CN104880605A - Battery management system and battery monomer DC internal resistance measuring method - Google Patents
Battery management system and battery monomer DC internal resistance measuring method Download PDFInfo
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- CN104880605A CN104880605A CN201410073563.3A CN201410073563A CN104880605A CN 104880605 A CN104880605 A CN 104880605A CN 201410073563 A CN201410073563 A CN 201410073563A CN 104880605 A CN104880605 A CN 104880605A
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Abstract
The invention provides a method of measuring DC internal resistance of battery monomers in a power battery set, comprising the steps of: sending instructions to a battery information sampler at intervals of preset time by a battery management controller when receiving instructions of measuring DC internal resistance of each battery monomer, and sampling voltages of corresponding battery monomers by the battery information sampler; sampling current of each battery monomer when the battery management controller sends instructions; obtaining a plurality of sets of sampling data of each battery monomer; and calculating DC internal resistance in each battery monomer according to the plurality of sets of sampling data of each battery monomer. The measuring method can guarantee synchronous sampling of current and voltage data of battery monomers so as to accurately measure DC internal resistance in the battery monomers, provide an accurate basis for determining health statuses of all battery monomers, and better guarantee operation safety of an electric automobile. The invention also provides a battery management system for measuring DC internal resistance of battery monomers in a power battery set.
Description
Technical field
The present invention relates to electric vehicle engineering field, particularly a kind of measure the DC internal resistance of battery cell in power battery pack battery management system and a kind of power battery pack in the measuring method of DC internal resistance of battery cell.
Background technology
The BMS(Battery Management System of a kind of electric automobile in correlation technique, battery management system) structural topology as shown in Figure 1, the battery management system of this electric automobile is by 1 BMC(Battery ManagementController, battery management controller) and N number of BIC(Battery Information Collector, battery information collector) jointly form, by CAN(Controller Area Network between BMC and BIC, controller local area network) communicate.This system can be sampled to the temperature of the voltage of the charging and discharging currents of the power battery pack of electric automobile, battery cell, electric battery, is operated in the safety zone of electric battery to make electric automobile.
Wherein, BIC is responsible for voltage and the temperature of the battery cell gathered in electric battery, and BIC internal main will comprise the application-specific integrated circuit of BMS and the MCU of the sampled data of process own; BMC is responsible for gathering charging and discharging currents, and controls whole system.When measuring the DC internal resistance of battery cell, BMC receives the voltage signal that BIC sends, and the current signal collected for twice divided by self by the voltage signal difference of double sampling is poor, to obtain the DC internal resistance of corresponding battery cell.
But the battery management system of the electric automobile in correlation technique there will be larger error when calculating the DC internal resistance of battery cell, measures out of true, need to improve.
In correlation technique, battery management system is when calculating the DC internal resistance of battery cell, independently become a mini system between BMC and each BIC separately to run, each BIC sends the instruction of the DC internal resistance measuring battery cell to the application-specific integrated circuit of correspondence at interval of the time of Δ tv, with to the voltage sample of corresponding surveyed battery cell once, and the voltage data obtained by sampling is saved in the buffer memory of BIC self, and BMC carries out once to the sampling of the electric current of battery cell at interval of the time of Δ ti, also the current data obtained by sampling is saved in the buffer memory of BMC self simultaneously.Therefore, when needing the DC internal resistance measuring battery cell, BMC sends the instruction of reading data to read the voltage data in the buffer memory of BIC, but the voltage data in the buffer memory of BIC is at least the voltage data before the Δ tv time this moment, current data now in BMC buffer memory is then before Δ ti, namely the sampling instant for the voltage data and current data of measuring the DC internal resistance of battery cell is asynchronous, cause the DC internal resistance calculating gained inaccurate, cannot judge to provide foundation accurately for the health status of all battery cells, the security that electric automobile runs can not be ensured well.
Object of the present invention is intended to solve above-mentioned technical matters at least to a certain extent.
For this reason, one object of the present invention is the measuring method of the DC internal resistance proposing battery cell in a kind of power battery pack, the current and voltage data of this measuring method energy synchronization gain battery cell, thus the DC internal resistance of Measurement accuracy battery cell.
Another object of the present invention is to propose a kind of battery management system measuring the DC internal resistance of battery cell in power battery pack.
For achieving the above object, one aspect of the present invention embodiment proposes the measuring method of the DC internal resistance of battery cell in a kind of power battery pack, wherein, described power battery pack comprises multiple battery cell, described measuring method comprises the following steps: when receiving the instruction of the DC internal resistance measuring each described battery cell, described instruction is sent to battery information sampling thief every Preset Time by battery management controller, the voltage of the corresponding battery cell of described battery information sampler samples; Described battery management controller is sampled when sending described instruction the electric current of each described battery cell; Obtain many groups sampled data of each described battery cell, wherein, often organize sampled data and comprise described battery cell at the sample rate current of synchronization and sampled voltage; The DC internal resistance of each described battery cell is calculated according to many groups sampled data of each described battery cell.
According to the measuring method of the DC internal resistance of battery cell in the power battery pack that the embodiment of the present invention proposes, when receiving the instruction of the DC internal resistance measuring each battery cell, this instruction is sent to battery information sampling thief every Preset Time by battery management controller, the voltage of the corresponding battery cell of battery information sampler samples, simultaneously battery management controller is sampled when sending this instruction the electric current of each battery cell, such current and voltage data synchronized sampling that can ensure battery cell, thus can the DC internal resistance of Measurement accuracy battery cell, improve the DC internal resistance measuring accuracy of all battery cells, health status for all battery cells judges to provide foundation accurately, ensure the security that electric automobile runs better.
A kind of battery management system measuring the DC internal resistance of battery cell in power battery pack that the present invention's another aspect embodiment proposes, comprise battery information sampling thief and battery management controller, wherein, described battery information sampling thief, for the voltage of corresponding battery cell of sampling, described battery management controller is when receiving the instruction of the DC internal resistance measuring each described battery cell, every Preset Time, described instruction is sent to described battery information sampling thief, the voltage of the corresponding battery cell of described battery information sampler samples, the electric current of each described battery cell and described battery management controller is sampled when sending described instruction, and described battery management controller obtains many groups sampled data of each described battery cell, and the DC internal resistance of each described battery cell is calculated according to many groups sampled data of each described battery cell, wherein, often organize sampled data and comprise described battery cell at the sample rate current of synchronization and sampled voltage.
According to the battery management system of the DC internal resistance of battery cell in the measurement power battery pack of the embodiment of the present invention, battery management controller is when receiving the instruction of the DC internal resistance measuring each battery cell, every Preset Time, this instruction is sent to battery information sampling thief, the voltage of the corresponding battery cell of battery information sampler samples, simultaneously battery management controller is sampled when sending this instruction the electric current of each battery cell, such current and voltage data synchronized sampling that can ensure battery cell, thus can the DC internal resistance of Measurement accuracy battery cell, improve the DC internal resistance measuring accuracy of all battery cells, health status for all battery cells judges to provide foundation accurately, ensure the security that electric automobile runs better.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Summary of the invention
The application makes the understanding of following problem and discovery based on inventor:
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the structural topology figure according to a kind of battery management system in correlation technique;
Fig. 2 is the process flow diagram of the measuring method of the DC internal resistance of battery cell in the power battery pack according to the embodiment of the present invention;
Fig. 3 be according to an embodiment of the invention electric current and voltage synchronous sampling and data sampling asynchronous time voltage and current curve synoptic diagram;
Fig. 4 is the block diagram of the battery management system of the DC internal resistance of battery cell in the measurement power battery pack according to the embodiment of the present invention; And
Fig. 5 is the structural topology figure of the battery management system of the DC internal resistance measuring battery cell in power battery pack in accordance with another embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present invention.Of the present invention open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the present invention.In addition, the present invention can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the invention provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In describing the invention, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
Below before the measuring method of DC internal resistance describing battery cell in the power battery pack proposed according to the embodiment of the present invention and the battery management system of the DC internal resistance of battery cell in measurement power battery pack, the importance of the DC internal resistance of Measurement accuracy battery cell once is simply described first.
In power battery pack, the DC internal resistance of battery cell is with the SOH(State of Health of battery cell, health status) change, the DC internal resistance externally showing as battery cell in power battery pack increases with the cell degradation order of severity, and therefore in power battery pack, the DC internal resistance of battery cell is the key of the SOH judging battery cell.Meanwhile, in power battery pack, the size of the resistance of the DC internal resistance of battery cell is also relevant with the charge-discharge electric power ability of battery cell.Specifically, when the resistance of the DC internal resistance of battery cell is larger, the use power that battery cell allows is lower, if the use power of battery cell is more than the limit value of battery cell power, namely beyond electrokinetic cell safe operating area, then battery cell inner both positive and negative polarity generation subsidiary reaction is probably caused, the positive and negative pole material of loss battery cell, aggravation battery cell is aging, even causes safety problem.It can thus be appreciated that the DC internal resistance of battery cell is the important parameter that electrokinetic cell safe operating area delimited in power battery pack.
Usually Transient Analysis is adopted to the measurement of the DC internal resistance of battery cell, namely use the magnitude of voltage of transition divided by the current value of transition to calculate the DC internal resistance of battery cell.For obtaining the DC internal resistance of battery cell accurately, requiring that the moment of the voltage and current of sampling keeps synchronous, if the electric current and voltage of sampling is asynchronous, the inaccurate of measurement result will be caused.
The present invention just based on the problems referred to above, and proposes the measuring method of the DC internal resistance of battery cell in a kind of power battery pack and a kind of battery management system measuring the DC internal resistance of battery cell in power battery pack.
Just with reference to accompanying drawing, the measuring method of the DC internal resistance of battery cell in the power battery pack proposed according to the embodiment of the present invention and the battery management system of the DC internal resistance of battery cell in measurement power battery pack are described below.
Fig. 2 is the process flow diagram of the measuring method of the DC internal resistance of battery cell in the power battery pack according to the embodiment of the present invention.Wherein, power battery pack comprises multiple battery cell.With reference to shown in Fig. 2, in this power battery pack, the measuring method of the DC internal resistance of battery cell comprises the following steps:
S1: when receiving the instruction of the DC internal resistance measuring each battery cell, instruction is sent to battery information sampling thief every Preset Time by battery management controller, the voltage of the corresponding battery cell of battery information sampler samples.
S2: battery management controller is sampled when sending instruction the electric current of each battery cell.
According to one embodiment of present invention, battery information sampling thief can be multiple, the voltage of one or several battery cell of each battery information sampling thief correspondence sampling, wherein, specifically the sample voltage of several battery cell of battery information sampling thief depends on the characteristic of BMS application-specific integrated circuit itself.
In an embodiment of the present invention, the holistic management work of battery management controller primary responsibility power battery pack.When battery management system needs the DC internal resistance measuring battery cell in power battery pack, battery management controller receives the instruction of the DC internal resistance measuring each battery cell, the temporary transient task of stopping other of battery management controller meeting, then send the instruction of surveying DC internal resistance to each battery information sampling thief and namely " survey internal resistance mode command " to all battery information collector broadcast transmissions, the voltage of the corresponding battery cell of each battery information sampler samples, measurement result is recorded in voltage sample array.And, battery management controller is while sending instruction to each battery information sampling thief, battery management controller is sampled the electric current of each battery cell, namely battery management controller self starts to measure primary current value, measurement result is recorded in current sample array, and then runs battery management controller other tasks originally.
Wherein, according to one embodiment of present invention, battery information sampling thief comprises micro-control unit and sampling unit and application-specific integrated circuit, and battery information sampling thief is connected to carry out CAN communication with described battery management controller.And, the multiple task of described micro-control unit internal operation, the priority of the measurement DC internal resistance task in wherein said multiple task is the highest, and when described battery information sampling thief receives described instruction, described micro-control unit interrupts making described measurement DC internal resistance task ready by CAN.
That is, under general operational mode, battery information sampling thief needs to perform voltage sample, temperature sampling, balanced execution, carry out the tasks such as CAN communication with battery management controller.Wherein, kernel can be divided to be equipped with by embedded system μ C/OS and makes full use of its resource by the micro-control unit of battery information sampling thief, and therefore micro-control unit inside is a point multiple tasks carrying, and each task has respective priority.
In one embodiment of the invention, in the program of micro-control unit, set up one measure DC internal resistance task, and the priority of this task is set to the highest, namely when battery information sampling thief to receive the DC internal resistance of each battery cell of measurement that battery management controller sends instruction by CAN " surveys internal resistance mode command ", micro-control unit in battery information sampling thief is interrupted by CAN, to make to measure DC internal resistance task ready, because this task has the highest priority, therefore will perform at once after measuring DC internal resistance task ready, after micro-control unit enters task, micro-control unit is at once to the sampling unit issue an order of correspondence, sampling unit starts the voltage of battery cell corresponding to sampling, and sampled result is recorded in voltage sample array.In addition, after measuring DC internal resistance tasks carrying, battery information sampling thief returns original general modfel, and waits for the arrival of next time measuring DC internal resistance task ready.
In an embodiment of the present invention, after interval Preset Time such as Yms, battery management controller temporarily can stop other task again, then sends the instruction of surveying DC internal resistance to each battery information sampling thief and namely " surveys internal resistance mode command " to all battery information collector broadcast transmissions.That is, often through the time of Y ms, the instruction of the DC internal resistance measuring each battery cell is sent to each battery information sampling thief by battery management controller again, namely broadcast transmission " surveys internal resistance mode command " again, each battery information sampling thief is sampled the voltage of corresponding battery cell again, repeat above-mentioned steps, at interval of the Y ms time, battery control and management device sends the instruction of the DC internal resistance of each battery cell of one-shot measurement to each battery information sampling thief, measure X data point altogether.Therefore the time that the DC internal resistance measuring battery cell needs altogether is about Y*(X-1) ms.After measurement, battery management controller measures the voltage data of X data point of gained to the request of battery information sampling thief, namely perform step S3.
S3: the many groups sampled data obtaining each battery cell, wherein, often organizes sampled data and comprises battery cell at the sample rate current of synchronization and sampled voltage.
That is, battery management controller obtains the voltage of battery cell from the voltage sample array of each battery information sampling thief, and form one group of sampled data with the electric current obtaining battery cell in the current sample array of synchronization battery management controller, namely often organize sampled data and comprise battery cell at the sample rate current of synchronization and sampled voltage.
S4: the DC internal resistance calculating each battery cell according to many groups sampled data of each battery cell.
In an embodiment of the present invention, battery management controller obtains many groups sampled data of each battery cell, and processes many groups sampled data of each battery cell, to calculate the DC internal resistance of each battery cell.
Further, after battery management controller measures the DC internal resistance of battery cell in power battery pack, the data cached of the DC internal resistance of battery cell is measured in battery management controller release, and battery management system is restored to general operational mode.
In sum, the measuring method of the embodiment of the present invention can ensure the current and voltage data synchronized sampling of battery cell, thus can the DC internal resistance of Measurement accuracy battery cell, and concrete measuring process is as shown in table 1 below.
Table 1
Wherein, in one embodiment of the invention, battery management controller can be sampled by the survey electric current A/D chip of current sensor the electric current of each battery cell.
It should be noted that, in embodiments of the present invention, X will select 2 at least, otherwise cannot obtain voltage difference and difference between current, then cannot calculate the DC internal resistance of battery cell.Particularly, when X is greater than 2, voltage difference and difference between current is obtained according to two often adjacent points, and voltage difference is calculated the resistance of a DC internal resistance divided by difference between current, calculate the resistance of the DC internal resistance of X-1 point altogether, the last resistance being averaging the DC internal resistance obtaining battery cell according to X data point, namely the mean value of the DC internal resistance of X-1 point is the resistance of the DC internal resistance of last battery cell.Wherein, the maximum upper limit of X point can be chosen according to actual current situation of change and micro-control unit configuration.
And, when measuring the DC internal resistance of battery cell, measurement point time interval Y and Preset Time are required of to the point of curent change, if current constant, then difference between current is zero, and the denominator of computing formula is zero, then cannot calculate, therefore the DC internal resistance of battery cell is not under any circumstance can measure, and should measure when curent change.But in the ordinary course of things, the change of electric current is unpredictable, therefore in actual applications, when the curent change of power battery pack, such as at battery charging phase, battery management system and charging set communication, when charging current changes, send instruction to battery management controller, battery management controller enters surveys internal resistance pattern.Namely, when the curent change of described power battery pack, described instruction is sent to described battery management controller.
In another embodiment of the present invention, battery information sampling thief can be multiple, each battery information sampling thief comprises sampling unit, multiple battery information sampling thief is connected in series, and adopts default differential communication to carry out data interaction between multiple battery information sampling thief and battery management controller.
Each battery information sampling thief only includes sampling unit, is namely different from the structure that above-mentioned each battery information sampling unit comprises micro-control unit and sampling unit.Wherein, multiple battery information sampling thief is connected in series, namely the sampling unit of each battery information sampling thief is connected in series, battery management controller is still responsible for the sampling of electric current and the control of whole system, the communication modes between the sampling unit of battery management controller and battery information sampling thief by distinctive differential communication to carry out data interaction.Sampling unit is responsible for the voltage of sample temperature and battery cell, is a mode connected in series between each sampling unit, adopts differential communication unique separately to carry out data interaction.
Based on the battery management system of above structure, when needing the DC internal resistance measuring battery cell in power battery pack, perform step as follows:
S11: battery management system exits general operational mode, battery management controller stops the sampling to electric current, and sampling unit stops the voltage of battery cell and the sampling of temperature.
S12: battery management system starts surveys internal resistance pattern, battery management controller starts to perform measures DC internal resistance task, issues startup conversion command, namely enter and survey internal resistance pattern to the survey electric current A/D chip of current sensor and each sampling unit.
S13: battery management controller controls every Preset Time such as sampling should be carried out every Y ms time interval electric current and voltage data, and the data obtained is kept at measure DC internal resistance data buffer storage array in, sampled data points X altogether.
S14: after battery management controller gathers complete X point, after battery management controller calculates the DC internal resistance of each battery cell according to many group sampled datas, it is data cached that DC internal resistance is measured in release, and battery management system is restored to general operational mode.
Therefore, only include the structure of sampling unit at battery information sampling thief under, when battery management system measures the DC internal resistance of battery cell, eliminate namely battery management controller sends stage from instruction to battery information sampling thief transmitting order to lower levels, synchronism is better.In addition, the communication speed between multiple sampling unit is (Mbps) quickly, and after receiving orders, mutual time delay is μ s rank, and can think that multiple sampling unit is synchronous, synchronous effect is good.
In sum, in the measuring process of the DC internal resistance of actual battery monomer, with reference to shown in Fig. 3, U
realbe the virtual voltage data synchronous with electric current I, choose two data point (I
0, U
real0) and (I
1, U
real1), then the DC internal resistance of actual battery cell is: R
real=((U
real1-U
real0)/(I
1-I
0)); If the moment that voltage data and current data are sampled is asynchronous, the part that caused voltage data to move horizontally, thus the DC internal resistance of the battery cell causing actual measurement to obtain is R
test=((U
test1– U
test0)/(I
1-I
0)), with reference to shown in Fig. 3, obvious R
real≠ R
test.And if the interval in the moment of sampling between voltage data and current data is long and battery is used in dynamic operation condition when, the DC internal resistance of the battery cell that BMS even may be caused to calculate is a negative electricity resistance, cannot judge to provide foundation accurately for the health status of all battery cells, the security that electric automobile runs can not be ensured well.And synchronous current and voltage data can be obtained by the measuring method of the embodiment of the present invention, thus can the DC internal resistance of battery cell in Measurement accuracy power battery pack.
According to the measuring method of the DC internal resistance of battery cell in the power battery pack that the embodiment of the present invention proposes, when receiving the instruction of the DC internal resistance measuring each battery cell, this instruction is sent to each battery information sampling thief every Preset Time by battery management controller, the voltage of each battery information sampler samples one or several battery cell corresponding, simultaneously battery management controller is sampled when sending this instruction the electric current of each battery cell, such current and voltage data synchronized sampling that can ensure battery cell, thus can the DC internal resistance of Measurement accuracy battery cell, improve the DC internal resistance measuring accuracy of all battery cells, health status for all battery cells judges to provide foundation accurately, ensure the security that electric automobile runs better.
With reference to shown in Fig. 4, in the measurement power battery pack of the embodiment of the present invention, the battery management system 100 of the DC internal resistance of battery cell comprises battery management controller 200 and battery information sampling thief 300.
Wherein, battery information sampling thief 300 is for the voltage of corresponding battery cell of sampling.Battery management controller 200 is when receiving the instruction of the DC internal resistance measuring each battery cell, every Preset Time, instruction is sent to battery information sampling thief 300, battery information sampling thief 300 is sampled the voltage of corresponding battery cell, the electric current of each battery cell and battery management controller 200 is sampled when sending instruction, and battery management controller 200 obtains many groups sampled data of each battery cell, and the DC internal resistance of each battery cell is calculated according to many groups sampled data of each battery cell, wherein, often organize sampled data and comprise battery cell at the sample rate current of synchronization and sampled voltage.The synchronous current and voltage data of such basis calculates the DC internal resistance of battery cell, can the DC internal resistance of battery cell in Measurement accuracy power battery pack, substantially increases measuring accuracy.
According to one embodiment of present invention, as shown in Figure 4, battery information sampling thief 300 can be multiple, the voltage of each one or several battery cell 400 of battery information sampling thief 300 correspondence sampling.Wherein, the voltage of the several battery cell of the concrete sampling of each battery information sampling thief 300 depends on the characteristic of BMS application-specific integrated circuit itself.
Wherein, according to one embodiment of present invention, battery information sampling thief comprises micro-control unit and sampling unit and application-specific integrated circuit, and each described battery information sampling thief is connected to carry out CAN communication with described battery management controller respectively.And, the multiple task of described micro-control unit internal operation, the priority of the measurement DC internal resistance task in wherein said multiple task is the highest, and when described battery information sampling thief receives described instruction, described micro-control unit interrupts making described measurement DC internal resistance task ready by CAN.
That is, under general operational mode, battery information sampling thief needs to perform voltage sample, temperature sampling, balanced execution, carry out the tasks such as CAN communication with battery management controller.Wherein, kernel can be divided to be equipped with by embedded system μ C/OS and makes full use of its resource by the micro-control unit of battery information sampling thief, and therefore micro-control unit inside is a point multiple tasks carrying, and each task has respective priority.Wherein, in the program of micro-control unit, set up one measure DC internal resistance task, and the priority of this task is set to the highest, namely when battery information sampling thief to receive the DC internal resistance of each battery cell of measurement that battery management controller sends instruction by CAN " surveys internal resistance mode command ", micro-control unit in battery information sampling thief is interrupted by CAN, to make to measure DC internal resistance task ready, because this task has the highest priority, therefore will perform at once after measuring DC internal resistance task ready, after micro-control unit enters task, micro-control unit is at once to the sampling unit issue an order of correspondence, sampling unit starts the voltage of battery cell corresponding to sampling, and sampled result is recorded in voltage sample array.In addition, after measuring DC internal resistance tasks carrying, battery information sampling thief returns original general modfel, and waits for the arrival of next time measuring DC internal resistance task ready.
In another embodiment of the present invention, with reference to shown in Fig. 5, battery information sampling thief 300 can be multiple, each battery information sampling thief 300 comprises sampling unit such as IC#1, IC#2 ..., IC#n, multiple battery information sampling thief is connected in series, and adopts default differential communication to carry out data interaction between multiple battery information sampling thief 300 and battery management controller 200.
Each battery information sampling thief only includes sampling unit, is namely different from the structure that each battery information sampling unit comprises micro-control unit and sampling unit.Wherein, multiple battery information sampling thief is connected in series, namely the sampling unit of each battery information sampling thief is connected in series, battery management controller is still responsible for the sampling of electric current and the control of whole system, the communication modes between the sampling unit of battery management controller and battery information sampling thief by distinctive differential communication to carry out data interaction.Sampling unit is responsible for the voltage of sample temperature and battery cell, is a mode connected in series between each sampling unit, adopts differential communication unique separately to carry out data interaction.
Therefore, only include the structure of sampling unit at battery information sampling thief under, when battery management system measures the DC internal resistance of battery cell, eliminate namely battery management controller sends stage from instruction to battery information sampling thief transmitting order to lower levels, synchronism is better.In addition, the communication speed between multiple sampling unit is (Mbps) quickly, and after receiving orders, mutual time delay is μ s rank, and can think that multiple sampling unit is synchronous, synchronous effect is good.
In sum, according to the battery management system of the DC internal resistance of battery cell in the measurement power battery pack that the embodiment of the present invention proposes, battery management controller is when receiving the instruction of the DC internal resistance measuring each battery cell, every Preset Time, this instruction is sent to each battery information sampling thief, the voltage of each battery information sampler samples one or several battery cell corresponding, simultaneously battery management controller is sampled when sending this instruction the electric current of each battery cell, such current and voltage data synchronized sampling that can ensure battery cell, thus can the DC internal resistance of Measurement accuracy battery cell, improve the DC internal resistance measuring accuracy of all battery cells, health status for all battery cells judges to provide foundation accurately, ensure the security that electric automobile runs better.
Describe and can be understood in process flow diagram or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of the preferred embodiment of the present invention comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiments of the invention person of ordinary skill in the field.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this instructions, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random-access memory (ram), ROM (read-only memory) (ROM), erasablely edit ROM (read-only memory) (EPROM or flash memory), fiber device, and portable optic disk ROM (read-only memory) (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanning to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer memory.
Should be appreciated that each several part of the present invention can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the special IC of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be ROM (read-only memory), disk or CD etc.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (9)
1. the measuring method of the DC internal resistance of battery cell in power battery pack, it is characterized in that, described power battery pack comprises multiple battery cell, and described measuring method comprises the following steps:
When receiving the instruction of the DC internal resistance measuring each described battery cell, described instruction is sent to battery information sampling thief every Preset Time by battery management controller, the voltage of the corresponding battery cell of described battery information sampler samples;
Described battery management controller is sampled when sending described instruction the electric current of each described battery cell;
Obtain many groups sampled data of each described battery cell, wherein, often organize sampled data and comprise described battery cell at the sample rate current of synchronization and sampled voltage;
The DC internal resistance of each described battery cell is calculated according to many groups sampled data of each described battery cell.
2. the measuring method of the DC internal resistance of battery cell in power battery pack according to claim 1, is characterized in that, when the curent change of described power battery pack, sends described instruction to described battery management controller.
3. the measuring method of the DC internal resistance of battery cell in power battery pack according to claim 1 and 2, it is characterized in that, described battery information sampling thief comprises micro-control unit and sampling unit, and described battery information sampling thief is connected to carry out CAN communication with described battery management controller.
4. the measuring method of the DC internal resistance of battery cell in power battery pack according to claim 3, it is characterized in that, the multiple task of described micro-control unit internal operation, the priority of the measurement DC internal resistance task in wherein said multiple task is the highest, when described battery information sampling thief receives described instruction, described micro-control unit interrupts making described measurement DC internal resistance task ready by CAN.
5. the measuring method of the DC internal resistance of battery cell in power battery pack according to claim 1 and 2, it is characterized in that, described battery information sampling thief is multiple, each described battery information sampling thief comprises sampling unit, multiple described battery information sampling thief is connected in series, and adopts default differential communication to carry out data interaction between multiple described battery information sampling thiefs and described battery management controller.
6. measure a battery management system for the DC internal resistance of battery cell in power battery pack, it is characterized in that, comprise battery information sampling thief and battery management controller, wherein,
Described battery information sampling thief, for the voltage of corresponding battery cell of sampling;
Described battery management controller is when receiving the instruction of the DC internal resistance measuring each described battery cell, every Preset Time, described instruction is sent to described battery information sampling thief, the voltage of the corresponding battery cell of described battery information sampler samples, the electric current of each described battery cell and described battery management controller is sampled when sending described instruction, and described battery management controller obtains many groups sampled data of each described battery cell, and the DC internal resistance of each described battery cell is calculated according to many groups sampled data of each described battery cell, wherein, often organize sampled data and comprise described battery cell at the sample rate current of synchronization and sampled voltage.
7. the battery management system of the DC internal resistance of battery cell in measurement power battery pack according to claim 6, it is characterized in that, described battery information sampling thief comprises micro-control unit and sampling unit, and described battery information sampling thief is connected to carry out CAN communication with described battery management controller.
8. the battery management system of the DC internal resistance of battery cell in measurement power battery pack according to claim 7, it is characterized in that, the multiple task of described micro-control unit internal operation, the priority of the measurement DC internal resistance task in wherein said multiple task is the highest, when described battery information sampling thief receives described instruction, described micro-control unit interrupts making described measurement DC internal resistance task ready by CAN.
9. the battery management system of the DC internal resistance of battery cell in measurement power battery pack according to claim 6, it is characterized in that, described battery information sampling thief is multiple, each described battery information sampling thief comprises sampling unit, multiple described battery information sampling thief is connected in series, and adopts default differential communication to carry out data interaction between multiple described battery information sampling thiefs and described battery management controller.
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