CN114977439A - Auxiliary power supply for series formation, series formation system and control method thereof - Google Patents

Auxiliary power supply for series formation, series formation system and control method thereof Download PDF

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Publication number
CN114977439A
CN114977439A CN202210802379.2A CN202210802379A CN114977439A CN 114977439 A CN114977439 A CN 114977439A CN 202210802379 A CN202210802379 A CN 202210802379A CN 114977439 A CN114977439 A CN 114977439A
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China
Prior art keywords
power supply
series
bat
battery
current
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CN202210802379.2A
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Chinese (zh)
Inventor
谢桢
唐郁滔
曾志永
石永华
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Dongguan Guangya Intelligent Technology Co ltd
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Dongguan Guangya Intelligent Technology Co ltd
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Priority to CN202210802379.2A priority Critical patent/CN114977439A/en
Publication of CN114977439A publication Critical patent/CN114977439A/en
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    • 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
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M10/44—Methods for charging or discharging
    • H01M10/446—Initial charging measures
    • 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
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses an auxiliary power supply for tandem formation, a tandem formation system and a control method thereof, relating to the technical field of power supplies for battery formation, wherein the auxiliary power supply comprises a plurality of auxiliary power supply modules and loop switching modules, wherein the auxiliary power supply modules and the loop switching modules are arranged according to the number of single batteries BAT in a tandem battery pack; each auxiliary power supply module is connected with one or a plurality of single batteries BAT in the series battery pack through a loop switching module. The invention mainly solves the problem of how to provide power supply compensation for each single battery on the basis of serial formation; this kind of serialization becomes uses auxiliary power supply, auxiliary power supply module can become the in-process in series and provide auxiliary electric energy for each battery cell BAT, and the circuit switching module can cut in or cut out the series connection that the serialization becomes with DC power supply and becomes the main circuit with battery cell BAT, has compensatied the difference between each battery cell BAT to make the power control of serialization formation in-process more nimble high-efficient.

Description

Auxiliary power supply for series formation, series formation system and control method thereof
Technical Field
The invention relates to the technical field of power supplies for battery formation, in particular to an auxiliary power supply for series formation, a series formation system and a control method thereof.
Background
With the development of electric automobiles and energy storage industries, lithium batteries with the advantages of high voltage, light weight, small volume, long service life, good safety, no pollution, low self-discharge rate, wide working temperature range and the like are widely applied; in the manufacturing process of the lithium battery, a formation procedure needs to be completed, that is, after the lithium battery is assembled, the lithium battery needs to be charged for a certain time by using certain voltage and current, and a series of chemical reactions occur inside the lithium battery through the steps of discharging and placing, so that the electric core of the lithium battery is activated, and the performance of the lithium battery reaches the standard.
The parallel formation technology is to divide each lithium battery into independent channels for formation, the current passing through each lithium battery cannot be ensured to be completely consistent, and the consistency of each lithium battery is difficult to ensure in the formation process due to the influence of the output precision of the formation equipment; in addition, the required current of the high-power lithium battery is large during formation, and the line loss and the internal resistance of the formation equipment consume large electric energy during parallel formation.
If all the lithium batteries are connected in series to be unified, all the lithium batteries connected in series can obtain the same current, and the consistency of all the lithium batteries in the formation process is better ensured; in addition, the serial formation mode can improve the port voltage of the formation loop and reduce the loss of electric energy on the internal resistance of the formation equipment.
In the series battery pack, a certain difference inevitably exists between the single batteries, in the series formation process, part of the single batteries may need to finish the formation process in advance, and other single batteries still need to continue the formation process; alternatively, in some sudden situations, if an abnormality occurs in a single cell, it is necessary to exit the formation loop in advance without affecting formation of other single cells.
In summary, how to provide a tandem formation power supply can provide power supply compensation for each single battery based on the tandem formation becomes a problem to be solved urgently.
Disclosure of Invention
An object of the present invention is to provide an auxiliary power supply for tandem formation, which can compensate current for a single battery or bypass the single battery.
Another object of the present invention is to provide a tandem formation system, which can provide current compensation for each cell or bypass a specific cell based on tandem formation.
It is still another object of the present invention to provide a method for controlling a tandem formation system, which can compensate current for each cell or bypass a specific cell in each process of tandem formation.
In order to achieve the purpose, the invention provides the following technical scheme: an auxiliary power supply for series formation is matched with a direct-current power supply for series formation for use and is used for assisting in completing the series formation process of a series battery pack; the system comprises a plurality of auxiliary power modules and a loop switching module, wherein the auxiliary power modules and the loop switching module are arranged according to the number of single batteries BAT in the series battery pack; and each auxiliary power supply module is respectively connected with one or a plurality of single batteries BAT in the series battery pack through one loop switching module.
In the above technical solution, the auxiliary power supply module is a dc conversion module.
In the above technical solution, each auxiliary power supply module includes a switching tube Q1, a switching tube Q2, a transformer T, a diode D1, a diode D2, and an output filter capacitor C2; the switching tube Q1, the switching tube Q2, the transformer T, the diode D1, the diode D2 and the output filter capacitor C2 are connected to form a half-bridge circuit structure.
In the above technical solution, the auxiliary power supply module further includes a resonant inductor L and a resonant capacitor C1; the resonant inductor L and the resonant capacitor C1 are connected in series to the primary side of the transformer T, respectively.
In the above technical solution, the auxiliary power supply module further includes a switching tube Q3 and a switching tube Q4; the switching tube Q3 and the switching tube Q4 are respectively connected in series with two poles of the output end of the output filter capacitor C2.
In the above technical solution, each loop switching module includes a connecting bus WB, a switch tube S1, and a switch tube S2; the connecting buses WB of the loop switching modules are connected end to end, the connecting bus WB of the first loop switching module is connected to one pole of the series-connection formation direct-current power supply, and the connecting bus WB of the last loop switching module is connected to the other pole of the series-connection formation direct-current power supply; in each loop switching module, the switching tube S2 is connected in series to the connecting bus WB, the switching tube S1 is connected in series with one or more single batteries BAT in the series battery pack, and the switching tube S1 and the single batteries BAT after series connection are connected in parallel to the connecting bus WB according to polarity; and the output end of the auxiliary power supply module is connected in parallel to the connecting bus WB according to polarity.
In the above technical solution, when the switching tube S1 is turned on and the switching tube S2 is turned off: current can pass through the switching tube S1 and the battery cell BAT in order from the connecting bus WB; alternatively, the current can sequentially pass through the battery cell BAT and the switching tube S1 from the connecting bus WB; when the switch tube S1 is turned off and the switch tube S2 is turned on: the switching tube S1 and the battery cell BAT are bypassed, and a current can pass through the connecting bus WB and the switching tube S2.
A series formation system comprises the auxiliary power supply for series formation, and further comprises: the main control is respectively in signal connection with the DC power supply for the serial formation, the sampling module and the switch tube driving module; the main control can respectively control the auxiliary power supply module and the loop switching module through the switch tube driving module; the main switching power supply is used for converting alternating current commercial power into direct current suitable for the series-connection direct current power supply and each auxiliary power supply module to use, and the input end of the series-connection direct current power supply and the input end of each auxiliary power supply module are respectively connected with the output end of the main switching power supply; each single battery BAT in the series battery pack is respectively connected to the output end of the series formation direct current power supply in a polarity-dependent manner through the loop switching module; the sampling module can at least sample the voltage at two ends of each single battery BAT, the output current of the series-connection formation direct-current power supply and the output current of each auxiliary power supply module, and the voltage is transmitted to the master control.
In the above technical solution, each loop switching module includes a connecting bus WB, a switching tube S1, and a switching tube S2; the connecting buses WB of the loop switching modules are connected end to end, the connecting bus WB of the first loop switching module is connected to one pole of the series-connection formation direct-current power supply, and the connecting bus WB of the last loop switching module is connected to the other pole of the series-connection formation direct-current power supply; in each loop switching module, the switching tube S2 is connected in series to the connecting bus WB, the switching tube S1 is connected in series with one or more single batteries BAT in the series battery pack, and the switching tube S1 and the single batteries BAT after series connection are connected in parallel to the connecting bus WB according to polarity; and the output end of the auxiliary power supply module is connected in parallel on the connecting bus WB according to the polarity.
A method of controlling a tandem formation system, comprising:
according to the requirements of series formation process of single batteries BAT, the voltage V of the charging constant voltage point is preset respectively ref1 Constant voltage point voltage V of discharge ref2 Charging current set value I ref1 And a discharge current set value I ref2 ；
In the constant current charging step, there are:
according to the charging current set value I ref1 To control the DC power supply for the series formation,providing a constant first main current I for a series battery m1 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat Whenever there is a battery voltage V of the battery cell BAT bat When the charging target voltage is reached, bypassing the single battery BAT through a loop switching module;
when the constant-current charging process is shifted to the constant-voltage charging process, the following steps are performed:
according to the charging current set value I ref1 To control the DC power supply for series formation and provide a first main current I for the series battery pack m1 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat (ii) a The voltage V of the battery bat To the charging constant voltage point voltage V ref1 The first battery cell BAT is marked as a first constant voltage identification battery, and the first main current I output by the direct current power supply for the series formation is reduced m1 A constant voltage charging unit for charging the battery cell BAT marked as a first constant voltage identification battery with the dc power supply for the serial formation; for the single battery BAT which is not marked as the first constant voltage identification battery, the auxiliary power supply module is used for providing the first compensation current I for the single battery BAT s1 And a first main current I is caused to flow m1 + a first compensation current I s1 Set value of charging current I ref1 Up to the battery voltage V of the battery cell BAT bat To the charging constant voltage point voltage V ref1 Then, the auxiliary power supply module is used for supplying the battery voltage V to the battery bat Is maintained as a charging constant voltage point voltage V ref1 Making the battery cell BAT enter a constant voltage charging process;
in the constant current discharge step, there are:
according to the discharge current set value I ref2 To control the DC power supply for series formation and provide a constant second main current I for the series battery m2 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat Whenever there is a battery voltage V of the battery cell BAT bat When the discharging target voltage is reached, bypassing the single battery BAT through the loop switching module;
when the constant current discharge process is shifted to the constant voltage discharge process, the following processes are provided:
according to the discharge current set value I ref2 To control the DC power supply for series formation and provide a second main current I for the series battery m2 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat (ii) a Using auxiliary power supply module for battery voltage V bat To the discharge constant voltage point voltage V ref2 The battery cell BAT provides a second compensation current I s2 To adjust the battery voltage V bat Maintaining as a discharge constant voltage point voltage V ref2 (ii) a Will last reach the discharge constant voltage point voltage V ref2 The battery cell BAT is marked as a second constant voltage identification battery, and in the main circuit provided by the DC power supply for the series formation, the battery voltage V of the battery cell BAT marked as the second constant voltage identification battery bat Maintaining as a discharge constant voltage point voltage V ref2 ；
At any time, the selected one or more unit batteries BAT can be bypassed by the loop switching module.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the auxiliary power supply for the series formation, the auxiliary power supply module can provide compensation current for the single batteries BAT in the series formation process, and the difference between the single batteries BAT is compensated; the circuit switching module can switch the single battery BAT into or out of the series connection to form a main circuit by series connection provided by the direct current power supply, free single battery circuit switching control is provided, and power supply control in the series connection forming process is flexible and efficient.
2. According to the series formation system, the auxiliary power supply module and the loop switching module are additionally arranged on the basis of the direct-current power supply for series formation, and the constant-voltage charging and discharging process of a single battery BAT can be realized on the basis of the series formation process by controlling the operation of the auxiliary power supply module, so that the flexibility of the series formation process is improved; and the small current compensation of the auxiliary power supply module can effectively reduce the electric energy loss of the series formation system in the series formation process.
3. According to the control method of the series formation system, the auxiliary power supply module can provide compensation current for the single battery BAT, so that a constant-voltage charging and discharging process of the single battery BAT is realized on the basis of the series formation process, a new control mode is provided for the series formation process, the difference among the single batteries BAT is compensated, and the electric energy loss of the series formation system is reduced; and, the use of the loop switching module can provide free cell loop switching control.
Drawings
Fig. 1 is a schematic circuit diagram according to a first embodiment of the present invention.
Fig. 2 is a system configuration view of a second embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment provides an auxiliary power supply for series formation, which is matched with a direct-current power supply for series formation to be used for assisting in completing the series formation process of a series battery pack.
The series battery pack is a battery pack formed by connecting a plurality of assembled single batteries BAT in series according to polarity; the direct current power supply for the series formation is a DC-DC converter and is used for providing a main series formation circuit which can obtain electric energy from a direct current bus and provide direct current electric energy suitable for the series formation process.
Referring to fig. 1, the auxiliary power supply for tandem formation includes a plurality of auxiliary power supply modules and a circuit switching module, which are arranged according to the number of battery cells BAT in a battery pack in series; each auxiliary power supply module is connected with one or a plurality of single batteries BAT in the series battery pack through a loop switching module.
That is, the number of the auxiliary power modules and the number of the loop switching modules are the same and are provided with a plurality of auxiliary power modules and loop switching modules, one auxiliary power module and one loop switching module can be correspondingly arranged on each single battery BAT, and one auxiliary power module and one loop switching module can also be correspondingly arranged on the plurality of single batteries BAT after being connected in series.
Specifically, the auxiliary power module is a dc conversion module, and the auxiliary power module can obtain electric energy from a dc bus and provide dc electric energy suitable for use in an auxiliary series formation process.
Further specifically, each auxiliary power supply module comprises a switching tube Q1, a switching tube Q2, a transformer T, a diode D1, a diode D2 and an output filter capacitor C2; the switching tube Q1 and the switching tube Q2 may be Power field effect transistors (Power MOSFETs) or Insulated Gate Bipolar Transistors (IGBTs), and actually, it is necessary to ensure that the switching tube Q1 and the switching tube Q2 have a full control function; the transformer T is a high-frequency electronic transformer and is provided with a center tap; the switch tube Q1, the switch tube Q2, the transformer T, the diode D1, the diode D2 and the output filter capacitor C2 are connected to form a half-bridge circuit structure, specifically, the switch tube Q1 and the switch tube Q2 are disposed on the primary side of the transformer T for controlling the on and off time of the auxiliary power module, the diode D1 and the diode D2 are disposed on the secondary side of the transformer T for outputting a follow current, and the output filter capacitor C2 is connected in parallel to the secondary side of the transformer T for filtering and serving as an output end of the auxiliary power module.
The auxiliary power supply module takes the free ends of a switch tube Q1 and a switch tube Q2 as two poles of an input end, takes two ends of an output filter capacitor C2 as two poles of an output end, and can output direct current with stable voltage and current at the output end under the follow current action of a diode D1 and a diode D2 after variable direct current is introduced to the input end, and a transformer T is used for preventing the input end and the output end of the auxiliary power supply module from being directly communicated, namely, the transformer T has the functions of voltage transformation and energy conversion and isolation; the auxiliary power supply module can control the output voltage by controlling the on-off time ratio of the switch tube Q1 and the switch tube Q2.
Further, the auxiliary power module further includes a resonant inductor L and a resonant capacitor C1, where the resonant inductor L and the resonant capacitor C1 are respectively connected in series to the primary side of the transformer T, so that the resonant inductor L, the resonant capacitor C1, and the leakage inductance of the transformer T form a resonant cavity at the input end of the auxiliary power module.
Further, the auxiliary power supply module further comprises a switching tube Q3 and a switching tube Q4; the switching tube Q3 and the switching tube Q4 may be Power field effect transistors (Power MOSFETs) or Insulated Gate Bipolar Transistors (IGBTs), and actually, the switching tube Q3 and the switching tube Q4 have a full control function and can be controlled to be turned on and off by a common driving level; the switch tube Q3 and the switch tube Q4 are respectively connected in series with two poles of the output end of the output filter capacitor C2; two poles of the output end of the output filter capacitor C2 are provided with a switch tube Q3 and a switch tube Q4, when the auxiliary power supply module works, the switch tube Q3 and the switch tube Q4 are both kept on to ensure the normal connection of the auxiliary power supply module and the single battery BAT, and when the auxiliary power supply module does not work or finishes working, the switch tube Q3 and the switch tube Q4 are both kept off to avoid introducing an additional capacitive element or inductive element into a loop of the direct current power supply for series connection, so that the direct current power supply for series connection can run stably.
Specifically, each loop switching module includes a connecting bus WB, a switching tube S1 and a switching tube S2; the connecting bus WB is a direct-current connector, a direct-current copper bar or a connecting terminal, and can even be a section of conductor; the switch tube S1 and the switch tube S2 may be Power field effect transistors (Power MOSFETs) or Insulated Gate Bipolar Transistors (IGBTs), and actually, the switch tube S1 and the switch tube S2 have a full control function and can be controlled to be turned on and off by a common driving level; the connecting buses WB of the loop switching modules are connected end to end, the connecting bus WB of the first loop switching module is connected with one pole of the direct-current power supply for serial formation, and the connecting bus WB of the last loop switching module is connected with the other pole of the direct-current power supply for serial formation, so that the connecting buses WB of the loop switching modules are connected in series into the main circuit of the serial formation provided by the direct-current power supply for serial formation; in each loop switching module, a switching tube S2 is connected in series on a connecting bus WB, a switching tube S1 is connected in series with one or a plurality of single batteries BAT in a series battery pack, and the switching tube S1 and the single batteries BAT which are connected in series are connected in parallel on the connecting bus WB according to the polarity; the output end of the auxiliary power supply module is connected in parallel to the connecting bus WB according to polarity, so that the auxiliary power supply module can provide auxiliary electric energy for the connecting bus WB.
Further, a safety FU can be added to the loop of the switch tube S1 and the battery cell BAT to protect the switch tube S1 and the battery cell BAT.
When the switch tube S1 is turned on and the switch tube S2 is turned off:
the current can sequentially pass through the switching tube S1 and the single battery BAT from the connecting bus WB; alternatively, the current can pass from the connecting bus bar WB to the cell BAT and the switching tube S1 in this order.
The current can be provided by a direct current power supply for series formation; the discharging current of the single battery BAT can be provided by a direct current power supply and an auxiliary power supply module which are connected in series; in the above process, the current can flow through the battery cell BAT in the forward direction to charge the battery cell BAT; alternatively, the current may flow in the reverse direction through the unit battery BAT as the discharge current of the unit battery BAT.
When the switch tube S1 is turned off and the switch tube S2 is turned on:
the switching tube S1 and the battery cell BAT are bypassed, and current can pass through the connecting bus WB and the switching tube S2.
At this time, the circuit formed by the switching tube S1 and the battery cell BAT is bypassed from the series main circuit provided by the dc power supply for series formation, and the switching tube S2 and the connecting bus WB can serve as conductors in the series main circuit provided by the dc power supply for series formation, and do not affect the operation of other parts in the series main circuit.
According to the auxiliary power supply for the series formation, the auxiliary power supply module can provide compensation current for the single batteries BAT in the series formation process, and the difference between the single batteries BAT is compensated; the circuit switching module can switch the single battery BAT into or out of the series connection to form a main circuit by series connection provided by the direct current power supply, free single battery circuit switching control is provided, and power supply control in the series connection forming process is flexible and efficient.
Example two:
referring to fig. 2, the present embodiment provides a tandem formation system including the auxiliary power supply for tandem formation in the first embodiment.
The series formation system further comprises a main control unit, a main switch power supply, a direct current power supply for series formation, a sampling module and a switch tube driving module.
The master control unit is an MCU such as a singlechip, an embedded chip, a Programmable Logic Controller (PLC) and an industrial personal computer, and is at least provided with a universal input/output interface, a serial communication interface and a PWM output interface; the main switching power supply is a general switching power supply module, and the direct-current power supply for series formation is a DC-DC converter and is used for providing a main circuit for series formation; the switch tube driving module is a PWM driving module, and can drive switch tubes such as a Power field effect Transistor (Power MOSFET) and an Insulated Gate Bipolar Transistor (IGBT) to operate through PWM signals.
The main switching power supply is used for converting alternating current commercial power into direct current suitable for being connected in series into a direct current power supply and each auxiliary power supply module, and the input end of the direct current power supply for series formation and the input end of each auxiliary power supply module are respectively connected with the output end of the main switching power supply; namely, the output end of the main switching power supply provides a direct current bus, and the input end of the direct current power supply for series formation and the input end of each auxiliary power supply module are respectively connected into the direct current bus according to the polarity, so that direct current is obtained.
Each single battery BAT in the series battery pack is respectively connected to the output end of the series formation direct current power supply according to the polarity through the loop switching module; specifically, each loop switching module includes a connecting bus WB, a switching tube S1 and a switching tube S2; the connecting bus WB is a direct-current connector, a direct-current copper bar or a connecting terminal, and can even be a section of conductor; the switch tube S1 and the switch tube S2 may be Power field effect transistors (Power MOSFETs) or Insulated Gate Bipolar Transistors (IGBTs), and actually, the switch tube S1 and the switch tube S2 have a full control function and can be controlled to be turned on and off by a common driving level; the connecting buses WB of the loop switching modules are connected end to end, the connecting bus WB of the first loop switching module is connected with one pole of the direct-current power supply for serial formation, and the connecting bus WB of the last loop switching module is connected with the other pole of the direct-current power supply for serial formation, so that the connecting buses WB of the loop switching modules are connected in series into the main circuit of the serial formation provided by the direct-current power supply for serial formation; in each loop switching module, a switching tube S2 is connected in series on a connecting bus WB, a switching tube S1 is connected in series with one or a plurality of single batteries BAT in a series battery pack, and the switching tube S1 and the single batteries BAT which are connected in series are connected in parallel on the connecting bus WB according to the polarity; the output end of the auxiliary power supply module is connected in parallel to the connecting bus WB according to polarity, so that the auxiliary power supply module can provide auxiliary electric energy for the connecting bus WB.
The main control is respectively in signal connection with the series formation direct current power supply, the sampling module and the switching tube driving module, specifically, a serial communication interface or a PWM output interface of the main control is connected with a control port of the series formation direct current power supply so as to control the output voltage and the output current of the series formation direct current power supply, and a PWM output interface of the main control is connected with a PWM input interface of the switching tube driving module.
The main control can respectively control the auxiliary power supply module and the loop switching module through the switching tube driving module; specifically, the PWM output interfaces of the switching tube driving module are respectively connected to the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 in each auxiliary power supply module, and the PWM output interfaces of the switching tube driving module are respectively connected to the switching tube S1 and the switching tube S2 in each loop switching module; the main control controls whether the PWM output interface of the switching tube driving module outputs a PWM signal or not and controls the duty ratio of the PWM signal, so that the on-off time of the switching tube Q1 and the switching tube Q2 is controlled, and the output voltage and the output current of the auxiliary power supply module are further controlled; the on-off of the switch tube Q3 and the switch tube Q4 can be controlled, and whether the auxiliary power supply module works or not is further controlled; and the on-off of the switch tube S1 and the switch tube S2 can be controlled, and further whether the single battery BAT is connected in series to form a main circuit or not is controlled.
The sampling module can at least sample the voltage at two ends of each single battery BAT, the output current of the direct current power supply for series formation and the output current of each auxiliary power supply module, and the output currents are transmitted to the master control; in this embodiment, the sampling module includes a plurality of analog-to-digital converters, such as an AD7616 chip, and further includes a plurality of amplifier-based voltage sampling circuits arranged according to the number of the battery cells BAT, input terminals of the voltage sampling circuits are connected in parallel to two ends of each battery cell BAT, and are used for sampling voltages at two ends of each battery cell BAT, output terminals of the voltage sampling circuits are respectively connected to analog input terminals of the plurality of analog-to-digital converters, and further, sampling points are respectively established at output terminals of the dc power supply for series formation and each auxiliary power supply module by the sampling module, so as to sample output currents of the dc power supply for series formation and output currents of each auxiliary power supply module, and output terminals of the sampling points are respectively connected to analog input terminals of the plurality of analog-to-digital converters; the serial communication interface of the multi-channel analog-digital converter is connected with the serial communication interface of the master control, and the voltage at two ends of each single battery BAT, the output current of the direct current power supply for the series connection formation and the output current of each auxiliary power supply module are transmitted to the master control in a serial communication mode, so that the closed-loop control of the series connection formation system is realized.
According to the series formation system, the auxiliary power supply module and the loop switching module are additionally arranged on the basis of the direct-current power supply for series formation, and the constant-voltage charging and discharging process of a single battery BAT can be realized on the basis of the series formation process by controlling the operation of the auxiliary power supply module, so that the flexibility of the series formation process is improved; and the small current compensation of the auxiliary power supply module can effectively reduce the electric energy loss of the series formation system in the series formation process.
Example three:
the present embodiment provides a control method for a series formation system, which can be applied to the series formation system of the second embodiment to complete a series formation process of a series battery pack.
The control method of the series formation system comprises the following steps:
according to the requirements of series formation process of single batteries BAT, the voltage V of the charging constant voltage point is preset respectively ref1 Constant voltage point voltage V of discharge ref2 Charging current set value I ref1 And a discharge current set value I ref2 。
Wherein, the charging constant voltage point voltage V ref1 Discharge constant voltage point voltage V ref2 Charging current set value I ref1 And a discharge current set value I ref2 Are preset according to the properties of the battery BAT and the requirements of the series formation process, and are used as process node marks for charging the constant voltage point voltage V ref1 Constant voltage point voltage V of discharge ref2 Charging current set value I ref1 And a discharge current set value I ref2 Stored in the memory of the master.
In the constant current charging step, there are:
according to the set value I of the charging current ref1 To control the DC power supply for series formation and provide a constant first main current I for the series battery m1 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat Whenever there is a battery voltage V of the battery cell BAT bat And when the target charging voltage is reached, bypassing the single battery BAT through the loop switching module.
The above-mentioned battery voltage V bat And the sampling module samples and transmits the samples to the master control to realize real-time detection.
In the process, the auxiliary power supply module does not work, and the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 are all in an off state; at the beginning, the switch tubes S1 of all the loop switching modules are switched on, the switch tube S2 is switched off, at this time, all the single batteries BAT are connected in series to the series formation main circuit provided by the series formation DC power supply to form a series battery pack,by a first main current I m1 To complete the constant current charging process; battery voltage V with battery cell BAT bat When the target charging voltage is reached, the switching tube S1 of the loop switching module in which the battery cell BAT is located is turned off, and the switching tube S2 is turned on, so as to bypass the battery cell BAT.
When the constant-current charging process is switched to the constant-voltage charging process, the following steps are performed:
according to the set value I of the charging current ref1 To control the DC power supply for series formation and provide a first main current I for the series battery pack m1 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat (ii) a The voltage V of the battery bat Voltage V reaching constant voltage point of charging ref1 The first battery BAT is marked as a first constant voltage identification battery, and the first main current I output by the direct current power supply for the series formation is reduced m1 Performing constant-voltage charging on a single battery BAT marked as a first constant-voltage identification battery by using a direct-current power supply for series formation; for the single battery BAT which is not marked as the first constant voltage identification battery, the auxiliary power supply module is used for providing the first compensation current I for the single battery BAT s1 And a first main current I is caused to flow m1 + a first compensation current I s1 Set value of charging current I ref1 Up to the battery voltage V of the battery cell BAT bat Voltage V reaching constant voltage point of charging ref1 Then, the auxiliary power supply module is used for converting the battery voltage V bat Is maintained as a charging constant voltage point voltage V ref1 The cell BAT is subjected to a constant voltage charging process.
In this step, the main controller directly controls the output current (first main current I) of the series-connected DC power supply m1 ) Voltage of battery V bat Voltage V not reaching the constant voltage point of charging ref1 The auxiliary power module corresponding to the battery cell BAT starts to work, the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 are switched to the on state, and the main control controls the output current (the first compensation current I) of the auxiliary power module through the switching tube driving module s1 ) (ii) a In this process, the main circuit current of the dc power supply to be connected in series and the output current of each auxiliary power supply module are both reducedWhen the time reaches zero, the process ends.
In the constant current discharge step, there are:
according to the discharge current set value I ref2 To control the DC power supply for series formation and provide a constant second main current I for the series battery m2 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat Whenever there is a battery voltage V of the battery cell BAT bat And when the discharging target voltage is reached, bypassing the single battery BAT through the loop switching module.
The second main current I m2 The discharge current of the series battery pack may be combined with the dc power supply for series formation, or may be only the discharge current of the series battery pack.
In the working procedure, the auxiliary power supply module does not work, and the switching tube Q1, the switching tube Q2, the switching tube Q3 and the switching tube Q4 are all in an off state; at the beginning, the switch tubes S1 of all the loop switching modules are turned on, the switch tube S2 is turned off, at this time, all the battery cells BAT are connected in series to the series formation main circuit provided by the series formation direct current power supply to form a series battery pack, and the second main current I is passed through m2 To complete the constant current discharge process; battery voltage V with battery cell BAT bat When the target discharge voltage is reached, the switching tube S1 of the circuit switching module in which the battery cell BAT is located is turned off, and the switching tube S2 is turned on, so that the battery cell BAT is bypassed.
When the constant current discharge process is shifted to the constant voltage discharge process, the following processes are provided:
according to the discharge current set value I ref2 To control the DC power supply for series formation and provide a second main current I for the series battery m2 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat (ii) a Using auxiliary power supply module for battery voltage V bat Voltage V reaching constant voltage point of discharge ref2 The battery cell BAT provides a second compensation current I s2 To adjust the battery voltage V bat Maintaining as a discharge constant voltage point voltage V ref2 (ii) a The last voltage V reaching the discharge constant voltage point ref2 BAT mark of single batteryA battery voltage V of a battery cell BAT marked as a second constant voltage marked battery and serially connected to a main circuit provided by a DC power supply bat Maintaining as a discharge constant voltage point voltage V ref2 。
In this step, the main controller directly controls the output current of the series-connected DC power supply (second main current I) m2 ) Voltage of battery V bat Voltage V reaching constant voltage point of discharge ref2 The auxiliary power module corresponding to the battery cell BAT starts to work, the switch tube Q1, the switch tube Q2, the switch tube Q3 and the switch tube Q4 are switched to the on state, and the main control controls the output current (the second compensation current I) of the auxiliary power module through the switch tube driving module s2 ) (ii) a In this process, the process is completed when the main circuit current of the dc power supply for series formation and the output current of each auxiliary power supply module are both reduced to near zero.
At any time, the selected one or more unit batteries BAT can be bypassed by the loop switching module.
That is, when the switching tube S1 is turned on and the switching tube S2 is turned off: the current can sequentially pass through the switching tube S1 and the single battery BAT from the connecting bus WB; alternatively, the current can pass through the cell BAT and the switching tube S1 in order from the connecting bus WB; when the switch tube S1 is turned off and the switch tube S2 is turned on: the switching tube S1 and the battery cell BAT are bypassed, and current can pass through the connecting bus WB and the switching tube S2.
In the process, the auxiliary power supply module only needs to work in the forward direction and does not need to work in the two-way direction no matter in the constant voltage process or the constant current process, namely, the electric energy only needs to be transmitted to the single battery BAT from the direct current bus through the auxiliary power supply module, and the auxiliary power supply module does not need to undertake electric energy feedback work.
According to the control method of the series formation system, the auxiliary power supply module can provide compensation current for the single battery BAT, so that a constant-voltage charging and discharging process of the single battery BAT is realized on the basis of the series formation process, a new control mode is provided for the series formation process, the difference among the single batteries BAT is compensated, and the electric energy loss of the series formation system is reduced; and, the use of the loop switching module can provide free cell loop switching control.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. An auxiliary power supply for series formation is matched with a direct-current power supply for series formation for use and is used for assisting in completing the series formation process of a series battery pack; it is characterized in that the preparation method is characterized in that,
the system comprises a plurality of auxiliary power modules and a loop switching module, wherein the auxiliary power modules and the loop switching module are arranged according to the number of single batteries BAT in the series battery pack;
and each auxiliary power supply module is respectively connected with one or a plurality of single batteries BAT in the series battery pack through one loop switching module.
2. The auxiliary power supply for tandem formation according to claim 1, wherein the auxiliary power supply module is a dc conversion module.
3. The auxiliary power supply for series formation of claim 1 or 2, wherein each auxiliary power supply module comprises a switching tube Q1, a switching tube Q2, a transformer T, a diode D1, a diode D2 and an output filter capacitor C2;
the switching tube Q1, the switching tube Q2, the transformer T, the diode D1, the diode D2 and the output filter capacitor C2 are connected to form a half-bridge circuit structure.
4. The auxiliary power supply for tandem formation according to claim 3, wherein the auxiliary power supply module further comprises a resonant inductor L and a resonant capacitor C1;
the resonant inductor L and the resonant capacitor C1 are connected in series to the primary side of the transformer T, respectively.
5. The auxiliary power supply for tandem formation according to claim 3, wherein the auxiliary power supply module further comprises a switching tube Q3 and a switching tube Q4;
the switching tube Q3 and the switching tube Q4 are respectively connected in series with two poles of the output end of the output filter capacitor C2.
6. The auxiliary power supply for tandem formation according to claim 1, wherein each of the loop switching modules includes a connection bus WB, a switching tube S1 and a switching tube S2;
the connecting buses WB of the loop switching modules are connected end to end, the connecting bus WB of the first loop switching module is connected to one pole of the series-connection formation direct-current power supply, and the connecting bus WB of the last loop switching module is connected to the other pole of the series-connection formation direct-current power supply;
in each loop switching module, the switching tube S2 is connected in series to the connecting bus WB, the switching tube S1 is connected in series with one or more single batteries BAT in the series battery pack, and the switching tube S1 and the single batteries BAT after series connection are connected in parallel to the connecting bus WB according to polarity;
and the output end of the auxiliary power supply module is connected in parallel on the connecting bus WB according to the polarity.
7. The auxiliary power supply for tandem formation according to claim 6, wherein when the switching tube S1 is turned on and the switching tube S2 is turned off:
current can pass through the switching tube S1 and the battery cell BAT in order from the connecting bus WB; alternatively, the current can sequentially pass through the battery cell BAT and the switching tube S1 from the connecting bus WB;
when the switch tube S1 is turned off and the switch tube S2 is turned on:
the switching tube S1 and the battery cell BAT are bypassed, and current can pass through the connecting bus WB and the switching tube S2.
8. A tandem formation system comprising the auxiliary power supply for tandem formation according to any one of claims 1 to 7, further comprising:
the main control is respectively in signal connection with the direct current power supply for the serial formation, the sampling module and the switch tube driving module;
the main control can respectively control the auxiliary power supply module and the loop switching module through the switch tube driving module;
the main switching power supply is used for converting alternating current commercial power into direct current suitable for the series-connection direct current power supply and each auxiliary power supply module to use, and the input end of the series-connection direct current power supply and the input end of each auxiliary power supply module are respectively connected with the output end of the main switching power supply;
each single battery BAT in the series battery pack is respectively connected to the output end of the series formation direct current power supply in a polarity-dependent manner through the loop switching module;
the sampling module can at least sample the voltage at two ends of each single battery BAT, the output current of the series-connection formation direct-current power supply and the output current of each auxiliary power supply module, and the voltage is transmitted to the master control.
9. The tandem forming system according to claim 8, wherein each of the loop switching modules comprises a connecting bus WB, a switching tube S1 and a switching tube S2;
the connecting buses WB of the loop switching modules are connected end to end, the connecting bus WB of the first loop switching module is connected with one pole of the direct-current power supply for the serial formation, and the connecting bus WB of the last loop switching module is connected with the other pole of the direct-current power supply for the serial formation;
in each loop switching module, the switch tube S2 is connected in series to the connecting bus WB, the switch tube S1 is connected in series with one or more single batteries BAT in the series battery pack, and the switch tube S1 and the single batteries BAT after series connection are connected in parallel to the connecting bus WB according to polarity;
and the output end of the auxiliary power supply module is connected in parallel on the connecting bus WB according to the polarity.
10. A control method of a tandem formation system is characterized by comprising the following steps:
according to the requirements of series formation process of single batteries BAT, the voltage V of the charging constant voltage point is preset respectively ref1 Constant voltage point voltage V of discharge ref2 Charging current set value I ref1 And a discharge current set value I ref2 ；
In the constant current charging step, there are:
according to the charging current set value I ref1 To control the DC power supply for series formation and provide a constant first main current I for the series battery m1 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat Whenever there is a battery voltage V of the battery cell BAT bat When the charging target voltage is reached, bypassing the single battery BAT through the loop switching module;
when the constant-current charging process is shifted to the constant-voltage charging process, the following steps are performed:
according to the set value I of the charging current ref1 To control the DC power supply for series formation and provide a first main current I for the series battery pack m1 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat (ii) a The voltage V of the battery bat To the charging constant voltage point voltage V ref1 The first battery cell BAT is marked as a first constant voltage identification battery, and the first main current I output by the direct current power supply for the series formation is reduced m1 Performing constant voltage charging on the battery cell BAT marked as a first constant voltage identification battery using the series formation direct-current power supply; for the single battery BAT which is not marked as the first constant voltage identification battery, the auxiliary power supply module is used for providing the first complement for the single battery BATCompensated current I s1 And a first main current I is caused to flow m1 + a first compensation current I s1 Set value of charging current I ref1 Up to the battery voltage V of the battery cell BAT bat To the charging constant voltage point voltage V ref1 Then, the auxiliary power supply module is used for converting the battery voltage V bat Is maintained as a charging constant voltage point voltage V ref1 Making the battery cell BAT enter a constant voltage charging process;
in the constant current discharge step, there are:
according to the discharge current set value I ref2 To control the DC power supply for series formation and provide a constant second main current I for the series battery m2 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat Whenever there is a battery voltage V of the battery cell BAT bat When the discharging target voltage is reached, bypassing the single battery BAT through the loop switching module;
when the constant current discharge process is shifted to the constant voltage discharge process, the following processes are provided:
according to the discharge current set value I ref2 To control the DC power supply for series formation and provide a second main current I for the series battery m2 And detecting the battery voltage V of each single battery BAT in the series battery pack in real time bat (ii) a Using auxiliary power supply module for battery voltage V bat To the discharge constant voltage point voltage V ref2 The battery cell BAT provides a second compensation current I s2 To adjust the battery voltage V bat Maintaining as a discharge constant voltage point voltage V ref2 (ii) a Will last reach the discharge constant voltage point voltage V ref2 The battery cell BAT is marked as a second constant voltage identification battery, and in the main circuit provided by the DC power supply for the series formation, the battery voltage V of the battery cell BAT marked as the second constant voltage identification battery bat Maintaining as a discharge constant voltage point voltage V ref2 ；
At any time, the selected one or more unit batteries BAT can be bypassed by the loop switching module.
CN202210802379.2A 2022-07-07 2022-07-07 Auxiliary power supply for series formation, series formation system and control method thereof Withdrawn CN114977439A (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112271777A (en) * 2020-10-27 2021-01-26 东莞光亚智能科技有限公司 Series battery monomer constant voltage circuit and control method thereof
CN113013510A (en) * 2021-03-30 2021-06-22 时代一汽动力电池有限公司 Multi-power-supply composite series-connection formation and capacity grading equipment for lithium battery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112271777A (en) * 2020-10-27 2021-01-26 东莞光亚智能科技有限公司 Series battery monomer constant voltage circuit and control method thereof
CN113013510A (en) * 2021-03-30 2021-06-22 时代一汽动力电池有限公司 Multi-power-supply composite series-connection formation and capacity grading equipment for lithium battery

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