CN110716147A - Method and device for measuring internal resistance of battery pack - Google Patents
Method and device for measuring internal resistance of battery pack Download PDFInfo
- Publication number
- CN110716147A CN110716147A CN201911112011.8A CN201911112011A CN110716147A CN 110716147 A CN110716147 A CN 110716147A CN 201911112011 A CN201911112011 A CN 201911112011A CN 110716147 A CN110716147 A CN 110716147A
- Authority
- CN
- China
- Prior art keywords
- measuring
- measurement
- units
- unit
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
-
- 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
Abstract
The application discloses method and device for measuring internal resistance of battery pack, relating to the technical field of power electronics, wherein the device for measuring internal resistance of battery pack comprises: the battery pack comprises N groups of measuring units, wherein each measuring unit is used for measuring the internal resistance of one battery unit, N is more than or equal to 2, each group of measuring units comprises at least one measuring unit, at least one group of the N groups of measuring units comprises more than two measuring units, and the number of the measuring units in any two groups of measuring units is equal or has one difference; the control unit is in communication connection with the N groups of measuring units and is used for controlling the N groups of measuring units to start measurement successively; and after one group of measuring units finishes measuring, the next group of measuring units starts measuring until the N groups of measuring units finish measuring. The embodiment of the application is applied to measuring the internal resistance of the battery pack.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a method and a device for measuring internal resistance of a battery pack.
Background
The internal resistance of the battery is a very important parameter for judging the performance of the battery, and the internal resistance of each battery in the battery pack needs to be regularly measured in the operation, maintenance and management processes of the battery pack so as to evaluate the capacity and performance of the current battery and predict the service life of the battery according to the variation trend of the internal resistance value.
In the prior art, two methods are mainly used for measuring the internal resistance of the battery pack, wherein the first method is a simultaneous measurement method, and the second method is a single-section measurement method. The first method has large measurement error, and the second method has small measurement error but takes too long measurement time.
Disclosure of Invention
The embodiment of the application provides a method and a device for measuring internal resistance of a battery pack, which are used for solving the problems of large error and long consumed time of the existing method for measuring internal resistance of the battery pack.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, an embodiment of the present application provides a device for measuring internal resistance of a battery pack, the device including:
the battery pack comprises N groups of measuring units, wherein each measuring unit is used for measuring the internal resistance of one battery unit, N is more than or equal to 2, each group of measuring units comprises at least one measuring unit, at least one group of the N groups of measuring units comprises more than two measuring units, and the number of the measuring units in any two groups of measuring units is equal or has one difference;
the control unit is in communication connection with the N groups of measuring units and is used for controlling the N groups of measuring units to start measurement successively; and after one group of measuring units finishes measuring, the next group of measuring units starts measuring until the N groups of measuring units finish measuring.
In a second aspect, embodiments of the present application provide a measurement unit, including:
the first receiving module is used for receiving the internal resistance measuring command sent by the control unit;
the second receiving module is used for receiving a measurement completion signal sent by the measuring unit connected in series with the measuring unit;
the sending module is used for sending a measurement completion signal to the measuring unit connected with the measuring unit in series;
the processing module is used for starting measurement when the measurement unit is determined to belong to the first group of measurement units, and sending a measurement completion signal to the measurement unit connected in series with the measurement unit through the sending module after the measurement is completed; and if the measurement unit is determined not to belong to the first group of measurement units, starting measurement after the second receiving module receives the measurement completion signal.
In a third aspect, an embodiment of the present application provides a method for measuring internal resistance of a battery pack, including:
the battery pack comprises N groups of battery units, wherein N is more than or equal to 2, at least one group of the N groups of battery units comprises more than two battery units, and the number of the battery units in any two groups of battery units is equal or has one difference; the measuring method comprises the following steps:
the measuring device measures the internal resistance of the N groups of battery units one by one, wherein the measuring device simultaneously starts to measure the battery units in the same group, and after one group of battery units finishes measuring, the measuring device starts to measure the next group of battery units until the measuring device finishes measuring the N groups of battery units.
In a fourth aspect, an embodiment of the present application provides a method for measuring internal resistance of a battery pack, including:
the measuring unit receives an internal resistance measuring command sent by the control unit;
if the measuring unit belongs to the first group of measuring units, starting to measure, and after the measurement is finished, sending a measurement finished signal to the measuring unit connected with the measuring unit in series;
and if the measurement unit does not belong to the first group of measurement units, starting measurement after receiving the measurement completion signal.
In a fifth aspect, there is provided a measuring apparatus comprising: a processor and a memory, wherein the memory is used for storing programs, and the processor calls the programs stored in the memory to enable the measuring device to execute the measuring method of the internal resistance of the battery pack in the third aspect.
In a sixth aspect, there is provided a measurement unit comprising: the processor calls the program stored in the memory so as to enable the measuring unit to execute the measuring method of the internal resistance of the battery pack in the fourth aspect. The processor and the memory may be provided separately or integrated together, and for example, the processor and the memory may be integrated into a Microcontroller (MCU).
In a seventh aspect, there is provided a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a measurement apparatus, cause the measurement apparatus to perform the method of measuring the internal resistance of a battery pack according to the third aspect.
In an eighth aspect, there is provided a computer readable storage medium storing one or more programs, the one or more programs comprising instructions, which when executed by a measurement unit, cause the measurement unit to perform the method of measuring the internal resistance of a battery pack as set forth in the fourth aspect.
In a ninth aspect, there is provided a computer program product containing instructions which, when run on a measurement device, cause the measurement device to perform the method of measuring the internal resistance of a battery pack according to the third aspect.
In a tenth aspect, a computer program product is provided comprising instructions which, when run on a measurement unit, cause the measurement unit to perform the method of measuring the internal resistance of a battery as described in the fourth aspect.
The embodiment of the application provides a method and a device for measuring internal resistance of a battery pack. According to the method and the device, the battery pack is divided into N groups of battery units, the internal resistances of the N groups of battery units are measured successively, so that the problem that the measurement speed of the existing battery pack internal resistance measurement method is too slow is solved, each group of battery units is connected with other groups of battery units in series, and the battery units in the same group cannot influence each other when the battery units in the same group are measured simultaneously, so that the problem that the measurement error of the existing battery pack internal resistance measurement method is large is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a battery pack according to an embodiment of the present invention;
fig. 2 is a measurement system of internal resistance of a battery provided in the related art;
fig. 3 is a system for measuring internal resistance of a battery according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a connection between a measurement unit and a control unit according to an embodiment of the present invention 1;
FIG. 5 is a schematic diagram of a connection between a measurement unit and a control unit provided in an embodiment of the present invention, FIG. 2;
fig. 6 is a schematic structural diagram 1 of a measurement unit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram 2 of a measurement unit according to an embodiment of the present invention.
Detailed Description
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the schematic diagram of the battery pack of fig. 1, the battery pack 200 includes M (M ≧ 3) battery units, where each battery unit may be a battery or may be a plurality (i.e., at least two) of battery cells connected in series-parallel, and when measuring the internal resistance of a battery unit formed by a plurality of battery cells connected in series-parallel, it refers to the overall internal resistance of the battery unit. Typically the battery is a secondary battery.
To perform the internal resistance measurement of the battery pack of fig. 1, the measurement system shown in fig. 2 may be referred to in the related art.
In the first method, the battery internal resistance simultaneous measurement method:
as shown in fig. 2, each battery of the battery pack is connected to a measuring instrument, the positive and negative ends of the measuring instrument are respectively connected to the positive and negative ends of a single battery, an alternating current signal (a fixed current and an alternating current signal with a fixed frequency, for example, the fixed frequency may be 1.0KHZ, or 1.0KHZ ± 0.1Hz) is injected into a loop of a connected line through internal hardware circuits and program control of the measuring instrument, a voltage drop signal generated at the two ends of the battery by measuring the alternating current signal and the injected current signal, and then a ratio of voltage to current is calculated as internal resistance. Wherein M internal resistance measuring instruments correspondingly connected with the M batteries work simultaneously, and the internal resistance measuring time of the whole battery set is short.
The first method has problems in that: when all single batteries of the battery pack are measured simultaneously, the n measuring instruments generate high-frequency alternating current injection signals with the same frequency at the same time, the reference zero points of the adjacent battery measuring instruments can be influenced mutually, large errors occur in value errors measured by the internal resistance of the battery pack, and the errors are large when the measurement is repeated. The analysis and maintenance can not be carried out according to the test data during the operation and the background management of the battery pack, so that the measurement of the internal resistance of the battery pack has no practical reference significance.
The second method, the single-section measurement method of the internal resistance of the battery pack:
as shown in fig. 2, M measuring instruments are respectively connected to the positive and negative ends of a single battery in a corresponding battery pack according to the positive and negative ends, the measuring instrument 1 injects an ac signal into a connected loop by controlling the measuring instrument unit, and calculates the ratio of voltage to current as the internal resistance of the battery by measuring a voltage drop signal and an injected current signal generated by the ac signal at the two ends of the corresponding battery. And after the measurement of the measuring instrument 1 is finished, starting the measuring instrument 2 again for measurement, and so on until the measurement of the measuring instrument n is finished. And when the measurement of the measuring instrument M is finished, the measurement of the internal resistance of the whole group of battery packs is finished.
In order to solve the problems of the existing method for measuring the internal resistance of the battery pack, the system for measuring the internal resistance of the battery pack provided by the application is shown in fig. 3 and comprises a measuring device 100, a battery pack 200 and a load device 300. Wherein, the measuring device 100 comprises M (M ≧ 3) measuring units 101 and a control unit 102. The measuring unit 101 is a slave, and may be a measuring instrument, which may measure data such as temperature and voltage of the battery unit in addition to measuring the internal resistance of the battery unit, and the control unit 102 is a master, and may be a PC, a single chip microcomputer, or the like.
Examples 1,
The embodiment of the present application provides a measurement apparatus for internal resistance of a battery pack, as shown in fig. 4, the measurement apparatus 100 includes: the M measurement units 101 and the control unit 102 are specifically:
the measurement unit 101 is used to measure the internal resistance of one battery cell. The M measuring units form N groups of measuring units, N is larger than or equal to 2, each group of measuring units comprises at least one measuring unit, at least one group of the N groups of measuring units comprises more than two measuring units, and the number of the measuring units in any two groups of measuring units is equal or the difference is one.
For example, if M is 80 and N is 2, there are 40 measurement units in the first set of measurement units, and there are 40 measurement units in the second set of measurement units, and the number of the first set of measurement units and the second set of measurement units is equal. Thus, the measurement device 100 can measure a battery pack formed by connecting 80 battery cells in series, wherein the 80 battery cells are divided into two groups, and if the battery cells connected with the measurement unit of the same group are distributed at intervals, for example, it is assumed that the battery cells are numbered as shown in fig. 1, the odd-numbered battery cells are connected with one group of the measurement units, and the even-numbered battery cells are connected with the other group of the measurement units, so that the measurement units in the same group do not affect each other when measuring internal resistance when the measurement units in the same group measure simultaneously.
The control unit 102 is in communication connection with the measurement unit 101, and is used for controlling the N groups of measurement units to start measurement successively; and after one group of measuring units finishes measuring, the next group of measuring units starts measuring until the N groups of measuring units finish measuring.
For example, N is 2, the control unit may control the first group of measurement units to start measurement at the same time, and after the first group of measurement units finish measurement, the control unit may feed back the measurement result to the control unit, and then the control unit controls the second group of measurement units to start measurement. Of course, after the first group of measurement units completes the measurement, the first group of measurement units notifies the second group of measurement units to start the measurement.
For example, N is 3, the control unit may control the first group of measurement units to start measurement simultaneously, and after the first group of measurement units finish measurement, the control unit or the first group of measurement units notifies the second group of measurement units to start measurement, and after the second group of measurement units finish measurement, the control unit or the second group of measurement units notifies the third group of measurement units to start measurement, thereby shortening the time required for measurement.
Optionally, referring to fig. 4, the measurement units are connected in series, where measurement units of other groups are connected in series between any two adjacent measurement units in the same group, and the number of measurement units connected in series between any two adjacent measurement units in the same group is the same. Specifically, each measuring unit is in communication connection with the control unit through a communication bus, the communication bus may be an RS-485 bus, and the measuring units are connected in series through IO ports.
Illustratively, when N is 2, M is 80, and the numbers of the measurement units are from 1 to 80, the measurement units in the first group are measurement unit 1, measurement unit 3, measurement unit 5, and measurement unit … …, and the measurement units in the first group are measurement units 79, and are respectively connected with battery units 1, 3, 5, and … …; the second group of measuring units are measuring unit 2, measuring unit 4, measuring unit 6 … … and measuring unit 80, and are respectively connected with battery unit 2, battery unit 4 and battery unit 6 … … and battery unit 80. Because the measuring units of the first group are directly connected with the measuring units of the second group, the measuring units of the first group can inform the measuring units of the second group of measuring units to start measuring after the measuring units of the first group measure the internal resistance of each odd-numbered battery unit.
Specifically, the measurement unit 101 and the control unit 102 are specifically configured to:
the control unit is used for broadcasting the internal resistance measurement command. For example, as shown in fig. 4, the control unit issues the internal resistance measurement command in a manner of broadcasting the command according to an RS-485 communication manner, and specifically broadcasts the internal resistance measurement command through a 485 bus (including an a line and a B line). In addition, before the control unit broadcasts the internal resistance measurement command, an initialization command can be issued in an RS-485 communication mode in a broadcast command mode, so as to pull up the first IO port and the second IO port of each measurement unit.
Each measuring unit is used for starting measurement if determining that the measuring unit belongs to the first group of measuring units after receiving the internal resistance measuring command, and sending a measuring completion signal to a second group of measuring units connected in series with the measuring unit after the measurement is completed; and if the mobile terminal does not belong to the first group of measuring units, starting to measure after receiving a measurement completion signal sent by the last group of measuring units connected in series with the mobile terminal.
For example, as shown in fig. 4, when N is 2, the level of the second IO port is pulled down after the measurement is completed by the first group of measurement units (e.g., measurement unit 1, measurement unit 3, and measurement unit … …), and since the second IO port of the first group of measurement units is connected to the first IO port of the second group of measurement units (measurement unit 2, measurement unit 4, and measurement unit … …), the level of the first IO port of the second group of measurement units is pulled down (i.e., a measurement completion signal), so as to start the measurement.
For example, as shown in fig. 4, when N is 3, after the measurement is completed by the first group of measurement units (e.g., measurement unit 1, measurement unit 4, and measurement unit 79 of … …), the level of the second IO port of the first group of measurement units is pulled low, so that the level of the first IO port of the second group of measurement units (measurement unit 2, measurement unit 5, and measurement unit … …) is also pulled low, so as to start the measurement, after the measurement is completed by the second group of measurement units, the level of the second IO port of the second group of measurement units is pulled low, and the first IO port of the third group of measurement units (measurement unit 3, measurement unit 5, and measurement unit … …) is pulled low, so as to start the measurement. The first IO port of the measurement unit 1 is connected to the IO port of the control unit.
Alternatively, the control unit 102 assigns addresses to the respective measurement units 101. The address of the measurement unit 101 is used to indicate that the position of the measurement unit 101 is odd or even according to the order in which the measurement units 101 are connected in series. For example, when N is 2, the address of the 1 st concatenated measurement unit is 1, the address of the 2 nd concatenated measurement unit is 2, the address of the 3 rd concatenated measurement unit is 3, the address of the 4 th concatenated measurement unit is 4, and so on, the address of the mth concatenated measurement unit is M.
Referring to fig. 4, before allocating an address, each IO port of each measurement unit 101 is at a high level, the control unit 102 pulls down the level of the first IO port of the measurement unit 1, and the first IO ports of the other measurement units are at high levels, at this time, the control unit 102 sends the address of the measurement unit 1 through the RS-485 bus, and at this time, since the level of the first IO port of the measurement unit 1 is at a low level and the first IO ports of the other measurement units are at high levels, the measurement unit 1 configures the address of itself as the address allocated to it by the control unit 102, and the other measurement units do not configure; then, the measurement unit 1 may feed back a configuration completion signal to the control unit 102, and pull down the level of the first IO port of the measurement unit 2, and the control unit 102 sends the address of the measurement unit 2 through the RS-485 bus, at this time, since the address of the measurement unit 1 is already configured, the measurement unit 2 does not configure the address of its own as the address allocated by the control unit 102, and the measurement unit after the measurement unit 3 does not configure because its first IO port is at a high level; and the like until the address configuration of all the measurement units is completed.
Alternatively, each time the control unit 102 is started (powered up), an address is reassigned to each measurement unit 101 to which the control unit is connected.
In one case, each measuring unit 101 is configured to, after receiving the internal resistance measurement command, start measurement if it is determined that its own position is an odd number according to its own address, and after the measurement is completed, send a measurement completion signal to the measuring unit whose position is an even number; and if the position of the mobile terminal is determined to be an even number according to the address of the mobile terminal, starting measurement after receiving a measurement completion signal.
For example, when N is 2, if the measurement unit 1, 3, … … 79 determines that its own address is an odd number (i.e., its own position is also an odd number) after receiving the internal resistance measurement command, starts measurement, and after the measurement is completed, sends a measurement completion signal to the measurement unit 2, 4, … … 80 whose connected position is an even number, and after the measurement unit 2, 4, … … 80 receives the internal resistance measurement command, determines that its own address is an even number, waits until the measurement completion signal sent by the measurement unit 1, 3, … … 79 is received (the measurement unit 1, 3, … … 79 pulls down the first IO port level of the measurement unit 2, 4, … … 80). In another case, each measuring unit is configured to, after receiving the internal resistance measuring command, start measurement if it is determined that its position is an even number according to its address, and after the measurement is completed, send a measurement completion signal to the measuring unit whose position is an odd number; and if the position of the mobile terminal is determined to be an odd number according to the address of the mobile terminal, starting measurement after receiving a measurement completion signal.
In this manner, even positions are used as the first group, odd positions are used as the second group, the implementation process is similar to the above, according to the example of 80 measurement units, after the measurement of the measurement unit 2, 4, … … 80 is completed, the second IO port level of the measurement unit 1, 3, … … 79 may be pulled low, so that the measurement unit 1, 3, … … 79 starts to measure.
In the embodiments given above, when the measuring unit with address 1 and the measuring unit with address 3 operate simultaneously, the measuring unit 1 with address 1 performs low-current constant-current source dc pulse discharge on the connected battery unit, and the high-frequency small signal generated at the two ends A, B of the battery unit does not affect the reference zero point D of the measuring unit with address 3; similarly, the measuring unit with the address of 3 carries out low-current constant-current source direct-current pulse discharge on the connected battery unit, and the high-frequency small signal generated at the two ends of C, D does not influence the reference zero point B of the measuring unit with the address of 1. Therefore, the internal resistances of the batteries measured by the measuring units 1 and 3 can truly reflect the internal resistances of the batteries connected with the measuring units. Similarly, all the measurement units with odd addresses will not affect each other.
Alternatively, referring to fig. 5, the measurement units may not be connected in series. Taking N as an example, M measurement units are divided into two groups, where measurement units 1 to [ M/2] are a first group and can be respectively connected with odd-numbered battery cells, measurement units [ M/2] +1 to M are a second group and can be respectively connected with even-numbered battery cells, and both measurement units are directly controlled by the control unit, that is, after the measurement unit in the first group finishes measuring the internal resistance of the odd-numbered battery cells, the control unit is notified, and the control unit sends a command to the measurement unit in the second group to start the measurement operation. Wherein [ M/2] can be rounded up or rounded down. Because the position intervals of the battery units connected with the same group of measuring units, the internal resistance of each battery unit can be accurately measured. Of course, the measuring units may be divided into two groups in other ways, and the serial numbers of the measuring units in the same group may be discontinuous, as long as the numbers of the two groups of measuring units are equal or differ by 1.
In this embodiment, a method for measuring internal resistance of a battery pack is further provided, where the battery pack refers to fig. 1, and includes N groups of M battery cells, where N is greater than or equal to 2, at least one of the N groups of battery cells includes more than two battery cells, and the number of battery cells in any two groups of battery cells is equal to or differs by one; each of the battery units is connected in series, wherein battery units of other groups are connected in series between any two adjacent battery units in the same group, for example, M battery units are connected with M measurement units in the measurement device, and each battery unit is connected with one measurement unit.
The measuring method comprises the following steps:
the measuring device measures the internal resistance of the N groups of battery units one by one, wherein the measuring device simultaneously starts to measure the battery units in the same group, and after one group of battery units finishes measuring, the measuring device starts to measure the next group of battery units until the measuring device finishes measuring the N groups of battery units. For a specific implementation method, reference may be made to the above description, which is not repeated herein.
Optionally, the battery units are connected in series, wherein battery units of other groups are connected in series between any two adjacent battery units in the same group.
For example, when M battery cells form 2 groups of battery cells, the measurement unit 101 starts measurement on the battery cells in the first group at the same time, and after the measurement on the battery cells in the first group is completed, the measurement device 100 starts measurement on the battery cells in the second group.
In one implementation:
after the control unit 102 is powered on, address allocation is performed on all the measurement units 101 hooked on the bus, the address of the first measurement unit 101 connected with the control unit 102 is 1, and so on until the address of the mth measurement unit 101 is configured as M. When the control unit 102 issues an internal resistance measurement command through the communication bus, after all the measurement units 101 receive the command through the communication bus, the internal address of the measurement unit 101 is inquired and judged, and when the internal address of the measurement unit 101 is an odd number, the internal hardware circuit of the measurement unit 101 works to start to measure the connected battery units. And the measurement units with the even addresses wait for the measurement units with the odd addresses to complete the test. When the measurement unit with the odd address measures the internal resistance of the correspondingly connected battery, the measurement unit with the even address is informed in a hardware communication mode, and after the measurement unit with the even address receives a signal transmitted by the measurement unit with the odd address, an internal hardware circuit starts to work until the internal resistance measurement work of the connected battery is completed.
Optionally, after the internal resistances of all the batteries of the battery pack are measured, the control unit 102 sends the measurement data of the battery pack to the upper computer to provide data for analysis and processing.
Example 2.
The embodiment of the present application provides a measurement unit, configured to execute the following method for measuring internal resistance of a battery pack, as shown in fig. 6, where the measurement unit 101 includes a first receiving module, a second receiving module, a sending module, and a processing module, and specifically includes:
and the first receiving module is used for receiving the internal resistance measuring command sent by the control unit.
And the second receiving module is used for receiving the measurement completion signal sent by the measuring unit connected in series with the measuring unit.
And the sending module is used for sending a measurement completion signal to the measurement unit connected in series with the measurement unit.
The processing module is used for starting measurement when the measurement unit is determined to belong to the first group of measurement units, and sending a measurement completion signal to the measurement unit connected in series with the measurement unit through the sending module after the measurement is completed; and if the measurement unit is determined not to belong to the first group of measurement units, starting measurement after the second receiving module receives the measurement completion signal. Optionally, the first receiving module is further configured to receive an address allocated to the measurement unit and sent by the control unit.
Optionally, the processing module is further configured to determine whether the measurement unit belongs to the first group of measurement units according to the address. As shown in fig. 7, the internal hardware circuit of the measurement unit includes a load resistor, a high-pass filter amplifier circuit, a low-pass filter amplifier circuit, a band-pass filter amplifier circuit, a small-signal precision rectifier circuit, an averaging circuit, a constant current source discharge circuit, and an MCU.
When the measuring unit is used for measuring, the MCU controls the constant current source discharging circuit to discharge by using low current constant current source direct current pulses, response voltages generated at two ends of the battery are amplified by filtering for three times, then pass through the small signal precise rectifying circuit and the averaging circuit, are converted into stable direct current signals which can be directly measured, and are output to an ADC (analog-to-digital converter) port of the MCU, and optionally, the MCU calculates the internal resistance of the battery unit according to the current and the response voltage of the discharging circuit.
As shown in fig. 6 and 7, the MCU microcontroller in fig. 7 executes the method for measuring the internal resistance of the battery pack to implement the function of the processing module in fig. 6, the first receiving module in fig. 6 receives the command of the control unit through the 485 interface (including the a terminal and the B terminal) in fig. 7, the second receiving module in fig. 6 receives the measurement completion signal sent by the measurement unit connected in series with the measurement unit through the IO port in fig. 7, and the sending module in fig. 6 sends the measurement completion signal to the measurement unit connected in series with the measurement unit through the IO port in fig. 7.
Specifically, the method for measuring the internal resistance of the battery pack, which is performed by the measurement unit 101, includes:
the measuring unit receives the internal resistance measuring command sent by the control unit.
And if the measuring unit belongs to the first group of measuring units, starting to measure, and after the measurement is finished, sending a measurement finishing signal to the measuring unit connected with the measuring unit in series.
And if the measurement unit does not belong to the first group of measurement units, starting measurement after receiving the measurement completion signal.
Optionally, the address allocated to the measurement unit sent by the control unit is received.
Optionally, it is determined whether the measurement unit belongs to the first group of measurement units according to the address.
For example, when there are only two sets of measuring units, the measuring units may perform the internal resistance measuring operation in the following manner.
In one case, if the address of the measurement unit is odd, the measurement unit belongs to the first group of measurement units, the measurement is started, and after the measurement is completed, a measurement completion signal is sent to the even measurement unit connected in series with the measurement unit. In this case, if the address of the measurement unit is an even number, the measurement is started after receiving the measurement completion signal transmitted from the measurement unit of the first group.
In another case, if the address of the measurement unit is even, the measurement unit belongs to the first group of measurement units, the measurement is started, and after the measurement is completed, a measurement completion signal is sent to the odd measurement units connected in series with the measurement unit. In this case, the address of the measurement unit is odd, and the measurement is started after receiving the measurement completion signal transmitted from the measurement unit of the first group.
Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, a module or a unit may be divided into only one logic function, and another division may be implemented in practice. For example, various elements or components may be combined or may be integrated into another device, or some features may be omitted, or not implemented. 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. Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. 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 invention 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 readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributed to by the prior art, or all or part of the technical solutions may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk.
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 changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A device for measuring the internal resistance of a battery, comprising:
the battery pack comprises N groups of measuring units, wherein each measuring unit is used for measuring the internal resistance of one battery unit, N is more than or equal to 2, each group of measuring units comprises at least one measuring unit, at least one group of the N groups of measuring units comprises more than two measuring units, and the number of the measuring units in any two groups of measuring units is equal or has one difference;
the control unit is in communication connection with the N groups of measuring units and is used for controlling the N groups of measuring units to start measurement successively; and after one group of measuring units finishes measuring, the next group of measuring units starts measuring until the N groups of measuring units finish measuring.
2. The apparatus of claim 1, wherein each of the measuring units is connected in series, and wherein any two adjacent measuring units in the same group are connected in series with other groups of measuring units.
3. The apparatus of claim 2, wherein the number of measurement units connected in series between any two adjacent measurement units in the same group is the same.
4. The apparatus of claim 3, comprising:
the control unit is used for broadcasting an internal resistance measurement command;
each measuring unit is used for starting measurement if determining that the measuring unit belongs to the first group of measuring units after receiving the internal resistance measuring command, and sending a measuring completion signal to a second group of measuring units connected in series with the measuring unit after the measurement is completed; and if the mobile terminal does not belong to the first group of measuring units, starting to measure after receiving the measurement completion signal sent by the last group of measuring units connected in series with the mobile terminal.
5. The apparatus of claim 4, wherein N is 2;
the control unit is further used for allocating addresses to the measurement units, the addresses of the measurement units are used for indicating the order of the serial connection of the measurement units, and the positions of the measurement units are odd numbers or even numbers;
each measuring unit is used for starting measurement if the position of the measuring unit is determined to be an odd number according to the address of the measuring unit after receiving the internal resistance measuring command, and sending the measuring unit with the even number after the measurement is finished; if the position of the mobile terminal is determined to be an even number according to the address of the mobile terminal, starting measurement after receiving the measurement completion signal; or after each measuring unit is used for receiving the internal resistance measuring command, if the position of the measuring unit is determined to be an even number according to the address of the measuring unit, the measuring unit starts to measure, and after the measurement is finished, the measuring unit sends the internal resistance measuring command to the measuring unit with the odd number; and if the position of the mobile terminal is determined to be an odd number according to the address of the mobile terminal, starting measurement after receiving the measurement completion signal.
6. A measurement unit, comprising:
the first receiving module is used for receiving the internal resistance measuring command sent by the control unit;
the second receiving module is used for receiving a measurement completion signal sent by the measuring unit connected in series with the measuring unit;
the sending module is used for sending a measurement completion signal to the measuring unit connected in series with the measuring unit;
the processing module is used for starting measurement when the measurement unit is determined to belong to the first group of measurement units, and sending a measurement completion signal to the measurement units connected in series with the measurement units through the sending module after the measurement is completed; and if the measurement unit is determined not to belong to the first group of measurement units, starting measurement after the second receiving module receives the measurement completion signal.
7. The measurement unit of claim 6, comprising:
the first receiving module is further configured to receive an address allocated to the measurement unit and sent by the control unit;
the processing module is further configured to determine whether the measurement unit belongs to a first group of measurement units according to the address.
8. The method for measuring the internal resistance of the battery pack is characterized in that the battery pack comprises N groups of battery units, wherein N is more than or equal to 2, at least one group of the N groups of battery units comprises more than two battery units, and the number of the battery units in any two groups of battery units is equal or has one difference; the battery units are mutually connected in series, wherein battery units of other groups are connected between any two adjacent battery units in the same group in series; the measuring method comprises the following steps:
the measuring device measures the internal resistance of the N groups of battery units one by one, wherein the measuring device simultaneously starts to measure the battery units in the same group, and after one group of battery units finishes measuring, the measuring device starts to measure the next group of battery units until the measuring device finishes measuring the N groups of battery units.
9. A method of measuring internal resistance of a battery, comprising:
the measuring unit receives an internal resistance measuring command sent by the control unit;
if the measuring unit belongs to the first group of measuring units, starting to measure, and after the measurement is finished, sending a measurement finished signal to the measuring unit connected with the measuring unit in series;
and if the measurement unit does not belong to the first group of measurement units, starting measurement after receiving a measurement completion signal.
10. The measurement method according to claim 9, characterized in that the measurement method further comprises:
receiving an address distributed for the measurement unit and sent by the control unit;
and determining whether the measurement unit belongs to a first group of measurement units according to the address.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911112011.8A CN110716147A (en) | 2019-11-14 | 2019-11-14 | Method and device for measuring internal resistance of battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911112011.8A CN110716147A (en) | 2019-11-14 | 2019-11-14 | Method and device for measuring internal resistance of battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110716147A true CN110716147A (en) | 2020-01-21 |
Family
ID=69215958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911112011.8A Pending CN110716147A (en) | 2019-11-14 | 2019-11-14 | Method and device for measuring internal resistance of battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110716147A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983490A (en) * | 2020-08-20 | 2020-11-24 | 云蜂数智物联网有限公司 | Nuclear capacity test system, method and device |
| CN113406516A (en) * | 2021-07-16 | 2021-09-17 | 山东泰开自动化有限公司 | Storage battery internal resistance on-line monitoring device based on low-current pulse discharge method |
| CN113489086A (en) * | 2021-06-11 | 2021-10-08 | 王灏 | Refined state control system and method for matrix battery module |
Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6094053A (en) * | 1995-11-06 | 2000-07-25 | Ford Global Technologies, Inc. | Method and apparatus for identifying electronic circuits in a distributed electronic system |
| CN2775673Y (en) * | 2005-01-28 | 2006-04-26 | 哈尔滨维泰斯能源技术有限公司 | On-line diagnostic and intelligent activating device for accumulator |
| CN2836029Y (en) * | 2005-11-28 | 2006-11-08 | 孙斌 | Online monitoring system for internal resistance and deterioration state of storage battery |
| CN101029920A (en) * | 2006-09-07 | 2007-09-05 | 长安大学 | System for inspecting operation parameter of central/distributed electric vehicle battery set |
| CN101183142A (en) * | 2007-05-15 | 2008-05-21 | 李庆兰 | On-line measurement method of accumulator cell essential resistance, electrical current work module and accumulator cell essential resistance on-line measurement instrument |
| CN101275990A (en) * | 2007-03-27 | 2008-10-01 | 孙斌 | Device and method for measuring accumulator internal resistance |
| CN101799519A (en) * | 2010-01-20 | 2010-08-11 | 上海佰讯通智能科技有限公司 | Online measuring system of storage batteries and measuring method thereof |
| CN202256636U (en) * | 2011-09-16 | 2012-05-30 | 深圳桑达国际电子器件有限公司 | Battery voltage detecting circuit and battery managing system |
| CN103163378A (en) * | 2011-12-08 | 2013-06-19 | 哈尔滨智木科技有限公司 | Battery polarization internal resistance measuring method |
| CN104833924A (en) * | 2015-04-29 | 2015-08-12 | 深圳市共济科技有限公司 | Serial automatic addressing method and system of lead storage battery internal resistance detection modules |
| CN105474660A (en) * | 2014-02-13 | 2016-04-06 | 罗伯特·博世有限公司 | Battery management system for battery having a plurality of battery cells, and method therefor |
| CN106019160A (en) * | 2016-05-13 | 2016-10-12 | 福建省汽车工业集团云度新能源汽车股份有限公司 | Electric vehicle battery management system with AC internal resistance inspection function and detection method |
| CN107239047A (en) * | 2016-03-29 | 2017-10-10 | 华为技术有限公司 | Battery management system and the method for numbering serial to battery detection unit |
| CN107561450A (en) * | 2017-08-07 | 2018-01-09 | 漳州科华技术有限责任公司 | A kind of monomer battery voltage measurement apparatus and method |
| CN108169693A (en) * | 2018-03-21 | 2018-06-15 | 国家电网公司 | A kind of accumulator group online evaluation detecting system |
| CN108196192A (en) * | 2017-12-21 | 2018-06-22 | 广东电网有限责任公司东莞供电局 | Storage battery internal resistance On-line Measuring Method |
| CN108761350A (en) * | 2018-08-24 | 2018-11-06 | 中国科学技术大学 | A kind of fuel cell pack monomer voltage polling system with start and stop Balance route |
-
2019
- 2019-11-14 CN CN201911112011.8A patent/CN110716147A/en active Pending
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6094053A (en) * | 1995-11-06 | 2000-07-25 | Ford Global Technologies, Inc. | Method and apparatus for identifying electronic circuits in a distributed electronic system |
| CN2775673Y (en) * | 2005-01-28 | 2006-04-26 | 哈尔滨维泰斯能源技术有限公司 | On-line diagnostic and intelligent activating device for accumulator |
| CN2836029Y (en) * | 2005-11-28 | 2006-11-08 | 孙斌 | Online monitoring system for internal resistance and deterioration state of storage battery |
| CN101029920A (en) * | 2006-09-07 | 2007-09-05 | 长安大学 | System for inspecting operation parameter of central/distributed electric vehicle battery set |
| CN101275990A (en) * | 2007-03-27 | 2008-10-01 | 孙斌 | Device and method for measuring accumulator internal resistance |
| CN101183142A (en) * | 2007-05-15 | 2008-05-21 | 李庆兰 | On-line measurement method of accumulator cell essential resistance, electrical current work module and accumulator cell essential resistance on-line measurement instrument |
| CN101799519A (en) * | 2010-01-20 | 2010-08-11 | 上海佰讯通智能科技有限公司 | Online measuring system of storage batteries and measuring method thereof |
| CN202256636U (en) * | 2011-09-16 | 2012-05-30 | 深圳桑达国际电子器件有限公司 | Battery voltage detecting circuit and battery managing system |
| CN103163378A (en) * | 2011-12-08 | 2013-06-19 | 哈尔滨智木科技有限公司 | Battery polarization internal resistance measuring method |
| CN105474660A (en) * | 2014-02-13 | 2016-04-06 | 罗伯特·博世有限公司 | Battery management system for battery having a plurality of battery cells, and method therefor |
| CN104833924A (en) * | 2015-04-29 | 2015-08-12 | 深圳市共济科技有限公司 | Serial automatic addressing method and system of lead storage battery internal resistance detection modules |
| CN107239047A (en) * | 2016-03-29 | 2017-10-10 | 华为技术有限公司 | Battery management system and the method for numbering serial to battery detection unit |
| CN106019160A (en) * | 2016-05-13 | 2016-10-12 | 福建省汽车工业集团云度新能源汽车股份有限公司 | Electric vehicle battery management system with AC internal resistance inspection function and detection method |
| CN107561450A (en) * | 2017-08-07 | 2018-01-09 | 漳州科华技术有限责任公司 | A kind of monomer battery voltage measurement apparatus and method |
| CN108196192A (en) * | 2017-12-21 | 2018-06-22 | 广东电网有限责任公司东莞供电局 | Storage battery internal resistance On-line Measuring Method |
| CN108169693A (en) * | 2018-03-21 | 2018-06-15 | 国家电网公司 | A kind of accumulator group online evaluation detecting system |
| CN108761350A (en) * | 2018-08-24 | 2018-11-06 | 中国科学技术大学 | A kind of fuel cell pack monomer voltage polling system with start and stop Balance route |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111983490A (en) * | 2020-08-20 | 2020-11-24 | 云蜂数智物联网有限公司 | Nuclear capacity test system, method and device |
| CN111983490B (en) * | 2020-08-20 | 2023-09-01 | 云蜂数智物联网有限公司 | Nuclear capacity testing system, method and device |
| CN113489086A (en) * | 2021-06-11 | 2021-10-08 | 王灏 | Refined state control system and method for matrix battery module |
| CN113406516A (en) * | 2021-07-16 | 2021-09-17 | 山东泰开自动化有限公司 | Storage battery internal resistance on-line monitoring device based on low-current pulse discharge method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110716147A (en) | Method and device for measuring internal resistance of battery pack | |
| CN102156265B (en) | Device and method for testing health state of battery | |
| EP2629391B1 (en) | Method and system for setting up sequential ids for multiple slaves of a battery pack | |
| JP5610652B2 (en) | Capacitor control circuit | |
| JP6033155B2 (en) | Battery control device | |
| US9222986B2 (en) | Distributed battery management system and method of identification distribution using the same | |
| CN105510833B (en) | Accumulator method for detecting health status, apparatus and system | |
| CN110632914A (en) | Automatic tester for detecting vehicle control unit | |
| KR102101910B1 (en) | Method for avoiding id duplicate allocation of battery module | |
| CN110687458A (en) | Terminal battery electric quantity determination method and device | |
| CN109143072A (en) | A kind of test method of battery management system, device and equipment | |
| CN102680908B (en) | Battery status detection record analyzer and control method | |
| CN112834936A (en) | Battery charging and discharging test method, device and system and battery management system | |
| CN111781521A (en) | Method for detecting storage battery of vehicle and battery detection equipment | |
| KR20210048318A (en) | Battery management system and id assigning method thereof | |
| CN107505494B (en) | Method and device for collecting voltage of single power supply | |
| JP2017034814A (en) | Power storage device and power management device | |
| CN113382461B (en) | Wireless passive sensor and wireless communication parameter test method thereof | |
| CN211528668U (en) | Voltage ripple detection device and system | |
| CN112596578A (en) | Clock monitoring circuit and monitoring method | |
| CN110764044A (en) | Voltage ripple detection device, system and detection method thereof | |
| CN110867551A (en) | Spare battery BBU | |
| CN117607717A (en) | Distributed storage battery internal resistance determination method and system | |
| CN110108978A (en) | A kind of FTU accuracy test system and its test point detecting method | |
| CN103048627B (en) | Matching method for storage battery matching instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200121 |
|
| RJ01 | Rejection of invention patent application after publication |