CN113702853A - Vehicle-mounted battery health condition detection device and detection method thereof - Google Patents
Vehicle-mounted battery health condition detection device and detection method thereof Download PDFInfo
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- CN113702853A CN113702853A CN202110795715.0A CN202110795715A CN113702853A CN 113702853 A CN113702853 A CN 113702853A CN 202110795715 A CN202110795715 A CN 202110795715A CN 113702853 A CN113702853 A CN 113702853A
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- 238000001514 detection method Methods 0.000 title claims abstract description 71
- 230000036541 health Effects 0.000 title claims abstract description 33
- 238000007599 discharging Methods 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 6
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 9
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 9
- 238000012544 monitoring process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000003862 health status Effects 0.000 description 6
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- DMBHHRLKUKUOEG-UHFFFAOYSA-N diphenylamine Chemical group C=1C=CC=CC=1NC1=CC=CC=C1 DMBHHRLKUKUOEG-UHFFFAOYSA-N 0.000 description 1
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- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
Abstract
The detection device comprises a battery internal resistance detection module and a controller, wherein a first end of the battery internal resistance detection module is connected with the anode of the battery, and a second end of the battery internal resistance detection module is connected with the power ground; the controller detects the no-load voltage of the battery and the load voltage of the battery when the battery and the battery internal resistance detection module form a passage, and determines the internal resistance of the battery based on the no-load voltage and the load voltage so as to judge the health condition of the battery.
Description
Technical Field
The application relates to the technical field of commercial vehicle batteries, in particular to a vehicle-mounted battery health condition detection device and a detection method thereof.
Background
Commercial car all is provided with vehicle mounted terminal generally, and vehicle mounted terminal is applied to car safe driving control and car networking remote monitoring field, and the primary function has big dipper position control, video monitoring, driver's action control and vehicle scheduling etc. and monitoring information is very important.
Therefore, in order to ensure the integrity of the monitoring information, a battery is arranged in the vehicle-mounted terminal, and a backup function is performed on a power supply, as shown in fig. 1. When the automobile power supply is powered on, the power supply module and the discharging module are both turned on, VCC1 is greater than VCC2, then the controller and the system are powered by the automobile power supply, and VCC1 charges the backup battery. When the automobile power supply is powered off, the voltage VCC1 is less than VCC2, and the backup battery/VBAT supplies power to the system. The battery keeps working, avoids losing data due to sudden disconnection of the automobile power supply, and can continuously execute part of the service process.
Generally, the power failure of the vehicle can be suddenly caused only by unexpected situations, such as traffic accidents, and at this time, the monitoring data of the vehicle-mounted terminal is very important, so that the battery must be ensured to be available at this critical moment, and therefore, the battery must be ready at any time to maintain a good working state.
The battery belongs to the vulnerable part, and the life is limited, if the health condition of the battery can be known in time, the maintenance work can be done in advance, however, in the prior art scheme, the health condition of the battery cannot be accurately judged. Also, the opening and closing of the discharge module is not controlled, affecting battery life.
Disclosure of Invention
The embodiment of the application provides a vehicle-mounted battery health condition detection device, wherein a battery is used as a backup of a vehicle-mounted terminal power supply, the detection device comprises a battery internal resistance detection module and a controller, a first end of the battery internal resistance detection module is connected with an anode of the battery, and a second end of the battery internal resistance detection module is connected with a power ground; the controller detects the no-load voltage of the battery and the load voltage of the battery when the battery and the battery internal resistance detection module form a passage, and determines the internal resistance of the battery based on the no-load voltage and the load voltage so as to judge the health condition of the battery.
According to some embodiments, the controller comprises a voltage detection module for detecting the no-load voltage and the on-load voltage of the battery, a calculation module, and a comparison module; the calculation module is used for determining the internal resistance of the battery based on the no-load voltage and the loaded voltage; the comparison module is used for comparing the ratio of the internal resistance of the battery to the ideal internal resistance of the battery and determining whether the battery fails.
According to some embodiments, the detection device further comprises a power supply module, a charging module and a discharging module, wherein the power supply module is used for supplying power to the vehicle, a first end of the power supply module is connected with a vehicle power supply, and a second end of the power supply module is connected with the controller through a first diode; the charging module is used for charging the battery, a first end of the charging module is connected with a second end of the power supply module, and a second end of the charging module is connected with the anode of the battery; the discharging module is used for supplying power to the vehicle through the battery when the power supply of the vehicle fails, the first end of the discharging module is connected with the controller through the second diode, and the second end of the discharging module is connected with the anode of the battery.
According to some embodiments, the battery internal resistance detection module includes a switch and a resistor connected in series.
According to some embodiments, the switch comprises a first switch tube, a control end of the first switch tube is connected with the controller, and the controller controls the switch to be turned on or off.
According to some embodiments, the battery internal resistance detection module further comprises a second switching tube, a control end of the second switching tube is connected with the controller, a first end of the second switching tube is connected with the positive electrode of the battery, and a second end of the second switching tube is connected with the power ground; the control end of the first switch tube is connected with the first end of the second switch tube, the first end of the first switch tube is connected with the anode of the battery, the second end of the first switch tube is connected with one end of the resistor in series, and the other end of the resistor is grounded.
According to some embodiments, the control terminal of the discharging module is connected to the controller, and the controller controls the discharging module to be turned on or off.
According to some embodiments, the control terminal of the charging module is connected to the controller, and the controller controls the charging module to be turned on or off.
The embodiment of the present application further provides a method for detecting a health status of a battery, including: detecting a first voltage of the battery after the battery is fully charged; detecting a second voltage of the battery after discharging the battery for a preset time; determining an internal resistance of the battery based on the first voltage and the second voltage; and judging the health condition of the battery based on the internal resistance of the battery.
According to some embodiments, said charging said battery comprises: and opening the charging module to fully charge the battery.
According to some embodiments, the discharging the battery for a preset time and then detecting the second voltage of the battery comprises: closing the charging module and the discharging module; and discharging the battery for a preset time through the switch and the resistor of the battery internal resistance detection module, and then detecting a second voltage of the battery.
According to some embodiments, the determining the health of the battery based on the internal resistance of the battery comprises: and the internal resistance of the battery is larger than the ideal internal resistance of the battery by a preset proportion, and the battery is judged to be invalid.
According to some embodiments, the detection method further comprises: communicating with a service platform, and uploading the health condition of the battery to the service platform.
The technical scheme provided by the embodiment of the application has the advantages of simple circuit and low cost, and can judge the health condition of the battery in time and avoid the battery from failing to lose important monitoring information.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a diagram of a backup battery power supply of a vehicle-mounted terminal in the prior art.
Fig. 2 is a schematic diagram of a vehicle-mounted battery health status detection device according to an embodiment of the present application.
Fig. 3 is a schematic diagram of another vehicle-mounted battery health status detection device provided in an embodiment of the present application.
Fig. 4 is a schematic circuit diagram of a battery internal resistance detection module according to an embodiment of the present application.
Fig. 5 is a schematic flow chart of a method for detecting a health condition of a vehicle-mounted battery according to an embodiment of the present application.
Fig. 6 is a schematic flow chart of another vehicle-mounted battery health status detection method provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.
It should be understood that the terms "first", "second", etc. in the claims, description, and drawings of the present application are used for distinguishing between different objects and not for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
Fig. 2 is a schematic diagram of a vehicle-mounted battery health status detection device according to an embodiment of the present application.
The vehicle-mounted battery is used as a backup of a power supply of the vehicle-mounted terminal, the health condition of the battery affects related keys of the running safety of the vehicle, and the detection device for the health condition of the vehicle-mounted battery is arranged so that the health condition of the battery can be mastered in time.
As shown in fig. 2, when the vehicle power supply is powered on, both the power module and the discharge module are turned on, VCC1 is greater than VCC2 voltage, and the vehicle power supply supplies power to the system while VCC1 charges the backup vehicle battery. When the vehicle power supply is powered off, VCC1 is less than VCC2 voltage, and the backup battery supplies power to the system.
The detection device for the health condition of the battery comprises a battery internal resistance detection module and a controller.
The first end of the battery internal resistance detection module is connected with the positive electrode of the battery, and the second end of the battery internal resistance detection module is connected with the power ground. The controller detects the no-load voltage of the battery and the on-load voltage of the battery when the battery and the battery internal resistance detection module form a passage, and determines the internal resistance of the battery based on the no-load voltage and the on-load voltage so as to judge the health condition of the battery.
According to some embodiments, the battery internal resistance detection module includes a switch and a resistor connected in series.
Specifically, a detection method of the vehicle-mounted battery state of health detection device of the present embodiment is shown in fig. 3.
In S110, the controller detects the no-load voltage V1 when the battery is fully charged.
In S120, the controller controls the switch of the battery internal resistance detection module to be turned on, and after discharging the battery for a preset time, the controller detects the on-load voltage V2 of the battery.
In S130, the internal resistance of the battery is determined based on the no-load voltage U1 and the loaded voltage U2.
I＝V2/R
V1＝r1×I+r2×I+R×I
r1＝(V1–r2×I-R×I)/I。
Where V1 represents the no-load voltage of the battery, V2 represents the on-load voltage of the battery when the switch Q1 is turned on, I represents the current, R represents the resistance value of the resistor R1, R1 represents the internal resistance of the battery, and R2 represents the internal resistance of the switch Q1.
In S140, the internal resistance of the battery is compared with the ideal resistance of the battery to determine the health condition of the battery.
The internal resistance of the battery is larger than the ideal internal resistance of the battery by a preset proportion, and the battery is judged to be invalid. The predetermined ratio is generally 100%, but not limited thereto.
The technical scheme provided by the embodiment of the application has the advantages of simple circuit and low cost, and can judge the health condition of the battery in time and avoid the battery from failing to lose important monitoring information.
Fig. 4 is a schematic diagram of another vehicle-mounted battery health status detection device provided in the embodiment of the present application.
As shown in fig. 4, the device for detecting the health condition of the vehicle-mounted battery includes a power supply module, a charging module, a discharging module, a controller, and a battery internal resistance detection module.
The power module is used for supplying power to the vehicle, and the first end of the power module is connected with a vehicle power supply. The controller is used for controlling the vehicle, and a first end of the controller is connected with a second end of the power supply module through a first diode to obtain electric energy. The charging module is used for charging the battery, the first end of the charging module is connected with the second end of the power supply module, and the second end of the charging module is connected with the anode of the battery. The discharging module is used for supplying power to the vehicle through the battery when the power supply of the vehicle fails, the first end of the discharging module is connected with the controller through the second diode, and the second end of the discharging module is connected with the anode of the battery.
The first end of the battery internal resistance detection module is connected with the positive electrode of the battery, and the second end of the battery internal resistance detection module is connected with the power ground. The controller detects the no-load voltage of the battery and the on-load voltage of the battery when the battery and the battery internal resistance detection module form a passage, and determines the internal resistance of the battery based on the no-load voltage and the on-load voltage so as to judge the health condition of the battery.
When the vehicle power supply is powered on, the power supply module and the discharging module are both turned on, VCC1 is greater than VCC2 voltage, the vehicle power supply supplies power to the system, and VCC1 charges the backup battery. When the vehicle power supply is powered off, VCC1 is less than VCC2 voltage, and the backup battery supplies power to the system.
According to some embodiments, the battery internal resistance detection module includes a first switch Q1 and a resistor R connected in series, and a second switch N1, as shown in fig. 5.
The control terminal of the second switch N1 is connected to the controller through a resistor R5. The resistor R6 is connected between the control terminal of the second switch N1 and power ground. The second end of the second switch N1 is connected to the ground, and the first end of the second switch N1 is connected to the positive electrode of the battery through a resistor R3. A first terminal of the second switch N1 is connected to a control terminal of the first switch Q1 through a resistor R4, a first terminal of the first switch is connected to the positive electrode VBAT of the battery, a second terminal of the first switch is connected in series with the resistor R1, and the other terminal of the resistor R1 is connected to the power ground.
According to some embodiments, a controller includes a voltage detection module, a calculation module, and a comparison module.
The voltage detection module is used for detecting the no-load voltage and the on-load voltage of the battery. The calculation module is used for determining the internal resistance of the battery based on the no-load voltage and the on-load voltage. The comparison module is used for comparing the ratio of the internal resistance of the battery to the ideal internal resistance of the battery and determining whether the battery fails.
Specifically, the control end of the discharging module is connected with the controller, and the controller controls the on or off of the discharging module. The control end of the charging module is connected with the controller, and the controller controls the on/off of the charging module. The detection method of the detection device of the vehicle-mounted battery state of health of the present embodiment is shown in fig. 6.
In S210, the controller turns on the charging module, fully charges the battery through the power module, and the detection module of the controller detects the no-load voltage V1 of the battery.
In S220, the controller turns off the charging module and the discharging module, turns on the switch of the battery internal resistance detection module, and after discharging the battery for a preset time through the switch and the resistor of the battery internal resistance detection module, the detection module of the controller detects the on-load voltage V2 of the battery.
In S230, the calculation module of the controller determines the internal resistance of the battery based on the no-load voltage U1 and the on-load voltage U2.
I＝V2/R
V1＝r1×I+r2×I+R×I
r1＝(V1–r2×I-R×I)/I。
Where V1 represents the no-load voltage of the battery, V2 represents the on-load voltage of the battery when the switch Q1 is turned on, I represents the current, R represents the resistance value of the resistor R1, R1 represents the internal resistance of the battery, and R2 represents the internal resistance of the switch Q1.
In S240, the comparing module of the controller compares the internal resistance of the battery with the ideal resistance of the battery to determine the health condition of the battery.
The internal resistance of the battery is larger than the ideal internal resistance of the battery by a preset proportion, and the battery is judged to be invalid. The predetermined ratio is generally 100%, but not limited thereto.
Optionally, the controller is further in communication with the service platform for uploading the health condition of the battery to the service platform.
The technical scheme provided by the embodiment of the application has the advantages that the control function of the controller is added, the circuit is simple, the cost is low, the health condition of the battery can be judged in time, the battery is prevented from being failed and important monitoring information is lost, the controllability of the circuit is enhanced, the charging module and the discharging module are opened as required, and the service life of the battery is prolonged.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.
Claims (13)
1. An in-vehicle battery state of health detection device, the battery is used as the backup of the in-vehicle terminal power, the detection device includes:
the first end of the battery internal resistance detection module is connected with the anode of the battery, and the second end of the battery internal resistance detection module is connected with the power ground;
and the controller is used for detecting the no-load voltage of the battery and the loaded voltage of the battery when the battery and the battery internal resistance detection module form a passage, and determining the internal resistance of the battery based on the no-load voltage and the loaded voltage so as to judge the health condition of the battery.
2. The detection apparatus of claim 1, wherein the controller comprises:
a voltage detection module for detecting the no-load voltage and the on-load voltage of the battery;
a calculation module for determining an internal resistance of the battery based on the no-load voltage and the on-load voltage;
and the comparison module is used for comparing the ratio of the internal resistance of the battery to the ideal internal resistance of the battery and determining whether the battery fails.
3. The detection apparatus of claim 1, further comprising:
the power supply module is used for supplying power to a vehicle, a first end of the power supply module is connected with a vehicle power supply, and a second end of the power supply module is connected with the controller through a first diode;
the charging module is used for charging the battery, a first end of the charging module is connected with a second end of the power supply module, and a second end of the charging module is connected with the anode of the battery;
and the discharging module is used for supplying power to the vehicle through the battery when the power supply of the vehicle fails, the first end of the discharging module is connected with the controller through a second diode, and the second end of the discharging module is connected with the anode of the battery.
4. The detection apparatus of claim 1, wherein the battery internal resistance detection module comprises a switch and a resistor connected in series.
5. The detection device according to claim 4, wherein the switch comprises a first switch tube, a control end of the first switch tube is connected to the controller, and the controller controls the switch to be turned on or off.
6. The detection device according to claim 4, wherein the battery internal resistance detection module further comprises:
a control end of the second switching tube is connected with the controller, a first end of the second switching tube is connected with the anode of the battery, and a second end of the second switching tube is connected with the power ground;
the control end of the first switch tube is connected with the first end of the second switch tube, the first end of the first switch tube is connected with the anode of the battery, the second end of the first switch tube is connected with one end of the resistor in series, and the other end of the resistor is grounded.
7. The detection device of claim 1, wherein a control terminal of the discharging module is connected to the controller, and the controller controls the discharging module to be turned on or off.
8. The detection device according to claim 1, wherein a control terminal of the charging module is connected to the controller, and the controller controls the charging module to be turned on or off.
9. A method of detecting battery health, comprising:
detecting a first voltage of the battery after the battery is fully charged;
detecting a second voltage of the battery after discharging the battery for a preset time;
determining an internal resistance of the battery based on the first voltage and the second voltage;
and judging the health condition of the battery based on the internal resistance of the battery.
10. The detection method of claim 9, wherein said charging the battery comprises:
and opening the charging module to fully charge the battery.
11. The method for detecting according to claim 9, wherein detecting the second voltage of the battery after discharging the battery for a preset time comprises:
closing the charging module and the discharging module;
and discharging the battery for a preset time through the switch and the resistor of the battery internal resistance detection module, and then detecting a second voltage of the battery.
12. The detection method of claim 9, wherein said determining the state of health of the battery based on the internal resistance of the battery comprises:
and the internal resistance of the battery is larger than the ideal internal resistance of the battery by a preset proportion, and the battery is judged to be invalid.
13. The detection method of claim 9, further comprising:
communicating with a service platform, and uploading the health condition of the battery to the service platform.
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| CN202110795715.0A CN113702853A (en) | 2021-07-14 | 2021-07-14 | Vehicle-mounted battery health condition detection device and detection method thereof |
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| CN202110795715.0A CN113702853A (en) | 2021-07-14 | 2021-07-14 | Vehicle-mounted battery health condition detection device and detection method thereof |
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