AU2017100660A4 - Rapid failure detection method of parallel single batteries in a serial-parallel battery pack - Google Patents
Rapid failure detection method of parallel single batteries in a serial-parallel battery pack Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
Abstract The invention relates to a rapid failure detection method of parallel single batteries in a serial-parallel battery pack, used for the failure detection of the parallel single batteries. According to the detection method, solenoid coils are unidirectionally winded on outer surfaces of the parallel single batteries, the size and the direction of the current in the single batteries are indirectly sampled by using the Faraday law of electromagnetic induction. and then whether the single batteries are invalid is judged based on the sampled size information and the direction information of the current. The detection method is simple, the cost budgeting is lower and the practicability is higher, the size and the direction of the current of each working single battery in the parallel battery pack are monitored, therefore the rapid detection of each single battery in the parallel battery pack is effectively realized, the accuracy and the reliability of the detection are improved, meanwhile the security and the validity of the entire detection are improved, and the ability of predicting the performance of the batteries is also improved. Fig. 1 Solenoid coil Curant infoatim CImcto Batey.ng.n Sol eno id collecting an coil es m e Fig. 2 Solenoid coil ----------------------------------- SoenidInfarnation 1 1 tiP,/ m iai Baty nget coi l sapling module pmesn euecre .eul7odl .Fg 3 i I a-rent infonontid collecting and psing module I Solenoid L-----------__------_------------ Fig. 3 Solenoid coil .. Solenoid _ Oret inforniatimn collecting and processing nodule : coil Fig. 4
Description
Rapid Failure Detection Method of Parallel Single Batteries in a Serial-parallel Battery
Pack
Field of the Invention
The invention relates to the technical field of storage batteries, and particularly relates to a rapid failure detection method of parallel single batteries in a serial-parallel battery pack.
Background of the Invention
With the development of the worldwide vehicle industry, the consumption of oil energy, the atmospheric pollution caused by vehicle emissions and the greenhouse effect of the earth, it becomes a very urgent task in the worldwide automobile industry to develop new-energy vehicles and develop new vehicle power. The existing novel green and environmentally-friendly electric vehicle usually employs lithium ion battery packs as a power source, the application of serially connecting more than ten strings or even hundreds of strings of lithium ion battery packs on the green and environmentally-friendly electric vehicle, and the application prospect is broad. In practical application, lithium batteries often need to be connected in series and parallel for use to form a serial-parallel battery pack so as to satisfy the requirements of voltage and current. At present, the group technology of the batteries is not good enough, the consistency of the batteries is difficult to guarantee, and with the increase of the number of charge and discharge cycles, the difference between the batteries will be larger and larger, resulting in that the battery management system has a lot of problems in the matter of SOC calculation and control strategy, and thus the service life of the battery pack is affected. Usually, a single battery having great consistency difference with other single batteries in the power battery pack is called a failure battery, and if the failure battery can be found out or predicted in advance, it is very beneficial for the use and management of the po wer battery pack. However, as the inherent parameters of the batteries are difficult to measure, there is no effective method to process the failure battery at present, the existing failure detection methods mainly include internal resistance measurement, charge and discharge capacity measurement and other methods, the above-mentioned measurement methods have respective limitations, such as practicality, effectiveness, convenience and the like, and the accuracy and efficiency of failure detection cannot be well solved by the above-mentioned methods; furthermore, a battery group solution of primary parallel connection and secondary serial connection is usually adopted in the power battery pack, the single voltage monitored by the battery management system at present is merely a total voltage after a group is formed by parallel connection, and the real volume change of each single battery and the performance change of each single battery in the power battery' pack after the group is formed by parallel connection cannot be monitored.
Summary of the Invention
The present invention provides a rapid failure detection method of a parallel single battery in a serial-parallel battery pack in view of the problems of complex detection structure, complex operations, worse practicability, worse detection accuracy and detection efficiency and incapability of detecting the states of single batteries in a power battery pack. Solenoid coils are unidirectionally winded on outer surfaces of the parallel single batteries, the size and direction of current in the single batteries are indirectly sampled by the Faraday law of electromagnetic induction so as to judge whether the single batteries are invalid, the detection method is simple, so the cost budgeting is reduced, the practicability is higher, the rapid failure detection of the parallel single batteries in the power battery pack is realized, and meanw'hile the accuracy and the reliability of detection are improved.
The technical solutions of the present invention are as follows: A rapid failure detection method of parallel single batteries in a serial-parallel battery pack is used for the failure detection of the parallel single batteries, wherein the method includes: unidirectionally winding solenoid coils on outer surfaces of the parallel single batteries, establishing a relationship calculation model of induced electromotive forces in the solenoid coils and the current in the single batteries by using the Faraday law of electromagnetic induction, sampling the size and the direction of the current in the single batteries according to a calculation result of the relationship calculation model, and detecting the capacity changes mid the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid.
The detecting the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries tire invalid specifically refers to: comparing whether the size change and the direction change of the current of the existing single battery are consistent with those of other single batteries in a charge and discharge process, and combining tire capacity change of die existing single battery caused by the compared size change of the current with the performance change of the existing single battery caused by the compared direction change of the current to judge whether the existing single battery is invalid.
Preprocessing is performed on the current after the size and the direction of the current in the single batteries are sampled, and then the capacity changes and the performance changes of the single batteries are detected based on the size and the direction of the preprocessed current to judge whether the single batteries are invalid.
The size information and the direction information of the current are transmitted to a battery management module after the size and the direction of the current in the single batteries are sampled, and the battery management module detects the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid, and monitors and reports battery states in real time.
After the current is preprocessed, the size information and the direction information of the preprocessed current are output to the battery management module, and the battery management module detects the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid, and monitors and reports the battery states in real time.
The preprocessing of the current includes: de-noising processing, and/or, A/D conversion processing. A rapid failure detection device of parallel single batteries in a serial-parallel battery pack is used for the failure detection of the parallel single batteries, wherein the device includes: a plurality of solenoid coils, the device further includes a current information collecting and processing module, a communication module and a battery management module, which are connected in sequence, the solenoid coils are unidirectionally winded on outer surfaces of tire parallel single batteries correspondingly and respectively, the solenoid coils are connected with the current information collecting and processing module, the current information collecting and processing module establishes a relationship calculation model of induced electromotive forces in the solenoid coils and the current in the single batteries by using the Faraday law of electromagnetic induction, and samples the size and the direction of the current in the single batteries according to a calculation result of the relationship calculation model, the communication module is used for realizing communication and data transmission between the current information collecting and processing module and the battery management module, and the battery management module detects the capacity changes and the performance changes of the single batteries based on the size and the direction of the current transmitted by the communication module to judge whether the single batteries are invalid.
The battery management module further monitors and reports battery states in real time; and/or, the battery management module compares whether the size change and the direction change of the current of the existing single battery are consistent with those of other single batteries in a charge and discharge process, and combines the capacity change of the existing single battery caused by the compared size change of the current with the performance change of the existing single battery' caused by the compared direction change of the current to judge w'hether the existing single battery is invalid.
The current information collecting and processing module includes an information sampling module, a relationship model calculation processing module and an A/D converter, which are connected in sequence, the information sampling module is connected with the solenoid coils, the A/D converter is connected with the communication module, the information sampling module collects induced electromotive force information of the solenoid coils, the relationship model calculation processing module establishes the relationship calculation model of the induced electromotive forces in the solenoid coils and the current in the single batteries by using the Faraday law of electromagnetic induction, and samples the size and the direction of the current in the single batteries according to the calculation result of the relationship calculation model, and the A/D converter performs analog-to-digital conversion on the sampled size data and direction data of the current.
The current information collecting and processing module further includes a de-noising processing module, the de-noising processing module is arranged between the relationship model calculation processing module and the A/D converter, the de-noising processing module performs de-noising processing on the sampled size data and the direction data of the current and transmits the same to the A/D converter, and the A/D converter performs the analog-to-digital conversion on the size data and the direction data of the current after the de-noising processing.
The technical effects of the present invention are as follows:
According to the rapid failure detection method of the parallel single batteries in the serial-parallel battery pack, tire solenoid coils are unidirectionally winded on the outer surfaces of the parallel single batteries, the relationship calculation model of the induced electromotive forces in the solenoid coils and the current in the single batteries is established by using the Faraday law of electromagnetic induction, the size and the direction of the current in the single batteries tire sampled according to the calculation result of the relationship calculation model, that is, indirect sampling of the size and the direction of the current in the single batteries is realized, and then whether the single batteries are invalid is judged based on the sampled size and the direction of the current. The detection method is simple, so the cost budgeting is reduced, the practicability is higher, the efficient and fast detection of failure batteries in the parallel single batteries in the power battery pack is realized, and meanwhile the accuracy and the reliability of the detection are improved. According to the present invention, the current value and the direction thereof of each battery in the parallel battery pack are monitored by smartly winding the solenoid coils on each single battery, in this case, the size and the direction of the current of each working single battery in the parallel battery pack can be monitored, the rapid detection of each single battery in the parallel battery pack is effectively realized, the security and tire validity of the entire detection are improved, and the ability of predicting the performance of the batteries is also improved.
The invention further relates to a rapid failure detection device of parallel single batteries in a serial-parallel battery pack, including a plurality of solenoid coils, wherein the device further includes a current information collecting and processing module, a communication module and a battery management module, which are connected in sequence, and the current information collecting and processing module is further connected with the plurality of solenoid coils. The rapid failure detection device involved in the present invention corresponds to the above-mentioned rapid failure detection method of the parallel single batteries in the serial-parallel battery pack and can be understood as a rapid failure detection device used for realizing the rapid failure detection method of the parallel single batteries in the serial-parallel battery pack provided by the present invention, the rapid failure detection device is simple in structure and high in practicability, and is able to realize efficient, rapid and accurate failure detection of the parallel single batteries and improve the security and the validity of the entire detection and the ability of predicting the performance of the batteries, thereby being suitable for the promotion and use in tire detection of power battery packs of novel green and environmentally-friendly electric vehicles.
Brief Description of the Drawings
Fig. 1 is a structural schematic diagram of an application of a rapid failure detection method or device of parallel single batteries in a serial-parallel battery pack involved in the present invention.
Fig. 2 is a structural schematic diagram of a rapid failure detection device of parallel single batteries in a serial-parallel battery pack of the present invention.
Fig. 3 is a schematic diagram of a preferred structure of a rapid failure detection device of parallel single batteries in a serial-parallel battery pack of the present invention.
Fig. 4 is a schematic diagram of another preferred structure of a rapid failure detection device of parallel single batteries in a serial-parallel battery pack of the present invention.
Reference signs are shown in the drawings as follows: 1-parallel single batteries; 2-solenoid coils.
Detailed Description of the Invention
The invention will be illustrated below in combination with the accompanying drawings.
The present invention discloses a rapid failure detection method of parallel single batteries in a serial-parallel battery pack, used for the failure detection of the parallel single batteries. As shown in Fig. 1, solenoid coils are unidirectionally winded on outer surfaces of the parallel single batteries (i.e., parallel single batteries 1 and can also be called single batteries 1), according to the Faraday law of electromagnetic induction, a changing electric field generates a magnetic field, the changing magnetic field can cause a change on the magnetic flux in the solenoid coils 2 so as to generate induced current, a relationship calculation model of induced electromotive forces in the solenoid coils 2 and the current in the single batteries 1 is firstly established, the size and the direction of the current in the single batteries 1 are sampled according to a calculation result of the relationship calculation model, therefore the indirect sampling of the size and the direction of the current in the single batteries can be realized by using the Faraday law of electromagnetic induction, the capacity changes and the performance changes of the single batteries are detected based on the size and the direction of the current to judge whether the single batteries are invalid, wherein the size of the current depends on the size of the load, and the size of the load is often configured according to actual application demands. The detecting the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid specifically refers to: detecting (or comparing) whether the size change and the direction change of the current of the existing single battery are consistent with those of other single batteries in a charge and discharge process, and combining the capacity change (affecting the performance change of the existing single battery accordingly) of the existing single battery caused by the compared size change of the current with the performance change of the existing single battery caused by the compared direction change of the current to judge whether the existing single battery' is invalid. For example, in the charge and discharge process of the batteries, assuming that the size of the current of other parallel single batteries is 1A, and the size of the current of the existing single battery is 0.5A (or 1.5 A), then the size change of the current of the existing single battery is inconsistent with the size change of the current of the other single batteries in the charge and discharge process, therefore the real capacity of the existing single battery changes, which affects the performance change of the existing single battery, and thus the existing single battery is determined to be a failure battery; and further assuming that the sizes of the current of other parallel single batteries and the existing single battery are all 1A and the current direction of the existing single battery' is opposite to the current direction of the other parallel single batteries in the charge and discharge process, then although the sizes of the current of other parallel single batteries and the sizes of the current of the existing single battery are the same, the directions are different, and the direction change of the current of the existing single battery is inconsistent with the direction change of the current of the other single batteries in the charge and discharge process, therefore the performance of the existing single battery changes, and accordingly the existing single battery is determined to be the failure battery similarly.
Preferably, preprocessing (can be de-noising processing, or A/D conversion processing or a combination of the two) is performed on the current after the size and the direction of the current in the single batteries are sampled indirectly by using the Faraday law of electromagnetic induction, and then the capacity changes and the performance changes of the single batteries are detected based on the size and the direction of the preprocessed current to judge whether the single batteries are invalid.
More preferably, the size information and the direction information of the current are transmitted to a battery management module after the size and the direction of the current in the single batteries are indirectly sampled by using the Faraday law of electromagnetic induction, and the battery management module detects the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid, and can monitor and report the states of the batteries in the serial-parallel battery pack in real time according to actual application demands; or after the preprocessing (can be de-noising processing, and/or A/D conversion processing) is performed on the current, the size information and the direction information of the preprocessed current output to the battery management module, and the battery management module detects the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid, and monitors and reports the battery states in real time.
The principle of indirectly sampling the size of the current in the single batteries by using the Faraday law of electromagnetic induction involved in the present invention is specifically illustrated as follows; in the power battery pack, the consistency of the single batteries is usually difficult to guarantee, with the increase of charge and discharge times, the battery electromotive force, the battery' internal resistance and the battery capacity of the failure battery will change greatly, which may easily cause other single batteries to charge the existing failure battery in the discharge process of the power battery pack as an example, so that the current size and the current direction in the failure battery change.
Referring to Fig. 1. the relationship calculation model of the induced electromotive forces in the solenoid coils 2 and the size of the current in the parallel single batteries 1 established according to the Faraday law of electromagnetic induction is as follows;
The formula (2) is substituted in the formula (1) to obtain the values of the induced electromotive forces E in the solenoid coils, wherein E represents the induced electromotive force values, Φ represents the magnetic flux in the solenoid coils 2, B represents the magnetic induction intensity generated by the parallel single batteries 1 in the solenoid coils 2, and S represents the cross sectional areas of the solenoid coils 2.
Since the magnetic induction intensity B generated by the parallel single batteries 1 is in direct proportion to the current i, the magnetic flux Φ is in direct proportion to the current i, namely:
Wherein, L represents an inductance coefficient.
After formula (3) is substituted in formula (1), it can be seen that the induced electromotive forces E in the solenoid coils 2 are in direct proportion to the change of the current i in the parallel single batteries 1, namely:
It can be seen from formula (4) that for the given solenoid coils 2, since the resistance values are fixed, the sampling the size and the direction of the current in the parallel single batteries 1 according to the calculation result of the relationship calculation model, so it can also be understood the size of the current of the parallel single batteries 1 are indirectly obtained by detecting the size of the induced current in the solenoid coils 2, and thus whether the parallel single batteries 1 are invalid can be further judged.
The invention further relates to a rapid failure detection device of parallel single batteries in a serial-parallel battery pack, used for the failure detection of the parallel single batteries, its structure is as shown in Fig. 2, the device includes a plurality of solenoid coils and further includes a current information collecting and processing module, a communication module and a battery management module, which are connected in sequence, the solenoid coils are unidirectionally winded on outer surfaces of the parallel single batteries correspondingly and respectively, the solenoid coils are connected with the current information collecting and processing module, the current information collecting and processing module establishes a relationship calculation model of induced electromotive forces in the solenoid coils and the current in the single batteries by using the Faraday law of electromagnetic induction, and samples the size and the direction of the current in the single batteries according to a calculation result of the relationship calculation model, the communication module is used for realizing communication and data transmission between the current information collecting and processing module and the battery management module, for example, transmitting a control instruction to the current information collecting and processing module to realize current sampling control and transmit the size information and the direction information of the current sampled by the current information collecting and processing module to the battery management module, and the battery management module detects the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid.
The battery management module can further monitor and report the states of the batteries in the serial-parallel battery pack in real tune according to actual application demands.
Preferably, the battery management module detects the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid in the following manner: comparing whether the size change and the direction change of the current of the existing single battery me consistent with those of other single batteries in a charge and discharge process, and combining the performance change of the existing single battery accordingly caused by the capacity change of the existing single battery caused by the compared size change of the current with the performance change of the existing single battery caused by the compared direction change of the current to judge whether the existing single battery is invalid.
Preferably, the current information collecting and processing module can include an information sampling module, a relationship model calculation processing module and an A/D converter, which are connected in sequence. Fig. 3 shows a preferred structure of the detection device of the present invention, the information sampling module is further connected with the solenoid coils, the A/D converter is further connected with the communication module, the information sampling module collects induced electromotive force information of the solenoid coils, the relationship model calculation processing module establishes the relationship calculation model of the induced electromotive forces in the solenoid coils and the current in the single batteries by using the Faraday law of electromagnetic induction, and samples the size and the direction of the current in the single batteries according to the calculation result of the relationship calculation model, the A/D converter performs analog-to-digital conversion on the sampled size data and direction data of the current, and the data after the analog-to-digital conversion are more beneficial for the data transmission of the communication module.
More preferably, on the basis of Fig. 3, the current information collecting and processing module can further include a de-noising processing module. Fig. 4 shows another preferred structure of the detection device of the present invention, the de-noising processing module is arranged between the relationship model calculation processing module and the A/D converter, the de-noising processing module performs de-noising processing on the sampled size data and the direction data of the current and transmits the same to the A/D converter, and the A/D converter performs the analog-to-digital conversion on the size data and the direction data of the current after the de-noising processing.
It should be noted that the specific embodiments described above may enable those skilled in the ait to understand the present invention more fully, but do not limit the present invention in any way. Accordingly, although the present invention has been described in detail with reference to the accompanying drawings and the embodiments in the present specification, it should be understood by those skilled in the art that modifications or equivalent substitutions can still be made to the present invention. In summary, all the technical solutions and improvements thereof made without departing from the spirit and scope of the present invention shall fall into the protection scope of the patent of the present invention.
Claims (5)
- Claims1. A rapid failure detection method of parallel single batteries in a serial-parallel battery pack, used for failure detection of the parallel single batteries, characterized in that the method comprises: unidirectionally winding solenoid coils on outer surfaces of the parallel single batteries, establishing a relationship calculation model of induced electromotive forces in the solenoid coils and the current in the single batteries by using the Faraday law of electromagnetic induction, sampling the size and the direction of the current in the single batteries according to a calculation result of the relationship calculation model, and detecting the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid.
- 2. The rapid failure detection method of parallel single batteries in a serial-parallel battery pack according to claim 1, characterized in that the detecting the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid specifically refers to: comparing whether the size change and the direction change of the current of the existing single battery are consistent with those of other single batteries in a charge and discharge process, and combining the capacity change of the existing single battery caused by the compared size change of the current with the performance change of the existing single battery caused by the compared direction change of the current to judge whether the existing single battery is invalid.
- 3. The rapid failure detection method of parallel single batteries in a serial-parallel battery pack according to claim 1 or 2, characterized in that preprocessing is performed on the current after the size and the direction of the current in the single batteries are sampled, and then tire capacity changes tind the performance changes of the single batteries are detected based on the size and the direction of the preprocessed current to judge whether the single batteries are invalid.
- 4. The rapid failure detection method of parallel single batteries in a serial-parallel battery pack according to claim 1 or 2, characterized in that the size information and the direction information of the current are transmitted to a battery management module after the size and the direction of the current in the single batteries are sampled, and the battery management module detects the capacity changes and die performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid, and monitors and reports battery states in real time.
- 5. The rapid failure detection method of parallel single batteries in a serial-parallel battery pack according to claim 3, characterized in that the size information and the direction information of the preprocessed current are output to the battery management module after the current is preprocessed, and the battery management module detects the capacity changes and the performance changes of the single batteries based on the size and the direction of the current to judge whether the single batteries are invalid, and monitors and reports the battery states in real time; and the preprocessing of the current comprises: de-noising processing, and/or, A/D conversion processing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610585186.0A CN106291370B (en) | 2016-07-22 | 2016-07-22 | Monomer failure rapid detection method and device in parallel in a kind of series-parallel battery pack |
| CN201610585186.0 | 2016-07-22 |
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| CN109080468B (en) * | 2018-06-27 | 2021-06-01 | 中航锂电（洛阳）有限公司 | Early warning method and system for battery module with overcharge protection device |
| CN113296012B (en) * | 2021-05-20 | 2022-07-15 | 中国科学技术大学 | Lithium battery pack consistency detection method and device based on in-situ magnetic field imaging |
| CN113270657B (en) * | 2021-07-20 | 2021-12-28 | 四川新能源汽车创新中心有限公司 | Battery matrix dead pixel detection system and detection method based on electromagnetic induction effect |
| CN114325435B (en) * | 2021-12-22 | 2023-07-14 | 蜂巢能源科技股份有限公司 | Method and device for detecting failed battery cell and battery system |
| CN115856677A (en) * | 2023-03-03 | 2023-03-28 | 宁德时代新能源科技股份有限公司 | Battery self-discharge detection method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62214420A (en) * | 1986-03-17 | 1987-09-21 | Fujitsu Ltd | System for protecting storage by backup battery |
| JPH04359872A (en) * | 1991-06-07 | 1992-12-14 | Nec Corp | Battery pack |
| US8122193B2 (en) * | 2004-12-21 | 2012-02-21 | Samsung Electronics Co., Ltd. | Storage device and user device including the same |
| JP2012205410A (en) * | 2011-03-25 | 2012-10-22 | Sanyo Electric Co Ltd | Storage battery assembly control system |
| CN204269735U (en) * | 2014-12-23 | 2015-04-15 | 安徽江淮汽车股份有限公司 | A kind of insulation failure detection circuit of electrokinetic cell bag |
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| CN106291370A (en) | 2017-01-04 |
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