CN106443490A - A fault diagnosis system for battery short-circuiting - Google Patents

A fault diagnosis system for battery short-circuiting Download PDF

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Publication number
CN106443490A
CN106443490A CN201611019758.5A CN201611019758A CN106443490A CN 106443490 A CN106443490 A CN 106443490A CN 201611019758 A CN201611019758 A CN 201611019758A CN 106443490 A CN106443490 A CN 106443490A
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China
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described
control end
voltage
part
battery
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CN201611019758.5A
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Chinese (zh)
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CN106443490B (en
Inventor
郑岳久
孔祥栋
周龙
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上海理工大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery

Abstract

The present invention provides a fault diagnosis system for battery short-circuiting, and is used for detecting short-circuiting of batteries in a battery module. The fault diagnosis system comprises at least one sub-control terminal. The battery module includes a plurality of batteries. The sub-control terminal includes a voltage acquisition part, a voltage calculation part, a first determination part, a sub-control terminal detection part, a second determination part, a sub-control terminal opening part and an information transmission part. The master control terminal comprises a master control terminal receiving part, a master control terminal opening part and a caution part. According to the fault diagnosis system of the invention, the voltage acquisition part, the voltage calculation part, the first determination part, the sub-control terminal detection part and the second determination part are still in an active state when the master control terminal is dormant and the sub-control terminal is low in power consumption, so that real-time detection of all the batteries can be carried out, and short-circuiting warn can be given when an electric automobile is in a shutdown state.

Description

A kind of fault diagnosis system of battery short circuit

Technical field

The invention belongs to cell art is and in particular to a kind of fault diagnosis system of battery short circuit.

Background technology

In the face of the dual-pressure of environment and resource, electric automobile becomes more and more popular, the power battery pack conduct of electric automobile The power source of electric automobile, is to be made up of hundreds of battery cell connection in series-parallel, and battery short circuit gently then reduces battery capacity, shadow Ring the uniformity of battery pack, heavy then initiation battery-heating explodes, and forms thermal runaway, ultimately cause serious in on-vehicle battery group Automobile safety accident.

The positive pole of battery and negative pole interconnective improper path in the case of resistance very little, referred to as battery is short Road, is divided into external short circuit and internal short-circuit according to short-circuit mode.Can simply be interpreted as a wire directly by battery during external short circuit Both positive and negative polarity be connected, the battery of electric automobile there may be external short circuit in use, including voltage measurement line or battery The equilibrium micro-short circuit that electric leakage leads to when breaking down and unexpected because water inlet, maintenance are improper and surrounding components come off etc. cause Larger external short circuit.Because barrier film function loses the ability preventing electronics from passing through during internal short-circuit, lead to electronics in inside battery From the phenomenon becoming loop.Lithium battery is improper because of manufacturing process in process of production, has been mixed into the materials such as dust and burr, can be with Metacneme damages and hides some dangers for, and ultimately forms internal short-circuit, and because some cause specifics such as machinery shakes during lithium battery uses Dynamic, high temperature, low temperature, overcharging, crossing the induction adverse circumstances such as putting it is also possible to damage barrier film function, thus causing short in battery Road.

Most battery short circuits are slow induction processes, and its initial stage phenomenon is inconspicuous, and some bursts Short circuit, the such as internal short-circuit of the external trigger such as collision, or directly stronger external short circuit, need battery management system can make in time Go out to judge.This battery short circuit necessarily occurs in driving conditions, in the case that electric automobile is in start it is equally possible to There is the short circuit problem of burst, if now battery management system is in the state of shutdown, then this short trouble will be unable to examine Measure, now battery pack will have larger security risk, accordingly, it would be desirable to battery management system is examined in real time to battery Survey.

In prior art, judge whether battery occurs in that internal short-circuit according to the voltage drop of battery after the standing that charges:To list Body battery is charged so that the state-of-charge of cell reaches the first preset value, after standing the first Preset Time, by prison The pressure drop surveying each cell screens out out the battery core of generation internal short-circuit;The state-of-charge of each cell after screening out is adjusted Whole is the second preset value;The cell of described second preset value is assembled into battery module, and described battery module is carried out Charge so that the state-of-charge of described battery module reaches the 3rd preset value;By described battery module standing the under preset temperature Two Preset Times, and judge whether that internal short-circuit occurs by judging the pressure drop of described battery module.The method interferes user to charge, It is difficult in practice, diagnoses for offline, and this technology is not implemented sudden short circuit detection under power down condition.

Content of the invention

For solving the above problems, present invention employs following technical scheme:

The present invention provides a kind of fault diagnosis system of battery short circuit, for detecting the short of battery cell in battery module Road is it is characterised in that include:At least one sub- control end, sub- control end is corresponded with battery module;And main control end, by logical Communication network is connected with son control end, and wherein, battery module comprises multiple battery cells, and sub- control end includes:Voltage acquisition unit, potentiometer Calculation portion, the first judging part, sub- control end test section, the second judging part, sub- control end open portion and information sending part, main control end bag Include:Main control end acceptance division, main control end open portion, main control end processing unit and warning part, voltage acquisition unit is used for obtaining battery list The information of voltage of body;Voltage calculating part is calculated according to preordering method based on information of voltage, obtains difference voltage difference value;The One judging part is used for judging whether difference voltage difference value is less than predetermined threshold;When difference voltage differential value is not less than predetermined threshold When, sub- control end test section is detected, generates detection information and wakes up information;Second judging part judges the running status at son control end Whether it is in low-power consumption mode;When the running status at group control end is in low-power consumption mode, sub- control end open portion is according to wake-up letter Breath promoter control end;Detection information and wake-up information are sent to main control end by information sending part;Main control end acceptance division receive information Detection information and wake-up information that sending part is sent;Main control end open portion starts main control end according to the information of wake-up;Main control end is processed Portion generates warning processing information according to detection information;Warning part is warned according to warning processing information.

A kind of fault diagnosis system of battery short circuit that the present invention provides, also has following technical characteristic:Wherein, when first When judging part judges that difference voltage difference value is less than predetermined threshold, voltage acquisition unit reacquires the information of voltage of battery cell.

A kind of fault diagnosis system of battery short circuit that the present invention provides, also has following technical characteristic:Wherein, when second When judging part judges that the running status at son control end is not at low-power consumption mode, detection information and wake-up information are sent out by information sending part Give main control end.

A kind of fault diagnosis system of battery short circuit that the present invention provides, also has following technical characteristic:Wherein, predetermined party Method comprises the steps:

Step 1, calculates the average voltage of the voltage of all battery cells of each battery module respectively:

Wherein, k is current time, and n is the quantity of battery cell, UiK () is i-th battery cell electricity in current time Pressure, UmK () is the average voltage of the voltage of all battery cells of each battery module;

Step 2, calculates the difference voltage of each battery cell:

Ud,i(k)=Ui(k)-Um(k),

Wherein, Ud,iK () is i-th battery cell difference voltage in current time;

Step 3, calculate each battery cell current time with a moment difference voltage difference value dUd,i(k):

dUd,i(k)=Ud,i(k)-Ud,i(k-1),

Wherein, dUd,i(k) be i-th battery cell current time with a moment difference voltage difference value, k-1 is The upper moment of current time k.

A kind of fault diagnosis system of battery short circuit that the present invention provides, also has following technical characteristic:Wherein, predetermined threshold It is worth for-xR, R is the average internal resistance of battery, and the value of x is 5~15 constant.

Invention effect and effect

A kind of fault diagnosis system of the battery short circuit according to the present invention, due in main control end dormancy, sub- control end low-power consumption In the state of, voltage acquisition unit, voltage calculating part, the first judging part, sub- control end test section and the second judging part are still within work Make state, it is possible to real-time detection is carried out to all battery cells, remain able to carry out short under electric automobile off-mode Guard shows.On the other hand, because every height control end makes individually to measure, calculates, judging and sends information, so working as each Son control end detects when being short-circuited, and all sends detection information to main control end, thus main control end can occur in locating batteries bag The battery cell of internal short-circuit.Input condition needed for the fault diagnosis system of the present invention is less and for the having of battery management system Data is it is not necessary to increase hardware, and is easily implantable in existing battery management system.In addition, the fault diagnosis system of the present invention The hardware resource that system takies battery management system in running is less.

Brief description

Fig. 1 is the block diagram of the fault diagnosis system of the battery short circuit of the present invention;

Fig. 2 is the block diagram at the son control end of the present invention;

Fig. 3 is the block diagram of the main control end of the present invention;

Fig. 4 is the Troubleshooting Flowchart of the battery short circuit of the present invention.

Specific embodiment

Embodiment below in conjunction with a kind of method for diagnosing faults of battery short circuit to the present invention for the accompanying drawing is carried out in detail Bright.

Fig. 1 is the block diagram of the battery management system of the present invention.

As shown in figure 1, the fault diagnosis system 1 of battery short circuit is used for detecting the short circuit of the battery cell in battery module, Including many height control end 11 and main control end 13.

Fig. 2 is the block diagram at the son control end 11 of the present invention.

As shown in Fig. 2 communication line 2 battery module corresponding with battery bag 3 is passed through at every height control end connecting, measurement electricity The voltage of the battery cell in the module of pond, every height control end 11 is connected with main control end also by communication line 12.Every height control end 11 all include voltage acquisition unit 14, temporary storage part 22, pre-value storage part 21, voltage calculating part 15, the first judging part 16, the inspection of sub- control end Survey portion 17, the second judging part 18, sub- control end open portion 19, information sending part 20 and the son control end control unit controlling above each portion 23.

Voltage acquisition unit 14 is used for obtaining the information of voltage of all battery cells, and information of voltage is stored in temporary storage part 22 In.

Pre-value storage part 21 is used for storing predetermined threshold and preordering method, and preordering method comprises the steps:

Step 1, calculates the average voltage of the voltage of all battery cells of each battery module respectively:

Wherein, k is current time, and n is the quantity of battery cell, UiK () is i-th battery cell electricity in current time Pressure, UmK () is the average voltage of the voltage of all battery cells of each battery module;

Step 2, calculates the difference voltage of each battery cell:

Ud,i(k)=Ui(k)-Um(k),

Wherein, Ud,iK () is i-th battery cell difference voltage in current time;

Step 3, calculate each battery cell current time with a moment difference voltage difference value dUd,i(k):

dUd,i(k)=Ud,i(k)-Ud,i(k-1),

Wherein, dUd,i(k) be i-th battery cell current time with a moment difference voltage difference value, k-1 is The upper moment of current time k.

Voltage calculating part 15 obtains the voltage of all battery cells from temporary storage part 22, and calculates all batteries based on this voltage The average voltage of the voltage of monomer, and average voltage is stored in temporary storage part 22, from temporary storage part 22, then obtain averagely electricity Pressure, and the difference voltage of all battery cells is calculated based on this average voltage, and difference voltage is stored in temporary storage part 22, Difference voltage is obtained afterwards from temporary storage part 22, and the difference voltage difference value based on this difference voltage all battery cells of calculating, And difference voltage difference value is stored in temporary storage part 22.

First judging part 16 obtains the predetermined threshold of pre-value storage part 21 and the difference voltage difference value of temporary storage part 22, and sentences Whether offset different voltage difference score value is less than predetermined threshold.

When difference voltage differential value is not less than predetermined threshold, it is short whether sub- control end test section 17 detection battery cell occurs Road, obtains testing result, and generates detection information according to testing result and wake up information, and detection information and wake-up information are deposited Storage is in temporary storage part 22.

Second judging part 18 is used for judging whether the running status at sub- control end 11 is in low-power consumption mode.

When the running status at group control end 11 is in low-power consumption mode, sub- control end open portion 19 obtains from temporary storage part 22 and wakes up Information, and according to wake-up information promoter control end 11.

When the running status at when group control end 11 is activated or son control end 11 is not at low-power consumption mode, information sending part 20 obtain wake-up information from temporary storage part 22 and wake up information, and send it to main control end 13.

Son control end control unit 23 comprises control voltage acquisition unit 14, temporary storage part 22, pre-value storage part 21, voltage calculating part 15th, the first judging part 16, sub- control end test section 17, the second judging part 18, sub- control end open portion 19 and information sending part 20 are transported The computer program of row.

Fig. 3 is the block diagram of the main control end 13 of the present invention.

As shown in figure 3, main control end 13 passes through communication network 12 being connected with son control end 11, including main control end acceptance division 24, master Control end open portion 25, main control end processing unit 26, warning part 27 and the main control end control unit 28 controlling above each portion.

Main control end acceptance division 24 is used for receiving detection information and the wake-up information that the information sending part 20 at sub- control end 11 is sent.

Main control end open portion 25 obtains the wake-up information of main control end acceptance division 24, and starts main control end according to the information of wake-up 13.

Main control end processing unit 26 obtains the detection information of main control end acceptance division 24, and generates warning process according to detection information Information.

Warning part 27 obtains the warning processing information of main control end processing unit 26, and warning processing information is uploaded to automotive meter Dial plate shows.

Main control end control unit 28 comprise control main control end acceptance division 24, main control end open portion 25, main control end processing unit 26 with And the computer program that warning part 27 is run.

Fig. 4 is the Troubleshooting Flowchart of the battery short circuit of the present invention.

As shown in figure 4, the fault diagnosis flow scheme of the battery short circuit of the present invention is as follows:

Step S1:The voltage acquisition unit at every height control end obtains the voltage U in current time for all battery cellsi(k), so Enter step S2 afterwards.

Step S2:Voltage calculating part is according to formulaCalculate all battery cells in current time Voltage average voltage UmK (), subsequently into step S3.

Step S3:Voltage calculating part is according to formula Ud,i(k)=Ui(k)-UmK (), calculates each battery cell when current Between difference voltage Ud,iK (), subsequently into step S4.

Step S4:Voltage calculating part is according to formula dUd,i(k)=Ud,i(k)-Ud,i(k-1), calculate each battery cell to exist Current time and the difference voltage difference value dU in a upper momentd,iK (), subsequently into step S5.

Step S5:First judging part judges difference voltage difference value dUd,iK whether () be less than predetermined threshold, works as difference voltage When difference value is less than predetermined threshold, enter step S1;When difference voltage differential value is not less than predetermined threshold, enter step S6.

Step S6:Son control end test section is detected, and generates detection information and wake-up information, subsequently into step S7.

Step S7:Second judging part judges whether the running status at son control end is low-power consumption mode, the operation at group control end When state is low-power consumption mode, enter step S8;When the running status at group control end is not low-power consumption mode, enter step S9.

Step S8:Son controls end open portion according to waking up information promoter control end, subsequently into step S9.

Step S9:Detection information and wake-up information are sent to main control end by information sending part, subsequently into step S10.

Step S10:Main control end acceptance division receives detection information and wakes up information, subsequently into step S11.

Step S11:Main control end open portion starts main control end according to the information of wake-up, subsequently into step S12.

Step S12:Main control end processing unit generates warning processing information according to detection information, subsequently into step S13.

Step S13:Warning part is warned according to warning processing information, subsequently into done state.

Embodiment effect and effect

A kind of fault diagnosis system of battery short circuit that the present embodiment provides, due in main control end dormancy, the low work(in sub- control end In the state of consumption, voltage acquisition unit, voltage calculating part, the first judging part, sub- control end test section and the second judging part are still within Working condition, it is possible to carrying out real-time detection to all battery cells, remains able to carry out under electric automobile off-mode Short circuit warning.On the other hand, because every height control end makes individually to measure, calculates, judging and sends information, so when every Height control end detects when being short-circuited, and all sends detection information to main control end, thus main control end can go out in locating batteries bag The battery cell of existing internal short-circuit.Input condition needed for the fault diagnosis system of the present embodiment is less and for battery management system Data with existing is it is not necessary to increase hardware, and is easily implantable in existing battery management system.In addition, the fault of the present invention is examined The hardware resource that disconnected system takies battery management system in running is less.

Claims (5)

1. a kind of fault diagnosis system of battery short circuit, for detecting the short circuit of the battery cell in battery module, its feature exists In, including:
At least one sub- control end, described sub- control end is corresponded with described battery module;And
Main control end, is connected with described sub- control end by communication network,
Wherein, described battery module comprises multiple described battery cells,
Described sub- control end includes:Voltage acquisition unit, voltage calculating part, the first judging part, sub- control end test section, the second judging part, Son control end open portion and information sending part,
Described main control end includes:Main control end acceptance division, main control end open portion, main control end processing unit and warning part,
Described voltage acquisition unit is used for obtaining the information of voltage of described battery cell;
Described voltage calculating part is calculated according to preordering method based on described information of voltage, obtains difference voltage difference value;
Described first judging part is used for judging whether described difference voltage difference value is less than predetermined threshold;
When described difference voltage difference value is not less than described predetermined threshold, described sub- control end test section is detected, generates inspection Measurement information and wake-up information;
Described second judging part judges whether the running status at described sub- control end is in low-power consumption mode;
When the running status at described sub- control end is in described low-power consumption mode, described sub- control end open portion wakes up letter according to described Breath starts described sub- control end;
Described detection information and described wake-up information are sent to described main control end by described information sending part;
Described main control end acceptance division receives described detection information and the described wake-up information that described information sending part is sent;
Described main control end open portion starts described main control end according to described wake-up information;
Described main control end processing unit generates warning processing information according to described detection information;
Described warning part is warned according to described warning processing information.
2. a kind of battery short circuit according to claim 1 fault diagnosis system it is characterised in that:
Wherein, when described first judging part judges that described difference voltage difference value is less than described predetermined threshold, described voltage obtains Portion is taken to reacquire the information of voltage of described battery cell.
3. a kind of battery short circuit according to claim 1 fault diagnosis system it is characterised in that:
Wherein, when the running status that described second judging part judges described sub- control end is not at described low-power consumption mode, described Described detection information and described wake-up information are sent to described main control end by information sending part.
4. a kind of battery short circuit according to claim 1 fault diagnosis system it is characterised in that:
Wherein, described preordering method comprises the steps:
Step 1, calculates the average voltage of the voltage of all described battery cell of each described battery module respectively:
U m ( k ) = Σ i = 1 n U i ( k ) / n ,
Wherein, k is current time, and n is the quantity of described battery cell, UiK () is battery cell described in i-th described current The voltage of time, UmK () is the average voltage of the voltage of all described battery cell of each described battery module;
Step 2, calculates the difference voltage of each described battery cell:
Ud,i(k)=Ui(k)-Um(k),
Wherein, Ud,iK () is the difference voltage in described current time for the battery cell described in i-th;
Step 3, calculate each described battery cell described current time with a moment difference voltage difference value dUd,i (k):
dUd,i(k)=Ud,i(k)-Ud,i(k-1),
Wherein, dUd,i(k) be battery cell described in i-th described current time with described on a moment described difference voltage Difference value, k-1 was the upper moment of described current time k.
5. a kind of battery short circuit according to claim 1 fault diagnosis system it is characterised in that:
Wherein, described predetermined threshold is-xR, and R is the average internal resistance of described battery, and the value of x is 5~15 constant.
CN201611019758.5A 2016-11-21 2016-11-21 A kind of fault diagnosis system of battery short circuit CN106443490B (en)

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