CN212301804U - Battery capacity measuring system - Google Patents
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- CN212301804U CN212301804U CN202021008607.1U CN202021008607U CN212301804U CN 212301804 U CN212301804 U CN 212301804U CN 202021008607 U CN202021008607 U CN 202021008607U CN 212301804 U CN212301804 U CN 212301804U
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Abstract
The embodiment of the utility model discloses a battery capacity measuring system, which comprises a shunting detection module, a capacity calculation module and a conversion module which are electrically connected with a battery to be measured, wherein the capacity calculation module is connected with the shunting detection module and the conversion module; the shunt detection module is used for performing shunt detection on the current of the battery to be detected according to a preset proportion so as to obtain a current measurement value; the capacity calculation module is used for carrying out integral operation on the current measurement value to obtain a capacity measurement value of the battery to be measured; the conversion module is used for amplifying the capacity measurement value according to the reciprocal of the preset proportion to obtain the real capacity value of the battery to be measured. The utility model discloses can realize the battery capacity measurement operation of high accuracy.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a battery capacity measurement system.
Background
In recent years, with the continuous development of urban scale, the demand of road lighting will be larger and larger, and the solar street lamp is used as the first choice of lighting products and is more and more widely applied. Meanwhile, the market scale of the global small-sized generator is getting larger and larger, and the energy storage requirement when the generator is applied to different scenes is also getting larger and larger. Both industries have a demand for large-capacity batteries, and since the single-cell scheme has advantages in service life, more and more manufacturers use 3.2V lithium iron phosphate batteries as storage batteries. Through the direct power supply of single section battery, can solve the inconsistent problem of establishing ties between the electric core, design life can improve greatly.
However, in a battery system using a solar street lamp and a small-sized home energy storage system in which a single cell is directly boosted, there is a problem in that SOC (State of Charge) of a battery is difficult to calculate.
At present, most of the methods adopt a voltage-SOC fitting method or an ampere-hour integration method to estimate the SOC, but the voltage-SOC of the lithium iron phosphate battery is nonlinear and has large variation deviation caused by temperature, current and internal resistance, so that the calculation is inaccurate. For the way of calculating the SOC by ampere-hour integration, since the capacity of a single battery is often large, the current chip for calculating the SOC is usually used for a 3C battery, and the capacity of the chip is below 30AH, or is used for a battery with a voltage of 12.8V or more in an energy storage or electric vehicle. Therefore, at present, the capacity of a single battery with large capacity is difficult to measure, and accurate calculation of the SOC of the single battery is difficult to realize.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a battery capacity measurement system, capacity that can the single section battery of accurate measurement large capacity.
A battery capacity measurement system comprising:
the shunt detection module is electrically connected with a battery to be detected and used for performing shunt detection on the current of the battery to be detected according to a preset proportion to obtain a current measurement value reflecting the current of the battery to be detected;
the capacity calculation module is electrically connected with the shunt detection module and used for receiving the current measurement value, and performing integral operation on the current measurement value to obtain a capacity measurement value of the battery to be tested;
and the conversion module is electrically connected with the capacity calculation module and used for receiving the capacity measurement value and amplifying the capacity measurement value according to the reciprocal of the preset proportion to obtain the real capacity value of the battery to be measured.
Optionally, the shunt detection module includes a shunt, the shunt is connected in series with the battery to be detected, the shunt is electrically connected to the capacity calculation module, the shunt detects the current of the battery to be detected based on a built-in detection loop, and feeds a current measurement value back to the capacity calculation module based on the current of the battery to be detected.
Optionally, the internal resistance of the shunt is 75 milliohms, and the detection accuracy is 1%.
Optionally, the capacity calculation module includes an electric quantity monitor, and the electric quantity monitor is electrically connected to the shunt, and is configured to receive the current measurement value and obtain a capacity measurement value of the battery to be measured according to the current measurement value and the accumulated amount of time;
the electric quantity monitoring meter is also electrically connected with the battery to be measured and is used for directly measuring the voltage information, the temperature information and the impedance information of the battery to be measured.
Optionally, the conversion module includes a transmission unit and a conversion unit, the transmission unit is electrically connected to the capacity calculation module, the conversion unit is electrically connected to the transmission unit, the transmission unit is configured to transmit the capacity measurement value to the conversion unit, and the conversion unit is configured to amplify the capacity measurement value to obtain the actual capacity value of the battery to be measured.
Optionally, the conversion unit includes a single chip microcomputer, and the single chip microcomputer is configured to amplify the capacity measurement value according to a reciprocal of the preset ratio to obtain a real capacity value of the battery to be measured, and perform protocol conversion on the real capacity value to obtain a real capacity value according with a target communication protocol.
Optionally, the transmission unit includes a serial port conversion chip, the serial port conversion chip is electrically connected to the single chip microcomputer, the serial port conversion chip is electrically connected to the target host, and the serial port conversion chip performs data transmission based on a built-in communication protocol and is configured to transmit the real capacity value conforming to the target communication protocol to the target host.
Implement the embodiment of the utility model provides a, will have following beneficial effect:
in the battery capacity measuring system, the current of the battery to be measured is subjected to shunt detection according to a preset proportion through the shunt detection module, and a current measurement value reflecting the current of the battery to be measured is obtained; a capacity calculation module receives the current measurement value, and performs integral operation on the current measurement value to obtain a capacity measurement value of the battery to be measured; and the conversion module receives the capacity measurement value and amplifies the capacity measurement value according to the reciprocal of the preset proportion to obtain the real capacity value of the battery to be measured. The current of the high-capacity single battery is measured by shunting according to the preset proportion, and the current is amplified after the capacity value is calculated to obtain the real capacity value of the high-capacity single battery, so that the capacity of the high-capacity single battery can be accurately measured, and the accurate calculation of the SOC of the single battery is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Wherein:
FIG. 1 is a block diagram showing a configuration of a battery capacity measuring system according to an embodiment;
FIG. 2 is a topology diagram of a battery capacity measurement system in one embodiment;
FIG. 3 is a schematic circuit diagram of an embodiment of a coulometer;
FIG. 4 is a block diagram showing the construction of a battery capacity measuring system in another embodiment;
FIG. 5 is a schematic flow chart of a method for measuring battery capacity according to an embodiment;
FIG. 6 is a flow diagram illustrating the calculation of the current measurement in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
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 application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
For the battery system who adopts solar street lamp, small-size family energy storage system etc. that single section electric core directly steps up among the solution prior art, there is the problem that the SOC of battery calculated the difficulty, the utility model particularly provides a battery capacity measurement system, this measurement system are applied to the battery system of solar street lamp, small-size family energy storage system etc. can realize calculating the high accuracy of SOC.
Fig. 1 is a block diagram of a battery capacity measuring system in an embodiment, which is used to measure a real-time capacity of a large-capacity single battery, and further accurately calculate the SOC of the single battery, where the large capacity refers to a high rated capacity of the single battery, such as 400 AH. As shown in fig. 1, the battery capacity measuring system includes a shunt detection module 110, a capacity calculation module 120, and a conversion module 130, where the shunt detection module 110 is electrically connected to a battery to be tested, the capacity calculation module 120 is electrically connected to the shunt detection module 110, and the conversion module 130 is electrically connected to the capacity calculation module 120.
The shunt detection module 110 is configured to perform shunt detection on the current of the battery to be detected according to a preset ratio, so as to obtain a current measurement value reflecting the current of the battery to be detected. The battery to be tested can be understood as a large-capacity single battery. The shunt detection module 110 may be a shunt, which is a device for measuring a direct current, and may measure the magnitude of the direct current according to a voltage generated across a resistor when the direct current passes through the resistor inside the shunt. The preset ratio refers to a ratio of the current magnitude measured by the shunt detection module 110 to the actual current magnitude, and in this embodiment, the preset ratio of the shunt detection module 110 may be determined by selecting the measurement range of the shunt detection module 110, for example, the preset ratio may be 1:10, that is, the actual current magnitude of the battery to be tested is 10 times of the current measurement value measured by the shunt detection module 110.
The capacity calculation module 120 is configured to receive the current measurement value, and perform an integral operation on the current measurement value to obtain a capacity measurement value of the battery to be tested. Specifically, the capacity calculation module 120 may be an electric quantity monitor, and the electric quantity monitor may collect a current measurement value measured by the shunt detection module 110, and obtain a capacity measurement value of the battery to be measured by calculating an accumulated amount of the current measurement value and time, where the capacity measurement value refers to a capacity value calculated according to the current measurement value, and the capacity measurement value has a same size relationship with the real capacity of the battery to be measured in a preset ratio.
The conversion module 130 is configured to receive the capacity measurement value, and amplify the capacity measurement value according to the reciprocal of the preset ratio to obtain the actual capacity value of the battery to be measured. The actual capacity value can be understood as an actual capacity value of the battery to be tested in the current use state, for example, the remaining dischargeable electric quantity after the battery is used for a period of time or left unused for a long time.
Specifically, the conversion module 130 may be a single chip microcomputer, and the single chip microcomputer amplifies the capacity measurement value according to a reciprocal of a preset ratio, for example, if the preset ratio is 1:10, the actual capacity value of the battery to be measured is 10 times of the capacity measurement value.
Further, a ratio of the actual capacity value of the battery to be tested to the electric quantity of the battery to be tested in the fully charged state is obtained, that is, the SOC of the battery to be tested is obtained through calculation, which reflects that the remaining electric quantity of the battery to be tested is 0% -100%, when the SOC is equal to 0, the battery is completely discharged, and when the SOC is equal to 100%, the battery is completely charged.
In the battery capacity measuring system, the current of the battery to be measured is subjected to shunt detection according to a preset proportion through the shunt detection module, and a current measurement value reflecting the current of the battery to be measured is obtained; a capacity calculation module receives the current measurement value, and performs integral operation on the current measurement value to obtain a capacity measurement value of the battery to be measured; and the conversion module receives the capacity measurement value and amplifies the capacity measurement value according to the reciprocal of the preset proportion to obtain the real capacity value of the battery to be measured. The current of the high-capacity single battery is measured by shunting according to the preset proportion, and the current is amplified after the capacity value is calculated to obtain the real capacity value of the high-capacity single battery, so that the capacity of the high-capacity single battery can be accurately measured, and the accurate calculation of the SOC of the single battery is realized.
In an embodiment, fig. 2 is a topological diagram of a battery capacity measuring system in an embodiment, and the shunt detection module includes a shunt, as shown in fig. 2, the shunt is connected in series with a battery to be measured, the shunt is electrically connected to the capacity calculation module, and the capacity calculation module may specifically be an electric quantity monitor, that is, the shunt is electrically connected to the electric quantity monitor. The current divider detects the current of the battery to be detected based on a built-in detection loop, and feeds a current measurement value back to the capacity calculation module based on the current of the battery to be detected.
Specifically, a resistor with a small resistance value is arranged in the shunt, when direct current passes through the resistor, voltage drop is generated and is displayed by the direct current meter, the direct current meter is actually a voltmeter, and the measured current is reflected through the reading of the voltmeter. For example, if the full scale voltmeter has a full scale value of 75mV and the shunt resistance is 0.00075 ohms, the magnitude of the current measured by the full scale voltmeter is 100A, i.e., 100A × 0.00075 ohms — 75 mV.
For example, in one embodiment, the internal resistance of the shunt is 75 milliohms with a detection accuracy of 1%. The electric quantity monitoring meter detects that the voltage at two ends of the current divider is +0.75V, and the current output by the current to be detected is as follows: +0.75/(75 × 0.001) +10A, indicating the current system discharge 10A.
In one embodiment, the capacity calculating module includes a power monitor, and please refer to fig. 2, the power monitor is electrically connected to the shunt, and is configured to receive the current measurement value measured by the shunt, and obtain the capacity measurement value of the battery to be tested according to the current measurement value and the cumulative amount of time. Furthermore, the electric quantity monitoring meter is electrically connected with the battery to be measured and is used for directly measuring the voltage information, the temperature information and the impedance information of the battery to be measured.
Specifically, the electric quantity monitoring meter is internally provided with a high-precision coulomb counter, so that the information such as the voltage, the temperature, the current, the impedance and the like of the battery to be measured can be obtained. The electric quantity monitoring meter can obtain the current charge-discharge state of the battery to be tested by analyzing the voltage of the battery to be tested. The capacity measurement value of the battery to be measured can be calculated by carrying out integral operation on the current and the time, namely according to the calculation formula
The capacity measurement is calculated, where C is the capacity test value and I is the current, and the calculation is the integral of the current I over the time period t0 to t 1.
In one embodiment, the charge monitoring meter is model number BQ27750, and fig. 3 is a schematic circuit connection diagram of BQ 27750. The SRN pin and the SRP pin of the electric quantity monitoring meter U3 are connected with the shunt, and are used for acquiring the voltage at two ends of the internal resistor of the shunt, and the voltage is connected to the internal coulomb counter through the SRN pin and the SRP pin, so that the calculation of a capacity measurement value is realized.
In one embodiment, as shown in fig. 4, the conversion module 430 includes a transmission unit 431 and a conversion unit 432, the transmission unit 431 is electrically connected to the capacity calculation module 420, the conversion unit 432 is electrically connected to the transmission unit 431, the transmission unit 431 is configured to transmit the capacity measurement value to the conversion unit 432, and the conversion unit 432 is configured to amplify the capacity measurement value to obtain the real capacity value of the battery under test.
Specifically, please continue to refer to fig. 2, the conversion unit includes a single chip microcomputer, and the single chip microcomputer is configured to amplify the capacity measurement value according to the reciprocal of the preset ratio to obtain a real capacity value of the battery to be measured, and perform protocol conversion on the real capacity value to obtain a real capacity value according with a target communication protocol. For example, when the ratio of the current measurement detected by the current divider to the true current magnitude is 1: and when the capacity is 10 times, amplifying the capacity measurement value by 10 times to obtain a real capacity value reflecting the current capacity of the battery to be measured. Furthermore, because the data output by the electricity quantity monitoring meter is data of an I2C communication protocol, the single chip microcomputer performs protocol conversion on the real capacity value, namely, the data of the I2C communication protocol is converted into serial port communication data meeting the requirements of a target host, for example, data meeting an RS232 or RS484 communication protocol.
Further, please continue to refer to fig. 2, the transmission unit includes a serial port conversion chip, the serial port conversion chip is electrically connected to the single chip, the serial port conversion chip is electrically connected to the target host, and the serial port conversion chip performs data transmission based on a built-in communication protocol and is configured to transmit the real capacity value conforming to the target communication protocol to the target host. Wherein the target host can be a solar street light system or a host of a small home energy storage system. Specifically, the serial port conversion chip is of a model number SP 3232.
In an embodiment, please continue to refer to fig. 2, the battery capacity measuring system further includes a power conversion module, the power conversion module is electrically connected to the battery to be measured and the conversion module respectively, that is, the power conversion module is electrically connected to the single chip microcomputer and the serial port conversion chip, the power conversion module is configured to provide a stable 3.3V power supply for the single chip microcomputer and the serial port conversion chip, and the type of the power conversion module may be TPS 63030.
In a specific embodiment, if the capacity of the battery to be tested is 400AH, the embodiment uses the BQ27750 to measure the capacity of the battery to be tested, and the BQ27750 can test the capacity within 40 AH. For example, the current of the battery to be tested is 10A, the current divider for BQ27750 primary power calculation is 750 milli-ohms, and the current divider used in this embodiment is 75 milli-ohms. Therefore, the current detected on the system circuit is 1.0A, the capacity calculated through integration is 10 times smaller, if the real capacity of the battery to be measured is 390AH, the capacity measured through BQ27750 is 39AH and is within the measurable range of BQ27750, and the measured capacity is amplified by 10 times through the single chip microcomputer, so that the real capacity of the battery to be measured can be obtained.
According to the battery capacity measuring system, the current of the high-capacity single battery is measured by shunting according to the preset proportion, and the current is amplified after the capacity value is calculated to obtain the real capacity value of the high-capacity single battery, so that the capacity of the high-capacity single battery can be accurately measured, and the accurate calculation of the SOC of the single battery is realized.
Based on same utility model design, the embodiment of the utility model provides a still provide a measurement method of battery capacity, this measurement method is based on above-mentioned arbitrary embodiment battery capacity measurement system realize the measurement operation to battery capacity.
Specifically, as shown in fig. 5, in one embodiment, the method for measuring the battery capacity includes:
step S10: and acquiring a current measurement value corresponding to the current of the battery to be measured.
The current measurement value is obtained by shunting the current of the battery to be measured; namely, the current of the battery to be measured is shunted according to a certain proportion, so that a corresponding current measurement value is obtained.
In one embodiment, as shown in fig. 6, the process of obtaining the current measurement includes:
step S20: and acquiring a current value corresponding to the current in the power supply process of the battery to be tested.
Specifically, the current output by the battery to be tested is constant, so that the actual power supply current of the battery to be tested can be determined by obtaining the current value corresponding to the current of the battery to be tested in the power supply process; the current measurement can then be determined according to the actual requirements.
Step S22: determining the current measurement value at a preset ratio based on the current value.
On the premise of determining the power supply current of the battery to be tested, the current measurement value can be determined based on the current value; specifically, this embodiment is through setting for the predetermined proportion, carries out the reposition of redundant personnel operation with this current value with this predetermined proportion, promptly through obtaining less electric current as this current measurement value, and then the measurement operation of the true capacity value of the battery that is convenient for follow-up going on awaiting measuring.
Wherein, in one embodiment, the current measurement may be obtained by shunting or obtaining the current value, for example, by a shunt.
Step S12: calculating a capacity measurement value of the battery under test based on the current measurement value.
In one embodiment, in order to measure the actual capacity value of the battery to be measured, the corresponding capacity measurement value is obtainedLine calculation; specifically, since the current measurement value is obtained by shunting, in order to ensure that the capacity measurement value can reflect the real capacity value of the battery to be tested, the current measurement value is integrated to obtain the capacity measurement value of the corresponding battery to be tested. I.e. according to a formula
The capacity measurement is calculated, where C is the capacity test value and I is the current, and the calculation is the integral of the current I over the time period t0 to t 1.
Step S14: and amplifying the capacity measurement value according to the reciprocal of a preset proportion to determine the real capacity value of the battery to be measured.
When the current value is shunted, specific shunting operation is carried out according to a preset proportion; after the capacity measurement value is determined in step S12, the capacity measurement value may be amplified, that is, the actual capacity value of the battery to be measured may be determined, so as to implement the measurement operation on the battery to be measured.
Exemplarily, assuming that the corresponding current measurement value is obtained in a preset ratio of 1:10, the current value corresponding to the size of the battery in the power supply process of the battery to be measured can be divided into 10 equal parts, that is, one tenth of the current value is taken as the current measurement value, then the corresponding capacity measurement value is obtained in an integral manner, and finally the capacity measurement value is amplified by the reciprocal of the same preset ratio, so that the real capacity value of the battery to be measured can be obtained.
In another embodiment, after the current measurement value is determined according to the preset ratio, the current measurement values corresponding to N current measurements determined according to the preset ratio are all executed in the steps S12 to S14, the actual capacity values obtained by each calculation are added, and then an average value is calculated, and the average value is used as the actual capacity value of the battery to be measured, so as to improve the measurement accuracy.
It should be noted that, this battery capacity measurement method is unanimous with the principle that battery capacity measurement system realized battery capacity measurement, can combine to understand the utility model discloses the realization is to battery capacity measurement's process and the effect that corresponds and reach.
In summary, the accuracy of the battery capacity measurement can be effectively improved by acquiring the battery measurement value of the preset proportion of the battery to be measured, performing integral calculation on the battery measurement value to obtain the corresponding capacity measurement value, and then amplifying the capacity measurement value based on the reciprocal of the preset proportion.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A battery capacity measurement system, comprising:
the shunt detection module is electrically connected with a battery to be detected and used for performing shunt detection on the current of the battery to be detected according to a preset proportion to obtain a current measurement value reflecting the current of the battery to be detected;
the capacity calculation module is electrically connected with the shunt detection module and used for receiving the current measurement value, and performing integral operation on the current measurement value to obtain a capacity measurement value of the battery to be tested;
and the conversion module is electrically connected with the capacity calculation module and used for receiving the capacity measurement value and amplifying the capacity measurement value according to the reciprocal of the preset proportion to obtain the real capacity value of the battery to be measured.
2. The battery capacity measuring system according to claim 1, wherein the shunt detection module includes a shunt connected in series with the battery under test, the shunt being electrically connected to the capacity calculation module, the shunt detecting a current level of the battery under test based on a built-in detection loop and feeding back a current measurement value to the capacity calculation module based on the current level of the battery under test.
3. The battery capacity measuring system according to claim 2, wherein the shunt has an internal resistance of 75 milliohms with a detection accuracy of 1%.
4. The battery capacity measuring system according to claim 2, wherein the capacity calculating module comprises a capacity monitor electrically connected to the current divider, and configured to receive the current measurement value and obtain a capacity measurement value of the battery to be measured according to an accumulated amount of the current measurement value and time;
the electric quantity monitoring meter is also electrically connected with the battery to be measured and is used for directly measuring the voltage information, the temperature information and the impedance information of the battery to be measured.
5. The battery capacity measuring system according to claim 1, wherein the conversion module includes a transmission unit and a conversion unit, the transmission unit is electrically connected to the capacity calculation module, the conversion unit is electrically connected to the transmission unit, the transmission unit is configured to transmit the capacity measurement value to the conversion unit, and the conversion unit is configured to amplify the capacity measurement value to obtain the actual capacity value of the battery to be measured.
6. The battery capacity measuring system according to claim 5, wherein the conversion unit includes a single chip microcomputer, and the single chip microcomputer is configured to amplify the capacity measurement value according to a reciprocal of the preset ratio to obtain a real capacity value of the battery to be measured, and perform protocol conversion on the real capacity value to obtain a real capacity value conforming to a target communication protocol.
7. The battery capacity measuring system of claim 6, wherein the transmission unit comprises a serial port conversion chip, the serial port conversion chip is electrically connected with the single chip microcomputer, the serial port conversion chip is electrically connected with a target host, and the serial port conversion chip performs data transmission based on a built-in communication protocol and is used for transmitting the real capacity value conforming to the target communication protocol to the target host.
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