CN112198442A - Battery power detection method and detection system - Google Patents
Battery power detection method and detection system Download PDFInfo
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- CN112198442A CN112198442A CN202011190563.3A CN202011190563A CN112198442A CN 112198442 A CN112198442 A CN 112198442A CN 202011190563 A CN202011190563 A CN 202011190563A CN 112198442 A CN112198442 A CN 112198442A
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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
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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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
本发明公开了一种电池电量检测方法及检测系统，该检测方法包括：分别获取第一时刻、第二时刻负载两端的第一电压、第二电压以及流过负载的第一电流、第二电流；获取当前时刻负载两端的当前电压和流过负载的当前电流；利用一预设公式以及当前电流、第一电压、第二电压、第一电流和第二电流计算出电压补偿参数；根据电压补偿参数及当前电压计算出当前时刻电池的实际电压；根据当前时刻电池的实际电压以及电池的电池电压‑电池电量充放电曲线获取电池的电量。该方法能够计算出电池内阻，间接计算出电压补偿参数，解决了因系统负载电流大或者内阻大导致电池电压‑电池电量判读精度差，甚至出现误报的问题。
The invention discloses a battery power detection method and a detection system. The detection method comprises: respectively acquiring a first voltage and a second voltage across a load at a first moment and a second moment, and a first current and a second current flowing through the load. ; obtain the current voltage across the load at the current moment and the current current flowing through the load; use a preset formula and the current current, the first voltage, the second voltage, the first current and the second current to calculate the voltage compensation parameter; according to the voltage compensation The actual voltage of the battery at the current moment is calculated from the parameters and the current voltage; the power of the battery is obtained according to the actual voltage of the battery at the current moment and the battery voltage-battery charge-discharge curve of the battery. This method can calculate the internal resistance of the battery and indirectly calculate the voltage compensation parameters, which solves the problem of poor battery voltage-battery power interpretation accuracy and even false alarms due to large system load current or large internal resistance.
Description
Technical Field
The invention relates to the technical field of battery electric quantity detection, in particular to a battery electric quantity detection method and a battery electric quantity detection system.
Background
The mainstream battery power detection method at present is to simply measure the battery voltage and interpret the battery power through a battery voltage-battery power charging and discharging curve, as shown in fig. 1, a conventional battery voltage acquisition equivalent circuit diagram.
However, this method has the following problems: neglecting the internal resistance of the battery and the parasitic resistance generated by a battery socket, a circuit and the like, the battery voltage error is large when the load current is large, and the battery electric quantity interpretation precision is greatly reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a battery electric quantity detection method and a battery electric quantity detection system, so that the battery electric quantity detection is more accurate.
The invention solves the technical problems by the following technical means:
in a first aspect, the present invention provides a method for detecting an electric quantity of a battery, where the battery and a load are connected in series in a circuit, the method including:
respectively acquiring a first voltage and a second voltage at two ends of the load at a first moment and a second moment, and a first current and a second current flowing through the load;
acquiring the current voltage at two ends of the load and the current flowing through the load at the current moment;
calculating a voltage compensation parameter by using a preset formula and the current, the first voltage, the second voltage, the first current and the second current;
calculating the actual voltage of the battery at the current moment according to the voltage compensation parameter and the current voltage;
and acquiring the electric quantity of the battery according to the actual voltage of the battery at the current moment and a battery voltage-battery electric quantity charging and discharging curve of the battery.
Further, the preset formula is as follows:
v＝I*|ΔV/ΔI|，
ΔV＝V1-V0，
ΔI＝I1-I0；
where V is a voltage compensation parameter, I is the present current through the load, V0Is a first voltage, V1Is a second voltage, I0Is a first voltage, I1Is a second voltage.
Further, the actual voltage E of the battery at the current moment is calculated by using the following formula:
E＝v+V；
wherein V is a voltage compensation parameter, and V is a current voltage across the load.
Further, the interval between the first time and the second time is not more than 1 ms.
In a second aspect, the present invention further provides a battery power detecting system for detecting a power of a battery, where the battery is connected in series with a load in a circuit, the system including:
the battery data acquisition module is positioned in the loop and used for respectively acquiring first voltage and second voltage at two ends of the load at a first moment and a second moment as well as first current and second current flowing through the load; acquiring the current voltage at two ends of the load and the current flowing through the load at the current moment;
the voltage compensation parameter calculation module is used for calculating a voltage compensation parameter by utilizing a preset formula and the current, the first voltage, the second voltage, the first current and the second current;
the battery actual voltage calculation module is used for calculating the actual voltage of the battery at the current moment according to the voltage compensation parameter and the current voltage; and
and the battery electric quantity interpretation module is used for acquiring the electric quantity of the battery according to the actual voltage of the battery at the current moment and a battery voltage-battery electric quantity charging and discharging curve of the battery.
Furthermore, the battery data acquisition module comprises a current sampling unit, a voltage sampling unit and a sampling point control unit, wherein the sampling point control unit is used for controlling the current sampling unit to collect the current flowing through the load at a preset moment and controlling the voltage sampling unit to collect the voltages at two ends of the load at a preset moment.
Further, the current sampling unit comprises a current sampling resistor and a charging and discharging current detection circuit, the current sampling resistor is connected in series in the loop, the charging and discharging current detection circuit is connected at two ends of the sampling resistor respectively, and the output end of the charging and discharging current detection circuit is connected with the sampling point control unit.
Further, the charge and discharge current detection circuit includes a current detection amplifier and a reference voltage element;
the current detection amplifier is connected with two ends of the current sampling resistor, acquires a current value flowing through the current sampling resistor through a differential signal, and outputs a voltage value corresponding to the current after amplification;
the reference voltage element is connected with the current detection amplifier and used for providing reference voltage for the current detection amplifier.
Furthermore, the voltage sampling unit comprises a voltage follower and two divider resistors, the two divider resistors are connected in series and then connected in parallel at two ends of the load, the input end of the voltage follower is connected between the two divider resistors, and the output end of the voltage follower is connected with the sampling point control unit.
Furthermore, a switch tube is connected in series between the two voltage dividing resistors.
The invention has the beneficial effects that:
the battery electric quantity detection method can calculate the internal resistance of the battery and indirectly calculate the voltage compensation parameter, and solves the problems of poor battery voltage-battery electric quantity interpretation precision and even false alarm caused by large system load current or large internal resistance.
The battery electric quantity detection system has low hardware cost and simple and reliable implementation scheme.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a diagram of an equivalent circuit for acquiring the voltage of a conventional battery;
FIG. 2 is a flow chart of a method for detecting battery power according to the present invention;
FIG. 3 is an equivalent circuit diagram of the improved battery voltage acquisition provided by the present invention;
fig. 4 is a circuit diagram of a battery data acquisition module according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
As shown in fig. 2, the present embodiment provides a method for detecting a battery level, where the battery and a load are connected in series in a circuit, the method includes:
s1, respectively obtaining a first voltage and a second voltage at two ends of the load at a first moment and a second moment, and a first current and a second current flowing through the load;
s2, acquiring the current voltage at two ends of the load and the current flowing through the load at the current moment;
s3, calculating a voltage compensation parameter by using a preset formula and the current, the first voltage, the second voltage, the first current and the second current;
s4, calculating the actual voltage of the battery at the current moment according to the voltage compensation parameter and the current voltage;
and S5, acquiring the electric quantity of the battery according to the actual voltage of the battery at the current moment and the battery voltage-battery electric quantity charging and discharging curve of the battery.
Specifically, the preset formula is as follows:
v＝I*|ΔV/ΔI|，
ΔV＝V1-V0，
ΔI＝I1-I0；
where V is a voltage compensation parameter, I is the present current through the load, V0Is a first voltage, V1Is a second voltage, I0Is a first voltage, I1Is a second voltage.
After the voltage compensation parameter v is calculated, the actual voltage E of the battery at the current moment can be calculated by using the following formula:
E＝v+V；
wherein V is a voltage compensation parameter, and V is a current voltage across the load.
In this embodiment, an interval between the first time and the second time is not greater than 1 ms.
Example 2
In a second aspect, the present invention further provides a battery power detection system for detecting a power of a battery by the battery power detection method provided in embodiment 1, where the battery and a load are connected in series in a loop, and the system includes:
the battery data acquisition module is positioned in the loop and used for respectively acquiring first voltage and second voltage at two ends of the load at a first moment and a second moment as well as first current and second current flowing through the load; acquiring the current voltage at two ends of the load and the current flowing through the load at the current moment;
the voltage compensation parameter calculation module is used for calculating a voltage compensation parameter by utilizing a preset formula and the current, the first voltage, the second voltage, the first current and the second current;
the battery actual voltage calculation module is used for calculating the actual voltage of the battery at the current moment according to the voltage compensation parameter and the current voltage; and
and the battery electric quantity interpretation module is used for acquiring the electric quantity of the battery according to the actual voltage of the battery at the current moment and a battery voltage-battery electric quantity charging and discharging curve of the battery.
Specifically, the improved battery voltage detection scheme of this embodiment is shown in fig. 3, and it is assumed that the actual voltage of the battery is E, the internal resistance and the parasitic resistance of the battery are r, the charging and discharging current of the battery is I, and the voltage across the battery load is V. The AD sampling period is set to 1ms, and the magnitude of r can be derived from the following equation:
E0＝I0*r+V0； (1)
E1＝I1*r+V1； (2)
where E1 is separated from E0 by one AD sample period. Then equation (2) minus equation (1) yields:
ΔE＝ΔI*r+ΔV； (3)
since the sampling period is 1ms, which is very short, Δ E → 0, r is considered to remain unchanged in practical application. Then it can be calculated:
r＝|ΔV/ΔI|； (4)
indirectly obtaining the internal resistance r through the voltage change delta V caused by the detected current change delta I, and then determining the compensation voltage parameter as follows according to the detected current I:
v＝I*r； (5)
the actual battery voltage E is then:
E＝v+V； (6)
combining equations (4) (5) yields:
E＝I*|ΔV/ΔI|+V； (7)
therefore, the actual battery voltage E can be accurately obtained by the formula (7).
In this embodiment, the battery data acquisition module includes a current sampling unit, a voltage sampling unit, and a sampling point control unit, where the sampling point control unit is configured to control the current sampling unit to collect current flowing through the load at a predetermined time, and control the voltage sampling unit to collect voltages at two ends of the load at a predetermined time.
Specifically, as shown in fig. 4, the current sampling unit includes a current sampling resistor R2 and a charging and discharging current detection circuit, the current sampling resistor R2 is connected in series in the loop, the charging and discharging current detection circuit is respectively connected to two ends of the current sampling resistor R2, and an output end of the charging and discharging current detection circuit is connected to the sampling point control unit.
The charging and discharging current detection circuit comprises a current detection amplifier and a reference voltage element;
the current detection amplifier U2 is connected with two ends of the current sampling resistor R2, obtains the current value flowing through the current sampling resistor R2 through differential signals, and outputs the voltage value corresponding to the current after amplification;
the reference voltage element U3 is connected to the current sense amplifier U2, and is used to provide a reference voltage for the current sense amplifier U2, which ensures that the U2 can detect the charging and discharging bidirectional current.
In this embodiment, the current detection amplifier U2 has a model number INA199A, and the reference voltage element U3 has a model number AD8515 ARTZ.
Specifically, as shown in fig. 4, the voltage sampling unit includes a voltage follower U1 and two voltage dividing resistors R1 and R7, the two voltage dividing resistors are connected in series and then connected in parallel to two ends of the load, an input end of the voltage follower U1 is connected between the two voltage dividing resistors, and an output end of the voltage follower U1 is connected to the sampling point control unit.
Further, in order to reduce the static current loss of the battery in the non-power-on state and avoid the over-low response speed of the voltage follower U1 caused by the over-large resistance of the voltage dividing network formed by R1 and R7, a switch tube Q1 is connected in series between the two voltage dividing resistors, and the switch tube Q1 is an NMOS tube.
In summary, the battery power detection method provided by the embodiment of the invention can calculate the internal resistance of the battery, indirectly calculate the voltage compensation parameter, and solve the problems of poor battery voltage-battery power interpretation precision and even false alarm caused by large system load current or large internal resistance.
The battery electric quantity detection system has low hardware cost and simple and reliable implementation scheme.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (10)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112991024A (en) * | 2021-04-22 | 2021-06-18 | 北京小白世纪网络科技有限公司 | Method and system for renting shared medical intelligence detection robot |
| CN115542171A (en) * | 2022-11-02 | 2022-12-30 | 深圳市好盈科技股份有限公司 | Method, system, device and medium for calculating battery power |
| CN118112441A (en) * | 2024-02-08 | 2024-05-31 | 中国铁塔股份有限公司 | Battery Fuel Gauging Circuit |
| CN119448504A (en) * | 2025-01-08 | 2025-02-14 | 深圳新芯智能有限公司 | Power supply circuit and power supply detection method for series connection of batteries |
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| CN119448504A (en) * | 2025-01-08 | 2025-02-14 | 深圳新芯智能有限公司 | Power supply circuit and power supply detection method for series connection of batteries |
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