CN116093455A - Battery management method, device and system - Google Patents

Battery management method, device and system Download PDF

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Publication number
CN116093455A
CN116093455A CN202310086208.9A CN202310086208A CN116093455A CN 116093455 A CN116093455 A CN 116093455A CN 202310086208 A CN202310086208 A CN 202310086208A CN 116093455 A CN116093455 A CN 116093455A
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China
Prior art keywords
battery modules
target
battery
module
battery module
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CN202310086208.9A
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Chinese (zh)
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CN116093455B (en
Inventor
巩欣
刘国锋
杨晓伟
任志刚
刘春华
王旭
李长松
张哲�
郑百祥
冯喆
张仕琳
马铁锁
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Tower Energy Co ltd
China Tower Co Ltd
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China Tower Co Ltd
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    • 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
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • 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
    • H02J7/0013—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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between 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
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—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

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

Abstract

The embodiment of the invention provides a battery management method, a device and a system, wherein the method is applied to a battery management system, the battery management system comprises N battery modules connected in parallel in a target circuit, and the method comprises the following steps: obtaining voltage values of N battery modules; comparing the voltage value of each battery module in the N battery modules with the highest voltage value in the N battery modules to obtain M first target battery modules and L second target battery modules, wherein the first target battery modules are battery modules with the difference value between the voltage value and the highest voltage value in the N battery modules being smaller than or equal to a preset threshold value, and the second target battery modules are battery modules with the difference value between the voltage value and the highest voltage value in the N battery modules being larger than the preset threshold value; and the loop corresponding to the first target battery module in the control target circuit is conducted, and the loop corresponding to the second target battery module in the control target circuit is disconnected. The risk of mutual charging and overcurrent among the parallel battery modules is reduced.

Description

Battery management method, device and system
Technical Field
The present invention relates to the field of batteries, and in particular, to a battery management method, device and system.
Background
The battery technology is developed rapidly, and under the application scene of expanding the capacity of the battery, the new battery and the old battery are mixed for use, for example, the retired battery is reused.
In the prior art, new and old batteries are usually connected in parallel to increase the capacity of the batteries. However, a voltage difference exists between the new battery and the old battery, so that the battery with higher voltage is easy to charge the battery with lower voltage, the charging current is uncontrollable, and the risk that the parallel batteries are mutually charged and overflowed exists.
Therefore, the problem of the parallel battery charging overcurrent exists in the prior art.
Disclosure of Invention
The embodiment of the invention provides a battery management method, device and system, which are used for solving the problem that parallel batteries are mutually charged and overcurrent in the prior art.
The embodiment of the invention provides a battery management method which is applied to a battery management system, wherein the battery management system comprises N battery modules connected in parallel in a target circuit, N is a positive integer, and the method comprises the following steps:
acquiring voltage values of the N battery modules;
comparing the voltage value of each battery module in the N battery modules with the highest voltage value in the N battery modules to obtain M first target battery modules and L second target battery modules, wherein the first target battery modules are battery modules, the difference value between the voltage value in the N battery modules and the highest voltage value is smaller than or equal to a preset threshold value, the second target battery modules are battery modules, the difference value between the voltage value in the N battery modules and the highest voltage value is larger than the preset threshold value, M and L are positive integers smaller than or equal to N, and the sum of M and L is equal to N;
And controlling the connection of a loop corresponding to the first target battery module in the target circuit, and controlling the disconnection of a loop corresponding to the second target battery module in the target circuit.
Optionally, under the condition that the voltage values corresponding to the M first target battery modules are changed, the step of comparing the voltage value of each battery module in the N battery modules with the highest voltage value in the N battery modules is performed back to obtain M 'first target battery modules and L' second target battery modules, where M 'and L' are positive integers less than or equal to N, and the sum of M 'and L' is equal to N.
Optionally, the battery management system further includes a load device, and after the controlling the loop corresponding to the first target battery module in the target circuit to be turned on and the controlling the loop corresponding to the second target battery module in the target circuit to be turned off, the method further includes:
calculating the discharge power of each first target battery module in the M first target battery modules to obtain total discharge power information;
transmitting the total discharge power information to the load equipment, wherein the load equipment is used for adjusting corresponding electric power according to the total discharge power information;
And controlling the M first target battery modules to output electric energy to the load equipment based on the received feedback information of the load equipment.
Optionally, the controlling the M first target battery modules to output electric energy to the load device based on the received feedback information of the load device includes:
when the feedback information is that the discharge power corresponding to the total discharge power information is smaller than the maximum power consumption of the load equipment, controlling the load equipment to adjust the corresponding power consumption according to the total discharge power information, and controlling the M first target battery modules to output the electric energy corresponding to the total discharge power information to the load equipment;
the feedback information is that when the discharge power corresponding to the total discharge power information is equal to the maximum power consumption of the load equipment, the M first target battery modules are controlled to output electric energy corresponding to the total discharge power information to the load equipment;
and when the discharging power corresponding to the total discharging power information is larger than the maximum power consumption of the load equipment, controlling Q first target battery modules in the M first target battery modules to output electric energy corresponding to the maximum power consumption to the load equipment, wherein Q is a positive integer smaller than M.
Optionally, the battery management system further comprises a charging device, and the method further comprises:
and under the condition that a charging signal of the charging device is received, controlling the loops corresponding to the N battery modules in the target circuit to be disconnected, and controlling the charging device to charge the N battery modules.
Optionally, the N battery modules are in cascade communication connection, a first battery module in the N battery modules is in communication connection with the load device, and the first battery module is a battery module located at the end part in the cascade communication connection;
the obtaining the voltage values of the N battery modules includes:
and under the condition that the first battery module receives the electricity utilization request from the load equipment, acquiring the voltage values of the N battery modules from the first battery module.
The embodiment of the invention also provides a battery management device, which comprises:
the acquisition module is used for acquiring the voltage values of the N battery modules;
the comparison module is used for comparing the voltage value of each battery module in the N battery modules with the highest voltage value in the N battery modules to obtain M first target battery modules and L second target battery modules, wherein the first target battery modules are battery modules, the difference value between the voltage value in the N battery modules and the highest voltage value is smaller than or equal to a preset threshold value, the second target battery modules are battery modules, the difference value between the voltage value in the N battery modules and the highest voltage value is larger than the preset threshold value, M and L are positive integers smaller than or equal to N, and the sum of M and L is equal to N;
And the first control module is used for controlling the conduction of a loop corresponding to the first target battery module in the target circuit and controlling the disconnection of a loop corresponding to the second target battery module in the target circuit.
Optionally, under the condition that the voltage values corresponding to the M first target battery modules are changed, the comparison module is further configured to obtain M 'first target battery modules and L' second target battery modules, where M 'and L' are positive integers less than or equal to N, and a sum of M 'and L' is equal to N.
Optionally, the battery management system further includes a load device, and in the controlling the target circuit, the apparatus further includes:
the calculating module is used for calculating the discharge power of each first target battery module in the M first target battery modules to obtain total discharge power information;
the sending module is used for sending the total discharge power information to the load equipment, and the load equipment is used for adjusting the corresponding electric power according to the total discharge power information;
and the second control module is used for controlling the M first target battery modules to output electric energy to the load equipment based on the received feedback information of the load equipment.
Optionally, the second control module includes:
the first control submodule is used for controlling the load equipment to adjust corresponding electric power according to the total discharge power information and controlling the M first target battery modules to output electric energy corresponding to the total discharge power information to the load equipment when the feedback information is that the discharge power corresponding to the total discharge power information is smaller than the maximum electric power of the load equipment;
the second control sub-module is used for controlling the M first target battery modules to output electric energy corresponding to the total discharge power information to the load equipment when the feedback information is that the discharge power corresponding to the total discharge power information is equal to the maximum electric power of the load equipment;
and the third control sub-module is used for controlling Q first target battery modules in the M first target battery modules to output electric energy corresponding to the maximum electric power to the load equipment when the feedback information is that the electric power corresponding to the total electric power information is larger than the maximum electric power of the load equipment, and Q is a positive integer smaller than M.
Optionally, the battery management system further comprises a charging device, and the device further comprises:
And the third control module is used for controlling the corresponding loops of the N battery modules in the target circuit to be disconnected under the condition that the charging signal of the charging device is received, and controlling the charging device to charge the N battery modules.
Optionally, the N battery modules are in cascade communication connection, a first battery module in the N battery modules is in communication connection with the load device, and the first battery module is a battery module located at the end part in the cascade communication connection;
the acquisition module comprises:
and the acquisition sub-module is used for acquiring the voltage values of the N battery modules from the first battery module under the condition that the first battery module receives the power utilization request from the load equipment.
The embodiment of the invention also provides a battery management system, which comprises:
the target circuit comprises N battery modules connected in parallel, wherein the N battery modules are in cascade communication connection, a first battery module in the N battery modules comprises voltage values of the N battery modules, and the first battery module is a battery module positioned at the end part in the cascade communication connection.
Optionally, the system further comprises:
The load equipment is in communication connection with the first battery module, and is used for adjusting corresponding electric power according to the total discharge power information of the N battery modules.
Optionally, the system further comprises:
and the charging device is used for charging the N battery modules, and when the charging device charges the N battery modules, the loops corresponding to the N battery modules are disconnected in the target circuit.
In the embodiment of the invention, the obtained voltage value of each battery module is compared with the highest voltage value to determine the first target battery module with relatively higher voltage value and the second target battery module with relatively lower voltage value, and in the target circuit, the corresponding loop of the first target battery module is controlled to be conducted, and the corresponding loop of the second target battery module is controlled to be disconnected, so that the condition that the first target battery module charges the second target battery module in N battery modules is reduced, and the risk of mutual charging and overcurrent among the parallel battery modules is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a battery management method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a cascade relationship of battery modules according to an embodiment of the present invention;
FIG. 3 is a second flowchart of a battery management method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery management device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the structures so used are interchangeable under appropriate circumstances such that embodiments of the invention are capable of operation in sequences other than those illustrated or otherwise described herein, and that the objects identified by "first," "second," etc. are generally of a type and do not limit the number of objects, for example, the first object can be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
Referring to fig. 1, fig. 1 is a flowchart of a battery management method according to an embodiment of the invention. As shown in fig. 1, the battery management method provided by the embodiment of the invention is applied to a battery management system, wherein the battery management system comprises N battery modules connected in parallel in a target circuit, and N is a positive integer.
Under the battery capacity expansion application scene, the situation that new and old batteries are used in a mixed mode is unavoidable, for example, a user mixes a high-capacity energy storage battery of the retired battery with a common battery to reutilize the retired battery. For example, when the user does not determine whether or not the voltage values of the plurality of batteries match, the plurality of batteries are mixed and used. Therefore, if the battery modules with different voltage values are directly used in parallel, the risk of the parallel battery modules being mutually charged and overcurrent exists. Therefore, after the N battery modules are connected in parallel in the target circuit, the target circuit can be controlled by the battery management system. The method comprises the following steps:
step 101, obtaining voltage values of the N battery modules;
the N battery modules may include battery modules having the same or different voltage values, that is, the N battery modules may include a new battery module and a battery module used for a period of time, it should be understood that the voltage value of the lithium battery is reduced during the use process, and thus, a voltage difference exists between the new battery and the old battery. By acquiring the voltage value of each of the N battery modules, the battery modules temporarily unsuitable for parallel connection to the target circuit are further determined by step 102.
102, comparing the voltage value of each of the N battery modules with the highest voltage value of the N battery modules to obtain M first target battery modules and L second target battery modules, wherein the first target battery modules are battery modules with the difference value between the voltage value of the N battery modules and the highest voltage value being smaller than or equal to a preset threshold, the second target battery modules are battery modules with the difference value between the voltage value of the N battery modules and the highest voltage value being larger than the preset threshold, M and L are positive integers smaller than or equal to N, and the sum of M and L is equal to N;
the voltage value V of each battery module in the N battery modules is obtained through the step 101 n Thus can be based on V n Can determine that the N battery modules areMaximum voltage value V max Further calculate the voltage value V of each battery module n And the highest voltage value V max Pressure difference V between △n ，V △n ＝V max -V n . Thus, each V is compared △n And a preset threshold V safe The magnitude relation between the first and second battery modules can obtain M first and L second target battery modules, wherein the first target battery module can be the voltage value V in N battery modules n And the highest voltage value V max Difference V between △n Less than or equal to a preset threshold V safe The second target battery module may be a voltage value V among N battery modules n And the highest voltage value V max Difference V between △n Greater than a preset threshold V safe Is provided. In other words, the M first target battery modules have higher voltage values, and the target circuit may be first connected. And L second target battery modules have relatively lower voltage value, if the second target battery modules are connected into the target circuit at this time, the first target battery modules can charge the second target battery modules, and the charging current is uncontrollable, so that the risk of overcharging and overcurrent of the parallel battery modules exists. Therefore, the corresponding loops of the M first target battery modules and the L second target battery modules in the target circuit are further controlled by step 103, respectively.
It should be noted that the first target battery module may be a new battery module, or may be a battery module that is used for a period of time.
And 103, controlling the circuit corresponding to the first target battery module in the target circuit to be conducted, and controlling the circuit corresponding to the second target battery module in the target circuit to be disconnected.
The user can install N battery modules in the battery jar, and N battery modules can be connected into the target circuit through the return circuits that correspond respectively to charge and discharge. In the step, based on the determination of the M first target battery modules and the L second target battery modules in the step 102, the conduction of the loop corresponding to the first target battery module in the target circuit is controlled, so that the first target battery module is connected in parallel to the target circuit; and controlling the disconnection of a loop corresponding to the second target battery module in the target circuit to temporarily prohibit the second target battery module from being connected in parallel to the target circuit, reducing the condition that the first target battery module with higher voltage charges the second target battery module with lower voltage, and reducing the risk of the mutual charging and overcurrent of the parallel battery modules.
In the embodiment of the invention, the obtained voltage value of each battery module is compared with the highest voltage value to determine the first target battery module with relatively higher voltage value and the second target battery module with relatively lower voltage value, and in the target circuit, the corresponding loop of the first target battery module is controlled to be conducted, and the corresponding loop of the second target battery module is controlled to be disconnected, so that the condition that the first target battery module charges the second target battery module in N battery modules is reduced, and the risk of mutual charging and overcurrent among the parallel battery modules is reduced.
For a user, the new battery and the old battery can be directly installed in the same battery compartment without adding additional hardware equipment, for example, a Current limiting module or a power conversion module (DC/DC) is added in the related technology so as to limit the magnitude of the circulating Current of the parallel battery pack during charging and discharging. The convenience and the safety of the battery module are improved by the battery management method.
The battery modules are discharged for a period of time, for example, after the M first target battery modules are electrically connected with the target circuit, the load is powered, the voltage values corresponding to the M first target battery modules are reduced, for example, after the M first target battery modules are electrically connected with the target circuit, voltage differences possibly exist between the M first target battery modules, and therefore the situation of mutual charge and discharge exists. Thus, the voltage values corresponding to the M first target battery modules may be changed.
It should be understood that the voltage difference between the M first target battery modules is smaller than the voltage difference between the first target battery module and the second target battery module at this time, so that the circulating current when the M first target battery modules are charged and discharged in parallel is within the safety range.
Optionally, under the condition that the voltage values corresponding to the M first target battery modules are changed, the step of comparing the voltage value of each battery module in the N battery modules with the highest voltage value in the N battery modules is performed back to obtain M 'first target battery modules and L' second target battery modules, where M 'and L' are positive integers less than or equal to N, and the sum of M 'and L' is equal to N.
In some optional embodiments, the voltage values of the N battery modules may be obtained in real time, and when the voltage values corresponding to the M first target battery modules are monitored to change after the loop corresponding to the first target battery module in the target circuit is controlled to be turned on and the loop corresponding to the second target battery module in the target circuit is controlled to be turned off in step 103, the step of comparing the voltage value of each battery module in the N battery modules with the highest voltage value in the N battery modules in step 102 may be performed, so as to obtain updated M 'first target battery modules and L' second target battery modules. Further, through step 103, the conduction of the loops corresponding to the M 'first target battery modules in the target circuit is controlled, and the disconnection of the loops corresponding to the L' second target battery modules in the target circuit is controlled. Therefore, at least part of the L second target battery modules can be determined to be the first target battery modules, M first target battery modules are obtained from the newly added value M first target battery modules, and the L second target battery modules are correspondingly updated to obtain the L second target battery modules. The N battery modules can be connected in parallel to the target circuit, the utilization rate of the battery modules is improved, and the risk of mutual charging and overcurrent among the parallel battery modules is reduced.
Specifically, taking a case where a user installs 4 battery modules (respectively designated as #1, #2, #3 and # 4) in a battery compartment, the voltage values of the 4 battery modules may be the same or different, i.e., the 4 battery modules may include new and old batteries. The voltage values obtained by the battery management system for #1, #2, #3 and #4 may be 2.5V, 3V, 2V and 4V, respectively, where V may be known max 4V, #1 and V max Pressure difference V between △1 1.5V, #2 and V max Pressure difference V between △2 1V, #3 and V max Pressure difference V between △3 Is 2V, #4 and V max Pressure difference V between △4 Is 0V. With a preset threshold V safe For example, 1V is used as an example, and the preset threshold may be adjusted according to actual situations. V (V) △n ≤V safe The first target battery module of (c) includes #2 and #4, v △n ＞V safe Comprises #1 and #3.
At this time, the corresponding loops of #2 and #4 in the target circuit may be controlled to be turned on, so that #2 and #4 are connected in parallel to the target circuit first; meanwhile, the corresponding loops of the #1 and the #3 in the target circuit are controlled to be disconnected, so that the #1 and the #3 are temporarily prohibited from being connected into the target circuit in parallel, the condition that the #2 and/or the #4 with higher voltage charges the #1 and/or the #3 with lower voltage is reduced, and the risk of the parallel battery modules being mutually charged and overflowed is reduced.
After a period of discharge of #2 and #4, voltage values of #2 and #4 were monitored to be 2.5V and 3V, respectively. At this time, the voltage values of #1, #2, #3 and #4 are again obtained by the battery management system to be 2.5V, 2V and 3V, respectively, and it can be known that V 'at this time' max Is 3V, #1 and V' max Pressure difference V 'between' △1 0.5V, #2 and V' max Pressure difference V 'between' △2 Is 0.5V, #3 and V' max Pressure difference V 'between' △3 1V, #4 and V' max Pressure difference V 'between' △4 Is 0V. Preset threshold V safe Is 1V. Obtain V' △n ≤V safe Comprises #1, #2, #3 and #4.
At this time, the state of conduction of the loops corresponding to #2 and #4 in the control target circuit can be maintained while the loops corresponding to #1 and #3 in the control target circuit are conducted to connect the previously temporarily disabled loops #1 and #3 in parallel to the target circuit, due to V' △n ≤V safe Therefore, the circulating current between the #1, #2, #3 and #4 is in a safety range, so that the #1, #2, #3 and #4 can be connected in parallel to the target circuit, the utilization rate of the battery modules is improved, and the risk of mutual charging and overcurrent between the parallel battery modules is reduced.
It should be understood that, in the case where the L second target battery module voltage values are changed (for example, in charging #1 and #3 such that the voltage value increases of #1 and #3 are monitored), the step of comparing the voltage value of each of the N battery modules with the highest voltage value of the N battery modules may be performed as well, which is not described herein.
Optionally, the N battery modules are in cascade communication connection, a first battery module in the N battery modules is in communication connection with the load device, and the first battery module is a battery module located at the end part in the cascade communication connection;
the obtaining the voltage values of the N battery modules includes:
and under the condition that the first battery module receives the electricity utilization request from the load equipment, acquiring the voltage values of the N battery modules from the first battery module.
In the present embodiment, as shown in fig. 2, the battery management system configures N battery modules in a parallel mode. In the initial state of the battery pack parallel mode, the loops respectively corresponding to the N battery modules are turned off in the target circuit. A first battery module (# 1) of the N battery modules is in communication connection with the load equipment, and meanwhile, a second path RS485 of the battery module #1 is in communication connection with a first path RS485 communication interface of the battery module # 2. According to the method, the first path RS485 and the second path RS485 of two adjacent battery modules are connected end to end until the battery module #N.
The load device may poll the addresses of the battery modules sequentially from #1, #2, # … #n, and perform the following procedure:
When the host (i.e. the load device) inquires the address #1, the RS485_1 of the battery module #1 receives the data and replies the data of the battery module #1 of the host, and meanwhile, the RS485_2 of the battery module #1 inquires the data of the battery module # 2; the RS485_1 of the battery module #2 receives the data and replies all the data of the battery module #1, and meanwhile the RS485_2 of the battery module #2 inquires the data of the battery module # 3; the RS485_1 of the battery module #3 receives the data and replies all the data of the battery module #2, and meanwhile the RS485_2 of the battery module #3 inquires the data of the battery module # 4; by analogy to battery module #n, the query command sent by battery module #n may not be replied. The effect of the host polling the data at address #1 is that the data from battery module #1 to battery module # (N-1) all include the data from the current battery module and the next battery module, and the last battery module #n includes only the local data.
When the host inquires the address #N, the RS485_1 of the battery module #1 receives the data and replies the data of the stored battery module #N, and meanwhile, the RS485_2 of the battery module #1 inquires the data of the battery module # 2; the RS485_1 of the battery module #2 receives the data and replies to all (the battery module #2 to the battery module #n) data of the battery module #1, and meanwhile the RS485_2 of the battery module #2 inquires the data of the battery module # 3; the RS485_1 of the battery module #3 receives the data and replies to all (the battery module #3 to the battery module #n) data of the battery module #2, and meanwhile the RS485_2 of the battery module #3 inquires the data of the battery module # 4; and so on to the battery module #N, the query command sent by the battery module #N is not replied. The effect of the host after polling the data of the address battery module # (N-1) is that the data of the battery module #1 to the battery module # (N-2) all comprise the data of the current battery module and the last two battery modules, and the battery module # (N-1) comprises the data of the current battery module and the battery module #, and the last battery module #, only comprises the local data. Thus, communication interaction between the load equipment and the plurality of groups of battery modules is improved. Through the cascade communication mode, the battery module can automatically allocate the address without tedious manual address allocation. In the data transmission process, the problem of bus signal level attenuation caused by more cascade layers and relatively far distance between the first layer and the last layer is solved.
Optionally, the battery management system further includes a load device, and after the controlling the loop corresponding to the first target battery module in the target circuit to be turned on and the controlling the loop corresponding to the second target battery module in the target circuit to be turned off, the method further includes:
calculating the discharge power of each first target battery module in the M first target battery modules to obtain total discharge power information;
transmitting the total discharge power information to the load equipment, wherein the load equipment is used for adjusting corresponding electric power according to the total discharge power information;
and controlling the M first target battery modules to output electric energy to the load equipment based on the received feedback information of the load equipment.
In this embodiment, the user installs N battery modules in the battery slot of the load device, and may supply power to the load device through M first target battery modules among the N battery modules. Obtaining total discharge power information P by calculating the discharge power of each first target battery module in the M first target battery modules T ，P T Can be expressed as:
Figure BDA0004068884840000111
wherein N is M first target battery modules among N battery modules. The first battery module #1 communicates with the load device and updates and reports the number (M) of the allowable discharge battery packs and the total discharge power (P) of the parallel battery modules in real time T ) And the load equipment adjusts the self power consumption according to the total power reported by the first battery module and adjusts the charge and discharge power. And the load equipment reads the state information of each battery of the parallel battery pack according to the polling inquiry of each battery module address. And the state and fault information of the battery module are sent to a user or operation and maintenance personnel, so that the use safety and the user experience of the battery are improved. Wherein, the state information includes a voltage value, a remaining capacity, fault information, etc. of the battery. The first battery module is a battery module positioned at the end part in cascade communication connection.
Optionally, the controlling the M first target battery modules to output electric energy to the load device based on the received feedback information of the load device includes:
and when the feedback information is that the discharge power corresponding to the total discharge power information is smaller than the maximum power consumption of the load equipment, controlling the load equipment to adjust the corresponding power consumption according to the total discharge power information, and controlling the M first target battery modules to output the electric energy corresponding to the total discharge power information to the load equipment.
In this example, the total discharge power P allowed by the current state of the N battery modules T Less than the maximum power consumption of the load device, the total allowable discharge power P of the current state can be set T To the load device to control the load device according to the total discharge power information (i.e. the total discharge power P allowed by the current state) T ) And adjusting the corresponding electric power, controlling the M first target battery modules to output electric energy corresponding to the total discharge power information to the load equipment so as to drive the load equipment, and balancing the running state between the battery modules and the load equipment.
And controlling the M first target battery modules to output electric energy corresponding to the total discharge power information to the load equipment under the condition that the discharge power corresponding to the total discharge power information is equal to the maximum electric power of the load equipment.
In this example, the total discharge power P allowed by the current state of the N battery modules T And the maximum power consumption of the load equipment is equal to that of the load equipment, and the M first target battery modules can be controlled to output electric energy corresponding to the total discharge power information to the load equipment so as to drive the load equipment and improve the operation efficiency of the load equipment.
And controlling Q first target battery modules in the M first target battery modules to output electric energy corresponding to the maximum electric power to the load equipment under the condition that the discharge power corresponding to the total discharge power information is larger than the maximum electric power of the load equipment, wherein Q is a positive integer smaller than M.
In this example, the total discharge power P allowed by the current state of the N battery modules T The current state of the load equipment is that the maximum electric power is larger than the maximum electric power of the load equipment, the loops corresponding to the M first target battery modules can be disconnected in the target circuit, so that the Q first target battery modules output the maximum electric power to the load equipment (namely, the current state of the Q first target battery modules is thatTotal discharge power P of first target battery module T ) The corresponding electric energy is used for driving the load equipment, so that the operation efficiency of the load equipment is improved, and meanwhile, the operation states between the battery module and the load equipment are balanced.
Optionally, the battery management system further comprises a charging device, and the method further comprises:
and under the condition that a charging signal of the charging device is received, controlling the loops corresponding to the N battery modules in the target circuit to be disconnected, and controlling the charging device to charge the N battery modules.
In this embodiment, under the charging condition, the circuit corresponding to each battery module may be disconnected from the target circuit by the battery management system, so as to separately charge each group of batteries. In this way, the risk of overcharging and overcurrent between the battery modules can be reduced in the charging process.
In an embodiment, as shown in fig. 3, N battery modules are first configured in a parallel mode, and in an initial state of the parallel mode of the battery pack, loops corresponding to the N battery modules are turned off in a target circuit, and cascade communication connection between the N battery modules is established. Then, the voltage value V of each of the N battery modules is obtained through the step 101 n Thus can be based on V n Can determine the highest voltage value V in N battery modules max Further calculate the voltage value V of each battery module n And the highest voltage value V max Pressure difference V between △n ，V △n ＝V max -V n . Thus, each V is compared △n And a preset threshold V safe The size relation between the first target battery modules and the second target battery modules can be obtained so as to perform balanced management among the N battery modules; and further, through step 103, controlling the conduction of a loop corresponding to the first target battery module in the target circuit, and controlling the disconnection of a loop corresponding to the second target battery module in the target circuit, so that M first target battery modules are connected in parallel in a balanced state, and the risk of mutual charging and overcurrent between the parallel battery modules is reduced.
In the discharging process, a first battery module in the N battery modules is in communication connection with the load equipment, the first battery module is a battery module at the end part in cascade communication connection, and therefore the load equipment can adjust self power consumption according to total power reported by the first battery module, and adjustment of charging and discharging power is carried out.
In the charging process, the N battery modules can be removed and connected in parallel, the battery modules are respectively charged through a plurality of charging devices, and one battery device can correspond to one battery module.
The embodiment of the present invention further provides a battery management device, as shown in fig. 4, a battery management device 400 includes:
an obtaining module 401, configured to obtain voltage values of N battery modules;
the comparison module 402 is configured to compare a voltage value of each of the N battery modules with a highest voltage value of the N battery modules to obtain M first target battery modules and L second target battery modules, where the first target battery modules are battery modules in which a difference value between the voltage value of the N battery modules and the highest voltage value is smaller than or equal to a preset threshold, the second target battery modules are battery modules in which a difference value between the voltage value of the N battery modules and the highest voltage value is greater than the preset threshold, M and L are positive integers less than or equal to N, and a sum of M and L is equal to N;
the first control module 403 is configured to control a loop corresponding to the first target battery module in the target circuit to be turned on, and control a loop corresponding to the second target battery module in the target circuit to be turned off.
Optionally, when the voltage values corresponding to the M first target battery modules change, the comparing module 402 is further configured to obtain M 'first target battery modules and L' second target battery modules, where M 'and L' are positive integers less than or equal to N, and the sum of M 'and L' is equal to N.
Optionally, the battery management system further includes a load device, and in the controlling the target circuit, the apparatus further includes:
the calculating module is used for calculating the discharge power of each first target battery module in the M first target battery modules to obtain total discharge power information;
the sending module is used for sending the total discharge power information to the load equipment, and the load equipment is used for adjusting the corresponding electric power according to the total discharge power information;
and the second control module is used for controlling the M first target battery modules to output electric energy to the load equipment based on the received feedback information of the load equipment.
Optionally, the second control module includes:
the first control submodule is used for controlling the load equipment to adjust corresponding electric power according to the total discharge power information and controlling the M first target battery modules to output electric energy corresponding to the total discharge power information to the load equipment when the feedback information is that the discharge power corresponding to the total discharge power information is smaller than the maximum electric power of the load equipment;
The second control sub-module is used for controlling the M first target battery modules to output electric energy corresponding to the total discharge power information to the load equipment when the feedback information is that the discharge power corresponding to the total discharge power information is equal to the maximum electric power of the load equipment;
and the third control sub-module is used for controlling Q first target battery modules in the M first target battery modules to output electric energy corresponding to the maximum electric power to the load equipment when the feedback information is that the electric power corresponding to the total electric power information is larger than the maximum electric power of the load equipment, and Q is a positive integer smaller than M.
Optionally, the battery management system further comprises a charging device, and the device further comprises:
and the third control module is used for controlling the corresponding loops of the N battery modules in the target circuit to be disconnected under the condition that the charging signal of the charging device is received, and controlling the charging device to charge the N battery modules.
Optionally, the N battery modules are in cascade communication connection, a first battery module in the N battery modules is in communication connection with the load device, and the first battery module is a battery module located at the end part in the cascade communication connection;
The acquisition module 401 includes:
and the acquisition sub-module is used for acquiring the voltage values of the N battery modules from the first battery module under the condition that the first battery module receives the power utilization request from the load equipment.
The battery management device 400 provided in the embodiment of the present invention can implement each process implemented by the method embodiment shown in fig. 1, and can achieve the same beneficial effects, so that repetition is avoided, and no further description is provided herein.
The embodiment of the invention also provides a battery management system, which comprises:
the target circuit comprises N battery modules connected in parallel, wherein the N battery modules are in cascade communication connection, a first battery module in the N battery modules comprises voltage values of the N battery modules, and the first battery module is a battery module positioned at the end part in the cascade communication connection.
Optionally, the system further comprises:
the load equipment is in communication connection with the first battery module, and is used for adjusting corresponding electric power according to the total discharge power information of the N battery modules.
Optionally, the system further comprises:
and the charging device is used for charging the N battery modules, and when the charging device charges the N battery modules, the loops corresponding to the N battery modules are disconnected in the target circuit.
The battery management system provided by the embodiment of the invention can realize each process realized by the method embodiment shown in fig. 1, and can obtain the same beneficial effects, and in order to avoid repetition, the description is omitted.
It should be noted that, in this document, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present invention is not limited to performing the functions in the order discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims (10)

1. A battery management method, applied to a battery management system, the battery management system including N battery modules connected in parallel in a target circuit, N being a positive integer, the method comprising:
acquiring voltage values of the N battery modules;
comparing the voltage value of each battery module in the N battery modules with the highest voltage value in the N battery modules to obtain M first target battery modules and L second target battery modules, wherein the first target battery modules are battery modules, the difference value between the voltage value in the N battery modules and the highest voltage value is smaller than or equal to a preset threshold value, the second target battery modules are battery modules, the difference value between the voltage value in the N battery modules and the highest voltage value is larger than the preset threshold value, M and L are positive integers smaller than or equal to N, and the sum of M and L is equal to N;
and controlling the connection of a loop corresponding to the first target battery module in the target circuit, and controlling the disconnection of a loop corresponding to the second target battery module in the target circuit.
2. The method according to claim 1, wherein the step of comparing the voltage value of each of the N battery modules with the highest voltage value of the N battery modules is performed in a case where the voltage values corresponding to the M first target battery modules are changed, so as to obtain M 'first target battery modules and L' second target battery modules, where M 'and L' are positive integers less than or equal to N, and the sum of M 'and L' is equal to N.
3. The method of claim 1, wherein the battery management system further comprises a load device, and wherein after the controlling the conduction of the loop corresponding to the first target battery module in the target circuit and the controlling the disconnection of the loop corresponding to the second target battery module in the target circuit, the method further comprises:
calculating the discharge power of each first target battery module in the M first target battery modules to obtain total discharge power information;
transmitting the total discharge power information to the load equipment, wherein the load equipment is used for adjusting corresponding electric power according to the total discharge power information;
and controlling the M first target battery modules to output electric energy to the load equipment based on the received feedback information of the load equipment.
4. The method of claim 3, wherein controlling the M first target battery modules to output electric power to the load device based on the received feedback information of the load device comprises:
when the feedback information is that the discharge power corresponding to the total discharge power information is smaller than the maximum power consumption of the load equipment, controlling the load equipment to adjust the corresponding power consumption according to the total discharge power information, and controlling the M first target battery modules to output the electric energy corresponding to the total discharge power information to the load equipment;
The feedback information is that when the discharge power corresponding to the total discharge power information is equal to the maximum power consumption of the load equipment, the M first target battery modules are controlled to output electric energy corresponding to the total discharge power information to the load equipment;
and when the discharging power corresponding to the total discharging power information is larger than the maximum power consumption of the load equipment, controlling Q first target battery modules in the M first target battery modules to output electric energy corresponding to the maximum power consumption to the load equipment, wherein Q is a positive integer smaller than M.
5. The method of claim 1, wherein the battery management system further comprises a charging device, the method further comprising:
and under the condition that a charging signal of the charging device is received, controlling the loops corresponding to the N battery modules in the target circuit to be disconnected, and controlling the charging device to charge the N battery modules.
6. The method according to any one of claims 1 to 5, wherein the N battery modules are connected in cascade communication, a first battery module of the N battery modules is connected in communication with a load device, and the first battery module is a battery module located at an end in the cascade communication;
The obtaining the voltage values of the N battery modules includes:
and under the condition that the first battery module receives the electricity utilization request from the load equipment, acquiring the voltage values of the N battery modules from the first battery module.
7. A battery management device, the device comprising:
the acquisition module is used for acquiring the voltage values of the N battery modules;
the comparison module is used for comparing the voltage value of each battery module in the N battery modules with the highest voltage value in the N battery modules to obtain M first target battery modules and L second target battery modules, wherein the first target battery modules are battery modules, the difference value between the voltage value in the N battery modules and the highest voltage value is smaller than or equal to a preset threshold value, the second target battery modules are battery modules, the difference value between the voltage value in the N battery modules and the highest voltage value is larger than the preset threshold value, M and L are positive integers smaller than or equal to N, and the sum of M and L is equal to N;
and the first control module is used for controlling the conduction of a loop corresponding to the first target battery module in the target circuit and controlling the disconnection of a loop corresponding to the second target battery module in the target circuit.
8. A battery management system, the system comprising:
the target circuit comprises N battery modules connected in parallel, wherein the N battery modules are in cascade communication connection, a first battery module in the N battery modules comprises voltage values of the N battery modules, and the first battery module is a battery module positioned at the end part in the cascade communication connection.
9. The system of claim 8, wherein the system further comprises:
the load equipment is in communication connection with the first battery module, and is used for adjusting corresponding electric power according to the total discharge power information of the N battery modules.
10. The system of claim 8, wherein the system further comprises:
and the charging device is used for charging the N battery modules, and when the charging device charges the N battery modules, the loops corresponding to the N battery modules are disconnected in the target circuit.
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CN107534188A (en) * 2015-11-13 2018-01-02 株式会社Lg化学 For the system and method for the output parameter for controlling secondary cell
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