CN116699447A - Detection circuit and detection system of battery module - Google Patents
Detection circuit and detection system of battery module Download PDFInfo
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- CN116699447A CN116699447A CN202310683944.2A CN202310683944A CN116699447A CN 116699447 A CN116699447 A CN 116699447A CN 202310683944 A CN202310683944 A CN 202310683944A CN 116699447 A CN116699447 A CN 116699447A
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- 238000001514 detection method Methods 0.000 title claims abstract description 56
- 238000004804 winding Methods 0.000 claims description 57
- 230000005284 excitation Effects 0.000 claims description 29
- 238000013461 design Methods 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000011897 real-time detection Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract description 3
- 238000004146 energy storage Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- HVCNNTAUBZIYCG-UHFFFAOYSA-N ethyl 2-[4-[(6-chloro-1,3-benzothiazol-2-yl)oxy]phenoxy]propanoate Chemical compound C1=CC(OC(C)C(=O)OCC)=CC=C1OC1=NC2=CC=C(Cl)C=C2S1 HVCNNTAUBZIYCG-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
-
- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- 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
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- 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
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
-
- 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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the field of battery module detection, and particularly discloses a detection circuit and a detection system of a battery module; the detection circuit is simple in circuit structure, small in heating during testing, high in precision, convenient to install and simple to detect, small in influence on battery packaging, and convenient for a user to connect a battery to the detection circuit for detection.
Description
Technical Field
The invention belongs to the technical field of battery module detection, and particularly relates to a detection circuit and a detection system of a battery module.
Background
The BMS is a short term of the battery management system, which is a core of the energy storage system, and in order to ensure reliable operation of the energy storage system, it needs to collect relevant data of each single battery and provide predictions of key parameters (SOC, SOH, internal resistance, etc.), and finally, make corresponding policy response through instructions of the EMS system.
BMS for domestic energy storage is taken off child in BMS for electric automobile, and BMS for electric automobile is then taken off child in two technical routes: one is a battery management system (system voltage is 220V or 380V) of an electric operation power supply, the other is a 48V battery management system (system voltage is 48V) for communication, the two technical routes are back-up application, an electric automobile is a dynamic application scene, an energy storage system is quite different from the electric automobile in working scene, the electric automobile is quite different in electricity degree and electricity degree, the energy storage capacity of the electric automobile is usually in a range of 30-200 degrees, the energy storage capacity is several times or even tens or hundreds of times larger, so that the temporary replacement can relieve the problems of some emergency and test points, but the energy storage also essentially needs to develop a special BMS (battery management system) for meeting the requirements of high-precision SOC and internal resistance prediction under different application scenes of energy storage.
At present, a set of BMS system with a set of three-level architecture constructed by voltage and temperature acquisition units (modules) is fully adopted by the BMS for domestic energy storage, and the system has the following problems at present: 1. due to the problems of the group welding process and the PACK volume of the lithium battery, most BMS suppliers do not collect the voltage and the temperature of the single battery cells when providing a solution, but place the collection unit on a bus of a module or at a certain position among a plurality of single battery cells, and the collected data are far from the actual working conditions and states of the single battery cells; 2. the SOC is estimated by an ampere-hour integration method, however, the current of an actual single cell adopts a reverse push return mode, namely, the current is detected by a Hall element with highest existing precision from a structural form of an energy storage direct current side system-group (cluster) -rack (cabinet) -PACK-module-cell, the primary error is 5 percent, the tertiary error is at least 15 percent, and the influence of temperature drift and electromagnetic compatibility can not meet the basic requirement that the estimation precision of the SOC of an energy storage system is less than 10 percent at all; 3. the anti-interference design of the BMS is poor, so that data loss occurs on a data layer, and even a technical joker with a charge amount smaller than a discharge amount is caused; 4. the core of thermal runaway of lithium batteries is the single cell and its spreading results, while the main culprit of thermal runaway is the transient temperature surge caused by over-current and not others.
Disclosure of Invention
The invention aims to provide a detection circuit and a detection system of a battery module, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a detection circuit of battery module, includes topology circuit, primary winding, excitation system, processing system and a plurality of secondary winding, a plurality of secondary winding respectively with monomer electric core electric connection, a plurality of secondary winding with the primary winding opposition sets up, primary winding with H bridge (or other full bridge) topology circuit input electric connection, H bridge (or other full bridge) topology circuit's output with processor electric connection.
Preferably, each secondary winding is insulated and isolated from each other.
Preferably, the detection method of the detection circuit specifically includes the following steps:
step one, completing the design of an excitation system based on a multi-layer PCB framework according to the capacity specification of a selected battery core, a grouping model, the maximum charge and discharge work multiplying power and redundancy;
step two: after the excitation system based on the multilayer PCB framework is completed, the primary and secondary side system design is completed according to the difference of the battery cell grouping modes;
step three: based on the superimposed alternating current component in the excitation system, alternating magnetic flux and alternating voltage are generated in the primary side and the secondary side, so that the voltage of each single battery cell at the secondary side can be detected in real time;
step four: based on alternating magnetic flux in an excitation system, alternating voltages generated on a primary side are in odd-even superposition, and even harmonic values are different in quality no matter whether current passes through the primary side system or not, so that the alternating voltages can be used as detection measurement references;
step five: based on the linear sensitivity characteristic of the magnetic device to temperature and the characteristic curve of the magnetic device and voltage, the scheme can realize the three-in-one real-time detection and collection of the voltage, the current and the temperature of the single battery cell.
A detection system of a battery module, comprising:
a detection circuit module comprising a detection circuit of a battery module according to any one of the preceding claims 1-2;
the PCB transformer module comprises a plurality of secondary windings, primary windings and an excitation system, and a plurality of single cells contained in the battery module are respectively and electrically connected with the secondary windings;
the processor module is electrically connected with the output end of the PCB transformer module;
and the protection device module is electrically connected with the processor module.
Preferably, the number of the secondary windings is kept consistent with the number of the single battery cells in the battery module, and each secondary winding is respectively and correspondingly connected with the single battery cells individually.
Preferably, the PCB transformer module adopts different line widths and magnetic core devices, meanwhile, the PCB transformer module also adopts different excitation system amplitude and frequency designs, and the PCB transformer module can match with full-bridge power devices with different power classes and voltages according to the quantity and the capacity of single battery cores.
Preferably, the PCB transformer module adopts a multilayer board technology, the primary winding is arranged in the inner layer, and the secondary winding adopts a wiring mode.
Preferably, the amplitude, frequency and phase of the alternating current component of the excitation system are preset to be in an optimal state matched with the battery cell group.
Preferably, the protection device module comprises a breaker or an MOS tube, and when the current difference value is larger or the current value is abnormally surge, the protection device module can directly cut off the single battery cell from the system, compared with the prior art, the protection device module has the beneficial effects that:
(1) The detection circuit disclosed by the invention has the advantages of simple circuit structure, less heating during testing, high precision, convenience in installation, simplicity in detection and less influence on the packaging of the battery, and is convenient for a user to connect the battery to the detection circuit for detection.
(2) According to the battery module detection method based on the battery cells, the voltage, the current and the temperature of each single battery cell are detected respectively, the circuit is simple and easy to realize, and through regular regression correction with the internal resistance value and the capacity value when leaving a factory, the most reliable and accurate SOC and the internal resistance value can be provided for an energy storage system, wherein the SOC precision can be estimated to be within 5% -10%, the error rate of not less than 15% compared with the SOC precision of the conventional BMS at present is greatly improved, and a solid technical foundation is laid for future large-scale centralized energy storage application.
(3) According to the detection system of the battery module based on the battery cell, disclosed by the invention, the detection system can be used for detecting the current, the voltage and the temperature of the single battery cell of the battery module respectively and sending detected data to the processor, and when the processor detects that the current difference value is large or the current value is abnormally and violently increased, the single battery cell can be directly cut off from the system through the protection device, so that the other single battery cells are not influenced, and the safety of the battery module is ensured.
Drawings
FIG. 1 is a block diagram of a detection system of the present invention;
FIG. 2 is a block diagram of the steps of the detection method of the present invention;
FIG. 3 is a circuit diagram of a PCB transformer of the present invention;
fig. 4 is a structural diagram of a PCB board of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
a battery module detection method based on an electric core comprises the following steps:
step one, according to the selected single cell specification, the grouping mode of the battery modules, the charge and discharge current under the maximum multiplying power working condition and the redundant design requirement, the design of a PCB transformer and an excitation system is completed, and a functional interface of active equalization of a cell level is completed;
step two, calibrating the designed PCB transformer and excitation system, and correcting according to the actually measured voltage and the voltages at two ends of the secondary winding of the PCB transformer;
loading an excitation system, and acquiring alternating voltage data matched with the number of the battery cells on the secondary side;
step four, closing the primary winding, and obtaining a primary alternating voltage value corresponding to the secondary winding, the magnetic device and the turn ratio at the primary side;
step five, separating odd-even harmonic components in the original transformer winding, and defining even-even harmonic as a measurement reference;
and step six, realizing the real-time acquisition of the current of the battery cell through a PCB transformer with an excitation system, and simultaneously realizing the reading of the voltage and temperature real-time data of the battery cell through a peripheral circuit.
According to the detection method, each single battery cell is detected, the voltage, the current and the temperature of the single battery cell are detected, the circuit is simple and easy to realize, and through regular regression correction with the internal resistance value when leaving a factory, the most reliable and accurate SOC and the internal resistance value can be provided for an energy storage system, wherein the SOC precision can be estimated to be within 5% -10%, the error rate of not lower than 15% of the SOC precision of the conventional BMS is greatly improved, and a solid technical foundation is laid for future large-scale centralized energy storage application.
In this embodiment, in the first step, the number of secondary windings and the number of secondary windings of the PCB board transformer, the amplitude and the frequency of the excitation system are set according to the number and the capacity of the single battery cells, and the secondary windings are mutually insulated and isolated, so that the number of the single battery cells and the number of the secondary windings are consistent, each secondary winding is separately connected with the single battery cells, the PCB board transformer and the excitation system adopt different line widths and magnetic core devices, and the full-bridge power devices with different power levels and voltages can be matched according to the number and the capacity of the single battery cells, so that the balance among the single battery cells, the modules, the PACK and the rack (cabinet) can be easily realized as required, thereby being beneficial to improving the circulation efficiency of the energy storage system.
In the embodiment, the odd-even harmonic component in the original transformer winding is separated, even-even harmonic is defined as a measurement reference, and in the sixth step, the real-time acquisition of the cell current is realized through a PCB transformer with an excitation system, and meanwhile, the reading of the cell voltage and temperature real-time data is realized through a peripheral circuit.
If the difference exists, whether the battery core has a problem or not is judged, if the current difference value is large or the current value abnormally and violently rises, the single battery core can be directly cut off from the system through the protection device, and in specific use, the protection device can be an action switch such as a relay, a fuse and the like.
Specifically, in actual use, the capacity of a single battery cell matched with the PCB transformer and the excitation system is 300Ah/3.2V or less; rated charge-discharge working multiplying power is 0.5C 10 Maximum working magnification is 1C 10 The proposal considers the allowance to be 0.8C 10 The method comprises the steps of carrying out a first treatment on the surface of the Module and PACK group mode: suggesting to adopt 6 or 8 and constructing a module; the 2 modules are serially connected to form a PACK.
Embodiment two:
referring to fig. 1-3, a detection circuit of a battery module includes a topology circuit, a primary winding, an excitation system, a processing system and a plurality of secondary windings, wherein the secondary windings are respectively electrically connected with a single battery cell, the secondary windings are mutually insulated and isolated, the secondary windings are oppositely arranged with the primary winding, the primary winding is electrically connected with an input end of an H-bridge (or other full-bridge) topology circuit, and an output end of the H-bridge (or other full-bridge) topology circuit is electrically connected with the processor.
The detection circuit is simple in structure, small in heating and high in precision during testing, convenient to install and simple to detect, influences on battery packaging are small, and a user can conveniently connect the battery to the detection circuit for detection.
Embodiment III:
referring to fig. 1-3, a detection system of a battery module, the battery module includes a plurality of unit cells, including:
a detection circuit module comprising a detection circuit of a battery module according to any one of the preceding claims 1-2;
the PCB transformer module comprises a plurality of secondary windings, primary windings and an excitation system, and a plurality of single cells contained in the battery module are respectively and electrically connected with the secondary windings;
the processor module is electrically connected with the output end of the PCB transformer module;
and the protection device module is electrically connected with the processor module.
From the above, the detection system can detect the current, the voltage and the temperature of the single battery cells of the battery module respectively, and send detected data to the processor module, when the processor module detects that the current difference value is large or the current value is abnormally and violently increased, the single battery cells can be directly cut off the system through the protection device module, so that other single battery cells are not influenced, and the safety of the battery module is ensured.
The number of the secondary windings is kept consistent with the number of the single battery cells in the battery module, and each secondary winding is respectively and singly connected with the single battery cells in a one-to-one correspondence.
The PCB transformer module adopts different line widths and magnetic core devices, meanwhile, the PCB transformer module also adopts different excitation system amplitude and frequency designs, and the PCB transformer module can be matched with full-bridge power devices with different power classes and voltages according to the quantity and the capacity of single battery cores.
The PCB transformer module adopts a multilayer board technology, the primary winding is arranged in an inner layer, and the secondary winding adopts a wiring mode.
The amplitude, frequency and phase of the alternating current component of the excitation system are preset to be in an optimal state matched with the battery cell group.
From the above, the current of the single battery core can be directly read through the PCB transformer module, and when the battery core is connected to the secondary winding, an AC source I is loaded on the excitation system e Then, an alternating voltage U matched with the number of the electric cores is generated on the secondary winding 2 、U 3 、U 4 … …, and the line width and the characteristic parameters of the magnetic device of the secondary winding are completely the same in the design process, and a reverse serial connection mode is adopted, so that the method is not difficult to obtain: u (U) 2 ＝-U 3 ＝U 4 And u=u 2 +(-U 3 )+U 4 When the primary winding is closed, an alternating magnetic flux exists in the magnetic core, and a corresponding alternating voltage U is generated on the primary winding 1 The voltage characteristic is U 1 ＝U Odd, even +U Doll (doll) Corresponding current value I 1 The odd harmonic values in the pair of the magnetic devices are identical, the current values in the even harmonic are different, and the current values can be used as measurement references for current detection.
The protection device module comprises a breaker or an MOS tube, and when the current difference value is larger or the current value is abnormally and violently increased, the single battery cell can be directly cut off from the system through the protection device module.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A detection circuit of a battery module is characterized in that: the device comprises a topology circuit, a primary winding, an excitation system, a processing system and a plurality of secondary windings, wherein the secondary windings are respectively and electrically connected with a single battery cell, the secondary windings are oppositely arranged with the primary winding, the primary winding is electrically connected with the input end of an H-bridge (or other full-bridge) topology circuit, and the output end of the H-bridge (or other full-bridge) topology circuit is electrically connected with a processor.
2. The detection circuit of a battery module according to claim 1, wherein: the secondary windings are mutually insulated and isolated.
3. The detection circuit of a battery module according to claim 1, wherein: the detection method of the detection circuit specifically comprises the following steps:
step one, completing the design of an excitation system based on a multi-layer PCB framework according to the capacity specification of a selected battery core, a grouping model, the maximum charge and discharge work multiplying power and redundancy;
step two: after the excitation system based on the multilayer PCB framework is completed, the primary and secondary side system design is completed according to the difference of the battery cell grouping modes;
step three: based on the superimposed alternating current component in the excitation system, alternating magnetic flux and alternating voltage are generated in the primary side and the secondary side, so that the voltage of each single battery cell at the secondary side can be detected in real time;
step four: based on alternating magnetic flux in an excitation system, alternating voltages generated on a primary side are in odd-even superposition, and even harmonic values are different in quality no matter whether current passes through the primary side system or not, so that the alternating voltages can be used as detection measurement references;
step five: based on the linear sensitivity characteristic of the magnetic device to temperature and the characteristic curve of the magnetic device and voltage, the scheme can realize the three-in-one real-time detection and collection of the voltage, the current and the temperature of the single battery cell.
4. A detection system of a battery module, comprising:
a detection circuit module comprising a detection circuit of a battery module according to any one of the preceding claims 1-2;
the PCB transformer module comprises a plurality of secondary windings, primary windings and an excitation system, and a plurality of single cells contained in the battery module are respectively and electrically connected with the secondary windings;
the processor module is electrically connected with the output end of the PCB transformer module;
and the protection device module is electrically connected with the processor module.
5. The detection system of a battery module according to claim 4, wherein: the number of the secondary windings is kept consistent with the number of the single battery cells in the battery module, and each secondary winding is respectively and singly connected with the single battery cells in a one-to-one correspondence.
6. The detection system of a battery module according to claim 4, wherein: the PCB transformer module adopts different line widths and magnetic core devices, meanwhile, the PCB transformer module also adopts different excitation system amplitude and frequency designs, and the PCB transformer module can be matched with full-bridge power devices with different power classes and voltages according to the quantity and the capacity of single battery cores.
7. The detection system of a battery module according to claim 4, wherein: the PCB transformer module adopts a multilayer board technology, the primary winding is arranged in an inner layer, and the secondary winding adopts a wiring mode.
8. The detection system of a battery module according to claim 4, wherein: the amplitude, frequency and phase of the alternating current component of the excitation system are preset to be in an optimal state matched with the battery cell group.
9. The detection system of a battery module according to claim 4, wherein: the protection device module comprises a breaker or an MOS tube, and when the current difference value is larger or the current value is abnormally and violently increased, the single battery cell can be directly cut off from the system through the protection device module.
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| CN202310683944.2A CN116699447A (en) | 2023-06-10 | 2023-06-10 | Detection circuit and detection system of battery module |
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| CN202310683944.2A CN116699447A (en) | 2023-06-10 | 2023-06-10 | Detection circuit and detection system of battery module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517993A (en) * | 2023-11-02 | 2024-02-06 | 安徽智途科技有限公司 | Intelligent vehicle battery energy management method and system based on battery cell performance evaluation |
| CN117517993B (en) * | 2023-11-02 | 2024-05-17 | 安徽智途科技有限公司 | Intelligent vehicle battery energy management method and system based on battery cell performance evaluation |
-
2023
- 2023-06-10 CN CN202310683944.2A patent/CN116699447A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517993A (en) * | 2023-11-02 | 2024-02-06 | 安徽智途科技有限公司 | Intelligent vehicle battery energy management method and system based on battery cell performance evaluation |
| CN117517993B (en) * | 2023-11-02 | 2024-05-17 | 安徽智途科技有限公司 | Intelligent vehicle battery energy management method and system based on battery cell performance evaluation |
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