CN112002860B - Explosion-proof battery - Google Patents
Explosion-proof battery Download PDFInfo
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- CN112002860B CN112002860B CN202010677922.1A CN202010677922A CN112002860B CN 112002860 B CN112002860 B CN 112002860B CN 202010677922 A CN202010677922 A CN 202010677922A CN 112002860 B CN112002860 B CN 112002860B
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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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- 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
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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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
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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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
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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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
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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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
- H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
- H01M10/6572—Peltier elements or thermoelectric devices
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The application proposes an explosion-proof battery, include: the battery module is arranged in the first box body and comprises an electrode and a pressure relief valve; the temperature adjusting device is arranged corresponding to the battery module and is used for performing heat exchange with the battery module so as to reduce the temperature of the battery module; a power control module arranged in the second box body; the first pressure relief device is arranged between the first box body and the second box body and is used for relieving the pressure in the first box body to the second box body; the second pressure relief device is arranged on the side wall of the second box body and used for relieving the pressure in the second box body to the outside so as to realize explosion-proof protection of the battery module.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an explosion-proof battery.
Background
As the requirements of various electronic and electrical devices used in explosive mixture environments on storage battery capacity become larger and smaller, the current industrial production tends to select and use lithium ion batteries with higher energy density. However, the higher the battery energy density, the more factors that affect the safety of its use, and therefore, the more stringent the protection against explosion is required for lithium ion batteries used in an explosive mixture environment.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
Therefore, the invention provides an explosion-proof battery for realizing temperature regulation of a battery module so as to realize explosion-proof protection.
To achieve the above object, the present invention provides an explosion-proof battery comprising: a first case and a second case; the battery module is arranged in the first box body, wherein the battery module comprises a first area and a second area, the first area comprises all electrodes in the battery module, and the second area comprises all pressure relief valves in the battery module; the first sealing layer is used for covering the first area, the second sealing layer is used for covering the second area, the impact strength of the second sealing layer is smaller than that of the pressure release valve when the pressure release valve is opened, the second sealing layer also covers the first area, and the impact strength of the second sealing layer is smaller than that of the first sealing layer; a third encapsulant layer covering the second encapsulant layer, wherein the third encapsulant layer has a second opening at the pressure relief valve position, the second opening corresponding to the pressure relief valve such that the pressure relief valve can vent through the second opening, the third encapsulant layer has an impact strength greater than that of the first encapsulant layer, and the first, second and third encapsulant layers are silica gel or epoxy resin; a first support member disposed in the first case for supporting and fixing the battery module; the second supporting piece is arranged in the second box body and is used for supporting and fixing the power supply control module; the temperature adjusting device is arranged corresponding to the battery module and is used for performing heat exchange with the battery module so as to reduce the temperature of the battery module; the power supply control module is arranged in the second box body; a first pressure sensor disposed in the first housing; the first pressure relief device is arranged between the first box body and the second box body and is used for relieving the pressure in the first box body to the second box body; a second pressure sensor disposed in the second tank, the second pressure sensor having a pressure threshold value that is less than a pressure threshold value of the first pressure sensor; the second pressure relief device is arranged on the side wall of the second box body and used for relieving the pressure in the second box body to the outside.
In some embodiments, the temperature regulating device further comprises: at least one temperature sensor for detecting a current temperature of the battery module; the cooling loop is arranged corresponding to the battery module; and the control unit is respectively connected with the at least one temperature sensor and the cooling loop so as to control the cooling loop according to the temperature detected by the temperature sensor.
In some embodiments, the cooling circuit includes a semiconductor refrigeration piece and a radiator, the cold end of the semiconductor refrigeration piece is attached to the first box, the hot end of the semiconductor refrigeration piece is attached to the radiator, and the semiconductor refrigeration piece is disposed on the outer side of the first box.
In some embodiments, the control unit is configured to control the semiconductor refrigeration sheet to be turned on when the temperature reaches a first preset temperature, and control the rotation speed of the heat sink according to the temperature of the battery module.
In some embodiments, the cooling circuit includes a water cooling circuit and a radiator, a first heat exchange area of the water cooling circuit is disposed in the first box, a second heat exchange area is disposed outside the first box, the first heat exchange area and the second heat exchange area form a refrigerant circulation circuit, and the radiator is used for radiating heat from the second heat exchange area.
In some embodiments, the water cooling circuit is provided with a regulating valve body connected with the control unit, and the control unit is used for controlling the opening degree of the regulating valve body according to the temperature of the battery module and controlling the rotating speed of the radiator according to the temperature of the battery module.
In some embodiments, the explosion-proof battery further comprises: the pouring structure comprises a first pouring layer and a second pouring layer, the first pouring layer is used for covering the first area, the second pouring layer is used for covering the second area, and the impact strength of the second pouring layer is smaller than that of the pressure release valve when the pressure release valve is opened, so that the second pouring layer is broken when the pressure release valve is opened; the second encapsulant layer also covers the first region, and the impact strength of the second encapsulant layer is less than the impact strength of the first encapsulant layer.
In some embodiments, a third encapsulant layer covering the second encapsulant layer, wherein the third encapsulant layer has a second opening at the relief valve location, the second opening corresponding to the relief valve such that the relief valve can vent through the second opening, the third encapsulant layer having an impact strength greater than an impact strength of the first encapsulant layer, the first, second and third encapsulant layers being a silicone or epoxy.
In some embodiments, the first and/or second tank is an explosion-proof tank comprising: a case body; and the explosion-proof cover is arranged on the box body and is connected with the box body through bolts.
In some embodiments, the battery module and the power control module are electrically connected through a first lead device between the first box and the second box; and a second lead device is arranged on the second box body so that the power supply control module is electrically connected with an external circuit.
This application is through setting up pressure relief device respectively between first box and second box and on the second box, forms the second grade and releases to through releasing the pressure that effectively reduces battery module gas discharge produced step by step when the trouble such as thermal runaway leads to the relief valve to open in the battery, prevent to destroy the casing of last level, thereby avoid taking place the explosion extreme harm. Meanwhile, the temperature of the explosion-proof battery is regulated through the temperature regulating device, so that faults such as thermal runaway and the like of the battery module are effectively prevented.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural view of an explosion-proof battery according to a first embodiment of the present invention;
fig. 2 is a schematic structural view of an explosion-proof battery according to a second embodiment of the present invention;
fig. 3 is a schematic structural view of an explosion-proof battery according to a third embodiment of the present invention;
fig. 4 is a schematic structural view of an explosion-proof battery according to a fourth embodiment of the present invention;
fig. 5 is a schematic structural view of an explosion-proof battery according to a fifth embodiment of the present invention;
reference numerals:
an explosion-proof battery 1, a box body 101 and an explosion-proof cover 102;
the first case 10, the first potting layer 11, the second potting layer 12, the third potting layer 13, the battery module 30, the electrode 31, the pressure release valve 32, the first support 33, the first pressure sensor 71;
the second box 20, the first lead device 21, the second lead device 22, the power control module 40, the second supporting piece 41, the first pressure relief device 50, the second pressure relief device 60 and the second pressure sensor 72;
a semiconductor cooling fin 81, a radiator 82, and a water cooling circuit 83.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
An explosion-proof battery according to an embodiment of the present invention is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of an explosion-proof battery according to a first embodiment of the present invention. As shown in fig. 1, an explosion-proof battery 100 in an embodiment of the present invention includes: the battery pack comprises a first box 10, a second box 20, a battery module 30, a power control module 40, a first pressure relief device 50, a second pressure relief device 60 and a temperature regulating device.
The battery module 30 is disposed in the first case 10, and the battery module 30 includes a first area including all the electrodes 31 in the battery module and a second area including all the pressure relief valves 32 in the battery module.
It should be understood that the battery module 30 may be formed by connecting lithium cells in series or parallel, where any lithium cell has positive and negative electrodes 31, when N lithium cells are disposed in the battery module 30, n×2 electrodes 31 are provided, N is an integer greater than 1, and where the first area includes all the electrodes 31 in the battery module 30. Similarly, the second region includes all of the relief valves 32 in the battery module 30.
It should be noted that, battery explosion generally means that a lithium battery has a failure such as thermal runaway, so that the internal pressure of the battery increases sharply until the explosion occurs by breaking the casing covering the battery. Therefore, the pressure release valve is usually arranged on the high-capacity lithium battery, so that when the gas pressure in the battery reaches the preset threshold value of the pressure release valve, the gas in the battery can be released to the outside of the battery by opening the pressure release valve, and the explosion of the battery is effectively avoided.
The temperature adjusting device is arranged corresponding to the battery module 30 and is used for performing heat exchange with the battery module 30 so as to reduce the temperature of the battery module 30.
It should be noted that, the temperature adjusting device may be disposed at a position corresponding to the battery module 30 outside the first case 10 according to the difference of the heat exchange refrigerant, or may be disposed inside the first case 10, so as to perform heat exchange with the battery module 30 through contact with the battery module 30, thereby adjusting the temperature of the battery module through the temperature adjusting device, so that the temperature of the battery module maintains an optimal charge and discharge state, and a fault caused by thermal runaway is avoided.
The power control module 40 is disposed in the second housing.
It should be noted that, the power control module 40 is electrically connected to the battery module 30, and the battery control module 40 is used for controlling and monitoring the charge and discharge states of the battery module 30.
Specifically, as shown in fig. 2, the battery module 30 and the power control module 40 are electrically connected between the first casing 10 and the second casing 20 through the first lead device 21. For example, an electric control wire between the power control module 40 and the battery module 30 passes through the housing between the first casing 10 and the second casing 20 through the first lead device 21.
It should be understood that the second case 20 may further be provided with a second lead device 22 in communication with the outside, so as to electrically connect the power control module 40 with an external circuit, where the external circuit may be a control circuit of the electric device, so that the power control module 40 can control the charging and discharging of the battery module 30 according to the electric demand.
Wherein the first lead means 21 and the second lead means 22 may consist of one or more glans heads.
The first pressure relief device 50 is provided between the first casing 10 and the second casing 20 for relieving the pressure in the first casing 10 to the second casing 20.
The second pressure relief device 60 is disposed on a sidewall of the second casing 20, and is used for relieving the pressure in the second casing 20 to the outside.
Further, since the battery module 30 writes the gas generated inside the battery module 30 to the outside of the battery module 30 through the pressure release valve 32, however, since the first casing 10 is of a sealed structure, the gas pressure in the first casing 10 is gradually increased as the gas of the battery module 30 is continuously increased, with an explosion risk. Therefore, the first pressure relief device 50 is further disposed between the first tank 10 and the second tank 20, so that the pressure in the first tank 10 can be relieved to the second tank 20, and the risk of explosion of the first tank 10 is effectively reduced. Meanwhile, the buffer space formed by the second box body 20 effectively reduces the pressure of the gas to be discharged and reduces the danger of explosion of the whole explosion-proof battery.
Further, the second pressure relief device 60 is further arranged on the side wall of the second box 20, so that gas generated by the battery module 30 can be finally discharged to the outside of the explosion-proof battery 100 through the second pressure relief device 60, namely, the gas generated by the battery module 30 is sequentially discharged to the outside of the explosion-proof battery through the pressure relief valve 32, the first pressure relief device 50 and the second pressure relief device 60, and explosion of the explosion-proof battery is effectively prevented.
From this, this application is through setting up pressure release device respectively between first box and second box and on the second box, forms the second grade and releases to through the casing of effectively reducing battery module 30 gaseous exhaust pressure destruction last level of releasing step by step, can not cause explosive extreme harm to external environment more. Meanwhile, the temperature of the explosion-proof battery is regulated through the temperature regulating device, so that faults such as thermal runaway and the like of the battery module are effectively prevented.
Further, in embodiments of the present application, the first pressure relief device 50 and the second pressure relief device 60 may be a valve stack comprised of one or more one-way valves and/or flame arrestors.
In some embodiments, as shown in fig. 3, the explosion-proof battery 100 further includes a first potting layer 11 and a second potting layer 12.
The first molding layer 11 is used for covering a first area of the battery module 30, and the second molding layer 12 covers at least a second area of the battery module 30, wherein the impact strength of the second molding layer 12 is smaller than that of the pressure release valve when the pressure release valve is opened, so that the pressure release valve 32 breaks the second molding layer when the pressure release valve is opened.
It should be noted that, since the potential ignition source in the battery is a charged component, that is, the electrode 31 in the battery module 30, the application covers the first area of the battery module 30 through the first potting layer 11, that is, the electrode 31 in the battery module 30 is isolated from the gas outside the battery module 30 through the first potting layer 11, so that the electrode 31 in the battery module 30 is effectively prevented from generating an electric spark to ignite the explosive gas in the surrounding environment, thereby causing an explosive dangerous accident.
Further, the application protects the pressure release valve 32 through the second sealing layer 12 to prevent the pressure release valve 32 from being broken by force from the outside of the battery module 30, thereby influencing the pressure environment inside the battery module 30, causing battery explosion and effectively improving the reliability of the battery module.
Meanwhile, the second sealing layer 12 and the pressure release valve 32 can be broken by the gas generated inside the battery module 30, that is, the second sealing layer 12 and the pressure release valve 32 can be broken when the pressure inside the battery module 30 increases sharply, so as to release the gas inside the battery module 30 to the outside of the battery module 30, and avoid the continuous increase of the gas inside the battery module 30 and the explosion.
It should be appreciated that the first potting layer 11 has a first opening corresponding to the pressure relief valve 32 so that the pressure relief valve 32 can vent through the first opening.
Alternatively, in order to further isolate the electrode 31 in the battery module 30, the second molding layer 12 may be made to cover the first region.
The impact strength of the second molding layer 12 is smaller than that of the first molding layer 11, so that the second molding layer 12 can be easily broken by the gas inside the battery module 30, thereby achieving the purpose of gas release.
The explosion-proof battery 100 further comprises a third potting layer 13, wherein the third potting layer 13 covers the second potting layer 12.
The third sealing layer 13 has a second opening at the pressure release valve 32, where the second opening corresponds to the pressure release valve 32, so that the pressure release valve 32 can exhaust through the second opening, the impact strength of the third sealing layer 13 is greater than that of the first sealing layer 11, and the first sealing layer 11, the second sealing layer 12 and the third sealing layer 13 are made of silica gel or epoxy resin.
That is, the third sealing layer 13 is arranged on the outer side of the second sealing layer 12, so that the damage degree to the second sealing layer 12 can be effectively limited when the pressure release valve 32 is opened, namely, the damage part can be limited to the pressure release valve to the greatest extent, the damage influence to the first sealing layer 11 is effectively reduced, and the reliability of sealing protection is improved. Moreover, the manufacturing process of the casting layer can be simplified by adopting silica gel or epoxy resin, and the better casting protection effect can be ensured, so that the method has better practicability and adaptability.
Further, the first, second and third potting layers 11, 12 and 13 fill up the space between the battery module 30 and the side wall and bottom of the first case 10 so as to closely attach and fix the battery module 30 to the explosion-proof case body, preventing the battery module from collision when the explosion-proof battery 1 is moved, causing unnecessary reactions inside the battery module 30.
Further, the explosion-proof battery 100 further includes a first pressure sensor 71 and a second pressure sensor 72.
Wherein the first pressure sensor 71 is disposed in the first casing 10, the second pressure sensor 72 is disposed in the second casing 30, and the pressure threshold of the second pressure sensor 72 is smaller than the pressure threshold of the first pressure sensor 71.
Specifically, since the pressure threshold of the second pressure sensor 72 is smaller than the pressure threshold of the first pressure sensor 71, gas enters the second tank 20 through the first pressure relief device 50, and the pressure after buffer decompression of the second tank 20 can still reach the pressure threshold for triggering the second pressure sensor 72, so that the accuracy of pressure detection is improved, the power supply control module can timely cut off the connection between the explosion-proof battery and an external circuit when the pressure in the tank rises, and timely relieve the pressure in the tank, so that the explosion hidden trouble of the explosion-proof battery is reduced to the greatest extent.
In some embodiments, as shown in fig. 3, the first tank 10 and/or the second tank 20 are explosion-proof tanks, which include: a case body 101 and an explosion-proof cover 102.
Wherein, explosion-proof cover 102 sets up on box body 101, and explosion-proof cover 102 passes through the bolt and links to each other with box body 101 to in time change and maintain battery module 30, practice thrift manufacturing cost.
Further, a free space 14 exists between the potting layer covering the battery module 30 and the explosion-proof cover to provide a buffer area for the generated gas after the pressure release valve 32 is opened, so as to avoid explosion accidents and the like of the explosion-proof box.
Further, the explosion-proof battery 1 further includes a first support 33 provided in the first casing 10 for supporting and fixing the battery module 30, a second support 41 provided in the second casing 20, and the second support 41 for supporting and fixing the power control module 40.
Specifically, the temperature adjustment device further includes: at least one temperature sensor, a cooling circuit and a control unit.
Wherein, the temperature sensor can be arranged in the first box 10 for detecting the current temperature of the battery module 30; the cooling circuit is disposed corresponding to the battery module to perform heat exchange with the battery module 30, thereby realizing cooling of the battery module 30, and the control unit is connected with at least one temperature sensor and the cooling circuit, respectively, to control the cooling circuit according to the temperature detected by the temperature sensor.
As one possible embodiment, as shown in fig. 4, the cooling circuit includes a semiconductor cooling fin 81 and a heat sink 82.
The cold end of the semiconductor cooling plate 81 is attached to the first case 10, the hot end of the semiconductor cooling plate 81 is attached to the radiator 82, and the semiconductor cooling plate 81 is disposed outside the first case 10.
It should be noted that, the semiconductor refrigeration sheet 81 includes a cold end and a hot end, the cold end is used for absorbing heat and releasing cold energy, the hot end is used for releasing heat, the temperature difference between the cold end and the hot end is maintained according to the electrical characteristics of the semiconductor refrigeration sheet 81 after the semiconductor refrigeration sheet is electrified, and when the temperature difference between the cold end and the hot end is insufficient to meet the heat exchange requirement, the heat dissipation of the hot end is assisted by the radiator, so that the refrigerating capacity of the cold end is improved.
Further, the control unit (not shown) is used for controlling the semiconductor refrigeration piece 81 to be turned on when the temperature reaches a first preset temperature, that is, controlling the semiconductor refrigeration piece 81 to be electrified, so that the semiconductor refrigeration piece 81 utilizes the electrical characteristics of the semiconductor refrigeration piece to cool the battery module.
It should be understood that, in the process of cooling the battery module 30 by using the electrical characteristics of the semiconductor cooling plate 81 after the control unit controls the opening of the semiconductor cooling plate 81, the current flowing through the semiconductor cooling plate 81 can be further controlled according to the temperature detected by the temperature sensor, so as to adjust the cooling capacity of the semiconductor cooling plate 81, so that the cooling capacity of the semiconductor cooling plate 81 meets the cooling requirement of the battery module 30.
Further, as the battery module 30 is continuously used, the temperature of the battery module 30 is continuously increased, or the semiconductor cooling sheets 81 disposed only outside the first case 10 cannot meet the cooling requirement of the plurality of battery modules 30 due to the large number of battery modules in the first case 10. Therefore, the control unit is further configured to control the rotation speed of the radiator 82 according to the temperature of the battery module 30, so as to increase the heat dissipation capacity of the hot end of the semiconductor cooling fin 81 through the radiator 82, thereby increasing the cooling capacity of the cold end of the semiconductor cooling fin 82, and further accelerating the temperature reduction of the battery module 30.
As another possible embodiment, as shown in fig. 5, the cooling circuit includes a water cooling circuit 83 and a radiator 82.
The first heat exchange area of the water cooling circuit 83 is disposed in the first box 10, the second heat exchange area is disposed outside the first box, the first heat exchange area and the second heat exchange area form a refrigerant circulation circuit, and the radiator 82 is used for radiating heat from the second heat exchange area.
It should be understood that the first heat exchange area is provided with a hollow area (not shown), and the hollow area corresponds to the pressure release valve 32 of the battery module 30, so that the gas released when the battery module 30 releases pressure through the pressure release valve 32 can smoothly pass through the water cooling loop 83, and the pressure cannot be released due to the water cooling loop arranged above the battery module 30.
It should be noted that, in the embodiment, the refrigerant in the water cooling circuit 83 is also a liquid refrigerant, and the first heat exchange area and the second heat exchange area form a refrigerant circulation circuit, that is, the liquid refrigerant absorbs heat in the first heat exchange area to release cold energy so as to cool the battery module 30, and when the liquid refrigerant flows to the second heat exchange area, the heat of the refrigerant in the second heat exchange area is dissipated and cooled by the radiator so that the refrigerant flows to the first heat exchange area again to absorb heat.
Wherein, in order to increase the heat transfer area to the battery module 30, can set up first heat transfer district in the inside of first box 10 to in the first box 10 of coverage all battery module 30, improve the cooling effect, prevent to keep away from temperature regulating device's battery module 30 because of the untimely thermal runaway that causes of heat dissipation.
Further, in order to further increase the heat exchange amount, a first heat exchange area may be also provided outside the first case 10, so as to increase the heat exchange amount, and further ensure the reliability of the temperature of the battery module 30.
The water cooling loop is further provided with a regulating valve body connected with a control unit, the control unit is used for controlling the opening of the regulating valve body according to the temperature of the battery module 30 so as to control the flow of the refrigerant between the first heat exchange area and the second heat exchange area, when the temperature of the battery module is lower, the opening of the regulating valve body can be controlled to be kept smaller, and along with the increase of the temperature of the battery module 30, the opening of the regulating valve body can be gradually increased so as to improve the heat exchange amount in the water cooling loop.
Similarly, the control unit may also be configured to control the rotation speed of the radiator 82 according to the temperature control of the battery module 30, for example, to control the rotation speed of the radiator 82 to be smaller when the temperature of the battery module 30 is lower, so as to save energy, and to control the rotation speed of the radiator 82 to be gradually increased as the temperature of the battery module 30 increases, so as to ensure the temperature of the battery module 30 to be reduced by reducing the temperature of the coolant in the water cooling circuit.
To sum up, this application can cover battery module's electrode through first watering layer and second watering layer, effectively realizes the isolation to the electrode, avoids battery module electrode and ambient gas to produce the electric spark and takes place to ignite explosive gas around, simultaneously, this application is through setting up pressure release device respectively between first box and second box and on the second box, forms the second grade and releases to through effectively reducing battery module 30 gaseous exhaust pressure and destroy the casing of last level step by step, can not cause explosive extreme harm to external environment yet. Meanwhile, the temperature of the explosion-proof battery is regulated through the temperature regulating device, so that faults such as thermal runaway and the like of the battery module are effectively prevented.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Claims (8)
1. An explosion-proof battery, comprising:
a first case and a second case;
the battery module is arranged in the first box body, wherein the battery module comprises a first area and a second area, the first area comprises all electrodes in the battery module, and the second area comprises all pressure relief valves in the battery module;
the first sealing layer is used for covering the first area, the second sealing layer is used for covering the second area, the impact strength of the second sealing layer is smaller than that of the pressure release valve when the pressure release valve is opened, the second sealing layer also covers the first area, and the impact strength of the second sealing layer is smaller than that of the first sealing layer;
a third encapsulant layer covering the second encapsulant layer, wherein the third encapsulant layer has a second opening at the pressure relief valve position, the second opening corresponding to the pressure relief valve such that the pressure relief valve can vent through the second opening, the third encapsulant layer has an impact strength greater than that of the first encapsulant layer, and the first, second and third encapsulant layers are silica gel or epoxy resin;
a first support member disposed in the first case for supporting and fixing the battery module;
the second supporting piece is arranged in the second box body and is used for supporting and fixing the power supply control module;
the temperature adjusting device is arranged corresponding to the battery module and is used for performing heat exchange with the battery module so as to reduce the temperature of the battery module;
the power supply control module is arranged in the second box body;
a first pressure sensor disposed in the first housing;
the first pressure relief device is arranged between the first box body and the second box body and is used for relieving the pressure in the first box body to the second box body;
a second pressure sensor disposed in the second housing;
the second pressure relief device is arranged on the side wall of the second box body and used for relieving the pressure in the second box body to the outside.
2. The explosion-proof battery according to claim 1, wherein the temperature adjusting means further comprises:
at least one temperature sensor for detecting a current temperature of the battery module;
the cooling loop is arranged corresponding to the battery module;
and the control unit is respectively connected with the at least one temperature sensor and the cooling loop so as to control the cooling loop according to the temperature detected by the temperature sensor.
3. The explosion-proof battery according to claim 2, wherein the cooling circuit comprises a semiconductor cooling fin and a heat sink,
the cold end of the semiconductor refrigerating sheet is attached to the first box body, the hot end of the semiconductor refrigerating sheet is attached to the radiator, and the semiconductor refrigerating sheet is arranged on the outer side of the first box body.
4. An explosion-proof battery as set forth in claim 3, wherein said control unit is configured to control the opening of said semiconductor cooling fin when said temperature reaches a first preset temperature, and to control the rotation speed of said heat sink according to said temperature of said battery module.
5. The explosion-proof battery as set forth in claim 1, wherein,
the cooling circuit comprises a water cooling circuit and a radiator,
the first heat exchange area of the water cooling loop is arranged in the first box body, the second heat exchange area is arranged outside the first box body, the first heat exchange area and the second heat exchange area form a refrigerant circulation loop, and the radiator is used for radiating heat of the second heat exchange area.
6. The explosion-proof battery according to claim 5, wherein the water cooling circuit is provided with a regulating valve body connected to a control unit for controlling an opening degree of the regulating valve body according to the temperature of the battery module and controlling a rotation speed of the radiator according to the temperature of the battery module.
7. The explosion-proof battery of claim 1, wherein the first and/or second case is an explosion-proof case comprising:
a case body;
and the explosion-proof cover is arranged on the box body and is connected with the box body through bolts.
8. The explosion-proof battery as set forth in claim 1, further comprising:
the battery module is electrically connected with the power control module through a first lead device between the first box body and the second box body;
and a second lead device is arranged on the second box body so that the power supply control module is electrically connected with an external circuit.
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| CN202010677922.1A CN112002860B (en) | 2020-07-14 | 2020-07-14 | Explosion-proof battery |
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| CN202010677922.1A CN112002860B (en) | 2020-07-14 | 2020-07-14 | Explosion-proof battery |
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| CN112002860B true CN112002860B (en) | 2023-07-11 |
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