CN108400636B - Battery pack charging and discharging management system and method - Google Patents

Battery pack charging and discharging management system and method Download PDF

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Publication number
CN108400636B
CN108400636B CN201810243342.4A CN201810243342A CN108400636B CN 108400636 B CN108400636 B CN 108400636B CN 201810243342 A CN201810243342 A CN 201810243342A CN 108400636 B CN108400636 B CN 108400636B
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unit
charging
discharge
discharging
stage
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CN201810243342.4A
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Chinese (zh)
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CN108400636A (en
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刘铭新
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刘铭新
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014Circuits for equalisation of charge between batteries
    • H02J7/0019Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • H01M10/441Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0026Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially using safety or protection circuits, e.g. overcharge/discharge disconnection
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

A battery pack charging and discharging management system and a method relate to a charging and discharging control technology of a storage battery and belong to the technical field of storage battery control. The problem of adopt the equalization technique still can not effectively solve the inconsistency that brings because of battery degradation among the current charge-discharge management system is solved. The management method adopts a multi-stage intermittent charging or discharging method, in the charging/discharging process, the method is carried out in a progressive mode, different charging/discharging conditions are set in each stage, the next stage is switched to when the conditions are met, the switching time between adjacent stages is less than 10ms until the conditions of the last stage are met, and the charging/discharging duration time of each stage is 20-100 s. The management system comprises a switching control device for switching the unit battery and a bidirectional direct current converter for adjusting the voltage of the charge/discharge loop. The invention overcomes the prejudice of the prior art, can ensure that each unit battery in the battery pack is fully charged or emptied, and can save energy.

Description

Battery pack charging and discharging management system and method

Technical Field

The invention relates to a charge/discharge control technology of a storage battery, belonging to the technical field of storage battery control.

Background

As an electric energy storage device, since the voltage provided by the single storage battery is much less than the power supply voltage required by the load device, the storage battery must be connected in series and then used in the form of a battery pack. As shown in fig. 1

Because all the battery monomers in the storage battery pack adopt a direct series connection structure, the charging/discharging currents of the series battery monomers are completely the same, and all the battery monomers simultaneously realize the charging and discharging of the same current. Ideally, the cell voltages are equal, so the battery pack charge/discharge voltage is the cell voltage x the number of cells; however, in the actual usage environment, due to the manufacturing inconsistency of the battery cells and the usage environment, the characteristics of the battery cells, such as voltage, capacity and the like, are not consistent, and during the normal charging/discharging usage process of the battery pack, a part of the battery cells may be fully charged or under charged. The single batteries are in a full-charge or under-charge state for a long time, so that the non-uniformity of the single batteries in the battery pack is aggravated, other normal single batteries are fully charged or under-charged, the problem of battery degradation gradually occurs, and finally all batteries in the battery pack lose the capacity of storing electric energy.

Therefore, in the practical use of the battery pack, a user is required to replace all the batteries on time to ensure the electric energy storage capacity and the emergency power supply capacity of the battery pack, and once the deterioration or the failure of the single batteries is found, if the single batteries cannot be strictly and comprehensively detected and screened, and the replaceable batteries with high consistency with other batteries without deterioration or failure are replaced, all the single batteries in the same group must be replaced in the whole group, so that huge waste is generated.

In order to solve the problem of battery degradation caused by non-uniformity of the single batteries, so-called active (passive) equalization technology is mostly adopted at present, as shown in fig. 2, that is, a discharging load or a charging/discharging device is connected in parallel on a single battery to perform charging/discharging of the single batteries with small capacity on the basis of charging/discharging of a conventional battery pack, so as to adjust the uniformity of voltage or capacity of the single batteries in the battery pack, and achieve the effect of maintaining the batteries. The external equalizing device is connected to the battery monomer in a parallel mode, and the original monomer series connection wiring mode of the battery pack is not changed. The cell balancing apparatus has a limited capacity due to cost realizability, and can adjust only a small capacity, so that the practical effect is extremely limited, and the effect of inconsistency due to battery manufacturing or battery deterioration is hardly obtained.

Disclosure of Invention

The invention solves the problem that the existing charge/discharge management system still cannot effectively solve the inconsistency caused by battery degradation by adopting an equalization technology.

The battery pack charging and discharging management method adopts a multi-stage intermittent charging or discharging method, in the charging method, a progressive charging method is adopted, different charging conditions are set in each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are as synchronous as possible and all the unit cells reach a full-charge state; in the discharging method, a progressive discharging method is adopted, different discharging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are synchronized as much as possible and are emptied. The switching time between adjacent phases is less than 10 ms. The charge or discharge duration of each phase is between 20 and 100 s.

In the charging and discharging method, during the charging or discharging process, the number of the unit batteries which are maintained on-line is a fixed value n, the number of the off-line unit batteries is x, wherein n + x is the total number of the unit batteries contained in the battery pack; in the charging method, the terminal voltages of all unit batteries in the battery pack are monitored in real time in each stage, when the average variation of the terminal voltages of the on-line n unit batteries exceeds y, the charging in the stage is stopped, the i unit batteries with the maximum voltage in the on-line n unit batteries are cut off, then the i unit batteries with the minimum voltage in the off-line x unit batteries are cut in, and the charging is continued in the next stage until all the unit batteries in the battery pack are fully charged; in the discharging method, in each stage, the terminal voltages of all unit batteries in the battery pack are monitored in real time, when the average variation of the terminal voltages of the on-line n unit batteries exceeds y, the discharging in the stage is stopped, the i unit batteries with the minimum voltage in the on-line n unit batteries are cut off, then the i unit batteries with the maximum voltage in the off-line x unit batteries are cut in, and the discharging is continued in the next stage until all the unit batteries in the battery pack are emptied; the value of y ensures that the charge or discharge duration in each phase is between 20 and 100s, i being an integer greater than 0 and simultaneously less than n and x.

In the above charging and discharging method, the threshold value of each stage is the terminal voltage threshold value of the unit cell, and when each stage starts, the unit cell switched in on-line is selected according to the threshold value of the stage, and the corresponding charging or discharging voltage is adjusted according to the total number of the unit cells on-line, specifically: in the charging method, the threshold values of all stages are sequentially increased, and the maximum threshold value is the terminal voltage when the unit battery is fully charged; when each stage is started, selecting all unit batteries with terminal voltages smaller than the threshold value of the stage to cut into a charging loop, adjusting the charging voltage of the charging loop according to the total number of the unit batteries cut into the charging loop, then starting charging, monitoring the terminal voltages of all the unit batteries in the battery pack in real time in the charging process, suspending charging when the terminal voltage of a certain unit battery in the charging loop is detected to be not smaller than the threshold value of the stage, cutting off the unit battery, adjusting the voltage of the charging loop according to the number of the unit batteries in the charging loop, continuing charging until the terminal voltage of the last unit battery in the charging loop is not smaller than the threshold value of the stage, stopping the stage, and entering the next stage until the charging of the last stage is completed; in the discharging method, the threshold values of all stages are sequentially decreased progressively, and the minimum threshold value is the terminal voltage when the unit cell is discharged; when each stage is started, selecting all unit batteries with terminal voltages larger than the threshold value of the stage to cut into a discharge loop, adjusting the discharge voltage of the discharge loop according to the total number of the unit batteries cut into the discharge loop, then starting discharge, monitoring the terminal voltages of all the unit batteries in the battery pack in real time in the discharge process, suspending discharge when detecting that the terminal voltage of a certain unit battery in the discharge loop is not larger than the threshold value of the stage, cutting off the unit battery, adjusting the voltage of the discharge loop according to the number of the unit batteries in the discharge loop, continuing discharge until the terminal voltage of the last unit battery in the discharge loop is not larger than the threshold value of the stage, stopping the stage, and entering the next stage until the discharge of the last stage is completed.

The charge and discharge management system for realizing the charge and discharge management method comprises a bidirectional direct current converter, a switching control device and a plurality of switching switches, wherein the switching control device comprises a switching-in execution unit and a switching-out execution unit, and in the charge management system, the switching-in execution unit is used for controlling the switching switches to switch one or more designated unit batteries in a battery pack to be charged into a charging loop according to a received switching-in instruction; the cutting execution unit is used for controlling the switching switch to cut off the charging loop of one or more appointed unit batteries according to the received cutting instruction; in the discharge management system, the cut-in execution unit is used for controlling the switching switch to cut in one or more designated unit batteries in the battery pack to be discharged into a discharge loop according to the received cut-in instruction; the cutting execution unit is used for controlling the switching switch to cut off the discharging loop of the appointed one or more unit batteries according to the received cutting instruction; the bidirectional direct current converter is used for determining charging voltage according to the total number of the unit batteries in the charging loop in the charging management system, determining voltage conversion proportion according to the charging voltage, and further converting the input direct current voltage into the charging voltage to be output to the charging loop; the discharge management system is used for determining discharge voltage according to the total number of the unit batteries in the discharge loop, determining a voltage conversion proportion according to the discharge voltage, and further converting the discharge voltage into external direct current bus voltage for output.

The charging management system may further comprise a charging control device and a cell monitoring device, wherein the cell monitoring device is configured to monitor a terminal voltage of each cell and send the monitored terminal voltage and a serial number of the corresponding cell to the charging control device; the charge control device includes a threshold storage unit and a charge state determination unit, wherein: the threshold value storage unit stores a charging threshold value; the charging state judging unit is used for comparing each terminal voltage sent by the unit battery monitoring device with a charging threshold value, and sending a cutting instruction to the switching control device when the terminal voltage is greater than or equal to the charging threshold value, wherein the cutting instruction comprises a serial number of a unit battery corresponding to the terminal voltage.

In the above charging management system, the threshold storage unit stores n charging thresholds Ui, where i is a positive integer greater than 0, and U1< U2< … < Un, where Un is an upper charging limit voltage of the unit cell; the charging control device further comprises a threshold selection unit, wherein the threshold selection unit is used for adding the serial numbers of all the unit batteries with the terminal voltages lower than a charging threshold U1 into a switching-in command and sending the serial numbers to the switching-in control device when charging is started, and sending the charging threshold U1 to a charging state judgment unit as the charging threshold in the charging state judgment unit; the threshold selection unit is also used for adding the serial numbers of all the unit batteries with the terminal voltages lower than the charging threshold Uj into a switching-in command and sending the serial numbers to the switching-in control device after the last unit battery in the charging loop is cut off, and sending the charging threshold Uj to the charging state judgment unit as the charging threshold in the charging state judgment unit; and j is sequentially 2, 3, … and n.

The discharge management system may further include a discharge control device and a cell monitoring device, wherein the cell monitoring device is configured to monitor a terminal voltage of each cell and send the monitored terminal voltage and a serial number of the corresponding cell to the discharge control device; the discharge control device includes a threshold storage unit and a discharge state judgment unit, wherein: the threshold value storage unit stores a discharge threshold value; the discharge state judgment unit is used for comparing each terminal voltage sent by the unit battery monitoring device with the discharge threshold value, and sending a cutting instruction to the switching control device when the terminal voltage is less than or equal to the discharge threshold value, wherein the cutting instruction comprises the serial number of the unit battery corresponding to the terminal voltage.

The discharge management system may further include a discharge control device and a cell monitoring device, wherein the cell monitoring device is configured to monitor a terminal voltage of each cell and send the monitored terminal voltage and a serial number of the corresponding cell to the discharge control device; the discharge control device also comprises a threshold selection unit, wherein the threshold selection unit is used for adding the serial numbers of all the unit batteries with the end voltages higher than the discharge threshold U1 into a cut-in command and sending the serial numbers to the cut-in control device when the discharge is started, and sending the discharge threshold U1 to a discharge state judgment unit as a discharge threshold in the discharge state judgment unit;

in the discharge management system, n discharge thresholds Ui are stored in the threshold storage unit, i is a positive integer greater than 1, and U1> U2> … > Un, where Un is the discharge lower limit voltage of the unit cell; the discharge control device also comprises a threshold selection unit, wherein the threshold selection unit is used for adding the serial numbers of all the unit batteries with the end voltages higher than the discharge threshold U1 into a cut-in command and sending the serial numbers to the cut-in control device when the discharge is started, and sending the discharge threshold U1 to a discharge state judgment unit as a discharge threshold in the discharge state judgment unit; the threshold selection unit is also used for adding the serial numbers of all the unit batteries with the terminal voltages lower than the discharge threshold Uj into a cut-in command and sending the cut-in command to the cut-in control device after the last unit battery in the discharge loop is cut off, and sending the discharge threshold Uj to the discharge state judgment unit as the discharge threshold in the discharge state judgment unit; and j is sequentially 2, 3, … and n.

The charge and discharge principle of the charge and discharge management system of the battery pack overcomes the technical bias in the technical field of the existing battery charge/discharge management, and specifically comprises the following steps: firstly, the concept of charge-discharge balance control of a storage battery pack is completely abandoned, and the final control target of charge-discharge is that the unit battery is fully charged and emptied without over-charge and over-discharge; secondly, the conventional method for maintaining the continuity of the charging/discharging process is not adopted, and the intermittent charging/discharging mode is adopted to realize the charging and discharging management. Compared with the existing battery pack charging and discharging technology, the charging and discharging principle of the invention has the following advantages:

1. according to the battery pack charging and discharging management method and system, the unit batteries in the charged or discharged battery pack are not directly connected in series, but are connected in series through a controlled bidirectional switching switch, and the unit batteries participating in charging and discharging on line are periodically and dynamically adjusted by detecting the battery state, controlling the number of the on-line batteries and matching the charging and discharging voltages in the charging and discharging process, so that the full charge/discharge of each unit battery is finally realized, the full charge and discharge protection of the unit batteries is objectively realized, and the performance of each unit battery is ensured to be in the optimal state.

2. The charge and discharge management method and the system of the invention have the advantages that the storage battery to be charged or discharged is not directly connected with the charging and discharging direct current bus, but is connected with the direct current bus through a bidirectional direct current converter, the switching control device in the management system realizes the state detection of the unit battery, and cutting or putting the corresponding unit cell into a charging or discharging circuit according to the detection result of the unit cell, the bidirectional DC converter synchronously adjusts the charging voltage or the discharging input voltage according to the number of the on-line unit batteries changed in the charging or discharging loop on the premise of ensuring the charging and discharging DC bus voltage to be stable and unchanged, the real-time dynamic adjustment of the voltage of the charging loop or the discharging loop can effectively ensure the safe and reliable operation of all battery monomers in the charging and discharging process of the battery pack and the continuous and stable discharging in the discharging process.

3. The charge and discharge principle of the charge and discharge management system and the charge and discharge management method is completely different from the existing battery management device, and the management and control of the battery pack can be realized only by controlling the voltage and the current of the whole battery pack.

4. In the charge and discharge management system and method, a plurality of charge or discharge thresholds can be set, the unit batteries are not cut off or cut in when being fully charged or discharged, but the switching thresholds are dynamically adjusted in the charge and discharge process, and in the charge process, the charge thresholds are gradually switched from low to high, so that the unit batteries with lower electric energy are charged firstly, and the unit batteries with higher electric energy are charged later until all the unit batteries are fully charged. Similarly, in the discharging process, the discharging threshold value is gradually switched from high to low, so that the electric energy is higher and is discharged firstly, and the electric energy is lower and is then discharged until all the unit batteries are emptied. In this case, it is inevitable that each unit cell is stopped at a certain frequency during the charge/discharge process, that is: intermittent charge and discharge, which is obviously different from the conventional continuous charge/discharge manner, the intermittent period in the intermittent charge/discharge can be controlled to be in the order of (20 to 100s) by only reasonably setting the difference between a plurality of threshold values, and the intermittent time does not influence the charging/discharging process of the battery. The advantages of such intermittent charging and discharging are:

4.1, the charging and discharging process of the battery is electrochemical reaction, and the intermittent pause is designed in the charging process, namely the chemical reaction is paused in the reflecting process, and the pause is beneficial to the more thorough electrochemical reaction, so that the intermittent charging and discharging control method can ensure the more thorough electrochemical reaction in the battery, effectively improve the charging efficiency in the charging process and save the energy consumed by charging.

4.2, apparently, the intermittent charging process has a plurality of intermittent times, so that the charging time is prolonged, but the actual situation is not. In the conventional charging mode, a low-current charging mode is adopted for charging in the later period of the charging period, and the charging time in the state is longer, but the charging method provided by the invention can almost always keep large-current charging before the battery is fully charged, the low-current charging process in the later period of the conventional charging is not needed, and the intermittent charging is more favorable for the electrochemical reaction in the battery, so that the online charging time of the unit battery in the charging process is shorter than the conventional charging time, and the whole charging period is almost the same as the conventional charging mode.

4.3, the invention adopts an intermittent charge and discharge mode, wherein one purpose is to timely adjust the on-line unit batteries, further ensure that all the unit batteries in the battery pack can be fully charged or emptied, and completely avoid the problem that part of the batteries are always under charged or under discharged in the conventional charge and discharge method.

4.4, the switching of the unit cells is realized by adopting a change-over switch of a mos tube, which is equivalent to performing one-time full-band positive/negative current impact on the unit cells at the switching moment of the unit cells, so that salinized malignant diseases of the cells are eliminated to a certain extent, and the charging and discharging capacity of partial unit cells is improved, and the discharging time effect is prolonged.

5. The battery pack charging and discharging management method and system are different from the existing battery management balancing device which is mainly used for carrying out micro-regulation on the battery state in the standby state of the battery, and hardly influences the battery pack charging and discharging process (the regulating current of the existing battery management balancing device is 0.1-5A, and the charging and discharging current of the battery pack is 30-100A or even larger).

The battery pack charging and discharging management method and the battery pack charging and discharging management system can realize the storage capacity of the maximum electric energy of the battery pack.

The battery charging method can be applied to various battery charging devices and can also be applied to a battery formation system.

Drawings

Fig. 1 is a schematic block diagram of a conventional battery charge/discharge management system.

Fig. 2 is a schematic block diagram of a prior art battery pack charge/discharge management system with equalization.

Fig. 3 is a schematic block diagram of the operating state of the battery charge/discharge management system according to the present invention.

Fig. 4 is a schematic circuit diagram of the fling-cut switch K shown in fig. 3.

Detailed description of the preferred embodiments

In a first embodiment, a battery pack charge/discharge management method according to this embodiment is a multi-stage, intermittent charge or discharge method;

in the charging method, a progressive charging method is adopted, different charging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are as synchronous as possible and all the unit cells reach a full state;

in the discharging method, a progressive discharging method is adopted, different discharging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are synchronized as much as possible and are emptied.

The switching time between adjacent phases is less than 10ms, and the optimal value is less than 5 ms.

The charge or discharge duration of each phase is between 20 and 100 s.

The intermittent charging/discharging method is adopted, the pause in the charging or discharging process is more beneficial to more sufficient and thorough electrochemical reaction, and the effect of shortening the whole chemical reaction time is achieved on the premise that the chemical reaction is sufficiently excited, so that the effect of shortening the discharging time is achieved, and the effect of saving energy consumed by charging is also achieved.

In a second embodiment, the battery pack charge/discharge management method of this embodiment is a specific case of the battery pack charge/discharge management method of the first embodiment, in a charge or discharge process, the number of unit cells that are maintained online is a fixed value n, the number of unit cells that are offline is x, where n + x is the total number of unit cells included in the battery pack;

in the charging method, the terminal voltages of all unit batteries in the battery pack are monitored in real time in each stage, when the average variation of the terminal voltages of the on-line n unit batteries exceeds y, the charging in the stage is stopped, the i unit batteries with the maximum voltage in the on-line n unit batteries are cut off, then the i unit batteries with the minimum voltage in the off-line x unit batteries are cut in, and the charging is continued in the next stage until all the unit batteries in the battery pack are fully charged;

in the discharging method, in each stage, the terminal voltages of all unit batteries in the battery pack are monitored in real time, when the average variation of the terminal voltages of the on-line n unit batteries exceeds y, the discharging in the stage is stopped, the i unit batteries with the minimum voltage in the on-line n unit batteries are cut off, then the i unit batteries with the maximum voltage in the off-line x unit batteries are cut in, and the discharging is continued in the next stage until all the unit batteries in the battery pack are emptied;

the value of y ensures that the charge or discharge duration in each phase is between 20 and 100s, i being an integer greater than 0 and simultaneously less than n and x.

In this embodiment, y may take a value of 2% to 10%.

In the charging/discharging method according to this embodiment, the number of unit cells in the charging circuit or the discharging circuit is always maintained at a fixed value, and the charging voltage or the discharging voltage is further kept constant during the entire charging/discharging process, that is: it can be realized by using a charge/discharge power supply in the existing charge/discharge method.

In the intermittent charge/discharge method according to the present embodiment, the maximum/minimum on-line average voltage of the battery is used as a threshold control method, that is, the method includes: when the average variation of the terminal voltage of the unit cells in the charging circuit or the discharging circuit reaches a certain value, the charging/discharging is suspended, a part of the unit cells are replaced, and then the operation is continued, so that the charging time of the unit cells with low terminal voltage in the charging method is longer, all the unit cells are fully charged, the discharging time of the unit cells with high terminal voltage in the discharging method is longer, and all the unit cells are discharged.

In this embodiment, the smaller the value of the terminal voltage average variation y of the unit battery is, the more can it be ensured that each unit battery can be fully charged or emptied, but the more frequent the switching is, and the too short the charging or discharging time of each stage is, therefore, the parameter value principle is to ensure that the charging or discharging time of each stage is between 20 and 100s, generally, the value is preferably between 2% and 10%, and the most preferred value is 2%.

In a third embodiment, the battery charge/discharge management method of this embodiment is a specific case of the battery charge/discharge management method of the first embodiment, in the battery charge/discharge management method of this embodiment, the threshold value of each stage is a terminal voltage threshold value of a unit cell, and at the beginning of each stage, a unit cell switched into an on-line state is selected according to the threshold value of the stage, and a corresponding charge or discharge voltage is adjusted according to the total number of the on-line unit cells, specifically:

in the charging method, the threshold values of all stages are sequentially increased, and the maximum threshold value is the terminal voltage when the unit battery is fully charged; at the beginning of each stage, selecting all unit batteries with terminal voltage less than the threshold value of the stage to be switched into the charging loop, adjusting the charging voltage of the charging loop according to the total number of the unit batteries switched into the charging loop, and then starting charging,

monitoring the terminal voltages of all unit batteries in the battery pack in real time in the charging process, suspending charging when the terminal voltage of a certain unit battery in a charging loop is detected to be not less than the threshold value of the stage, cutting off the unit battery, adjusting the voltage of the charging loop according to the number of the unit batteries in the charging loop, continuing charging until the terminal voltage of the last unit battery in the charging loop is not less than the threshold value of the stage, stopping the stage, and entering the next stage until the charging of the last stage is completed;

in the discharging method, the threshold values of all stages are sequentially decreased progressively, and the minimum threshold value is the terminal voltage when the unit cell is discharged; at the beginning of each stage, selecting all unit cells with terminal voltage larger than the threshold value of the stage to switch in a discharge loop, adjusting the discharge voltage of the discharge loop according to the total number of the unit cells switched in the discharge loop, and then starting discharge,

and monitoring the terminal voltages of all unit batteries in the battery pack in real time in the discharging process, suspending discharging when detecting that the terminal voltage of a certain unit battery in a discharging loop is not more than the threshold value of the stage, cutting off the unit battery, adjusting the voltage of the discharging loop according to the number of the unit batteries in the discharging loop, and continuing discharging until the terminal voltage of the last unit battery in the discharging loop is not more than the threshold value of the stage, stopping the stage, and entering the next stage until the discharging of the last stage is completed.

In this embodiment, the smaller the threshold difference value of the adjacent stage is, the more frequent the charge/discharge switching is, and the longer the charge/discharge duration of each stage is. The principle of setting the parameters is to ensure that the charging or discharging time of each stage is between 20 and 100s, and is generally greater than 5% of the rated voltage of the unit cell.

In the charging/discharging method according to the present embodiment, the number of unit cells in the charging circuit or the discharging circuit is varied in each stage, and thus, at the start of each stage, it is necessary to adjust the corresponding circuit voltage according to the number of unit cells located in the charging circuit or the discharging circuit. Although the method is slightly complicated, the charging or discharging management is performed according to the terminal voltage condition of each unit cell, so that each unit cell in the battery pack can be fully charged or emptied.

The fourth embodiment will be described with reference to fig. 3. In the charging management system, the switching-in execution unit is used for controlling the switching switch to switch one or more designated unit batteries in the battery pack to be charged into a charging loop according to a received switching-in instruction; the cutting execution unit is used for controlling the switching switch to cut off the charging loop of one or more appointed unit batteries according to the received cutting instruction; in the discharge management system, the cut-in execution unit is used for controlling the switching switch to cut in one or more designated unit batteries in the battery pack to be discharged into a discharge loop according to the received cut-in instruction; the cutting execution unit is used for controlling the switching switch to cut off the discharging loop of the appointed one or more unit batteries according to the received cutting instruction;

the bidirectional direct current converter is used for determining charging voltage according to the total number of the unit batteries in the charging loop in the charging management system, determining voltage conversion proportion according to the charging voltage, and further converting the input direct current voltage into the charging voltage to be output to the charging loop; the discharge management system is used for determining discharge voltage according to the total number of the unit batteries in the discharge loop, determining a voltage conversion proportion according to the discharge voltage, and further converting the discharge voltage into external direct current bus voltage for output.

The unit cell described in the present embodiment is the minimum unit in the battery pack, and may be a single cell, or may be a minimum unit cell in which a plurality of single cells are connected in series or in parallel.

The fling-cut switch in the embodiment is a bidirectional fling-cut switch capable of realizing automatic control, and can be realized by selecting the existing electronic bidirectional fling-cut switch.

The bidirectional dc converter according to this embodiment may be implemented by using an existing bidirectional dc conversion circuit or a bidirectional dc conversion integrated circuit whose output voltage is controllable. The bidirectional direct current conversion circuit can convert the input direct current voltage into other voltage values to be output.

In practical application, a voltage input end of the bidirectional dc converter is connected to a dc bus for charging/discharging, the dc bus provides a stable dc voltage, in a charging process, a charging voltage is obtained by calculation according to the number of unit batteries located in a charging loop, then a voltage conversion ratio is determined according to the charging voltage and the dc bus voltage, and the input dc bus voltage is converted into the charging voltage to charge the charging loop, in the charging process, as the switching control device controls the switching switch to change the number of the unit batteries in the charging loop, the bidirectional dc converter also adjusts the voltage conversion ratio at any time, so as to ensure that the charging voltage of the charging loop adapts to the change of the number of the unit batteries in the loop, for example: when m unit batteries exist in the charging loop, the bidirectional direct current converter converts direct current voltage output by the direct current bus into (m battery unit rated voltage), and if one unit battery cuts off the charging loop in the charging process, the bidirectional direct current converter converts voltage output by the direct current bus into ((m-1) battery unit rated voltage); similarly, in the discharging process, the battery pack discharging voltage of the discharging loop is calculated according to the number of the unit batteries in the discharging loop, and the voltage conversion proportion is determined according to the discharging voltage and the direct-current bus voltage, so that the discharging voltage of the discharging loop is converted into the direct-current bus voltage to be connected with the direct-current bus.

In the battery pack charge/discharge management system according to this embodiment, on the premise that the external dc bus voltage is not changed, the voltage conversion ratio of the bidirectional dc converter is adjusted according to the number of the unit cells located in the charge circuit or the discharge circuit, so that the charge voltage or the discharge voltage is adapted to the change of the unit cells in the corresponding circuit on the premise that the bus voltage is not changed.

In the embodiment of the present invention, the switching control device can cut or switch in the designated unit battery according to an external command, that is: the embodiment provides an execution device capable of switching in or cutting off the unit battery from a charging or discharging loop at any time in the charging or discharging process, and the specific condition for switching in or cutting off the unit battery can be designed into a corresponding circuit or control software according to actual requirements. This charge/discharge management system is capable of individually controlling the charge/discharge time of each unit cell in a battery pack, i.e.: the charging or discharging can be terminated at any time according to the inherent characteristics of each unit cell in the battery pack so as to meet the requirements of unit cells with different inherent characteristics, ensure that each unit cell in the battery pack can be fully charged and not overcharged in the charging process, and each unit cell can be emptied and not overdischarged in the discharging process.

The battery pack charge/discharge management system according to the present embodiment may include only the charge management system or the discharge management system, or may include both of them.

A fifth embodiment is a further limitation to the battery pack charge/discharge management system according to the fourth embodiment, in which a monitoring function for the unit battery is added, and the cutting control for the unit battery is automatically implemented according to the monitoring result, specifically: the charging management system also comprises a charging control device and a unit battery monitoring device, wherein the unit battery monitoring device is used for monitoring the terminal voltage of each unit battery and sending the monitored terminal voltage and the serial number of the corresponding unit battery to the charging control device; the charge control device includes a threshold storage unit and a charge state determination unit, wherein: the threshold value storage unit stores a charging threshold value; the charging state judging unit is used for comparing each terminal voltage sent by the unit battery monitoring device with a charging threshold value, and sending a cutting instruction to the switching control device when the terminal voltage is greater than or equal to the charging threshold value, wherein the cutting instruction comprises a serial number of a unit battery corresponding to the terminal voltage; the discharge management system also comprises a discharge control device and a unit cell monitoring device, wherein the unit cell monitoring device is used for monitoring the terminal voltage of each unit cell and sending the monitored terminal voltage and the serial number of the corresponding unit cell to the discharge control device; the discharge control device includes a threshold storage unit and a discharge state judgment unit, wherein: the threshold value storage unit stores a discharge threshold value; the discharge state judgment unit is used for comparing each terminal voltage sent by the unit battery monitoring device with the discharge threshold value, and sending a cutting instruction to the switching control device when the terminal voltage is less than or equal to the discharge threshold value, wherein the cutting instruction comprises the serial number of the unit battery corresponding to the terminal voltage.

In the embodiment, on the basis of the battery pack charge/discharge management system in the first embodiment, a monitoring function of the unit battery is added, and a full-automatic process of automatically detecting, automatically judging the removal condition of the unit battery and automatically removing the corresponding unit battery is realized. The battery pack charge/discharge management system according to the embodiment can ensure that each unit cell in the battery pack can be fully charged without overshoot, and each unit cell can be emptied without over-discharge.

The monitoring function added in the embodiment can be realized by adopting the conventional multi-path battery performance detection circuit.

Sixth embodiment, this embodiment is a further limitation to the battery pack charge/discharge management system described in fifth embodiment, where multiple charge thresholds are added in this embodiment to implement a control process of intermittent charge/discharge, specifically: in the charge management system, n charge thresholds Ui are stored in the threshold storage unit, i is a positive integer greater than 0, and U1< U2< … < Un, Un is the upper limit voltage of charge of the unit cell; the charging control device further comprises a threshold selection unit, wherein the threshold selection unit is used for adding the serial numbers of all the unit batteries with the terminal voltages lower than a charging threshold U1 into a switching-in command and sending the serial numbers to the switching-in control device when charging is started, and sending the charging threshold U1 to a charging state judgment unit as the charging threshold in the charging state judgment unit; the threshold selection unit is also used for adding the serial numbers of all the unit batteries with the terminal voltages lower than the charging threshold Uj into a switching-in command and sending the serial numbers to the switching-in control device after the last unit battery in the charging loop is cut off, and sending the charging threshold Uj to the charging state judgment unit as the charging threshold in the charging state judgment unit; the value of j is 2, 3, … and n in sequence; in the discharge management system, n discharge thresholds Ui are stored in the threshold storage unit, i is a positive integer greater than 1, and U1> U2> … > Un, Un is the discharge lower limit voltage of the unit cell; the discharge control device in the discharge management system further comprises a threshold selection unit, wherein the threshold selection unit is used for adding the serial numbers of all the unit batteries with the terminal voltages lower than the charging threshold U1 into a cut-in command and sending the serial numbers to the cut-in control device when the discharge starts, and sending the discharging threshold U1 to a discharging state judgment unit as a discharging threshold in the discharging state judgment unit; the threshold selection unit is also used for adding the serial numbers of all the unit batteries with the terminal voltages lower than the discharge threshold Uj into a cut-in command and sending the cut-in command to the cut-in control device after the last unit battery in the discharge loop is cut off, and sending the discharge threshold Uj to the discharge state judgment unit as the discharge threshold in the discharge state judgment unit; and j is sequentially 2, 3, … and n.

In the battery pack charge/discharge management system according to this embodiment, a plurality of charge/discharge thresholds are provided, and an intermittent charge/discharge control method is adopted in the charge/discharge process, that is, the intermittent charge/discharge control method includes: the method is characterized in that the battery meeting the current threshold is cut off instead of cutting off when the unit batteries are fully charged or discharged, a plurality of thresholds are set in a step principle in the charging/discharging process, and after all the unit batteries meet the current threshold, all the unit batteries are cut into the unit batteries to change to the next threshold for charging/discharging control again until all the unit batteries meet full charge/discharge. During such charge/discharge processes, a certain frequency of stopping operations of some unit cells during the charge/discharge processes are caused, that is: this state does not affect the battery formation for intermittent charge/discharge.

In the charging process of the battery pack charge/discharge management system according to this embodiment, the unit cells with lower voltage are first switched into the charging loop to be charged, and after the electric quantity of the cells meets the lower charging threshold, the unit cells with higher voltage are switched into the charging loop to be charged, that is: firstly, charging the unit batteries with low electric quantity, and then gradually adding the unit batteries with slightly high electric quantity into the unit batteries to continue charging; the same principle is that: in the discharging process, the unit cell with more electric quantity is selected to discharge, and then the unit cell with the lower electric quantity is added to discharge. Through reasonable adjustment and setting of a plurality of charging/discharging threshold values, more reasonable charging/discharging process control is achieved.

In the threshold selecting unit according to this embodiment, when the charge/discharge threshold is switched, not only after all the unit cells in all the charge/discharge loops are cut off, but also when the last unit cell in the charge/discharge loop satisfies the cut-off condition, the charge/discharge threshold may be switched, that is: switching all the unit cells below or above the charge/discharge threshold into the charge/discharge loop; the charge/discharge threshold may be switched after a specified number of unit cells remain in the charge/discharge, that is: all the unit cells below or above the charge/discharge threshold are switched into the charge/discharge loop.

The switching switch in the embodiment may be implemented by a mosfet power device, for example: the implementation is realized by using two mosfet power devices T1 and T2 and a zener diode D1, referring to fig. 4, the zener diode D1 is used for being connected in parallel with a switching switch connection unit cell, one mosfet power device is used as a switching-in switch, the other mosfet power device is used as a cutting-off switch, and control signals of the two mosfet power devices T1 and T2 are opposite.

The cut-in switch is used for cutting the corresponding unit battery into a charging or discharging loop, and is equivalent to a cut-in execution unit. The cut-off switch is also a bypass switch, and is used for bypassing the corresponding unit cell from the charging or discharging loop, so that the unit cell bypasses from the charging or discharging loop, and is equivalent to a cut-off execution unit. In order to prevent the occurrence of the phenomenon of battery short circuit discharge caused by instantaneous simultaneous conduction, the two mosfet power devices T1 and T2 adopt a dead zone control mode to avoid the occurrence of the state that the cut-in switch and the cut-off switch are simultaneously conducted.

The mosfet power devices T1 and T2 described in this embodiment are mosfet power devices provided with antiparallel diodes.

The switching speed of the switching switch is high, and can reach microsecond level, so that the switching-in or cutting-off action of the unit battery at each time can not influence the charging or discharging process, and the phenomenon that the battery pack is connected in series and is not instantaneously disconnected is ensured.

Claims (8)

1. A method for managing the charge and discharge of a battery pack, which comprises a multi-stage intermittent charge or discharge method,
in the charging method, a progressive charging method is adopted, different charging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are as synchronous as possible and all the unit cells reach a full state;
in the discharging method, a progressive discharging method is adopted, different discharging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are synchronized as much as possible and reach the state of being emptied;
the method is characterized in that in the charging or discharging process, the number of the unit batteries which are maintained on line is a fixed value n, the number of the unit batteries which are off line is x, wherein n + x is the total number of the unit batteries contained in the battery pack;
in the charging method, the terminal voltages of all unit batteries in the battery pack are monitored in real time in each stage, when the average variation of the terminal voltages of the on-line n unit batteries exceeds y, the charging in the stage is stopped, the i unit batteries with the maximum voltage in the on-line n unit batteries are cut off, then the i unit batteries with the minimum voltage in the off-line x unit batteries are cut in, and the charging is continued in the next stage until all the unit batteries in the battery pack are fully charged;
in the discharging method, in each stage, the terminal voltages of all unit batteries in the battery pack are monitored in real time, when the average variation of the terminal voltages of the on-line n unit batteries exceeds y, the discharging in the stage is stopped, the i unit batteries with the minimum voltage in the on-line n unit batteries are cut off, then the i unit batteries with the maximum voltage in the off-line x unit batteries are cut in, and the discharging is continued in the next stage until all the unit batteries in the battery pack are emptied;
the value of y ensures that the charge or discharge duration in each phase is between 20 and 100s, i being an integer greater than 0 and simultaneously less than n and x.
2. A method for managing the charge and discharge of a battery pack, which comprises a multi-stage intermittent charge or discharge method,
in the charging method, a progressive charging method is adopted, different charging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are as synchronous as possible and all the unit cells reach a full state;
in the discharging method, a progressive discharging method is adopted, different discharging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are synchronized as much as possible and reach the state of being emptied;
the switching time between adjacent stages is less than 10 ms;
the method is characterized in that in the charging or discharging process, the number of the unit batteries which are maintained on line is a fixed value n, the number of the unit batteries which are off line is x, wherein n + x is the total number of the unit batteries contained in the battery pack;
in the charging method, the terminal voltages of all unit batteries in the battery pack are monitored in real time in each stage, when the average variation of the terminal voltages of the on-line n unit batteries exceeds y, the charging in the stage is stopped, the i unit batteries with the maximum voltage in the on-line n unit batteries are cut off, then the i unit batteries with the minimum voltage in the off-line x unit batteries are cut in, and the charging is continued in the next stage until all the unit batteries in the battery pack are fully charged;
in the discharging method, in each stage, the terminal voltages of all unit batteries in the battery pack are monitored in real time, when the average variation of the terminal voltages of the on-line n unit batteries exceeds y, the discharging in the stage is stopped, the i unit batteries with the minimum voltage in the on-line n unit batteries are cut off, then the i unit batteries with the maximum voltage in the off-line x unit batteries are cut in, and the discharging is continued in the next stage until all the unit batteries in the battery pack are emptied;
the value of y ensures that the charge or discharge duration in each phase is between 20 and 100s, i being an integer greater than 0 and simultaneously less than n and x.
3. The battery pack charge and discharge management method according to claim 1 or 2, wherein a value of y is 2% to 5%.
4. A method for managing the charge and discharge of a battery pack, which comprises a multi-stage intermittent charge or discharge method,
in the charging method, a progressive charging method is adopted, different charging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are as synchronous as possible and all the unit cells reach a full state;
in the discharging method, a progressive discharging method is adopted, different discharging conditions are set at each stage, and the condition of monitoring and judging the state of each unit cell is taken as a condition, so that all the unit cells are synchronized as much as possible and reach the state of being emptied;
the method is characterized in that the threshold value of each stage is the terminal voltage threshold value of the unit cell, and when each stage starts, the unit cell switched into the online is selected according to the threshold value of the stage, and the corresponding charging or discharging voltage is adjusted according to the total number of the unit cells on the online, and the method specifically comprises the following steps:
in the charging method, the threshold values of all stages are sequentially increased, and the maximum threshold value is the terminal voltage when the unit battery is fully charged; at the beginning of each stage, selecting all unit batteries with terminal voltage less than the threshold value of the stage to be switched into the charging loop, adjusting the charging voltage of the charging loop according to the total number of the unit batteries switched into the charging loop, and then starting charging,
monitoring the terminal voltages of all unit batteries in the battery pack in real time in the charging process, suspending charging when the terminal voltage of a certain unit battery in a charging loop is detected to be not less than the threshold value of the stage, cutting off the unit battery, adjusting the voltage of the charging loop according to the number of the unit batteries in the charging loop, continuing charging until the terminal voltage of the last unit battery in the charging loop is not less than the threshold value of the stage, stopping the stage, and entering the next stage until the charging of the last stage is completed;
in the discharging method, the threshold values of all stages are sequentially decreased progressively, and the minimum threshold value is the terminal voltage when the unit cell is discharged; at the beginning of each stage, selecting all unit cells with terminal voltage larger than the threshold value of the stage to switch in a discharge loop, adjusting the discharge voltage of the discharge loop according to the total number of the unit cells switched in the discharge loop, and then starting discharge,
and monitoring the terminal voltages of all unit batteries in the battery pack in real time in the discharging process, suspending discharging when detecting that the terminal voltage of a certain unit battery in a discharging loop is not more than the threshold value of the stage, cutting off the unit battery, adjusting the voltage of the discharging loop according to the number of the unit batteries in the discharging loop, and continuing discharging until the terminal voltage of the last unit battery in the discharging loop is not more than the threshold value of the stage, stopping the stage, and entering the next stage until the discharging of the last stage is completed.
5. The battery pack charging and discharging management method according to claim 4, wherein the threshold difference values of adjacent stages are determined according to a rule that the charging or discharging duration time of each stage is 20 to 100 s.
6. The battery pack charging and discharging management system is characterized by comprising a bidirectional direct current converter, a switching control device and a plurality of switching switches,
the switching control device comprises a switching-in execution unit and a cutting-off execution unit,
in the charging management system, the switching-in execution unit is used for controlling the switching-in switch to switch in one or more designated unit batteries in the battery pack to be charged into the charging loop according to the received switching-in instruction; the cutting execution unit is used for controlling the switching switch to cut off the charging loop of one or more appointed unit batteries according to the received cutting instruction;
in the discharge management system, the cut-in execution unit is used for controlling the switching switch to cut in one or more designated unit batteries in the battery pack to be discharged into a discharge loop according to the received cut-in instruction; the cutting execution unit is used for controlling the switching switch to cut off the discharging loop of the appointed one or more unit batteries according to the received cutting instruction;
the bidirectional direct current converter is used for determining charging voltage according to the total number of the unit batteries in the charging loop in the charging management system, determining voltage conversion proportion according to the charging voltage, and further converting the input direct current voltage into the charging voltage to be output to the charging loop; the discharge management system is used for determining discharge voltage according to the total number of the unit batteries in the discharge loop, determining a voltage conversion proportion according to the discharge voltage, and further converting the discharge voltage into external direct current bus voltage for output.
7. The battery pack charge and discharge management system according to claim 6, further comprising a charge control device and a cell monitoring device in the charge management system, wherein the cell monitoring device is configured to monitor a terminal voltage of each cell and transmit each monitored terminal voltage and a serial number of the corresponding cell to the charge control device;
the charge control device includes a threshold storage unit and a charge state determination unit, wherein:
the threshold value storage unit stores a charging threshold value;
the charging state judging unit is used for comparing each terminal voltage sent by the unit battery monitoring device with a charging threshold value, and sending a cutting instruction to the switching control device when the terminal voltage is greater than or equal to the charging threshold value, wherein the cutting instruction comprises a serial number of a unit battery corresponding to the terminal voltage;
the discharge management system also comprises a discharge control device and a unit cell monitoring device, wherein the unit cell monitoring device is used for monitoring the terminal voltage of each unit cell and sending the monitored terminal voltage and the serial number of the corresponding unit cell to the discharge control device;
the discharge control device includes a threshold storage unit and a discharge state judgment unit, wherein: the threshold value storage unit stores a discharge threshold value; the discharge state judgment unit is used for comparing each terminal voltage sent by the unit battery monitoring device with the discharge threshold value, and sending a cutting instruction to the switching control device when the terminal voltage is less than or equal to the discharge threshold value, wherein the cutting instruction comprises the serial number of the unit battery corresponding to the terminal voltage.
8. The battery pack charge and discharge management system according to claim 7, wherein in the charge management system, n charge thresholds Ui, i being a positive integer greater than 0, and U1< U2< … < Un, Un being the upper limit charge voltage of the unit cell, are stored in the threshold storage unit;
the charging control device further comprises a threshold selection unit, wherein the threshold selection unit is used for adding the serial numbers of all the unit batteries with the terminal voltages lower than a charging threshold U1 into a switching-in command and sending the serial numbers to the switching-in control device when charging is started, and sending the charging threshold U1 to a charging state judgment unit as the charging threshold in the charging state judgment unit;
the threshold selection unit is also used for adding the serial numbers of all the unit batteries with the terminal voltages lower than the charging threshold Uj into a switching-in command and sending the serial numbers to the switching-in control device after the last unit battery in the charging loop is cut off, and sending the charging threshold Uj to the charging state judgment unit as the charging threshold in the charging state judgment unit; the value of j is 2, 3, … and n in sequence;
in the discharge management system, n discharge thresholds Ui are stored in the threshold storage unit, i is a positive integer greater than 1, and U1> U2> … > Un, Un is the discharge lower limit voltage of the unit cell;
the discharge control device also comprises a threshold selection unit, wherein the threshold selection unit is used for adding the serial numbers of all the unit batteries with the end voltages higher than the discharge threshold U1 into a cut-in command and sending the serial numbers to the cut-in control device when the discharge is started, and sending the discharge threshold U1 to a discharge state judgment unit as a discharge threshold in the discharge state judgment unit;
the threshold selection unit is also used for adding the serial numbers of the unit batteries with the end voltages higher than the discharge threshold Uj into a cut-in command and sending the cut-in command to the cut-in control device after the last unit battery in the discharge loop is cut off, and sending the discharge threshold Uj to the discharge state judgment unit as the discharge threshold in the discharge state judgment unit; and j is sequentially 2, 3, … and n.
CN201810243342.4A 2018-03-23 2018-03-23 Battery pack charging and discharging management system and method CN108400636B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2826789Y (en) * 2005-10-14 2006-10-11 中国电子科技集团公司第十八研究所 Charge/discharge protection circuit of lithium ion battery pack for electric vehicle
CN202888901U (en) * 2012-11-02 2013-04-17 上海同异动力科技有限公司 Equalization circuit for battery pack
CN103326417A (en) * 2013-05-07 2013-09-25 国家电网公司 Charge-discharge equalization control circuit of battery pack
CN103647328A (en) * 2013-12-23 2014-03-19 中国科学院电工研究所 Ladder type gradual parameter attenuation battery equalization method
CN103887862A (en) * 2012-12-19 2014-06-25 中国移动通信集团甘肃有限公司 Flexible charging and discharging management rectifier module, and management tree device and system
CN104253469A (en) * 2014-09-24 2014-12-31 于志章 Secondary battery pack charging and discharging management system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9252617B2 (en) * 2012-12-17 2016-02-02 Lenovo (Singapore) Pte. Ltd. Battery cycling and management

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2826789Y (en) * 2005-10-14 2006-10-11 中国电子科技集团公司第十八研究所 Charge/discharge protection circuit of lithium ion battery pack for electric vehicle
CN202888901U (en) * 2012-11-02 2013-04-17 上海同异动力科技有限公司 Equalization circuit for battery pack
CN103887862A (en) * 2012-12-19 2014-06-25 中国移动通信集团甘肃有限公司 Flexible charging and discharging management rectifier module, and management tree device and system
CN103326417A (en) * 2013-05-07 2013-09-25 国家电网公司 Charge-discharge equalization control circuit of battery pack
CN103647328A (en) * 2013-12-23 2014-03-19 中国科学院电工研究所 Ladder type gradual parameter attenuation battery equalization method
CN104253469A (en) * 2014-09-24 2014-12-31 于志章 Secondary battery pack charging and discharging management system

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