CN115425307A - System and method for reducing lithium battery formation capacity-grading starting impact current - Google Patents
System and method for reducing lithium battery formation capacity-grading starting impact current Download PDFInfo
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- CN115425307A CN115425307A CN202211155108.9A CN202211155108A CN115425307A CN 115425307 A CN115425307 A CN 115425307A CN 202211155108 A CN202211155108 A CN 202211155108A CN 115425307 A CN115425307 A CN 115425307A
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- 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
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Abstract
本发明公开了一种降低锂电池化成分容启动冲击电流的系统及方法，该系统包括：采集模块、切换控制模块、运放模块、电池接入模块和充放电机模块；切换控制模块用于先后切换电池接入模块和充放电机模块接入运放模块；采集模块用于分别采集电池接入模块和充放电机模块的输出电压经过运放模块放大后的电压值，并将所述电压值输出至控制模块；控制模块用于控制所述切换控制模块的切换；在充放电机模块接入运放模块后，对所述充放电机的输出电压开启闭环控制，使所述充放电机的输出电压值上升至闭环控制的预设电压值，并控制所述电池接入模块接入所述充放电机模块完成充放电启动。本发明中降低锂电池化成分容启动冲击电流的系统，保证了在将锂电池接入充放电机进行充放电启动时，最大限度地减小冲击电流，使锂电池最终的性能更加稳定。
The invention discloses a system and method for reducing the inrush current of a lithium battery formed into a capacity starting. The system includes: an acquisition module, a switching control module, an operational amplifier module, a battery access module, and a charging and discharging machine module; the switching control module is used for Switch the battery access module and the charge-discharge module to the op-amp module successively; the acquisition module is used to respectively collect the output voltage of the battery access module and the charge-discharge module after the amplified voltage value of the op-amp module, and convert the voltage The value is output to the control module; the control module is used to control the switching of the switching control module; after the charging and discharging motor module is connected to the operational amplifier module, the closed-loop control is turned on for the output voltage of the charging and discharging motor, so that the charging and discharging motor The output voltage value of the battery rises to the preset voltage value of the closed-loop control, and the battery connection module is controlled to connect to the charging and discharging machine module to complete charging and discharging. In the present invention, the system for reducing the inrush current of lithium battery formation and capacity start-up ensures that the inrush current is minimized when the lithium battery is connected to the charge-discharge machine for charge-discharge start-up, so that the final performance of the lithium battery is more stable.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a system and a method for reducing formation and capacity-grading starting impact current of a lithium battery.
Background
At present, lithium battery formation and capacity grading adopt a single-battery-core formation scheme, that is, one battery core is charged and discharged by an independent power supply to realize activation of the lithium battery. In the process of formation and capacity grading, high-precision charge and discharge control and reduction of the appearance of impulse current play an extremely important role in the final quality characteristics of the lithium battery.
At the moment of starting a lithium battery formation and capacity-grading charge-discharge machine, the output voltage of the charge-discharge machine is required to be completely consistent with the input voltage of a battery at first, and then the battery is connected, so that charge-discharge control is performed. The purpose of doing so is in order to reduce the lithium cell and insert the moment, because with the inconsistent of charge-discharge machine output voltage and battery input voltage, lead to the lithium cell to receive starting current impact, damage the formation of lithium cell, partial volume quality, also harm the life-span of lithium cell simultaneously. Because the lithium battery formation and capacity grading system has very high requirements on charge and discharge current, in order to reduce the impact of the starting, when the battery is connected into the charge and discharge machine, the closer the output voltage of the charge and discharge machine is to be consistent with the input voltage of the battery, the smaller the impact current at the moment of connection theoretically is, and under the ideal condition, the voltage of the charge and discharge machine is completely consistent with that of the battery, so that the impact cannot be caused. However, due to the sampling deviation of the actual charging and discharging machine and the nonlinearity of the actual sampling circuit, even if the sampling circuit can be calibrated at a later stage, it is unlikely that the voltages of the two are completely consistent, and more or less starting impact current exists.
Disclosure of Invention
In view of at least one of the drawbacks and needs of the prior art, the present invention provides a system and a method for reducing inrush current during capacity start of lithium battery, which aims to reduce inrush current during capacity start of lithium battery.
To achieve the above object, according to one aspect of the present invention, there is provided a system for reducing a capacity start inrush current of a lithium battery, comprising: the system comprises an acquisition module, a switching control module, an operational amplifier module, a battery access module and a charge-discharge machine module;
the switching control module is used for switching the battery access module and the charging and discharging machine module to access the operational amplifier module in sequence;
the acquisition module is used for respectively acquiring voltage values of the output voltages of the battery access module and the charge and discharge machine module after being amplified by the operational amplifier module and outputting the voltage values to the control module;
the control module is used for controlling the switching of the switching control module; after the charging and discharging machine module is connected to the operational amplifier module, closed-loop control is started on the output voltage of the charging and discharging machine, the output voltage value of the charging and discharging machine is increased to a preset voltage value of the closed-loop control, and the battery access module is controlled to be connected to the charging and discharging machine module to complete charging and discharging starting.
Preferably, a voltage value of the output voltage of the battery access module after being amplified by the operational amplifier module is a preset voltage value of the closed-loop control.
Preferably, the first output side of the charging and discharging motor module is connected with the first output side of the battery access module through a switch circuit;
the control module controls the switch-on of the switch circuit to enable the battery access module to be connected into the charge and discharge machine module to achieve the charge and discharge starting of the battery.
Preferably, the second output side of the charge and discharge machine module is connected to a first resistance voltage-dividing circuit, and the first resistance voltage-dividing circuit divides the output voltage of the charge and discharge machine module and outputs a differential voltage to the operational amplifier module.
Preferably, a second output side of the battery access module is connected to a second resistance voltage divider circuit, and the second resistance voltage divider circuit divides the output voltage of the battery access module and outputs a differential voltage to the operational amplifier module.
Preferably, the voltage dividing effect of the first resistance voltage dividing circuit and the second resistance voltage dividing circuit is kept the same.
Preferably, the first resistor voltage-dividing circuit and the second voltage-dividing circuit respectively include a plurality of resistors connected in series, and the resistance value of each resistor in the first resistor voltage-dividing circuit is equal to the resistance value of each resistor in the second voltage-dividing circuit.
Preferably, the switching control module is an analog switch, and the analog switch respectively switches the battery access module and the charge and discharge machine module to access the operational amplifier module under the action of the control signal.
According to another aspect of the present invention, there is also provided a method for reducing the capacity-based starting inrush current of a lithium battery, comprising:
the battery access module is accessed to the operational amplifier module, and first output voltage stabilized by the operational amplifier module is collected and output to the control module;
disconnecting the battery access module and the operational amplifier module, switching a charge and discharge machine module to access the operational amplifier module, collecting a second output voltage after the operational amplifier module is stabilized, and outputting the second output voltage to a control module;
starting closed-loop control on the output voltage of the charging and discharging motor module to enable the voltage value of the output voltage to be equal to the first voltage value;
and controlling the battery access module to be connected into the charge and discharge machine module to complete charge and discharge starting.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) According to the system and the method for reducing the lithium battery formation capacity-based starting impact current, the sampling circuits of the output voltage of the charge and discharge machine module and the output voltage of the battery access module are set to be the same circuit, the switching control module is used for respectively switching and collecting the output voltages of the charge and discharge machine module and the battery access module, so that the inevitable collecting errors caused by the fact that different sampling circuits respectively collect the output voltages of the charge and discharge machine module and the battery access module are eliminated, and the impact current during starting is reduced.
(2) The invention provides a system and a method for reducing lithium battery formation capacity start-up impulse current, which take the output voltage of a charge-discharge machine acquired in real time as a feedback value of closed-loop control, and take the acquired output voltage of a battery access module as a given value of the closed-loop control to carry out closed-loop control on the charge-discharge machine module so as to enable the output voltage value of the charge-discharge machine module to be increased to be equal to the output voltage value of the battery access module, thereby completing charge-discharge start-up of a lithium battery.
Drawings
Fig. 1 is a schematic flow chart of reducing a capacity-based starting inrush current of a lithium battery according to an embodiment of the present invention;
fig. 2 is a schematic connection diagram of a charging and discharging machine module and a battery access module according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a first resistor divider circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second resistor divider circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a handover module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As introduced in the background art, before formation and capacity grading of a lithium battery, the lithium battery and a charge/discharge machine are connected to two sides of a switch circuit, when a formation and capacity grading program of the lithium battery is started, a system raises an output voltage Uc of the charge/discharge machine in the switch circuit to be consistent with an input lithium battery voltage Ubat, and then a switch K of the switch circuit is closed by control, so that the lithium battery is connected to the switch circuit, and high-precision charge/discharge control is performed on the lithium battery. However, if the voltage of the output filter capacitor of the switching circuit is inconsistent with the input voltage of the lithium battery when the switch K is closed, that is, there is a voltage difference, and due to a circuit law, the capacitor voltage cannot change suddenly, a large impulse current occurs at this time, according to kirchhoff's voltage law, at the instant of closing K, uc = I R + Ubat, that is, the impulse current acts on the resistor R to counteract the influence of the voltage difference, at this time, the amplitude of the impulse current is equal to (Uc-Ubat)/R, (Uc-Ubat), that is, the voltage difference at this time, since the internal resistance R of the lithium battery is very small, a very small voltage difference causes a large impulse current, thereby affecting the formation and capacitance separation quality of the lithium battery, and in order to obtain better formation and capacitance separation characteristics of the lithium battery, the voltage difference must be reduced as much as possible when the switch K is closed. The starting point of the invention is to collect the output voltage of the charge and discharge machine and the output voltage of the lithium battery of the switch circuit by using the same operational amplifier circuit, thereby reducing the influence of the collection circuit on the starting process.
The invention discloses a system for reducing formation capacity starting impact current, which is shown in a reference figure 1 and comprises: the system comprises an acquisition module, a switching control module, an operational amplifier module, a battery access module and a charge-discharge machine module; wherein,
the switching control module is used for switching the battery access module and the charging and discharging machine module to access the operational amplifier module in sequence;
the acquisition module is used for respectively acquiring voltage values of the output voltages of the battery access module and the charge and discharge machine module after being amplified by the operational amplifier module and outputting the voltage values to the control module;
the control module is used for controlling the switching of the switching control module; after the control switching module accesses the charging and discharging machine module to the operational amplifier module, closed-loop control is started on the output voltage of the charging and discharging machine, so that the output voltage value of the charging and discharging machine is increased to a preset voltage value of the closed-loop control, and the battery access module is accessed to the charging and discharging machine to complete starting.
Specifically, a first output end of the charging and discharging motor module is connected with a first output end of the battery access module through a switch circuit, and the control module controls the switch circuit to be switched on so that the battery access module is connected to the charging and discharging motor module to realize charging and discharging starting of the battery.
Through the connection relationship of the modules in fig. 1, the acquisition module can acquire the voltage of the battery input module and the output voltage of the charge and discharge machine module by using the same operational amplifier module, so that the sampling deviation caused by inconsistency brought by different operational amplifier circuits is reduced, the battery voltage with the original voltage deviation and the output voltage of the charge and discharge machine are mistakenly considered to be completely consistent, and the impact current when the actual battery is actually accessed is influenced.
As shown in fig. 2, which is a schematic diagram of a charging and discharging machine module and a battery access module provided in an embodiment, in this embodiment, a switch circuit is a DCDC circuit, the DCDC circuit includes an output switch K and a filter capacitor C connected in series, before lithium battery formation and capacity grading, a first output side of the battery access module may access one side of the output switch K, an acquisition module acquires an output voltage Ubat at two ends of the battery access module, the first output side of the charging and discharging machine module accesses one side of the filter capacitor C, and the acquisition module acquires an output voltage Uc at two ends of the filter capacitor C. When a lithium battery formation and capacity grading program is started, the control module raises the filter capacitor output voltage Uc of the DCDC circuit to be consistent with the voltage Ubat at two ends of the battery access module, and then the control module controls the output switch K to be closed, so that the battery access module is accessed into the DCDC circuit, and then high-precision charging and discharging control is carried out on the battery access module.
Specifically, the output switch K is a fully-controlled switching device, such as an IGBT or an MOS transistor.
Specifically, the second output side of the charge and discharge machine module is connected with a first resistance voltage division circuit, and the first resistance voltage division circuit divides the output voltage of the charge and discharge machine module and then outputs differential voltage to the operational amplifier module;
and the second output side of the battery access module is connected with a second resistance voltage division circuit, and the second resistance voltage division circuit divides the output voltage of the battery access module and outputs differential voltage to the operational amplifier module.
Preferably, in order to reduce differences caused by voltage division of the output voltages of the charge and discharge machine module and the battery access module by different resistance voltage division circuits, voltage errors acquired by the acquisition module are reduced, and voltage division effects of the first resistance voltage division circuit and the second resistance voltage division circuit are kept the same.
In a specific embodiment, as shown in fig. 3 and 4, the first voltage dividing circuit and the second voltage dividing circuit respectively include a plurality of resistors connected in series, and the resistance values of the resistors in the first voltage dividing circuit are equal to the resistance values of the resistors in the second voltage dividing circuit. Fig. 3 is a schematic diagram of a first resistor voltage-dividing circuit, where the first resistor voltage-dividing circuit includes a plurality of resistors R1 to R9 connected in series, and in order to ensure that the positive and negative input characteristic impedances of the differential circuit connected to the operational amplifier module are consistent, the resistances of R1 to R9 (except for R5) are equal to each other. Fig. 4 is a schematic diagram of a second resistance voltage-dividing circuit, where the second resistance voltage-dividing circuit includes a plurality of resistors R11 to R19 connected in series, and in order to ensure that the positive and negative input characteristic impedances of the differential circuit connected to the operational amplifier module are consistent, the resistances of R11 to R19 (except R15) are equal to each other.
In a specific embodiment, as shown in fig. 5, the switching control module is an analog switch, and the analog switch respectively switches the battery access module and the charging and discharging machine module to access the operational amplifier module under the action of the control signal, so that the output voltage of the battery access module and the output voltage of the charging and discharging machine module are respectively switched by the analog switch, output to the operational amplifier module for amplification, and then collected by the collection module.
In one embodiment, a method for reducing the capacity starting inrush current of the lithium battery composition is further provided, and the method comprises the following steps:
the battery access module is accessed into the operational amplifier module, and first output voltage stabilized by the operational amplifier module is collected and output to the control module;
disconnecting the battery access module from the operational amplifier module, switching the charge-discharge machine module to access the operational amplifier module, and collecting and outputting a second output voltage stabilized by the operational amplifier module to the control module;
starting closed-loop control on the output voltage of the charge and discharge machine module to enable the voltage value of the output voltage to be equal to the first voltage value;
and controlling the battery access module to be connected into the charge and discharge machine module to complete charge and discharge starting.
The invention provides a system and a method for reducing lithium battery formation capacity-sharing starting impact current.A sampling circuit of output voltage of a charge-discharge motor module and output voltage of a battery access module is set to be the same circuit, and the output voltage of the charge-discharge motor module and the output voltage of the battery access module are respectively switched and collected by a switching control module, so that inevitable collecting errors caused by respectively collecting the output voltages of the charge-discharge motor module and the battery access module by different sampling circuits are eliminated, and the impact current during starting is reduced; the method is characterized in that the output voltage of the charge and discharge machine collected in real time is used as a feedback value of closed-loop control, the collected output voltage of the battery access module is used as a given value of the closed-loop control, the closed-loop control is carried out on the charge and discharge machine module, so that the output voltage value of the charge and discharge machine module is increased to be equal to the output voltage value of the battery access module, the charge and discharge starting of the lithium battery is completed, the voltage of the charge and discharge machine module and the voltage of the battery access module can be controlled after being additionally calibrated during the closed-loop control, the output voltage of the charge and discharge machine and the output voltage of the battery are controlled at the same level when the battery is accessed, the impact current during starting is reduced to the maximum extent, and the method is simple and easy to accurately control.
It should be noted that for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts, but those skilled in the art should understand that the present application is not limited by the described order of acts, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some service interfaces, devices or units, and may be an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may also be implemented in the form of a software functional unit. The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable memory.
The above description is merely an exemplary embodiment of the present disclosure, and the scope of the present disclosure is not limited thereto. That is, all equivalent changes and modifications made in accordance with the teachings of the present disclosure are intended to be included within the scope of the present disclosure. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A system for reducing the capacity-based starting inrush current of lithium batteries, comprising: the device comprises an acquisition module, a switching control module, an operational amplifier module, a battery access module and a charge and discharge machine module;
the switching control module is used for switching the battery access module and the charging and discharging machine module to access the operational amplifier module in sequence;
the acquisition module is used for respectively acquiring voltage values of the output voltages of the battery access module and the charge and discharge machine module after being amplified by the operational amplifier module and outputting the voltage values to the control module;
the control module is used for controlling the switching of the switching control module; after the charging and discharging machine module is connected to the operational amplifier module, closed-loop control is started on the output voltage of the charging and discharging machine, so that the output voltage value of the charging and discharging machine is increased to a preset set value of the closed-loop control, and the battery access module is controlled to be connected to the charging and discharging machine module to complete charging and discharging starting.
2. The system for reducing the capacitive start-up inrush current of a lithium battery as claimed in claim 1, wherein the collected output voltage of the battery access module is used as a preset given value of the closed-loop control.
3. The system for reducing the capacitive starting inrush current of a lithium battery as claimed in claim 1, wherein the first output side of the charge and discharge motor module is connected to the first output side of the battery access module through a switching circuit;
the control module controls the conduction of the switch circuit to enable the battery access module to be connected into the charge and discharge machine module to achieve the charge and discharge starting of the battery.
4. The system for reducing the lithium battery formation capacity starting inrush current as claimed in claim 1, wherein a second output side of the charge and discharge machine module is connected to a first resistance voltage divider circuit, and the first resistance voltage divider circuit divides an output voltage of the charge and discharge machine module and outputs a differential voltage to the operational amplifier module.
5. The system for reducing the lithium battery formation capacity starting inrush current as claimed in claim 1, wherein a second output side of the battery access module is connected to a second resistance voltage divider circuit, and the second resistance voltage divider circuit divides an output voltage of the battery access module and outputs a differential voltage to the operational amplifier module.
6. The system for reducing the lithium battery formation capacity starting inrush current as claimed in claim 4 or 5, wherein the voltage dividing effect of the first resistance voltage dividing circuit and the second resistance voltage dividing circuit is kept the same.
7. The system of claim 6, wherein the first resistor voltage divider circuit and the second voltage divider circuit each comprise a plurality of resistors connected in series, and the resistance of each resistor in the first resistor voltage divider circuit is equal to the resistance of each resistor in the second voltage divider circuit.
8. The method for reducing the capacity-based starting inrush current of the lithium battery as claimed in claim 1, wherein the switching control module is an analog switch, and the analog switch switches the battery access module and the charge and discharge machine module to the operational amplifier module respectively under the action of the control signal.
9. A method for reducing the capacity starting impulse current of a lithium battery is characterized by comprising the following steps:
the battery access module is accessed to the operational amplifier module, and first output voltage stabilized by the operational amplifier module is collected and output to the control module;
disconnecting the battery access module from the operational amplifier module, switching a charge-discharge machine module to access the operational amplifier module, and collecting and outputting a second output voltage stabilized by the operational amplifier module to a control module;
starting closed-loop control on the output voltage of the charge and discharge machine module to enable the voltage value of the output voltage to be equal to the first output voltage value;
and controlling the battery access module to be connected into the charge and discharge machine module to complete charge and discharge starting.
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| CN113972702A (en) * | 2021-11-05 | 2022-01-25 | 锐捷网络股份有限公司 | Power supply device and power supply control method |
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