CN111781526B - Method and device for detecting vehicle battery and battery detection equipment - Google Patents
Method and device for detecting vehicle battery and battery detection equipment Download PDFInfo
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- CN111781526B CN111781526B CN202010675825.9A CN202010675825A CN111781526B CN 111781526 B CN111781526 B CN 111781526B CN 202010675825 A CN202010675825 A CN 202010675825A CN 111781526 B CN111781526 B CN 111781526B
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/386—Arrangements for measuring battery or accumulator variables using test-loads
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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
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Abstract
The invention relates to the field of automotive electronics, and discloses a method and a device for detecting a vehicle battery and battery detection equipment. The method is applied to the battery detection equipment, and comprises the following steps: acquiring a noise relation table for a vehicle battery; applying a load to a vehicle battery; acquiring a first total current after a load is applied to a vehicle battery, and a load current and a load voltage; calculating real load voltage according to the first total current, the load current and the load voltage and by combining a noise relation table; acquiring an open-circuit voltage of a vehicle battery; and calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the load current. The noise relation table for the vehicle battery is obtained in advance, the real load voltage is calculated by using the noise relation table, and the internal resistance of the battery is accurately calculated by combining the open-circuit voltage and the load current so as to accurately judge the health degree of the battery according to the internal resistance of the battery.
Description
Technical Field
The invention relates to the technical field of automotive electronics, in particular to a method and a device for detecting a vehicle battery and battery detection equipment.
Background
Modern science and technology develops more and more fast, the electronic equipment on the car is more and more, also more and more high to car battery ability requirement, it can normally start the car not only to require it, still need can provide sufficient electric power support for the electrical apparatus on the car in some specific scenes, if the car uses unhealthy battery for a long time, will lead to serious consequence, consequently, need carry out periodic maintenance test to the car battery, in order to judge whether the car battery is healthy or can satisfy the user demand, if unhealthy or can not satisfy the user demand, then need in time to change the car battery.
For judging whether the automobile battery is healthy or not, the traditional battery detection scheme generally detects the internal resistance of a resistor through a battery detector, and then judges whether the automobile battery is healthy or not according to the internal resistance of the resistor: firstly, applying a load to a battery, measuring load voltage and current generated after the load is applied, then releasing the load, measuring battery open-circuit voltage, and calculating the internal resistance of the battery by a formula of battery internal resistance (open-circuit voltage-load voltage)/current.
However, in the process of implementing the present invention, the inventors found that the existing battery detection scheme has at least the following technical problems: in the battery detection process, no matter a load is applied to the battery or the load is released, the automobile electronic equipment consumes current, the consumed current feeds back corresponding voltage to the battery detection equipment, and the fed-back voltage is uncertain, which can generate great interference on the detection result of the open-circuit voltage or the load voltage, so that the detection value of the open-circuit voltage or the load voltage deviates from the true value, and the detection of the internal resistance of the battery is not accurate enough.
Disclosure of Invention
In order to solve the technical problems, embodiments of the present invention provide a method and an apparatus for detecting a vehicle battery, and a battery detection device, which can solve the technical problem in the prior art that detection is not accurate due to noise interference during battery detection.
The embodiment of the invention provides the following technical scheme for solving the technical problems:
in a first aspect, an embodiment of the present invention provides a method for detecting a vehicle battery, the method being applied to a battery detection apparatus, the battery detection apparatus including a current detection device, the battery detection apparatus being connected to the vehicle battery through a kelvin connector, the current detection device being connected to a negative electrode of the vehicle battery, the method including: obtaining a noise relationship table for the vehicle battery, wherein the noise relationship table comprises a correspondence between noise current and noise voltage; applying a load to the vehicle battery; acquiring a first total current after a load is applied to the vehicle battery, and a load current and a load voltage; calculating a real load voltage according to the first total current, the load current and the load voltage and by combining the noise relation table; acquiring an open circuit voltage of the vehicle battery; and calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the load current.
Optionally, the applying a load to the vehicle battery comprises: applying a load of a preset magnitude to the vehicle battery within a preset duration; the step of obtaining a first total current after the load is applied to the vehicle battery, and a load current and a load voltage further includes: respectively collecting the total current, the load current and the load voltage after the load is applied within the preset time interval to obtain a plurality of groups of the total current, the load current and the load voltage after the load is applied; and respectively calculating the average values of the total current, the load current and the load voltage after the load is applied to obtain the first total current, the load current and the load voltage.
Optionally, the step of obtaining the open-circuit voltage of the vehicle battery further includes: acquiring a second total current after releasing the load applied to the vehicle battery, and a no-load current and a no-load voltage; acquiring the open-circuit voltage according to the second total current, the no-load current and the no-load voltage and by combining the noise relation table; the step of calculating the internal resistance of the vehicle battery based on the true load voltage, the open circuit voltage, and the load current further includes: calculating a real load current according to the load current and the no-load current; and calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the real load current. The step of obtaining a second total current after releasing the load applied to the vehicle battery, and a no-load current and a no-load voltage further includes: after releasing the load applied to the vehicle battery, collecting the total current, the no-load current and the no-load voltage after releasing the load at a preset time interval to obtain a plurality of groups of total current, no-load current and no-load voltage after releasing the load; and respectively calculating the average values of the total current, the no-load current and the no-load voltage after the load is released to obtain the second total current, the no-load current and the no-load voltage.
Optionally, the step of obtaining the open-circuit voltage according to the second total current, the idle current, and the idle voltage and by combining the noise relation table further includes: calculating a first current difference value of the second total current and the no-load current; acquiring a first noise voltage corresponding to the first current difference value according to a noise relation table; and subtracting the first noise voltage from the no-load voltage to obtain the open-circuit voltage.
Optionally, the step of obtaining the open-circuit voltage of the vehicle battery further includes: acquiring a bias voltage of the battery detection equipment; and acquiring the open-circuit voltage according to the bias voltage.
Optionally, the step of calculating a real load voltage according to the first total current, the load current, and the load voltage and by combining the noise relation table further includes: calculating a second current difference value of the first total current and the load current; acquiring a second noise voltage corresponding to the second current difference value according to the noise relation table; and subtracting the second noise voltage from the load voltage to obtain the real load voltage.
Optionally, the step of obtaining a noise relationship table for the vehicle battery further includes: under the condition that no load is applied to the vehicle battery, collecting noise current and noise voltage of the vehicle battery at preset time intervals within a preset time length to obtain multiple groups of noise current and noise voltage of the vehicle battery; and constructing a corresponding relation between a plurality of groups of noise currents and noise voltages to obtain the noise relation table.
Optionally, the method further comprises: determining a CCA value of the vehicle battery according to the internal resistance of the vehicle battery; detecting a state of health of the vehicle battery according to at least one of the open circuit voltage, the internal resistance, and the CCA value.
In a second aspect, an embodiment of the present invention provides an apparatus for detecting a vehicle battery, including: a first obtaining module configured to obtain a noise relationship table for the vehicle battery, wherein the noise relationship table includes a correspondence between a noise current and a noise current; a loading module for applying a load to the vehicle battery; the second acquisition module is used for acquiring a first total current after a load is applied to the vehicle battery, and the load current and the load voltage; the first calculation module is used for calculating real load voltage according to the first total current, the load current and the load voltage and by combining the noise relation table; a second acquisition module for acquiring an open circuit voltage of the vehicle battery; and the second calculation module is used for calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the load current.
In a third aspect, embodiments of the present invention provide a battery test apparatus, a battery test module for connecting with a vehicle battery through a kelvin connector; a load regulation module for applying a load to the vehicle battery; the current detection module is used for being connected with the negative electrode of the vehicle battery; a control module connected to the battery detection module, the load adjustment module and the current detection module, respectively, the control module including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method as described above.
In a third aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer-executable instructions that, when executed by an electronic device, cause the electronic device to perform the method described above.
The embodiment of the invention has the beneficial effects that: the method and the device for detecting the vehicle battery and the battery detection equipment are different from the prior art. The method is applied to the battery detection equipment and comprises the following steps: acquiring a noise relation table for a vehicle battery; applying a load to a vehicle battery; acquiring a first total current after a load is applied to a vehicle battery, and a load current and a load voltage; calculating real load voltage according to the first total current, the load current and the load voltage and by combining a noise relation table; acquiring an open-circuit voltage of a vehicle battery; and calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the load current. The noise relation table for the vehicle battery is obtained in advance, the real load voltage is calculated by using the noise relation table, and the internal resistance of the battery is accurately calculated by combining the open-circuit voltage and the load current so as to accurately judge the health degree of the battery according to the internal resistance of the battery.
Drawings
The embodiments are illustrated by way of example only in the accompanying drawings, which are not to be construed as limiting the embodiments, in which elements having the same reference numerals are identified as similar elements, and in which the figures are not to be limited except where specifically noted.
Fig. 1 is a schematic structural diagram of a battery detection device according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram of a method for testing a vehicle battery according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of S10 in FIG. 2;
FIG. 4 is a schematic flow chart of S30 in FIG. 2;
FIG. 5 is a schematic flow chart of S40 in FIG. 2;
FIG. 6 is a schematic flow chart of S50 in FIG. 2;
FIG. 7 is another schematic flow chart of S50 of FIG. 2;
FIG. 8 is a schematic flow chart of S53 in FIG. 7;
FIG. 9 is a schematic flow chart of S54 in FIG. 7;
FIG. 10 is a schematic flow chart of S60 in FIG. 2;
FIG. 11 is a schematic flow chart diagram illustrating a method for testing a vehicle battery according to another embodiment of the present invention;
FIG. 12 is a schematic structural diagram of an apparatus for testing a vehicle battery according to an embodiment of the present invention;
fig. 13 is a schematic structural view of an apparatus for inspecting a vehicle battery according to another embodiment of the present invention;
fig. 14 is a schematic diagram of a control module of fig. 1.
Detailed Description
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
Through a large number of experiments: the internal resistance value of the storage battery increases along with the reduction of the capacity of the storage battery, namely, the internal resistance value of the storage battery continuously increases when the capacity of the storage battery continuously decreases due to the continuous aging of the storage battery. Therefore, the internal resistance change degree of the storage battery is determined by detecting the internal resistance value of the storage battery, and the internal resistance change degree can reflect the aging degree or the health state of the storage battery so as to replace unhealthy storage batteries or bad batteries in time. One key point of accurately determining the health state of the storage battery and avoiding mistakenly considering a good battery as a bad battery or mistakenly considering a bad battery as a good battery is to accurately detect the internal resistance of the storage battery.
Based on this, the embodiment of the present invention provides a method for detecting a vehicle battery, which is applied to a battery detection device, and the method calculates a real load voltage by using a noise relation table obtained in advance for the vehicle battery, and then accurately calculates an internal resistance of the vehicle battery by combining an open-circuit voltage and a load current, that is, the internal resistance value obtained by the last calculation is the value that eliminates the noise of the vehicle battery, that is, the calculated internal resistance value can be used as the vehicle battery in real time and is the real internal resistance value.
Therefore, the embodiment of the invention can improve the accuracy of vehicle battery detection.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery detection apparatus according to an embodiment of the present invention. The battery test apparatus 100 can test the vehicle battery 200, and as shown in fig. 1, the battery test apparatus 100 includes: battery detection module 11, load regulation module 12, current detection module 13 and control module 14.
The battery detection module 11 is connected to the vehicle battery 200 through a kelvin connector, and the kelvin connector includes four connection lines, which are a B + connection line, a B-connection line, an S + connection line, and an S-connection line, respectively, where the B + connection line and the S + connection line are both electrically connected to a positive electrode of the battery 200, the B-connection line and the S-connection line are both electrically connected to a negative electrode of the battery 200, the B + connection line and the B-connection line are used to separate a discharge current between two electrodes of the battery 200, and the S + connection line and the S-connection line are used to separate an open-circuit voltage between two electrodes of the battery 200.
When a load is applied to the battery 200, the battery detection module 11 may detect a load current and a load voltage, where the load current is a current value actually measured by the battery 200 during discharging, and the load voltage is a voltage at two ends of the positive electrode and the negative electrode of the battery 200 detected by the S + connection line and the S-connection line during discharging the battery 200. When no load is applied to the battery 200, that is, when no load exists, the battery detection module 11 may detect an idle current and an idle voltage, where the idle current is an actually measured current value of the battery 200 without a load, and the idle voltage is a voltage at both ends of the positive electrode and the negative electrode of the battery 200 without a load.
The load adjusting module 12 is used to apply a load to the battery 200, and generally, when the battery detection module 11 and the battery 200 form a discharge circuit, the load adjusting module 12 applies a different load to the battery 200, and a different current is generated by the discharge circuit.
The current detection module 13 is connected to the negative electrode of the battery 200, and is configured to detect a total current value of the battery 200, where the total current value of the battery 200 is not fixed but can be changed according to different situations, for example, when the battery 200 is unloaded and different loads are applied to the battery, the total current value of the battery 200 is different.
In some embodiments, the current detection module 13 may be a device or an instrument independent from the battery detection apparatus 100, and the current detection module 13 is connected to the battery detection apparatus 100 and the battery 200, for example, the current detection module 13 is a current clamp, and the current clamp is clamped at a negative electrode of the battery 200 to detect a total current value of the battery 200, so that the battery detection apparatus 100 can obtain the total current data, wherein the current clamp is a clamp current meter.
The control module 14 is connected to the battery detection module 11, the load adjustment module 12, and the current detection module 13. On one hand, the control module 14 may control the load adjusting module 12 according to the loading instruction, so that the load adjusting module 12 applies loads of different sizes to the battery 200, or does not apply a load to the battery 200, and on the other hand, the control module 14 may obtain a noise relation table of the battery 200, obtain a first total current after applying a load to the battery 200, and a load current and a load voltage, calculate a real load voltage according to the first total current, the load current and the load voltage, and combine the noise relation table, then obtain an open circuit voltage of the battery 200, and then calculate an internal resistance of the battery 200 according to the real load voltage, the open circuit voltage and the load current.
Therefore, the embodiment of the present invention provides a battery detection apparatus 100, which can accurately calculate the internal resistance of the battery 200 when detecting the battery 200, so as to accurately judge the health degree of the battery 200 according to the internal resistance of the battery 200.
Example two
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for detecting a vehicle battery according to an embodiment of the invention. As shown in fig. 2, the method comprises the steps of:
s10, acquiring a noise relation table for the vehicle battery, wherein the noise relation table comprises a corresponding relation between noise current and noise voltage;
the noise relationship table is obtained before the vehicle battery is detected to acquire the respective parameters by which the internal resistance of the battery 200 can be calculated, that is, the noise relationship table is obtained and the vehicle battery is subsequently detected based on the same vehicle battery, and therefore, it is possible to simulate the same noise environment. It can be understood that, because some electronic devices on the vehicle may also get power from the battery 200 even when the vehicle is turned off, that is, may consume the current of the battery 200, and the current consumed by the electronic devices is the noise current, at this time, the noise current may feed back the corresponding noise voltage to the battery detection module 11 through the detection signal line, and different noise currents correspond to different noise voltages.
In some embodiments, as shown in fig. 3, S10 includes:
s11, under the condition that no load is applied to the vehicle battery, collecting the noise current and the noise voltage of the vehicle battery at preset time intervals within preset time length to obtain multiple groups of noise current and noise voltage of the vehicle battery;
for example, within a period of time of more than 100ms and less than 10s, the noise current and the corresponding noise voltage are collected at a time interval of 100us to obtain multiple sets of noise currents and noise voltages of the vehicle battery, and the preset time interval and the collected time interval can be programmed and set according to actual requirements.
And S12, constructing a corresponding relation between a plurality of groups of noise currents and noise voltages to obtain a noise relation table.
The noise relation table includes a plurality of sets of noise currents and noise voltages having a corresponding relation with the noise currents, for example, the noise currents and the noise voltages are collected at the same time at a first collection point to obtain a first noise current and a first noise voltage, and the noise currents and the noise voltages are collected at the same time at a second collection point to obtain a second noise current and a second noise voltage … ….
S20, applying load to the vehicle battery;
in the present embodiment, a load of a preset magnitude is applied to the vehicle battery for a preset duration, for example, a load of 0.4 ohm is continuously applied to the vehicle battery for a duration of 3-100ms, and both the preset duration and the magnitude of the applied load may be determined according to the actual detection requirement of the user.
S30, acquiring a first total current after a load is applied to a vehicle battery, and a load current and a load voltage;
specifically, as shown in fig. 4, S30 includes:
s31, collecting the total current, the load current and the load voltage after the load is applied at preset time intervals in the preset time length to obtain the total current, the load current and the load voltage after the load is applied to the vehicle batteries in multiple groups;
for example, within the preset time duration, a period of time is intercepted, and the total current, the load current and the load voltage are respectively collected at a preset time interval, that is, at a certain sampling rate, within the period of time, so as to obtain multiple groups of total current, load current and load voltage.
And S32, respectively calculating the average value of the total current, the load current and the load voltage after the load is applied to obtain a first total current, a first load current and a first load voltage.
The average value of the plurality of total currents is determined as a first total current, the average value of the plurality of load currents is determined as a load current, and the average value of the plurality of load voltages is determined as a load voltage by averaging the plurality of total currents, the load current, and the load voltage, respectively.
S40, calculating a real load voltage according to the first total current, the load current and the load voltage and by combining a noise relation table;
specifically, as shown in fig. 5, S40 includes:
s41, calculating a second current difference value of the first total current and the load current;
s42, acquiring a second noise voltage corresponding to the second current difference value according to the noise relation table;
the second current difference is a noise current when a preset load is applied to the vehicle battery, and after the second current difference is calculated, a noise voltage corresponding to the second current difference can be determined by inquiring the noise relation table, wherein the noise voltage is the second noise voltage.
S43, subtracting the second noise voltage from the load voltage to obtain a real load voltage;
the real load voltage is the load voltage from which the corresponding noise voltage is removed.
It can be understood that, since, in S31, in the obtained multiple sets of total current, load current and load voltage, there is a corresponding relationship between the total current, load current and load voltage of each set, the method for obtaining the true load voltage may be: subtracting the corresponding load current from the first total currents to obtain a plurality of current difference values, searching a noise relation table to find noise voltages corresponding to the current difference values, subtracting the corresponding noise voltages from the load voltages to obtain a plurality of voltage difference values, and averaging the voltage difference values to obtain the real load voltage.
S50, acquiring the open-circuit voltage of the vehicle battery;
and S60, calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the load current.
After the true load voltage, open circuit voltage and load current are obtained, according to the formula: the internal resistance R is (true load voltage-open circuit voltage)/load current, and generally, the value of the open circuit voltage is relatively close to the value of the bias voltage, so the value of the bias voltage can be substituted into the open circuit voltage in the formula, the internal resistance of the vehicle battery can be calculated in such a way that, on the one hand, since the true load voltage is the load voltage from which the noise voltage is removed, that is, the calculation result of the internal resistance is not affected by the noise voltage, as described above, the calculated internal resistance can reflect the true internal resistance of the vehicle battery, thereby improving the accuracy of vehicle battery detection and more accurately judging the health degree of the vehicle battery, on the other hand, because the vehicle battery does not need to be detected in the no-load state, the method is favorable for saving the battery detection time and can greatly improve the battery detection efficiency.
In some embodiments, as shown in fig. 6, S50 includes:
s51, acquiring the bias voltage of the battery detection device 100;
the bias voltage is written by calibration before the battery test apparatus 100 is shipped.
And S52, acquiring an open-circuit voltage according to the bias voltage.
The open circuit voltage is determined by the bias voltage.
In fig. 6, the open-circuit voltage is determined according to the bias voltage, and the bias voltage is a relatively fixed value, which does not truly reflect the open-circuit voltage of the vehicle battery at different stages, so that the vehicle battery can be further detected in the no-load state to obtain a more accurate open-circuit voltage, thereby further improving the accuracy of the calculation of the internal resistance of the battery. Referring to fig. 7, fig. 7 is another schematic flow chart of S50 in fig. 2. As shown in fig. 7, S50 includes:
s53, acquiring a second total current after the load applied to the vehicle battery is released, and a no-load current and a no-load voltage;
specifically, as shown in fig. 8, S53 includes:
s531, after releasing a load applied to a vehicle battery, collecting the total current, the no-load current and the no-load voltage after releasing the load at preset time intervals to obtain multiple groups of the total current, the no-load current and the no-load voltage after releasing the load;
after releasing the load applied to the vehicle battery, selecting a period of time, and collecting the total current, the load current and the load voltage at a certain sampling rate at a preset time interval, for example, 100ms as the time interval, so as to obtain multiple groups of total current, no-load current and no-load voltage.
And S532, respectively calculating the average values of the total current, the no-load current and the no-load voltage after the load is released to obtain a second total current, a no-load current and a no-load voltage.
The average value of the multiple total currents is determined as a first total current, the average value of the multiple no-load currents is determined as an no-load current, and the average value of the multiple no-load voltages is determined as an no-load voltage.
And S54, acquiring the open-circuit voltage according to the second total current, the no-load current and the no-load voltage and by combining a noise relation table.
Specifically, as shown in fig. 9, S54 includes:
s541, calculating a first current difference value between the second total current and the no-load current;
s542, acquiring a first noise voltage corresponding to the first current difference value according to the noise relation table;
the first current difference is the noise current after releasing the load applied to the vehicle battery, namely, when the vehicle is in no load, the noise voltage corresponding to the first current difference can be determined by inquiring the noise relation table after the first current difference is calculated, and the noise voltage is the first noise voltage.
And S543, subtracting the first noise voltage from the no-load voltage to obtain an open-circuit voltage.
The open circuit voltage is the no-load voltage after the corresponding noise voltage is removed.
It can be understood that, in S531, in the obtained multiple sets of total current, no-load current, and no-load voltage, the total current, no-load current, and no-load voltage of each set have a corresponding relationship, and therefore, the method for obtaining the open-circuit voltage may be: subtracting the corresponding load current from the second total currents to obtain a plurality of current difference values, searching a noise relation table to find noise voltages corresponding to the current difference values, subtracting the corresponding noise voltages from the no-load voltages to obtain a plurality of voltage difference values, and averaging the voltage difference values to obtain the open-circuit voltage.
After the open circuit voltage is obtained, as shown in fig. 10, S60 further includes:
s61, calculating the real load current according to the load current and the no-load current;
the true load current is determined as the difference between the load current and the no-load current.
And S62, calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the real load current.
After the true load voltage, the open circuit voltage and the true load current are obtained, according to the formula: when R is (real load voltage — open circuit voltage)/real load current, the internal resistance of the vehicle battery can be calculated. It is understood that the real load voltage in the formula may be an average value of a plurality of voltage difference values obtained by subtracting a plurality of corresponding noise voltages from a plurality of obtained load voltages, the open-circuit voltage may be an average value of a plurality of voltage difference values obtained by subtracting a plurality of corresponding noise voltages from a plurality of obtained no-load voltages, and the real load current may be a current difference value obtained by subtracting an average value of a plurality of obtained no-load currents from an average value of a plurality of obtained load currents.
Since the real load voltage and the open-circuit voltage used for calculating the internal resistance of the vehicle battery are both removed from the corresponding noise voltage, the technical problem that the detection result is not accurate enough due to the influence of noise in the process of detecting the vehicle battery by the battery detection equipment 100 can be avoided, and therefore the accuracy of battery detection can be improved.
In some embodiments, please refer to fig. 11, fig. 11 is a flowchart illustrating a method for detecting a vehicle battery according to another embodiment of the present invention. The present embodiment is different from the above embodiments in that the method further includes:
s70, determining a CCA value of the vehicle battery according to the internal resistance of the vehicle battery;
as known to those skilled in the art, the CCA value has a certain proportionality coefficient α with the internal resistance R, i.e., CCA α R, so that the CCA value and the CCA percentage can be obtained.
And S80, determining the health state of the vehicle battery according to at least one of the open-circuit voltage, the internal resistance and the CCA value.
For example, the state of health of the vehicle battery may be determined from the CCA value. When the CCA value is larger than 80% of the nominal CCA, the health of the vehicle battery is determined, when the CCA value is 73% to 80% of the nominal CCA, the vehicle battery is determined to be in a critical uncertain state, and when the CCA value is smaller than 73% of the nominal CCA, the battery is determined to be damaged.
EXAMPLE III
Referring to fig. 12, fig. 12 is a schematic structural diagram of an apparatus for detecting a vehicle battery according to an embodiment of the present invention. As shown in fig. 12, the apparatus 120 includes: a first obtaining module 121, a loading module 122, a second obtaining module 123, a first calculating module 124, a third obtaining module 125, and a second calculating module 126. The first obtaining module 121 is configured to obtain a noise relation table for a vehicle battery, where the noise relation table includes a correspondence between a noise current and a noise current; the loading module 122 is configured to apply a load to a vehicle battery, the second obtaining module 123 is configured to obtain a first total current after the load is applied to the vehicle battery, and a load current and a load voltage, the first calculating module 124 is configured to calculate a real load voltage according to the first total current, the load current and the load voltage and in combination with a noise relation table, the third obtaining module 125 is configured to obtain an open-circuit voltage of the vehicle battery, and the second calculating module 126 is configured to calculate an internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the load current.
The apparatus 120 further includes a first determination module 127 and a second determination module 128, the first determination module 127 determining a CCA value of the vehicle battery based on an internal resistance of the vehicle battery, the second determination module 128 determining a state of health of the vehicle battery based on at least one of an open circuit voltage, the internal resistance, and the CCA value.
The first obtaining module 121 is specifically configured to, under the condition that no load is applied to the vehicle battery, collect noise current and noise voltage of the vehicle battery at preset time intervals within a preset time duration to obtain multiple groups of noise current and noise voltage of the vehicle battery, construct a corresponding relationship between the multiple groups of noise current and noise voltage, and obtain a noise relationship table.
The second obtaining module 123 is specifically configured to collect the total current, the load current, and the load voltage after the load is applied at preset time intervals within a preset time duration, so as to obtain multiple groups of total current, load current, and load voltage after the load is applied, and calculate average values of the multiple groups of total current, load current, and load voltage after the load is applied, respectively, so as to obtain the first total current, load current, and load voltage.
The first calculating module 124 is specifically configured to calculate a second current difference between the first total current and the load current, obtain a second noise voltage corresponding to the second current difference according to the noise relation table, and subtract the second noise voltage from the load voltage to obtain a real load voltage.
In some embodiments, the third obtaining module 125 includes a first obtaining unit 1251 and a second obtaining unit 1252, the first obtaining unit 1251 is configured to obtain the second total current after releasing the load applied to the vehicle battery, and the no-load current and the no-load voltage, and the second obtaining unit 1252 is configured to obtain the open-circuit voltage according to the second total current, the no-load current and the no-load voltage, and by combining with the noise relation table.
Further, the second calculating module 126 is specifically configured to calculate a real load current according to the load current and the no-load current, and calculate an internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage, and the real load current.
In some embodiments, the first obtaining unit 1251 is specifically configured to, after releasing a load applied to a vehicle battery, collect total current, no-load current, and no-load voltage after releasing the load at preset time intervals to obtain multiple groups of total current, no-load current, and no-load voltage after releasing the load, and calculate average values of the multiple groups of total current, no-load current, and no-load voltage after releasing the load, respectively, to obtain the second total current, no-load current, and no-load voltage.
In some embodiments, the second obtaining unit 1252 is specifically configured to calculate a first current difference between the second total current and the idle current, obtain a first noise voltage corresponding to the first current difference according to the noise relation table, and subtract the first noise voltage from the idle voltage to obtain the open-circuit voltage.
In some embodiments, as shown in fig. 13, the third obtaining module 125 includes a third obtaining unit 1253 and a fourth obtaining unit 1254, the third obtaining unit 1253 is configured to obtain the bias voltage of the battery detection apparatus 100, and the fourth obtaining unit 1254 is configured to obtain the open-circuit voltage according to the bias voltage.
Referring to fig. 14, fig. 14 is a schematic structural diagram of a control module in fig. 2. As shown in fig. 14, the control module 14 includes one or more processors 141 and a memory 142. In fig. 14, one processor 141 is taken as an example.
The processor 141 and the memory 142 may be connected by a bus or other means, and fig. 14 illustrates the connection by a bus as an example.
The memory 142 is used as a non-volatile computer-readable storage medium, and can be used to store non-volatile software programs, non-volatile computer-executable programs, modules, and the like, such as program instructions corresponding to the methods in the above-described embodiments of the present invention and modules corresponding to the apparatuses in the above-described embodiments of the present invention (e.g., the first obtaining module 121, the loading module 122, the second obtaining module 123, the first calculating module 124, the third obtaining module 125, the second calculating module 126, and the like). The processor 141 executes various functional applications of a method of detecting a vehicle battery and data processing by executing nonvolatile software programs, instructions, and modules stored in the memory 142, that is, implements functions of the respective modules of the above-described apparatus embodiment and a method of detecting a vehicle battery in the above-described method embodiment.
The memory 142 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created from use of a device that detects a vehicle battery, and the like.
Further, the memory 142 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 142 includes memory located remotely from processor 141, which may be connected to processor 41 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The program instructions and one or more modules are stored in the memory 142 and, when executed by the one or more processors 141, perform the steps of a method of detecting a vehicle battery in any of the above-described method embodiments or implement the functions of the modules of an apparatus of detecting a vehicle battery in any of the above-described apparatus embodiments.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the above-described embodiments of the present invention.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer-executable instructions, which are executed by one or more processors, such as the processor 141 in fig. 14, to enable the computer to perform the steps of a method for detecting a vehicle battery in any of the above-mentioned method embodiments, or to implement the functions of the modules of an apparatus for detecting a vehicle battery in any of the above-mentioned apparatus embodiments.
Embodiments of the present invention also provide a computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions that, when executed by one or more processors, such as the processor 141 in fig. 14, cause the computer to perform the steps of a method for detecting a vehicle battery in any of the above-mentioned method embodiments, or implement the functions of the modules in an apparatus for detecting a vehicle battery in any of the above-mentioned apparatus embodiments.
The above-described embodiments of the apparatus are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that the embodiments may be implemented by software plus a general hardware platform, and may also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware associated with computer program instructions, and that the programs may be stored in a computer readable storage medium, and when executed, may include processes of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it is to be understood that the present invention may be embodied in many different forms and is not limited to the embodiments described in the present specification, which are provided as additional limitations to the present disclosure, and which are provided for the purpose of providing a more thorough understanding of the present disclosure. In the light of the above, the above features are combined with each other and many other variations of the different aspects of the invention described above are considered to be within the scope of the present description; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. A method of testing a vehicle battery, the method being applied to a battery test device including a current sensing module, the battery test device being connected to a vehicle battery through a kelvin connector, the current sensing module being connected to a negative pole of the vehicle battery, the method comprising:
obtaining a noise relationship table for the vehicle battery, wherein the noise relationship table comprises a correspondence between noise current and noise voltage;
applying a load to the vehicle battery;
acquiring a first total current after a load is applied to the vehicle battery, and a load current and a load voltage;
calculating a real load voltage according to the first total current, the load current and the load voltage and by combining the noise relation table;
acquiring an open circuit voltage of the vehicle battery;
and calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the load current.
2. The method of claim 1,
the applying a load to the vehicle battery includes: applying a load of a preset magnitude to the vehicle battery within a preset duration;
the step of obtaining a first total current after the load is applied to the vehicle battery, and a load current and a load voltage further includes:
respectively collecting the total current, the load current and the load voltage after the load is applied within the preset time interval to obtain a plurality of groups of the total current, the load current and the load voltage after the load is applied;
and respectively calculating the average values of the total current, the load current and the load voltage after the load is applied to obtain the first total current, the load current and the load voltage.
3. The method of claim 1, wherein the step of obtaining the open circuit voltage of the vehicle battery further comprises:
acquiring a second total current after releasing the load applied to the vehicle battery, and a no-load current and a no-load voltage;
acquiring the open-circuit voltage according to the second total current, the no-load current and the no-load voltage and by combining the noise relation table;
the step of calculating the internal resistance of the vehicle battery based on the true load voltage, the open circuit voltage, and the load current further includes:
calculating a real load current according to the load current and the no-load current;
and calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the real load current.
4. The method of claim 3, wherein the step of obtaining a second total current after releasing the load applied to the vehicle battery, and an idle current and an idle voltage further comprises:
after releasing the load applied to the vehicle battery, collecting the total current, the no-load current and the no-load voltage after releasing the load at a preset time interval to obtain a plurality of groups of total current, no-load current and no-load voltage after releasing the load;
and respectively calculating the average values of the total current, the no-load current and the no-load voltage after the load is released to obtain the second total current, the no-load current and the no-load voltage.
5. The method of claim 3, wherein the step of obtaining the open circuit voltage according to the second total current, the idle current, and the idle voltage and in combination with the noise relationship table further comprises:
calculating a first current difference value of the second total current and the no-load current;
acquiring a first noise voltage corresponding to the first current difference value according to the noise relation table;
and subtracting the first noise voltage from the no-load voltage to obtain the open-circuit voltage.
6. The method of claim 1, wherein the step of obtaining the open circuit voltage of the vehicle battery further comprises:
acquiring a bias voltage of the battery detection equipment;
and acquiring the open-circuit voltage according to the bias voltage.
7. The method of any one of claims 1 to 6, wherein the step of calculating a true load voltage from the first total current, the load current, and the load voltage in combination with the noise relationship table further comprises:
calculating a second current difference value of the first total current and the load current;
acquiring a second noise voltage corresponding to the second current difference value according to the noise relation table;
and subtracting the second noise voltage from the load voltage to obtain the real load voltage.
8. The method according to any one of claims 1 to 6, wherein the step of obtaining a noise relationship table for the vehicle battery further comprises:
under the condition that no load is applied to the vehicle battery, collecting noise current and noise voltage of the vehicle battery at preset time intervals within a preset time length to obtain multiple groups of noise current and noise voltage of the vehicle battery;
and constructing a corresponding relation between a plurality of groups of noise currents and noise voltages to obtain the noise relation table.
9. The method according to any one of claims 1 to 6, further comprising:
determining a CCA value of the vehicle battery according to the internal resistance of the vehicle battery;
determining a state of health of the vehicle battery based on at least one of the open circuit voltage, the internal resistance, and the CCA value.
10. An apparatus for inspecting a vehicle battery, comprising:
a first obtaining module configured to obtain a noise relationship table for the vehicle battery, wherein the noise relationship table includes a correspondence between a noise current and a noise current;
a loading module for applying a load to the vehicle battery;
the second acquisition module is used for acquiring a first total current after a load is applied to the vehicle battery, and the load current and the load voltage;
the first calculation module is used for calculating real load voltage according to the first total current, the load current and the load voltage and by combining the noise relation table;
a third acquisition module for acquiring an open circuit voltage of the vehicle battery;
and the second calculation module is used for calculating the internal resistance of the vehicle battery according to the real load voltage, the open-circuit voltage and the load current.
11. A battery test apparatus, comprising:
the battery detection module is used for being connected with a vehicle battery through a Kelvin connector;
a load regulation module for applying a load to the vehicle battery;
the current detection module is used for being connected with the negative electrode of the vehicle battery;
a control module connected to the battery detection module, the load adjustment module and the current detection module, respectively, the control module including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein, the first and the second end of the pipe are connected with each other,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 9.
12. A non-transitory computer-readable storage medium storing computer-executable instructions that, when executed by an electronic device, cause the electronic device to perform the method of any of claims 1-9.
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| CN202010675825.9A CN111781526B (en) | 2020-07-14 | 2020-07-14 | Method and device for detecting vehicle battery and battery detection equipment |
| PCT/CN2021/105919 WO2022012499A1 (en) | 2020-07-14 | 2021-07-13 | Method and apparatus for testing vehicle battery and battery testing device |
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| CN113358920A (en) * | 2021-05-17 | 2021-09-07 | 优利德科技(中国)股份有限公司 | Voltage drop measuring device and voltage drop measuring method |
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| JP2009072020A (en) * | 2007-09-14 | 2009-04-02 | Calsonic Kansei Corp | Internal state estimating device of secondary battery |
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| DE102012209660A1 (en) * | 2012-06-08 | 2013-12-12 | Robert Bosch Gmbh | Battery system and associated method for determining the internal resistance of battery cells or battery modules of the battery system |
| CN107861064B (en) * | 2017-07-24 | 2024-05-07 | 广州微宏电源科技有限公司 | Method for detecting electrical performance of multi-series power battery pack |
| CN111781526B (en) * | 2020-07-14 | 2022-05-03 | 深圳市道通科技股份有限公司 | Method and device for detecting vehicle battery and battery detection equipment |
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| CN1725025A (en) * | 2004-07-02 | 2006-01-25 | 金百达科技有限公司 | Monitoring and prewarning method for power source internal resistance for vehicle and its device |
| JP2009214604A (en) * | 2008-03-07 | 2009-09-24 | Autonetworks Technologies Ltd | Battery state estimating device and battery state estimating method |
| CN104678179A (en) * | 2013-11-29 | 2015-06-03 | 上海汽车集团股份有限公司 | Measurement for internal resistance of automobile storage battery |
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