CN107356880B - Battery electric quantity detection method - Google Patents
Battery electric quantity detection method Download PDFInfo
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- CN107356880B CN107356880B CN201710570867.4A CN201710570867A CN107356880B CN 107356880 B CN107356880 B CN 107356880B CN 201710570867 A CN201710570867 A CN 201710570867A CN 107356880 B CN107356880 B CN 107356880B
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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Abstract
The invention provides a battery electric quantity detection method, which comprises the following steps: acquiring voltage value information and current value information of the battery in the charging process under the state of the bare cell through an external voltage and current detection device, and drawing a charging curve of the battery in the charging process according to the voltage value information and the current value information; when a battery assembled in a product is charged, the current charging voltage value of the battery is obtained in real time through the ADC, the current charging current value of the battery is determined according to the corresponding relation between the current charging voltage value and a charging curve of the battery, and the current total electric quantity of the battery is obtained according to the current charging current value and the current charging voltage value. The invention can acquire the total electric quantity of the current battery of the product in real time and realize the precise charging of the product.
Description
Technical Field
The invention relates to the technical field of product battery detection, in particular to a battery electric quantity detection method.
Background
Rechargeable batteries are reusable batteries, typically of the lead-acid, nickel-cadmium, nickel-hydrogen, lithium-ion, fuel cell variety. In recent years, with the wide application of portable products, more and more products adopt a lithium battery as its main power source, and the lithium battery has: the energy-saving battery has the advantages of small volume, high energy density, no memory effect, long cycle life, high-voltage battery, low self-discharge rate, environmental protection, no pollution and the like, and particularly, the excellent high-energy advantage is exerted in the aspect of power supply of notebook computers. However, due to the high energy density and the specific chemical characteristics, the lithium ion battery has hidden troubles in safety and stability, such as over-charge and over-high temperature may burn or even cause explosion, and over-discharge may cause damage to the battery itself. Therefore, it is very important to precisely monitor, protect and calculate the electric quantity of the lithium ion battery.
At present, the detection of the battery capacity of a product is mainly to measure and calculate the total amount of a battery by a method of measuring the battery voltage by an ADC (analog to digital converter) of the product, and the principle of the method is as follows: under different electric quantities, the output voltages of the batteries are different, and the more the electric quantity is, the higher the voltage is; conversely, the smaller the charge, the lower the voltage. However, in the actual charging process, the battery voltage is not only related to the amount of electricity but also to the charging/discharging current of the battery. The battery current of the product is difficult to measure, and the general consumer electronics product does not have the function of measuring the battery current, so that the battery power of the product is inaccurate to detect, and the error is large.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for detecting battery power, so as to solve the problems of low accuracy and large error of battery power detection in the current products.
The battery electric quantity detection method provided by the invention comprises the following steps: acquiring voltage value information and current value information of the battery in the charging process under the state of the bare cell through an external voltage and current detection device, and drawing a charging curve of the battery in the charging process according to the voltage value information and the current value information; when a battery assembled in a product is charged, the current charging voltage value of the battery is obtained in real time through the ADC, the current charging current value of the battery is determined according to the corresponding relation between the current charging voltage value and a charging curve of the battery, and the current total electric quantity of the battery is obtained according to the current charging current value and the current charging voltage value.
In addition, it is preferable that the charging curve includes a voltage-time variation curve and a current-time variation curve; and, at the same time point, the voltage value and the current value of the current charge of the battery correspond to each other.
In addition, it is preferable that the charged electric quantity of the battery is acquired according to the current total electric quantity and the charging time of the battery.
In addition, it is preferable that the actual charging capacity of the battery is acquired from the charging curve; and acquiring the current charging percentage of the battery according to the current total electric quantity and the actual charging capacity of the battery.
In addition, the preferable scheme is that when the current charging percentage of the battery is larger than a highest preset threshold value or smaller than a lowest preset threshold value, charging alarm reminding is performed.
Furthermore, it is preferable that the ADC is provided inside the product or the ADC is disposed outside the product.
By utilizing the battery electric quantity detection method, the external voltage and current detection device is firstly utilized to acquire the voltage value information and the current value information of the battery in the actual charging process, and the curve of the corresponding voltage value and current value changing along with the time is drawn, then the ADC is utilized to acquire the current charging voltage value of the product in real time when the product assembled with the battery is charged, and then the charging curve is combined, so that the total electric quantity of the current battery of the product can be acquired, the charging precision of the product is high, and the electric quantity detection error is small.
To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a flowchart of a battery power detection method according to an embodiment of the invention.
FIG. 2 is a graph of voltage versus time according to an embodiment of the present invention;
FIG. 3 is a graph of current versus time according to an embodiment of the present invention.
The same reference numbers in all figures indicate similar or corresponding features or functions.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to facilitate describing one or more embodiments.
To describe the battery charge level detection method of the present invention in detail, specific embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 shows a flow of a battery charge level detection method according to an embodiment of the present invention.
As shown in fig. 1, the method for detecting battery power according to the embodiment of the present invention includes the following steps:
s110: and acquiring voltage value information and current value information of the battery in the charging process in the state of the bare cell through an external voltage and current detection device, and drawing a charging curve of the battery in the charging process according to the voltage value information and the current value information.
The state of the bare cell refers to the state when the cell is not assembled inside a product, when the bare cell is charged, the charging voltage value information and the charging current value information are easy to obtain, and the accuracy is high, so that before the cell is not assembled, the voltage value information and the current value information of the bare cell in the charging process can be obtained through an external voltage and current detection device, and when the product (or the cell) is charged after the cell is assembled to the product, the voltage value information and the current value information (or the charging curve) can be used as reliable reference bases for improving the detection precision of the electric quantity of the product cell.
Specifically, the charging curve further includes a voltage-over-time curve and a current-over-time curve; at the same time point, the voltage value and the current value of the current charging of the battery correspond to each other. The actual charging capacity of the battery, namely the total capacity of the fully charged battery can be obtained by performing integral calculation on the charging curve, and the total capacity can be used as the percentage of the charged battery of a later-stage calculation product or a reference value for calculating the current charging capacity.
Specifically, fig. 2 and 3 respectively show a voltage-versus-time curve in which the horizontal axis represents time (unit: sec) and the vertical axis represents voltage (unit: volt), and a current-versus-time curve in which the horizontal axis represents time (unit: sec) and the vertical axis represents current (unit: ma), according to an embodiment of the present invention, and the actual charge capacity of the battery can be obtained by integrating the voltage curve (voltage-versus-time curve) and the current curve (current-versus-time curve).
S120: when a battery assembled in a product is charged, the current charging voltage value of the battery is obtained in real time through the ADC, the current charging current value of the battery is determined according to the corresponding relation between the current charging voltage value and a charging curve of the battery, and the current total electric quantity of the battery is obtained according to the current charging current value and the current charging voltage value.
After the battery is assembled to the whole product, the charging process of the battery can also be understood as the charging process of the product, when the product is charged, the current charging voltage value of the battery is obtained in real time through an Analog-to-Digital Converter (ADC), and then the current charging current value of the battery can be determined according to the current charging voltage value and the charging curve, that is, the current charging current value corresponding to the current charging voltage value is determined by combining the corresponding relationship between the current charging voltage value and the charging curve, and the current total electric quantity of the battery is calculated according to the current charging voltage value and the current charging current value.
Because the operation of measuring the battery current of the product is difficult after the battery is assembled into the product, and a common consumer electronic product does not have the function of detecting the battery current, in the method for detecting the battery electric quantity, firstly, a charging curve in the charging process of the battery is determined when the battery is in a bare battery state, after the battery is assembled into the product, and the current charging voltage value of the battery is obtained through ADC implementation, the current charging current value corresponding to the current charging voltage value can be obtained according to the curve of the voltage changing along with time and the curve of the current changing along with time, and as the total electric quantity of the battery is equal to the integral of the product of the charging current and the charging time, the current total electric quantity of the battery can be calculated according to the current charging voltage value and the current charging current value, and the detection precision of the battery electric quantity can be effectively improved.
Further, after the current total electric quantity of the battery is obtained, it can also be understood that after the current total battery quantity of the product is obtained, the charging electric quantity of the battery can be obtained according to the current total electric quantity of the battery and the charging time or the time when the charging is started, and the sum of the charging electric quantity and the previous electric quantity of the battery is the current total electric quantity of the battery; it is known that the current total charge of the battery is not greater than the actual charge capacity of the battery.
In one embodiment of the present invention, the actual charging capacity of the battery can be obtained by using an integration principle according to the voltage-time variation curve and the current-time variation curve, and the current charging percentage of the battery can be obtained according to the current total charge and the actual charging capacity of the battery.
In addition, an alarm device can be arranged in the product, when the current charging percentage of the product battery is larger than the highest preset threshold value or smaller than the lowest preset threshold value, charging alarm reminding can be carried out through the alarm device, and the alarm reminding can be reminding of an indicator light or sound and light reminding.
In another embodiment of the present invention, the ADC may be disposed inside the product or may be disposed outside the product.
By utilizing the battery electric quantity detection method, the precision charging of the product can be realized, the total electric quantity and the charging electric quantity of the battery can be acquired in real time in the product charging process, and the battery electric quantity detection error is small and the precision is high.
The battery charge amount detection method according to the present invention is described above by way of example with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that various modifications may be made to the battery charge detection method of the present invention without departing from the scope of the invention. Therefore, the scope of the present invention should be determined by the contents of the appended claims.
Claims (6)
1. A battery power detection method is characterized by comprising the following steps:
acquiring voltage value information and current value information of a battery in a charging process in a bare cell state through an external voltage and current detection device, and drawing a charging curve of the battery in the charging process according to the voltage value information and the current value information;
when the battery assembled in a product is charged, the current charging voltage value of the battery is obtained in real time through an analog-to-digital converter, the current charging current value of the battery is determined according to the corresponding relation between the current charging voltage value and the charging curve of the battery, and the current total electric quantity of the battery is obtained according to the current charging current value and the current charging voltage value.
2. The battery power level detection method of claim 1,
the charging curve comprises a voltage-time variation curve and a current-time variation curve; and the number of the first and second electrodes,
at the same time point, the currently charged voltage value and the current value of the battery correspond to each other.
3. The battery power level detection method of claim 1,
and acquiring the charging electric quantity of the battery according to the current total electric quantity and the charging time of the battery.
4. The battery power level detection method of claim 1,
acquiring the actual charging capacity of the battery according to the charging curve;
and acquiring the current charging percentage of the battery according to the current total electric quantity and the actual charging capacity of the battery.
5. The battery level detection method of claim 4,
and when the current charging percentage of the battery is larger than the highest preset threshold value or smaller than the lowest preset threshold value, performing charging alarm reminding.
6. The battery power level detection method of claim 1,
the analog-to-digital converter is arranged inside the product or the analog-to-digital converter is arranged outside the product.
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| CN111487536A (en) * | 2020-05-21 | 2020-08-04 | 歌尔科技有限公司 | Earphone box battery electric quantity collection method and device, earphone box and storage medium |
| CN112667064B (en) * | 2020-12-25 | 2023-03-24 | 中孚信息股份有限公司 | Detection voltage calibration method and system of data processing equipment |
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