CN220984629U - Lithium battery protection device - Google Patents
Lithium battery protection device Download PDFInfo
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- CN220984629U CN220984629U CN202322703551.1U CN202322703551U CN220984629U CN 220984629 U CN220984629 U CN 220984629U CN 202322703551 U CN202322703551 U CN 202322703551U CN 220984629 U CN220984629 U CN 220984629U
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- lithium battery
- explosion
- thermal runaway
- protection device
- pressure
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 189
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 189
- 230000007246 mechanism Effects 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 21
- 239000002826 coolant Substances 0.000 claims abstract description 20
- 238000003860 storage Methods 0.000 claims abstract description 14
- 238000005507 spraying Methods 0.000 claims abstract description 7
- 238000004880 explosion Methods 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 125000006850 spacer group Chemical group 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 7
- 238000013022 venting Methods 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000000443 aerosol Substances 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 12
- 239000007789 gas Substances 0.000 description 35
- 238000000034 method Methods 0.000 description 16
- 230000006870 function Effects 0.000 description 7
- 238000000926 separation method Methods 0.000 description 7
- 239000003245 coal Substances 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 description 5
- 239000001257 hydrogen Substances 0.000 description 5
- 229910052739 hydrogen Inorganic materials 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000003111 delayed effect Effects 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- WVSNNWIIMPNRDB-UHFFFAOYSA-N 1,1,1,3,3,4,4,5,5,6,6,6-dodecafluorohexan-2-one Chemical compound FC(F)(F)C(=O)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F WVSNNWIIMPNRDB-UHFFFAOYSA-N 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
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Abstract
The application discloses a lithium battery protection device, which comprises: the cooling mechanism comprises a storage tank for storing cooling agents, a nozzle for spraying the cooling agents to the lithium battery and a pipeline for conveying the cooling agents to the nozzle, and the nozzle is installed corresponding to the position of the lithium battery; the controller acquires lithium battery parameters from the battery management system and controls the nozzle to locally cool the lithium battery with the first thermal runaway and without the second thermal runaway; and the explosion-proof shell is used for installing the lithium battery pack, the cooling mechanism and the controller. The application can effectively delay and inhibit the thermal runaway reaction of the lithium battery so as to better protect the lithium battery.
Description
Technical Field
The application relates to the technical field of lithium battery protection, in particular to a lithium battery protection device.
Background
The intelligent equipment and the automation equipment are widely applied to underground coal mines, the power source of the intelligent equipment and the automation equipment is mainly a lithium battery, the lithium battery has inherent risk of thermal runaway, if the lithium battery has thermal runaway, on one hand, exothermic chemical reaction beyond normal charge-discharge electrochemical reaction can occur in the lithium battery, so that the temperature of the lithium battery is increased, the occurrence of abnormal chemical reaction and the damage to the structure of the lithium battery are further promoted, a large amount of mixed gas can be generated in the process, the mixed gas has stronger combustibility, when sparks occur or a certain high temperature is reached, the danger of burning and even explosion can occur, on the other hand, the lithium battery with thermal runaway can continuously transfer heat outwards, and when the adjacent lithium battery reaches a certain temperature, the thermal runaway can also occur, so that the thermal diffusion phenomenon can occur, and the risks and hazards in all aspects can be multiplied. When the lithium battery is used in explosive places such as underground coal mines, the potential safety hazard is more serious.
In order to protect a lithium battery used in a coal mine underground, chinese patent CN202110115708.1 discloses a protection method of inert gas when an explosion-proof lithium battery power supply burns, when the lithium battery catches fire and explodes, oxygen is isolated by the inert gas, so as to reduce, eliminate or weaken the explosion intensity of the lithium battery, in addition, the sealing liquid and the flame arrester cool down and extinguish the burning flame of the lithium battery, so that the explosion of external explosives is not caused and induced, but the following defects exist in the above patent:
(1) The battery thermal runaway risk cannot be dealt with as early as possible, the dealing method is passive, the protection effect can be exerted after the lithium battery is endangered due to thermal runaway, specifically, when the lithium battery generates high pressure due to thermal runaway, after a certain pressure is reached in the sealing cavity, the high-pressure gas check valves 7 and 8 can be opened, flame cooling and flame isolation are carried out, and therefore the lithium battery is protected;
(2) The effect of inhibiting the thermal runaway of the lithium battery is poor, specifically, the patent only cools the flame which generates gas and propagates along with the gas when the thermal runaway of the lithium battery occurs, and the flame only has a certain acceleration effect on the thermal runaway reaction process of the lithium battery, so that the inhibiting flame can not delay the progress of the thermal runaway reaction;
(3) The lithium battery explosion-proof housing is required to be redesigned to achieve the protection function, and on the other hand, the sealing cavity with the airtight level of inert gas is required to be constructed and the liquid sealing assembly is adopted, so that the lithium battery explosion-proof housing is more complex in structure, the weight of the lithium battery is increased, the energy density of a power supply is reduced, the manufacturing cost and the maintenance cost of the power supply are greatly increased, and the lithium battery explosion-proof housing is unfavorable for being widely applied to underground coal mines.
Content of the application
The embodiment of the application provides a lithium battery protection device, which is used for cooling a lithium battery by a cooling mechanism in early thermal runaway of the lithium battery, so that the thermal runaway reaction of the lithium battery is effectively delayed and inhibited, and the lithium battery is better protected.
Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application.
According to a first aspect of an embodiment of the present application, there is provided a lithium battery protection device including:
The cooling mechanism comprises a storage tank for storing cooling agents, a nozzle for spraying the cooling agents to the lithium battery and a pipeline for conveying the cooling agents to the nozzle, and the nozzle is installed corresponding to the position of the lithium battery;
The controller is used for acquiring lithium battery parameters from the battery management system and controlling the nozzle to locally cool the lithium battery with the first thermal runaway and without the second thermal runaway;
And the explosion-proof shell is used for installing the lithium battery pack, the cooling mechanism and the controller.
In some embodiments of the present application, based on the foregoing scheme, the method further includes:
the pressure release mechanism is used for releasing pressure from the inside of the flameproof shell to the outside of the flameproof shell.
In some embodiments of the present application, based on the foregoing solution, the pressure release mechanism includes a pressure release pipe penetrating through the flameproof housing to communicate the inside and the outside of the flameproof housing, where the pressure release pipe is sequentially provided with a rupture disk, a venting structure and a transfer blocking structure from the outside of the flameproof housing to the inside of the flameproof housing, where the rupture disk is used to seal an outlet of the pressure release pipe located outside the flameproof housing, and the venting structure is used to vent the pressure gas exhausted inside the flameproof housing, and the transfer blocking structure transfers the pressure gas exhausted inside the flameproof housing to the venting structure and blocks impurities therein.
In some embodiments of the present application, based on the foregoing solution, the explosion venting structure includes:
the positioning shafts are arranged inside the pressure relief pipe and are axially distributed along the pressure relief pipe;
The corrugated net is filled between the positioning shaft and the pressure relief pipe, the inner side of the corrugated net is wound on the positioning shaft in a fixed connection mode, and the outer side of the corrugated net is fixedly connected with the pressure relief pipe.
In some embodiments of the application, based on the foregoing, the transfer barrier structure comprises at least one septum partially enclosing the pressure relief tube.
In some embodiments of the application, based on the foregoing, when the number of septa is greater than two, a partial septa closes an upper portion of the pressure relief tube and a partial septa closes a lower portion of the pressure relief tube.
In some embodiments of the present application, based on the foregoing scheme, the method further includes:
And the flame-extinguishing mechanism is used for extinguishing flame in the flameproof shell.
In some embodiments of the application, based on the foregoing, the flame-out mechanism comprises:
the aerosol fire extinguisher is connected with the controller, and the outlet is communicated with the inside of the flameproof shell through a pipeline.
In some embodiments of the present application, based on the foregoing scheme, the method further includes:
And the temperature detection mechanism is connected with the controller and used for detecting the temperature inside the explosion-proof shell.
In some embodiments of the present application, based on the foregoing, the temperature detecting mechanism includes:
And the temperature sensor is arranged inside the explosion-proof shell.
In some embodiments of the present application, based on the foregoing scheme, the method further includes:
And the combustible gas concentration detection mechanism is connected with the controller and used for detecting the concentration of the combustible gas in the explosion-proof shell.
In some embodiments of the present application, based on the foregoing, the combustible gas concentration detection mechanism includes:
The hydrogen sensor is used for detecting the concentration of hydrogen in the explosion-proof shell;
And the carbon monoxide sensor is used for detecting the concentration of carbon monoxide in the explosion-proof shell.
In some embodiments of the present application, the controller obtains lithium battery parameters from the battery management system, where the lithium battery parameters include voltage, current and temperature of the lithium battery, and when it is determined that thermal runaway occurs in the lithium battery according to the lithium battery parameters, the nozzle is controlled, and the cooling agent is sprayed to the lithium battery through the nozzle, so that thermal runaway reaction of the lithium battery can be effectively delayed and inhibited, so as to better protect the lithium battery.
According to a second aspect of an embodiment of the present application, there is provided a lithium battery protection method, including:
Acquiring a first thermal runaway condition and a second thermal runaway condition;
acquiring lithium battery parameters from a battery management system in real time to obtain the lithium battery parameters;
according to lithium battery parameters, through first thermal runaway condition, carry out first thermal runaway judgement, if there is first thermal runaway, then through second thermal runaway condition, carry out second thermal runaway judgement, if there is not second thermal runaway, control nozzle carries out the local cooling to the lithium battery that there is first thermal runaway, inform battery management system to close the charge and discharge function of the lithium battery that there is first thermal runaway and there is not second thermal runaway, if there is second thermal runaway, control nozzle carries out comprehensive cooling to lithium battery group.
In some embodiments of the application, based on the foregoing, if there is a second thermal runaway, the flame-trap mechanism is controlled to eliminate the flame inside the flameproof housing.
In some embodiments of the application, based on the foregoing, the first thermal runaway condition is one or more of a lithium battery temperature being greater than a first temperature threshold, a difference between the temperature of the lithium battery and the temperature of other lithium batteries being greater than a first temperature difference, a lithium battery voltage being greater than a preset voltage, a lithium battery current being greater than a preset current, and a flammable gas concentration being greater than zero.
In some embodiments of the application, based on the foregoing aspects, the second thermal runaway condition is one or more of the following conditions:
The lithium battery temperature is greater than a second temperature threshold;
The voltage drop value of the lithium battery is larger than the preset voltage drop value, the temperature rise rate of the lithium battery is larger than the preset temperature rise rate, and the duration exceeds the preset duration;
the temperature of the lithium battery is greater than a first preset temperature, the rate of temperature rise of the lithium battery is greater than a preset rate of temperature rise, and the duration exceeds a preset duration;
the temperature in the flameproof housing is greater than a second temperature threshold, which is greater than the first temperature threshold.
In some embodiments of the present application, based on the foregoing scheme, the method further includes:
detecting the concentration of the combustible gas in the explosion-proof shell through a combustible gas concentration detection mechanism;
detecting the temperature inside the explosion-proof shell through a temperature detection mechanism;
When the pressure inside the flameproof shell is larger than the preset pressure, the pressure release mechanism releases pressure from the inside of the flameproof shell to the outside of the flameproof shell.
In some embodiments of the present application, based on the foregoing scheme, the method further includes:
When the pressure inside the flameproof shell is larger than the preset pressure, the pressure release mechanism releases pressure from the inside of the flameproof shell to the outside of the flameproof shell.
The advantages of the embodiments of the second aspect may be referred to the advantages of the embodiments of the first aspect and the embodiments of the first aspect, and will not be described here again.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
fig. 1 is a schematic front view of a lithium battery protection device according to an embodiment of the present application;
fig. 2 is a schematic side view of a lithium battery protection device according to an embodiment of the present application;
Fig. 3 is a flowchart illustrating a method for protecting a lithium battery according to an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
It should be noted that: references herein to "a plurality" means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., a and/or B may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in other sequences than those illustrated or otherwise described.
Fig. 1 shows a schematic front view of a lithium battery protection device according to an embodiment of the present application, fig. 2 shows a schematic side view of a lithium battery protection device according to an embodiment of the present application, in fig. 1 and 2, 1 is an explosion-proof housing, 2 is a control box, 3 is a pressure relief mechanism, 4 is a storage tank, 5 is a pipeline, 6 is a nozzle, 7 is a temperature detection mechanism, 8 and 9 are combustible gas concentration detection mechanisms, 10 is a flame-proof mechanism, and referring to fig. 1 and 2, the embodiment of the present application provides a lithium battery protection device, which at least includes a cooling mechanism, a controller, and an explosion-proof housing, and is described in detail as follows:
The cooling mechanism comprises a storage tank for storing cooling agents, a nozzle for spraying the cooling agents to the lithium battery and a pipeline for conveying the cooling agents to the nozzle, and the nozzle is installed corresponding to the position of the lithium battery.
Specifically, the cooling agent can be cooling liquid, such as non-phase change fluoride liquid, also can be phase change perfluoro hexanone, the storage tank can be arranged inside the explosion-proof shell, also can be arranged outside the explosion-proof shell, the storage capacity of the storage tank can be set according to the volume and the quantity of lithium batteries of the lithium battery pack, such as the larger the volume of the lithium batteries is, the larger the storage capacity of the storage tank is, the larger the quantity of the lithium batteries is, the larger the storage capacity of the storage tank is, it can be understood that the cooling agent sprayed out of the nozzles has certain pressure, the pressure supply mode can be that the storage tank is a pressure storage tank, also can be provided with a pressure pump on a pipeline, the nozzles are installed corresponding to the positions of the lithium batteries, the nozzles can be installed according to the positions corresponding to the numbers of the lithium batteries, so that the controller obtains the position information of the lithium batteries according to the numbers of the lithium batteries, and the installation mode of each lithium battery is that each lithium battery is correspondingly installed with one nozzle, i.e. each lithium battery is cooled through one nozzle, and also can be correspondingly installed with a plurality of adjacent lithium batteries, namely, the plurality of adjacent lithium batteries can be obliquely directed to the lithium batteries from the same nozzle through one outlet, and can be obliquely directed to the lithium battery from the bottom to the corresponding angle.
And the controller acquires lithium battery parameters from the battery management system and controls the nozzle to locally cool the lithium battery with the first thermal runaway and without the second thermal runaway.
Specifically, referring to fig. 2, the controller may be a control box, where the control box may include a control circuit board and a control system, and obtains lithium battery parameters such as temperature, voltage, current and the like of the lithium battery from the battery management system through wired connection or wireless connection, the nozzle may be controlled by an electromagnetic valve, and the electromagnetic valve is controlled by the controller, that is, the controller controls the opening and closing of the electromagnetic valve, and controls the nozzle, where a control mode of the controller on the electromagnetic valve may be remote control or near control.
And the explosion-proof shell is used for installing the lithium battery pack, the cooling mechanism and the controller.
Specifically, the explosion-proof housing can be designed based on GB/T3836, the protection level can be larger than IP66, when the lithium battery pack is installed, the lithium battery pack can be installed in the isolation housing, and then the isolation housing is installed in the explosion-proof housing, so that the lithium battery is in a closed environment with limited oxygen, the possibility of combustion and explosion can be reduced, and the reaction degree and harm of thermal runaway of the lithium battery are reduced.
In the present application, further comprising:
the pressure release mechanism is used for releasing pressure from the inside of the flameproof shell to the outside of the flameproof shell.
Optionally, the pressure release mechanism is including running through the flameproof housing in order to communicate the inside and outside pressure release pipe of flameproof housing, be equipped with the rupture disk in proper order from flameproof housing outside to flameproof housing inside on the pressure release pipe, let out burst structure and transmission separation structure, the rupture disk is used for sealing the outside export of flameproof housing of pressure release pipe, let out burst structure is used for letting out the inside exhaust pressure gas of flameproof housing, transmission separation structure gives the inside exhaust pressure gas of flameproof housing and lets out burst structure to the impurity in the separation.
Specifically, the shape of the pressure release pipe can be set according to actual needs, such as square, round or irregular hollow tubular, the shape of the rupture disk is matched with the shape of an outlet of the pressure release pipe outside the flameproof shell, the pressure release pipe is used for sealing the outlet of the pressure release pipe outside the flameproof shell, the normal sealing of the flameproof shell can be realized by the rupture disk, and the pressure gas is gas with certain pressure.
Optionally, the explosion venting structure includes:
the positioning shafts are arranged inside the pressure relief pipe and are axially distributed along the pressure relief pipe;
The corrugated net is filled between the positioning shaft and the pressure relief pipe, the inner side of the corrugated net is wound on the positioning shaft in a fixed connection mode, and the outer side of the corrugated net is fixedly connected with the pressure relief pipe.
Specifically, the positioning shaft can be arranged at the center of the pressure relief pipe, the corrugated net and the positioning shaft can be connected in a welding mode, can be connected in an adhesive mode, can be connected in a welding mode, and can be connected in an adhesive mode.
In addition, the explosion venting structure can also adopt a corrugated fire-retarding net.
Optionally, the transfer barrier structure comprises at least one septum partially enclosing the pressure relief tube.
Optionally, when the number of the spacers is greater than two, a part of the spacers close the upper part of the pressure relief pipe, and a part of the spacers close the lower part of the pressure relief pipe.
Referring to fig. 2, a partial septum closing an upper portion of the pressure relief tube and a partial septum closing a lower portion of the pressure relief tube may be spaced apart to form a tortuous gas path.
It can be understood that when the inside pressure that presets of flameproof housing reached, the burst disk was opened, high temperature gas, electrolyte and unnecessary cooling medicament, flame-proof medicament that lithium cell thermal runaway produced can be discharged through transmission separation structure and let out burst structure, from the burst disk that opens, the transmission separation structure can fully intercept the flying gas material, avoid letting out burst structure to block up, transmission separation structure and let out burst structure combined action, can carry out secondary cooling and flame-proof, in addition, can design pressure release pipe, specific structures such as length and shape of transmission separation structure and let out burst structure for from the burst disk temperature that opens less than or equal to presets temperature threshold value, such as 150 ℃, during actual design, can carry out test verification based on GB/T3836.2.
It should be noted that after the rupture disk is opened, because the cooling agent and the flame-extinguishing agent are already acting, the condition that external oxygen reversely enters the inside of the flameproof housing and the risk of explosion is increased can not occur.
In the present application, further comprising:
And the flame-extinguishing mechanism is used for extinguishing flame in the flameproof shell.
Optionally, the flame-out mechanism comprises:
the aerosol fire extinguisher is connected with the controller, and the outlet is communicated with the inside of the flameproof shell through a pipeline.
In the present application, further comprising:
The temperature detection mechanism is connected with the controller and used for detecting the temperature inside the explosion-proof shell and can make up for the defect of the detection capability of the battery management system.
Optionally, the temperature detection mechanism includes:
And the temperature sensor is arranged inside the explosion-proof shell.
Alternatively, the temperature detection mechanism may also be a temperature probe.
In the present application, further comprising:
And the combustible gas concentration detection mechanism is connected with the controller and used for detecting the concentration of the combustible gas in the explosion-proof shell.
Optionally, the combustible gas concentration detection mechanism includes:
The hydrogen sensor is used for detecting the concentration of hydrogen in the explosion-proof shell;
And the carbon monoxide sensor is used for detecting the concentration of carbon monoxide in the explosion-proof shell.
Optionally, the combustible gas concentration detection mechanism further comprises a methane sensor for detecting the methane concentration inside the flameproof housing.
In summary, the controller obtains the lithium battery parameters from the battery management system, wherein the lithium battery parameters comprise the voltage, the current and the temperature of the lithium battery, and when the lithium battery is judged to have thermal runaway according to the lithium battery parameters, the nozzle is controlled, and the cooling agent is sprayed to the lithium battery through the nozzle, so that the thermal runaway reaction of the lithium battery can be effectively delayed and inhibited, and the lithium battery can be better protected.
Fig. 3 is a flowchart of a lithium battery protection method according to an embodiment of the present application, referring to fig. 3, according to a second aspect of an embodiment of the present application, a lithium battery protection method is provided, which is applied to the above-mentioned lithium battery protection device, and includes at least steps S1 to S3, and is described in detail as follows:
in step S1, a first thermal runaway condition and a second thermal runaway condition are acquired.
Specifically, the first thermal runaway condition characterizes a condition required when a lithium battery is at risk of thermal runaway, and the second thermal runaway condition characterizes a condition required when a lithium battery is at risk of thermal runaway.
In step S2, the lithium battery parameters are obtained from the battery management system in real time, and the lithium battery parameters are obtained.
Specifically, the lithium battery parameters include lithium battery temperature, lithium battery temperature rise rate, lithium battery current, lithium battery voltage drop value and lithium battery position information, and the lithium battery position information can be obtained through the lithium battery number of the battery management system
In step S3, according to the lithium battery parameters, the first thermal runaway judgment is performed through the first thermal runaway condition, if the first thermal runaway exists, the second thermal runaway judgment is performed through the second thermal runaway condition, if the second thermal runaway does not exist, the control nozzle performs local cooling on the lithium battery with the first thermal runaway, the battery management system is informed to close the charge and discharge function of the lithium battery with the first thermal runaway and without the second thermal runaway, and if the second thermal runaway exists, the control nozzle performs overall cooling on the lithium battery pack.
Specifically, when the first thermal runaway exists in the lithium battery and the second thermal runaway does not exist, the controller controls the nozzles at corresponding positions to cool the lithium battery according to the position information of the lithium battery, namely, the nozzles are used for spraying cooling agents to the lithium battery with the first thermal runaway, the battery management system is informed to close the charge and discharge functions of the lithium battery with the first thermal runaway and the second thermal runaway, namely, the lithium battery with the first thermal runaway is powered off, when the second thermal runaway exists in the lithium battery, the controller controls all the nozzles to comprehensively cool the lithium battery pack, namely, the cooling mechanism is comprehensively started to reduce the temperature of the lithium battery without the thermal runaway, avoid thermal diffusion, reduce the temperature inside the explosion-proof shell, and reduce the risks of combustion and explosion
In the application, if the second thermal runaway exists, the flame-proof mechanism is controlled to eliminate the flame inside the flameproof housing, namely, the flame possibly existing is eliminated, and the combustion and explosion risks further occur.
Optionally, if there is a second thermal runaway, the battery management system is notified to shut down the charge and discharge functions of all lithium batteries, i.e. to power down all lithium batteries.
In the application, the first thermal runaway condition is one or more of a lithium battery temperature being greater than a first temperature threshold, a difference between the temperature of the lithium battery and the temperature of other lithium batteries being greater than a first temperature difference, a lithium battery voltage being greater than a preset voltage, a lithium battery current being greater than a preset current, and a flammable gas concentration being greater than zero.
Specifically, the first temperature threshold, the first temperature difference, the preset voltage and the preset current may be set according to parameters of the lithium battery, or may be set according to an underground coal mine environment, for example, the first temperature threshold may be 70 ℃, the first temperature difference may be 10 ℃, the preset voltage may be a voltage specified range of a lithium battery manufacturer, the preset current may be a current specified range of the lithium battery manufacturer, and the combustible gas may be carbon monoxide gas or hydrogen.
In some embodiments of the application, based on the foregoing aspects, the second thermal runaway condition is one or more of the following conditions:
The lithium battery temperature is greater than a second temperature threshold;
The voltage drop value of the lithium battery is larger than the preset voltage drop value, the temperature rise rate of the lithium battery is larger than the preset temperature rise rate, and the duration exceeds the preset duration;
the temperature of the lithium battery is greater than a first preset temperature, the rate of temperature rise of the lithium battery is greater than a preset rate of temperature rise, and the duration exceeds a preset duration;
the temperature in the flameproof housing is greater than a second temperature threshold, which is greater than the first temperature threshold.
Specifically, the second temperature threshold, the preset voltage drop value, the preset temperature rise rate, the preset duration, the first preset temperature and the second temperature threshold can be set according to parameters of the lithium battery, or can be set according to underground coal mine environments, for example, the second temperature threshold is 80 ℃, the preset voltage drop value is 25% of the initial voltage of the lithium battery, the preset temperature rise rate is 1 ℃/s, and the preset duration is 3s.
In the present application, further comprising:
detecting the concentration of the combustible gas in the explosion-proof shell through a combustible gas concentration detection mechanism;
the temperature inside the flameproof housing is detected by a temperature detection mechanism.
In the present application, further comprising:
When the pressure inside the flameproof shell is larger than the preset pressure, the pressure release mechanism releases pressure from the inside of the flameproof shell to the outside of the flameproof shell.
Because the change of the concentration of the combustible gas has good fault indication performance of the lithium battery, if the directed battery fault is not treated, the fault is likely to develop into thermal runaway, so that the detection results of the temperature detection mechanism and the concentration detection mechanism of the combustible gas can be used for verifying the lithium battery parameters of the battery management system, the redundancy of the protection judging function is realized, and the protection reliability is improved.
According to the embodiment of the application, on one hand, when the thermal runaway risk exists in the lithium battery, the positioning spraying of the cooling agent is carried out on the lithium battery with the thermal runaway risk according to the position information of the lithium battery, the temperature is reduced in a targeted manner in the initial stage of the thermal runaway development, the development of the thermal runaway and the thermal diffusion are delayed and restrained, when the thermal runaway phenomenon occurs in the lithium battery, the whole spraying of the cooling agent is carried out on the lithium battery pack, the flame inside the explosion-proof shell is eliminated through the flame-extinguishing mechanism, when the thermal runaway development is to the explosion risk, the combined cooling and flame-extinguishing actions can avoid the combustion or explosion inside the lithium battery as far as possible, meanwhile, the whole lithium battery is prevented from generating an ignition source to the outside, when the internal pressure of the explosion-proof shell is higher than the preset pressure, the pressure release mechanism can release the pressure gas generated in the lithium battery from the inside the explosion-proof shell due to the thermal runaway of the lithium battery, the cooling flame-extinguishing function is also provided in the release process, the whole power supply is prevented from generating an ignition source such as a high temperature surface, the flame and the high temperature gas in the whole as a second path measure, the flame-extinguishing mechanism and the high temperature gas in the explosion source are eliminated, when the thermal runaway development is till the explosion risk exists, the explosion reaction of the lithium battery is prevented from being generated in the underground, the explosion reaction can be further reduced, and the explosion reaction can be caused in the explosion environment is prevented from the most dangerous condition is basically, and the explosion is prevented from the explosion environment is caused.
On the other hand, through the data interaction of controller and battery management system, realize early discovery and early the handling of lithium cell thermal runaway, can have the lithium cell of thermal runaway risk to carry out the pertinence action, promote the protection effect, perfect the outage foundation behind the battery thermal runaway in the aspect of the battery management system, help reducing thermal runaway follow-up harm.
In the above embodiments, the lithium battery may be understood as a lithium battery power supply.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
The above description is only an example of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A lithium battery protection device, comprising:
The cooling mechanism comprises a storage tank for storing cooling agents, a nozzle for spraying the cooling agents to the lithium battery and a pipeline for conveying the cooling agents to the nozzle, and the nozzle is installed corresponding to the position of the lithium battery;
The controller is used for acquiring lithium battery parameters from the battery management system and controlling the nozzle to locally cool the lithium battery with the first thermal runaway and without the second thermal runaway;
And the explosion-proof shell is used for installing the lithium battery pack, the cooling mechanism and the controller.
2. The lithium battery protection device according to claim 1, further comprising:
the pressure release mechanism is used for releasing pressure from the inside of the flameproof shell to the outside of the flameproof shell.
3. The lithium battery protection device according to claim 2, wherein the pressure release mechanism comprises a pressure release pipe penetrating through the explosion-proof housing to communicate the inside and the outside of the explosion-proof housing, a rupture disc, a explosion release structure and a transmission blocking structure are sequentially arranged on the pressure release pipe from the outside of the explosion-proof housing to the inside of the explosion-proof housing, the rupture disc is used for sealing an outlet of the pressure release pipe, which is positioned outside the explosion-proof housing, the explosion release structure is used for releasing pressure gas exhausted from the inside of the explosion-proof housing, and the transmission blocking structure transmits the pressure gas exhausted from the inside of the explosion-proof housing to the explosion release structure and blocks impurities therein.
4. A lithium battery protection device according to claim 3, wherein the explosion venting structure comprises:
the positioning shafts are arranged inside the pressure relief pipe and are axially distributed along the pressure relief pipe;
The corrugated net is filled between the positioning shaft and the pressure relief pipe, the inner side of the corrugated net is wound on the positioning shaft in a fixed connection mode, and the outer side of the corrugated net is fixedly connected with the pressure relief pipe.
5. A lithium battery protection arrangement according to claim 3, wherein the transfer barrier structure comprises at least one spacer partially enclosing a pressure relief tube.
6. The lithium battery protection device according to claim 5, wherein when the number of the spacers is greater than two, a part of the spacers close an upper portion of the pressure release pipe and a part of the spacers close a lower portion of the pressure release pipe.
7. The lithium battery protection device according to claim 1, further comprising:
And the flame-extinguishing mechanism is used for extinguishing flame in the flameproof shell.
8. The lithium battery protection device of claim 7, wherein the flame trap mechanism comprises:
the aerosol fire extinguisher is connected with the controller, and the outlet is communicated with the inside of the flameproof shell through a pipeline.
9. The lithium battery protection device according to claim 1, further comprising:
And the temperature detection mechanism is connected with the controller and used for detecting the temperature inside the explosion-proof shell.
10. The lithium battery protection device according to claim 1, further comprising:
And the combustible gas concentration detection mechanism is connected with the controller and used for detecting the concentration of the combustible gas in the explosion-proof shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322703551.1U CN220984629U (en) | 2023-10-09 | 2023-10-09 | Lithium battery protection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322703551.1U CN220984629U (en) | 2023-10-09 | 2023-10-09 | Lithium battery protection device |
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| CN220984629U true CN220984629U (en) | 2024-05-17 |
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| CN202322703551.1U Active CN220984629U (en) | 2023-10-09 | 2023-10-09 | Lithium battery protection device |
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| CN (1) | CN220984629U (en) |
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