CN105954592A - Power battery pack internal resistance measurement system - Google Patents
Power battery pack internal resistance measurement system Download PDFInfo
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- 238000005259 measurement Methods 0.000 title claims abstract description 92
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The invention provides a power battery pack internal resistance measurement system, which comprises a measurement loop and an internal resistance measurement unit. The measurement loop comprises a battery pack to be measured. The internal resistance measurement unit is used for measuring the voltage frequency signal and current frequency signal of the battery pack to be measured, and carrying out calculation based on the voltage frequency signal and the current frequency signal to obtain AC internal resistance of the battery pack to be measured. The power battery pack internal resistance measurement system can realize measurement and calculation of the internal resistance of the battery pack, and provides reference basis for knowing state information and work condition of the battery pack in real time.
Description
Technical Field
The invention relates to the technical field of internal resistance measurement, in particular to an internal resistance measurement system of a power battery pack.
Background
At present, in the application field of power battery packs, such as new energy vehicles, hybrid vehicles, electric trains, electric bicycles and the like, and the energy field of marine equipment, underwater weapons and the like, energy storage units consisting of various types of batteries are needed; in the using process of the power battery, in order to facilitate the management of a battery system, the internal resistance of the battery needs to be known so as to know the state information and the working condition of the battery pack in time and provide guarantee for keeping the battery in a good state to work; there has not been an apparatus or system in the prior art that can effectively perform the measurement of the internal resistance of the battery.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a power battery internal resistance measurement system to solve the above problems.
First, in a first aspect, an embodiment of the present invention provides a power battery internal resistance measurement system, including:
a measuring loop and an internal resistance measuring unit;
the measurement loop comprises a battery pack to be measured;
the internal resistance measuring unit is used for measuring a voltage frequency signal and a current frequency signal of the battery pack to be measured and calculating the alternating current internal resistance of the battery pack to be measured according to the voltage frequency signal and the current frequency signal.
With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where:
the system further comprises: and the battery monitoring unit is used for monitoring the voltage and the temperature of the single battery in the battery pack.
With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, where:
the system, still include: an internal communication unit;
the internal communication unit is used for realizing the internal communication between the battery monitoring unit and the internal resistance measuring unit.
With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where:
the internal resistance measuring unit includes: a pre-circuit, a filter and an amplifier;
the pre-circuit, the filter and the amplifier cooperate to extract a voltage frequency signal and a current frequency signal of the measurement loop battery pack and compress a noise signal.
With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where:
the internal resistance measuring unit further includes: the first processor is connected with the driving amplifier;
and the first processor controls the voltage frequency signal and the current frequency signal to be sampled and calculated, and calculates the alternating current internal resistance of the battery pack to be tested according to the voltage frequency signal and the current frequency signal.
With reference to the first aspect, an embodiment of the present invention provides a fifth possible implementation manner of the first aspect, where:
the front-end circuit includes: a signal coupler;
the first processor sends out a resistance measurement signal, the resistance measurement signal is subjected to signal amplification through the driving amplifier, the resistance measurement signal after the signal amplification is transmitted to the signal coupler, and the resistance measurement signal is transmitted to the measurement loop through the signal coupler.
With reference to the first aspect, an embodiment of the present invention provides a sixth possible implementation manner of the first aspect, where:
the intercom unit includes: a communication processing circuit;
the internal communication unit digitally synthesizes the sent communication signals through the processor to generate corresponding frequency signals, then superposes all the frequency signals, and sends the superposed frequency signals to the measurement loop through the signal coupler after the superposed frequency signals are amplified by the driving amplifier to realize the sending of the communication signals;
the internal communication unit respectively extracts communication signals with different frequencies through the signal coupler, the front-end circuit, the filter and the amplifier, then the communication processing circuit converts the frequency signals into serial digital signals or parallel digital signals, and then the other processor receives the digital signals to realize the receiving of the communication signals; or directly collecting the output signal of the amplifier by another processor, and obtaining the communication signal through calculation to realize the communication signal receiving.
With reference to the first aspect, an embodiment of the present invention provides a seventh possible implementation manner of the first aspect, where:
the first processor is also connected with an isolation communication element, and the first processor is in communication connection with the system external equipment through the isolation communication element.
With reference to the first aspect, an embodiment of the present invention provides an eighth possible implementation manner of the first aspect, where:
the isolated communication element includes: CAN/485 communication interface.
With reference to the first aspect, an embodiment of the present invention provides a ninth possible implementation manner of the first aspect, where:
the measurement circuit further comprises:
the circuit comprises a first capacitor, a first inductor, a second capacitor and a second inductor, wherein a branch circuit formed by connecting the first capacitor and the first inductor in series is connected in parallel with a branch circuit formed by connecting the second capacitor and the second inductor in series; at the moment, the measuring loop is used for realizing internal resistance measurement and internal communication;
or,
the measurement circuit further comprises: the inductor, the capacitor and the switch form a series circuit, and at the moment, the communication is carried out through the electric equipment which is connected in parallel at two ends of the series circuit formed by the inductor, the capacitor and the switch.
According to the internal resistance measuring system of the power battery pack, the voltage frequency signal and the current frequency signal of the battery pack to be measured are measured through the measuring unit, and the alternating current resistance of the battery pack to be measured is obtained through calculation according to the voltage frequency signal and the current frequency signal.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram illustrating a system for measuring internal resistance of a power battery pack according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram illustrating a system for measuring internal resistance of a power battery pack according to a second embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a power battery internal resistance measurement system according to a third embodiment of the present invention.
FIG. 4 is a schematic structural diagram illustrating a system for measuring internal resistance of a power battery pack according to a fourth embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a power battery internal resistance measurement system according to a fifth embodiment of the present invention.
Illustration of the drawings:
110-measurement loop; 120-an internal resistance measuring unit; 130-an internal communication unit; 140. a battery monitoring unit;
100-a battery pack to be tested; 101-a first capacitance; 102-a first inductance; 103-a second capacitance; 104-a second inductance; 107-capacitance; 108-an inductance; 105-a switch; 207-a first processor; 307-a second processor; 201-a first signal coupler; 202-a second signal coupler; 203-a communication receiving coupling coil; 204-internal resistance measuring receiving coupling coil; 301-a third signal coupler; 302-a fourth signal coupler; 209-isolating the communication element.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
At present, in the application process of a power battery pack, in order to facilitate management and monitoring of a battery system, the internal resistance of a battery needs to be known so as to know the state information and the working condition of the battery pack in time; in view of the above, an embodiment of the present invention provides a system for measuring internal resistance of a power battery pack to solve the above problem.
In the embodiment shown in fig. 1, the present embodiment provides a power battery internal resistance measurement system, which includes:
a measurement circuit 110 and an internal resistance measurement unit 120;
the measurement circuit 110 includes a battery pack to be measured;
the internal resistance measuring unit 120 is configured to measure a voltage frequency signal and a current frequency signal of the battery pack to be tested, and calculate an ac internal resistance of the battery pack to be tested according to the voltage frequency signal and the current frequency signal.
The internal resistance measurement system of the power battery pack in the embodiment can realize measurement of the internal resistance of the battery pack, and provides a basis for solving the service state information of the power battery pack.
In reality, two key factors for measuring the working state of the battery pack are that one is temperature and the other is voltage; therefore, as shown in the embodiment shown in fig. 2, the power battery internal resistance measurement system provided in this embodiment further includes: the battery monitoring unit 140 and the internal communication unit 130, the battery monitoring unit 140 is used for monitoring the voltage and the temperature of the battery cells in the battery pack, and the internal communication unit 130 is used for realizing the internal communication between the battery monitoring unit 140 and the internal resistance measuring unit in the system.
It should be noted that the embodiment of fig. 2 only illustrates the connection status between one of the battery monitoring units 140 and the internal resistance measuring unit, the internal communication unit, and the measurement circuit, and the practical application is not limited thereto.
As shown in the embodiment of fig. 3, the internal resistance measurement system of a power battery pack provided in this embodiment includes a measurement loop, an internal resistance measurement unit, a battery monitoring unit, and an internal communication unit, where the measurement loop includes a battery pack to be measured, the internal resistance measurement unit is configured to measure a voltage frequency signal and a current frequency signal of the battery pack to be measured, and calculate an ac internal resistance of the battery pack to be measured according to the voltage frequency signal and the current frequency signal, and the internal communication unit is configured to implement internal communication of the entire system.
The internal resistance measuring unit includes: a pre-circuit, a filter and an amplifier; the pre-circuit, the filter and the amplifier cooperate with each other to extract a voltage frequency signal and a current frequency signal of the battery pack of the measurement loop and compress the noise signal.
The internal resistance measuring unit further includes: a first processor; the first processor controls sampling and calculation of the voltage frequency signal and the current frequency signal, and calculates and obtains the alternating current internal resistance of the battery pack to be tested according to the voltage frequency signal and the current frequency signal; the first processor is also connected with a driving amplifier; the driving amplifier is used for carrying out signal amplification processing on the output signal of the first processor.
The front-end circuit includes: a signal coupler; the signal coupler is connected with the measuring loop, the first processor sends out a resistance measuring signal, the resistance measuring signal is subjected to signal amplification through the driving amplifier, the resistance measuring signal after the signal amplification is transmitted to the signal coupler, and the resistance measuring signal is transmitted (or coupled) to the measuring loop through the signal coupler.
Further, as shown in fig. 3, in the present embodiment, a battery monitoring unit is taken as an example for description, wherein the internal resistance measuring unit includes: the first processor 207, the battery monitoring unit includes: a second process 307; it should be noted that the number of the battery cells in the battery pack is plural, and therefore, in practical application, the number of the battery monitoring units may also be plural, and this embodiment only takes one battery monitoring unit as an example to introduce the internal communication between the battery monitoring unit and the internal resistance measuring unit.
Further, the measurement circuit comprises: the system comprises a battery pack to be tested 100, a first capacitor 101, a first inductor 102, a second capacitor 103 and a second inductor 104, wherein a branch circuit formed by connecting the first capacitor 101 and the first inductor 102 in series is connected in parallel with a branch circuit formed by connecting the second capacitor 103 and the second inductor 104 in series, and a switch 105 is further arranged on the branch circuit formed by connecting the second capacitor 103 and the second inductor 104 in series; furthermore, a plurality of signal couplers are connected in the measuring loop; the switch 105 needs to be closed when the internal resistance measurement is performed.
For the sake of detailed description, the plurality of couplers are divided into: a first signal coupler 201, a second signal coupler 202, a third signal coupler 301, and a fourth signal coupler 302; it should be noted that, this is only an example, and the number of the signal couplers in the practical implementation process of the present solution is not limited thereto, so the above division manner cannot be regarded as a limitation to the technical solution of the present application.
In the process of measuring the internal resistance of the battery pack, first, the first processor 207 sends a resistance measurement signal, the resistance measurement signal is subjected to signal amplification through the driving amplifier, the resistance measurement signal subjected to signal amplification drives the first signal coupler 201, and the signal is coupled to the measurement loop through the first signal coupler 201; the preamplifier connected to the battery pack 100 to be tested and the preamplifier connected to the second signal coupler 202 perform pre-processing on the signals, and then the signals are processed by respective filters and amplifiers to finally obtain voltage frequency signals and current frequency signals.
When the signal coupler is actually used, a traditional signal coupler can be adopted, or a signal coupler in a structural form that the signal coupler comprises two open coils and the open coils are connected through a buckle can be adopted, and further, the signal coupler made of soft magnetic materials can be used, and details are not repeated; preferably, a signal coupler with an operating signal frequency between 500 hz and 50 mhz is used in this embodiment.
In the measuring loop, the impedance value of the lead is a fixed value, and the relationship between the magnitude of the current frequency signal and the internal resistance of the battery conforms to the following formula:
in the above formula, R is the AC internal resistance of the battery pack, U is the AC voltage, I is the AC current, RL is the line impedance,is a series resonant impedance;
when the alternating voltage U is fixed, the current frequency signal is in a proportional relation with the loop impedance of the loop where the battery pack is located, and therefore the alternating current internal resistance of the battery pack can be accurately measured by using the formula.
The power battery pack internal resistance measuring system provided in the above embodiment adopts the relatively low-price front-end circuit, the filter and the amplifier to extract the voltage frequency signal and the current frequency signal, so as to measure the internal resistance of the battery pack; the method has the advantages of rapid signal extraction, accurate measurement and low cost.
It should be noted that the battery described in this embodiment refers to an energy storage device, and includes a lead-acid battery, a lithium battery, a super capacitor, and other types of energy storage devices.
The internal resistance measuring system is not only suitable for measuring the internal resistance of the power battery pack, but also can be applied to measuring the internal resistance of other electrical components with resistance, such as capacitors and the like, so that the application of the technical scheme in other identical or similar technical fields is covered in the protection range of the invention.
When a plurality of battery monitoring units are arranged, the requirement that communication CAN be carried out between each battery monitoring unit and the internal resistance measuring unit is met, but in the existing battery pack management subsection measuring system, the internal communication is carried out by adopting an isolated CAN bus, in such a way, the CAN bus is required to be adopted to connect voltage and temperature measuring equipment of each battery monomer, the defects of long measuring lead, excessive bus, overstaffed circuit, complex wiring and the like are often caused, and the reliability and the simplicity of the system are influenced.
In the battery pack internal resistance measurement system provided by the embodiment of the invention, communication transmission can be realized by using the power battery pack measurement loop as a conductor, namely, the measurement loop in the embodiment can be used for measuring the internal resistance of the battery pack and also can be used for realizing internal communication between processors in the system, and the measurement loop can be regarded as transmission by one wire in a macroscopic view;
the above-mentioned intercom unit includes: a communication processing circuit;
in the process of communication, taking the communication from the first processor to the second processor as an example, the internal communication unit digitally synthesizes the transmitted communication signals through the first processor 207, generates corresponding frequency signals, superimposes all the frequency signals, amplifies the frequency signals through the driving amplifier, and transmits the superimposed frequency signals to the measurement loop through the first signal coupler 201 to realize the transmission of the communication signals;
the internal communication unit extracts communication signals with different frequencies through the fourth signal coupler 302, the front-end circuit, the filter and the amplifier respectively, then the communication processing circuit converts the frequency signals into serial digital signals or parallel digital signals, and the second processor 307 receives the digital signals to realize the receiving of the communication signals; or the second processor directly collects the output signal of the amplifier and obtains the communication signal through calculation, so that the communication signal is received.
Further, taking two communication signals as an example, the scheme is as follows:
taking the first processor 207 as an example, first, the first processor 207 transmits the communication frequency signal f1Sum frequency signal f2To the driver amplifier, the communication frequency signal f is also processed by the driver amplifier1Sum frequency signal f2Performing signal amplification processing, and driving the amplifier to amplify the communication frequency signal f1Sum frequency signal f2The signal is transmitted to the first signal coupler 201, the first signal coupler 201 further couples the signal to the measurement loop, the measurement loop is used as a communication loop, the signal is pre-processed by the preamplifier connected with the fourth signal coupler 302, and then the signal is processed by the filter and the amplifier to obtain the frequency signal f1Sum frequency signal f2At this time, the second processor 307 processes the frequency signal f through the analog-to-digital converter1Sum frequency signalNumber f2Sampling to obtain digital frequency signal f1And a digital frequency signal f2The continuous signal is changed into a digital signal, and further, the digital frequency signal f can be processed by a communication processing circuit1And a digital frequency signal f2And generating a serial digital signal or a parallel digital signal, transmitting the serial digital signal or the parallel digital signal to the second processor, or directly acquiring an output signal of the preamplifier by the second processor, obtaining a communication signal through calculation, receiving the communication signal, and further realizing digital communication between the first processor and the second processor.
It should be noted that, the above is only exemplified by the frequency signal f1 and the frequency signal f2, but in practical application, the frequency signal is not limited to only the frequency signal f1 and the frequency signal f2, and may be a plurality of frequency signals; if the processor adopts multi-frequency signal transmission, the communication processing circuit can be omitted, and the processor acquires and calculates the multi-frequency signal to obtain a corresponding communication signal; therefore, the content of the foregoing embodiments should not be construed as limiting the technical solutions of the present application.
Each processor can communicate with each other, for example, the second processor can also send a communication frequency signal f1Sum frequency signal f2Digital communication is conducted in a direction from the second processor to the first processor.
The battery monitoring unit in the above embodiment is configured to measure the voltage and/or the temperature of the battery cells of the battery pack, where the voltage measurement may satisfy the requirement of performing voltage equalization management between the battery cells in the battery pack, and may be performed, for example, in the following manners: and calculating the average voltage of the battery monomer, and performing resistance discharge on the battery monomer exceeding a certain value of the average voltage until the voltage of the battery monomer is reduced to a specified value, and then disconnecting the resistance discharge to realize battery voltage balance management.
Further, the above battery management unit may also be implemented by: the chip is realized by LTC8403, LTC8404, AD7280 and the like.
The above-mentioned temperature measurement to the battery monomer carries out, can carry out effective monitoring to the security in the battery use, can indicate when the temperature exceedes the early warning value, prevents that the battery from appearing spontaneous combustion phenomenon such as spontaneous explosion because of the high temperature.
As shown in fig. 4, the fourth embodiment, the measurement circuit in this embodiment includes: the measurement loop is used for measuring the internal resistance of the battery pack, and at the moment, the measurement loop is communicated through electric equipment connected in parallel at two ends of the series circuit consisting of the inductor, the capacitor and the switch, namely the measurement loop consisting of the switch, the inductor and the capacitor is used for measuring the internal resistance of the battery pack; the internal communication of the whole system is realized by utilizing a communication loop comprising a load.
As shown in fig. 5, in the fifth embodiment, on the basis of the fourth embodiment, in order to distinguish the internal resistance measurement and the communication, the coil of the second signal coupler is divided into the internal resistance measurement receiving coupling coil 204 and the communication receiving coupling coil 203, and then the circuit such as the preamplifier is connected to realize the internal resistance measurement and the internal communication of the battery pack.
In the third embodiment, in the communication process, a measurement loop formed by the first capacitor, the first inductor, the second capacitor and the second inductor is used as a communication loop; in the fourth and fifth embodiments, in order to make the system simpler, the first capacitor, the first inductor, the second capacitor and the second inductor are omitted when only internal communication is required, and a communication loop formed by loads (such as an engine and other electrical equipment) connected in parallel at two ends of the inductor and capacitor series loop is adopted, so that the communication system is simpler.
In addition, in the present application, the first processor, the second processor and the peripheral circuits thereof may be implemented by an integrated chip.
In the system for measuring the internal resistance of the power battery pack provided by the embodiment of the invention, the measurement of the internal resistance of the battery can be realized, and the system also has the following advantages:
1. and the voltage equalization management of the single batteries in the battery pack and the safety monitoring management of the battery pack are realized.
2. The power battery is used as a conductor to realize communication (or a measurement loop is used as a communication loop), so that the isolation problem is solved, the use of a CAN bus is avoided, the measurement and communication lines are greatly reduced, and the lines are neat;
3. the wiring is simple, the workload of later maintenance and overhaul is small, and the cost is reduced;
4. the reliability of the power battery pack internal resistance measuring system is greatly improved.
Further, the first processor in the above embodiments is also connected to the isolated communication component 209, and the processor is communicatively connected to the external device of the present system through the isolated communication component 209.
The data collected by the second processor can be transmitted to the first processor through the internal communication unit, and further transmitted to system external equipment, such as equipment such as an upper computer and the like, through the isolation communication element by the first processor.
In one embodiment, preferably, the isolated communication element includes: CAN/485 communication interface.
It should be noted that the scheme of the present application is only to describe how to implement the measurement of the internal resistance of the battery pack, the structure for implementing the internal communication of the internal resistance measurement system of the battery pack, and the method for implementing the measurement of the internal resistance of the battery pack and the internal communication based on the structure, and the schemes for adjusting the internal resistance measurement system of the battery pack based on the structure, such as adding a multistage filter, adding a protection circuit or other auxiliary circuits, etc., to implement better performance and functions, or performing the post-processing of the calculation method based on the calculation data of the present invention to implement the residual capacity of the battery pack, and allowing the calculation of parameters of the charge-discharge power, the residual life, etc., are all within the protection.
In addition, the communication method adopted by the internal communication unit of the invention is suitable for a frequency modulation (FSK) communication mode, and can also adopt a phase modulation (PSK) mode to realize communication, or a multi-carrier frequency communication mode (FDM) and an orthogonal multi-carrier frequency communication mode (OFDM), and the communication modulation mode and the corresponding circuit which are extended on the basis are all in the protection scope of the invention.
It should be noted that in the description of the embodiments of the invention, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connecting" are to be interpreted broadly, and may be, for example, electrically connected, directly connected, indirectly connected through an intermediate medium, or communicated between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The functions performed by the system may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing an embedded computer device (which may also be a 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 invention. 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 other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A power battery pack internal resistance measurement system, comprising: a measuring loop and an internal resistance measuring unit;
the measurement loop comprises a battery pack to be measured;
the internal resistance measuring unit is used for measuring a voltage frequency signal and a current frequency signal of the battery pack to be measured and calculating the alternating current internal resistance of the battery pack to be measured according to the voltage frequency signal and the current frequency signal.
2. The power battery internal resistance measurement system according to claim 1, further comprising: and the battery monitoring unit is used for monitoring the voltage and the temperature of the single battery in the battery pack.
3. The power battery internal resistance measurement system according to claim 2, further comprising: an internal communication unit;
the internal communication unit is used for realizing the internal communication between the battery monitoring unit and the internal resistance measuring unit.
4. The power battery pack internal resistance measurement system according to claim 3, wherein the internal resistance measurement unit includes: a pre-circuit, a filter and an amplifier;
the pre-circuit, the filter and the amplifier cooperate to extract a voltage frequency signal and a current frequency signal of the measurement loop battery pack and compress a noise signal.
5. The power battery pack internal resistance measurement system according to claim 4, wherein the internal resistance measurement unit further includes: the first processor is connected with the driving amplifier;
and the first processor controls the voltage frequency signal and the current frequency signal to be sampled and calculated, and calculates the alternating current internal resistance of the battery pack to be tested according to the voltage frequency signal and the current frequency signal.
6. The power battery internal resistance measurement system of claim 5, wherein the front-end circuit comprises: a signal coupler;
the first processor sends out a resistance measurement signal, the resistance measurement signal is subjected to signal amplification through the driving amplifier, the resistance measurement signal after the signal amplification is transmitted to the signal coupler, and the resistance measurement signal is transmitted to the measurement loop through the signal coupler.
7. The power battery internal resistance measurement system according to claim 6, wherein the internal communication unit includes: a communication processing circuit;
the internal communication unit digitally synthesizes the sent communication signals through the processor to generate corresponding frequency signals, then superposes all the frequency signals, amplifies the frequency signals through the driving amplifier, and sends the superposed frequency signals to the measurement loop through the signal coupler to realize the sending of the communication signals;
the internal communication unit respectively extracts communication signals with different frequencies through the signal coupler, the front-end circuit, the filter and the amplifier, then the communication processing circuit converts the frequency signals into serial digital signals or parallel digital signals, and then the other processor receives the digital signals to realize the receiving of the communication signals; or directly collecting the output signal of the amplifier by another processor, and obtaining the communication signal through calculation to realize the communication signal receiving.
8. The power battery internal resistance measurement system of claim 5, wherein the first processor is further connected to an isolation communication element, and the first processor is communicatively connected to the system external device through the isolation communication element.
9. The power battery internal resistance measurement system of claim 8, wherein the isolation communication element comprises: CAN/485 communication interface.
10. The system for measuring and communicating the internal resistance of the power battery according to claim 3, wherein the measuring circuit further comprises:
the circuit comprises a first capacitor, a first inductor, a second capacitor and a second inductor, wherein a branch circuit formed by connecting the first capacitor and the first inductor in series is connected in parallel with a branch circuit formed by connecting the second capacitor and the second inductor in series; at the moment, the measuring loop is used for realizing internal resistance measurement and internal communication;
or,
the measurement circuit further comprises: the inductor, the capacitor and the switch form a series circuit, and at the moment, the communication is carried out through the electric equipment which is connected in parallel at two ends of the series circuit formed by the inductor, the capacitor and the switch.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108152753A (en) * | 2017-12-30 | 2018-06-12 | 天津华庆百胜能源有限公司 | A kind of method that accumulator internal resistance is detected by inductance capacitance discharged in series |
| CN109444598A (en) * | 2018-11-30 | 2019-03-08 | 广东电网有限责任公司 | A kind of performance test methods of supercapacitor |
| WO2020106043A1 (en) * | 2018-11-23 | 2020-05-28 | 주식회사 엘지화학 | Battery monitoring system |
| CN111213063A (en) * | 2017-10-16 | 2020-05-29 | 尼亚布科知识产权控股有限责任公司 | Battery monomer monitoring system |
| US20210172905A1 (en) * | 2018-01-04 | 2021-06-10 | Lyten, Inc. | Sensing device for detecting analytes in batteries |
| CN113906301A (en) * | 2020-04-28 | 2022-01-07 | 旻泰克科技股份有限公司 | Battery current dynamic inspection system and method |
| CN114061793A (en) * | 2021-12-17 | 2022-02-18 | 中国电信股份有限公司 | Calibration device and calibration method for temperature sensor |
| CN116331060A (en) * | 2023-05-25 | 2023-06-27 | 苏州清研精准汽车科技有限公司 | Power battery, data measurement method thereof and vehicle |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101131417A (en) * | 2006-08-22 | 2008-02-27 | 德尔菲技术公司 | Battery monitoring system |
| CN101275990A (en) * | 2007-03-27 | 2008-10-01 | 孙斌 | Device and method for measuring accumulator internal resistance |
| CN102866362A (en) * | 2012-09-27 | 2013-01-09 | 重庆大学 | Electric vehicle power battery impedance characteristic measuring method |
| CN203299350U (en) * | 2013-05-08 | 2013-11-20 | 山西大学 | Battery internal resistance on-line measuring instrument |
| CN205353210U (en) * | 2015-12-17 | 2016-06-29 | 西安交通大学 | It is applicable in internal resistance of cell on -line monitoring device of multiple battery type |
| CN105738826A (en) * | 2016-03-07 | 2016-07-06 | 深圳市东宸智造科技有限公司 | Storage battery detection system and method |
| CN205880058U (en) * | 2016-07-18 | 2017-01-11 | 天津金星奥宇科技有限公司 | Power battery inter block hinders measurement system |
-
2016
- 2016-07-18 CN CN201610571445.4A patent/CN105954592B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101131417A (en) * | 2006-08-22 | 2008-02-27 | 德尔菲技术公司 | Battery monitoring system |
| CN101275990A (en) * | 2007-03-27 | 2008-10-01 | 孙斌 | Device and method for measuring accumulator internal resistance |
| CN102866362A (en) * | 2012-09-27 | 2013-01-09 | 重庆大学 | Electric vehicle power battery impedance characteristic measuring method |
| CN203299350U (en) * | 2013-05-08 | 2013-11-20 | 山西大学 | Battery internal resistance on-line measuring instrument |
| CN205353210U (en) * | 2015-12-17 | 2016-06-29 | 西安交通大学 | It is applicable in internal resistance of cell on -line monitoring device of multiple battery type |
| CN105738826A (en) * | 2016-03-07 | 2016-07-06 | 深圳市东宸智造科技有限公司 | Storage battery detection system and method |
| CN205880058U (en) * | 2016-07-18 | 2017-01-11 | 天津金星奥宇科技有限公司 | Power battery inter block hinders measurement system |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111213063A (en) * | 2017-10-16 | 2020-05-29 | 尼亚布科知识产权控股有限责任公司 | Battery monomer monitoring system |
| CN108152753A (en) * | 2017-12-30 | 2018-06-12 | 天津华庆百胜能源有限公司 | A kind of method that accumulator internal resistance is detected by inductance capacitance discharged in series |
| US20210172905A1 (en) * | 2018-01-04 | 2021-06-10 | Lyten, Inc. | Sensing device for detecting analytes in batteries |
| US12119462B2 (en) * | 2018-01-04 | 2024-10-15 | Lyten, Inc. | Sensing device for detecting analytes in batteries |
| WO2020106043A1 (en) * | 2018-11-23 | 2020-05-28 | 주식회사 엘지화학 | Battery monitoring system |
| US10948547B2 (en) | 2018-11-23 | 2021-03-16 | Lg Chem, Ltd. | Battery monitoring system |
| CN109444598A (en) * | 2018-11-30 | 2019-03-08 | 广东电网有限责任公司 | A kind of performance test methods of supercapacitor |
| CN113906301A (en) * | 2020-04-28 | 2022-01-07 | 旻泰克科技股份有限公司 | Battery current dynamic inspection system and method |
| CN114061793A (en) * | 2021-12-17 | 2022-02-18 | 中国电信股份有限公司 | Calibration device and calibration method for temperature sensor |
| CN116331060A (en) * | 2023-05-25 | 2023-06-27 | 苏州清研精准汽车科技有限公司 | Power battery, data measurement method thereof and vehicle |
| CN116331060B (en) * | 2023-05-25 | 2023-09-05 | 苏州清研精准汽车科技有限公司 | Power battery, data measurement method thereof and vehicle |
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