CN108318827B - Liquid leakage detection device, system and electric vehicle - Google Patents
Liquid leakage detection device, system and electric vehicle Download PDFInfo
- Publication number
- CN108318827B CN108318827B CN201810186472.9A CN201810186472A CN108318827B CN 108318827 B CN108318827 B CN 108318827B CN 201810186472 A CN201810186472 A CN 201810186472A CN 108318827 B CN108318827 B CN 108318827B
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- leakage detection
- leakage
- battery module
- battery
- detection device
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- 238000001514 detection method Methods 0.000 title claims abstract description 92
- 239000007788 liquid Substances 0.000 title claims abstract description 58
- 238000009413 insulation Methods 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 2
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 19
- 101100489717 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND2 gene Proteins 0.000 description 17
- 238000010586 diagram Methods 0.000 description 6
- 239000000110 cooling liquid Substances 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000011258 core-shell material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
Abstract
The embodiment of the invention provides a leakage detection device and system and an electric vehicle, and relates to the technical field of power battery leakage detection. The leakage detection device comprises an insulating plate body, wherein the insulating plate body is arranged in the battery box body and is positioned below the battery module; the battery box body is provided with a box body through hole, and one end of the metal wire is connected with a grounding point outside the battery box body through the box body through hole; the leakage detection device further comprises a leakage detection circuit, wherein the leakage detection circuit is used for detecting the resistance between the negative electrode of the battery module and the grounding point, and judging whether liquid leakage exists in the battery module or the liquid cooling flat tube or not by detecting the change condition of the insulation resistance between the negative electrode of the battery module and the grounding point, so that short circuit caused by liquid leakage of the power battery is avoided, and the safety of the power battery is improved.
Description
Technical Field
The invention relates to the technical field of power battery leakage detection, in particular to a leakage detection device, a leakage detection system and an electric vehicle.
Background
The power battery is an important component of the electric automobile, and the insulation safety of the power battery is important to the electric automobile. If electrolyte leakage occurs in the battery core in the power battery, external short circuit among different modules can be caused, and the battery is triggered to fire; if the cooling liquid in the liquid cooling flat tube leaks, the electric cores at different positions form potential difference electrolytic cooling liquid under the action of the cooling liquid, so that the electric core electrolyte leaks due to corrosion of the single electric core shell, and the danger can be possibly caused.
At present, a power battery leakage detection circuit used for an electric automobile is used for judging the insulativity of a battery by detecting the resistance between a high-voltage part of the power battery and a battery box body.
However, the battery box body is subjected to electrophoresis treatment for rust prevention, so that a high-voltage to low-voltage passage is difficult to form through the battery box body, and therefore, leakage of single cell electrolyte in a power battery, leakage of cooling liquid in a liquid cooling flat tube or failure of box body sealing and water inflow are difficult to detect, and fault reporting is caused. Meanwhile, the battery is easy to damage human body during maintenance or detection.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a liquid leakage detection device, a liquid leakage detection system and an electric vehicle, and whether the liquid leakage fault exists in the battery box body can be detected through the liquid leakage detection device, so that the short circuit of a power battery caused by liquid leakage is avoided, and the safety of the power battery is improved.
In order to achieve the above object, the preferred embodiment of the present invention adopts the following technical scheme:
the embodiment of the invention provides a liquid leakage detection device which is applied to a power battery for liquid leakage detection, wherein the power battery comprises a battery box body, a battery module arranged in the battery box body and a liquid cooling flat tube for carrying out thermal management on the battery module;
the leakage detection device comprises an insulating plate body, wherein the insulating plate body is arranged in the battery box body and is positioned below the battery module;
the battery box body is provided with a box body through hole, and one end of the metal wire is connected with a grounding point outside the battery box body through the box body through hole;
the leakage detection device further comprises a leakage detection circuit, wherein the leakage detection circuit is used for detecting the resistance between the negative electrode of the battery module and the grounding point, and judging whether liquid leakage exists in the battery module or the liquid cooling flat tube or not by detecting the change condition of the insulation resistance between the negative electrode of the battery module and the grounding point, and the insulation resistance between the negative electrode of the battery module and the grounding point comprises the resistance between the negative electrode of the battery module and the insulating plate body and the resistance between the metal wire in the insulating plate and the grounding point.
Optionally, the insulating plate body is made of a material that absorbs liquid leakage, the material including a mica material.
Optionally, the metal wire is buried in the insulating plate body.
Alternatively, in a preferred embodiment of the present invention, the metal wire is buried in the insulating plate body in a detour.
In an embodiment of the present invention, the liquid leakage detection circuit includes: the first resistor and the capacitor are connected in series between the negative electrode of the battery module and the grounding point, and an RC charge-discharge loop is formed by the first resistor and the capacitor and an insulation resistor between the negative electrode of the battery module and the grounding point;
the leakage detection circuit further comprises a voltage source for charging the capacitor, and the voltage source is electrically connected between the first resistor and the capacitor;
the leakage detection circuit further comprises a voltage acquisition end, wherein the voltage acquisition end is connected between the first resistor and the grounding point and is used for acquiring voltage on an insulation resistor between the negative electrode of the battery module and the grounding point in the RC charge-discharge loop.
Optionally, in a preferred embodiment of the present invention, a protection resistor is further connected between the capacitor and the voltage source in the leakage detection circuit.
Optionally, in an embodiment of the present invention, the battery module includes a plurality of unit cells, the liquid cooling flat tube contacts with the unit cells, and at least one layer of liquid cooling flat tube is disposed between two adjacent layers of unit cells.
Optionally, the ground point comprises a body metal conductor.
The embodiment of the invention also provides a liquid leakage detection system, which comprises: BMS unit, terminal equipment, server and above-mentioned weeping detection device;
the BMS unit is connected with the leakage detection device and is used for generating leakage fault information according to the leakage condition detected by the leakage detection device;
the BMS unit is also in communication connection with the terminal equipment, and sends the leakage fault information to the terminal equipment, and the leakage fault information is uploaded to the server through the terminal equipment, so that technicians can maintain the leakage fault information.
The embodiment of the invention also provides an electric vehicle, which comprises a power battery and the liquid leakage detection device;
the power battery provides electric power for the electric vehicle;
the leakage detection device is used for detecting whether the power battery has leakage faults or not.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a leakage detection device according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a leakage detection circuit of the leakage detection device according to the embodiment of the present invention;
fig. 3 is a schematic diagram of insulation resistance between a negative electrode of a battery module and a ground point according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the relationship between the output voltage of the voltage acquisition terminal and the insulation resistance according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a leakage detection system according to an embodiment of the present invention.
Icon: 10-a liquid leakage detection device; 101-metal wires; 102-an insulating plate body; 103-a box through hole; 104-a liquid leakage detection circuit; c-capacitance; r1-a first resistor; r2-protection resistor; riso-insulation resistance; GND 1-ground; GND 2-negative electrode of the battery module; 20-BMS units; 30-terminal equipment; 40-server.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
First embodiment
As shown in fig. 1, an embodiment of the present invention provides a leakage detection device 10, which is applied to a power battery for detecting leakage, wherein the power battery includes a battery box, a battery module disposed inside the battery box, and a liquid cooling flat tube for performing thermal management on the battery module;
the leakage detection device 10 includes an insulating plate body 102, where the insulating plate body 102 is disposed inside the battery box and below the battery module;
the battery box is provided with a box through hole 103, and one end of the metal wire 101 is connected with a grounding point GND1 outside the battery box through the box through hole 103;
as shown in fig. 2 and 3, the leakage detection device 10 further includes a leakage detection circuit 104, where the leakage detection circuit 104 is configured to detect a resistance between the negative electrode GND2 of the battery module and the ground point GND1, and determine whether there is a liquid leakage in the battery module or the liquid cooling flat tube by detecting a change of an insulation resistance Riso between the negative electrode GND2 of the battery module and the ground point GND1, where the insulation resistance Riso between the negative electrode GND2 of the battery module and the ground point GND1 includes a resistance between the negative electrode GND2 of the battery module and the insulating plate body 102 and a resistance between the metal wire 101 in the insulating plate and the ground point GND 1.
Detection principle: when electrolyte leakage occurs in the single cells in the battery module or cooling liquid in the liquid cooling flat tube leaks, the leaked liquid is absorbed by the insulating plate body 102, so that the leaked liquid is in contact with the metal wires 101 arranged in the insulating plate body 102, and the leakage liquid has a conductive effect, so that the resistance between the negative electrode GND2 of the battery module and the insulating plate body 102 is reduced; meanwhile, the metal wire 101 disposed in the insulating plate body 102 is connected to the ground GND1, so as to form a path between the negative electrode GND2 of one battery module and the ground GND1, so that it can be determined whether the battery case of the power battery has a leakage fault by detecting the insulation resistance Riso between the negative electrode GND2 of the battery module and the ground GND 1.
Alternatively, in order to sufficiently absorb the leaked liquid inside the battery case, the leaked liquid is sufficiently brought into contact with the metal wire 101 in the insulating plate body 102 while reducing damage to the battery module by the leaked liquid, and the insulating plate body 102 is manufactured using a material having a function of absorbing the leaked liquid.
In the preferred embodiment of the present invention, the insulating plate body 102 is made of mica, and the shape of the insulating plate body 102 can be set according to the specific shape of the power battery.
Alternatively, in one embodiment of the present invention, the metal wire 101 is buried in the insulating plate body 102.
Referring to fig. 1, further, in order to increase the coverage area of the metal wire 101 in the insulating plate body 102, the metal wire 101 is buried in the insulating plate body 102 in a roundabout manner, so as to ensure that any position of the insulating plate body 102 absorbs the leakage liquid to make the leakage liquid contact with the metal wire 101. Compared with the whole covered metal wire, the roundabout arrangement mode can save a certain amount of metal wires 101, but still can ensure the sensitivity of liquid leakage detection. Meanwhile, the metal wires 101 may be arranged in a multi-point sampling manner, and the leakage position of the power battery may be specifically detected through multi-point sampling.
Referring to fig. 2, in an embodiment of the present invention, the leakage detection circuit 104 includes: the first resistor R1 and the capacitor C are connected in series between the negative electrode GND2 of the battery module and the grounding point GND1, and the first resistor R1, the capacitor C and the insulation resistor Riso between the negative electrode GND2 of the battery module and the grounding point GND1 form an RC charge-discharge loop;
the leakage detection circuit 104 further includes a voltage source Vin for charging the capacitor C, and the voltage source Vin is electrically connected between the first resistor R1 and the capacitor C;
the leakage detection circuit 104 further includes a voltage collection terminal Vout, where the voltage collection terminal Vout is connected between the first resistor R1 and the ground GND1, and the voltage collection terminal Vout is configured to collect a voltage on an insulation resistor Riso between the negative electrode GND2 of the battery module and the ground GND1 in the RC charge-discharge loop.
In the embodiment of the invention, the voltage source Vin adopts a square wave pulse voltage source Vin, the voltage of the voltage source Vin can be adjusted arbitrarily according to practical situations, when the voltage source Vin is at a high level, the voltage source Vin charges the capacitor C, when the voltage source Vin is at a low level, the capacitor C discharges, the first resistor R1, the capacitor C and the insulation resistor Riso between the negative electrode GND2 of the battery module and the ground point GND1 form an RC discharge loop, and the voltage at two ends of the insulation resistor Riso formed between the negative electrode GND2 of the battery module and the ground point GND1 can be collected through the voltage collecting end Vout. When no leakage occurs in the power battery, the insulation resistance Riso formed between the negative electrode GND2 and the grounding point GND1 of the battery module has a higher value, and the voltage value acquired by the voltage acquisition end Vout is large; when liquid leakage occurs in the power battery, the insulation resistance Riso formed between the negative electrode GND2 of the battery module and the ground point GND1 is reduced, and the voltage value collected by the voltage collecting terminal Vout is small.
As shown in fig. 4, a schematic diagram of the relationship between the output voltage of the voltage collecting terminal Vout and the insulation resistance Riso according to the embodiment of the present invention is shown in the following relationship:
y＝-0.0112x2+9.1459x+1385.4；
where y is the output voltage (unit: mV) of the voltage collecting terminal Vout, and x is the value of insulation resistance Riso (unit: kohm) between the negative electrode GND2 and the ground GND1 of the battery module. When the insulation resistance Riso is megaohm, the power battery is good in insulation condition, and no liquid leakage condition occurs; and if the insulation resistance Riso is in kiloohm level, the power battery is indicated to have liquid leakage.
With continued reference to fig. 2, optionally, in order to protect the capacitor C in the leakage detection circuit 104 from being damaged due to the excessively high voltage of the voltage source Vin, in a preferred embodiment of the present invention, a protection resistor R2 is further connected between the capacitor C and the voltage source Vin, and the problem of damaging the capacitor C due to the excessively high voltage of the voltage source Vin can be avoided by the voltage division effect of the protection resistor R2.
Alternatively, in the embodiment of the invention, the body is used as the ground point GND1, and it should be understood that the ground point GND1 includes any low voltage reference ground, which may be, but is not limited to, the body.
Second embodiment
As shown in fig. 5, an embodiment of the present invention further provides a liquid leakage detection system, where the liquid leakage detection system includes: BMS unit 20, terminal device 30, server 40, and leak detection device 10 described above;
the BMS unit 20 is connected to the leakage detection device 10, and is configured to generate leakage fault information according to the leakage condition detected by the leakage detection device 10;
the BMS unit 20 is further in communication connection with the terminal device 30, and the BMS unit 20 transmits the leakage fault information to the terminal device 30 and uploads the leakage fault information to the server 40 through the terminal device 30 for maintenance by technicians.
The leakage detection device 10 detects the change condition of the insulation resistance Riso between the negative electrode GND2 of the battery module and the ground point GND1 in real time, when the leakage detection device 10 detects that the insulation resistance Riso between the negative electrode GND2 of the battery module and the ground point GND1 is in kiloohm level, the leakage fault is indicated to the battery, then a fault signal is fed back to the BMS unit 20, the BMS unit 20 generates leakage fault information according to the fault signal fed back by the leakage detection device 10 and sends the leakage fault information to the terminal device 30, then the terminal device 30 uploads the leakage fault information to the server 40, and a technician can obtain the leakage fault information of the automobile power battery through the server 40 for the first time, so that the technician can maintain and process in time, and accidents caused by the leakage fault of the power battery are avoided.
The embodiment of the invention also provides an electric vehicle, which comprises a power battery and the liquid leakage detection device 10;
the power battery provides electric power for the electric vehicle;
the leakage detection device 10 is used for detecting whether the power battery has leakage faults or not.
By arranging the liquid leakage detection device 10, the electric vehicle can detect whether the power battery has liquid leakage or not in real time, and the safety of the power battery is greatly improved.
To sum up: the embodiment of the invention provides a liquid leakage detection device, a liquid leakage detection system and an electric vehicle. The leakage detection device is applied to the power battery for leakage detection and comprises an insulating plate body, wherein the insulating plate body is arranged in the battery box body and is positioned below the battery module; the battery box body is provided with a box body through hole, and one end of the metal wire is connected with a grounding point outside the battery box body through the box body through hole; the leakage detection device further comprises a leakage detection circuit, wherein the leakage detection circuit is used for detecting the resistance between the negative electrode of the battery module and the grounding point, and judging whether liquid leakage exists in the battery module or the liquid cooling flat tube or not by detecting the change condition of the insulation resistance between the negative electrode of the battery module and the grounding point in real time, so that short circuit caused by liquid leakage of the power battery is avoided, and the safety of the power battery is improved.
The leakage detection system comprises a BMS unit, terminal equipment, a server and the leakage detection device, wherein the leakage detection device detects the insulation resistance change condition between the negative electrode of the battery module and the grounding point in real time, when the leakage detection device detects a fault signal, the fault signal is fed back to the BMS unit, the BMS unit generates leakage fault information according to the fault signal fed back by the leakage detection device and sends the leakage fault information to the terminal equipment, then the terminal equipment uploads the leakage fault information to the server, and related technicians can obtain automobile fault information through the server at the first time so as to facilitate timely maintenance and treatment of the technicians, further avoid accidents caused by leakage of the power battery, and ensure the safety and personal safety of the automobile.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. The leakage detection device is characterized by being applied to a power battery for leakage detection, wherein the power battery comprises a battery box body, a battery module and a liquid cooling flat tube, the battery module is arranged in the battery box body, and the liquid cooling flat tube is used for carrying out thermal management on the battery module;
the leakage detection device comprises an insulating plate body, wherein the insulating plate body is arranged in the battery box body and is positioned below the battery module;
the battery box body is provided with a box body through hole, and one end of the metal wire is connected with a grounding point outside the battery box body through the box body through hole;
the leakage detection device further comprises a leakage detection circuit, the leakage detection circuit is used for detecting the resistance between the negative electrode of the battery module and the grounding point, judging whether liquid leakage exists in the battery module or the liquid cooling flat tube by detecting the change condition of the insulation resistance between the negative electrode of the battery module and the grounding point, wherein the insulation resistance between the negative electrode of the battery module and the grounding point comprises the resistance between the negative electrode of the battery module and the insulating plate body and the resistance between the metal wire in the insulating plate and the grounding point, and the leakage detection circuit comprises: the first resistor and the capacitor are connected in series between the negative electrode of the battery module and the grounding point, and an RC charge-discharge loop is formed by the first resistor and the capacitor and an insulation resistor between the negative electrode of the battery module and the grounding point;
the leakage detection circuit further comprises a voltage source for charging the capacitor, and the voltage source is electrically connected between the first resistor and the capacitor;
the leakage detection circuit further comprises a voltage acquisition end, wherein the voltage acquisition end is connected between the first resistor and the grounding point and is used for acquiring voltage on an insulation resistor between the negative electrode of the battery module and the grounding point in the RC charge-discharge loop;
the insulating plate body is made of a material capable of absorbing liquid leakage, and the material comprises a mica material; the metal wire is buried in the insulating plate body.
2. The leakage detection device of claim 1, wherein a protection resistor is further connected between the capacitor and the voltage source in the leakage detection circuit.
3. The leakage detection device of claim 1, wherein the battery module comprises a plurality of individual cells, the liquid-cooled flat tube is in contact with the individual cells and at least one layer of liquid-cooled flat tube is disposed between two adjacent layers of individual cells.
4. The liquid leakage detection apparatus of claim 1, wherein the ground point comprises a body metal conductor.
5. A leak detection system, the leak detection system comprising: BMS unit, terminal device, server, and leakage detection apparatus according to any one of claims 1 to 4;
the BMS unit is connected with the leakage detection device and is used for generating leakage fault information according to the leakage condition detected by the leakage detection device;
the BMS unit is also in communication connection with the terminal equipment, and sends the leakage fault information to the terminal equipment, and the leakage fault information is uploaded to the server through the terminal equipment, so that technicians can maintain the leakage fault information.
6. An electric vehicle, characterized in that the electric vehicle comprises a power battery and the leakage detection device according to any one of claims 1-4;
the power battery provides electric power for the electric vehicle;
the leakage detection device is used for detecting whether the power battery has leakage faults or not.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810186472.9A CN108318827B (en) | 2018-03-07 | 2018-03-07 | Liquid leakage detection device, system and electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810186472.9A CN108318827B (en) | 2018-03-07 | 2018-03-07 | Liquid leakage detection device, system and electric vehicle |
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| CN108318827A CN108318827A (en) | 2018-07-24 |
| CN108318827B true CN108318827B (en) | 2023-11-28 |
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