CN109037567B - Battery system - Google Patents
Battery system Download PDFInfo
- Publication number
- CN109037567B CN109037567B CN201810748779.3A CN201810748779A CN109037567B CN 109037567 B CN109037567 B CN 109037567B CN 201810748779 A CN201810748779 A CN 201810748779A CN 109037567 B CN109037567 B CN 109037567B
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- Prior art keywords
- battery
- parallel
- ammeter
- single batteries
- packs
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- 238000005259 measurement Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a battery system, which comprises one or more battery parallel structures and an ammeter; each battery parallel structure at least comprises two parallel single batteries or battery packs, one battery parallel structure is connected at two ends of a load or a charger, a plurality of battery parallel structures are connected at two ends of the load or the charger after being connected in series, the ammeter is connected with the homopolar electrodes of the two parallel single batteries or the battery packs, and each battery parallel structure is connected with one or two ammeters; and judging the consistency of the two single batteries or the battery packs in the battery parallel structure according to the readings of the ammeter. The battery system can detect the consistency of the single batteries or the battery packs in the battery parallel structure on line, position the inconsistent parallel single batteries or the battery packs in the battery system, obtain the inconsistent degree of the parallel single batteries or the battery packs, and does not influence a main loop or change the topological structure of the battery system.
Description
Technical Field
The present invention relates to the field of batteries, and more particularly, to a battery system.
Background
When the lithium ion battery is applied to the field of new energy sources such as electric automobiles and energy storage power stations, the batteries are required to be connected in series and in parallel in order to achieve the required voltage and capacity, and the consistency of the batteries connected in parallel influences the performance and the safety and reliability of the battery pack formed by the batteries to a great extent. Therefore, there is a need to monitor the consistency of the parallel batteries to ensure the performance and safety reliability of the battery system.
In the prior art, the voltage of each parallel structure (formed by connecting single batteries in parallel) of the battery pack is measured, and the consistency of the parallel batteries is estimated based on the voltage. However, the method can only obtain the consistency of the characterization parallel structures, but can hardly characterize the consistency of the single batteries in the parallel structures. The determination of the uniformity of the cells within the parallel structure can usually only be done by dismantling or measuring the current of each cell for the parallel structure. The parallel structure is disassembled and tested, and the on-line measurement cannot be performed; the current of each single battery is measured, and measurement and other auxiliary devices are added in a current main loop, so that the loss of the main loop is increased, the reliability is reduced, and the volume and the cost of the battery pack are greatly increased.
Disclosure of Invention
In view of this, the invention provides a battery system, which can detect the consistency of the single batteries or the battery packs in the parallel structure on line, and is used for solving the problems that the consistency of the single batteries in the parallel structure cannot be detected on line or the circuit is complex, more components are needed, and the loss is large in the prior art.
The present invention provides a battery system including: a battery system, comprising: one or more battery parallel structures and an ammeter;
each battery parallel structure at least comprises two parallel single batteries or battery packs, one battery parallel structure is connected at two ends of a load or a charger, a plurality of battery parallel structures are connected at two ends of the load or the charger after being connected in series, the ammeter is connected with the homopolar electrodes of the two parallel single batteries or the battery packs, and each battery parallel structure is connected with one or two ammeters;
and judging the consistency of the two single batteries or the battery packs in the battery parallel structure according to the readings of the ammeter.
Optionally, when the reading of the ammeter is zero, it is judged that two single batteries or battery packs in the battery parallel structure are consistent, and when the reading of the ammeter is not zero, it is judged that two single batteries or battery packs in the battery parallel structure are inconsistent, and the larger the reading of the ammeter is, the higher the inconsistent degree of the two single batteries or battery packs in the battery parallel structure is indicated.
Optionally, two adjacent series-connected cell parallel structures share an ammeter, and the ammeter is connected to a common end of the two adjacent series-connected cell parallel structures.
Optionally, when the reading of the ammeter is zero, it is judged that two single batteries or battery groups in two adjacent battery parallel structures are consistent, and when the reading of the ammeter is not zero, it is judged that at least two single batteries or battery groups in one battery parallel structure are inconsistent.
Optionally, the battery parallel structure is connected with two ampere meters, and the two ampere meters are respectively connected with the same polarity electrodes of the two parallel single batteries or the battery pack.
Optionally, when one of the readings of the two ampere meters is zero, it is judged that two single batteries or battery packs in the battery parallel structure are identical.
Optionally, the single battery is a single battery or series connection of multiple batteries, and the battery pack is a parallel connection of the single batteries.
Optionally, the battery system comprises three battery parallel structures and two ampere meters,
each battery parallel structure at least comprises two parallel single batteries or battery packs, the three battery parallel structures are connected in series and then connected to two ends of a load or a charger, the ammeter is connected to the homopolar electrodes of the two parallel single batteries or battery packs, and two adjacent battery parallel structures connected in series share one ammeter;
when the readings of the two ampere meters are zero, judging that two single batteries or battery groups in the three battery parallel connection structures are consistent;
when one of the readings of the two ammeter is zero, judging that two single batteries or battery packs in two battery parallel structures connected by the ammeter with the zero reading are consistent, and the two single batteries or battery packs in the other battery parallel structure are inconsistent;
when the readings of the two ampere meters are not zero and the values are opposite, judging that two single batteries or battery packs in the parallel structure connected with the two ampere meters are inconsistent, and the two single batteries or battery packs in the other two battery parallel structures are consistent.
Optionally, the battery system comprises one or more battery parallel structures and an ammeter,
each battery parallel structure comprises N parallel single batteries or battery packs, one battery parallel structure is connected at two ends of a load or a charger, and a plurality of battery parallel structures are connected at two ends of the load or the charger after being connected in series;
the ammeter is respectively connected with the homopolar electrodes of two adjacent parallel single batteries or battery packs, and each battery parallel structure is connected with one or two ammeters or is not connected with the ammeters;
and judging the consistency of the single batteries or the battery packs in the battery parallel structure according to the readings of the ammeter.
Optionally, when the readings of the ammeter are zero, judging that the single batteries or the battery packs in the battery parallel structure are consistent; when the reading of the ammeter is not zero, judging that two single batteries or battery packs connected with the ammeter with the reading being not zero are inconsistent in the battery parallel structure, wherein the larger the reading of the ammeter is, the higher the degree of the inconsistency of the two single batteries or the battery packs connected with the ammeter with the reading being not zero is.
Compared with the prior art, the technical scheme of the invention has the following advantages: according to the invention, like electrodes of two adjacent parallel single batteries or battery packs in the parallel structure are connected with the ammeter, and the consistency of the two adjacent parallel single batteries or battery packs is judged through the reading of the ammeter, so that the method is not only suitable for the case that the parallel structure has two parallel single batteries or battery packs, but also can be expanded to the case that the parallel structure has N parallel single batteries or battery packs. The battery system can detect the consistency of the single batteries or the battery packs in the battery parallel structure on line, can position the inconsistent parallel single batteries or the battery packs in the battery system, obtain the inconsistent degree of the parallel single batteries or the battery packs, does not influence a main loop (a measuring device or other devices are not added in a trunk current loop), and does not change the topological structure of the battery system.
Drawings
Fig. 1 is a schematic view of a battery system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the battery system according to the present invention;
fig. 3 is a schematic structural view of a third embodiment of the battery system of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention.
In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a simplified form and are not to scale precisely, but rather are merely intended to facilitate and clearly illustrate the embodiments of the present invention.
A battery system includes: one or more cells connected in parallel and an ammeter. Each battery parallel structure at least comprises two parallel single batteries or battery packs, one battery parallel structure is connected at two ends of a load or a charger, a plurality of battery parallel structures are connected at two ends of the load or the charger after being connected in series, the ammeter is connected with the homopolar electrodes of the two parallel single batteries or the battery packs, and each battery parallel structure is connected with one or two ammeters;
and judging the consistency of the two single batteries or the battery packs in the battery parallel structure according to the readings of the ammeter.
When the reading of the ammeter is zero, judging that two single batteries or battery packs in the battery parallel structure are consistent, and when the reading of the ammeter is not zero, judging that the two single batteries or battery packs in the battery parallel structure are inconsistent, wherein the larger the reading of the ammeter is, the higher the inconsistent degree of the two single batteries or battery packs in the battery parallel structure is.
The two adjacent series-connected battery parallel structures share one ammeter, and the ammeter is connected to the common end of the two adjacent series-connected battery parallel structures. When the reading of the ammeter is zero, two single batteries or battery packs in two adjacent battery parallel structures are judged to be consistent, and when the reading of the ammeter is not zero, at least two single batteries or battery packs in one battery parallel structure are judged to be inconsistent.
The battery parallel structure is connected with two ampere meters, and the two ampere meters are respectively connected with the same-polarity electrodes of the two parallel single batteries or the battery pack. When one of the readings of the two ampere meters is zero, judging that two single batteries or battery packs in the battery parallel structure are consistent.
The single battery is one battery or a plurality of batteries are connected in series, and the battery pack is the parallel connection of the single batteries.
As shown in fig. 1, a schematic structural diagram of an embodiment of a battery system is provided, where the battery system in fig. 1 includes 3 parallel battery structures, and each parallel battery structure includes 2 parallel unit cells. L is a load or a charger, and the 3 parallel units are connected in series and then connected in the connecting section of L. The parallel single battery comprises 2 batteries. A1 and A2 are ampere meters, wherein the ampere meters A1 and A2 are respectively connected with the common end of two adjacent series battery parallel structures, and are used for measuring currents of corresponding paths.
According to the readings of A1 and A2, the consistency and the degree of inconsistency of the two corresponding parallel single batteries can be respectively judged, and meanwhile, the positions of the inconsistent parallel single batteries can be positioned.
In the dynamic case (on-line), i.e. when the total battery current is non-zero, several characteristic states are listed below:
a1 =0, a2=0, the parallel single cells n-1 and n-2 are identical, n=1, 2,3;
a1 is not equal to 0, a2=0, the parallel single batteries 1-1 and 1-2 are not consistent, the parallel single batteries n-1 and n-2 are consistent, and n=2, 3;
a1 is not equal to 0, a2 is not equal to 0, a1= -A2, the parallel single batteries 2-1 and 2-2 are not consistent, the parallel single batteries n-1 and n-2 are consistent, and n=1, 3;
a1 =0, a2+.0, parallel cells 3-1 and 3-2 are not identical, parallel cells n-1 and n-2 are identical, n=1, 2.
The larger the readings of the ammeter, the higher the degree of inconsistency between two parallel single batteries adjacent to the ammeter. The inconsistency of the parallel unit cells is related to |a1| and |a2|, and the correspondence thereof is related to the total current and temperature of the battery pack. In addition to the above states, other states need to be analyzed according to specific situations to determine the inconsistent states and positions of the parallel single batteries, and the threshold range of the judgment point needs to be determined by actual measurement.
When a plurality of single batteries are connected in parallel in the battery parallel structure, the current can be measured at half points according to actual conditions, and the point positions of the measured current can be increased to improve the positioning accuracy.
As shown in fig. 2, the parallel single batteries n-1 and n-2 form a parallel battery pack 1, the parallel single batteries n-3 and n-4 form a battery pack 2, and the parallel single batteries comprise the parallel battery pack 1 and the parallel battery pack 2. In this way, the consistency of the battery pack 1 and the parallel battery pack 2 is judged by the ammeter An, an-1, so that the number of the ammeters can be reduced.
The ammeter can be added between the parallel single batteries n-1 and n-2 for improving the precision, and the ammeter can be added between the parallel single batteries n-3 and n-4, and the consistency and the inconsistency degree of two adjacent parallel single batteries can be judged according to the readings of the ammeter, so that the consistency of the parallel single batteries n-1, n-2, n-3 and n-4 can be obtained.
Therefore, the situation that the battery parallel structure comprises N single batteries or battery packs which are connected in parallel can be detected. Each parallel single battery or battery pack is at least connected with one ammeter, so that the consistency of all two adjacent parallel single batteries or battery packs can be obtained. The number of the ampere meters can be increased or decreased according to the requirement, so that each parallel battery or battery pack cannot be detected.
The battery system comprises one or more battery parallel structures and an ammeter, wherein each battery parallel structure comprises N parallel single batteries or battery packs, one battery parallel structure is connected to two ends of a load or a charger, and a plurality of battery parallel structures are connected in series and then connected to two ends of the load or the charger;
the ammeter is respectively connected with the homopolar electrodes of two adjacent parallel single batteries or battery packs, and each battery parallel structure is connected with one or two ammeters or is not connected with the ammeters;
and judging the consistency of the single batteries or the battery packs in the battery parallel structure according to the readings of the ammeter.
When the readings of the ammeter are zero, judging that the single batteries or the battery packs in the battery parallel structure are consistent; when the reading of the ammeter is not zero, judging that two single batteries or battery packs connected with the ammeter with the reading not zero in the battery parallel structure are inconsistent; the greater the ammeter reading, the greater the degree of inconsistency between two cells or battery packs connected to an ammeter with a reading other than zero
In the battery pack with a larger number of series connection, according to practical situations, each two parallel single battery units share one measuring current point, so that the number of ampere meters is reduced, as shown in fig. 3. An ammeter is commonly used for every two parallel single batteries, and only one battery meter is used for each parallel single battery. When the reading of the ammeter is zero, two single batteries or battery packs in two adjacent battery parallel structures are judged to be consistent, and when the reading of the ammeter is not zero, at least two single batteries or battery packs in one battery parallel structure are judged to be inconsistent.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (7)
1. A battery system, comprising: one or more battery parallel structures and an ammeter;
each battery parallel structure at least comprises two parallel single batteries or battery packs, one battery parallel structure is connected at two ends of a load or a charger, a plurality of battery parallel structures are connected at two ends of the load or the charger after being connected in series, the ammeter is connected with the homopolar electrodes of the two parallel single batteries or the battery packs, and each battery parallel structure is connected with one or two ammeters;
judging the consistency of two single batteries or battery packs in the battery parallel structure according to the readings of the ammeter;
when the reading of the ammeter is zero, judging that two single batteries or battery packs in the battery parallel structure are consistent, and when the reading of the ammeter is not zero, judging that the two single batteries or battery packs in the battery parallel structure are inconsistent, wherein the larger the reading of the ammeter is, the higher the inconsistent degree of the two single batteries or battery packs in the battery parallel structure is;
the two adjacent series-connected battery parallel structures share an ammeter, and the ammeter is connected to the common end of the two adjacent series-connected battery parallel structures;
the single battery is one battery or a plurality of batteries are connected in series, and the battery pack is the parallel connection of the single batteries.
2. The battery system according to claim 1, wherein: when the reading of the ammeter is zero, two single batteries or battery packs in two adjacent battery parallel structures are judged to be consistent, and when the reading of the ammeter is not zero, at least two single batteries or battery packs in one battery parallel structure are judged to be inconsistent.
3. The battery system according to claim 1, wherein: the battery parallel structure is connected with two ampere meters, and the two ampere meters are respectively connected with the same-polarity electrodes of the two parallel single batteries or the battery pack.
4. The battery system according to claim 3, wherein: when one of the readings of the two ampere meters is zero, judging that two single batteries or battery packs in the battery parallel structure are consistent.
5. The battery system according to claim 1, wherein: the battery system comprises three battery parallel structures and two ampere meters,
each battery parallel structure at least comprises two parallel single batteries or battery packs, the three battery parallel structures are connected in series and then connected to two ends of a load or a charger, the ammeter is connected to the homopolar electrodes of the two parallel single batteries or battery packs, and two adjacent battery parallel structures connected in series share one ammeter;
when the readings of the two ampere meters are zero, judging that two single batteries or battery groups in the three battery parallel connection structures are consistent;
when one of the readings of the two ammeter is zero, judging that two single batteries or battery packs in two battery parallel structures connected by the ammeter with the zero reading are consistent, and the two single batteries or battery packs in the other battery parallel structure are inconsistent;
when the readings of the two ampere meters are not zero and the values are opposite, judging that two single batteries or battery packs in the parallel structure connected with the two ampere meters are inconsistent, and the two single batteries or battery packs in the other two battery parallel structures are consistent.
6. The battery system according to claim 1, wherein: the battery system includes one or more battery parallel structures and an ammeter,
each battery parallel structure comprises N parallel single batteries or battery packs, one battery parallel structure is connected at two ends of a load or a charger, and a plurality of battery parallel structures are connected at two ends of the load or the charger after being connected in series;
the ammeter is respectively connected with the homopolar electrodes of two adjacent parallel single batteries or battery packs, and each battery parallel structure is connected with one or two ammeters or is not connected with the ammeters;
and judging the consistency of the single batteries or the battery packs in the battery parallel structure according to the readings of the ammeter.
7. The battery system according to claim 6, wherein: when the readings of the ammeter are zero, judging that the single batteries or the battery packs in the battery parallel structure are consistent; when the reading of the ammeter is not zero, judging that two single batteries or battery packs connected with the ammeter with the reading not zero in the battery parallel structure are inconsistent; the larger the ammeter reading, the higher the degree of inconsistency of two cells or battery packs connected to the ammeter with a reading other than zero.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810748779.3A CN109037567B (en) | 2018-07-09 | 2018-07-09 | Battery system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810748779.3A CN109037567B (en) | 2018-07-09 | 2018-07-09 | Battery system |
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| CN109037567A CN109037567A (en) | 2018-12-18 |
| CN109037567B true CN109037567B (en) | 2024-02-02 |
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| CN115642322A (en) * | 2022-11-07 | 2023-01-24 | 国网吉林省电力有限公司电力科学研究院 | Lithium battery energy storage system and fault detection method |
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2018
- 2018-07-09 CN CN201810748779.3A patent/CN109037567B/en active Active
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| CN102683764A (en) * | 2012-05-17 | 2012-09-19 | 陈春飞 | Paralleling charge method and paralleling device of battery unit |
| CN104485474A (en) * | 2014-12-04 | 2015-04-01 | 上海交通大学 | Electric vehicle battery pack matching method based on coincidence indicator |
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