CN114374020A - Battery pack and vehicle with same - Google Patents

Battery pack and vehicle with same Download PDF

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Publication number
CN114374020A
CN114374020A CN202111663775.3A CN202111663775A CN114374020A CN 114374020 A CN114374020 A CN 114374020A CN 202111663775 A CN202111663775 A CN 202111663775A CN 114374020 A CN114374020 A CN 114374020A
Authority
CN
China
Prior art keywords
liquid
cooling
bottom plate
battery
cooling pipe
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111663775.3A
Other languages
Chinese (zh)
Inventor
张新宾
张占江
符运喜
吕宁
赵豪儒
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FAW Group Corp
Original Assignee
FAW Group Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FAW Group Corp filed Critical FAW Group Corp
Priority to CN202111663775.3A priority Critical patent/CN114374020A/en
Publication of CN114374020A publication Critical patent/CN114374020A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/613Cooling or keeping cold
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/62Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625Vehicles
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/63Control systems
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/653Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/655Solid structures for heat exchange or heat conduction
    • H01M10/6556Solid parts with flow channel passages or pipes for heat exchange
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567Liquids
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/244Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention discloses a battery pack and a vehicle with the same.A box body of the battery pack comprises a box body frame and a box body bottom plate, and an accommodating cavity is defined by the box body frame and the box body bottom plate; the battery part is arranged in the accommodating cavity and is a single battery cell or a battery module comprising a plurality of battery cells; the battery pack is bonded on the inner surface of the bottom plate of the box body through heat-conducting structural adhesive to realize heat-conducting connection; the liquid inlet assembly and the liquid outlet assembly are arranged in the accommodating cavity; the cooling flow channel is arranged on a bottom plate of the box body, the cooling flow channel is provided with a bottom plate liquid inlet and a bottom plate liquid outlet, the bottom plate liquid inlet is communicated with the liquid inlet assembly, the bottom plate liquid outlet is communicated with the liquid outlet assembly, the liquid inlet assembly and the liquid outlet assembly are communicated with the outside of the box body, and cooling media dissipate heat of the battery part through the liquid inlet assembly, the cooling flow channel and the liquid outlet assembly; the liquid-proof vent valves are arranged in the accommodating cavity and are communicated with the cooling flow channel; the battery pack provided by the invention can be disassembled in a nondestructive way, and the thermal runaway control is actively carried out when the thermal runaway occurs.

Description

Battery pack and vehicle with same
Technical Field
The invention relates to the technical field of batteries of electric vehicles, in particular to a battery pack and a vehicle with the same.
Background
With the increasing global energy crisis and the environmental pollution problem, the electric vehicle is rapidly developed, and the electric vehicle takes electric power as a power source and can save a large amount of fossil fuel by replacing a fuel engine with an electric motor. With the rapid development of electric vehicles, the performance requirements on power batteries are higher and higher, wherein the improvement of energy density is a common pursuit target of various host factories and battery suppliers, an effective way for improving energy density is to improve the integration level of a battery pack system, and the use of adhesion instead of screwing is an effective means for improving the integration level.
Because energy density's improvement, the probability that the battery takes place thermal runaway also improves, and when sticky technique improved the system integration degree, because sticky characteristic's reason, after the bonding is firm, the dismountability is not high, to sticky technique at present, the mode of disassembling mainly for destructive disassembling, this kind of mode is very unfriendly to the echelon utilization, above problem is waited for promptly solving.
Disclosure of Invention
The present invention is directed to a battery pack and a vehicle having the same to solve the problems of the related art.
In order to achieve the purpose, the invention provides the following technical scheme: a battery pack, comprising:
the box body comprises a box body frame and a box body bottom plate, and an accommodating cavity is defined by the box body frame and the box body bottom plate;
the battery part is arranged in the accommodating cavity and is a single battery cell or a battery module comprising a plurality of battery cells;
the battery pack is bonded on the inner surface of the box body bottom plate through the heat-conducting structural adhesive so as to realize heat-conducting connection;
the liquid inlet assembly and the liquid outlet assembly are arranged in the accommodating cavity;
the cooling flow channel is arranged on a bottom plate of the box body and provided with a bottom plate liquid inlet and a bottom plate liquid outlet, the bottom plate liquid inlet is communicated with the liquid inlet assembly, the bottom plate liquid outlet is communicated with the liquid outlet assembly, the liquid inlet assembly and the liquid outlet assembly are communicated with the outside of the box body, and cooling media dissipate heat of the battery part through the liquid inlet assembly, the cooling flow channel and the liquid outlet assembly;
and the liquid-proof ventilation valves are arranged in the accommodating cavity and communicated with the cooling flow channel.
Further, the box frame includes the long frame that the interval set up and the wide frame that the interval set up, wherein, wide frame includes preceding wide frame and back broad frame, hold the chamber by the long frame with the broad frame and the box bottom plate enclose to establish and form, preceding broad frame is provided with the cooling tube via hole, battery portion with long frame and broad frame interval set up.
Furthermore, the liquid inlet assembly comprises a first cooling pipe, a second cooling pipe and a liquid storage tank, the first cooling pipe is respectively communicated with the liquid inlet of the bottom plate, the second cooling pipe and the liquid storage tank, the second cooling pipe penetrates through the cooling pipe through hole to be communicated with the outside, an external cooling medium flows in through the second cooling pipe, and the second cooling pipe is a one-way pipe; the liquid storage tank comprises an electromagnetic valve, and the electromagnetic valve can be controlled to release or stop liquid in the liquid storage tank.
Further, the liquid outlet assembly comprises a third cooling pipe, a fourth cooling pipe, a fifth cooling pipe and a liquid outlet three-way valve, one end of the third cooling pipe, one end of the fourth cooling pipe and one end of the fifth cooling pipe are respectively communicated with the liquid outlet three-way valve, the other end of the third cooling pipe is communicated with the liquid outlet of the bottom plate, the other end of the fourth cooling pipe penetrates through the cooling pipe through hole to be communicated with the outside, and the other end of the fifth cooling pipe is communicated with the inside of the accommodating cavity.
Further, still include:
the battery controller sends an action instruction to the electromagnetic valve;
the temperature detection module is used for detecting the temperature of the battery part, the temperature of the battery part reaches a threshold value, the temperature detection module outputs a protection signal to the battery controller, the protection signal indicates the battery controller to send a protection action instruction to the electromagnetic valve, the protection action instruction is used for indicating the electromagnetic valve to execute a protection action, and the protection action is used for indicating the electromagnetic valve to open the liquid storage tank and release liquid in the liquid storage tank;
the switch module outputs a switch signal to the battery controller, the switch signal indicates the battery controller to send a switch action instruction to the electromagnetic valve, the switch action instruction is used for indicating the electromagnetic valve to execute a switch action, and the switch action is used for indicating the electromagnetic valve to open or close the liquid storage tank so as to release or stop releasing liquid in the liquid storage tank.
Furthermore, the system also comprises a cooling circulating pump, the temperature detection module sends a liquid pumping signal to the battery controller before outputting a protection signal to the battery controller, the liquid pumping signal is used for indicating the battery controller to send a liquid pumping action instruction to the cooling circulating pump, the liquid pumping action instruction is used for instructing the cooling circulating pump to perform liquid pumping action, the liquid pumping action is used for instructing the cooling circulating pump to pump away the cooling medium in the cooling flow channel, after the cooling medium is pumped out of the cooling flow channel, the battery controller sends a switching action instruction to the liquid outlet three-way valve, the switching action instruction is used for indicating the action of a switching pipeline of the liquid outlet three-way valve, and the switching pipeline acts to switch the communication between the third cooling pipe and the fourth cooling pipe into the communication between the third cooling pipe and the fifth cooling pipe.
Furthermore, the surface of the bottom plate of the box body, which is close to the accommodating cavity, is provided with a connecting hole, the connecting hole communicates the cooling flow channel with the liquid-proof vent valve, the liquid-proof vent valve is arranged between the battery part and the side wall of the accommodating cavity, the liquid-proof vent valves are multiple, gas can pass through the liquid-proof vent valve, and liquid cannot pass through the liquid-proof vent valve.
Furthermore, the box bottom plate is of an integrally formed structure, the cooling flow channel is located in the box bottom plate, and the surface, close to the containing cavity, of the box bottom plate is connected with the battery part in a heat conduction mode through the heat conduction structural adhesive.
Further, the box bottom plate is the components of a whole that can function independently structure, the box bottom plate includes:
the surface of the heat-conducting plate, which is close to the accommodating cavity, is in heat-conducting connection with the battery part through the heat-conducting structural adhesive;
the runner plate is provided with an accommodating space, and the accommodating space is formed by enclosing two runner long walls arranged at intervals, two runner wide walls arranged at intervals and a runner bottom plate of the runner plate;
the two long ends of the flow deflector are respectively connected with the heat conducting plate and the flow channel bottom plate, one wide end of the flow deflector is connected with one wide wall of the flow channel plate, the other wide end of the flow deflector is arranged at intervals with the other wide wall of the flow channel plate, the number of the flow deflectors is multiple, and the flow deflectors are arranged at intervals;
the cooling flow channel is formed by the adjacent two flow deflectors, the heat conducting plate and the area between the flow channel plates, the number of the cooling flow channels is multiple, and cooling media circulate in the cooling flow channel.
According to another aspect of the invention, a vehicle is provided, which comprises a battery pack, wherein the battery pack is the battery pack.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a battery pack which can be disassembled in a nondestructive mode and can be actively controlled in thermal runaway.
Drawings
FIG. 1 is an exploded view of a battery pack structure according to the present invention;
FIG. 2 is a schematic diagram of a battery pack according to the present invention;
FIG. 3 is a schematic view of the structure of the case of the present invention;
FIG. 4 is an enlarged view of part A of FIG. 3;
FIG. 5 is a schematic view of the liquid outlet assembly and liquid inlet assembly of the present invention;
FIG. 6 is a schematic structural diagram of a liquid inlet assembly;
FIG. 7 is a schematic view of a liquid outlet assembly;
FIG. 8 is a schematic structural diagram of a bottom plate of the box body;
fig. 9 is a schematic view of the structural connection of the electrical components of the present invention.
In the figure: 100. a box body; 200. a battery section; 300. heat-conducting structural adhesive; 400. a battery controller; 500. a temperature detection module; 600. a switch module; 700. a cooling circulation pump; 110. a box body frame; 120. a box body bottom plate; 130. a liquid inlet component; 140. a liquid outlet assembly; 150. a liquid-proof gas-permeable valve; 111. a cooling tube passing hole; 121. a cooling flow channel; 131. a first cooling pipe; 132. a second cooling pipe; 133. a liquid storage tank; 141. a liquid outlet three-way valve; 142. a fourth cooling tube; 143. a third cooling pipe; 144. a fifth cooling pipe; 151. connecting holes; 1211. a liquid inlet of the bottom plate; 1212. a bottom plate liquid outlet; 1331. an electromagnetic valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to the attached drawings of the specification 1 to 9, the invention provides a technical scheme: a battery pack, comprising: the liquid cooling device comprises a box body 100, a battery part 200, heat-conducting structural adhesive 300, a cooling flow channel 121, a liquid-proof air-permeable valve 150, a liquid inlet assembly 130 and a liquid outlet assembly 140; the box body 100 comprises a box body frame 110 and a box body bottom plate 120, and an accommodating cavity is defined by the box body frame 110 and the box body bottom plate 120; the battery part 200 is arranged in the accommodating cavity, and the battery part 200 is a single battery cell or a battery module comprising a plurality of battery cells; the battery part 200 is bonded to the inner surface of the case bottom plate 120 by the heat conductive structural adhesive 300 to realize heat conductive connection; the liquid inlet assembly 130 and the liquid outlet assembly 140 are arranged in the accommodating cavity; the cooling flow channel 121 is disposed on the bottom plate 120 of the box body, the cooling flow channel 121 has a bottom plate liquid inlet 1211 and a bottom plate liquid outlet 1212, the bottom plate liquid inlet 1211 is communicated with the liquid inlet assembly 130, the bottom plate liquid outlet 1212 is communicated with the liquid outlet assembly 140, and the liquid inlet assembly 130 and the liquid outlet assembly 140 are communicated with the outside of the box body 100, wherein the cooling flow channel 121 is used for circulating a cooling medium, and the cooling medium dissipates heat to the battery part 200 through the liquid inlet assembly 130, the cooling flow channel 121 and the liquid outlet assembly 140; the liquid and gas prevention and ventilation valves 150 are disposed in the accommodating cavity, and the liquid and gas prevention and ventilation valves 150 are communicated with the cooling flow channel 121.
In this embodiment, the box frame 110 and the box bottom plate 120 are connected by welding or bonding to form the accommodating cavity of the battery part 200, and the box frame 110 is preferably made of an aluminum profile material, so that the weight can be reduced on the premise of ensuring the strength.
Preferably, as shown in fig. 3, the box frame 110 includes long frames and wide frames, wherein the long frames are disposed at intervals, the wide frames include front wide frames and rear wide frames, the accommodating cavity is defined by the long frames, the wide frames and the box bottom plate 120, the front wide frames are provided with cooling pipe through holes 111, and the battery part 200 is disposed at intervals with the long frames and the wide frames.
Preferably, as shown in fig. 4 and 6, the liquid inlet assembly 130 includes a first cooling pipe 131, a second cooling pipe 132 and a liquid storage tank 133, the first cooling pipe 131 is respectively communicated with the bottom plate liquid inlet 1211, the second cooling pipe 132 and the liquid storage tank 133, the second cooling pipe 132 is arranged through the cooling pipe through hole 111 and is communicated with the outside of the box 100, an external cooling medium flows in through the second cooling pipe 132, and the second cooling pipe 132 is a one-way pipe; the liquid storage tank 133 includes a solenoid valve 1331, and the release or stop of the liquid in the liquid storage tank 133 can be realized by controlling the solenoid valve 1331.
In this embodiment, the liquid in reservoir 133 is preferably liquid nitrogen.
Preferably, as shown in fig. 7, the liquid outlet assembly 140 includes a third cooling pipe 143, a fourth cooling pipe 142, a fifth cooling pipe 144 and a liquid outlet three-way valve 141, one end of each of the third cooling pipe 143, the fourth cooling pipe 142 and the fifth cooling pipe 144 is respectively communicated with the liquid outlet three-way valve 141, the other end of the third cooling pipe 143 is communicated with the bottom plate liquid outlet 1212, the other end of the fourth cooling pipe 142 is communicated with the outside of the box 100 through the cooling pipe passing hole 111, and the other end of the fifth cooling pipe 144 is communicated with the inside of the accommodating cavity.
Preferably, as shown in fig. 9, it further includes a battery controller 400, a temperature detection module 500, and a switch module 600; the battery controller 400 sends an actuation command to the solenoid valve 1331; the temperature detection module 500 is configured to detect a temperature of the battery portion 200, where the temperature of the battery portion 200 reaches a threshold, the temperature detection module 500 outputs a protection signal to the battery controller 400, where the protection signal instructs the battery controller 400 to send a protection action instruction to the electromagnetic valve 1331, the protection action instruction is configured to instruct the electromagnetic valve 1331 to perform a protection action, and the protection action is configured to instruct the electromagnetic valve 1331 to open the liquid storage tank 133 and release liquid in the liquid storage tank 133; the switch module 600 outputs a switch signal to the battery controller 400, the switch signal instructs the battery controller 400 to send a switch action instruction to the solenoid valve 1331, the switch action instruction is used for instructing the solenoid valve 1331 to execute a switch action, and the switch action is used for instructing the solenoid valve 1331 to open or close the liquid storage tank 133 so as to release or stop releasing the liquid in the liquid storage tank 133.
Preferably, as shown in fig. 9, a cooling circulation pump 700 is further included; the temperature detection module 500 also sends a pumping signal to the battery controller 400 before outputting a protection signal to the battery controller 400, the pumping signal is used to instruct the battery controller 400 to issue a pumping command to the cooling circulation pump 700, the liquid pumping action command is used to instruct the cooling circulation pump 700 to perform a liquid pumping action, the liquid pumping action is used to instruct the cooling circulation pump 700 to pump away the cooling medium in the cooling flow channel 121, after the cooling medium is pumped out of the cooling flow channel 121, the battery controller 400 sends a switching action command to the liquid outlet three-way valve 141, the switching operation command is used to instruct the liquid outlet three-way valve 141 to switch the operation of the line for switching the communication between the third cooling pipe 143 and the fourth cooling pipe 142 to the communication between the third cooling pipe 143 and the fifth cooling pipe 144.
Preferably, as shown in fig. 2, 3 and 4, a connection hole 151 is formed on a surface of the box bottom plate 120 close to the accommodating cavity, the connection hole 151 communicates the cooling flow channel 121 with the liquid-proof air-permeable valve 150, and the liquid-proof air-permeable valve 150 is disposed between the battery part 200 and a side wall of the accommodating cavity.
Preferably, gas can pass through the liquid-proof vent valve 150, and liquid cannot pass through the liquid-proof vent valve 150, in this embodiment, a metal threaded vent valve or a plastic snap vent valve can be selected.
In this embodiment, when the temperature detection module 500 detects that the temperature of the battery part 200 in the battery pack exceeds the threshold value, the battery pack is in a thermal runaway state, at this time, the temperature detection module 500 outputs a protection signal to the battery controller 400, the protection signal instructs the battery controller 400 to send a protection action command to the electromagnetic valve 1331, the protection action command is used for instructing the electromagnetic valve 1331 to execute a protection action, and the protection action is used for instructing the electromagnetic valve 1331 to open the liquid storage tank 133 and release the liquid in the liquid storage tank 133, so that the battery pack in the thermal runaway state is automatically protected, and greater loss to the vehicle is reduced.
In this embodiment, when the battery pack needs to be disassembled or the thermal runaway needs to be actively controlled, the low-temperature liquid in the liquid storage tank 133 can be released through the switch module 600, the liquid enters the cooling flow channel 121 through the first cooling pipe 131 for circulation, and the second cooling pipe 132 is a unidirectional flow pipe, so that the low-temperature liquid cannot flow back; the purpose of reducing the adhesive force of the heat-conducting structural adhesive 300 or the purpose of inhibiting thermal runaway of the battery part 200 can be achieved by rapidly cooling the interior of the battery pack; meanwhile, low-temperature liquid can be evaporated into low-temperature gas in the circulating process, the low-temperature gas enters the containing cavity of the battery pack through the liquid-proof ventilation valve 150, and the liquid nitrogen is selected as the low-temperature gas to cool the battery part 200 in the containing cavity in the embodiment, so that the strengthening and cooling effects are achieved, and the flame-retardant effect is also achieved. The number of the liquid-proof and gas-permeable valves 150 may be increased or decreased according to the effect of practical use. Before the low-temperature liquid is released, the cooling medium in the cooling flow channel 121 is pumped back to the cooling medium tank of the whole vehicle, and then the liquid outlet three-way valve 141 of the liquid outlet assembly 140 is controlled to change the liquid flowing to the outside of the box body 100 through the fourth cooling pipe 142 into the liquid flowing to the accommodating cavity through the fifth cooling pipe 144.
Preferably, the case bottom plate 120 is an integrally formed structure, the cooling channel 121 is located in the case bottom plate 120, and a surface of the case bottom plate 120 close to the receiving cavity is connected to the battery part 200 through the heat conducting structural adhesive 300 in a heat conducting manner.
Preferably, as shown in fig. 8, the box bottom plate 120 is a split structure, and the box bottom plate 120 includes: a heat-conducting plate 122, a flow passage plate 123 and a flow deflector 124; the surface of the heat conducting plate 122 close to the accommodating cavity is connected with the battery part 200 through the heat conducting structural adhesive 300 in a heat conducting manner; the runner plate 123 is provided with an accommodating space, and the accommodating space is defined by two runner long walls arranged at intervals, two runner wide walls arranged at intervals and a runner bottom plate of the runner plate 123; two long ends of the guide plate 124 are respectively connected to the heat conducting plate 122 and the flow channel bottom plate, one wide end of the guide plate 124 is connected to one wide wall of the flow channel plate 123, the other wide end of the guide plate 124 is spaced from the other wide wall of the flow channel plate 123, and a plurality of guide plates 124 are spaced from each other; the cooling flow channel 121 is formed in an area between two adjacent guide vanes 124, the heat conducting plate 122, and the flow channel plate 123, the number of the cooling flow channels 121 is plural, and the cooling medium in the plural cooling flow channels 121 flows in an arrow direction.
According to another aspect of the invention, a vehicle is provided, which comprises a battery pack, wherein the battery pack is the battery pack.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. A battery pack, comprising:
the box body comprises a box body frame and a box body bottom plate, and an accommodating cavity is defined by the box body frame and the box body bottom plate;
the battery part is arranged in the accommodating cavity and is a single battery cell or a battery module comprising a plurality of battery cells;
the battery pack is bonded on the inner surface of the box body bottom plate through the heat-conducting structural adhesive so as to realize heat-conducting connection;
the liquid inlet assembly and the liquid outlet assembly are arranged in the accommodating cavity;
the cooling flow channel is arranged on a bottom plate of the box body and provided with a bottom plate liquid inlet and a bottom plate liquid outlet, the bottom plate liquid inlet is communicated with the liquid inlet assembly, the bottom plate liquid outlet is communicated with the liquid outlet assembly, the liquid inlet assembly and the liquid outlet assembly are communicated with the outside of the box body, and cooling media dissipate heat of the battery part through the liquid inlet assembly, the cooling flow channel and the liquid outlet assembly;
and the liquid-proof ventilation valves are arranged in the accommodating cavity and communicated with the cooling flow channel.
2. The battery pack according to claim 1, wherein the case frame comprises a long frame and a wide frame, the long frame and the wide frame are spaced apart from each other, the wide frame comprises a front wide frame and a rear wide frame, the accommodating cavity is defined by the long frame, the wide frame and the case bottom plate, the front wide frame is provided with cooling pipe through holes, and the battery part is spaced apart from the long frame and the wide frame.
3. The battery pack according to claim 2, wherein the liquid inlet assembly comprises a first cooling pipe, a second cooling pipe and a liquid storage tank, the first cooling pipe is respectively communicated with the liquid inlet of the bottom plate, the second cooling pipe and the liquid storage tank, the second cooling pipe is arranged through the cooling pipe via hole and is communicated with the outside, an external cooling medium flows in through the second cooling pipe, and the second cooling pipe is a one-way pipe; the liquid storage tank comprises an electromagnetic valve, and the electromagnetic valve can be controlled to release or stop liquid in the liquid storage tank.
4. The battery pack according to claim 3, wherein the liquid outlet assembly comprises a third cooling pipe, a fourth cooling pipe, a fifth cooling pipe and a liquid outlet three-way valve, one end of the third cooling pipe, one end of the fourth cooling pipe and one end of the fifth cooling pipe are respectively communicated with the liquid outlet three-way valve, the other end of the third cooling pipe is communicated with the liquid outlet of the bottom plate, the other end of the fourth cooling pipe penetrates through the cooling pipe through hole to be communicated with the outside, and the other end of the fifth cooling pipe is communicated with the inside of the accommodating cavity.
5. The battery pack of claim 4, further comprising:
the battery controller sends an action instruction to the electromagnetic valve;
the temperature detection module is used for detecting the temperature of the battery part, the temperature of the battery part reaches a threshold value, the temperature detection module outputs a protection signal to the battery controller, the protection signal indicates the battery controller to send a protection action instruction to the electromagnetic valve, the protection action instruction is used for indicating the electromagnetic valve to execute a protection action, and the protection action is used for indicating the electromagnetic valve to open the liquid storage tank and release liquid in the liquid storage tank;
the switch module outputs a switch signal to the battery controller, the switch signal indicates the battery controller to send a switch action instruction to the electromagnetic valve, the switch action instruction is used for indicating the electromagnetic valve to execute a switch action, and the switch action is used for indicating the electromagnetic valve to open or close the liquid storage tank so as to release or stop releasing liquid in the liquid storage tank.
6. The battery pack according to claim 5, further comprising a cooling circulation pump; the temperature detection module is to still send the drawing liquid signal before battery controller output protection signal to battery controller, the drawing liquid signal is used for instructing battery controller to send drawing liquid action instruction to cooling circulation pump, drawing liquid action instruction is used for instructing cooling circulation pump execution drawing liquid action, drawing liquid action is used for instructing cooling circulation pump will cooling medium in the cooling runner is taken out, cooling medium takes out after the cooling runner, battery controller to go out liquid three-way valve and send conversion action instruction, conversion action instruction is used for instructing the action of liquid three-way valve conversion pipeline, conversion pipeline action will the intercommunication between third cooling tube and the fourth cooling tube converts into the intercommunication between third cooling tube and the fifth cooling tube.
7. The battery pack according to claims 1 to 6, wherein a connecting hole is formed in a surface of the bottom plate of the case body near the accommodating cavity, the connecting hole connects the cooling flow channel with the liquid-proof and gas-permeable valve, the liquid-proof and gas-permeable valve is disposed between the battery part and the side wall of the accommodating cavity, gas can pass through the liquid-proof and gas-permeable valve, and liquid cannot pass through the liquid-proof and gas-permeable valve.
8. The battery pack according to claim 1, wherein the case bottom plate is an integrally formed structure, the cooling channel is located in the case bottom plate, and a surface of the case bottom plate adjacent to the receiving cavity is thermally connected to the battery portion through the thermally conductive adhesive.
9. The battery pack of claim 1, wherein the case bottom plate is a split structure, and the case bottom plate comprises:
the surface of the heat-conducting plate, which is close to the accommodating cavity, is in heat-conducting connection with the battery part through the heat-conducting structural adhesive;
the runner plate is provided with an accommodating space, and the accommodating space is formed by enclosing two runner long walls arranged at intervals, two runner wide walls arranged at intervals and a runner bottom plate of the runner plate;
the two long ends of the flow deflector are respectively connected with the heat conducting plate and the flow channel bottom plate, one wide end of the flow deflector is connected with one wide wall of the flow channel plate, the other wide end of the flow deflector is arranged at intervals with the other wide wall of the flow channel plate, the number of the flow deflectors is multiple, and the flow deflectors are arranged at intervals;
the cooling flow channel is formed by the adjacent two flow deflectors, the heat conducting plate and the area between the flow channel plates, the number of the cooling flow channels is multiple, and cooling media circulate in the cooling flow channel.
10. A vehicle comprising a battery pack according to any one of claims 1 to 9.
CN202111663775.3A 2021-12-31 2021-12-31 Battery pack and vehicle with same Pending CN114374020A (en)

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