CN113466732A - Battery measuring circuit and battery measuring instrument - Google Patents
Battery measuring circuit and battery measuring instrument Download PDFInfo
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- CN113466732A CN113466732A CN202110718499.XA CN202110718499A CN113466732A CN 113466732 A CN113466732 A CN 113466732A CN 202110718499 A CN202110718499 A CN 202110718499A CN 113466732 A CN113466732 A CN 113466732A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
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- 238000005070 sampling Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 36
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000008878 coupling Effects 0.000 description 3
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- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 1
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 1
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
- G01R31/379—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator for lead-acid batteries
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Abstract
The invention discloses a battery measuring circuit and a battery measuring instrument, comprising a plurality of branch measuring circuits and a singlechip; any branch measuring circuit comprises an isolation sampling circuit and an analog-to-digital conversion module; the isolation sampling circuit is connected with the analog-to-digital conversion module, and the analog-to-digital conversion module is connected with the single chip microcomputer; the isolation sampling circuit comprises a front-stage circuit and a rear-stage circuit; the front-stage circuit is provided with an input power supply end, a measurement input end and a grounding end; the rear-stage circuit is provided with an output power supply end and a grounding end; the measurement input end of the preceding stage circuit is connected with the anode of the resistance battery unit to be measured; the grounding end of the preceding stage circuit is connected with the cathode of the resistance battery unit to be tested; the input power supply end of the preceding stage circuit is connected with the anode of the next battery unit of the resistor to be tested; the output power supply end of the rear-stage circuit is connected with the power supply end of the singlechip; the grounding end of the rear-stage circuit is connected with the grounding end of the singlechip. The invention collects a plurality of battery units of the battery pack to be tested at one time, and realizes the high-efficiency detection and maintenance of the battery pack to be tested.
Description
Technical Field
The invention relates to the technical field of battery detection, in particular to a battery measuring circuit and a battery measuring instrument.
Background
The battery pack is an indispensable important component in power generation and related industries, a set of battery pack of a power station is large in size, and a plurality of battery monomers are arranged, however, due to the limit value of the current battery technology, even if each process of the storage battery is subjected to a strict detection program, the voltage, the internal resistance and the capacity of each battery are difficult to be consistent, particularly after the storage battery is used for a period of time, the difference of each battery is increased, and the service life of each storage battery is greatly reduced due to the influence of various factors. Due to the fact that the battery units are numerous, real-time manual monitoring is impossible, and therefore the battery patrol instrument is produced at the right moment.
The battery polling instrument on the market at present essentially conducts and measures each battery unit of the battery pack one by one through various relays, and then disconnects and measures the next battery unit after estimating and measuring the single battery, and the purpose of measuring each battery is achieved by circulating the process. However, the inspection is very slow, and the estimation of the battery cell causes large errors.
Disclosure of Invention
The invention aims to provide a battery measuring circuit and a battery measuring instrument, which can solve the problems that each battery unit of a battery pack needs to be conducted one by one for measurement and the measuring efficiency is low in the prior art.
The purpose of the invention is realized by the following technical scheme:
the invention provides a battery measuring circuit, which comprises a plurality of branch measuring circuits and a singlechip
Any branch measuring circuit comprises an isolation sampling circuit and an analog-to-digital conversion module; the sampling isolating circuit is connected with an analog-digital conversion module, and the analog-digital conversion module is connected with a single chip microcomputer;
the isolation sampling circuit comprises a front-stage circuit and a rear-stage circuit; the preceding stage circuit is provided with an input power supply end, a measurement input end and a grounding end; the rear-stage circuit is provided with an output power supply end and a grounding end;
the measurement input end of the preceding stage circuit is connected with the anode of the resistance battery unit to be measured; the grounding end of the preceding stage circuit is connected with the negative electrode of the resistance battery unit to be tested; the input power supply end of the preceding stage circuit is connected with the anode of the next battery unit of the resistor to be tested;
the output power supply end of the rear-stage circuit is connected with the power supply end of the singlechip; and the grounding end of the rear-stage circuit is connected with the grounding end of the singlechip.
Further, the pre-stage circuit comprises an input power supply, an input stage of the isolation amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor and a third capacitor;
one end of the input power supply is connected with the input power supply end, and the other end of the input power supply is connected with an input power supply pin of the input stage of the isolation amplifier; the measurement input end is connected with one end of a fourth resistor; the other end of the fourth resistor is respectively connected with one end of a fifth resistor and one end of a third resistor; the other end of the fifth resistor is respectively connected with an input stage VINP pin of the isolation amplifier, one end of the third capacitor and one end of the second capacitor; the other end of one end of the third capacitor is connected with one end of the first capacitor; the other end of the third resistor is respectively connected with one end of the first resistor and one end of the second resistor; the other end of the second resistor is connected with an input stage VINN pin of the isolation amplifier; and the ground end of the preceding stage circuit is respectively connected with the other end of the first resistor, the other end of the first capacitor, the other end of the second capacitor and the ground pin of the input stage of the isolation amplifier.
Further, the post-stage circuit comprises an output stage of the isolation amplifier, an operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a fourth capacitor;
an output power supply pin of an output stage of the isolation amplifier is connected with a power supply of the single chip microcomputer; a VOUTP pin of an output stage of the isolation amplifier is connected with one end of a sixth resistor; the other end of the sixth resistor is connected with one end of the seventh resistor and one end of the fourth capacitor respectively; the other end of the seventh resistor is connected with a non-inverting input pin of the operational amplifier and one end of an eleventh resistor; a VOUTN pin of an output stage of the isolation amplifier is connected with one end of the eighth resistor; the other end of the eighth resistor is connected with the other end of the fourth capacitor and one end of the ninth resistor respectively; the other end of the ninth resistor is connected with an inverting input pin of the operational amplifier and one end of the tenth resistor respectively; the ground pin of the output stage of the isolation amplifier is respectively connected with the other end of the tenth resistor and the ground of the singlechip; the output end pin of the operational amplifier is respectively connected with the other end of the eleventh resistor and one end of the twelfth resistor; the other end of the twelfth resistor is connected with the input end of the analog-to-digital conversion module N; and the output end of the analog-to-digital conversion module N is connected with the singlechip.
Further, the voltage difference value between the VINN pin and the VINP pin of the input stage of the isolation amplifier is-250 mV.
Further, the isolation amplifier fixes a gain of 8 times.
The invention also provides a battery measuring instrument, and the measuring circuit of the battery measuring instrument is the battery measuring circuit.
The invention has the beneficial effects that:
the invention adopts the operational amplifier isolation technology and the connection method of the multi-point ground wire and the power connection source of the preceding stage circuit, simultaneously detects each battery unit of the battery pack to be detected on the premise of ensuring the relative isolation and stability of the ground wire and the power line, monitors the voltage of each battery unit in real time, realizes the voltage fluctuation detection of the discharge of each battery unit of the whole battery pack and the accurate estimation of the relevant parameters of the battery, has great significance for the maintenance of the battery pack, and simultaneously greatly improves the detection efficiency of the battery pack.
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 the drawings without creative efforts.
FIG. 1 is a schematic diagram of a battery measurement circuit according to the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Referring to fig. 1, an embodiment of the present invention provides a battery measurement circuit, which includes a plurality of branch measurement circuits and a single chip microcomputer;
any branch measuring circuit comprises an isolation sampling circuit and an analog-to-digital conversion module; the isolation sampling circuit is connected with an analog-to-digital conversion module, and the analog-to-digital conversion module is connected with the single chip microcomputer;
the isolation sampling circuit comprises a front-stage circuit and a rear-stage circuit; the preceding stage circuit is provided with an input power supply end, a measurement input end and a grounding end; the rear-stage circuit is provided with an output power supply end and a grounding end;
the measurement input end of the preceding stage circuit is connected with the anode of the resistance battery unit to be measured; the grounding end of the preceding stage circuit is connected with the negative electrode of the resistance battery unit to be tested; the input power supply end of the preceding stage circuit is connected with the anode of the next battery unit of the resistor to be tested;
the output power supply end of the rear-stage circuit is connected with the power supply end of the singlechip; and the grounding end of the rear-stage circuit is connected with the grounding end of the singlechip.
The battery pack to be tested is divided into a first battery unit N, a second battery unit N +1 and a third battery unit N +2 … … (N + 1) th battery unit N + N, wherein N is a positive integer, and the first battery unit N, the second battery unit N +1 and the third battery unit N +2 … … (N + 1) th battery unit N + N are connected in series; the positive electrode of the first battery unit N is coupled with the negative electrode of the second battery unit N +1, the positive electrode of the second battery unit N +1 is coupled with the negative electrode of the third battery unit N +2, and the like;
the anode of a first battery unit N of the battery pack to be tested is connected with the measurement input terminal BAT of the first preceding stage circuit NNThe negative pole of the first battery unit N is connected with the ground end GND of the first preceding stage circuit NN(ii) a The positive electrodes of a second battery unit N +1 of the battery pack to be tested are respectively connected with the measurement input terminal BAT of a second preceding stage circuit N +1N+1And an input power supply terminal VCC of the first preceding stage circuit NNThe cathode of the second battery unit N +1 is connected with the ground GND of the second preceding circuit N +1N+1(ii) a The positive electrodes of the third battery unit N +2 of the battery pack to be tested are respectively connected with the measurement input terminal BAT of the third preceding stage circuit N +2N+2And an input power supply terminal VCC of the second preceding stage circuitN+1The negative electrode of the third battery unit N +2 is connected with the ground end GND of the third preceding stage circuit N +2N+2(ii) a Therefore, the connection design circuit of the nth preceding stage circuit N + N and the battery pack to be tested is the connection design mode, and is not described herein again;
the output ends of the first post-stage circuit N and the second post-stage circuit N +1 … …, the N +1 th post-stage circuit N + N are respectively connected with the corresponding first analog-to-digital conversion modules ADNA second analog-to-digital conversion module ADN+1… … (n + 1) th analog-to-digital conversion module ADN+n(ii) a In the specific implementation process, any one analog-to-digital conversion circuit is connected with the single chip microcomputer; the output power supply ends of the first post-stage circuit N and the second post-stage circuit N +1 … …, the N +1 th post-stage circuit N + N are respectively connected with the power supply end VCC of the singlechip; and the grounding ends of the first rear-stage circuit N and the second rear-stage circuit N +1 … …, the N +1 th rear-stage circuit N + N are respectively connected with the grounding end of the single chip microcomputer. It is easy to find that each post-stage circuit is connected with a corresponding analog-to-digital conversion module, and each analog-to-digital conversion module is the same.
Further, in a preferred embodiment of the present application, the first pre-stage circuit N includes an input power supply N, an input stage N of an isolation amplifier, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, and a third capacitor C3;
one end of the input power supply N is connected with the input power supply end VCCNThe other end of the input power supply pin is connected with an input power supply pin VDD1 of an input stage of the isolation amplifier; the measurement input terminal BATNOne end of a fourth resistor R4 is connected; the other end of the fourth resistor R4 is respectively connected with one end of a fifth resistor R5 and one end of a third resistor R3; the other end of the fifth resistor R5 is respectively connected with an input stage VINP pin of the isolation amplifier, one end of a third capacitor C3 and one end of a second capacitor C2; the other end of one end of the third capacitor C3 is connected with one end of the first capacitor C1; the other end of the third resistor R3 is respectively connected with one end of the first resistor R1 and one end of the second resistor R2; the other end of the second resistor R2 is connected with an input stage VINN pin of the isolation amplifier; a ground terminal GND of the first preceding stage circuit NNThe other end of the first resistor R1, the other end of the first capacitor C1, the other end of the second capacitor C2, and the ground pin GND1 of the input stage N of the isolation amplifier are connected, respectively.
In a preferred embodiment of the present application, the first post-stage circuit N includes an output stage N of an isolation amplifier, an operational amplifier U1, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a fourth capacitor C4;
an output power supply pin VDD2 of an output stage N of the isolation amplifier is connected with a power supply VCC of the singlechip; a VOUTP pin of an output stage N of the isolation amplifier is connected with one end of a sixth resistor R6; the other end of the sixth resistor R6 is respectively connected with one end of a seventh resistor R7 and one end of a fourth capacitor C4; the other end of the seventh resistor R7 is connected with a non-inverting input pin of an operational amplifier U1 and one end of an eleventh resistor R11; a VOUTN pin of an output stage N of the isolation amplifier is connected with one end of an eighth resistor R8; the other end of the eighth resistor R8The other end of the fourth capacitor C4 and one end of a ninth resistor R9 are respectively connected; the other end of the ninth resistor R9 is respectively connected with the inverting input pin of the operational amplifier U1 and one end of the tenth resistor R10; the ground pin of the output stage N of the isolation amplifier is respectively connected with the other end of the tenth resistor R10 and the ground of the singlechip; an output terminal pin of the operational amplifier U1 is respectively connected with the other end of the eleventh resistor R11 and one end of the twelfth resistor R12; the other end of the twelfth resistor R12 is connected with an analog-to-digital conversion module ADNAn input terminal of (1); the analog-to-digital conversion module ADNThe output end of the single-chip microcomputer is connected with the single-chip microcomputer.
It should be noted that the types of the connected circuit components in all the front-stage circuits and the rear-stage circuits are the same.
In a specific implementation, the voltage difference between the VINN pin and the VINP pin of the input stage of the isolation amplifier is-250 mV to 250 mV. The following formula can be derived:
wherein VINP-NAnd VbatRespectively representing the input voltage of the isolation amplifier and the voltage of the battery to be tested. Wherein V is less than or equal to-250 mVINP-N≤250mV。
Preferably, the isolation amplifier fixes a gain of 8 times. And has the following components:
VOUTP-N＝8VINP-N
wherein VOUTP-NRepresenting the output voltage of the isolation amplifier. In order to realize the difference operation better, let R7 ═ R9, R10 ═ R11, and R6 ═ R8, finally:
above VADNFor the analog-to-digital conversion module ADNThe voltage value of (2).
The embodiment of the invention also provides a battery measuring instrument, and the measuring circuit of the battery measuring instrument is the battery measuring circuit.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units 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 units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.
Claims (6)
1. A battery measuring circuit is characterized by comprising a plurality of branch measuring circuits and a single chip microcomputer;
any branch measuring circuit comprises an isolation sampling circuit and an analog-to-digital conversion module; the isolation sampling circuit is connected with an analog-to-digital conversion module, and the analog-to-digital conversion module is connected with the single chip microcomputer;
the isolation sampling circuit comprises a front-stage circuit and a rear-stage circuit; the preceding stage circuit is provided with an input power supply end, a measurement input end and a grounding end; the rear-stage circuit is provided with an output power supply end and a grounding end;
the measurement input end of the preceding stage circuit is connected with the anode of the resistance battery unit to be measured; the grounding end of the preceding stage circuit is connected with the negative electrode of the resistance battery unit to be tested; the input power supply end of the preceding stage circuit is connected with the anode of the next battery unit of the resistor to be tested;
the output power supply end of the rear-stage circuit is connected with the power supply end of the singlechip; and the grounding end of the rear-stage circuit is connected with the grounding end of the singlechip.
2. The battery measurement circuit of claim 1, wherein the pre-stage circuit comprises an input power supply, an input stage of an isolation amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, and a third capacitor;
one end of the input power supply is connected with the input power supply end, and the other end of the input power supply is connected with an input power supply pin of the input stage of the isolation amplifier; the measurement input end is connected with one end of a fourth resistor; the other end of the fourth resistor is respectively connected with one end of a fifth resistor and one end of a third resistor; the other end of the fifth resistor is respectively connected with an input stage VINP pin of the isolation amplifier, one end of the third capacitor and one end of the second capacitor; the other end of one end of the third capacitor is connected with one end of the first capacitor; the other end of the third resistor is respectively connected with one end of the first resistor and one end of the second resistor; the other end of the second resistor is connected with an input stage VINN pin of the isolation amplifier; and the ground end of the preceding stage circuit is respectively connected with the other end of the first resistor, the other end of the first capacitor, the other end of the second capacitor and the ground pin of the input stage of the isolation amplifier.
3. The battery measurement circuit according to claim 1, wherein the post-stage circuit comprises an output stage of an isolation amplifier, an operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, and a fourth capacitor;
the output power supply end of the output stage of the isolation amplifier is connected with the power supply end of the singlechip; a VOUTP pin of an output stage of the isolation amplifier is connected with one end of a sixth resistor; the other end of the sixth resistor is connected with one end of the seventh resistor and one end of the fourth capacitor respectively; the other end of the seventh resistor is connected with a non-inverting input pin of the operational amplifier and one end of an eleventh resistor; a VOUTN pin of an output stage of the isolation amplifier is connected with one end of the eighth resistor; the other end of the eighth resistor is connected with the other end of the fourth capacitor and one end of the ninth resistor respectively; the other end of the ninth resistor is connected with an inverting input pin of the operational amplifier and one end of the tenth resistor respectively; the ground pin of the output stage of the isolation amplifier is respectively connected with the other end of the tenth resistor and the grounding end of the singlechip; the output end of the operational amplifier is respectively connected with the other end of the eleventh resistor and one end of the twelfth resistor; the other end of the twelfth resistor is connected with the input end of the analog-to-digital conversion module; the output end of the analog-to-digital conversion module is connected with the single chip microcomputer.
4. The battery measurement circuit of claim 2, wherein the voltage difference between the VINN pin and the VINP pin of the input stage of the isolation amplifier is-250 mV to 250 mV.
5. A battery measurement circuit according to claim 2 or 3, wherein the isolation amplifier fixes a gain of eight.
6. A battery gauge, wherein the measurement circuit of the battery gauge is the battery measurement circuit of any one of claims 1 to 5.
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