CN210774548U

CN210774548U - Battery pack cooling liquid leakage detection device and electric automobile

Info

Publication number: CN210774548U
Application number: CN201920909881.7U
Authority: CN
Inventors: 陈卫宇
Original assignee: TECHRAD (ZHEJIANG) AUTOMOTIVE THERMAL SYSTEMS CORP
Current assignee: TECHRAD (ZHEJIANG) AUTOMOTIVE THERMAL SYSTEMS CORP
Priority date: 2019-06-03
Filing date: 2019-06-17
Publication date: 2020-06-16
Anticipated expiration: 2029-06-17

Abstract

The utility model relates to a not only weeping detectivity is high, but also can carry out secondary hierarchical detection's battery package internal cooling liquid leakage detection device and electric automobile, the lower terminal surface of plastic film and plastic film has been laid to the up end of the cooling plate in the battery package, first detection circuitry includes a first bus, many first branches, a second bus and many second branches, lower terminal surface one side of plastic film is equipped with first bus, the opposite side is equipped with second bus and first bus and second bus interval and is equipped with first branch and second branch in turn, one side end and the first bus of many first branches are connected, one side end and the second bus electricity of many second branches are connected. The advantages are that: firstly, the leakage detection can be realized when a small amount of cooling liquid leaks out from the cooling liquid leakage detection device in the battery pack, so that the sensitivity of the leakage detection is better; and secondly, the cooling liquid leakage detection device in the battery pack can perform two-stage detection according to the threat degree of the cooling liquid to the battery pack.

Description

Battery pack cooling liquid leakage detection device and electric automobile

Technical Field

The utility model relates to a not only weeping detectivity is high, can carry out the secondary and detect in grades moreover, plays good guard action's battery package internal cooling liquid leakage detection device and electric automobile to the group battery simultaneously, belongs to new forms of energy electric automobile technical field.

Background

CN 108896248A, "a liquid leakage detection device", is applied to the battery package, the battery package includes liquid cold plate and battery module, includes: a protective layer and a detection harness; the protective layer is positioned on one side of the liquid cooling plate and fixedly connected with the liquid cooling plate, and the protective layer is provided with a penetration hole; the detection wire harness is sleeved with a liquid suction pipe, the liquid suction pipe is communicated with the penetration hole, the detection wire harness is connected with a battery management system and used for detecting whether the liquid suction pipe absorbs liquid to determine the liquid leakage condition of the battery pack, and when the detection wire harness detects that liquid leakage exists in the battery pack, an electrifying loop is formed by the detection wire harness and the battery management system. The protective layer is rubber. The detection wire harness is a copper wire or an aluminum wire with the outer surface being a conductor. The material of the pipette is a mixture of rayon fibers or a nonwoven fabric. The penetration hole includes a plurality ofly, evenly distributed is in the protection layer is all around, the measuring wire is restrainted and is established the protection layer is all around. And the pipette is provided with a through hole which is communicated with the penetration hole. The leakage detection device is arranged in the battery pack, and the battery pack is connected with one end of the battery management system through a detection wire harness. The liquid cooling device is characterized by further comprising a plurality of liquid cooling plates and a plurality of liquid leakage detection devices, wherein the plurality of liquid cooling plates are connected with the plurality of liquid leakage detection devices in a one-to-one correspondence mode respectively. And if the detection wire harness and the battery management system form a power-on loop, the battery management system is used for controlling the electric automobile to stop running when the power-on loop is switched on. The battery management system is electrically connected with the display screen, and when the battery management system controls the electric automobile to stop running, the display screen simultaneously displays leakage information. The disadvantages are that: firstly, when a large amount of leaked liquid occurs in the leaked liquid detection device, the leaked liquid detection device can detect the leaked liquid, and the sensitivity of the leaked liquid detection is relatively poor; secondly, the leakage detection device can only carry out general detection (one-time detection), so that once leakage is detected, the device can only wait for rescue passively.

SUMMERY OF THE UTILITY MODEL

The design purpose is as follows: in order to avoid the defects in the background art, the battery pack cooling liquid leakage detection device and the electric automobile are designed, wherein the battery pack cooling liquid leakage detection device is high in leakage detection sensitivity, can perform secondary grading detection and has a good protection effect on a battery pack.

The design scheme is as follows: the design purpose is realized.

1. The lower terminal surface of plastic film is equipped with the design of first detection circuitry, is one of the technical characteristics of the utility model. The purpose of this design is: when the cooling device is used, when a liquid leakage point appears at the upper end of the cooling plate, a bulge is formed at the position, close to the liquid leakage point, of the leaked cooling liquid (due to the fact that the plastic film has certain elasticity, the liquid leakage can form the bulge under the condition that the plastic film is not broken by the cooling liquid), then when the cooling liquid in the bulge forms a closed loop with the first detection circuit, the first detection circuit can upload a current signal or a voltage signal generated in the closed loop to a central controller of the electric automobile for processing, the central controller of the electric automobile can send a warning (primary warning) to a driver after receiving the current signal or the voltage signal, the warning driver needs to go to overhaul as soon as possible, and whether the liquid leakage appears on the upper end face of the cooling plate (the upper end face of the cooling plate is used for placing a battery pack, and the service life of the battery pack is seriously influenced by the liquid leakage appearing at the position) or not appears; in addition, because first detection circuitry includes a first bus, many first branches, a second bus and many second branches, lower terminal surface one side of plastic film is equipped with first bus, the opposite side is equipped with the second bus and first branch and second branch are equipped with in turn between first bus and the second bus, one side end of many first branches is connected with first bus electricity, one side end of many second branches is connected with the second bus electricity, and first detection circuitry just can detect (detection sensitivity is high) when a small amount of weeping appears in the cooling plate upper end like this (the length or the diameter of swell and the interval between the first branch of arbitrary a set of adjacent and second branch match), and the emergence of swell is favorable to the maintainer to find the weeping point fast simultaneously.

2. The design that the four sides of plastic film set up respectively on the cooling plate inclined plane that corresponds is the technical characteristics two of the utility model. The purpose of this design is: because the non-cooling region part of cooling plate upper end is the inclined plane and the four sides of plastic film set up respectively on the cooling plate inclined plane that corresponds, and the plastic film is the waterproof membrane simultaneously, so long as the plastic film does not have the damage, so leaked coolant liquid will flow down along the inclined plane of cooling plate at last, and the coolant liquid can not exert an influence to the group battery in the short time, and the coolant liquid can not cause urgent threat to the group battery promptly.

3. The design that the up end of plastic film is equipped with second detection circuitry is the utility model discloses a technical feature is three. The purpose of this design is: the upper end face of plastic film is equipped with the second detection circuitry, when the plastic film was damaged and the coolant liquid upwards spills over the plastic film, the coolant liquid that leaks at this moment will make the second detection circuitry of original open circuit on the plastic film form closed circuit, the second detection circuitry can be with the central accuse that gives electric automobile on the current signal or the voltage signal that produce in the closed circuit handles, electric automobile's central accuse can send to the pilot after receiving this current signal or voltage signal and warn electric automobile's central accuse and can warn the pilot after receiving this signal (secondary warning), driver need carry out safe parking immediately at this moment and flame-out, etc. rescue.

4. The lower terminal surface of plastic film is equipped with the one deck insulating film, and is the design that the array was equipped with the through-hole on the insulating film, is the technical characteristics of the utility model four. The purpose of this design is: the lower end surface of the plastic film is provided with a layer of insulating film; firstly, the insulating film plays insulating effect to first detection circuitry (printed circuit), secondly the insulating film plays the guard action to first detection circuitry (printed circuit) with the plastic film together, avoid first detection circuitry (printed circuit) fracture or damage appear in the installation with the cooling plate, thereby influence first detection circuitry's detection effect, thirdly because it is the array and is equipped with the through-hole on the insulating film, this through-hole link up the upper and lower both ends face of insulating film, and the through-hole just is greater than the interval of this adjacent first separated time and second separated time to a set of adjacent first separated time and second separated time and through-hole's diameter, the setting of insulating film can not influence first detection circuitry's detection function promptly.

5. The design that the lower part of protecting sheathing in the battery package is equipped with weeping discharge hole and weeping discharge hole department is equipped with the solenoid valve is the technical characteristics of the utility model five. The purpose of this design is: the central control of the electric automobile sends out a warning, and simultaneously, the central control opens the control electromagnetic valve, so that leaked cooling liquid can flow out of the protective shell in time, and the damage of the cooling liquid to the lithium battery pack is reduced; in addition, when the battery pack is normally used, the electromagnetic valve is in a closed state, so that external dust and moisture cannot enter the protective shell.

The technical scheme 1: the utility model provides a battery package internal cooling liquid leakage detection device, includes the battery package, the lower terminal surface that plastic film and plastic film were laid to the up end of the cooling plate in the battery package is equipped with first detection circuitry, first detection circuitry includes a first bus, many first branches, a second bus and many second branches, the lower terminal surface one side of plastic film is equipped with first bus, opposite side and is equipped with first branch and second branch between second bus and first bus and the second bus in turn, one side end and the first bus electric connection of many first branches, one side end and the second bus electric connection of many second branches.

The technical scheme 2 is as follows: an electric vehicle includes a battery pack cooling fluid leakage detection device.

Compared with the background art, the utility model, firstly, the leakage detection can be realized when a small amount of cooling liquid leaks out from the cooling liquid leakage detection device in the battery pack, so the sensitivity of the leakage detection is better; secondly, the cooling liquid leakage detection device in the battery pack can carry out two-stage detection according to the threat degree of the cooling liquid to the battery pack, and a driver can carry out maintenance before driving by himself when first-stage warning appears, and needs to contact a trailer for maintenance when second-stage warning appears.

Drawings

Fig. 1 is a schematic sectional view showing a structure of a cooling liquid leakage detecting apparatus in a battery pack.

Fig. 2 is a schematic view of a structure in which the cooling plate is combined with a plastic film.

Fig. 3 is a schematic bottom view of a plastic film printed with a first detection circuit.

Fig. 4 is a schematic bottom view of a plastic film (with an additional insulating film) printed with a first detection circuit.

Fig. 5 is an enlarged view of a portion a in fig. 4.

Fig. 6 is a schematic top view of a plastic film on which a first detection circuit and a second detection circuit are printed.

Fig. 7 is a schematic sectional view showing a structure of a device for detecting a leakage of a cooling liquid in a battery pack (including a leakage discharge hole and an electromagnetic valve).

Detailed Description

Example 1: reference is made to fig. 1-5. A device for detecting leakage of cooling liquid in a battery pack comprises the battery pack 1, wherein the battery pack 1 comprises a cooling plate 2, a lithium battery pack 10 and a protective shell 7, the cooling plate 2 is arranged in an inner cavity of the protective shell 7, the lithium battery pack 10 is arranged at the upper end of the cooling plate 2, the protective shell 7 plays a role in protecting the lithium battery pack 10, the cooling plate 2 plays a role in cooling the lithium battery pack 10, a plastic film 3 is laid on the upper end face of the cooling plate 2 in the battery pack 1, a first detection circuit 4 is arranged on the lower end face of the plastic film 3, the first detection circuit 4 and the plastic film 3 are of an integral structure, the first detection circuit 4 is positioned between the plastic film 3 and the cooling plate 2 when the plastic film 3 is arranged on the upper end face of the cooling plate 2, the plastic film 3 laid on the upper end face of the cooling plate 2 is fixedly connected with the upper end face of the cooling plate 2, namely the plastic film 3 can be adhered on the upper end face of the, the first detection circuit 4 comprises a first bus 41, a plurality of first branches 42, a second bus 43 and a plurality of second branches 44, a first bus 41 is arranged on one side of the lower end surface of the plastic film 3, a second bus 43 is arranged on the other side of the lower end surface of the plastic film, a first branch line 42 and a second branch line 44 are alternately arranged between the first bus 41 and the second bus 43, one side end of the first branch lines 42 is electrically connected with the first bus 41, one side end of the second branch lines 44 is electrically connected with the second bus 43, the distance between the adjacent first branch lines 42 and second branch lines 44 is less than or equal to 10mm, the distance between the adjacent first and

second branches

42 and 44 is 5mm, the first and

second branches

42 and 44 are not in contact with each other, the first branch 42 is not in contact with the second bus 43, and the first bus 41 is not in contact with the second branch 44; namely, a first bus 41 is arranged on one side of the lower end surface of the plastic film 3 along the width direction of the plastic film 3, a second bus 43 is arranged on the other side of the lower end surface of the plastic film 3 along the width direction of the plastic film 3, a plurality of first branch lines 42 and a plurality of second branch lines 44 are arranged on the lower end surface of the plastic film 3, the plurality of first branch lines 42 and the plurality of second branch lines 44 are respectively arranged along the length direction of the plastic film 3, the first branch lines 42 and the second branch lines 44 are arranged side by side, and the first branch lines 42 and the second branch lines 44 are alternately; the first bus 41 is connected with the positive pole of a power supply through a conducting wire, and the second bus 43 is connected with the negative pole of the power supply through a conducting wire (or the first bus 41 is connected with the negative pole of the power supply through a conducting wire, and the second bus 43 is connected with the positive pole of the power supply through a conducting wire); the first detection circuit 4 further comprises a current sensor or a voltage sensor, when the leaked liquid enables any adjacent first branch line 42 and any adjacent second branch line 44 to be conducted, the first detection circuit 4 forms a closed loop, the current sensor or the voltage sensor can detect a current signal or a voltage signal in the closed loop, a signal output end of the current sensor or the voltage sensor is connected with a signal input end of a central control of the electric automobile through a data line, and the central control of the electric automobile can warn a driver (embodied in the form of a warning signal or warning sound) after receiving the signal. The first detection circuit 4 is a printed circuit printed on the plastic film 3.

The four side surfaces of the cooling plate 2 are inclined planes, the upper end face of the cooling plate 2 is a plane, the upper end face is a planar cooling plate 2 area and is an effective cooling area, a cooling liquid channel is arranged in the cooling plate 2, the specific structure of the cooling plate 2 is not repeated in the prior art, a liquid outlet of a cooling liquid circulating system is communicated with a liquid inlet of the cooling liquid channel through a pipeline, a liquid return port is communicated with a liquid outlet of the cooling liquid channel through a pipeline, the plastic film 3 is a waterproof film, and the four side edges of the plastic film 3 are respectively arranged on the corresponding inclined planes of the cooling plate 2.

The lower end face of the plastic film 3 is provided with a layer of insulating film 6, the first detection circuit 4 is positioned between the plastic film 3 and the insulating film 6, the plastic film 3 and the insulating film 6 can be integrally hot-pressed or bonded, through holes 61 are formed in the insulating film 6 in an array mode, the through holes 61 penetrate through the upper end face and the lower end face of the insulating film 6, the through holes 61 are over against a group of adjacent first branch lines 42 and second branch lines 44, the diameter of each through hole 61 is larger than the distance between the adjacent first branch lines 42 and the adjacent second branch lines 44, when any through hole 61 is filled with leaked cooling liquid, the cooling liquid enables the first branch lines 42 and the second branch lines 44 over the through holes 61 to be conducted, and the first detection circuit 4 forms a closed circuit.

Example 2: reference is made to fig. 6 on the basis of example 1. The upper end surface of the plastic film 3 is provided with a second detection circuit 5, the connection structure of the second detection circuit 5 is the same as that of the first detection circuit 4, and the component composition and distribution of the second detection circuit 5 are also the same as those of the first detection circuit 4; namely, the second detection circuit 5 includes a first bus 41, a plurality of first branches 42, a second bus 43, and a plurality of second branches 44, the first bus 41 is disposed on one side of the upper end surface of the plastic film 3, the second bus 43 is disposed on the other side of the upper end surface of the plastic film, the first branches 42 and the second branches 44 are alternately disposed between the first bus 41 and the second bus 43, one side ends of the plurality of first branches 42 are electrically connected to the first bus 41, and one side ends of the plurality of second branches 44 are electrically connected to the second bus 43. The second detection circuit 5 is a printed circuit printed on the plastic film 3.

Example 3: reference is made to fig. 7 on the basis of examples 1 and 2. A leakage discharge hole 8 is formed in the lower part of the protective shell 7 in the battery pack 1, and an electromagnetic valve 9 is arranged at the leakage discharge hole 8; the signal input end of the electromagnetic valve 9 is connected with the signal output end of the central control of the electric automobile through a data line, and the central control opens the electromagnetic valve 9 when receiving a liquid leakage signal.

Example 4: on the basis of examples 1 and 2 and 3. An electric vehicle includes a battery pack cooling fluid leakage detection device.

When the cooling device is used, when a leakage point appears at the upper end of the cooling plate 2, a bulge is formed at the position, close to the leakage point, of the plastic film 3 by leaked cooling liquid (due to the fact that the plastic film 3 has certain elasticity, the bulge can be formed by the leaked cooling liquid under the condition that the plastic film 3 is not broken by the cooling liquid), then when the first detection circuit 4 is formed into a closed loop by the cooling liquid in the bulge, the first detection circuit 4 can upload a current signal or a voltage signal generated in the closed loop to a central control of an electric automobile for processing, and the central control of the electric automobile can send a primary warning (embodied in the form of a warning signal or warning sound) to a driver after receiving the current signal or the voltage signal.

The coolant that leaks when the plastic film 3 is broken to the coolant liquid will flow to the up end of plastic film 3, and the second detection circuit 5 can be passed to the central accuse of electric automobile on the current signal or the voltage signal that produce in the closed loop and handle when the coolant liquid that flows out makes second detection circuit 5 form the closed loop, and the central accuse of electric automobile can send the second grade warning to the navigating mate after receiving this current signal or voltage signal (warning grade is higher, and the threat of this moment weeping to the group battery is great, and the urgency is stronger).

The control solenoid valve 9 is opened to well accuse when electric automobile's well accuse sends one-level warning or second grade warning, lets the coolant liquid that spills can flow out protecting sheathing 7 to reduce the harm that the coolant liquid caused lithium cell group 10.

It is to be understood that: although above-mentioned embodiment is right the utility model discloses a design has done more detailed word description, but these word descriptions, are only right the utility model relates to a simple word description of idea, rather than right the utility model relates to a restriction of idea, any do not surpass the utility model relates to a combination, increase or the modification of idea all fall into the utility model discloses a within the protection scope.

Claims

1. The utility model provides a battery pack cooling liquid leakage detection device, includes battery pack (1), characterized by: the battery pack is characterized in that a plastic film (3) is laid on the upper end face of a cooling plate (2) in the battery pack (1), a first detection circuit (4) is arranged on the lower end face of the plastic film (3), the first detection circuit (4) comprises a first bus (41), a plurality of first branch lines (42), a second bus (43) and a plurality of second branch lines (44), the first branch lines (42) and the second branch lines (44) are alternately arranged between the first bus (41) and the second bus (43) and on one side of the lower end face of the plastic film (3), the second bus (43) is arranged on the other side of the lower end face of the plastic film, one side end of each of the first branch lines (42) is electrically connected with the first bus (41), and one side end of each of the second branch lines (44) is electrically connected with the second bus (43).

2. The apparatus for detecting a leakage of a cooling liquid in a battery pack according to claim 1, wherein: the first detection circuit (4) is a printed circuit printed on the plastic film (3).

3. The apparatus for detecting a leakage of a cooling liquid in a battery pack according to claim 1, wherein: the four side surfaces of the cooling plate (2) are inclined planes, and the four side edges of the plastic film (3) are respectively arranged on the corresponding inclined planes of the cooling plate (2).

4. The apparatus for detecting leakage of cooling liquid in a battery pack according to claim 1, 2 or 3, wherein: the upper end face of the plastic film (3) is provided with a second detection circuit (5), and the connection structure of the second detection circuit (5) is the same as that of the first detection circuit (4).

5. The apparatus for detecting a leakage of a cooling liquid in a battery pack according to claim 4, wherein: the second detection circuit (5) is a printed circuit printed on the plastic film (3).

6. The apparatus for detecting a leakage of a cooling liquid in a battery pack according to claim 1 or 2, wherein: the lower end face of the plastic film (3) is provided with a layer of insulating film (6), the first detection circuit (4) is located between the plastic film (3) and the insulating film (6), and the insulating film (6) is provided with through holes (61) in an array manner.

7. The apparatus for detecting a leakage of a cooling liquid in a battery pack according to claim 1, wherein: the lower part of a protective shell (7) in the battery pack (1) is provided with a leakage discharge hole (8), and the leakage discharge hole (8) is provided with an electromagnetic valve (9).

8. An electric automobile, characterized by: comprising the cooling liquid leakage detecting device in a battery pack according to any one of claims 1 to 7.