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CN116365652A - Battery pack control method, battery pack and energy storage device - Google Patents

Battery pack control method, battery pack and energy storage device Download PDF

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Publication number
CN116365652A
CN116365652A CN202310341396.5A CN202310341396A CN116365652A CN 116365652 A CN116365652 A CN 116365652A CN 202310341396 A CN202310341396 A CN 202310341396A CN 116365652 A CN116365652 A CN 116365652A
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CN
China
Prior art keywords
discharge
cell module
voltage
battery pack
battery cell
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
CN202310341396.5A
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Chinese (zh)
Inventor
胡耀华
吴东
陈熙
王雷
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Ecoflow Technology Ltd
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Ecoflow Technology Ltd
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Filing date
Publication date
Application filed by Ecoflow Technology Ltd filed Critical Ecoflow Technology Ltd
Priority to CN202310341396.5A priority Critical patent/CN116365652A/en
Publication of CN116365652A publication Critical patent/CN116365652A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • 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
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • 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
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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

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

Abstract

The application provides a battery pack control method, a battery pack and energy storage equipment, wherein the method comprises the following steps: determining the pre-shutdown voltage of the battery cell module through the discharge parameter of the battery cell module and the undervoltage protection voltage of the battery cell module; acquiring the current cell voltage of the cell module, and calculating the voltage difference between the pre-shutdown voltage and the current cell voltage; determining the pre-discharge time length of the battery pack according to the rated full-load electric quantity, the discharge parameter and the voltage difference value of the battery cell module; based on the pre-discharge time length, a control instruction is output, and the control instruction is used for indicating the battery cell module to discharge according to the target discharge parameters after the pre-discharge time length. The method can avoid data loss of the electronic equipment caused by the fact that the battery pack stops supplying power.

Description

Battery pack control method, battery pack and energy storage device
Technical Field
The application relates to the technical field of battery packs, in particular to a battery pack control method, a battery pack and energy storage equipment.
Background
The State of Charge (SOC) is an important parameter describing the running State of the battery pack, and in the discharging process of the battery pack, the SOC of the battery pack is continuously reduced along with the decrease of the remaining capacity of the battery cell module, so that a user can judge the remaining capacity of the battery cell module through the SOC of the battery pack, thereby facilitating the control and management of the electric quantity.
However, when the battery pack is connected with the electronic device to perform power supply output, if the SOC of the battery pack is discharged to 0%, the battery pack immediately stops outputting, so that the electronic device is immediately powered down, and the data is lost without being stored, which is not beneficial to the use of the electronic device.
Disclosure of Invention
The main purpose of the application is to provide a battery pack control method, a battery pack and energy storage equipment, and aims to solve the problem that data loss exists in electronic equipment connected with the battery pack.
In a first aspect, the present application provides a battery pack control method, where the battery pack includes a battery cell module, and the battery pack is used to connect to and supply power to an electronic device, and the method includes:
acquiring discharge parameters, rated full-load electric quantity and undervoltage protection voltage of the battery cell module;
determining a pre-shutdown voltage of the battery cell module according to the discharge parameter of the battery cell module and the under-voltage protection voltage of the battery cell module, wherein the pre-shutdown voltage is larger than the under-voltage protection voltage, and the SOC value of the battery pack under the pre-shutdown voltage is a set minimum SOC value;
acquiring the current cell voltage of the cell module, and calculating a voltage difference value between the pre-shutdown voltage and the current cell voltage;
Determining the pre-discharge duration of the battery pack according to the rated full-load electric quantity of the battery cell module, the discharge parameter and the voltage difference value;
outputting a control instruction based on the pre-discharge time length; the control instruction is used for indicating the cell module to discharge according to a target discharge parameter after the pre-discharge duration.
In a second aspect, the present application also provides a battery pack, the battery pack comprising:
a battery cell module;
and the battery management system is connected with the battery cell module and is used for realizing the battery pack control method according to the embodiment of the application.
In a third aspect, the present application also provides an energy storage device comprising:
the output interface is used for connecting the electronic equipment;
the battery pack is connected with the output interface and is used for supplying power for the electronic equipment.
The embodiment of the application provides a battery pack control method, a battery pack and energy storage equipment. According to the battery pack control method, the pre-shutdown voltage of the battery cell module is determined through the discharge parameter of the battery cell module and the under-voltage protection voltage of the battery cell module, wherein when the voltage of the battery cell module is the pre-shutdown voltage, the SOC value of the battery pack is the set minimum SOC value. The method comprises the steps of obtaining the current cell voltage of a cell module and calculating a voltage difference value between the pre-shutdown voltage and the current cell voltage; determining the pre-discharge time length of the battery pack according to the rated full-load electric quantity, the discharge parameter and the voltage difference value of the battery cell module; outputting a control instruction based on the pre-discharge time length; the control instruction is used for indicating the battery cell module to discharge according to the target discharge parameter after the pre-discharge time.
Therefore, when the battery pack is connected with the electronic equipment to carry out power supply output, the scheme can adjust the pre-shutdown voltage according to the real-time discharge parameter, so that the battery pack can adjust the SOC value to the set minimum SOC value in advance. Meanwhile, the pre-discharge time length is calculated according to the pre-shutdown voltage and other parameters of the battery cell module, and a control instruction is output based on the pre-discharge time length, so that the battery cell module discharges according to the target discharge parameters after the pre-discharge time length. Therefore, the battery pack can still provide the target discharge parameters required by the data storage operation for the electronic equipment at the minimum SOC value instead of directly powering down and powering down, so that the problem that the data of the electronic equipment is lost without storage can be avoided. After the pre-discharge time, the electronic equipment can execute data storage operation by utilizing the target discharge parameters provided by the battery pack, thereby being beneficial to the use of the electronic equipment and avoiding the problem of data loss.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced 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 battery pack control method according to an embodiment of the present application;
fig. 2 is another application scenario diagram of the battery pack control method provided in the embodiment of the present application;
fig. 3 is a schematic flow chart of steps of a battery pack control method according to an embodiment of the present application;
fig. 4 is a flowchart illustrating steps of another battery pack control method according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of steps of another battery pack 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 realization, functional characteristics and advantages of the present application will be further described with reference to the embodiments, referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; it will be apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
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 battery pack control method according to an embodiment of the present application. As shown in fig. 1, the battery pack control method is applicable to a battery pack 10, the battery pack 10 includes a battery cell module 11 and a battery management system 12 (Battery Management System, BMS), the battery cell module 11 and the battery management system 12 are electrically connected, and the battery pack control method is particularly applicable to the battery management system 12.
The battery pack 10 is used for connecting with an electronic device, such as an energy storage device 20, and the battery pack 10 is used for supplying power to functional modules in the energy storage device 20. The battery pack 10 may be provided outside the energy storage device 20, and the two are connected through a power supply line. The battery pack 10 may also be disposed inside the energy storage device 20, which is not particularly limited in this embodiment.
Fig. 2 is another application scenario diagram of the battery pack control method provided in the embodiment of the present application. As shown in fig. 2, the battery pack control method is applicable to the battery pack 10, the battery pack 10 includes a battery cell module 11 and a battery management system 12 (Battery Management System, BMS), the battery cell module 11 and the battery management system 12 are electrically connected, and the battery pack control method is particularly applicable to the battery management system 12.
The battery pack 10 is disposed inside the energy storage device 20, and is capable of supplying power to functional modules in the energy storage device 20, where the functional modules may include circuit units such as a main control circuit, an inverter circuit, a rectifying circuit, a voltage conversion circuit, a voltage stabilizing circuit, and a power supply circuit. The battery pack 10 is used for connecting electronic equipment, such as electric equipment 30, and the battery pack 10 can supply power to the electric equipment 30, and the electric equipment 30 can comprise a household air conditioner, an outdoor air conditioner, a washing machine, a water heater, a mower and the like.
Referring to fig. 3, fig. 3 is a schematic step flow diagram of a battery pack control method according to an embodiment of the present application, where the battery pack control method includes:
s101, acquiring discharge parameters, rated full-load electric quantity and undervoltage protection voltage of the battery cell module.
In this step, the battery pack may include one or more battery cells, and the battery cell module is composed of one or more battery cells. The discharge parameter of the cell module may be a parameter related to the discharge electrical signal commonly output by one or more cells. The battery pack is used to connect and power electronic devices, which may include, but are not limited to, energy storage devices and powered devices.
In this step, the discharge parameters may include parameters such as a discharge current, a discharge voltage, a discharge power, a discharge capacity, a discharge load value, and the like. The discharge current, discharge voltage and discharge power may be the current value, voltage value and power value currently output by the cell module, respectively. The discharging electric quantity can be an electric quantity value output by the power supply of the battery cell module to the electronic equipment, and the discharging load value can be a resistance value of the electronic equipment connected with the battery cell module.
In this step, the discharge parameters of the battery cell module may be collected by the sampling circuit and transmitted to the battery management system BMS. For example, the discharge current may be collected by a current sampling circuit and the discharge voltage may be collected by a voltage sampling circuit.
In this step, the discharge parameters of the battery cell module may be calculated by the battery management system BMS. For example, the battery management system BMS may obtain a discharge current and a discharge voltage, and calculate a discharge power or a discharge amount by the discharge current and the discharge power.
In this step, the discharge parameters of the battery cell module may also be transmitted from the electronic device to the battery management system BMS. For example, the discharge load value may be transmitted to the battery management system BMS by the electronic device.
In this step, the cell module is provided with an under-voltage protection voltage. When the voltage of the battery cell module is smaller than or equal to the undervoltage protection voltage, the undervoltage protection is triggered, the output of the battery cell module is disconnected, namely, the battery management system BMS controls the discharge switch tube on the discharge loop of the battery cell module to be turned off. In this step, the rated full charge may be the rated charge value of the cell module when full. The undervoltage protection voltage and rated full load capacity of the battery cell module may be preset in the battery management system BMS.
S102, determining the pre-shutdown voltage of the battery cell module according to the discharge parameter of the battery cell module and the undervoltage protection voltage of the battery cell module.
In this step, the battery cell module is further provided with a pre-shutdown voltage, the pre-shutdown voltage is greater than the under-voltage protection voltage, and the SOC value of the battery pack at the pre-shutdown voltage is a set minimum SOC value. The minimum SOC value may be a default value, for example, 0%.
In the step, the pre-shutdown voltage is determined in real time according to the discharge parameter and the under-voltage protection voltage of the battery cell module. The pre-shutdown voltage may be set to a minimum value, and the minimum value of the pre-shutdown voltage may be higher than the under-voltage protection voltage by a preset value, for example, 0.5V or 1V. For example, the under-voltage protection voltage of the battery may be 3V and the pre-shutdown voltage may be 3.2V.
S103, the current cell voltage of the cell module is obtained, and a voltage difference value between the pre-shutdown voltage and the current cell voltage is calculated.
In this step, the cell module may include a plurality of cells, and different cell voltages may be the same or have a deviation within a certain range. In this step, the current cell voltage of the cell module may be the lowest cell voltage among all the cell voltages, so as to ensure that the problem of undervoltage caused by overdischarge does not occur in all the cells.
In this step, the battery pack may include multiple voltage sampling circuits, each of which is correspondingly connected to a battery cell in the battery cell module, and the multiple voltage sampling circuits are further connected to the battery management system BMS. The voltage sampling circuit is used for collecting the current cell voltages of a plurality of cells in the cell module and transmitting the current cell voltages to the battery management system BMS.
In this step, after the battery management system BMS obtains the pre-shutdown voltage V and the current cell voltage V1 of the cell module, calculates a voltage difference (V-V1) between the pre-shutdown voltage V and the current cell voltage V1.
S104, determining the pre-discharge time length of the battery pack according to the rated full-load electric quantity, the discharge parameter and the voltage difference value of the battery cell module.
In this step, the rated full charge may be the rated charge value of the full charge of the cell module, and the voltage difference refers to the voltage difference between the pre-shutdown voltage and the current cell voltage. In this step, the rated full charge is unchanged, and the discharge parameter and the voltage difference vary with the discharge process of the cell module.
In the step, the pre-discharge time of the battery pack can be accurately predicted according to the rated full-load electric quantity, the discharge parameter and the voltage difference value of the battery cell module. After the discharging time of the battery pack reaches the pre-discharging time, the voltage difference between the pre-shutdown voltage and the current cell voltage is 0, and the battery pack is expected to cut off the power supply to the electronic equipment.
S105, outputting a control instruction based on the pre-discharge time, wherein the control instruction is used for indicating the battery cell module to discharge according to the target discharge parameters after the pre-discharge time.
In this step, the battery management system BMS can generate a control command based on the pre-discharge time period and output the control command to the cell module, so as to control the cell module to discharge according to the target discharge parameter after the pre-discharge time period, instead of directly powering down and shutting down.
For example, when the electric quantity of the battery cell module is sufficient, in order to ensure the normal operation of the electronic device, the discharge current of the battery cell module may be 10A. After the battery pack is continuously discharged for a pre-discharge time, the electric quantity of the battery cell module is insufficient, and the risk of under-voltage power failure exists. Therefore, when the pre-discharge time is obtained, the embodiment of the application indicates the battery cell module to discharge according to the target discharge parameters after the pre-discharge time by outputting the control instruction through the pre-discharge time. The target discharge parameter is, for example, a target discharge current 0.1A, and the target discharge current 0.1A can support the electronic device to execute the data saving operation, so that the problem of data loss of the electronic device can be avoided.
According to the battery pack control method provided by the embodiment, the SOC value can be adjusted to the set minimum SOC value in advance by calculating the pre-shutdown voltage and the pre-discharge time length of the battery cell module in real time. Meanwhile, the battery pack can reserve partial electric quantity when the minimum SOC value is reached, and power is supplied to the electronic equipment according to the target discharging parameter, so that the power consumption requirement of the electronic equipment for executing data storage operation is met, and the problem of data loss of the electronic equipment due to the fact that the battery pack stops supplying power is avoided.
Referring to fig. 4, fig. 4 is a flowchart illustrating steps of another battery pack control method according to an embodiment of the present disclosure.
As shown in fig. 4, the battery pack control method includes steps S201 to S207.
Step 201, obtain the discharge parameters, rated full-load power, and under-voltage protection voltage of the battery cell module.
The battery cell module can comprise one or more battery cells, and the discharge parameters can comprise parameters such as discharge current, discharge voltage, discharge power, discharge electric quantity, discharge load value and the like.
In one embodiment, a current SOC of the battery cell module is obtained; and when the current SOC is smaller than or equal to a preset SOC threshold value, acquiring the discharge parameters, rated full-load electric quantity and undervoltage protection voltage of the battery cell module. The current SOC obtaining method may be a conventional ampere-hour integrating method. The preset SOC threshold may be determined according to practical situations, for example, 5%. When the current SOC of the battery core module is smaller than or equal to a preset SOC threshold, the battery core module has the risk of under-voltage power failure, so that the discharge parameters, rated full-load electric quantity and under-voltage protection voltage of the battery core module are acquired, and subsequent operation is performed, and the necessity of subsequently outputting prompt information is ensured.
Illustratively, the preset SOC threshold value is 5%. The battery management system BMS acquires the current SOC of the battery cell module; if the current SOC of the battery cell module is 10%, the step of acquiring the discharge parameter, rated full-load electric quantity and undervoltage protection voltage of the battery cell module is not executed; if the battery cell module is continuously discharged, when the current SOC of the battery cell module is smaller than or equal to 5%, for example, the current SOC of the battery cell module is 4%, the discharge parameters, rated full-load electric quantity and under-voltage protection voltage (for example, discharge current) of the battery cell module are obtained, and subsequent operation is carried out.
In an embodiment, after the SOC of the battery cell module is less than or equal to the preset SOC threshold, if the battery pack is charged so that the current SOC of the battery cell module is greater than the preset SOC threshold, no subsequent steps are required to be performed. It should be noted that, when the current SOC of the battery cell module is greater than the preset SOC threshold, it indicates that the remaining power of the battery cell module is still more, and the battery pack does not immediately stop supplying power, so that no prompt information is required to be output to prompt the electronic device.
Step S202, determining the pre-shutdown voltage of the battery cell module according to the discharge parameter of the battery cell module and the under-voltage protection voltage of the battery cell module.
The pre-shutdown voltage is larger than the under-voltage protection voltage, and the SOC value of the battery pack under the pre-shutdown voltage is a set minimum SOC value. The under-voltage protection voltage may be determined according to the number of the electric cores in the electric core module, the larger the number of the electric cores is, the larger the under-voltage protection voltage is, and the minimum SOC value may be 0% or 2%, for example.
In one embodiment, the discharge parameter includes a discharge current of the cell module. Acquiring a preset adjustment coefficient and an under-voltage protection voltage of the battery cell module, wherein the preset adjustment coefficient is a positive value, and the preset adjustment coefficient is positively related to a target discharge parameter; calculating the product of a preset adjusting coefficient and the discharge current to obtain a second product; and adding the second product and the under-voltage protection voltage to obtain the pre-shutdown voltage of the battery cell module.
It should be noted that, the preset adjustment coefficient is positively correlated with the target discharge parameter, that is, the larger the target discharge parameter is, the larger the preset adjustment coefficient can be set. The pre-shutdown voltage and the under-voltage protection voltage of the battery cell module are related to the battery cell voltage of the battery cell module. When the battery cell voltage of the battery cell module reaches the pre-shutdown voltage, the SOC is adjusted to be a minimum SOC value, for example, 0%, but the battery pack can still supply power for a main control chip of the electronic device, for example, a micro control unit MCU, and the electronic device is not shut down. If the cell voltage of the battery pack is smaller than or equal to the undervoltage protection voltage, the battery pack can immediately close the discharge MOS of the battery pack in order to avoid the damage of the cell, and the battery pack is disconnected and output outwards at the moment, and the connected electronic equipment can be powered down and shut down.
The discharging current and the under-voltage protection voltage of the battery cell module are input into a pre-shutdown voltage calculation formula to obtain the pre-shutdown voltage of the battery cell module. The pre-shutdown voltage calculation formula comprises: v=v0+k1×i, where V represents a pre-shutdown voltage, V0 represents an under-voltage protection voltage, I represents a discharge current, and K1 represents a preset adjustment coefficient. For example, the preset adjustment coefficient K1 may be 0.01. When the under-voltage protection voltage of the battery core is 3.1V and the discharge current is 10A, the obtained pre-shutdown voltage V is 3.2V according to the pre-shutdown voltage calculation formula.
In an embodiment, the preset adjustment coefficient is determined according to a target standby duration, where the target standby duration is used to characterize a duration of the battery pack from the SOC value to the minimum SOC value until the power-off switch is enabled, and the preset adjustment coefficient is positively related to the target standby duration.
It should be noted that the preset adjustment coefficient may be defined according to the shutdown time to be maintained, that is, may be determined according to how long the SOC value is zero and the battery pack can be maintained for a standby time. The longer the standby time that needs to be maintained, the larger the preset adjustment coefficient. Similarly, the preset adjustment coefficient may be defined according to the size of the target discharge parameter, that is, the larger the target discharge parameter is, the larger the preset adjustment coefficient may be set.
For example, when the electronic device is in the recording state or the testing state, the standby time required to be kept is longer, that is, the target standby time is longer, and the preset adjustment coefficient positively correlated to the target standby time is larger. For example, the battery management system BMS receives the recording status indication information sent by the electronic device; when the recording state indication information is used for indicating that the electronic device is in a recording state, a preset adjustment coefficient K1 set by the battery management system BMS may be 0.02; when the recording state indication information is used for indicating that the electronic device is not in the recording state, the preset adjustment coefficient set by the battery management system BMS may be 0.01.
Step S203, the current cell voltage of the cell module is obtained, and the voltage difference between the pre-shutdown voltage and the current cell voltage is calculated.
When the battery cells of the battery cell module are multiple, the current battery cell voltage of the battery cell module can be the lowest battery cell voltage in all battery cell voltages. The voltage difference may be a difference between the pre-shutdown voltage and a lowest cell voltage of all cell voltages.
The voltage difference between the pre-shutdown voltage V and the lowest cell voltage V1 is calculated to be V-V1.
Step S204, determining a first correction coefficient according to the voltage difference, wherein the first correction coefficient is used for correcting the value of the SOC of the battery cell module.
The first correction coefficient is positively related to the pre-shutdown voltage, that is, the larger the pre-shutdown voltage is, the larger the first correction coefficient is, the smaller the value of the corrected SOC is, which indicates that the risk of undervoltage power failure of the battery pack is smaller. The first correction coefficient is also inversely related to the current cell voltage, namely, the larger the current cell voltage is, the smaller the first correction coefficient is, so that the larger the value of the corrected SOC is, and the smaller the risk of undervoltage power failure of the battery pack is.
In one embodiment, a predetermined constant is obtained, the predetermined constant being greater than 0 and less than 1; calculating the product of a preset constant and a voltage difference value; and adding the product of the preset constant and the voltage difference value to 1 to obtain a first correction coefficient. The preset constant may be set according to practical situations, for example, may be 0.5. And adding the product of the preset constant and the voltage difference value to 1, so as to ensure that the first correction coefficient is positively correlated with the pre-shutdown voltage. The first correction coefficient can be accurately calculated through a preset constant and a voltage difference value.
The first correction coefficient calculation formula is obtained, and the voltage difference value is output to the first correction coefficient calculation formula to calculate, so that the first correction coefficient is obtained. The first correction coefficient calculation formula includes k2=1+a× (V-V1), K2 represents the first correction coefficient, a represents a preset constant, and V-V1 represents a voltage difference between the pre-shutdown voltage V and the current cell voltage V1.
Illustratively, the first correction coefficient calculation formula further includes: k2 =1+a× (V-V1) × (i-i ref ). Wherein K2 represents a first correction coefficient, a represents a preset constant greater than zero and less than 1, and V-V1 represents a voltage difference between the pre-shutdown voltage V and the current cell voltage V1. Wherein i represents a discharge current, i ref Representing the reference current. The discharge current i can be the current value output by the cell module, and the reference current i ref May be a reference value for the output current of the cell stack.
It should be noted that the current difference between the discharge current i and the reference current should be positive, so that when the discharge current i is greater than the reference current, the discharge current i and the reference current i are calculated ref The current difference value between the first correction coefficient and the second correction coefficient can ensure that the calculation result of the first correction coefficient cannot be wrong. The current difference i-i ref And substituting the voltage difference value (V-V1) into the formula to calculate, so that the first correction coefficient K2 can be obtained quickly.
In an embodiment, when the current cell voltage of the cell module is greater than the pre-shutdown voltage or the cell module is not in a discharge state, the first correction coefficient is updated to 1. It should be noted that, the working state of the battery pack in the working process is changed, and the battery cell voltage of the battery cell module may be raised due to factors such as the battery cell module being in a charging state or the battery cell module stopping discharging, so that the battery cell voltage is greater than the pre-shutdown voltage, and the phenomenon of under-voltage and power failure of the battery pack cannot occur at the moment. Therefore, when the battery cell voltage is larger than the preset voltage or the battery cell module is not in a discharge state, the correction coefficient is updated to 1, so that the first correction coefficient of the SOC is not required to be calculated according to the voltage difference value between the pre-shutdown voltage and the current battery cell voltage, and the first correction coefficient can be quickly obtained.
Step S205, calculating the value of the SOC according to the rated full charge capacity of the battery cell module, the discharge parameter and the first correction coefficient.
It should be noted that, the first correction coefficient and the value of the SOC may be inversely related, that is, the larger the first correction coefficient is, the faster the value of the corrected SOC decreases along with the discharge of the cell module, so that the corrected SOC value is smaller than the actual SOC value, and thus, the standby time can be reserved for the electronic device. For example, the corrected SOC may be 4%, the actual SOC value may be 5%, and the remaining power may be large when the SOC value is 0%, so that the standby time of the electronic device may be prolonged.
In one embodiment, the discharge parameter includes a discharge power of the battery cell module; calculating the product of the first correction coefficient and the discharge electric quantity to obtain a first product; acquiring rated full-load electric quantity of the battery cell module, and calculating a difference value of the rated full-load electric quantity and a first product to obtain a first difference value; and calculating the quotient between the first difference value and the rated full-load electric quantity to obtain the value of the SOC.
It should be noted that the discharge parameters may also include a discharge current and a discharge time, and the discharge electric quantity of the battery cell module may be calculated according to the discharge current and the discharge time. The SOC value is accurately calculated through the rated full-load electric quantity, the discharge parameter and the first correction coefficient of the battery cell module, so that the SOC value can be adjusted in real time, standby time is reserved for the electronic equipment so as to store data, and data loss of the electronic equipment due to the fact that the battery pack stops supplying power is avoided.
Illustratively, the value of the SOC is calculated according to the rated full charge, the discharged charge, and the first correction factor of the battery cell module using the following formula:
SOC＝(fullcap-K2*∫Idt)/fullcap；
the full cap represents the rated full charge of the battery cell module, the ∈Idt represents the discharge power of the battery cell module, and the K2 represents the first correction coefficient representing the SOC. It should be noted that, the discharging electric quantity of the battery cell module can be obtained by obtaining the integral value of the discharging current of the battery cell module, and substituting the rated full-load electric quantity, the discharging parameter and the first correction coefficient of the battery cell module into the formula to calculate, so that the value of the SOC can be obtained quickly and accurately.
Step S206, according to the value of the SOC and the discharging parameter, the pre-discharging duration of the battery pack is determined.
It should be noted that after the SOC value that can actually discharge is confirmed, the pre-discharge duration of the battery pack can be accurately determined according to the SOC value and the discharge parameter, after the discharge duration of the battery pack reaches the pre-discharge duration, the current cell voltage of the cell module will be equal to the pre-shutdown voltage, and then the voltage difference between the pre-shutdown voltage and the current cell voltage will be 0, at this time, the SOC value of the battery pack is 0%, and the battery pack will disconnect the power supply to the electronic device.
In one embodiment, the discharge parameter includes a discharge power of the cell module; calculating the pre-discharge electric quantity of the battery cell module according to the rated full-load electric quantity and the SOC value of the battery cell module; and calculating the quotient between the pre-discharge electric quantity and the discharge power to obtain the pre-discharge time length of the battery pack.
It should be noted that the discharge parameters may also include a discharge current and a discharge voltage, and the discharge power of the battery cell module may be accurately calculated according to the discharge current and the discharge voltage. The pre-discharge electric quantity can be accurately calculated through the rated full-load electric quantity and the SOC value of the battery cell module, so that the pre-discharge time length of the battery pack can be calculated according to the pre-discharge electric quantity and the discharge power, the SOC value of the battery pack after the pre-discharge time length is 0% for example, but the battery pack is left with the residual electric quantity from the minimum SOC value to the power-off switch capable of using the target standby time length, therefore, the MCU of the electronic equipment can be powered up, the electronic equipment can not be powered down and shut down, the target standby time length is left for the electronic equipment to save data, and the data loss of the electronic equipment due to the fact that the battery pack stops powering up is avoided.
For example, the current dischargeable SOC has a value of 4%, the full capacity is 1000WH, and the corresponding dischargeable electric quantity is 1000×4% =40 WH, assuming that the current discharge voltage is 40V, the discharge current is 10A, the discharge power is 400W, and the pre-discharge period of the battery pack is 40/400=0.1h.
Step S207, based on the pre-discharge time, a control instruction is output, wherein the control instruction is used for indicating the battery cell module to discharge according to the target discharge parameters after the pre-discharge time.
In one embodiment, the target discharge parameter matches a discharge parameter required by the electronic device to perform the data retention operation, such that the electronic device is able to perform the data retention operation based on the target discharge parameter provided by the battery pack. The target discharge parameters may include parameters such as discharge current, discharge voltage, discharge power, etc. Because the electronic device has smaller discharge parameters required for performing the data saving operation, the target discharge parameters of the battery cell module for discharging after the pre-discharge time period are also smaller, for example, the target discharge parameters are 0.1A.
The target discharge parameter may be determined according to a discharge parameter required for the electronic device to perform the data saving operation. The target discharge parameters corresponding to different electronic devices may be the same or different. The target discharging parameter may be preset in the battery management system BMS, or the electronic device may send the target discharging parameter to the battery management system BMS.
It should be noted that the discharge parameter matching may mean that the target discharge parameter is greater than or equal to the discharge parameter required by the electronic device to perform the data saving operation. The discharge parameter being matched may also mean that a difference between the target discharge parameter and a discharge parameter required by the electronic device to perform the data saving operation is less than a preset difference threshold, for example, 0.1A. The discharge parameter matching may also mean that the target discharge parameter is at the same current level, e.g., ten milliamp, hundred milliamp, or amp, as the discharge parameter required by the electronic device to perform the data retention operation.
In an embodiment, the discharge loop of the battery pack is provided with a discharge switching unit comprising a discharge switching tube and a body diode connected in parallel with the discharge switching tube. The battery pack control method further includes: starting timing after the control instruction is output, and obtaining timing time; when the timing time reaches the pre-discharge time length, generating a turn-off instruction of a discharge switch tube; and sending the turn-off instruction to a discharge switching tube, and stopping the discharge switching tube when receiving the turn-off instruction. In this way, the high current output of the battery pack can be shut down, and only the power output through the body diode in the discharge loop is retained, and the discharge parameter of the power output of the body diode is used as the target discharge parameter. The electronic equipment can utilize the target discharge parameters of the electric energy output of the body diode to execute data storage operation, so that the electronic equipment can store data after the pre-discharge time length, and the phenomenon of data loss can not occur.
In one embodiment, the battery pack control method further includes: based on the pre-discharge time, outputting prompt information for prompting the electronic equipment that the battery pack is to be discharged according to the target discharge parameters after the pre-discharge time. It should be noted that, the battery pack is communicatively connected to the electronic device, and the communication connection may be a wired connection or a wireless connection, for example, a connection through a communication bus. The prompt information can be output to the electronic equipment, so that the battery pack of the electronic equipment is prompted to only reserve power for the target discharge parameters available for data storage operation after the pre-discharge time, and the shutdown time is reserved for the electronic equipment, so that the electronic equipment can store data by utilizing the target discharge parameters after the pre-discharge time, and the phenomenon of data loss can not occur.
In an embodiment, the electronic device is configured to receive a prompt message output by the battery pack, and perform data display according to the prompt message. The data display content can comprise the pre-discharge time length of the battery pack, so that a user can know the pre-discharge time length of the battery pack conveniently, and the user can be helped to conduct electricity planning better.
Note that, the prompt information output by the battery pack may further include information such as a discharge parameter and an SOC value of the battery pack. The data display content of the electronic equipment can also comprise information such as discharge parameters, SOC values and the like of the battery pack, so that a user is helped to better grasp the use condition of the battery pack, and the use planning of the battery pack by the user is facilitated.
According to the battery pack control method, the pre-shutdown voltage and the first correction coefficient are calculated in real time to calculate the value of the SOC, and the pre-discharge time of the battery pack is determined by using the corrected value of the SOC, so that the time of providing the target discharge parameter for the electronic equipment by the battery pack can be accurately predicted, the battery pack can supply power to the electronic equipment according to the target discharge parameter when the value of the SOC is the minimum, and the battery pack is not powered off directly, so that the power consumption requirement of the electronic equipment for executing data storage operation can be met, and the data loss of the electronic equipment caused by the fact that the battery pack stops supplying power can be avoided.
Referring to fig. 5, fig. 5 is a flowchart illustrating steps of another battery pack control method according to an embodiment of the present disclosure.
As shown in fig. 5, the battery pack control method includes steps S301 to S307.
Step S301, obtain the discharge parameters, rated full-load power, and under-voltage protection voltage of the battery cell module.
The battery cell module can comprise one or more battery cells, and the discharge parameters can comprise parameters such as discharge current, discharge voltage, discharge power, discharge electric quantity, discharge load value and the like. The undervoltage protection voltage and rated full-load capacity of the battery cell module can be preset in the battery management system BMS.
In one embodiment, the discharge parameter comprises a discharge voltage. Acquiring the discharge voltage of the battery cell module; judging whether the discharge current is smaller than or equal to a preset voltage threshold value; and when the discharge current is smaller than or equal to a preset voltage threshold value, executing the subsequent steps, thereby ensuring the necessity of outputting prompt information subsequently.
In one embodiment, the discharge parameter comprises a discharge capacity. Acquiring the discharge electric quantity of the battery cell module; calculating the difference value between the rated full-load electric quantity and the discharge electric quantity of the battery cell module to obtain the residual electric quantity of the battery cell module; and when the residual electric quantity of the battery cell module is smaller than or equal to the preset residual electric quantity, executing the subsequent steps, thereby ensuring the necessity of outputting prompt information subsequently.
Step S302, determining the pre-shutdown voltage of the battery cell module according to the discharge parameter of the battery cell module and the under-voltage protection voltage of the battery cell module.
The pre-shutdown voltage is larger than the under-voltage protection voltage, and the SOC value of the battery pack under the pre-shutdown voltage is a set minimum SOC value. When the battery cell voltage of the battery cell module reaches the pre-shutdown voltage, the SOC is adjusted to be a minimum SOC value, for example, 0%, and at the moment, the battery pack can close the Alternating Current (AC) output and the Direct Current (DC) output, but the discharging MOS of the battery pack is not disconnected, and the battery pack can also supply power for a main control chip of the electronic equipment, for example, a Micro Control Unit (MCU), and the electronic equipment is not powered down and shut down, so that data storage can be further executed.
In one embodiment, the discharge parameter includes a discharge current of the cell module; acquiring a preset adjustment coefficient and an under-voltage protection voltage of the battery cell module, wherein the preset adjustment coefficient is a positive value, and the preset adjustment coefficient is positively related to a target discharge parameter; calculating the product of a preset adjusting coefficient and the discharge current to obtain a second product; and adding the second product and the under-voltage protection voltage to obtain the pre-shutdown voltage of the battery cell module.
It should be noted that the preset adjustment coefficient is determined according to a target standby duration, where the target standby duration is used to characterize a duration from the SOC value to the minimum SOC value of the battery pack until the power-off switch can be used, and the preset adjustment coefficient is positively related to the target standby duration.
Step S303, obtaining the current cell voltage of the cell module, and calculating the voltage difference between the pre-shutdown voltage and the current cell voltage.
The pre-shutdown voltage of the battery cell module is V, the current battery cell voltage of the battery cell module is V1, and the voltage difference between the pre-shutdown voltage V and the current battery cell voltage V1 is calculated to be V-V1.
Step S304, determining a second correction coefficient according to the voltage difference, wherein the second correction coefficient is used for correcting the value of the residual electric quantity of the battery cell module.
It should be noted that, the second correction coefficient is positively related to the pre-shutdown voltage, that is, the larger the pre-shutdown voltage is, the larger the second correction coefficient is, the smaller the value of the corrected residual electric quantity is, which indicates that the risk of under-voltage power failure of the battery pack is smaller.
The second correction coefficient calculation formula is obtained, and the voltage difference between the pre-shutdown voltage and the current cell voltage is output to the second correction coefficient calculation formula for calculation to obtain a second correction coefficient. The second correction coefficient calculation formula includes k3=1+a '× (V-V1), K3 represents the second correction coefficient, a' represents a preset constant, for example, 0.5, and V-V1 represents a voltage difference between the pre-shutdown voltage V and the current cell voltage V1.
Illustratively, the second correction coefficient calculation formula further includes: k3 =1+a' × (V-V1) × (i-i ref )。Wherein K3 represents a second correction coefficient, a' represents a preset constant greater than zero and less than 1, and V-V1 represents a voltage difference between the pre-shutdown voltage V and the current cell voltage V1. Wherein i represents a discharge current, i ref Representing a reference current, wherein the discharge current i can be a current value output by the cell module, and the reference current i ref May be a reference value for the output current of the cell stack. By calculating the discharge current i and the reference current i ref The current difference between the two will be the current difference i-i ref And substituting the voltage difference value (V-V1) into the second correction coefficient calculation formula to calculate, so that the second correction coefficient K3 can be obtained quickly.
Step S305, calculating the value of the remaining power of the battery cell module according to the rated full power of the battery cell module, the discharge parameter and the second correction coefficient.
In one embodiment, the discharge parameter includes a discharge power of the battery cell module; calculating the product of the second correction coefficient and the discharge electric quantity to obtain a third product; and obtaining the rated full-load electric quantity of the battery cell module, and calculating the difference value of the rated full-load electric quantity and the third product to obtain the value of the residual electric quantity of the battery cell module.
It should be noted that the discharge parameters may also include a discharge current and a discharge time, and the discharge electric quantity of the battery cell module may be calculated according to the discharge current and the discharge time. The numerical value of the residual electric quantity can be accurately calculated through the rated full-load electric quantity, the discharge parameter and the second correction coefficient of the battery cell module, so that the numerical value of the residual electric quantity can be adjusted in real time, standby time is reserved for the electronic equipment so as to store data, and the electronic equipment is prevented from losing data due to the fact that the battery pack stops supplying power.
The value of the remaining power is calculated according to the rated full-load power, the discharge power and the second correction coefficient of the battery cell module by using the following formula:
C＝(fullcap-K3*∫Idt)；
wherein, C represents the value of the residual electric quantity, fullcap represents the rated full-load electric quantity of the battery cell module, idt represents the discharge electric quantity of the battery cell module, and K3 represents the second correction coefficient. It should be noted that, the discharging electric quantity of the battery cell module can be obtained by obtaining the integral value of the discharging current of the battery cell module, and substituting the rated full-load electric quantity, the discharging parameter and the second correction coefficient of the battery cell module into the above formula to calculate, so that the value of the residual electric quantity C can be obtained rapidly and accurately.
Step S306, calculating the pre-discharge time of the battery pack according to the value of the residual electric quantity and the discharge parameter.
It should be noted that after confirming the value of the actual dischargeable residual electric quantity, the pre-discharge duration of the battery pack can be accurately determined according to the value of the residual electric quantity and the discharge parameter, and after the discharge duration of the battery pack reaches the pre-discharge duration, the current cell voltage of the cell module will be equal to the pre-shutdown voltage, the battery pack will close the AC output and the DC output, and only the MCU of the electronic device is kept powered.
In one embodiment, a quotient between the value of the remaining power and the discharge power is calculated to obtain a pre-discharge duration of the battery pack. For example, if the remaining amount of dischargeable electricity 40WH is calculated, assuming that the present discharge voltage is 40V, the discharge current is 10A, and the discharge power is 400W, the pre-discharge period of the battery pack is 40/400=0.1h.
Step S307, based on the pre-discharge time length, a control instruction is output, wherein the control instruction is used for indicating the battery cell module to discharge according to the target discharge parameters after the pre-discharge time length.
The target discharge parameters are matched with discharge parameters required by the electronic equipment for executing data storage operation, so that the electronic equipment can execute the data storage operation by utilizing the power supply of the target discharge parameters provided by the battery pack.
In one embodiment, after determining the pre-discharge time period of the battery pack, the method further comprises: and outputting a data saving instruction when the pre-discharge time is less than or equal to the preset time, wherein the data saving instruction is used for indicating the battery pack of the electronic equipment to execute data saving operation.
It should be noted that, the discharging parameters of the battery pack may change, resulting in a sudden drop in the pre-discharging duration, so that the electronic device cannot save the data in time. Therefore, the time of the preset duration can be set to be shorter, and when the preset duration is smaller than or equal to the preset duration, a data storage instruction is output to instruct the battery pack of the electronic equipment to execute data storage operation, so that abrupt changes of the preset duration caused by changes of discharge parameters of the battery pack can be avoided, and the situation that the electronic equipment cannot store data in time is avoided.
In an embodiment, after the pre-discharge time of the battery cell module is calculated, a prompt message is output to the electronic device, so that the electronic device is prompted to execute the data storage operation after the pre-discharge time. The electronic equipment can receive the prompt information sent by the battery pack and store data after the pre-discharge time according to the prompt information.
It should be noted that, through the prompt message, not only the time that the battery pack of the electronic device discharges according to the target discharge parameter can be prompted, but also the electronic device can be prompted to execute the data saving operation after the pre-discharge time, so that the electronic device can save the data by utilizing the target discharge parameter, and the phenomenon of data loss can not occur.
According to the battery pack control method provided by the embodiment, the value of the residual electric quantity is calculated through calculating the pre-shutdown voltage and the second correction coefficient in real time, and the pre-discharge time length of the battery pack is determined by utilizing the corrected value of the residual electric quantity, so that the battery pack can supply power to the electronic equipment according to the target discharge parameter instead of directly powering down and shutting down the electronic equipment after the pre-discharge time length is the minimum SOC value, the power consumption requirement of the electronic equipment for executing data storage operation can be met, and the data loss of the electronic equipment due to the fact that the battery pack stops supplying power is avoided.
Referring to fig. 6, fig. 6 is a schematic block diagram of a battery pack according to an embodiment of the present application.
As shown in fig. 6, the battery pack 400 includes: a battery module 410 and a battery management system 420. Wherein, battery management system 420 is connected to cell module 410, and battery management system 420 is used to implement the battery pack control method of any of the embodiments of the present application.
Those skilled in the art will appreciate that the structure shown in fig. 6 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the battery pack 400 to which the present application is applied, and that a particular battery pack 400 may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
Wherein, in one embodiment, the battery management system 420 is configured to implement the following steps:
acquiring discharge parameters, rated full-load electric quantity and undervoltage protection voltage of the battery cell module;
determining a pre-shutdown voltage of the battery cell module according to the discharge parameter of the battery cell module and the under-voltage protection voltage of the battery cell module, wherein the pre-shutdown voltage is larger than the under-voltage protection voltage, and the SOC value of the battery pack under the pre-shutdown voltage is a set minimum SOC value;
acquiring the current cell voltage of the cell module, and calculating a voltage difference value between the pre-shutdown voltage and the current cell voltage;
determining the pre-discharge duration of the battery pack according to the rated full-load electric quantity of the battery cell module, the discharge parameter and the voltage difference value;
outputting a prompt control instruction based on the pre-discharge time length; the control instruction is used for indicating the cell module to discharge according to a target discharge parameter after the pre-discharge duration.
In one embodiment, when implementing the determination of the pre-discharge duration of the battery pack according to the rated full charge of the battery module, the discharge parameter and the voltage difference, the battery management system 420 is configured to implement:
Determining a first correction coefficient according to the voltage difference, wherein the first correction coefficient is positively correlated with the pre-shutdown voltage, and the first correction coefficient is used for correcting the value of the SOC of the battery cell module;
calculating the value of the SOC according to the rated full-load electric quantity of the battery cell module, the discharge parameter and the first correction coefficient;
and determining the pre-discharge duration of the battery pack according to the value of the SOC and the discharge parameter.
In one embodiment, the discharge parameter includes a discharge power of the cell module; when the battery management system 420 calculates the SOC value according to the rated full charge of the battery cell module, the discharge parameter and the first correction coefficient, the battery management system is configured to implement:
calculating the product of the first correction coefficient and the discharge electric quantity to obtain a first product;
acquiring rated full-load electric quantity of the battery cell module, and calculating a difference value of the rated full-load electric quantity and the first product to obtain a first difference value;
and calculating the quotient between the first difference value and the rated full-load electric quantity to obtain the value of the SOC.
In one embodiment, the discharge parameter comprises a discharge power of the cell module; when implementing the determination of the pre-discharge duration of the battery pack according to the SOC value and the discharge parameter, the battery management system 420 is configured to implement:
Calculating the pre-discharge electric quantity of the battery cell module according to the rated full-load electric quantity of the battery cell module and the numerical value of the SOC;
and calculating the quotient between the pre-discharge electric quantity and the discharge power to obtain the pre-discharge time length of the battery pack.
In one embodiment, when implementing the determination of the pre-discharge duration of the battery pack according to the rated full charge of the battery module, the discharge parameter and the voltage difference, the battery management system 420 is configured to implement:
determining a second correction coefficient according to the voltage difference value, wherein the second correction coefficient is used for correcting the value of the residual electric quantity of the battery cell module;
calculating the value of the residual electric quantity of the battery cell module according to the rated full-load electric quantity of the battery cell module, the discharge parameter and the second correction coefficient;
and calculating the pre-discharge time length of the battery pack according to the value of the residual electric quantity and the discharge parameter.
In one embodiment, the discharge parameter comprises a discharge current of the cell module; when the battery management system 420 determines the pre-shutdown voltage of the battery cell module according to the discharge parameter of the battery cell module and the under-voltage protection voltage of the battery cell module, the battery management system is configured to implement:
Acquiring a preset adjustment coefficient and an under-voltage protection voltage of the battery cell module, wherein the preset adjustment coefficient is a positive value, and the preset adjustment coefficient is positively related to the target discharge parameter;
calculating the product of the preset regulating coefficient and the discharge current to obtain a second product;
and adding the second product and the under-voltage protection voltage to obtain the pre-shutdown voltage of the battery cell module.
In one embodiment, the preset adjustment coefficient is determined according to a target standby duration, wherein the target standby duration is used for representing a duration of time from the SOC value to a minimum SOC value until the power-off switch can be used by the battery pack, and the preset adjustment coefficient is positively related to the target standby duration.
In one embodiment, the battery management system 420 is configured to, when implementing the obtaining the discharge parameter of the battery cell module:
acquiring the current SOC of the battery cell module;
and when the current SOC is smaller than or equal to a preset SOC threshold value, acquiring a discharge parameter of the battery cell module.
It should be noted that, for convenience and brevity of description, the specific working process of the battery pack 400 described above may refer to the corresponding process in the foregoing embodiment of the battery pack control method, and will not be 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: an output interface 510 and a battery pack 520.
Wherein the output interface 510 is for connecting an electronic device. A battery pack 520 is connected to the output interface 510, and the battery pack 520 is used to power the electronic device. The electronic device may be, for example, electric equipment such as a home air conditioner, an outdoor air conditioner, a washing machine, a water heater, and a mower.
In some embodiments, the battery pack 520 may be the battery pack 400 of the previous embodiments. In some embodiments, the energy storage device 500 may further be provided with circuit units such as a main control circuit, an inverter circuit, a rectifying 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 embodiment of the battery pack control method, which is not described herein again.
Finally, it should be noted that the above embodiments are merely for illustrating the technical solution of the present application and not for limiting, 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 the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.

Claims (10)

1. A battery pack control method, wherein the battery pack includes a battery cell module, the battery pack is used for connecting and supplying power to an electronic device, the method comprises:
acquiring discharge parameters, rated full-load electric quantity and undervoltage protection voltage of the battery cell module;
determining a pre-shutdown voltage of the battery cell module according to the discharge parameter of the battery cell module and the under-voltage protection voltage of the battery cell module, wherein the pre-shutdown voltage is larger than the under-voltage protection voltage, and the SOC value of the battery pack under the pre-shutdown voltage is a set minimum SOC value;
acquiring the current cell voltage of the cell module, and calculating a voltage difference value between the pre-shutdown voltage and the current cell voltage;
determining the pre-discharge duration of the battery pack according to the rated full-load electric quantity of the battery cell module, the discharge parameter and the voltage difference value;
outputting a control instruction based on the pre-discharge time length; the control instruction is used for indicating the cell module to discharge according to a target discharge parameter after the pre-discharge duration.
2. The battery pack control method according to claim 1, wherein the determining the pre-discharge duration of the battery pack according to the rated full charge amount of the battery cell module, the discharge parameter, and the voltage difference value includes:
Determining a first correction coefficient according to the voltage difference, wherein the first correction coefficient is positively correlated with the pre-shutdown voltage, and the first correction coefficient is used for correcting the value of the SOC of the battery cell module;
calculating the value of the SOC according to the rated full-load electric quantity of the battery cell module, the discharge parameter and the first correction coefficient;
and determining the pre-discharge duration of the battery pack according to the value of the SOC and the discharge parameter.
3. The battery pack control method according to claim 2, wherein the discharge parameter includes a discharge amount of the battery cell module; the calculating the value of the SOC according to the rated full charge of the battery cell module, the discharge parameter and the first correction coefficient includes:
calculating the product of the first correction coefficient and the discharge electric quantity to obtain a first product;
acquiring rated full-load electric quantity of the battery cell module, and calculating a difference value of the rated full-load electric quantity and the first product to obtain a first difference value;
and calculating the quotient between the first difference value and the rated full-load electric quantity to obtain the value of the SOC.
4. The battery pack control method according to claim 2, wherein the discharge parameter includes a discharge power of the cell module; the determining the pre-discharge duration of the battery pack according to the value of the SOC and the discharge parameter comprises the following steps:
Calculating the pre-discharge electric quantity of the battery cell module according to the rated full-load electric quantity of the battery cell module and the numerical value of the SOC;
and calculating the quotient between the pre-discharge electric quantity and the discharge power to obtain the pre-discharge time length of the battery pack.
5. The method according to claim 1, wherein the determining the pre-discharge time period of the battery pack according to the rated full charge amount, the discharge parameter and the voltage difference value of the battery cell module comprises:
determining a second correction coefficient according to the voltage difference value, wherein the second correction coefficient is used for correcting the value of the residual electric quantity of the battery cell module;
calculating the value of the residual electric quantity of the battery cell module according to the rated full-load electric quantity of the battery cell module, the discharge parameter and the second correction coefficient;
and calculating the pre-discharge time length of the battery pack according to the value of the residual electric quantity and the discharge parameter.
6. The battery pack control method according to any one of claims 1 to 5, wherein the discharge parameter includes a discharge current of the cell module; the determining the pre-shutdown voltage of the battery cell module according to the discharge parameter of the battery cell module and the under-voltage protection voltage of the battery cell module comprises the following steps:
Acquiring a preset adjustment coefficient and an under-voltage protection voltage of the battery cell module, wherein the preset adjustment coefficient is a positive value, and the preset adjustment coefficient is positively related to the target discharge parameter;
calculating the product of the preset regulating coefficient and the discharge current to obtain a second product;
and adding the second product and the under-voltage protection voltage to obtain the pre-shutdown voltage of the battery cell module.
7. The battery pack control method according to claim 6, wherein the preset adjustment coefficient is determined according to a target standby period, wherein the target standby period is used for representing a period from the SOC value being a minimum SOC value until the power-off switch can be used, and the preset adjustment coefficient is positively correlated with the target standby period.
8. The battery pack control method according to any one of claims 1 to 5, wherein the acquiring the discharge parameter of the cell module includes:
acquiring the current SOC of the battery cell module;
and when the current SOC is smaller than or equal to a preset SOC threshold value, acquiring a discharge parameter of the battery cell module.
9. A battery pack, the battery pack comprising:
A battery cell module;
a battery management system connected to the cell module, the battery management system for implementing the battery pack control method of any one of claims 1 to 8.
10. An energy storage device, the energy storage device comprising:
the output interface is used for connecting the electronic equipment;
the battery pack of claim 9, coupled to the output interface, for powering the electronic device.
CN202310341396.5A 2023-03-27 2023-03-27 Battery pack control method, battery pack and energy storage device Pending CN116365652A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119298316A (en) * 2024-12-13 2025-01-10 南昌济铃新能源科技有限责任公司 Energy storage system control method, device, storage medium and system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119298316A (en) * 2024-12-13 2025-01-10 南昌济铃新能源科技有限责任公司 Energy storage system control method, device, storage medium and system

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