WO2023035392A1 - Système de détection en série pour la formation et le classement de capacité d'une batterie au lithium-ion - Google Patents

Système de détection en série pour la formation et le classement de capacité d'une batterie au lithium-ion Download PDF

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Publication number
WO2023035392A1
WO2023035392A1 PCT/CN2021/128844 CN2021128844W WO2023035392A1 WO 2023035392 A1 WO2023035392 A1 WO 2023035392A1 CN 2021128844 W CN2021128844 W CN 2021128844W WO 2023035392 A1 WO2023035392 A1 WO 2023035392A1
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WIPO (PCT)
Prior art keywords
battery
module
series
switch
main circuit
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PCT/CN2021/128844
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English (en)
Chinese (zh)
Inventor
张兴旺
孙君光
秦茂
赖前程
解建伟
杨康佳
Original Assignee
广州擎天实业有限公司
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Priority to KR1020247011285A priority Critical patent/KR20240058910A/ko
Publication of WO2023035392A1 publication Critical patent/WO2023035392A1/fr

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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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
    • 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]
    • G01R31/3644—Constructional arrangements
    • 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
    • G01R1/02—General constructional details
    • G01R1/04—Housings; Supporting members; Arrangements of terminals
    • G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
    • G01R1/0425—Test clips, e.g. for IC's
    • 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]
    • G01R31/371—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with remote indication, e.g. on external chargers
    • 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
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • 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]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • 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
    • 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
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • 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

Definitions

  • the invention relates to the technical field of detection of composition and capacity of lithium ion secondary batteries, in particular to a series detection system of composition and capacity of lithium power batteries.
  • lithium power battery series detection technology can significantly improve battery series charging and discharging due to efficiency improvement and battery consistency.
  • the battery cells have gradually developed from a few ampere-hours, tens of ampere-hours to hundreds of ampere-hours, and the system capacity of series-connected batteries is getting larger and larger; other process requirements are also getting higher and higher, such as single
  • the battery is discharged to a very low voltage (below 1V, even to 0V), etc.
  • a new topology must be invented. For example, adopt multi-power module parallel mode, add power supply module, etc.
  • An embodiment of the present invention provides a series detection system for the composition and capacity of lithium power batteries, including:
  • a bidirectional power module includes at least one AC-DC module and at least one DC-DC module, and the bidirectional power module provides different power through different combinations of the AC-DC module and the DC-DC module , form a series circuit with different numbers of batteries to realize battery charging and discharging;
  • the battery series main circuit is connected to the bidirectional power module and the supplementary power supply.
  • the battery series main circuit includes several switch control modules and several batteries connected in series, each of the switch control modules is used to control a single battery connection or log out online;
  • the supplementary power supply is connected in series with the battery series main circuit, and is used to increase the voltage of the battery series main circuit, so as to continue charging and discharging when there is only one battery left in the battery series main circuit, until the formation is satisfied. Or the cut-off voltage of the sub-capacity process;
  • a press including a probe or a fixture, the probe or the fixture is connected to the switch control module through a cable, and the press also includes a pressing mechanism, and the pressing mechanism realizes the normalization of the battery through electrical control.
  • the negative electrode is in contact with the probe or the clamp, so that the battery is connected to the switch control module;
  • the control system is the hub of information collection, control, and interaction.
  • the control system controls the press-fitting mechanism to connect the battery with the probe or the fixture during the process of chemical composition and containment process, and through
  • the switch control module connects the battery in series to the battery series main circuit, controls the bidirectional power module to charge and discharge the battery on the battery series main circuit, collects battery data in real time, and controls the battery to exit online and /or perform security control operations for chemical composition and volumetric processes;
  • the monitoring center is used to issue execution instructions of the capacity-forming process flow, monitor the operation status of the capacity-dividing process flow according to the battery data, and store, count and analyze the battery data.
  • the battery capacity detection system provided by the embodiment of the present invention has at least the following beneficial effects: the embodiment of the present invention provides different power through different combinations of the AC-DC module and the DC-DC module in the bidirectional power module, and can cope with different A large number of batteries have different current requirements when performing series formation or capacity division processes, so as to adapt to the flexible and changeable detection requirements of batteries; in addition, the embodiment of the present invention also provides a supplementary power supply connected in series with the battery series main circuit, which can improve battery series connection. The voltage of the main circuit can continue to charge and discharge when there is only one battery left in the main circuit of the battery series, until it meets the cut-off voltage of the forming or capacity dividing process.
  • the AC-DC module includes a first input end and a first output end
  • the DC-DC module includes a second input end and a second output end
  • the first input end is connected to an AC grid
  • the first output end is connected to the second input end
  • the second output end is connected to the battery series main circuit.
  • the AC-DC includes two modes, one is a power frequency transformer-isolated AC-DC, the other is a high-frequency transformer-isolated AC-DC, and the AC-DC module is two Above, the AC-DC modules are connected in parallel, the control system adopts current sharing control between the AC-DC modules, the DC-DC modules are more than two, and the DC-DC modules connected in parallel, the control system adopts current sharing control between the DC-DC modules.
  • the probes include current probes and voltage probes
  • the clamps include current clamps and voltage clamps
  • the press system is used to connect the positive and negative electrodes of the batteries on the battery tray to the The current probe or the current clamp, the voltage probe or the voltage clamp are contacted by pressing.
  • the switch control module includes a direct switch module and a bypass switch module, the direct switch module is connected in series with the battery, and the bypass switch module is connected in parallel to the branch formed by the direct switch module and the battery,
  • Each of the switch control modules independently controls each of the batteries connected in series to the battery series main circuit or withdrawn from the battery series main circuit.
  • the direct switch module and the bypass switch module are obtained by combining several electronic switch tubes according to the battery series structure and charging and discharging requirements, and the direct switch module and the bypass switch module are interlocked Control to realize the function of preventing the battery from being reversed and the battery from being withdrawn online.
  • the direct switch module and the bypass switch module include electrical control switches, and diodes are connected in parallel to the electrical control switches.
  • the supplementary power supply is a bidirectional DC power supply capable of rectification and inversion
  • the detection system includes at least one supplementary power supply to increase the DC side voltage of the bidirectional power module.
  • control system further includes an acquisition module, the acquisition module includes a voltage detection module for detecting battery voltage, a current detection module for detecting battery current, and a temperature detection module for detecting battery temperature,
  • acquisition module includes a voltage detection module for detecting battery voltage, a current detection module for detecting battery current, and a temperature detection module for detecting battery temperature
  • the control system is also used for receiving the execution instruction issued by the monitoring center and uploading the battery data to the monitoring center, the battery data including battery voltage, battery current and battery temperature.
  • the press is used to control the probe or the clamp to contact or separate from the battery according to the execution instruction issued by the monitoring center.
  • Fig. 1 is a schematic diagram of the structural connection of a detection system provided by an embodiment of the present invention
  • Fig. 2 is a schematic circuit diagram of a direct switch and a bypass switch connected to a battery provided by an embodiment of the present invention
  • 3-5 are three circuit diagrams of a switch module provided by an embodiment of the present invention.
  • 6-9 are schematic diagrams of module connection of a bidirectional power module provided by an embodiment of the present invention.
  • Figures 10-12 are schematic diagrams of the connection between the two-way power module and the location configuration relationship provided by an embodiment of the present invention.
  • the formation and capacity separation equipment of lithium power batteries usually adopts the formation or capacity separation process in the form of batteries connected in parallel, and each channel corresponds to a battery for charging and discharging.
  • N power lines from the power supply to the battery lead to problems such as multiple power loops, large device and line losses, and high equipment costs. If the batteries are connected in series for formation or capacity division, only one series circuit and one power supply are needed to keep the current on the series circuit consistent, which is beneficial to improve the performance of the battery, save cables and reduce the lines on the cables loss.
  • the embodiment of the present invention provides a series detection system for lithium power battery composition and capacity. Based on the form of battery series composition and capacity, a set of full-process detection system for composition and capacity is constructed, and the current of different numbers of batteries In the case of different requirements, the combination of AC-DC module and DC-DC module is used to provide matching current for the battery to meet the requirements of different chemical capacity scenarios.
  • an embodiment of the present invention provides a detection system, including:
  • a bidirectional power module includes at least one AC-DC module and at least one DC-DC module, and the bidirectional power module provides different power through different combinations of the AC-DC module and the DC-DC module , form a series circuit with different numbers of batteries to realize battery charging and discharging;
  • the battery series main circuit is connected to the bidirectional power module and the supplementary power supply.
  • the battery series main circuit includes several switch control modules and several batteries connected in series, each of the switch control modules is used to control a single battery connection or log out online;
  • the supplementary power supply is connected in series with the battery series main circuit, and is used to increase the voltage of the battery series main circuit, so as to continue charging and discharging when there is only one battery left in the battery series main circuit, until the formation is satisfied. Or the cut-off voltage of the sub-capacity process;
  • a press including a probe or a fixture, the probe or the fixture is connected to the switch control module through a cable, and the press also includes a pressing mechanism, and the pressing mechanism realizes the normalization of the battery through electrical control.
  • the negative electrode is in contact with the probe or the clamp, so that the battery is connected to the switch control module;
  • the control system is the hub of information collection, control, and interaction.
  • the control system controls the press-fitting mechanism to connect the battery with the probe or the fixture during the process of chemical composition and containment process, and through
  • the switch control module connects the battery in series to the battery series main circuit, controls the bidirectional power module to charge and discharge the battery on the battery series main circuit, collects battery data in real time, and controls the battery to exit online and /or perform security control operations for chemical composition and volumetric processes;
  • the monitoring center is used to issue execution instructions of the capacity-forming process flow, monitor the operation status of the capacity-dividing process flow according to the battery data, and store, count and analyze the battery data.
  • the battery series main circuit is set in the storage space of the detection system.
  • the battery series main circuit is formed by connecting several switch control modules in series.
  • Each switch control module can be connected to a single battery to control the battery.
  • the battery is charged and discharged, so that the series connection of the battery is realized through the series switch control module. Due to the characteristics of the series circuit, the disconnection of a certain point in the series connection will cause the disconnection of the entire series circuit. Therefore, the capacity detection system of the battery series composition in the embodiment of the present invention has the function of battery online withdrawal.
  • the switch control module includes a direct switch and a bypass switch. When disconnected, the bidirectional power module can charge and discharge the battery.
  • the direct circuit switch and the bypass switch adopt interlocking control, which can prevent the short circuit of the battery and the open circuit of the series circuit during the online switching process of the current from the direct circuit to the bypass.
  • the direct switch and the bypass switch are combined by electronic switch tubes according to different battery structures and requirements, and can be placed in different positions. Please refer to the circuit connection schematic diagram in Figure 2.
  • the structures of the straight-through switch and the bypass switch are described below through specific examples.
  • the direct switch includes a first switch tube and a second switch tube
  • the bypass switch includes a third switch tube
  • the first switch tube, the second switch tube, and the third switch tube are all A body diode or a unidirectional diode is connected in parallel, the first switch tube and the second switch tube are connected in series, and the first switch tube and the third switch tube are connected at one pole.
  • the first switch tube, the second switch tube and the third switch tube as MOSFETs as an example, the first switch tube, the second switch tube and the third switch tube all have body diodes, and the direction of the body diodes is from source to drain In the direction of poles, in terms of circuit structure, the first switching tube and the second switching tube are in the same branch, and the first switching tube and the third switching tube are respectively in two branches connected by one pole. It can be seen from Figure 2 that when the battery has been connected to the direct circuit switch, the first switch tube and the second switch tube are turned on, and the third switch tube is cut off.
  • each switch control module can be independently controlled to realize the online withdrawal of the battery without affecting other batteries in the battery series main circuit.
  • MOSFET is only one implementation manner of the switch tube, and the above-mentioned switch tube can also be implemented by using an IGBT, a relay connected in parallel with a diode, and the like.
  • the direct switch includes a first switch tube and a second switch tube
  • the bypass switch includes a third switch tube and a fourth switch tube
  • Both the third switch tube and the fourth switch tube have a body diode or a one-way diode connected in parallel
  • the first switch tube and the second switch tube are connected in series
  • the first switch tube and the third switch tube are connected to one pole.
  • the first switching tube, the second switching tube, the third switching tube and the fourth switching tube as MOSFETs as an example
  • the first switching tube, the second switching tube, the third switching tube and the fourth switching tube all have body diodes
  • the direction of the body diode is from the source to the drain.
  • the first switch tube and the second switch tube are in the same branch, and the third switch tube and the fourth switch tube are in the same branch.
  • the first switch tube is in the same branch.
  • the switch tube and the third switch tube are respectively in two branches connected with one pole. It can be seen from Figure 3 that when the battery has been connected to the direct circuit switch, the first switch tube and the second switch tube are turned on, and the third switch tube is turned off.
  • each switch control module can be independently controlled to realize the online withdrawal of the battery. It will not affect other batteries in the battery series main circuit.
  • MOSFET is only one implementation manner of the switch tube, and the above-mentioned switch tube can also be implemented by using an IGBT, a relay connected in parallel with a diode, and the like.
  • the series position relationship between the first switch tube, the second switch tube and the battery can be adjusted as required.
  • the first switch tube, the battery and the second switch tube are connected in series in sequence.
  • the embodiment of the present invention does not limit the series positional relationship between the first switch tube and the second switch tube and the battery, nor does it limit the straight switch to only be composed of the first switch tube and the second switch tube, and of course does not limit the bypass switch It can only be composed of the third switching tube and the fourth switching tube. Since there are many ways of composition, they will not be listed here one by one. Realizing the battery online exit function through the electronic switch should be within the scope of protection of the present invention.
  • the installation combinations of the above switch control modules are diverse, and can be customized according to different battery requirements and the installation space of the storage location. They can be installed individually or in combination.
  • a single switch control module can be installed on the PCB board.
  • a single switch control module can also be packaged in one installation box, multiple switch control modules can be collectively installed on the PCB board, or multiple switch control modules can be packaged in one installation box.
  • the AC-DC in the bidirectional power module includes two modes, one is the power frequency transformer isolated AC-DC, and the other is the high frequency transformer isolated AC-DC.
  • the AC-DC module includes a first input end and a first output end
  • the DC-DC module includes a second input end and a second output end, the first input end is connected to an AC source, the first output end is connected to a second input end, and the second The output terminal is connected to the battery series main circuit. It should be noted that the bidirectional power module can be implemented in various ways, and several specific ways will be described below as examples.
  • the bidirectional power module includes an AC-DC module and a DC-DC module, the first input terminal of the AC-DC module is connected to the three-phase AC input, and the first output terminal of the AC-DC module is a DC output and connected to the DC - the second input terminal of the DC module, the second output terminal of the DC-DC module is also a DC output and connected to the input terminal of the battery series main circuit to provide a DC source for the battery series main circuit.
  • the bidirectional power module includes a plurality of AC-DC modules and a DC-DC module, the first input ends of the plurality of AC-DC modules are connected to the three-phase AC input, and the first output ends of the plurality of AC-DC modules Both are connected to the second input terminal of the DC-DC module, and the second output terminal of the DC-DC module is connected to the input terminal of the battery series main circuit, wherein a plurality of AC-DC modules are connected in parallel, and the AC-DC module Between the use of current control.
  • the bidirectional power module includes an AC-DC module and multiple DC-DC modules, the first input terminal of the AC-DC module is connected to the three-phase AC input, and the first output terminal of the AC-DC module separates multiple The first line is connected to the second input end of multiple DC-DC modules, and the second output end of multiple DC-DC modules is connected to the input end of the battery series main circuit in parallel, wherein the multiple DC-DC modules are connected in parallel, Current sharing control is adopted between DC-DC modules.
  • the bidirectional power module includes a plurality of AC-DC modules and a plurality of DC-DC modules, the first input ends of the plurality of AC-DC modules are connected to the three-phase AC input, and the first outputs of the plurality of AC-DC modules Multiple lines are separated from the terminal and connected to the second input terminals of multiple DC-DC modules, and the second output terminals of multiple DC-DC modules are connected to the input terminals of the battery series main circuit.
  • multiple AC-DC modules In parallel connection current sharing control is adopted between AC-DC modules; when multiple DC-DC modules are in parallel connection, current sharing control is adopted between DC-DC modules.
  • the embodiments of the present invention provide corresponding power through different combinations of AC-DC modules and DC-DC modules.
  • the input terminal of the bidirectional power module is connected to the AC grid (usually connected to 380V AC or 220V AC), which provides the functions of taking power from the AC grid and feeding back the power of the battery to the AC grid.
  • the above-mentioned supplementary power supply is a bidirectional DC power supply with rectification and inverter capabilities
  • the detection system includes at least one supplementary power supply (one or more than two connected in parallel) to increase the voltage of the battery series main circuit and realize battery In the series main circuit, when there is only one battery left, it can still continue to charge and discharge until the cut-off voltage of the formation or capacity separation process is met.
  • the supplementary power supply can be set in different positions in the battery series main circuit. For example, it is set between the battery and the battery of the battery series main circuit, and is set at the starting position or the end position of the battery series main circuit, etc. starting position), which is not limited here.
  • one bidirectional power module can correspond to one chemical storage location.
  • a bidirectional power module when there are multiple chemical storage locations, the chemical storage locations are connected in series through a battery series circuit, and the ACDC and DCDC combinations inside a bidirectional power module can refer to the one-to-one configuration shown in Figures 6 to 9 above. , many-to-one, one-to-many, and many-to-many combinations, if a bidirectional power module can provide enough power for the batteries in these composition storage locations, then one bidirectional power module can correspond to multiple composition storage locations . In some cases, if one bidirectional power module cannot provide enough power for the batteries in these compartmentalized storage locations, two or more bidirectional power modules can be used to combine these bidirectional power modules (such as connected in parallel via cables) to provide enough power for the battery.
  • the press includes a cylinder, a battery tray and a battery probe.
  • the cylinder is controlled electrically, and the position of the battery tray is controlled by the cylinder to control the contact between the battery probe and the positive and negative poles of the battery.
  • the battery probe includes a current probes and voltage probes.
  • the press is a working platform for mechanical transmission and crimping of battery automation production.
  • the control system sends control signals to the press, and the press can control the pallet to rise and fall according to the control signal, and control the contact between the battery probe and the positive and negative electrodes of the battery. , to complete the physical connection between the battery series main circuit and the battery, etc.
  • the press also includes functions such as negative pressure control, tray detection, cylinder position detection, and smoke alarm, which will not be described in detail here.
  • the press can also adopt a jig-type or other mechanical structure to meet the mechanical operation requirements of different chemical composition and capacity of the battery, which will not be listed here.
  • the battery probe in the above-mentioned press can be replaced by a battery clamp, and the battery clamp performs a process of dividing or dividing the battery by contacting the positive and negative electrodes of the battery.
  • the clamp includes a current clamp and a voltage clamp.
  • the detection system in the embodiment of the present invention also includes an information collection module, the information collection module includes a voltage detection module for detecting the battery voltage, the voltage detection module is connected to the control system signal, and the control system can monitor the battery in real time by receiving the voltage signal from the collection module operating conditions to avoid overvoltage and overcurrent of the battery.
  • the detection system in the embodiment of the present invention may also include other auxiliary modules, such as a temperature sensor that collects the temperature of the positive pole and the negative pole of the battery to provide over-temperature monitoring for the detection system.
  • auxiliary modules can be set by themselves according to monitoring needs, and will not be listed here.
  • the battery series main circuit of the embodiment of the present invention also has the function of preventing battery reverse connection.
  • the voltage detection module can learn the voltage situation in the battery series main circuit. In the normal voltage range (for example, the positive and negative voltages are reversed), the control system can issue an alarm or disconnect the switch control module currently connected to the battery to avoid the risk of battery reverse connection.
  • the specific connection relationship of the detection system in the embodiment of the present invention can refer to Figure 1, including multiple components, mainly monitoring center, control system, bidirectional power module, battery series main circuit, supplementary power supply, press (including battery tray),
  • the various parts are interconnected through the internal bus to complete functions such as command sending, execution and information interaction.
  • the monitoring center edits and distributes the process according to the needs of the battery formation and capacity process, including working step status, working step time, current, upper limit voltage, lower limit voltage, cut-off current, cut-off capacity, working step protection parameters and negative pressure parameters, etc.
  • Parameter setting is also responsible for data display and data analysis, that is, displaying the working step status, working step time, battery voltage, current, capacity, energy, current line voltage, auxiliary voltage, battery positive temperature, and battery negative temperature of each series battery In addition, it also monitors the operating conditions of the series batteries and displays fault alarms.
  • the control system is used for system control and information collection, information interaction with the monitoring center, and interactive control and command transmission with the bidirectional power module, battery series main circuit, power supply, press, etc. According to the technical process of component capacity, the on and off commands are sent to the battery series main circuit to realize the on-off control of the direct switch and the bypass switch.
  • the control system also receives the operating condition data of all batteries in the battery series main circuit, and performs data processing. After processing, it is sent to the monitoring center.
  • the detection system for the above-mentioned lithium power battery in series into capacity realizes the series connection of the batteries through the battery series main circuit in the capacity out storage position, and at the same time, the control system can independently control each battery in the capacity out process through a separate switch control module.
  • the bidirectional power module of the present invention provides different power by adopting different combinations of AC-DC modules and DC-DC modules, so as to meet different requirements when different numbers of batteries are used for the formation and capacity process. current demand.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

La présente invention divulgue un système de détection en série pour la formation et le classement de la capacité d'une batterie au lithium-énergie. Le système de détection comprend un circuit principal de série de batteries, un module de puissance bidirectionnel, une alimentation électrique de charge, une presse, un système de commande et un centre de surveillance, le circuit principal de série de batteries comprenant une pluralité de batteries et des modules de commande de commutation utilisés pour connecter les batteries en série; le module de puissance bidirectionnel comprenant au moins un module CA-CC et au moins un module CC-CC; et la presse comprenant un mécanisme d'ajustement par pression et une sonde ou une pince. Le module de puissance bidirectionnelle de modes de réalisation de la présente invention fournit une puissance différente en utilisant différents modes de combinaison du module CA-CC et du module CC-CC; la connexion en série des batteries est réalisée au moyen du circuit principal de série de batteries; au moyen d'une commande coopérative du module de puissance bidirectionnel, du circuit principal de série de batteries, de l'alimentation électrique de charge, et de la presse, une fonction de charge/décharge en série de la pluralité de batteries est réalisée, et la sortie en ligne d'une seule batterie est réalisée, de telle sorte que les exigences de traitement de la formation ou du classement de capacité de la batterie de puissance au lithium sont satisfaites, et en particulier, les exigences peuvent encore être satisfaites lorsque la tension de décharge de la batterie unique est nécessaire pour être très faible.
PCT/CN2021/128844 2021-09-09 2021-11-05 Système de détection en série pour la formation et le classement de capacité d'une batterie au lithium-ion WO2023035392A1 (fr)

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