CN116865372A - Control method, battery pack system and energy storage device - Google Patents

Control method, battery pack system and energy storage device Download PDF

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Publication number
CN116865372A
CN116865372A CN202310594674.8A CN202310594674A CN116865372A CN 116865372 A CN116865372 A CN 116865372A CN 202310594674 A CN202310594674 A CN 202310594674A CN 116865372 A CN116865372 A CN 116865372A
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CN
China
Prior art keywords
battery pack
battery
battery packs
state information
discharge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310594674.8A
Other languages
Chinese (zh)
Inventor
于扬鑫
陈玉光
郑锐畅
陈熙
王雷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ecoflow Technology Ltd
Original Assignee
Ecoflow Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ecoflow Technology Ltd filed Critical Ecoflow Technology Ltd
Priority to CN202310594674.8A priority Critical patent/CN116865372A/en
Publication of CN116865372A publication Critical patent/CN116865372A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • 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
    • 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
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The application provides a control method, a battery pack system and energy storage equipment, wherein the method comprises the following steps: acquiring charge state information and discharge state information of a plurality of battery packs; determining a battery pack to be selected from the plurality of battery packs according to the charge state information and the discharge state information of the plurality of battery packs; selecting a target battery pack from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected; and sending a power supply control instruction to the target battery pack to enable the target battery pack. The method can avoid power failure of the battery pack system or over-discharge of the battery pack.

Description

Control method, battery pack system and energy storage device
Technical Field
The present application relates to the field of battery packs, and in particular, to a control method, a battery pack system, and an energy storage device.
Background
The energy storage device generally includes a battery pack system in which a plurality of battery packs are connected in parallel, each battery pack in the battery pack system is configured with an energy management system (Energy Management System, EMS), and is divided into a master battery pack and a slave battery pack, and charge and discharge of each battery pack are uniformly controlled by the EMS of the master battery pack. However, the power supply mode of the conventional battery pack system is relatively single, which easily causes power failure of the battery pack system or overdischarge of the battery pack.
Disclosure of Invention
The application mainly aims to provide a control method of a battery pack system, the battery pack system and energy storage equipment, and aims to solve the problems that the power supply mode of the traditional battery pack system is single, and power failure of the battery pack system or overdischarge of the battery pack is easy to cause.
In a first aspect, the present application provides a control method of a battery pack system including a plurality of battery packs; the power supply control method comprises the following steps:
acquiring charge state information and discharge state information of a plurality of battery packs;
determining a battery pack to be selected from a plurality of battery packs according to the charge state information and the discharge state information of the plurality of battery packs;
selecting a target battery pack from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected;
and sending a power supply control instruction to the target battery pack so as to enable the target battery pack.
In a second aspect, the present application further provides a battery pack system, where the battery pack system includes a plurality of batteries, and the battery pack includes an energy management system for implementing the control method according to the embodiment of the present application.
In a third aspect, the present application also provides an energy storage device comprising:
the charging and discharging interface is used for connecting external equipment;
the battery pack system according to the embodiment of the application is connected with the charge-discharge interface.
According to the control method provided by the embodiment of the application, the battery pack to be selected is determined from the plurality of battery packs according to the charge state information and the discharge state information of the plurality of battery packs, so that overdischarge caused by continuous discharge of the battery packs due to a single power supply mode can be avoided. And, according to the electric energy parameter of waiting to select the battery package, select out the target battery package from waiting to select the battery package, this target battery package possesses the power supply ability, can avoid battery package system to lose power.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an application scenario diagram of a control method provided by an embodiment of the present application;
fig. 2 is another application scenario diagram of the control method provided by the embodiment of the present application;
FIG. 3 is a flowchart illustrating steps of a control method according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating steps of another control method according to an embodiment of the present application;
FIG. 5 is a flowchart illustrating steps of another control method according to an embodiment of the present application;
fig. 6 is a schematic block diagram of a battery pack according to an embodiment of the present application;
fig. 7 is a schematic block diagram of an energy storage device according to an embodiment of the present application.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application; it will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 is an application scenario diagram of a control method of a battery pack system according to an embodiment of the present application. As shown in fig. 1, the control method is applicable to a battery pack system 10, and the battery pack system 10 includes a plurality of battery packs 11, the positive electrode of each battery pack 11 being connected to the positive electrode terminal p+ of the dc bus bar, and the negative electrode of each battery pack 11 being connected to the negative electrode terminal P-of the dc bus bar.
The direct current bus can be connected with a functional circuit, and the functional circuit can comprise circuit units such as an inverter circuit, a rectifying circuit, a voltage conversion circuit, a voltage stabilizing circuit and the like. If the positive electrode P+ of the direct current bus can be connected with the positive electrode of the voltage conversion circuit, the negative electrode P-of the direct current bus can be connected with the negative electrode of the voltage conversion circuit, and the voltage conversion circuit is used for being connected with external equipment. The plurality of battery packs 11 in the battery pack system 10 may be connected to an external device through a dc bus, a voltage conversion circuit, to discharge the external device, or to receive an electrical signal of the external device to charge the battery packs.
Each battery pack 11 may be provided with an energy management system (Energy Management System, EMS), and may be divided into a master battery pack and a slave battery pack, and the master battery pack may be selected from a plurality of battery packs 11 according to actual situations. The charging and discharging of each battery pack are uniformly controlled by the EMS of the main battery pack, and the power supply control method can be particularly applied to the EMS of the main battery pack. Each battery pack 11 may also be configured with a battery module and a battery management system (Battery Management System, BMS) for managing and maintaining each battery pack 11.
Currently, when the battery pack system 10 is connected to a power conversion unit (corresponding to a charger), the battery pack system defaults to a charged state. When the charging power of the battery pack system is 0 and the discharging power is greater than 0, the battery pack system defaults to enter a discharging state.
Based on this, the battery pack system may have charge errors and discharge errors. When all battery packs in the battery pack system have charging errors (such as charging overcurrent), the charging switch tube of each battery pack is opened, and the battery pack system cannot enter a charging state. If the user executes operations such as forced startup and the like at this time, the battery pack system needs to respond to the operations, and the main battery pack is started by default to discharge. However, when the main battery pack is low in power, the under-voltage protection is easily triggered. After the user performs operations such as forced startup for many times, the main battery pack is damaged even due to overdischarge.
Or when all battery packs in the battery pack system have discharge errors, the discharge switch tube of each battery pack is disconnected, the battery pack system cannot supply power for electric equipment, and the controller of each battery pack in the battery pack system is powered down.
Illustratively, as shown in fig. 2, the battery pack system 10 includes a battery pack a and a battery pack B. The battery pack A and the battery pack B are connected with the power conversion unit 20 through positive electrode terminals P+ and negative electrode terminals P-of the direct current buses, and the power conversion unit 20 is connected with the external equipment 30 through a charge-discharge interface. The power conversion unit 20 may be a module unit in a power distribution device (such as an electric cabinet, etc.), and the external device 30 may include an external power source and electric equipment. The external power source may include commercial power, energy storage devices, solar power generation systems, wind power generation systems, etc., and the electrical equipment may include home air conditioner, outdoor air conditioner, washing machine, water heater, mower, etc.
Each battery pack 11 in the battery pack system 10 may be charged or discharged. When the charge/discharge interface is connected to an external power source, the power conversion unit 20 may perform power conversion on the electric energy provided by the external power source, so as to charge each battery pack 11 in the battery pack system 10. When the charge-discharge interface is connected with the electric equipment, the power conversion unit 20 can perform power conversion on the electric energy provided by each battery pack 11 in the battery pack system 10 and output the electric energy to the electric equipment.
As shown in fig. 2, each of the battery packs a and B is provided with a charge switching tube and a discharge switching tube, respectively. The battery pack a includes a charge switching tube Q1 and a discharge switching tube Q2, and the battery pack B includes a charge switching tube Q3 and a discharge switching tube Q4. Battery pack a and battery pack B are also configured with a battery management system (Battery Management System, BMS) and an energy management system (Energy Management System, EMS) (not shown in the figures). When only the battery pack a is connected to the power conversion unit 20, the EMS of the battery pack a is enabled. When the battery pack B is connected to the battery pack a, the battery pack a and the battery pack B constitute the battery pack system 10. Battery pack a acts as the master battery pack, enabling the EMS of battery pack a to orchestrate the charge or discharge control of battery pack system 10. Battery pack B as a slave battery pack, the EMS of the battery pack B is disabled.
Assuming that battery pack a and battery pack B have both generated a charge error (e.g., charge over-current), since the system is connected to power conversion unit 20 at this time, in a charged state, but battery pack a and battery pack B have both generated a charge error, main pack a is enabled by default.
Assuming that in a low temperature environment, battery pack a and battery pack B are converted to a charged state, charge low temperature protection is generated and thus cannot be charged, resulting in that the charge switching transistors Q1, Q3 of battery pack a and battery pack B are all turned off. If the remaining Charge (SOC) Of the battery pack a is 0% and an under-voltage occurs at this time, the SOC Of the battery pack B is >0% but other discharge errors (e.g., discharge overcurrent) are generated, at which time the main pack battery pack a is activated by default. Because the battery pack A generates low charging temperature, the charging switch tube Q1 of the battery pack A is disconnected, discharge under-voltage is generated, and the discharging switch tube Q2 is disconnected, namely the battery pack A cannot be charged or discharged.
After the battery pack B waits for recovery from the discharge overcurrent error, the battery pack B still cannot be cut off, because the battery pack system 10 is connected with the charger and has no discharge current, the battery pack system 10 is in a charging state, and the battery pack a and the battery pack B are both in the error of low charging temperature, and the battery pack a is started by default.
Assuming that the charging power is 0 at this time and the discharging power is not changed, the battery pack system 10 is shifted to the discharging state. The charge switching tube Q1 of the battery pack a is forced to be turned on, but the battery pack a is low in battery. After the battery pack A discharges for a period of time, the hardware under-voltage protection is triggered, and then the discharging switch tube Q2 and the charging switch tube Q1 of the battery pack A are directly turned off. The power supply from the cutting machine to the battery pack B is not enough, so that the connected electric equipment is powered off.
In summary, the conventional battery pack system has a single power supply mode, and when the battery pack a (main pack) is exhausted, the power supply of the battery pack system 10 cannot be maintained, so that the battery pack system 10 is powered down; or overdischarge of the battery pack a occurs due to the continuous discharge of the battery pack a (main pack).
In order to solve the above-mentioned problems, the embodiment of the present application provides a control method of a battery pack system, which can be applied to the battery pack system 10 shown in fig. 1 or fig. 2, and can avoid power failure of the battery pack system and overdischarge caused by continuous discharge of the battery pack.
Referring to fig. 3, fig. 3 is a schematic step flow chart of a control method according to an embodiment of the present application, where the power supply control method includes:
s101, acquiring charge state information and discharge state information of a plurality of battery packs.
In this step, the energy management system EMS may acquire charge state information of a plurality of battery packs and discharge state information of a plurality of battery packs. Wherein the charge state information includes charge normality and charge error, and the discharge state information includes discharge normality and discharge error.
In the step, when the battery pack system is in a charging state, whether the battery pack has the problems of over-charging, low-temperature protection or overheat protection and the like is determined; if the battery pack has the problems of over-charging, low-temperature protection, overheat protection and the like, the charging state information of the battery pack is confirmed to be a charging error; if the battery pack has no problems of over-current charging, over-voltage charging, low-temperature protection, overheat protection and the like, the charging state information of the battery pack is confirmed to be normal in charging.
In the step, when the battery pack system is in a discharging state, whether the battery pack has the problems of over-discharge, under-discharge, low-temperature protection or overheat protection and the like is determined; if the battery pack has the problems of over-discharge, under-discharge, low-temperature protection, overheat protection and the like, the discharging state information of the battery pack is confirmed to be a discharging error; if the battery pack has no problems of discharge overcurrent, discharge undervoltage, low-temperature protection, overheat protection and the like, the discharge state information of the battery pack is confirmed to be normal in discharge.
In this step, the state of charge or the state of discharge of the battery pack system may be determined according to actual conditions. For example, when the battery pack system is connected to the power conversion unit (corresponding to a charger), the battery pack system defaults to a charged state. When the charging power of the battery pack system is 0 and the discharging power is greater than 0, the battery pack system defaults to enter a discharging state.
S102, determining a battery pack to be selected from the plurality of battery packs according to the charge state information and the discharge state information of the plurality of battery packs.
In this step, when the battery pack system is in a charged state, it may be determined from among a plurality of battery packs that the charged state information is a battery pack that is normally charged as a battery pack to be selected. In this step, when the battery pack system is in a discharge state, it may be determined from among a plurality of battery packs that the discharge state information is a battery pack that is normally discharged as a battery pack to be selected.
In this step, when the battery pack system is in a charged state, the charged state information of the plurality of battery packs may be a charging error, and then a battery pack whose discharged state information is normal in discharge may be determined as a battery pack to be selected from the plurality of battery packs.
In this step, when the battery pack system is in a discharging state, the discharging state information of the plurality of battery packs may be a discharging error, and then a battery pack whose charging state information is normal in charging may be determined as a battery pack to be selected from the plurality of battery packs.
S103, selecting a target battery pack from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected.
In this step, the electrical energy parameters of the battery pack to be selected may include parameters such as a voltage value, a current value, an SOC value, and a remaining power. In this step, according to the electric energy parameter of the battery pack to be selected, a target battery pack that can be used to supply power to the battery pack system can be selected from the battery packs to be selected.
In this step, the target battery pack selected from the battery packs to be selected may be one or more. In the step, the target battery pack is selected from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected, so that the selected target battery pack is ensured to have electric energy for supplying power to a battery pack system.
S104, sending a power supply control instruction to the target battery pack to enable the target battery pack.
In the step, after the target battery pack is selected, a power supply control instruction is sent to the target battery pack, and the target battery pack supplies power to the battery pack system according to the power supply control instruction, so that the battery pack system is prevented from being powered down, and the reliability of the battery pack system is improved. Of course, the target battery pack may also supply power to the external device.
In this step, the target battery pack may be dynamically updated. For example, the target battery packs are selected at intervals of a preset time, and the selected target battery packs may be different. Therefore, the power supply control instruction can be sent to different target battery packs, so that the different target battery packs are instructed to supply power for the battery pack system in a rotating mode, overdischarge caused by continuous discharge of single battery packs is avoided, and the reliability and safety of the battery pack system are improved.
According to the power supply control method provided by the embodiment, the battery packs to be selected are determined according to the charge state information and the discharge state information of the battery packs, the target battery pack with power supply capacity is selected from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected, and then the power supply control instruction is sent to the target battery pack so as to enable the target battery pack to be powered on, so that standby power consumption of the battery pack system is maintained, power failure of the battery pack system can be avoided, overdischarge caused by continuous discharge of the battery packs due to a power supply mode of a single battery can be avoided, and reliability and safety of the battery pack system are improved.
Referring to fig. 4, fig. 4 is a schematic flow chart of steps of another control method according to an embodiment of the application.
As shown in fig. 4, the control method includes steps S201 to S204.
Step S201, acquiring charge state information and discharge state information of a plurality of battery packs.
Wherein the charge state information includes charge normality and charge error, and the discharge state information includes discharge normality and discharge error. The charge state information and the discharge state information of the plurality of battery packs may be acquired simultaneously.
In an embodiment, the charge state information of the battery pack may be determined according to a charge flag bit of the battery pack. For example, acquiring charging flag bits of a plurality of battery packs; the charging zone bit comprises a first charging zone bit and a second charging zone bit, wherein the first charging zone bit is used for representing that a battery pack has a charging error, and the second charging zone bit is used for representing that the battery pack does not have the charging error. Therefore, the charging state information of the battery pack can be accurately obtained through the charging zone bit of the battery pack.
Illustratively, the first charge flag bit is 0 and the second charge flag bit is 1. When the battery pack has a charging error, the charging flag chg_ready of the battery pack is 0. When the battery pack has no charging error, the charging flag chg_ready of the battery pack is 1. If all the battery packs are determined to have charging errors, the chargeable flag chg_ready of all the battery packs is all 0.
In an embodiment, the discharging state information of the battery pack may be determined according to a discharging flag bit of the battery pack. For example, acquiring discharge flag bits of a plurality of battery packs; the discharging zone bit comprises a first discharging zone bit and a second discharging zone bit, wherein the first discharging zone bit is used for representing that the battery pack has a discharging error, and the second discharging zone bit is used for representing that the battery pack does not have the discharging error. The discharging state information of the battery pack can be accurately obtained through the discharging zone bit of the battery pack.
Illustratively, the first discharge flag bit is 0 and the second discharge flag bit is 1. When the battery pack has a discharge error, the discharge flag chg_ready of the battery pack is 0. When the battery pack has no discharge error, the discharge flag chg_ready of the battery pack is 1. If it is determined that all the battery packs have discharge errors, the dischargeable flag chg_ready of all the battery packs is all 0.
In step S202, when the charge status information of the plurality of battery packs is a charge error, a battery pack whose discharge status information is normal is determined as a battery pack to be selected from the plurality of battery packs.
When the battery pack system is in a charging state, the battery packs have the problems of over-charging, low-temperature protection, overheat protection and the like, so that the charging state information of the battery packs can be a charging error.
When the charging state information of the battery packs is a charging error, the battery pack with normal discharging state information is determined from the battery packs as the battery pack to be selected, so that the problems that the battery packs in the battery pack system report the wrong charging overcurrent and the like at the same time can be prevented, the battery packs with low electric quantity are prevented from being cut off or from being cut off, and the reliability and the safety of the battery pack system can be improved.
In an exemplary embodiment, when the charging flag bits of the plurality of battery packs are all first charging flag bits for indicating that the battery packs have charging errors, it is determined that the charging state information of the plurality of battery packs are all charging errors. At this time, a second discharge flag bit for indicating that the battery pack has no discharge error is determined from the discharge flag bits of the plurality of battery packs, and a battery pack corresponding to the second discharge flag bit is determined from the plurality of battery packs as a battery pack to be selected.
And step 203, selecting a target battery pack from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected.
In one embodiment, the electrical energy parameter comprises a voltage value. Acquiring a voltage value of a battery pack to be selected; determining a maximum voltage value from the voltage values of the battery packs to be selected; and determining the battery pack to be selected corresponding to the maximum voltage value as a target battery pack. The battery pack comprises a battery cell module, and the voltage value of the battery pack to be selected can be the voltage value of the battery cell module. The voltage value of the battery cell module can be directly acquired by the energy management system EMS, or can be output to the energy management system EMS after the voltage value of the battery cell module is acquired by the voltage sampling circuit.
The battery packs to be selected include a battery pack S having a voltage value of 2.4V and a battery pack D having a voltage value of 3V, for example. When the maximum voltage value is 3V, which is determined from the voltage values of the battery packs S and D, the battery pack D corresponding to the 3V is determined as the target battery pack.
In one embodiment, the electrical energy parameter comprises an SOC value; acquiring an SOC value of a battery pack to be selected; determining a maximum SOC value from the SOC values of the battery packs to be selected; and determining the battery pack to be selected corresponding to the maximum SOC value as a target battery pack. The SOC value of the battery pack to be selected may be obtained in real time by the energy management system EMS, or may be calculated by an ampere-hour integration method or the like.
Illustratively, the battery packs to be selected include a battery pack S having an SOC value of 30% and a battery pack D having an SOC value of 20%. When the maximum SOC value is determined to be 30% from the SOC values of the battery packs S and D, the battery pack S corresponding to 30% is determined to be the target battery pack.
Step S204, a power supply control instruction is sent to the target battery pack to enable the target battery pack.
And sending a power supply control instruction to the target battery pack, so that the target battery pack is indicated to supply power to the battery pack system, and the battery pack system can be prevented from being powered down. It should be noted that the target battery pack may be updated. After the target battery pack supplies power for the battery pack system for a period of time, the condition that the electric energy of the target battery pack is insufficient can be caused, so that the power supply of the target battery pack for the battery pack system can be redetermined, different target battery packs are instructed to alternately supply power for the battery pack system, and overdischarge caused by continuous discharge of a single battery pack is avoided. Of course, the target battery pack may also supply power to the external device.
In one embodiment, the target battery pack includes a discharge switch tube for controlling the on-off of a discharge loop of the target battery pack. The power supply control instruction can be sent to a discharge switch tube of the target battery pack, and the discharge switch tube of the target battery pack is conducted after receiving the power supply control instruction, so that a discharge loop of the target battery pack is conducted, and the target battery pack can be output to an anode end P+ and a cathode end P-of the direct current bus through the discharge switch tube to supply power to other battery packs in the battery pack system.
According to the control method provided by the embodiment, the charging state information and the discharging state information of the battery packs are obtained, when the charging state information of the battery packs is a charging error, the battery packs with normal discharging state information are determined from the battery packs to be used as the battery packs to be selected, and the target battery packs are selected from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected, so that the target battery packs are started, different target battery packs can be instructed to supply power for the battery pack system in a rotating manner, standby power consumption of the battery pack system can be maintained, power failure of the battery pack system can be avoided, and meanwhile overdischarge caused by continuous discharging of the battery packs due to a single power supply mode can be avoided, so that reliability and safety of the battery pack system are improved.
Referring to fig. 5, fig. 5 is a schematic flow chart of steps of another control method according to an embodiment of the application.
As shown in fig. 5, the control method includes steps S301 to S304.
Step S301, acquiring charge state information and discharge state information of a plurality of battery packs.
Wherein the charge state information includes charge normality and charge error, and the discharge state information includes discharge normality and discharge error. The charge state information and the discharge state information of the plurality of battery packs may be acquired simultaneously.
In one embodiment, a charging flag bit of a plurality of battery packs is obtained; the charging zone bit comprises a first charging zone bit and a second charging zone bit, wherein the first charging zone bit is used for representing that a battery pack has a charging error, and the second charging zone bit is used for representing that the battery pack does not have the charging error.
In one embodiment, a discharge flag bit of a plurality of battery packs is obtained; the discharging zone bit comprises a first discharging zone bit and a second discharging zone bit, wherein the first discharging zone bit is used for representing that the battery pack has a discharging error, and the second discharging zone bit is used for representing that the battery pack does not have the discharging error.
In step S302, when the discharging state information of the plurality of battery packs is a discharging error, a battery pack whose charging state information is normal is determined as a battery pack to be selected from the plurality of battery packs.
When the battery pack system is in a discharging state, the battery packs have the problems of over-discharge, under-discharge, low-temperature protection, overheat protection and the like, so that the discharging state information of the battery packs can be a discharging error.
When the discharging state information of the plurality of battery packs is a discharging error, the battery pack with the charging state information being normal is determined from the plurality of battery packs as a battery pack to be selected, so that the problems that the plurality of battery packs in the battery pack system report the wrong discharging overcurrent and the like at the same time can be prevented, the situation that the battery pack is cut into a low-battery pack or the battery pack is cut out of the right time can be avoided, and the reliability and the safety of the battery pack system can be improved.
For example, when the discharge flag bits of the plurality of battery packs are the first discharge flag bits for indicating that the battery packs have discharge errors, it is determined that the discharge state information of the plurality of battery packs are all discharge errors. At this time, a second charging flag bit for indicating that the battery pack has no charging error is determined from the charging flag bits of the plurality of battery packs, and a battery pack corresponding to the second charging flag bit is determined from the plurality of battery packs as a battery pack to be selected.
Step S303, selecting a target battery pack from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected.
In one embodiment, the electrical energy parameter comprises a current value. Acquiring a current value of a battery pack to be selected; determining a maximum current value from the current values of the battery packs to be selected; and determining the battery pack to be selected corresponding to the maximum current value as a target battery pack.
In one embodiment, the power parameter includes a remaining power; obtaining the residual electric quantity of a battery pack to be selected; determining the maximum residual capacity from the residual capacity of the battery pack to be selected; and determining the battery pack to be selected corresponding to the maximum residual electric quantity as a target battery pack.
Step S304, a power supply control instruction is sent to the target battery pack so as to enable the target battery pack.
And sending a power supply control instruction to the target battery pack, so that the target battery pack is indicated to supply power to the battery pack system, and the battery pack system can be prevented from being powered down. It should be noted that, the target battery pack may be redetermined to supply power to the battery pack system, so as to instruct different target battery packs to alternately supply power to the battery pack system, so as to avoid overdischarge caused by continuous discharge of the single battery pack. Of course, the target battery pack may also supply power to the external device.
In one embodiment, the battery pack includes a battery cell module. The power supply control method further includes: acquiring a discharge parameter of a battery cell module of a target battery pack; and when the discharge parameter of the battery cell module is greater than or equal to the preset discharge parameter, outputting a turn-off control instruction to the target battery pack, wherein the turn-off control instruction is used for indicating the target battery pack to stop supplying power to the battery pack system.
The discharge parameters of the cell module of the target battery pack may be collected by the energy management system EMS. The preset discharge parameter may be set according to practical situations, for example, 200mA. The stopping of the power supply to the battery pack system by the target battery pack may be achieved by opening a discharge switching tube of the target battery pack.
It should be noted that, when the target battery pack supplies power to the battery pack system, the discharge switch tube in the target battery pack is turned on. However, since the target battery pack is selected under the condition that the discharge state information of the plurality of battery packs is in a discharge error, the power supply of the target battery pack only meets the standby power consumption of the battery pack system, for example, the power supply range is within [ -200mA,200mA ].
Therefore, when the discharge parameter of the battery cell module is greater than or equal to the preset discharge parameter, the energy management system EMS is insufficient to supply power to the external device connected to the dc bus, and needs to instruct the target battery pack to stop supplying power to the battery pack system, for example, to control the discharge switch tube of the target battery pack with a discharge error to be disconnected, so as to avoid overdischarge of the battery pack.
In an embodiment, after the shutdown control command is output to the target battery pack, the step of acquiring the charge state information and the discharge state information of the plurality of battery packs may be continuously performed to redetermine the target battery pack to supply power to the battery pack system.
In one embodiment, when detecting that the battery pack system is not connected with a charger, timing the time after the discharge switch tubes of all the battery packs in the battery pack system are disconnected; and outputting a shutdown instruction after the timing time is greater than or equal to the preset time, wherein the shutdown instruction is used for indicating the shutdown of the battery pack system.
It should be noted that, when the battery pack system is not connected with the charger, the plurality of battery packs in the battery pack system cannot be charged, so that after the discharge switch tubes of all the battery packs in the battery pack system are disconnected for a preset time, a shutdown instruction is output to control the battery pack system to shutdown, thereby avoiding standby power consumption.
According to the control method provided by the embodiment, the charging state information and the discharging state information of the battery packs are obtained, when the discharging state information of the battery packs is a discharging error, the battery packs with the charging state information being normal in charging are determined from the battery packs to serve as battery packs to be selected, and the target battery packs are selected from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected, so that the target battery packs are started, different target battery packs can be instructed to be alternately used for supplying power for the battery pack system, standby power consumption of the battery pack system is maintained, power failure of the battery pack system is avoided, and meanwhile overdischarge caused by continuous discharging of the battery packs due to the adoption of a single power supply mode is avoided, so that reliability and safety of the battery pack system are improved.
Referring to fig. 6, fig. 6 is a schematic block diagram illustrating a battery pack system according to an embodiment of the present application.
As shown in fig. 6, the battery pack system 400 includes a plurality of battery packs 410, with the positive electrode of each battery pack 410 being connected to the positive terminal p+ of the dc bus 40 and the negative electrode of each battery pack 410 being connected to the negative terminal P-of the dc bus 40. The battery pack 410 includes an energy management system for implementing the power supply control method of any one of the embodiments of the present application.
It will be appreciated by those skilled in the art that the structure shown in fig. 6 is merely a block diagram of a portion of the structure associated with the present inventive arrangements and is not limiting of the battery pack system 400 to which the present inventive arrangements are applied, and that a particular battery pack system 400 may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
Wherein, the energy management system is used for realizing the following steps:
acquiring charge state information and discharge state information of a plurality of battery packs;
determining a battery pack to be selected from a plurality of battery packs according to the charge state information and the discharge state information of the plurality of battery packs;
selecting a target battery pack from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected;
and sending a power supply control instruction to the target battery pack so as to enable the target battery pack.
In one embodiment, the energy management system is configured to, when implementing the determination of the battery pack to be selected from the plurality of battery packs according to the charge state information and the discharge state information of the plurality of battery packs, implement:
and when the charge state information of the battery packs is a charge error, determining that the discharge state information is a battery pack with normal discharge from the battery packs as a battery pack to be selected.
In one embodiment, the energy management system is configured to, when implementing the determination of the battery pack to be selected from the plurality of battery packs according to the charge state information and the discharge state information of the plurality of battery packs, implement:
and when the discharging state information of the battery packs is a discharging error, determining the battery pack with the charging state information being normal in charging from the battery packs as a battery pack to be selected.
In one embodiment, the energy management system is further configured to implement:
acquiring a discharge parameter of an electric core of the target battery pack;
and when the discharge parameter of the battery cell is greater than or equal to a preset discharge parameter, outputting a turn-off control instruction to the target battery pack, wherein the turn-off control instruction is used for indicating the target battery pack to stop supplying power to the battery pack system.
In one embodiment, the energy management system, when implementing obtaining the charge state information of a plurality of the battery packs, is configured to implement:
acquiring a plurality of charging zone bits of the battery packs; the charging zone bit comprises a first charging zone bit and a second charging zone bit, wherein the first charging zone bit is used for representing that a battery pack has a charging error, and the second charging zone bit is used for representing that the battery pack does not have the charging error.
In one embodiment, the energy management system, when implementing obtaining discharge state information of a plurality of said battery packs, is configured to implement:
acquiring a plurality of discharge zone bits of the battery packs; the discharging zone bit comprises a first discharging zone bit and a second discharging zone bit, wherein the first discharging zone bit is used for representing that the battery pack has discharging errors, and the second discharging zone bit is used for representing that the battery pack does not have discharging errors.
In one embodiment, the electrical energy parameter comprises a voltage value; and when the energy management system realizes that the target battery pack is selected from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected, the energy management system is used for realizing:
acquiring a voltage value of the battery pack to be selected;
determining a maximum voltage value from the voltage values of the battery packs to be selected;
and determining the battery pack to be selected corresponding to the maximum voltage value as the target battery pack.
In one embodiment, the electrical energy parameter comprises an SOC value; and when the energy management system realizes that the target battery pack is selected from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected, the energy management system is used for realizing:
acquiring the SOC value of the battery pack to be selected;
determining a maximum SOC value from the SOC values of the battery packs to be selected;
and determining the battery pack to be selected corresponding to the maximum SOC value as the target battery pack.
It should be noted that, for convenience and brevity of description, the specific operation process of the battery pack system 400 described above may refer to the corresponding process in the foregoing power supply control method embodiment, which is not described herein again.
Referring to fig. 7, fig. 7 is a schematic block diagram of an energy storage device according to an embodiment of the present application.
As shown in fig. 7, the energy storage device 500 includes: the charging and discharging interface 510 and the direct current bus 520, the charging and discharging interface 510 is used for connecting external equipment. The energy storage device 500 further includes a battery pack system 530, where the battery pack system 530 is connected to the charge-discharge interface 510 via a dc bus 520.
The external equipment can comprise power supply equipment such as commercial power, energy storage equipment, a solar power generation system, a wind power generation system and the like, and also can comprise electric equipment such as a household air conditioner, an outdoor air conditioner, a washing machine, a water heater, a mower and the like. The battery pack system 530 is used for discharging an external device or receiving an electrical signal input from the external device to charge.
In some embodiments, the battery pack system 530 may be the battery pack system 400 of the previous embodiments. In some embodiments, the energy storage device 500 may further be provided with circuit units such as an inverter circuit, a rectifier circuit, a voltage conversion circuit, a voltage stabilizing circuit, a power supply circuit, and the like.
It should be noted that, for convenience and brevity of description, the specific working process of the energy storage device 500 described above may refer to the corresponding process in the foregoing power supply control method embodiment, which is not described herein again.
Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.

Claims (10)

1. A control method of a battery pack system, characterized in that the battery pack system includes a plurality of battery packs; the control method comprises the following steps:
acquiring charge state information and discharge state information of a plurality of battery packs;
determining a battery pack to be selected from a plurality of battery packs according to the charge state information and the discharge state information of the plurality of battery packs;
selecting a target battery pack from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected;
and sending a power supply control instruction to the target battery pack so as to enable the target battery pack.
2. The control method according to claim 1, wherein the determining a battery pack to be selected from among the plurality of battery packs based on the charge state information and the discharge state information of the plurality of battery packs includes:
and when the charge state information of the battery packs is a charge error, determining that the discharge state information is a battery pack with normal discharge from the battery packs as a battery pack to be selected.
3. The control method according to claim 1 or 2, characterized in that the determining a battery pack to be selected from among the plurality of battery packs based on charge state information and discharge state information of the plurality of battery packs includes:
and when the discharging state information of the battery packs is a discharging error, determining the battery pack with the charging state information being normal in charging from the battery packs as a battery pack to be selected.
4. A control method according to claim 3, characterized in that the power supply control method further comprises:
acquiring discharge parameters of a battery cell module in the target battery pack;
and outputting a turn-off control instruction to the target battery pack when the discharge parameter of the battery cell module is greater than or equal to a preset discharge parameter, wherein the turn-off control instruction is used for turning off the target battery pack.
5. The control method according to claim 1, wherein acquiring charge state information of a plurality of the battery packs includes:
acquiring a plurality of charging zone bits of the battery packs; the charging zone bit comprises a first charging zone bit and a second charging zone bit, wherein the first charging zone bit is used for representing that a battery pack has a charging error, and the second charging zone bit is used for representing that the battery pack does not have the charging error.
6. The control method according to claim 1, wherein acquiring discharge state information of a plurality of the battery packs includes:
acquiring a plurality of discharge zone bits of the battery packs; the discharging zone bit comprises a first discharging zone bit and a second discharging zone bit, wherein the first discharging zone bit is used for representing that the battery pack has discharging errors, and the second discharging zone bit is used for representing that the battery pack does not have discharging errors.
7. The control method according to claim 1, characterized in that the electric energy parameter comprises a voltage value;
wherein, according to the electric energy parameter of the battery pack to be selected, selecting a second battery pack from the battery packs to be selected, including:
acquiring a voltage value of the battery pack to be selected;
determining a maximum voltage value from the voltage values of the battery packs to be selected;
and determining the battery pack to be selected corresponding to the maximum voltage value as the target battery pack.
8. The control method according to claim 1, characterized in that the electric energy parameter includes an SOC value;
the selecting a target battery pack from the battery packs to be selected according to the electric energy parameters of the battery packs to be selected comprises the following steps:
acquiring the SOC value of the battery pack to be selected;
determining a maximum SOC value from the SOC values of the battery packs to be selected;
and determining the battery pack to be selected corresponding to the maximum SOC value as the target battery pack.
9. A battery pack system, characterized in that the battery pack system comprises a plurality of battery packs, the battery packs comprising an energy management system for implementing the control method according to any one of claims 1 to 8.
10. An energy storage device, the energy storage device comprising:
the charging and discharging interface is used for connecting external equipment;
the battery pack system of claim 9, coupled to the charge-discharge interface.
CN202310594674.8A 2023-05-24 2023-05-24 Control method, battery pack system and energy storage device Pending CN116865372A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310594674.8A CN116865372A (en) 2023-05-24 2023-05-24 Control method, battery pack system and energy storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310594674.8A CN116865372A (en) 2023-05-24 2023-05-24 Control method, battery pack system and energy storage device

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