CN114844176A - Battery charging and discharging power control method and device and electronic equipment - Google Patents

Battery charging and discharging power control method and device and electronic equipment Download PDF

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Publication number
CN114844176A
CN114844176A CN202210652727.2A CN202210652727A CN114844176A CN 114844176 A CN114844176 A CN 114844176A CN 202210652727 A CN202210652727 A CN 202210652727A CN 114844176 A CN114844176 A CN 114844176A
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China
Prior art keywords
battery
charging
discharging
threshold value
charge
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Chinese (zh)
Inventor
万昱罡
史迪新
王建伟
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Qingdao Nengfeng Electric Co ltd
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Qingdao Nengfeng Electric Co ltd
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Priority to CN202210652727.2A priority Critical patent/CN114844176A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • 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
    • 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
    • H02J7/00047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with provisions for charging different types of batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • 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
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
    • 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

Abstract

The invention belongs to the technical field of battery charging/discharging control, and provides a battery charging/discharging power control method, a device and electronic equipment, wherein the method comprises the following steps: configuring a single voltage threshold value of each battery and a total voltage threshold value of all batteries; acquiring the single voltage of each battery and the total voltage of all batteries in real time during charging/discharging; when the cell voltage of any battery reaches the cell voltage threshold value, or the overall voltage of all batteries in the charging/discharging circuit reaches the total voltage threshold value, the charging/discharging power is reduced. The method and the device configure the cell voltage threshold value of the battery and the overall voltage threshold value of the battery pack by acquiring the parameters of the battery, and comprehensively judge by combining the current cell voltage and the overall voltage of the battery, so as to control the charging/discharging power of the battery, avoid the situation that the battery enters into the limited charging/discharging state too early, improve the utilization rate of the battery, reduce the impact on the battery at different stages of charging/discharging, prolong the service life of the battery, and save the cost compared with the conventional BMS current limiting scheme.

Description

Battery charging and discharging power control method and device and electronic equipment
Technical Field
The invention belongs to the technical field of battery charging/discharging control, and particularly relates to a battery charging/discharging power control method and device, electronic equipment and a computer readable medium.
Background
The common battery types in the market at present are lithium iron phosphate batteries, ternary lithium batteries and the like, and are usually used in parallel or in series in a multi-group string form. The batteries have certain requirements on charge/discharge power, particularly the requirements on the charge/discharge power at the beginning and the end of charge/discharge are stricter, and the excessive charge/discharge power can cause the virtual floating of the battery power and influence the utilization efficiency of the batteries; even cause the battery to overcharge and overdischarge, seriously influence the service life of the battery and have certain potential safety hazard. A common solution is to control the battery by limiting the current through a Battery Management System (BMS), but this method generally places the BMS between the battery pack and the main controller, which increases the probability of failure and increases the cost.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the problems of improving the charging/discharging efficiency and the utilization rate of the battery and prolonging the service life of the battery.
(II) technical scheme
To solve the above technical problem, an aspect of the present invention provides a battery charging/discharging power control method for a battery charging/discharging circuit for charging/discharging at least two batteries, including:
configuring a single voltage threshold value of each battery and a total voltage threshold value of all batteries;
acquiring the single voltage of each battery and the total voltage of all batteries in real time during charging/discharging;
and when the cell voltage of any battery reaches the cell voltage threshold value or the total voltage of all batteries in the charge/discharge circuit reaches the total voltage threshold value, reducing the charge/discharge power.
According to the preferred embodiment of the present invention, parameter information of each battery is acquired;
setting different charging/discharging stages for the whole charging/discharging process of each battery;
and setting corresponding single voltage threshold values and total voltage threshold values for the charge/discharge stages according to the parameter information.
According to a preferred embodiment of the present invention, the setting of different charge/discharge phases for the entire charge/discharge process of the battery further comprises:
setting a stage in which both the cell voltage and the total voltage during the charging/discharging of the battery do not reach the corresponding threshold values as a first stage;
the stage in which the cell voltage or the total voltage at the time of charging/discharging the battery reaches the corresponding threshold value is set as the second stage.
According to a preferred embodiment of the present invention, the setting of the corresponding cell voltage threshold and the total voltage threshold for the charge/discharge phase according to the parameter information further includes:
setting the single voltage threshold value as a first threshold value and the total voltage threshold value as a second threshold value during the second-stage charging according to the parameter information;
and setting the single voltage threshold value during the second-stage discharging as a third threshold value and the total voltage threshold value as a fourth threshold value according to the parameter information.
According to a preferred embodiment of the present invention, the first threshold value is 3.55V, the second threshold value is 350V, the third threshold value is 2.7V, and the fourth threshold value is 280V.
According to a preferred embodiment of the invention, the method further comprises:
when the battery is in the first phase of charging/discharging, the charging/discharging power of the charging/discharging circuit is:
P＝IV general assembly ，
Wherein P is the charging/discharging power of the charging/discharging circuit, C is the total capacity of all the batteries, I is the total current of the charging/discharging circuit, and the current value is equal to 0.5 times of C and V General assembly Is the overall voltage of all cells.
According to a preferred embodiment of the present invention, the reducing the charging/discharging power when the cell voltage of any battery reaches the cell voltage threshold or the total voltage of all batteries in the charging/discharging circuit reaches the total voltage threshold further comprises:
and when the single voltage or the overall voltage is larger than the corresponding threshold value, controlling the charge/discharge to change into the second stage, and reducing the charge/discharge power to be 0.2 times of the current charge/discharge power.
According to a preferred embodiment of the invention, the charge/discharge circuit is adapted to charge/discharge at least two battery packs connected in parallel, the battery packs comprising at least two batteries connected in series.
A second aspect of the present invention provides a battery charge/discharge power control system for a battery charge/discharge circuit for charging/discharging at least two batteries, the system comprising: a battery pack, a control module, an inverter module and a control bus, wherein,
the battery packs are arranged in a charging/discharging circuit, and each battery pack is formed by connecting a preset number of batteries in series;
the inversion module is connected with the battery pack and used for adjusting the charging/discharging power of the battery pack;
the control module is respectively connected with the battery pack and the inversion module through a control bus and is used for acquiring parameter information of the battery pack and controlling the inversion module to adjust charging/discharging power.
According to a preferred embodiment of the invention, the control module comprises:
the voltage threshold configuration unit is used for configuring the single voltage threshold of each battery and the total voltage threshold of all the batteries;
a voltage information acquisition unit for acquiring the cell voltage of each battery and the total voltage of all the batteries in real time during charging/discharging;
and the voltage control unit is used for controlling the inversion module to reduce the charging/discharging power when the single voltage of any battery reaches the single voltage threshold value or the total voltage of all batteries in the charging/discharging circuit reaches the total voltage threshold value.
According to a preferred embodiment of the present invention, the voltage threshold configuration unit is further configured to:
acquiring parameter information of each battery;
setting different charging/discharging stages for the whole charging/discharging process of each battery;
and setting corresponding single voltage threshold values and total voltage threshold values for the charge/discharge stages according to the parameter information.
According to a preferred embodiment of the present invention, the voltage threshold configuration unit is further configured to:
setting a stage in which both the cell voltage and the total voltage during the charging/discharging of the battery do not reach the corresponding threshold values as a first stage;
the stage in which the cell voltage or the total voltage at the time of charging/discharging the battery reaches the corresponding threshold value is set as the second stage.
According to a preferred embodiment of the present invention, the voltage threshold configuration unit is further configured to:
setting the single voltage threshold value as a first threshold value and the total voltage threshold value as a second threshold value during the second-stage charging according to the parameter information;
and setting the single voltage threshold value during the second-stage discharging as a third threshold value and the total voltage threshold value as a fourth threshold value according to the parameter information.
According to a preferred embodiment of the present invention, the first threshold value is 3.55V, the second threshold value is 350V, the third threshold value is 2.7V, and the fourth threshold value is 280V.
According to a preferred embodiment of the invention, the inversion module is further configured to: setting the charge/discharge power of the charge/discharge circuit to:
P＝IV general assembly ，
Wherein P is the charging/discharging power of the charging/discharging circuit, C is the total capacity of all the batteries, I is the total current of the charging/discharging circuit, and the current value is equal to 0.5 times of C and V General assembly Is the overall voltage of all cells.
According to a preferred embodiment of the invention, the voltage control unit is further adapted to:
and when the single voltage or the overall voltage is larger than the corresponding threshold value, controlling the charge/discharge to change into the second stage, and reducing the charge/discharge power to be 0.2 times of the current charge/discharge power.
According to a preferred embodiment of the invention, the charge/discharge circuit is adapted to charge/discharge at least two battery packs connected in parallel, the battery packs comprising at least two batteries connected in series.
A third aspect of the invention proposes an electronic device comprising a processor and a memory for storing a computer-executable program, which, when executed by the processor, performs the method.
The fourth aspect of the present invention also provides a computer-readable medium storing a computer-executable program, which when executed, implements the method.
(III) advantageous effects
The method and the device configure the cell voltage threshold value of the battery and the overall voltage threshold value of the battery pack by acquiring the parameters of the battery, and comprehensively judge by combining the current cell voltage of the battery and the overall voltage of the battery pack, thereby controlling the charging/discharging power of the battery, avoiding the situation that the battery enters into the limited charging/discharging state too early, improving the utilization rate of the battery, simultaneously reducing the impact on the battery at different stages of charging/discharging, prolonging the service life of the battery, and saving the cost compared with the conventional BMS current limiting scheme.
Drawings
Fig. 1 is a flow chart of a battery charge/discharge power control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a battery charge/discharge power control system in accordance with an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an electronic device of one embodiment of the invention;
fig. 4 is a schematic diagram of a computer-readable recording medium of an embodiment of the present invention.
Detailed Description
In describing particular embodiments, specific details of structures, properties, effects, or other features are set forth in order to provide a thorough understanding of the embodiments by one skilled in the art. However, it is not excluded that a person skilled in the art may implement the invention in a specific case without the above-described structures, performances, effects or other features.
The flow chart in the drawings is only an exemplary flow demonstration, and does not represent that all the contents, operations and steps in the flow chart are necessarily included in the scheme of the invention, nor does it represent that the execution is necessarily performed in the order shown in the drawings. For example, some operations/steps in the flowcharts may be divided, some operations/steps may be combined or partially combined, and the like, and the execution order shown in the flowcharts may be changed according to actual situations without departing from the gist of the present invention.
The block diagrams in the figures generally represent functional entities and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and/or processing unit devices and/or microcontroller devices.
The same reference numerals denote the same or similar elements, components, or parts throughout the drawings, and thus, a repetitive description thereof may be omitted hereinafter. It will be further understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, or sections, these elements, components, or sections should not be limited by these terms. That is, these phrases are used only to distinguish one from another. For example, a first device may also be referred to as a second device without departing from the spirit of the present invention. Furthermore, the term "and/or", "and/or" is intended to include all combinations of any one or more of the listed items.
The invention provides a battery charging/discharging power control method, which is used for a battery charging/discharging circuit, a BMS host is not needed, a control module directly controls an inverter module, the voltage of each battery monomer and the total voltage of all batteries in the charging/discharging circuit are collected in real time, and when any monomer voltage or total voltage is higher than or lower than a preset threshold value, the charging/discharging power is automatically reduced, so that the purposes of improving the utilization rate of the batteries and prolonging the service life of the batteries are achieved.
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
In describing particular embodiments, specific details of structures, properties, effects, or other features are set forth in order to provide a thorough understanding of the embodiments by one skilled in the art. However, it is not excluded that a person skilled in the art may implement the invention in a specific case without the above-described structures, performances, effects or other features.
The flow chart in the drawings is only an exemplary flow demonstration, and does not represent that all the contents, operations and steps in the flow chart are necessarily included in the scheme of the invention, nor does it represent that the execution is necessarily performed in the order shown in the drawings. For example, some operations/steps in the flowcharts may be divided, some operations/steps may be combined or partially combined, and the like, and the execution order shown in the flowcharts may be changed according to actual situations without departing from the gist of the present invention.
The block diagrams in the figures generally represent functional entities and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different network and/or processing unit devices and/or microcontroller devices.
The same reference numerals denote the same or similar elements, components, or parts throughout the drawings, and thus, a repetitive description thereof may be omitted hereinafter. It will be further understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, or sections, these elements, components, or sections should not be limited by these terms. That is, these phrases are used only to distinguish one from another. For example, a first device may also be referred to as a second device without departing from the spirit of the present invention. Furthermore, the term "and/or", "and/or" is intended to include all combinations of any one or more of the listed items.
Fig. 1 is a flowchart of a battery charge/discharge power control method according to an embodiment of the present invention.
As shown in fig. 1, the method includes:
s101, configuring the single voltage threshold value of each battery and the total voltage threshold value of all batteries.
In the step, firstly, parameter information of each battery in the charging/discharging circuit is obtained, for example, information such as rated voltage, rated current and battery capacity when the battery leaves a factory is obtained, and for inconsistency of parameters of batteries of different types and batteries of different capacities, when the battery is installed in the charging/discharging circuit, the obtained parameter information of each battery is firstly input into a control system, for the batteries of different types, only corresponding parameters need to be modified in the control system, the control system automatically configures a simple circuit with the highest charging/discharging efficiency according to input limiting conditions and collected battery parameter information, and each battery in the circuit is ensured to meet the limiting conditions and parameter ranges.
After the parameter information is obtained, different charging/discharging stages are set for the whole charging/discharging process, for example, the preset time at the beginning of the charging/discharging process and the preset time at the end of the charging/discharging process are set as the second stage, and other times in the charging/discharging process are set as the first stage, so that the charging/discharging process is basically stable in the first charging/discharging stage, and the influence on the battery is small; in the second stage of charging/discharging, since the battery is low or tends to be saturated, if the charging/discharging power of the first stage is reused, the battery is affected, and therefore, in order to avoid this problem, a threshold value is set for the battery voltage during the charging/discharging process.
After the system is built and the charging/discharging circuit is completed, a single voltage threshold value is set for each battery in the circuit, a total voltage threshold value is set for the whole charging/discharging circuit, the setting of the threshold values is combined with the parameters and characteristics of the batteries, the range of the general threshold values is within the range of the inherent characteristics of the batteries, for example, the 100AH battery, only 80AH may be used when the battery is used, the voltage threshold values are set according to the data, and the battery is ensured to work at the stage with the highest efficiency.
In the embodiment of the present invention, different voltage thresholds are set for the charging stage and the discharging stage of the battery, for example, when the circuit only includes a battery pack formed by connecting 100 batteries in series, when the battery pack is charged, the maximum cell voltage threshold of each battery is set to be 3.55V, and the maximum cell voltage is the voltage V of all the batteries in the charging circuit 1 -V 100 Voltage V of medium maximum max The threshold is reached when the charging voltage of any one of the 100 series-connected batteries reaches 3.55V. When setting the maximum total voltage threshold, the maximum total voltage threshold is determined according to the circuit layout, and the total voltage threshold is V General assembly That is, if the circuit includes a plurality of parallel battery packs and each battery pack includes a plurality of batteries connected in series, the maximum total voltage threshold is adjusted according to the layout of the circuit, and when the circuit includes only a battery pack formed by connecting 100 batteries in series, the maximum total voltage threshold of all the batteries in the circuit is set to be V during charging General assembly If the circuit contains 2 parallel battery packs, each containing 50 series-connected cells, then V is equal to 3.5 cells, i.e. 350V General assembly 175V when the total voltage in the charging circuit is higher than V General assembly The threshold is reached at that time.
In the battery discharging stage, the minimum cell voltage threshold of each battery can be set to be 2.7V, and the minimum cell voltage is the voltage V of all batteries in the discharging circuit 1 -V 100 Medium minimum voltage V min The threshold is reached when the charging voltage of any one of the 100 series-connected batteries reaches 2.7V. When the circuit only comprises a battery pack consisting of 100 batteries connected in series, the minimum total voltage threshold value of all the batteries in the circuit during discharging is set to be V General assembly 2.8 cells, 280V, V if the circuit comprises 2 parallel battery packs, each battery pack comprising 50 cells in series General assembly 140V, when the total voltage in the charging circuit is lower than V General assembly The threshold is reached at that time.
And S102, acquiring the single voltage of each battery and the total voltage of all batteries in charge/discharge in real time.
In this step, it is first determined whether the current charging/discharging phase of the battery belongs to the first phase or the second phase according to the charging/discharging time of the battery, then the cell voltage of each battery and the total voltage of all batteries in the whole charging/discharging circuit are obtained, a sensor may be provided for each battery, and the sensor transmits the data of the voltage, current and the like of the battery to the control system through the CAN bus in real time.
And S103, when the cell voltage of any battery reaches the cell voltage threshold value or the total voltage of all batteries in the charging/discharging circuit reaches the total voltage threshold value, reducing the charging/discharging power.
In this step, when the charging/discharging process of the battery is in the first stage, the charging/discharging power of the charging/discharging circuit is:
P＝IV general assembly ，
Where P is the charging/discharging power of the charging/discharging circuit, C is the total capacity of all the cells, I is the total current of the charging/discharging circuit, and the current value is equal to 0.5 times C, for example, the total capacity of the battery pack is 100AH, then the corresponding current value is 0.5 × 100 — 50A, V General assembly Is the overall voltage of all cells.
When the charging/discharging process of the battery is in the second stage, or when the single voltage of any battery reaches the single voltage threshold value, or the total voltage of all batteries in the charging/discharging circuit reaches the total voltage threshold value, the first stage is changed into the second stage, the charging/discharging power is reduced to 0.2 times of the charging/discharging power in the first stage, namely P-IV General assembly I.e. a current value equal to 0.1 times C, ensures the efficiency and safety of the charging/discharging of the battery in the second stage.
The method of the embodiment of the invention configures the cell voltage threshold of the battery and the overall voltage threshold of the battery pack by acquiring the parameters of the battery, controls the charging/discharging power of the battery by combining the current cell voltage of the battery and the overall voltage of the battery pack, avoids the situation that the battery enters into the limited charging/discharging state too early, improves the utilization rate of the battery, reduces the impact on the battery at different stages of charging/discharging, prolongs the service life of the battery, and saves the cost compared with the conventional BMS current limiting scheme.
Embodiments of systems of the present invention are described below, which may be used to perform method embodiments of the present invention. Details described in the system embodiments of the invention should be considered supplementary to the above-described method embodiments; reference is made to the above-described method embodiments for details not disclosed in the system embodiments of the invention.
Fig. 2 is a schematic diagram of a battery charge/discharge power control system according to an embodiment of the present invention.
The system comprises: the battery pack comprises a battery pack, a control module, an inverter module and a control bus.
The battery packs are arranged in a charging/discharging circuit, and each battery pack is formed by connecting a preset number of batteries in series;
the inversion module is connected with the battery pack and used for adjusting the charging/discharging power of the battery pack;
the control module is respectively connected with the battery pack and the inversion module through a control bus and is used for acquiring parameter information of the battery pack and controlling the inversion module to adjust charging/discharging power.
Specifically, the control module includes two functions of data acquisition and service control, including:
the voltage threshold configuration unit is used for configuring the single voltage threshold of each battery and the total voltage threshold of all the batteries;
a voltage information acquisition unit for acquiring the cell voltage of each battery and the total voltage of all the batteries in real time during charging/discharging;
and the voltage control unit is used for controlling the inversion module to reduce the charging/discharging power when the single voltage of any battery reaches the single voltage threshold value or the total voltage of all batteries in the charging/discharging circuit reaches all total voltage threshold values.
The voltage threshold configuration unit is further configured to obtain parameter information of each battery, for example, information such as rated voltage, rated current, and battery capacity when the battery leaves a factory, and for inconsistency of parameters of batteries of different types and batteries of different capacities, when the battery is installed in a charging/discharging circuit, firstly, the obtained parameter information of each battery is input into a control system, and for the batteries of different types, only corresponding parameters need to be modified in a control module, and the control module automatically configures a simple circuit with the highest charging/discharging efficiency according to input limiting conditions and collected battery parameter information, so as to ensure that each battery in the circuit meets the limiting conditions and parameter ranges;
the voltage threshold configuration unit is further configured to set different charging/discharging phases for the entire charging/discharging process of each battery, for example, setting a preset time at the beginning of the charging/discharging process and a preset time at the end of the charging/discharging process as a second phase, and setting other times in the charging/discharging process as a first phase, where the charging/discharging process is substantially stable in the first charging/discharging phase, and the influence on the battery is small; in the second stage of charging/discharging, since the battery is low or tends to be saturated, if the charging/discharging power of the first stage is reused, the battery is affected, and therefore, in order to avoid this problem, a threshold value is set for the battery voltage during the charging/discharging process. After the system is built and the charging/discharging circuit is completed, a single voltage threshold value is set for each battery in the circuit, a total voltage threshold value is set for the whole charging/discharging circuit, the setting of the threshold values is combined with the parameters and characteristics of the batteries, the range of the general threshold values is within the range of the inherent characteristics of the batteries, for example, the 100AH battery, only 80AH may be used when the battery is used, the voltage threshold values are set according to the data, and the battery is ensured to work at the stage with the highest efficiency. In an embodiment of the invention, different voltage thresholds are set for the charging phase and the discharging phase of the battery.
The voltage information acquisition unit determines whether the current charging/discharging stage of the battery belongs to a first stage or a second stage according to the charging/discharging time of the battery, then acquires the single voltage of each battery and the total voltage of all batteries in the whole charging/discharging circuit, a sensor CAN be arranged on each battery, and the sensor transmits data such as voltage and current of the battery to the voltage information acquisition unit through a CAN bus in real time.
When the charging/discharging process of the battery is in the first stage, the voltage control unit controls the charging/discharging power of the charging/discharging circuit to be:
P＝IV general assembly ，
Where P is the charging/discharging power of the charging/discharging circuit, C is the total capacity of all the cells, I is the total current of the charging/discharging circuit, and the current value is equal to 0.5 times C, for example, the total capacity of the battery pack is 100AH, then the corresponding current value is 0.5 × 100 — 50A, V General assembly Is the overall voltage of all cells.
In the charging process, when the highest cell voltage of the battery is higher than a threshold value, or the overall voltage of the battery exceeds the threshold value, the voltage control unit changes the first stage into the second stage, and the input power of the inverter module is reduced. In the discharging process, when the lowest cell voltage of the battery is lower than a threshold value or the total voltage of the battery is lower than the threshold value, the voltage control unit changes the control from the first stage to the second stage, the output power of the inverter module is reduced, the charging/discharging power at the moment is reduced to 0.2 time of the charging/discharging power of the first stage, namely P is IV General assembly I.e. a current value equal to 0.1 times C, ensures the efficiency and safety of the charging/discharging of the battery in the second stage.
Those skilled in the art will appreciate that the modules in the above-described system embodiments may be distributed in the system as described, and that corresponding variations may be made in one or more systems other than the above-described embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention, which includes a processor and a memory, the memory storing a computer-executable program, and the processor executing a battery charge/discharge power control method when the computer program is executed by the processor.
As shown in fig. 3, the electronic device is in the form of a general purpose computing device. The processor can be one or more and can work together. The invention also does not exclude that distributed processing is performed, i.e. the processors may be distributed over different physical devices. The electronic device of the present invention is not limited to a single entity, and may be a sum of a plurality of entity devices.
The memory stores a computer executable program, typically machine readable code. The computer readable program may be executed by the processor to enable an electronic device to perform the method of the invention, or at least some of the steps of the method.
The memory may include volatile memory, such as Random Access Memory (RAM) and/or cache memory, and may also be non-volatile memory, such as read-only memory (ROM).
Optionally, in this embodiment, the electronic device further includes an I/O interface, which is used for data exchange between the electronic device and an external device. The I/O interface may be a local bus representing one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, and/or a memory storage device using any of a variety of bus architectures.
It should be understood that the electronic device shown in fig. 3 is only one example of the present invention, and elements or components not shown in the above example may be further included in the electronic device of the present invention. For example, some electronic devices further include a display unit such as a display screen, and some electronic devices further include a human-computer interaction element such as a button, a keyboard, and the like. Electronic devices are considered to be covered by the present invention as long as the electronic devices are capable of executing a computer-readable program in a memory to implement the method of the present invention or at least a part of the steps of the method.
Fig. 4 is a schematic diagram of a computer-readable recording medium of an embodiment of the present invention. As shown in fig. 4, the computer-readable recording medium has stored therein a computer-executable program that, when executed, implements the above-described battery charge/discharge power control method of the present invention. The computer readable storage medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable storage medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
The computer readable medium carries one or more programs which, when executed by a device, cause the computer readable medium to perform the functions of: configuring a single voltage threshold value of each battery and a total voltage threshold value of all batteries; acquiring the single voltage of each battery and the total voltage of all batteries in real time during charging/discharging; and when the cell voltage of any battery reaches the cell voltage threshold value or the overall voltage of the batteries in the charging/discharging circuit reaches the overall voltage threshold value, reducing the charging/discharging power.
Program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
From the above description of the embodiments, those skilled in the art will readily appreciate that the present invention can be implemented by hardware capable of executing a specific computer program, such as the system of the present invention, and electronic processing units, servers, clients, mobile phones, control units, processors, etc. included in the system. The invention may also be implemented by computer software for performing the method of the invention. It should be noted, however, that the computer software for executing the method of the present invention is not limited to be executed by one or a specific hardware entity, but may also be implemented in a distributed manner by hardware entities without specific details, for example, some method steps executed by a computer program may be executed by a mobile client, and another part may be executed by a smart meter, a smart pen, or the like. For computer software, the software product may be stored in a computer readable storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or may be distributed over a network, as long as it enables the electronic device to perform the method according to the present invention.
In summary, the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functionality of some or all of the components in embodiments in accordance with the invention may be implemented in practice using a general purpose data processing device such as a microprocessor or a Digital Signal Processor (DSP). The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
While the foregoing embodiments have described the objects, aspects and advantages of the present invention in further detail, it should be understood that the present invention is not inherently related to any particular computer, virtual machine or electronic device, and various general-purpose machines may be used to implement the present invention. The invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.

Claims (17)

1. A battery charge/discharge power control method for a battery charge/discharge circuit for charging/discharging at least two batteries, comprising:
configuring a single voltage threshold value of each battery and a total voltage threshold value of all batteries;
acquiring the single voltage of each battery and the total voltage of all batteries in real time during charging/discharging;
and when the cell voltage of any battery reaches the cell voltage threshold value or the total voltage of all batteries in the charge/discharge circuit reaches the total voltage threshold value, reducing the charge/discharge power.
2. The battery charge/discharge power control method of claim 1, wherein configuring the cell voltage threshold of each battery and the total voltage threshold of all batteries further comprises:
acquiring parameter information of each battery;
setting different charging/discharging stages for the whole charging/discharging process of each battery;
and setting corresponding single voltage threshold values and total voltage threshold values for the charge/discharge stages according to the parameter information.
3. The battery charge/discharge power control method according to claim 2, wherein the setting of different charge/discharge stages for the entire charge/discharge process of the battery further comprises:
setting a stage in which both the cell voltage and the total voltage during the charging/discharging of the battery do not reach the corresponding threshold values as a first stage;
the stage in which the cell voltage or the total voltage at the time of charging/discharging the battery reaches the corresponding threshold value is set as the second stage.
4. The battery charge/discharge power control method according to claim 3, wherein the setting of the respective cell voltage threshold and total voltage threshold for the charge/discharge phase according to the parameter information further comprises:
setting the maximum single voltage threshold value as a first threshold value and the maximum total voltage threshold value as a second threshold value during the second-stage charging according to the parameter information;
and setting the minimum cell voltage threshold value during the second-stage discharging as a third threshold value and the minimum total voltage threshold value as a fourth threshold value according to the parameter information.
5. The battery charge/discharge power control method according to claim 4,
the first threshold is 3.55V, the second threshold is 350V, the third threshold is 2.7V, and the fourth threshold is 280V.
6. The battery charge/discharge power control method according to claim 3, characterized in that the method further comprises:
when the battery is in the first phase of charging/discharging, the charging/discharging power of the charging/discharging circuit is:
P＝IV general assembly ，
Wherein P is the charging/discharging power of the charging/discharging circuit, C is the total capacity of all the batteries, I is the total current of the charging/discharging circuit, and the current value is equal to 0.5 times of C and V General assembly Is the overall voltage of all cells.
7. The battery charge/discharge power control method according to claim 3, wherein the reducing the charge/discharge power when the cell voltage of any one of the batteries reaches the cell voltage threshold value or the total voltage of all the batteries in the charge/discharge circuit reaches the total voltage threshold value, further comprises:
and when the single voltage or the overall voltage is larger than the corresponding threshold value, controlling the charge/discharge to change into the second stage, and reducing the charge/discharge power to be 0.2 times of the current charge/discharge power.
8. The battery charge/discharge power control method of claim 1, wherein the charge/discharge circuit is configured to charge/discharge at least two battery packs connected in parallel, the battery packs including at least two batteries connected in series.
9. A battery charge/discharge power control system for a battery charge/discharge circuit for charging/discharging at least two batteries, the system comprising: a battery pack, a control module, an inverter module and a control bus, wherein,
the battery packs are arranged in a charging/discharging circuit, and each battery pack is formed by connecting a preset number of batteries in series;
the inversion module is connected with the battery pack and used for adjusting the charging/discharging power of the battery pack;
the control module is respectively connected with the battery pack and the inversion module through a control bus and is used for acquiring parameter information of the battery pack and controlling the inversion module to adjust charging/discharging power.
10. The battery charge/discharge power control system of claim 9, wherein the control module comprises:
the voltage threshold configuration unit is used for configuring the single voltage threshold of each battery and the total voltage threshold of all the batteries;
a voltage information acquisition unit for acquiring the cell voltage of each battery and the total voltage of all the batteries in real time during charging/discharging;
and the voltage control unit is used for controlling the inversion module to reduce the charging/discharging power when the single voltage of any battery reaches the single voltage threshold value or the total voltage of all batteries in the charging/discharging circuit reaches the total voltage threshold value.
11. The battery charge/discharge power control system of claim 10 wherein the voltage threshold configuration unit is further configured to:
acquiring parameter information of each battery;
setting different charging/discharging stages for the whole charging/discharging process of each battery;
and setting corresponding single voltage threshold values and total voltage threshold values for the charge/discharge stages according to the parameter information.
12. The battery charge/discharge power control system of claim 11 wherein the voltage threshold configuration unit is further configured to:
setting a stage in which both the cell voltage and the total voltage during the charging/discharging of the battery do not reach the corresponding threshold values as a first stage;
the stage in which the cell voltage or the total voltage at the time of charging/discharging the battery reaches the corresponding threshold value is set as the second stage.
13. The battery charge/discharge power control system of claim 12 wherein the voltage threshold configuration unit is further configured to:
setting the single voltage threshold value as a first threshold value and the total voltage threshold value as a second threshold value during the second-stage charging according to the parameter information;
and setting the single voltage threshold value during the second-stage discharging as a third threshold value and the total voltage threshold value as a fourth threshold value according to the parameter information.
14. The battery charge/discharge power control system according to claim 13,
the first threshold is 3.55V, the second threshold is 350V, the third threshold is 2.7V, and the fourth threshold is 280V.
15. The battery charge/discharge power control system according to claim 12,
the inversion module is further configured to: setting the charge/discharge power of the charge/discharge circuit to:
P＝IV general assembly ，
Wherein P is the charge/discharge power of the charge/discharge circuit,c is total capacity of all batteries, I is total current of the charging/discharging circuit, and current value is equal to 0.5 times of C, V General assembly Is the overall voltage of all cells.
16. The battery charge/discharge power control system of claim 12, wherein the voltage control unit is further configured to:
and when the single voltage or the total voltage is larger than the corresponding threshold value, controlling the charging/discharging to be changed into the second stage, and controlling the inversion module to reduce the charging/discharging power to be 0.2 times of the current charging/discharging power.
17. The battery charge/discharge power control system of claim 9 wherein the charge/discharge circuit is configured to charge/discharge at least two battery packs in parallel, the battery packs comprising at least two batteries in series.
CN202210652727.2A 2022-06-07 2022-06-07 Battery charging and discharging power control method and device and electronic equipment Pending CN114844176A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024045956A1 (en) * 2022-08-31 2024-03-07 广东美的制冷设备有限公司 Energy storage system and power-source control method and apparatus therefor, and storage medium

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024045956A1 (en) * 2022-08-31 2024-03-07 广东美的制冷设备有限公司 Energy storage system and power-source control method and apparatus therefor, and storage medium

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