reliability of the system is also improved;
3) Whether the battery core is out of thermal control or not is judged jointly through the smoke alarm signal or the combustible gas alarm signal received by the battery management system and the surface temperature and the temperature change rate of the battery core, meanwhile, the pressure of liquid entering and exiting the battery box is monitored in real time, various bases for judging system abnormity are provided, the integral reliability of the system is improved, and unnecessary loss caused by misoperation is avoided.
Drawings
Fig. 1 is a schematic structural diagram of an immersed energy storage battery thermal management system according to the present invention;
fig. 2 is a schematic diagram of the internal structure dimensions of the battery box.
Detailed Description
In order that the manner in which the present invention is attained and can be understood in detail, a more particular description of the invention briefly summarized above may be had by reference to the embodiments thereof which are illustrated in the appended drawings.
As shown in fig. 1 to 2, an immersed energy storage battery thermal management system includes:
the battery cabinet 11, the battery cabinet 11 includes a plurality of battery boxes 9, and a plurality of electric cores 10 immersed in the cooling liquid 6 are accommodated in the battery boxes 9;
the immersed circulation systems are respectively connected with the battery boxes 9;
the battery management system 12 is configured to determine whether the electrical core 10 has an irreversible thermal runaway phenomenon, and control the immersion type circulation system to intermittently pump the cooling liquid 6 into the battery box 9 where the electrical core 10 is located when a certain electrical core 10 has the irreversible thermal runaway phenomenon, where in a time interval between two times of pumping of the cooling liquid 6, it is ensured that the upper side of the electrical core 10 where the thermal runaway phenomenon occurs is always covered by the cooling liquid 6.
In the present embodiment, a plurality of battery cases 9 are provided, but one battery case 9 may be provided.
In this embodiment, as shown in fig. 1, the immersion type circulation system may have the following structure: the method comprises the following steps:
electromagnetic valves V1-VN connected to the cooling liquid inlets of the corresponding battery boxes 9;
a liquid return pipeline 8, a liquid supply pipeline 7, a pump 1 and a tank 5 are arranged in the cooling liquid pipeline, the liquid supply pipeline 7 is connected with each electromagnetic valve, and each cooling liquid outlet of the battery box 9 is connected with the liquid return pipeline 8; wherein the content of the first and second substances,
the battery management system 12 controls the pump-in of the cooling liquid 6 into the corresponding battery box 9 by controlling the corresponding electromagnetic valve;
the battery management system 12 controls the amount of coolant pumped into the respective battery box 9 by the pump 1.
In this embodiment, the pump 1 may be a magnetic pump, and the tank 6 may be a surge tank.
Specifically, the cooling liquid 6 enters the battery cabinet 11 through the liquid supply pipeline 7, completely immerses the battery cell 10, takes away heat generated by the battery cell 10 in the operation process, enters the pump 1 through the liquid return pipeline 8, and the pump 1 conveys the cooling liquid 6 to the external heat exchange device 2 for heat dissipation and returns to the battery cabinet 11 through the liquid supply pipeline 7 again, so that an immersed circulation system is formed.
The cooling liquid 6 used in the immersion circulation system may be a fluorinated liquid.
As shown in fig. 1, an external heat exchange device 2 for exchanging heat with the cooling liquid is further disposed in the cooling liquid pipeline.
As shown in fig. 1, a liquid supply pressure sensor 3 is disposed on the liquid supply pipe 7, and a liquid return pressure sensor 4 is disposed on the liquid return pipe 8, so as to monitor the operation state of the immersion type circulation system.
In the present embodiment, as shown in fig. 1, the battery box 9 is provided with explosion-proof valves K1 to KN at the top, electromagnetic valves V1 to VN at the coolant inlet of the battery box 9, and check valves Z1 to ZN at the coolant outlet of the battery box 9. Taking the # 1 battery box 9 as an example: the explosion-proof valve K1 is arranged at the top, the electromagnetic valve V1 is arranged on the cooling liquid inlet, the check valve Z1 is arranged on the cooling liquid outlet, and the rest is done in sequence. The explosion-proof valve simultaneously prevents the housing of the battery box 9 from being ruptured due to excessive internal pressure. The effect of check valve is in preventing that the pollutant that produces when electric core thermal runaway from recharging into normal condition's battery box, otherwise the pollutant can make electric core 10's cooling environment bad, influences the heat transfer effect.
In the present embodiment, the battery case 9 has a sealed structure.
An alarm sensor is arranged above the battery cabinet 11 and is connected with the battery management system 12; the alarm sensor is adapted to trigger an alarm to emit an alarm signal and to communicate the alarm signal to the battery management system 12;
in this embodiment, the alarm sensor may include a smoke alarm T1 and a combustible gas detector T2; wherein the content of the first and second substances,
the smoke alarm is suitable for being triggered by gas sprayed out of the battery box 9 to send out an alarm signal when the pressure of the gas in the battery box 9 is accumulated to a certain value;
the combustible gas detector is suitable for triggering an alarm to send out an alarm signal when the concentration of the combustible gas in the battery cabinet 11 reaches a certain value.
The battery management system 12 is further configured to monitor the surface temperature of the battery cell 10 in real time, calculate a change rate of the surface temperature of the battery cell 10 with time, and determine the operating state of the battery box according to the real-time monitoring of the surface temperature of the battery cell 10, the change rate of the surface temperature of the battery cell 10 with time, the smoke trigger signal, and the combustible gas trigger signal.
The battery management system 12 may also send out warning information according to the cell determination condition.
The battery management system 12 integrates a cell temperature acquisition unit, and the battery management system 12 records a numerical value according to the position coordinates of the battery box 9 where the cell 10 is located, for example, the temperature T (1, j, T) =20 ℃, that is, the surface temperature of the jth cell of the 1# battery box at the time T is 20 ℃.
The invention discloses a fire control method, which relates to the following processes:
s1: the battery management system 12 monitors the surface temperature of the battery cell 10 in real time, calculates the change rate of the surface temperature of the battery cell 10 along with time, and monitors whether smoke exists in the battery cabinet 11 in real time by the smoke sensor T1, and the smoke reaches a certain concentration to send a smoke alarm signal; the combustible gas detector T2 monitors the concentration of the combustible gas in the battery cabinet 11 in real time, and when the concentration of the combustible gas reaches a certain concentration, a combustible gas alarm signal is sent out and transmitted to the battery management system 12;
s2, if the battery management system 12 does not receive the smoke alarm signal and the combustible gas alarm signal and the cell temperature and the temperature change rate are not abnormal, namely the cell surface temperature is between 15 ℃ and 35 ℃, and the change rate of the cell surface temperature along with time is less than 1 ℃/S, the system keeps normal operation. At the moment, all the electromagnetic valves V1-VN in the system are opened, and the pump 1 operates according to the rated working condition;
and S3, if the battery management system 12 receives the smoke alarm signal, but the surface temperature of the battery core is between 15 and 35 ℃, and the change rate of the surface temperature of the battery core along with the time is less than 1 ℃/S, the smoke sensor T1 is considered to be in misoperation due to smoke generated by the outside because the battery cabinet is a non-sealing structure. At the moment, the battery management system 12 sends an alarm signal to a background to remind related personnel to go to a site to check the situation, the electromagnetic valves V1-VN in the system are still kept in a fully opened state, and the pump 1 still operates according to a rated working condition;
s4, if the battery management system 12 does not receive the smoke alarm signal and the combustible gas alarm signal, but monitors that the surface temperature of the battery core is higher than 60 ℃ or the change rate of the surface temperature of the battery core along with time is higher than 1 ℃/S, and further finds that the values of the liquid supply pressure sensor 3 and the liquid return pressure sensor 4 have obvious rising trends, the battery management system 12 sends out an alarm signal to a background, and meanwhile, the frequency of the pump 1 is adjusted, the system flow is improved, the heat exchange and the temperature reduction of the battery core in the battery box are accelerated, the further thermal runaway phenomenon of the battery core is prevented, and at the moment, electromagnetic valves V1-VN in the system are still kept in a fully opened state. When the battery management system 12 monitors that the surface temperature of the battery core and the change rate of the surface temperature along with the time are both recovered to be normal, the alarm signal is cancelled, and the frequency of the pump 1 is adjusted to a rated working condition;
s5, if the battery management system 12 receives a smoke alarm signal or a combustible gas alarm signal, and simultaneously monitors that the surface temperature of the battery core is more than 60 ℃, and the change rate of the surface temperature of the battery core along with time is more than 1 ℃/S, and simultaneously can further find that the numerical values of the liquid supply pressure sensor 3 and the liquid return pressure sensor 4 are steeply increased, the irreversible battery core thermal runaway phenomenon is judged to be generated at the moment, and the following work is further carried out:
a) The specific position of the battery core where the thermal runaway occurs is positioned by the battery management system 12, the power supply of the direct current system of the battery cabinet 11 is turned off, and meanwhile, an audible and visual alarm is sent to a background;
b) The battery management system 12 closes the electromagnetic valves of the battery boxes corresponding to the other cells which are not thermally out of control, and only opens the electromagnetic valves of the battery boxes corresponding to the cells which are thermally out of control, for example, if it is determined that the jth cell of the # 1 battery box is thermally out of control, V2 to VN all need to be closed, and only V1 is kept in an open state;
c) The battery management system 12 switches the pump 1 in the submerged cooling system to the jog mode, i.e. the pump 1 is started each time with a time interval t1 and for a time period t2. The t1 can be obtained by a plurality of module thermal runaway tests, and it is required to ensure that the cooling liquid 6 above the battery cell does not volatilize completely due to the absorption of heat generated by the thermal runaway of the battery cell in the time interval; t2 can be calculated from the following equation:
In the step c), the reason why the pump 1 is switched to the inching mode when the battery core is in thermal runaway is as follows: when electric core takes place the thermal runaway, correspond the inside gas pressure accumulation to a definite value because thermal runaway electricity core relief valve is opened and the gas pressure that a large amount of exhanst gas of spun and 6 evaporation of coolant liquid produced of battery box, the explosion-proof valve that thermal runaway electricity core corresponds the battery box top can be opened, battery box and external intercommunication this moment, if pump 1 continues to keep the state of continuous operation, in the short time, a large amount of coolant liquid 6 can be by the blowout of explosion-proof valve K1 ~ KN department of opening to weaken fire control cooling effect. Therefore, the inching mode can maximally utilize the cooling liquid 6 stored in the surge tank 5 in the immersed cooling system to inhibit the thermal runaway behavior of the battery cell 10, and prolong the time for relevant personnel to deal with the fire.
The technical problems, technical solutions and advantages of the present invention have been described in detail with reference to the above embodiments, and it should be understood that the above embodiments are merely exemplary and not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. An immersed energy storage cell thermal management system, comprising:
a battery cabinet (11), wherein the battery cabinet (11) comprises at least one battery box (9), and a plurality of battery cores (10) immersed in the cooling liquid (6) are arranged in the battery box (9);
the immersed circulating systems are respectively connected with the battery boxes (9);
the battery management system (12), battery management system (12) are used for judging whether electric core (10) takes place irreversible thermal runaway phenomenon and control submergence formula circulation system and pump into coolant liquid (6) to battery box (9) that this electric core (10) were located intermittently when certain electric core (10) takes place irreversible thermal runaway phenomenon, wherein, in the time interval between every two pump-ins coolant liquid (6), guarantee that the electric core (10) top that takes place the thermal runaway phenomenon is covered by coolant liquid (6) all the time.
2. The submerged energy storage cell thermal management system of claim 1,
the submerged circulation system comprises:
an electromagnetic valve connected to a coolant inlet of the battery box (9);
the cooling system comprises a cooling liquid pipeline, wherein a liquid return pipeline (8), a liquid supply pipeline (7), a pump (1) and a tank (5) are arranged in the cooling liquid pipeline, the liquid supply pipeline (7) is connected with each electromagnetic valve, and each cooling liquid outlet of the battery box (9) is connected with the liquid return pipeline (8); wherein the content of the first and second substances,
the battery management system (12) controls the pump-in of the cooling liquid (6) into the corresponding battery box (9) by controlling the corresponding electromagnetic valve;
the battery management system (12) controls the amount of coolant pumped into the respective battery box (9) by means of the pump (1).
3. The submerged energy storage cell thermal management system of claim 2,
and an external heat exchange device (2) for exchanging heat with the cooling liquid is also arranged in the cooling liquid pipeline.
4. The submerged energy storage cell thermal management system of claim 2,
a liquid supply pressure sensor (3) is arranged on the liquid supply pipeline (7);
and/or a liquid return pressure sensor (4) is arranged on the liquid return pipeline (8).
5. The submerged energy storage cell thermal management system of claim 2,
and a one-way valve is connected between a cooling liquid outlet of the battery box (9) and the liquid return pipeline (8).
6. The submerged energy storage cell thermal management system of claim 1,
an explosion-proof valve is arranged at the upper end of the battery box (9);
an alarm sensor is arranged above the battery cabinet (11) and is connected with the battery management system (12); the alarm sensor is adapted to trigger an alarm to issue an alarm signal and to communicate the alarm signal to the battery management system (12);
the alarm sensor is a smoke alarm and/or a combustible gas detector; wherein the content of the first and second substances,
the smoke alarm is suitable for being triggered by gas sprayed out of the battery box (9) to send out an alarm signal when the gas pressure in the battery box (9) is accumulated to a certain value;
the combustible gas detector is suitable for triggering an alarm to send out an alarm signal when the concentration of the combustible gas in the battery cabinet (11) reaches a certain value.
7. The submerged energy storage cell thermal management system of claim 6,
the battery management system (12) is further used for monitoring the surface temperature of the battery core (10) in real time, calculating the change rate of the surface temperature of the battery core (10) along with time, and judging the working state of the battery box according to the real-time monitoring of the surface temperature of the battery core (10), the change rate of the surface temperature of the battery core (10) along with time and the alarm signal.
8. The submerged energy storage cell thermal management system of claim 1,
and the battery management system (12) sends out alarm information according to the battery cell judgment condition.
9. The submerged energy storage cell thermal management system of claim 1,
the cooling liquid (6) is intermittently pumped into a battery box (9) where the battery core (10) is positioned by a pump (1),
the time interval between every two times of pumping the cooling liquid (6) is obtained by the formula (1);
10. A fire fighting control method, characterized in that the method is applied to a battery cabinet (11), the battery cabinet (11) comprising at least one battery box (9), a plurality of electric cells (10) being immersed in a cooling liquid (6) being accommodated in the battery box (9), the method comprising the steps of:
when an irreversible thermal runaway phenomenon occurs in a certain battery cell (10), intermittently pumping cooling liquid (6) into a battery box (9) where the battery cell (10) is located; wherein, in the time interval between every two times of pumping the cooling liquid (6), the upper part of the battery cell (10) which generates the thermal runaway phenomenon is always covered by the cooling liquid (6).
11. A fire fighting control method according to claim 10,
the judgment condition for the irreversible thermal runaway phenomenon of the battery cell (10) is as follows:
the battery cabinet (11) is used for smoke alarm or gas alarm, the surface temperature of the battery core (10) is higher than 60 ℃, and the change rate of the surface temperature of the battery core along with time is higher than 1 ℃/s.
12. A fire fighting control method according to claim 10,
the battery cabinet (11) comprises a plurality of battery boxes (9);
when a certain battery cell (10) has an irreversible thermal runaway phenomenon, the position of the battery cell (10) with the thermal runaway phenomenon is positioned, the battery box (9) where the battery cell (10) is located is determined, and the pumping of cooling liquid (6) into other battery boxes (9) is stopped.
13. A fire fighting control method according to claim 10,
the method is implemented based on the submerged energy storage battery thermal management system according to any of claims 1 to 9.
14. A fire fighting control method according to claim 10,
the method is realized based on the immersed energy storage battery thermal management system according to any one of claims 2 to 5;
an explosion-proof valve is arranged at the upper end of the battery box (9);
an alarm sensor is arranged above the battery cabinet (11) and is connected with the battery management system (12); the alarm sensor is adapted to trigger an alarm to issue an alarm signal and to communicate the alarm signal to the battery management system (12);
the alarm sensor is a smoke alarm and/or a combustible gas detector; wherein, the first and the second end of the pipe are connected with each other,
the smoke alarm is suitable for being triggered by gas sprayed out of the battery box (9) to send out an alarm signal when the gas pressure in the battery box (9) is accumulated to a certain value;
the combustible gas detector is suitable for triggering alarm to send out an alarm signal when the concentration of the combustible gas in the battery cabinet (11) reaches a certain value;
the battery management system (12) is also used for monitoring the surface temperature of the battery core (10) in real time, calculating the change rate of the surface temperature of the battery core (10) along with time, and judging the working state of the battery box according to the real-time monitoring of the surface temperature of the battery core (10), the change rate of the surface temperature of the battery core (10) along with time and the alarm signal;
when the battery management system (12) does not receive the alarm signal and the change rate of the surface temperature of the battery core (10) and the surface temperature of the battery core (10) along with the time is not different, the immersed energy storage battery thermal management system keeps normal operation: at the moment, the electromagnetic valves are all opened, and the pump (1) operates according to a rated working condition;
when the battery management system (12) receives the alarm signal and the change rate of the surface temperature of the battery core (10) along with time are not different, the battery management system (12) sends out an alarm signal to remind relevant personnel to go to the site to check the situation, the electromagnetic valve is still kept in a fully opened state, and the pump (1) still operates according to the rated working condition;
when the battery management system (12) does not receive the alarm signal, but monitors that the surface temperature of the battery core (10) is abnormal or the change rate of the surface temperature of the battery core (10) along with time is abnormal, the battery management system (12) judges that the battery core (10) is in the initial stage of thermal runaway, sends out an alarm signal, simultaneously keeps the electromagnetic valve in a fully opened state, adjusts the frequency of the pump (1), improves the flow rate, and accelerates the heat exchange and cooling of the battery core (10) in the battery box (9); when the battery management system (12) monitors that the surface temperature of the battery core (10) and the change rate of the surface temperature along with time are both recovered to be normal, the alarm signal is cancelled, and the frequency of the pump (1) is adjusted to a rated working condition.
Priority Applications (2)
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| CN202210759340.7A CN115295917A (en) | 2022-06-29 | 2022-06-29 | Immersed energy storage battery thermal management system and fire control method |
| PCT/CN2023/108060 WO2024002383A1 (en) | 2022-06-29 | 2023-07-19 | Immersion energy storage battery thermal management system and fire control method |
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| CN202210759340.7A CN115295917A (en) | 2022-06-29 | 2022-06-29 | Immersed energy storage battery thermal management system and fire control method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115832473A (en) * | 2023-02-03 | 2023-03-21 | 江苏思贝尔海纳储能科技有限公司 | Novel energy storage system |
| CN116538743A (en) * | 2023-07-06 | 2023-08-04 | 常州博瑞电力自动化设备有限公司 | Control method of water chiller |
| CN116613420A (en) * | 2023-05-23 | 2023-08-18 | 陕西西涵京创热控科技有限公司 | New energy automobile comprehensive energy storage and thermal management system and detection method |
| WO2024002383A1 (en) * | 2022-06-29 | 2024-01-04 | 常州博瑞电力自动化设备有限公司 | Immersion energy storage battery thermal management system and fire control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010042122B4 (en) * | 2010-10-07 | 2019-02-28 | Audi Ag | Cooling device of a vehicle |
| CN109962187A (en) * | 2017-12-25 | 2019-07-02 | 郑州宇通客车股份有限公司 | A kind of power battery box, electrokinetic cell system and charging method |
| KR102031645B1 (en) * | 2019-06-02 | 2019-10-14 | 주식회사 스탠더드시험연구소 | Immersion Type Heat Control Device for Fire Protection of Energy Storage System and Operating Method thereof |
| CN113151846B (en) * | 2021-04-30 | 2021-11-19 | 重庆昕晟环保科技有限公司 | Method for controlling production flow of sodium hypochlorite generator |
| CN114335790A (en) * | 2021-11-24 | 2022-04-12 | 合肥国轩高科动力能源有限公司 | Energy storage battery pack-level immersed fire extinguishing system and battery thermal runaway detection method |
| CN114497802A (en) * | 2021-12-31 | 2022-05-13 | 常州博瑞电力自动化设备有限公司 | Immersed liquid-cooled battery energy storage system and working method thereof |
| CN115295917A (en) * | 2022-06-29 | 2022-11-04 | 常州博瑞电力自动化设备有限公司 | Immersed energy storage battery thermal management system and fire control method |
-
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- 2022-06-29 CN CN202210759340.7A patent/CN115295917A/en active Pending
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024002383A1 (en) * | 2022-06-29 | 2024-01-04 | 常州博瑞电力自动化设备有限公司 | Immersion energy storage battery thermal management system and fire control method |
| CN115832473A (en) * | 2023-02-03 | 2023-03-21 | 江苏思贝尔海纳储能科技有限公司 | Novel energy storage system |
| CN116613420A (en) * | 2023-05-23 | 2023-08-18 | 陕西西涵京创热控科技有限公司 | New energy automobile comprehensive energy storage and thermal management system and detection method |
| CN116613420B (en) * | 2023-05-23 | 2024-05-31 | 大工晖耀智能科技洛阳有限公司 | New energy automobile comprehensive energy storage and thermal management system and detection method |
| CN116538743A (en) * | 2023-07-06 | 2023-08-04 | 常州博瑞电力自动化设备有限公司 | Control method of water chiller |
| CN116538743B (en) * | 2023-07-06 | 2023-09-12 | 常州博瑞电力自动化设备有限公司 | Control method of water chiller |
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| WO2024002383A1 (en) | 2024-01-04 |
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