CN108089133B - Battery pack consistency detection method and detection device for energy storage system - Google Patents

Battery pack consistency detection method and detection device for energy storage system Download PDF

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Publication number
CN108089133B
CN108089133B CN201711223175.9A CN201711223175A CN108089133B CN 108089133 B CN108089133 B CN 108089133B CN 201711223175 A CN201711223175 A CN 201711223175A CN 108089133 B CN108089133 B CN 108089133B
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China
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battery pack
battery
voltage
discharge capacity
discharging
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CN201711223175.9A
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Chinese (zh)
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CN108089133A (en
Inventor
李忠翔
郭鹏亮
毛一洋
阮海明
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深圳市科陆电子科技股份有限公司
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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
    • G01R31/3842Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current 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 invention relates to the technical field of energy storage system detection, in particular to a method and a device for detecting battery pack consistency of an energy storage system. The detection method comprises the following steps: in the charging and discharging process of each battery pack, acquiring the voltage deviation value of each battery monomer in the battery pack at each running moment in real time; counting the voltage deviation value of each battery monomer which is larger than the first threshold value; and (ii) obtaining the consistency result of the battery pack and other battery packs in the energy storage system according to the statistical result of the voltage deviation value obtained in the step (i) or the statistical result of the voltage deviation value obtained in the step (ii) and the discharge capacity of the battery pack after leveling adjustment. The consistency detection method of the battery pack of the energy storage system judges the consistency of the battery pack according to the statistical result of the voltage deviation value of the battery monomer in the battery pack or the statistical result of the voltage deviation value and the discharge capacity of the battery pack after leveling adjustment, can directly find out the battery monomer with problems while carrying out consistency detection, and can know the performance state of the battery pack.

Description

Battery pack consistency detection method and detection device for energy storage system

Technical Field

The invention relates to the technical field of energy storage system detection, in particular to a method and a device for detecting battery pack consistency of an energy storage system.

Background

The energy storage system has the advantages of peak regulation and frequency modulation on a conventional power grid, enhancing the safe and stable operation capability of the power grid, improving the economic operation level of a power system, and being an important means for realizing smooth fluctuation of renewable energy and promoting large-scale consumption and access of the renewable energy. Meanwhile, the energy source system is an important component of a distributed energy system and a smart grid system and plays a significant role in energy internet.

The lithium battery has high energy density and long cycle life, and the voltage of the single battery is increased through series connection, and the capacity is increased through parallel connection, so that the overall energy is increased, and the lithium battery is suitable for an energy storage system. The increase of series-parallel connection series has high requirements on the consistency of the batteries, the consistency of the battery pack must be monitored and certain maintenance measures must be taken during the operation of the energy storage system, otherwise, the charge-discharge depth of the energy storage system is influenced by the inconsistency of the batteries, and the economic benefit of the operation of the energy storage power station is reduced. The prior art generally uses the standard deviation σ of the battery pack voltage as a battery performance evaluation standard, and the specific contents are as follows:

prior art battery pack maintenance strategies can be broadly divided into four types: 1. normally charging and discharging the battery pack; 2. balancing the battery pack; 3. assembling the battery pack; 4. and replacing and regrouping the battery pack. The battery pack voltage standard deviation value sigma can be divided into four levels: when sigma is less than or equal to sigma 1, sampling the maintenance mode 1; when sigma 1 is less than or equal to sigma 2, adopting a maintenance mode 2; when sigma 2 is more than sigma and less than or equal to sigma 3; a maintenance mode 3 is adopted; when σ 3 < σ; maintenance mode 4 is adopted. The battery pack voltage standard deviation σ equation is as follows:

in the formula, n is the total number of the batteries; u shapeiIs representative of the ith cell voltage; uav is the average voltage of the battery. To establish the maximum value d of the voltage difference between the cell voltage and UavmaxAnd sigma, the battery voltage distribution can be considered to conform to a normal distribution rule, and the following steps are carried out under the condition of the given number n of the battery packs.

1) Given normal distribution function

2) The probability of the maximum voltage difference between the monomer voltage and Uav is considered to accord with the 3 sigma rule, namely when the voltage difference is dmaxCorresponding to the position where x is +/-3 in the formula (3), the probability of the occurrence of the voltage difference of the n batteries is uniformly distributed in [ -3,3]Above, there are

In the formula (d)iThe voltage difference between the ith battery voltage and Uav.

3) According to equation (4), it can be calculated that when a cell voltage difference reaches the threshold value dmaxThe standard deviation sigma of the battery pack is

Battery consistency first stage evaluation curve acquisition method: taking the performance state of the battery just before delivery as a reference to obtain a battery pack charge-discharge curve as a first-stage evaluation curve;

battery consistency second stage evaluation curve acquisition method: considering that the performance of the second-stage batteries is not damaged, and only the batteries are inconsistent, so that the second-stage evaluation curve translates upwards by 0.03V to the vertical coordinate according to the first stage to obtain a second-stage evaluation curve;

battery consistency third-stage evaluation curve obtaining method: the performance of the batteries at this stage is damaged, the maximum value of the average voltage difference between the battery pack and the battery pack is larger than that at the second stage, meanwhile, the maximum value of the voltage difference at the end stage of the charging process/discharging process is increased in advance, the relationship of the advance amplitude is as follows, and lambda is 95%:

gd(λ(1-λ)=0.01+fd(1-x) (6)

gc(λx)=0.01+fc(x) (7)

battery pack consistency fourth stage evaluation curve obtaining method: the battery performance is further compromised and the voltage difference at the end of the charge/discharge phase is related to SOC as follows, λ ═ 90%:

gd(λ(1-λ)=0.03+fd(1-x) (8)

gc(λx)=0.03+fc(x) (9)

and obtaining evaluation curves of the four stages, drawing a standard deviation-SOC curve, calculating the standard deviation of the voltage of each battery pack in real time according to the actual operation process, comparing and judging the consistency condition of the batteries, and performing different maintenance strategies.

The prior art has the following defects: firstly, after the standard deviation is calculated, the relation between dmax and sigma is calculated, the voltage distribution is assumed to be normal distribution, and actually not normal distribution; secondly, the values of sigma 1, sigma 2 and sigma 3 are not judged by a judgment method, but are translated by a normal consistency curve, lambda values are estimated, and evaluation curves in different intervals are speculated, so that the judgment of the sigma-located stage is not accurate, and a corresponding maintenance scheme cannot be accurately provided; thirdly, because the performance characteristics of the lithium battery have no reasonable model, the technology adopts too many assumed values and calculated values in the region where the sigma is determined, the obtained result has larger deviation, and the performance state of the battery pack cannot be accurately determined.

In view of the above, the present invention overcomes the above drawbacks of the prior art and provides a new technical problem to be solved in the art.

Disclosure of Invention

The present invention provides a method and an apparatus for detecting battery pack consistency of an energy storage system, aiming at the above-mentioned defects of the prior art.

The object of the invention can be achieved by the following technical measures:

the invention provides a battery pack consistency detection method for an energy storage system, which comprises the following steps:

in the charging and discharging process of each battery pack, acquiring the voltage deviation value of each battery monomer in the battery pack at each running moment in real time;

comparing the voltage deviation value of each battery monomer at each running time with a first threshold value, and counting the voltage deviation values larger than the first threshold value;

and (ii) obtaining the consistency result of the battery pack and other battery packs in the energy storage system according to the statistical result of the voltage deviation value obtained in the step (i) or the statistical result of the voltage deviation value obtained in the step (ii) and the discharge capacity of the battery pack after leveling adjustment.

Preferably, the obtaining a voltage deviation value of each battery cell in the battery pack at each operation time in real time includes:

acquiring the voltage of each battery monomer in the battery pack at each operation moment, the total voltage of the battery pack and the charging and discharging current in real time;

acquiring the average voltage of all the battery monomers in the battery pack at each running moment in real time;

and calculating the voltage deviation value of each single battery at each running time according to the difference value of the voltage of each single battery at each running time and the average voltage of all the single batteries in the battery pack at the corresponding time.

Preferably, the obtaining the consistency result of the battery pack and other battery packs in the energy storage system according to (i) the obtained voltage deviation value statistics result or (ii) the obtained voltage deviation value statistics result and the discharge capacity of the battery pack after the leveling test comprises:

judging whether the maximum positive voltage deviation value in the charging process and the maximum negative voltage deviation value in the discharging process are from the same battery monomer or not according to the obtained voltage deviation value statistical result;

if so, judging that the battery pack is inconsistent with other battery packs in the energy storage system; if the result is negative, firstly conducting leveling adjustment on the battery pack, then conducting charging and discharging on the battery pack, drawing a charging and discharging curve according to the voltage change of each battery monomer of the battery pack in the charging and discharging process, and calculating the discharging capacity of the battery pack according to the charging and discharging current and time integral of the battery pack in the charging and discharging process;

comparing the obtained discharge capacity with a discharge capacity threshold value, and if the discharge capacity of the battery pack is greater than or equal to the discharge capacity threshold value, the battery pack is consistent with other battery packs in the energy storage system; and if the discharge capacity of the battery pack is smaller than the discharge capacity threshold value, the battery pack does not have consistency with other battery packs in the energy storage system.

Preferably, the discharge capacity threshold is a battery discharge capacity calculated from an integration of a charge and discharge current with time during charge and discharge of a normal battery used as a reference.

Preferably, the leveling test for the battery pack includes: each battery cell of the battery pack is charged to a first charging voltage or discharged to a first discharging voltage with the same current.

The invention provides a battery pack consistency detection device of an energy storage system in a second aspect, which comprises:

the voltage deviation value calculation module is used for acquiring the voltage deviation value of each battery monomer in each battery pack at each operation moment in real time in the charging and discharging process of each battery pack;

the counting module is used for comparing the voltage deviation value of each battery monomer at each running time with a first threshold value and counting the voltage deviation value greater than the first threshold value;

the discharge capacity calculation module is used for drawing a charge and discharge curve according to the voltage change of each battery monomer of the battery pack in the charge and discharge process and calculating the discharge capacity of the battery pack according to the charge and discharge current and the time integral of the battery pack in the charge and discharge process;

the leveling debugging module is used for conducting leveling debugging on the battery pack;

and the judging module is used for obtaining the consistency result of the battery pack and other battery packs in the energy storage system according to the statistical result of the voltage deviation value obtained in the step (i) or the statistical result of the voltage deviation value obtained in the step (ii) and the discharge capacity of the battery pack after leveling adjustment.

Preferably, the voltage deviation value calculation module includes:

the voltage and current detection unit is used for acquiring the voltage of each battery monomer in the battery pack at each operation moment, the total voltage of the battery pack and the charging and discharging current in real time;

the first calculation unit is used for acquiring the average voltage of all the single batteries in the battery pack at each operation moment in real time, and calculating the voltage deviation value of each single battery at each operation moment according to the difference value between the voltage of each single battery at each operation moment and the average voltage of all the single batteries in the battery pack at the corresponding moment.

Preferably, the leveling module is configured to charge each battery cell of the battery pack to a first charging voltage or discharge each battery cell to a first discharging voltage with the same current.

Preferably, the judging module includes:

the first comparison and judgment unit is used for judging whether the maximum positive voltage deviation value in the charging process and the maximum negative voltage deviation value in the discharging process are from the same battery monomer or not according to the obtained voltage deviation value statistical result, and if the result is positive, judging that the battery pack is inconsistent with other battery packs in the energy storage system; if the result is negative, judging that the consistency result of the battery pack is pending;

the second comparison and judgment unit is used for comparing the discharge capacity of the battery pack with the undetermined consistency result after being processed by the leveling module with the discharge capacity threshold, and if the discharge capacity of the battery pack is greater than or equal to the discharge capacity threshold, the battery pack is consistent with other battery packs in the energy storage system; and if the discharge capacity of the battery pack is smaller than the discharge capacity threshold value, the battery pack does not have consistency with other battery packs in the energy storage system.

Preferably, the discharge capacity calculation module includes:

the charging and discharging curve drawing unit is used for drawing a charging and discharging curve according to the voltage change of each battery monomer of the battery pack in the charging and discharging process;

and the second calculating unit is used for calculating the discharge capacity of the battery pack according to the charge-discharge current and the time integral of the battery pack in the charge-discharge process.

The consistency detection method of the battery pack of the energy storage system judges the consistency of the battery pack according to the statistical result of the voltage deviation value of the battery monomer in the battery pack or the statistical result of the voltage deviation value and the discharge capacity of the battery pack, can directly find out the battery monomer with the problem while carrying out consistency detection, and can know the performance state of the battery pack.

Drawings

FIG. 1 is a flow chart of a detection method according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a calculation of a voltage deviation value according to a preferred embodiment of the detecting method of the present invention.

Fig. 3 is a flowchart of consistency result determination in the preferred embodiment of the detection method according to the embodiment of the present invention.

Fig. 4 is a block diagram of a detection apparatus according to an embodiment of the present invention.

Fig. 5 is a block diagram of a preferred embodiment of the detection device of the embodiment of the present invention.

Fig. 6 is a graph showing the charging and discharging of a normal battery pack in the detection method according to the embodiment of the present invention.

Fig. 7 is an exemplary view of an abnormal battery charge and discharge curve in the detection method according to the embodiment of the present invention.

Fig. 8 is an exemplary view of an abnormal battery charge and discharge curve in the detection method according to the embodiment of the present invention.

Fig. 9 is an exemplary view of an abnormal battery charge and discharge curve in the detection method according to the embodiment of the present invention.

Fig. 10 is an exemplary diagram of feature points in the detection method of the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In order to make the description of the present disclosure more complete and complete, the following description is given for illustrative purposes with respect to the embodiments and examples of the present invention; it is not intended to be the only form in which the embodiments of the invention may be practiced or utilized. The embodiments are intended to cover the features of the various embodiments as well as the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and step sequences.

Terms such as "processing," "computing," "calculating," "determining," "establishing," "analyzing," "checking," or the like, may be used in this specification to refer to an operation and/or process of a computer, computing platform, computing system, or other electronic computing device that manipulates and/or transforms data represented as physical (electronic) quantities within the computer's registers and/or memories into other data similarly represented as physical quantities within the computer's registers and/or memories or other information storage medium that may store instructions to perform the operation and/or process.

The battery pack is formed by connecting a plurality of single batteries in series or in series-parallel, in the specification, the single battery refers to a battery string in the battery pack, when the battery pack is charged and discharged, the charging and discharging currents in the battery pack and the single batteries are the same at each operation moment, and the current changes of the battery pack and the single batteries are consistent in the charging and discharging processes.

A first embodiment of the present invention provides a method for detecting battery pack consistency of an energy storage system, please refer to fig. 1, where the method includes:

s1, acquiring voltage deviation values of each battery monomer in each battery pack at each operation time in real time in the charging and discharging process of each battery pack;

s2, comparing the voltage deviation value of each battery cell at each running time with a first threshold value, and counting the voltage deviation values larger than the first threshold value;

and S3, obtaining the consistency result of the battery pack and other battery packs in the energy storage system according to the obtained voltage deviation value statistical result or (ii) the obtained voltage deviation value statistical result and the discharge capacity of the battery pack after leveling adjustment.

Specifically, for each battery pack, numbering is carried out on the battery cells in the battery pack, and the voltage deviation value of each battery cell in the battery pack at each running time is obtained in real time. In a preferred embodiment, please refer to fig. 2, the step S1 may specifically include the following steps:

s101, acquiring the voltage of each battery monomer in the battery pack at each operation moment, the total voltage of the battery pack and the charging and discharging current in real time;

s102, acquiring the average voltage of all the single batteries in the battery pack at each running moment in real time;

and S103, calculating the voltage deviation value of each single battery at each operation time according to the difference between the voltage of each single battery at each operation time and the average voltage of all single batteries in the battery pack at the corresponding time.

In step S2, the step of counting the voltage deviation values greater than the first threshold specifically includes: firstly, the numbers and the corresponding voltage deviation values of the battery cells with the absolute values of the voltage deviation values larger than the first threshold are listed, and then, feature point statistics is performed on the battery cells according to the listed voltage deviation values, wherein the feature points include the maximum positive voltage deviation value in the charging process and the maximum negative voltage deviation value in the discharging process, as shown in fig. 10.

In a preferred embodiment, referring to fig. 3, step S3 specifically includes the following steps:

s301, judging whether the maximum positive voltage deviation value in the charging process and the maximum negative voltage deviation value in the discharging process are from the same battery monomer or not according to the obtained voltage deviation value statistical result;

s302, if the result is positive, the battery pack is judged to be inconsistent with other battery packs in the energy storage system; if the result is negative, charging each battery cell of the battery pack to a first charging voltage or discharging to a first discharging voltage by the same current; charging and discharging the battery pack, drawing a charging and discharging curve according to the voltage change of each battery monomer of the battery pack in the charging and discharging process, and calculating the discharging capacity of the battery pack according to the charging and discharging current and the time integral of the battery pack in the charging and discharging process;

s303, comparing the obtained discharge capacity with a discharge capacity threshold value, wherein if the discharge capacity of the battery pack is greater than or equal to the discharge capacity threshold value, the battery pack is consistent with other battery packs in the energy storage system; and if the discharge capacity of the battery pack is smaller than the discharge capacity threshold value, the battery pack does not have consistency with other battery packs in the energy storage system.

Specifically, if the maximum positive voltage deviation value and the maximum negative voltage deviation value of the discharge process are from the same battery cell, it indicates that the battery cell is damaged. If the maximum positive voltage deviation value and the maximum negative voltage deviation value in the discharging process are from different single batteries, the consistency result of the battery pack needs to be subsequently judged, the consistency result of the battery pack is undetermined, and the final consistency result can be obtained only by judging the discharging capacity of the battery pack.

In a preferred embodiment, in step S303, the discharge capacity threshold is a battery discharge capacity calculated from an integral of a charge and discharge current and time during charge and discharge of a normal battery used as a reference.

In step S302, each battery cell of the battery pack is charged to a first charging voltage or discharged to a first discharging voltage with the same current, that is, for the battery pack with the undetermined consistency result, leveling debugging is performed first, and then the discharging capacity is detected. In step S302, the battery pack after leveling debugging is charged and discharged, a charging and discharging curve graph is drawn according to the voltage change of each battery cell, the discharge capacity of the battery pack is calculated according to the integral of the charging and discharging current and the time in the charging and discharging process, the drawing of the charging and discharging curve and the calculation of the discharge capacity are two independent processes, the drawing of the charging and discharging curve enables the performance change of the battery cells to be more intuitive, and the calculation of the discharge capacity is to further judge the consistency.

The method for detecting the consistency of the battery pack of the energy storage system in the embodiment of the invention judges the consistency of the battery pack according to the statistical result of the voltage deviation value of the battery monomer in the battery pack or the statistical result of the voltage deviation value and the discharge capacity of the battery pack after leveling test, can directly find out the battery monomer with a problem while detecting the consistency, can know the performance state of the battery pack, and is convenient to maintain.

Specifically, in step S3, if the maximum positive voltage deviation value and the maximum negative voltage deviation value of the discharging process are from the same battery cell, and the battery pack does not have consistency, indicating that the battery cell is damaged, the damaged battery cell in the battery pack is replaced; for the battery pack with the undetermined consistency result, leveling debugging can be performed firstly, then the discharge capacity of the battery pack is judged, the discharge capacity is calculated through the current and time integral of the battery pack in the charging and discharging process, meanwhile, the performance states of the battery packs can be known according to the charging and discharging curve of the battery pack, the battery pack with a normal consistency result is used as a standard battery pack for reference, a normal battery pack charging and discharging curve shown in fig. 6 is drawn, the normal battery pack charging and discharging curve is used as a reference standard, the discharge capacity threshold value is also calculated through the current and time integral of the normal battery pack in the charging and discharging process, and for the battery pack with the discharge capacity smaller than the discharge capacity threshold value, the battery pack is judged to be inconsistent, and a battery monomer in; for the battery pack after leveling adjustment, the performance status can also be known through the charging and discharging curve, for example, comparing with the normal battery pack charging and discharging curve shown in fig. 6, it can be seen that the performance status of the battery pack corresponds to the charging and discharging curves shown in fig. 7 to 9, fig. 7 shows that the charging voltage of the battery cells is higher and the discharging voltage is lower, fig. 8 shows that the charging voltage of the battery cells is consistent but the discharging voltage is lower, and fig. 9 shows that the charging voltage is higher and the discharging voltage is consistent. And determining the battery pack to have consistency when the discharge capacity is equal to or greater than the discharge capacity threshold.

A second embodiment of the present invention provides a device for detecting battery pack consistency of an energy storage system, as shown in fig. 4, the device includes: the device comprises a voltage deviation value calculation module 10, a statistic module 20, a discharge capacity calculation module 30, a judgment module 40 and a leveling and adjusting module 50, wherein the voltage deviation value calculation module 10 is used for acquiring the voltage deviation value of each battery monomer in each battery pack at each operation moment in real time in the charging and discharging process of each battery pack; the counting module 20 is configured to compare the obtained voltage deviation value of each battery cell at each operation time with a first threshold, and count the voltage deviation value greater than the first threshold; the discharge capacity calculation module 30 is configured to draw a charge-discharge curve according to a voltage change of each battery cell of the battery pack during charge and discharge, and calculate a discharge capacity of the battery pack according to a charge-discharge current and a time integral of the battery pack during charge and discharge; the judging module 40 is configured to obtain a consistency result between the battery pack and other battery packs in the energy storage system according to (i) the obtained statistical result of the voltage deviation value or (ii) the obtained statistical result of the voltage deviation value and the discharge capacity of the battery pack after leveling adjustment.

For example, when the detecting device of the second embodiment of the present invention is in operation, the voltage deviation value calculating module 10 performs step S1, the counting module 20 performs step S2, the determining module 40 performs step S3, and the discharging capacity calculating module 30 is configured to provide the discharging capacity data for the determining module 40.

In a preferred embodiment, please refer to fig. 5, the voltage deviation value calculating module 10 further includes a voltage and current detecting unit 101 and a first calculating unit 102, wherein the voltage and current detecting unit 101 is configured to obtain a voltage of each battery cell in the battery pack at each operation time, a total voltage of the battery pack, and a charging and discharging current in real time; the first calculating unit 102 is configured to obtain average voltages of all the battery cells in the battery pack at each operation time in real time, and calculate a voltage deviation value of each battery cell at each operation time according to a difference between the voltage of each battery cell at each operation time and the average voltage of all the battery cells in the battery pack at a corresponding time.

In a preferred embodiment, referring to fig. 5, the leveling debugging module 50 is used for charging each battery cell of the battery pack to a first charging voltage or discharging each battery cell to a first discharging voltage with the same current. The judging module 40 further includes a first comparing and judging unit 401 and a second comparing and judging unit 402, where the first comparing and judging unit 401 is configured to judge whether the maximum positive voltage deviation value in the charging process and the maximum negative voltage deviation value in the discharging process are from the same battery cell according to the statistical result of the voltage deviation values obtained by the statistical module 20, and if so, judge that the battery pack is inconsistent with other battery packs in the energy storage system; if not, the consistency result of the battery pack is judged to be pending. For the battery pack whose consistency result is to be determined by the first comparison and determination unit 401, maintenance is performed by the leveling debugging module 50, and then the discharge capacity of the battery pack is calculated by the discharge capacity calculation module 30. The discharge capacity calculation module 30 calculates the discharge capacity of the battery pack whose consistency result is to be determined and subjected to leveling adjustment, and sends the result to the second comparison and determination unit 402. The second comparison and judgment unit 402 is configured to compare the discharge capacity of the battery pack with which the consistency result is to be determined with a discharge capacity threshold, and if the discharge capacity of the battery pack is greater than or equal to the discharge capacity threshold, the battery pack has consistency with other battery packs in the energy storage system; and if the discharge capacity of the battery pack is smaller than the discharge capacity threshold value, the battery pack does not have consistency with other battery packs in the energy storage system.

In a preferred embodiment, please refer to fig. 5, the discharge capacity calculating module 30 further includes a charge-discharge curve drawing unit 301 and a second calculating unit 302, wherein the charge-discharge curve drawing unit 301 is configured to draw a charge-discharge curve according to a voltage variation of each battery cell of the battery pack during the charge-discharge process; the second calculating unit 302 is used for calculating the discharge capacity of the battery pack according to the charge and discharge current and the time integral of the battery pack in the charge and discharge processes.

In the present specification, the description of the device-type embodiment is relatively simple because it is basically similar to the method embodiment, and the relevant points may be referred to the partial description of the method embodiment.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (8)

1. A battery pack consistency detection method for an energy storage system is characterized by comprising the following steps:
in the charging and discharging process of each battery pack, acquiring the voltage deviation value of each battery monomer in the battery pack at each running moment in real time;
comparing the voltage deviation value of each battery monomer at each running time with a first threshold value, and counting the voltage deviation values larger than the first threshold value;
judging whether the maximum positive voltage deviation value in the charging process and the maximum negative voltage deviation value in the discharging process are from the same battery monomer or not according to the obtained voltage deviation value statistical result;
if so, judging that the battery pack is inconsistent with other battery packs in the energy storage system; if the result is negative, firstly conducting leveling adjustment on the battery pack, then conducting charging and discharging on the battery pack, drawing a charging and discharging curve according to the voltage change of each battery monomer of the battery pack in the charging and discharging process, and calculating the discharging capacity of the battery pack according to the charging and discharging current and time integral of the battery pack in the charging and discharging process;
comparing the obtained discharge capacity with a discharge capacity threshold value, and if the discharge capacity of the battery pack is greater than or equal to the discharge capacity threshold value, the battery pack is consistent with other battery packs in the energy storage system; and if the discharge capacity of the battery pack is smaller than the discharge capacity threshold value, the battery pack does not have consistency with other battery packs in the energy storage system.
2. The method for detecting the battery pack consistency of the energy storage system according to claim 1, wherein the step of obtaining the voltage deviation value of each battery cell in the battery pack at each operation time in real time comprises the following steps:
acquiring the voltage of each battery monomer in the battery pack at each operation moment, the total voltage of the battery pack and the charging and discharging current in real time;
acquiring the average voltage of all the battery monomers in the battery pack at each running moment in real time;
and calculating the voltage deviation value of each single battery at each running time according to the difference value of the voltage of each single battery at each running time and the average voltage of all the single batteries in the battery pack at the corresponding time.
3. The method according to claim 1, wherein the discharge capacity threshold is a battery discharge capacity calculated from a charge and discharge current and a time integral of a normal battery used as a reference during charge and discharge.
4. The method for detecting battery pack consistency of the energy storage system according to claim 1, wherein the conducting leveling test on the battery pack comprises: each battery cell of the battery pack is charged to a first charging voltage or discharged to a first discharging voltage with the same current.
5. An energy storage system battery pack consistency detection device, the detection device comprising:
the voltage deviation value calculation module is used for acquiring the voltage deviation value of each battery monomer in each battery pack at each operation moment in real time in the charging and discharging process of each battery pack;
the counting module is used for comparing the voltage deviation value of each battery monomer at each running time with a first threshold value and counting the voltage deviation value greater than the first threshold value;
the discharge capacity calculation module is used for drawing a charge and discharge curve according to the voltage change of each battery monomer of the battery pack in the charge and discharge process and calculating the discharge capacity of the battery pack according to the charge and discharge current and the time integral of the battery pack in the charge and discharge process;
the leveling debugging module is used for conducting leveling debugging on the battery pack;
the judging module is used for obtaining a consistency result of the battery pack and other battery packs in the energy storage system according to the voltage deviation value statistical result obtained in the step (i) or the voltage deviation value statistical result obtained in the step (ii) and the discharge capacity of the battery pack after leveling adjustment;
wherein, the judging module comprises: the first comparison and judgment unit is used for judging whether the maximum positive voltage deviation value in the charging process and the maximum negative voltage deviation value in the discharging process are from the same battery monomer or not according to the obtained voltage deviation value statistical result, and if the result is positive, judging that the battery pack is inconsistent with other battery packs in the energy storage system; if the result is negative, judging that the consistency result of the battery pack is pending;
the second comparison and judgment unit is used for comparing the discharge capacity of the battery pack with the undetermined consistency result after being processed by the leveling module with the discharge capacity threshold, and if the discharge capacity of the battery pack is greater than or equal to the discharge capacity threshold, the battery pack is consistent with other battery packs in the energy storage system; and if the discharge capacity of the battery pack is smaller than the discharge capacity threshold value, the battery pack does not have consistency with other battery packs in the energy storage system.
6. The device for detecting the consistency of battery packs of an energy storage system according to claim 5, wherein the voltage deviation value calculating module comprises:
the voltage and current detection unit is used for acquiring the voltage of each battery monomer in the battery pack at each operation moment, the total voltage of the battery pack and the charging and discharging current in real time;
the first calculation unit is used for acquiring the average voltage of all the single batteries in the battery pack at each operation moment in real time, and calculating the voltage deviation value of each single battery at each operation moment according to the difference value between the voltage of each single battery at each operation moment and the average voltage of all the single batteries in the battery pack at the corresponding moment.
7. The apparatus according to claim 5, wherein the leveling module is configured to charge each cell of the battery pack to a first charging voltage or discharge each cell to a first discharging voltage with the same current.
8. The device for detecting the consistency of the battery packs of the energy storage system as claimed in claim 5, wherein the discharge capacity calculating module comprises:
the charging and discharging curve drawing unit is used for drawing a charging and discharging curve according to the voltage change of each battery monomer of the battery pack in the charging and discharging process;
and the second calculating unit is used for calculating the discharge capacity of the battery pack according to the charge-discharge current and the time integral of the battery pack in the charge-discharge process.
CN201711223175.9A 2017-11-29 2017-11-29 Battery pack consistency detection method and detection device for energy storage system CN108089133B (en)

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