CN114928139A - Lithium battery charging method, system and device and computer readable storage medium - Google Patents

Lithium battery charging method, system and device and computer readable storage medium Download PDF

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Publication number
CN114928139A
CN114928139A CN202210635483.7A CN202210635483A CN114928139A CN 114928139 A CN114928139 A CN 114928139A CN 202210635483 A CN202210635483 A CN 202210635483A CN 114928139 A CN114928139 A CN 114928139A
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current
charging
ups
lithium battery
charging power
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张堡森
杨平
陈曦
钟伟龙
郑伟龙
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Zhangzhou Kehua Electric Technology Co Ltd
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Zhangzhou Kehua Electric Technology Co Ltd
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Priority to CN202210635483.7A priority Critical patent/CN114928139A/en
Publication of CN114928139A publication Critical patent/CN114928139A/en
Priority to CN202310662489.8A priority patent/CN116885804A/en
Priority to CN202310662218.2A priority patent/CN116666790A/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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • 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
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • 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
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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

Abstract

The invention provides a lithium battery charging method, a system, a device and a computer readable storage medium, which relate to the field of lithium batteries, and are characterized in that after the charging power of a UPS (uninterrupted power supply), the current SOC of the UPS and the current SOCs of other lithium battery modules in a battery cabinet are determined, the current required charging power of the UPS is determined according to the charging power of the UPS, the current SOC of the lithium battery modules and the current SOCs of the other lithium battery modules, for example, the current required power of the UPS is increased when the SOC is low, the sum of the current required power of the UPS and the current required charging power of the other lithium battery modules is not larger than the charging power of the UPS, the situation that the lithium battery enters a discharging state due to the fact that the charging voltage of the UPS is pulled down to cause the lithium battery to enter a discharging state and to cause frequent switching between the charging and discharging states is avoided, and the charging stability of the lithium battery modules is improved.

Description

Lithium battery charging method, system and device and computer readable storage medium
Technical Field
The present invention relates to the field of lithium batteries, and in particular, to a method, system, device and computer readable storage medium for charging a lithium battery.
Background
In order to meet the power supply requirements of various loads, technicians often combine a plurality of lithium battery modules into a battery cabinet to supply power to the loads, so as to achieve higher output power. When a battery cabinet is charged by using a UPS (uninterruptible Power Supply), for any lithium battery module in the battery cabinet, the lithium battery module determines a charging Power required by itself according to a condition Of itself, such as SOC (State Of Charge) to control the charging Power output by the UPS to itself. When the charging power of the demand of each lithium battery module in the battery cabinet is greater than the maximum power that UPS can output, then can lead to the charging voltage of UPS output to be pulled down, when the charging voltage of UPS output is less than a definite value, can lead to lithium battery module can frequently switch between charging and discharging, can't normally charge to lithium battery module.
Disclosure of Invention
The invention aims to provide a lithium battery charging method, a lithium battery charging system, a lithium battery charging device and a computer readable storage medium, which can avoid frequent switching of a lithium battery between a charging state and a discharging state caused by the fact that the charging voltage of a UPS is lowered to enable the lithium battery to enter the discharging state, and improve the charging stability of a lithium battery module.
In order to solve the technical problem, the invention provides a lithium battery charging method, which is applied to any one lithium battery module in a battery cabinet, wherein the battery cabinet comprises N lithium battery modules, N is an integer not less than 2, and the lithium battery charging method comprises the following steps:
determining a charging power of the UPS;
determining the current SOC of the battery cabinet and the current SOCs of other lithium battery modules in the battery cabinet;
and determining the current required charging power of the UPS according to the charging power of the UPS, the current SOC of the UPS and the current SOCs of the other lithium battery modules, so that the sum of the current required charging power of the UPS and the current required charging power of the other lithium battery modules is not more than the charging power of the UPS.
Preferably, the determining the charging power of the UPS includes:
increasing a charging current of the UPS based on an initial current until a charging voltage of the UPS begins to drop;
determining a charging voltage of the UPS;
and determining the charging power of the UPS according to the charging current and the charging voltage of the UPS.
Preferably, after determining the current required charging power of the UPS according to the charging power of the UPS, the current SOC of the UPS, and the current SOC of the other lithium battery module, the method further includes:
and controlling the current self-charging current according to the charging voltage of the UPS and the current required charging power of the UPS.
Preferably, the controlling the current self-charging current according to the charging voltage of the UPS and the current self-required charging power includes:
when the charging voltage of the UPS is not lower than a preset voltage threshold, controlling the current self charging current not to be larger than the current self required charging power/the charging voltage of the UPS;
and when the charging voltage of the UPS is lower than the preset voltage threshold, reducing the current self charging current until the charging voltage of the UPS is not lower than the preset voltage threshold or the current self charging current is reduced to 0.
Preferably, determining the current required charging power of the UPS according to the charging power of the UPS, the current SOC of the UPS, and the current SOC of the other lithium battery module includes:
determine its own current required charging power as
Figure BDA0003681941490000021
Wherein P is the charging power, SOC of the UPS i The current SOC, SOC of the self 0 And i is more than or equal to 1 and less than or equal to N for the current SOC of the ith lithium battery module.
Preferably, the current required charging power is determined as
Figure BDA0003681941490000022
The method comprises the following steps:
if it is
Figure BDA0003681941490000023
If the current required charging power is larger than a preset power threshold, reducing the current required charging power until the current required charging power is not larger than the preset power threshold;
if it is
Figure BDA0003681941490000024
If the current required charging power is not greater than the preset power threshold, determining that the current required charging power per se is
Figure BDA0003681941490000025
Preferably, determining the current required charging power according to the charging power of the UPS, the current SOC of the UPS and the current SOCs of the other lithium battery modules includes:
determine its own current required charging power as
Figure BDA0003681941490000031
Wherein P is the charging power, SOC of the UPS 0 The current SOC, SOC of the self i And i is more than or equal to 1 and less than or equal to N, and K is more than 0 and less than or equal to 1 for the current SOC of the ith lithium battery module.
The invention also provides a lithium battery charging system, comprising:
the UPS charging power determining unit is used for determining the charging power of the UPS;
the SOC determining unit is used for determining the current SOC of the SOC determining unit and the current SOCs of other lithium battery modules in the battery cabinet;
and the required power determining unit is used for determining the current required charging power of the UPS according to the charging power of the UPS, the current SOC of the UPS and the current SOCs of the other lithium battery modules, so that the sum of the current required charging power of the UPS and the current required charging power of the other lithium battery modules is not greater than the charging power of the UPS.
The present invention also provides a lithium battery charging apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the above lithium battery charging method when executing the computer program.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the above-described lithium battery charging method.
After the charging power of a UPS, the current SOC of the UPS and the current SOCs of other lithium battery modules in a battery cabinet are determined, the current required charging power of the UPS is determined according to the charging power of the UPS, the current SOC of the lithium battery module and the current SOCs of the other lithium battery modules, for example, the current required power of the lithium battery is increased when the SOC of the lithium battery is low, the sum of the current required power of the lithium battery and the current required charging power of the other lithium battery modules is not larger than the charging power of the UPS, frequent switching of the lithium battery between a charging state and a discharging state caused by the fact that the charging voltage of the UPS is pulled down is avoided, and the charging stability of the lithium battery modules is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flow chart of a lithium battery charging method according to the present invention;
FIG. 2 is a schematic diagram of a battery cabinet including three lithium battery modules during charging;
fig. 3 is a schematic structural diagram of a lithium battery charging system provided in the present invention;
fig. 4 is a schematic structural diagram of a lithium battery charging apparatus provided in the present invention;
fig. 5 is a schematic structural view of a single lithium battery module.
Detailed Description
The core of the invention is to provide a lithium battery charging method, a system, a device and a computer readable storage medium, which can avoid the frequent switching between the charging and discharging states of the lithium battery caused by the fact that the charging voltage of the UPS is pulled down to cause the lithium battery to enter the discharging state, and improve the charging stability of the lithium battery module.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a lithium battery charging method according to the present invention.
A lithium battery charging method is applied to any one lithium battery module in a battery cabinet, the battery cabinet comprises N lithium battery modules, N is an integer not less than 2, and the lithium battery charging method comprises the following steps:
s1: determining a charging power of the UPS;
in view of the fact that, in the prior art, the required charging power of each lithium battery module is determined only according to the condition of the lithium battery, which may cause the total required charging power of each lithium battery module to be greater than the maximum charging power that can be provided by the UPS, so that the voltage of the UPS for charging the lithium battery is lowered to a certain threshold, and the lithium battery is frequently switched between the charging and discharging states. Specifically, the charging power of the UPS may be obtained by determining the charging current and the charging voltage of the UPS. When determining the charging power of the UPS, the charging power of the UPS may be determined in real time, or the charging power of the UPS may be determined periodically, which is not particularly limited in the present application. The determination of the charging power of the UPS facilitates the subsequent determination of the current required charging power of the lithium battery modules according to the charging power of the UPS, that is, the maximum charging power that the UPS can currently provide, so that the sum of the current required charging powers of the lithium battery modules is not greater than the charging power of the UPS.
S2: determining the current SOC of the battery cabinet and the current SOCs of other lithium battery modules in the battery cabinet;
in consideration of the fact that the SOC of each lithium battery module in the battery cabinet is different due to different old and new degrees, service lives and the like of the lithium battery modules in the battery cabinet, in order to optimize power distribution when the UPS continues to charge each lithium battery module, in this embodiment, the current SOC of the UPS and the current SOCs of other lithium battery modules in the battery cabinet are also determined, so that the charging power of the UPS is distributed in a balanced manner according to the SOC of each lithium battery module in the following. The other lithium battery modules are all other lithium battery modules in the battery cabinet except for performing the lithium battery charging method.
It should be further noted that, when determining the current SOC of other lithium battery modules in the battery cabinet, the current SOC of other lithium battery modules may be determined, but is not limited to, by means of CAN communication with other lithium battery modules.
S3: and determining the current required charging power of the UPS according to the charging power of the UPS, the current SOC of the UPS and the current SOCs of other lithium battery modules, so that the sum of the current required charging power of the UPS and the current required charging power of the other lithium battery modules is not more than the charging power of the UPS.
In this embodiment, the current required charging power of the UPS is determined according to the charging power of the UPS, the current SOC of the UPS, and the current SOCs of other lithium battery modules, for example, when the current SOC of the lithium battery module is lower than that of other lithium battery modules, a higher current required charging power is determined, and when the current SOC of the lithium battery module is higher than that of other lithium battery modules, a higher current required charging power is determined, so that the lithium battery modules with different current SOCs can be fully charged at the same time, and the charging power of the UPS is also maximally utilized. Meanwhile, the current required charging power of the UPS determined according to the charging power of the UPS, the current SOC of the UPS and the current SOCs of the other lithium battery modules is not more than the charging power of the UPS, so that the charging voltage of the UPS is kept stable and is not pulled down.
In summary, in this embodiment, after determining the charging power of the UPS, the current SOC of the UPS, and the current SOCs of other lithium battery modules in the battery cabinet, the current required charging power of the battery module is determined according to the charging power of the UPS, the current SOC of the battery module, and the current SOCs of other lithium battery modules, for example, when the SOC of the battery module is low, the current required charging power of the battery module is increased, so that the sum of the current required charging power of the battery module and the current required charging power of other lithium battery modules is not greater than the charging power of the UPS, thereby preventing the charging voltage of the UPS from being lowered to cause the lithium battery to enter a discharging state and cause the lithium battery to be frequently switched between the charging and discharging states, and improving the charging stability of the lithium battery module.
On the basis of the above-described embodiment:
referring to fig. 5, fig. 5 is a schematic structural diagram of a single lithium battery module.
As a preferred embodiment, determining the charging power of the UPS22 includes:
increasing the charging current of the UPS22 based on the initial current until the charging voltage of the UPS22 begins to drop;
determining a charging voltage of the UPS 22;
the charging power of the UPS22 is determined from the charging current and the charging voltage of the UPS 22.
In the present embodiment, the charging power of the UPS22 is determined according to the charging current and the charging voltage of the UPS 22. Specifically, increasing the current of the UPS22 from the initial current, for example, when the initial current is 1A, means controlling the charging current of the UPS22 to increase from 1A until the charging voltage of the UPS22 is pulled low is detected, and then stopping increasing the charging current, and determining the charging power of the UPS22 according to the charging current and the charging voltage of the UPS22 at that time. The initial current may be, but is not limited to, determined by determining any lithium battery module as a host in each lithium battery module, and each lithium battery module determines the magnitude of the initial current by communicating with the host. The charging current of the UPS22 can be determined by the RS485 communication with the UPS22, the RS485 has the advantages of good noise immunity, long transmission distance and the like, and the charging current of the UPS22 can be obtained more stably and accurately. In determining the charging voltage of the UPS22, the charging voltage of the UPS22 may be, but is not limited to, detected by providing a voltage detection module, where the charging voltage of the UPS22 specifically refers to the port voltage of the UPS 22. After the charging current and the charging voltage of the UPS22 are obtained, the charging power of the UPS22 can be determined according to the corresponding relationship among power, voltage, and current.
As a preferred embodiment, after determining the own current required charging power based on the charging power of the UPS22, the own current SOC, and the current SOC of the other lithium battery module 21, the method further includes:
the current self-charging current is controlled according to the charging voltage of the UPS22 and the current required charging power of the UPS.
As a preferred embodiment, the controlling the present self-charging current according to the charging voltage of the UPS22 and the present self-required charging power includes:
when the charging voltage of the UPS22 is not lower than the preset voltage threshold, controlling the current self charging current not to be larger than the current required charging power per the charging voltage of the UPS 22;
when the charging voltage of the UPS22 is lower than the preset voltage threshold, the current self-charging current is decreased until the charging voltage of the UPS22 is not lower than the preset voltage threshold or the current self-charging current is decreased to 0.
In consideration of the fact that in some abnormal situations, for example, communication between the lithium battery modules 21 is abnormal, when the current SOC of the other lithium battery modules 21 cannot be determined, the current required charging power of the UPS module cannot be determined according to the charging power of the UPS22, the current SOC of the UPS module and the current SOC of the other lithium battery modules 21, the sum of the current required charging power of the UPS module and the current required charging power of the other lithium battery modules 21 may be greater than the charging power of the UPS22, so that the charging of the UPS22 is pulled down, and the lithium batteries are frequently switched between the charging and discharging states. In order to solve the above problem, in the embodiment, when the charging voltage of the UPS22 is lower than the preset voltage threshold, it indicates that communication between the lithium battery modules 21 may be abnormal, which results in that the currently required power of each lithium battery module 21 is greater than the charging power of the UPS22, and the current charging current of the lithium battery module 21 needs to be reduced, that is, the current required charging power of the lithium battery module is reduced until the charging voltage of the UPS22 is not lower than the preset voltage threshold, or until the current charging current of the lithium battery module is reduced to 0, that is, the current charging power of the lithium battery module is reduced to 0. If the charging voltage of the UPS22 is not lower than the predetermined voltage threshold, it indicates that the communication between the lithium battery modules 21 is normal, and therefore, the current charging current is directly controlled not to be larger than the current required charging power per the charging voltage of the UPS 22. Under the condition that the communication of each lithium battery module 21 is abnormal, the charging voltage of the UPS22 can be ensured not to be lowered, and the charging stability is further improved.
In addition, the preset voltage threshold may be, but is not limited to, the set for the charging voltage of the UPS22 when the technician switches from the lithium battery to the battery according to frequent discharge. For example, if the charging voltage of the UPS22 is lower than 243V and the lithium battery module 21 is frequently switched between charging and discharging, the predetermined voltage may be set to 243V.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a battery cabinet including three lithium battery modules during charging.
As a preferred embodiment, the determination of the own currently required charging power based on the charging power of the UPS22, the own current SOC, and the current SOC of the other lithium battery module 21 includes:
determine its own current required charging power as
Figure BDA0003681941490000071
Wherein, P is the charging power, SOC of the UPS22 0 Current SOC of the device itself, SOC i I is more than or equal to 1 and less than or equal to N, which is the current SOC of the ith lithium battery module 21.
In order to fully utilize the charging capability of the UPS22 and enable the UPS22 to charge each li-battery module 21, the sum of the currently required charging powers of the li-battery modules 21 is not greater than the charging power of the UPS 22. In the present embodiment, the charging power of the UPS22 is allocated based on the current SOC of each lithium battery module 21, so that the charging power allocated to each lithium battery module 21 is set to
Figure BDA0003681941490000081
For example, when N is 3, if the current SOCs of the three lithium battery modules 21 are 0.4, 0.5, and 0.35, respectively, the charging power allocated to the lithium battery module 21 with the current SOC of 0.40, that is, the current required charging power is P (1-0.4)/(3-1.25) ═ P60/175, and the sum of the required charging powers of the modules is equal to the charging power of the UPS 22.
As a preferred embodiment, the current required charging power is determined to be
Figure BDA0003681941490000082
The method comprises the following steps:
if it is
Figure BDA0003681941490000083
If the current required charging power is larger than the preset power threshold, reducing the current required charging power until the current required charging power is not larger than the preset power threshold;
if it is
Figure BDA0003681941490000084
If the current required charging power is not greater than the preset power threshold, the current required charging power is determined to be
Figure BDA0003681941490000085
Considering that when the difference between the current SOCs of the lithium battery modules 21 is too large, the current required charging power determined by the lithium battery module 21 with the smaller current SOC may be too large, so that the charging current is larger than the maximum charging current allowed by the lithium battery module 21, for example, 40A, in this embodiment, if the difference between the current SOCs of the lithium battery modules 21 is too large, the charging current is larger than the maximum charging current allowed by the lithium battery module 21, for example, in this embodiment, if the difference is too large
Figure BDA0003681941490000086
Is not greater than the preset power threshold, which indicates that the difference between the current SOC of each lithium battery module 21 is not large, and the charging current is not greater than the maximum charging current allowed by the lithium battery module 21, so that it is determined that the current required charging power of the lithium battery module is
Figure BDA0003681941490000087
If it is
Figure BDA0003681941490000088
If the current required charging power is determined to be larger than the preset power threshold, the current SOC of each lithium battery module 21 is greatly different, and the current required charging power per se is determined to be
Figure BDA0003681941490000089
The present charging current is larger than the maximum charging current allowed by the lithium battery module 21, so that the battery is damaged, and therefore, the present required charging power is reduced, for example, by adjusting the present SOC sent by the battery module, such as superimposing an adjustment amount, until the present required charging power is not larger than the preset power threshold. The preset power threshold herein may be, but is not limited to, determined by a technician based on the maximum charging current of the lithium battery module 21 and the charging voltage of the UPS 22.
As a preferred embodiment, determining the own current required charging power from the charging power of the UPS22, the own current SOC, and the current SOC of the other lithium battery module 21 includes:
determine its own current required charging power as
Figure BDA0003681941490000091
Wherein P is the charging power, SOC of the UPS22 0 Current SOC of the device itself i I is more than or equal to 1 and less than or equal to N, and K is more than 0 and less than or equal to 1, of the current SOC of the ith lithium battery module 21.
Considering that the charging power may fluctuate when the UPS22 charges the li-battery modules 21 such that the charging power of the UPS22 is lower than the sum of the currently required charging powers of the li-battery modules 21 at the moment of the fluctuation, the charging voltage of the UPS22 is pulled low, resulting in frequent switching of the li-battery modules 21 between charge and discharge states. In order to solve the above problem, in the present embodiment, the current required charging power of the battery is determined to be
Figure BDA0003681941490000092
Reserving a portion of UPS22 charging function by setting a factor KThe rate, for example, set K to 0.9, indicates that 10% of the charging power of the UPS22 is used as a reserved portion, so that when the charging power fluctuates, it can be ensured that the charging power of the UPS22 is not less than the sum of the currently required charging powers of the lithium battery modules 21.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a lithium battery charging system according to the present invention.
The invention also provides a lithium battery charging system, comprising:
a UPS charging power determination unit 31 for determining a charging power of the UPS 22;
an SOC determination unit 32, configured to determine a current SOC of the battery and current SOCs of other lithium battery modules 21 in the battery cabinet;
and a required power determining unit 33 for determining the own current required charging power according to the charging power of the UPS22, the own current SOC, and the current SOC of the other lithium battery module 21, so that the sum of the own current required charging power and the current required charging power of the other lithium battery module 21 is not greater than the charging power of the UPS 22.
For a related description of the lithium battery charging system, please refer to the above embodiments, which are not repeated herein.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a lithium battery charging apparatus according to the present invention.
The present invention also provides a lithium battery charging apparatus, comprising:
a memory 41 for storing a computer program;
a processor 42 for implementing the steps of the above-described lithium battery charging method when executing the computer program.
For the related introduction of the lithium battery charging device, please refer to the above embodiments, which are not described herein again.
The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described lithium battery charging method.
For the related description of the computer readable storage medium, please refer to the above embodiments, which are not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is simple, and the relevant points can be referred to the description of the method part.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A lithium battery charging method is characterized in that the method is applied to any one lithium battery module in a battery cabinet, the battery cabinet comprises N lithium battery modules, N is an integer not less than 2, and the lithium battery charging method comprises the following steps:
determining a charging power of the UPS;
determining the current SOC of the battery cabinet and the current SOCs of other lithium battery modules in the battery cabinet;
and determining the current required charging power of the UPS according to the charging power of the UPS, the current SOC of the UPS and the current SOCs of the other lithium battery modules, so that the sum of the current required charging power of the UPS and the current required charging power of the other lithium battery modules is not more than the charging power of the UPS.
2. The method of charging a lithium battery as claimed in claim 1, wherein determining the charging power of the UPS comprises:
increasing a charging current of the UPS based on an initial current until a charging voltage of the UPS begins to drop;
determining a charging voltage of the UPS;
and determining the charging power of the UPS according to the charging current and the charging voltage of the UPS.
3. The lithium battery charging method as claimed in claim 2, further comprising, after determining the own currently required charging power based on the charging power of the UPS, the own current SOC, and the current SOCs of the other lithium battery modules:
and controlling the current self charging current according to the charging voltage of the UPS and the current self required charging power.
4. A lithium battery charging method as set forth in claim 3, wherein controlling the present self-charging current based on the charging voltage of the UPS and the present self-required charging power comprises:
when the charging voltage of the UPS is not lower than a preset voltage threshold, controlling the current self charging current not to be larger than the current self required charging power/the charging voltage of the UPS;
and when the charging voltage of the UPS is lower than the preset voltage threshold, reducing the current self charging current until the charging voltage of the UPS is not lower than the preset voltage threshold or the current self charging current is reduced to 0.
5. The lithium battery charging method as claimed in any one of claims 1 to 4, wherein determining the own current required charging power from the charging power of the UPS, the own current SOC, and the current SOC of the other lithium battery module comprises:
determine its own current required charging power as
Figure FDA0003681941480000021
Wherein P is the charging power, SOC of the UPS 0 The current SOC, SOC of the self i And i is more than or equal to 1 and less than or equal to N for the current SOC of the ith lithium battery module.
6. A method for charging a lithium battery as claimed in claim 5, characterized in that the current required charging power of the battery itself is determined as
Figure FDA0003681941480000022
The method comprises the following steps:
if it is
Figure FDA0003681941480000023
If the current required charging power is greater than the preset power threshold, reducing the current required charging power until the current required charging power is not greater than the preset power threshold;
if it is
Figure FDA0003681941480000024
If the current required charging power is not greater than the preset power threshold, determining that the current required charging power per se is
Figure FDA0003681941480000025
7. The lithium battery charging method as claimed in any one of claims 1 to 6, wherein determining the own current required charging power from the charging power of the UPS, the own current SOC, and the current SOC of the other lithium battery module comprises:
determining the current required charging power per se as
Figure FDA0003681941480000026
Wherein P is the charging power, SOC of the UPS 0 The current SOC, SOC of the self i And i is more than or equal to 1 and less than or equal to N, and K is more than 0 and less than or equal to 1 for the current SOC of the ith lithium battery module.
8. A lithium battery charging system, comprising:
the UPS charging power determining unit is used for determining the charging power of the UPS;
the SOC determining unit is used for determining the current SOC of the SOC determining unit and the current SOCs of other lithium battery modules in the battery cabinet;
and the required power determining unit is used for determining the current required charging power of the UPS according to the charging power of the UPS, the current SOC of the UPS and the current SOCs of the other lithium battery modules, so that the sum of the current required charging power of the UPS and the current required charging power of the other lithium battery modules is not greater than the charging power of the UPS.
9. A lithium battery charging apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the lithium battery charging method according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method for charging a lithium battery according to any one of claims 1 to 7.
CN202210635483.7A 2022-06-07 2022-06-07 Lithium battery charging method, system and device and computer readable storage medium Pending CN114928139A (en)

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CN202210635483.7A CN114928139A (en) 2022-06-07 2022-06-07 Lithium battery charging method, system and device and computer readable storage medium
CN202310662489.8A CN116885804A (en) 2022-06-07 2023-06-06 Charging method of lithium battery device and lithium battery device
CN202310662218.2A CN116666790A (en) 2022-06-07 2023-06-06 Charging method of lithium battery device and lithium battery device

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