CN117134008A - Battery pack capacity balancing method, device and system - Google Patents
Battery pack capacity balancing method, device and system Download PDFInfo
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- CN117134008A CN117134008A CN202311397315.XA CN202311397315A CN117134008A CN 117134008 A CN117134008 A CN 117134008A CN 202311397315 A CN202311397315 A CN 202311397315A CN 117134008 A CN117134008 A CN 117134008A
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- 239000000178 monomer Substances 0.000 claims abstract description 100
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- 238000004146 energy storage Methods 0.000 claims description 21
- 238000012544 monitoring process Methods 0.000 claims description 20
- 238000012163 sequencing technique Methods 0.000 claims description 17
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- 238000004590 computer program Methods 0.000 description 18
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Classifications
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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
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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
- H02J7/0013—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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application relates to a battery pack capacity balancing method, a device and a system. The target balance battery pair comprises a first battery monomer and a second battery monomer, wherein the electric energy parameter difference value of the first battery monomer and the second battery monomer is larger than a preset electric energy parameter threshold value, and the electric quantity of the first battery monomer is larger than the electric quantity of the second battery monomer. And transferring the electric quantity of the first battery cell in the target balance battery pair to the second battery cell until the electric energy parameters of the first battery cell and the second battery cell meet the balance cut-off condition. The method improves the capacity balancing efficiency of the battery pack, and meanwhile, the balancing is realized without consuming the electric energy of the high-voltage battery, thereby being beneficial to prolonging the service life of the battery pack.
Description
Technical Field
The present application relates to the field of energy storage technologies, and in particular, to a method, an apparatus, a computer device, a storage medium, a computer program product, and a system for balancing capacity of a battery pack.
Background
The battery pack of the energy storage device is generally composed of battery cells connected in series or in parallel. When the batteries are connected in series, since there is a difference in the voltage and capacity of each battery, the battery cell of the lowest capacity may limit the charge or discharge of the entire battery during the charge or discharge of the battery, resulting in a decrease in the overall capacity. To solve this problem, the battery cells in the battery pack are typically subjected to capacity equalization so that other cells that are not yet fully charged or discharged can continue to be charged.
The battery pack of the existing energy storage device generally adopts a passive equalization mode to balance the electric quantity of each battery monomer in the battery pack. However, the passive equalization method mainly realizes equalization by using a battery with high power consumption, requires a long time, and can only perform equalization during the battery charging process, and can not perform passive equalization on the battery which has been put. Therefore, the equalization mode of the battery pack of the existing energy storage device has lower efficiency and is easy to reduce the service life of the battery pack.
Disclosure of Invention
Based on this, there is a need to provide a battery pack capacity balancing method, apparatus, computer device, storage medium, computer program product and system, which solve the technical problems that the balancing method of the battery pack of the existing energy storage device is low in efficiency and the service life of the battery pack is easy to reduce.
In a first aspect, the present application provides a battery capacity balancing method. The method comprises the following steps:
acquiring operation parameters of each battery monomer in the battery pack;
obtaining a plurality of target balanced battery pairs according to the operation parameters of each battery cell; the target balance battery pair comprises a first battery cell and a second battery cell, and the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold value;
centering the target balance battery, and transferring the electric quantity of the first battery monomer to the second battery monomer until the electric energy parameters of the first battery monomer and the second battery monomer meet the balance cut-off condition; the electric quantity of the first battery monomer is larger than that of the second battery monomer.
In one embodiment, the operating parameters include operating voltages, and deriving the plurality of target equalization battery pairs based on the operating parameters of each cell includes:
and if the voltage difference of the two battery cells exceeds the preset voltage difference threshold, taking the two battery cells as a target balanced battery pair.
In one embodiment, if there is a voltage difference between two battery cells exceeding a preset voltage difference threshold, the method includes:
If the voltage difference of two adjacent battery cells exceeds the preset voltage difference threshold, the two adjacent battery cells are used as the target balanced battery pair.
In one embodiment, the operating parameters include battery capacity, and deriving the plurality of target equalization battery pairs based on the operating parameters of each battery cell includes:
sequencing the battery capacities of all the battery monomers to obtain sequencing results;
and obtaining the target balanced battery pair according to the sequencing result.
In one embodiment, the operating parameters include battery capacity, and acquiring the operating parameters of each battery cell in the battery pack includes:
obtaining rated capacity of a battery monomer;
and calibrating the rated capacity of the battery cell according to the initial voltage, the final state voltage and the actual charge and discharge amount in the charge or discharge process of the battery cell to obtain the actual capacity of the battery cell.
In a second aspect, the application further provides a battery pack capacity balancing device. The device comprises:
the operation parameter acquisition module is used for acquiring the operation parameters of each battery monomer in the battery pack;
the target balance battery pair calculation module is used for obtaining a plurality of target balance battery pairs according to the operation parameters of each battery cell; the target balance battery pair comprises a first battery cell and a second battery cell, and the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold value;
The balance control module is used for centering the target balance battery, and transferring the electric quantity of the first battery monomer to the second battery monomer until the electric energy parameters of the first battery monomer and the second battery monomer meet the balance cut-off condition; the electric quantity of the first battery monomer is larger than that of the second battery monomer.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor which when executing the computer program performs the steps of:
acquiring operation parameters of each battery monomer in the battery pack;
obtaining a plurality of target balanced battery pairs according to the operation parameters of each battery cell; the target balance battery pair comprises a first battery cell and a second battery cell, and the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold value;
centering the target balance battery, and transferring the electric quantity of the first battery monomer to the second battery monomer until the electric energy parameters of the first battery monomer and the second battery monomer meet the balance cut-off condition; the electric quantity of the first battery monomer is larger than that of the second battery monomer.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:
Acquiring operation parameters of each battery monomer in the battery pack;
obtaining a plurality of target balanced battery pairs according to the operation parameters of each battery cell; the target balance battery pair comprises a first battery cell and a second battery cell, and the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold value;
centering the target balance battery, and transferring the electric quantity of the first battery monomer to the second battery monomer until the electric energy parameters of the first battery monomer and the second battery monomer meet the balance cut-off condition; the electric quantity of the first battery monomer is larger than that of the second battery monomer.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of:
acquiring operation parameters of each battery monomer in the battery pack;
obtaining a plurality of target balanced battery pairs according to the operation parameters of each battery cell; the target balance battery pair comprises a first battery cell and a second battery cell, and the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold value;
centering the target balance battery, and transferring the electric quantity of the first battery monomer to the second battery monomer until the electric energy parameters of the first battery monomer and the second battery monomer meet the balance cut-off condition; the electric quantity of the first battery monomer is larger than that of the second battery monomer.
In a sixth aspect, the present application further provides a battery capacity equalization system. The system comprises an equalization control device and at least one battery monitoring device, wherein each battery monitoring device is connected with the equalization control device, and the equalization control device and each battery monitoring device are respectively connected with battery monomers in the battery pack;
the battery monitoring device is used for collecting the operation parameters of the battery monomers and sending the operation parameters to the balance control device; the equalization control means is for performing the battery pack capacity equalization control according to the method in any of the above embodiments.
In one embodiment, the equalization control device comprises a controller, an energy storage unit and at least one switch unit, wherein each battery unit is respectively connected with one switch unit, and each switch unit is connected with the energy storage unit and is connected with the controller.
In one embodiment, the battery monitoring device comprises a monitoring module and a wireless communication module, wherein the monitoring module is connected with the battery cell and the wireless communication module, and the wireless communication module is connected with the equalization control device.
In one embodiment, the battery pack capacity balancing system further comprises an information prompt device, and the information prompt device is connected with the balancing control device.
The battery pack capacity balancing method, the battery pack capacity balancing device, the computer equipment, the storage medium, the computer program product and the system are used for obtaining a plurality of target balanced battery pairs according to the operation parameters of all battery monomers in the battery pack by obtaining the operation parameters of all battery monomers. The target balance battery pair comprises a first battery monomer and a second battery monomer, wherein the electric energy parameter difference value of the first battery monomer and the second battery monomer is larger than a preset electric energy parameter threshold value, and the electric quantity of the first battery monomer is larger than the electric quantity of the second battery monomer. And transferring the electric quantity of the first battery cell in the target balance battery pair to the second battery cell until the electric energy parameters of the first battery cell and the second battery cell meet the balance cut-off condition. According to the method, the target balance battery pair is obtained according to the operation parameters of each battery cell, and then the electric quantity of the first battery cell with larger electric quantity in the target balance battery pair is transferred to the second battery cell with smaller electric quantity to realize balance, so that the capacity balance efficiency of the battery pack is improved, and meanwhile, the balance is realized without consuming the electric energy of the battery with high electric quantity, thereby being beneficial to prolonging the service life of the battery pack.
Drawings
FIG. 1 is a flow chart of a method of balancing battery capacity in one embodiment;
FIG. 2 is a schematic diagram illustrating steps of a method for balancing battery capacity according to another embodiment;
FIG. 3 is a flow chart of a method of balancing battery capacity in yet another embodiment;
FIG. 4 is a schematic diagram of the connection relationship of the battery cells according to one embodiment;
fig. 5 is a schematic flow chart of a battery capacity balancing method according to still another embodiment;
FIG. 6 is a detailed flow chart of a battery capacity balancing method according to another embodiment;
fig. 7 is a block diagram showing the structure of a battery capacity equalization apparatus in one embodiment;
FIG. 8 is an internal block diagram of a computer device in one embodiment;
fig. 9 is a schematic diagram of a battery capacity balancing system according to an embodiment;
fig. 10 is a schematic block diagram of a battery capacity equalization system according to another embodiment;
FIG. 11 is a schematic diagram of a battery monitoring device according to one embodiment;
fig. 12 is a schematic diagram of a battery capacity balancing management system according to an embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, as shown in fig. 1, a battery capacity balancing method is provided, where this embodiment is applied to a terminal to illustrate the method, and it is understood that the method may also be applied to a server, and may also be applied to a system including a terminal and a server, and implemented through interaction between the terminal and the server. In this embodiment, the method includes the steps of:
step 102, obtaining operation parameters of each battery cell in the battery pack.
The battery pack comprises at least two battery strings, the battery strings are connected in parallel, and each battery string comprises a plurality of battery cells connected in series. The operating parameters of each cell may include voltage, capacity, charge, current, etc. of each cell.
And 104, obtaining a plurality of target balanced battery pairs according to the operation parameters of each battery cell.
The target balance battery pair is used for representing battery cells needing to be balanced, and comprises a first battery cell and a second battery cell, wherein the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold value. For example, the power parameter difference value may include a voltage difference value of the battery, and the preset power parameter threshold may include a preset voltage difference threshold. Specifically, after the voltages of the battery cells in the battery pack are obtained, if the voltage difference value between any two battery cells is greater than the preset voltage difference threshold, the two battery cells can be used as a target balanced battery pair. In addition, the power parameter difference value may also include a capacity of the battery, and the preset power parameter threshold may include a preset capacity difference threshold. After the battery capacity of each battery cell is obtained, if the capacity difference value between any two battery cells is larger than the preset capacity difference threshold value, the two battery cells can be used as a target balanced battery pair. In particular, when each battery cell in the battery pack is charged or discharged, the battery cell with smaller capacity is generally charged or completely discharged at the earliest, so that the battery cell with the smallest battery capacity can be used as the first battery cell in the target balance battery pair, and then one battery cell is selected as the second battery cell in the target balance battery pair from the rest battery cells meeting the condition that the capacity difference value between the battery cell and the first battery cell is larger than the preset capacity difference threshold value.
And 106, centering the target balanced battery, and transferring the electric quantity of the first battery monomer to the second battery monomer until the electric energy parameters of the first battery monomer and the second battery monomer meet the balanced cut-off condition.
The electric quantity of the first battery cell in the target balance battery pair is larger than that of the second battery cell. The equalization-cutoff condition may include a voltage difference between the first battery cell and the second battery cell being within a preset threshold range. In a more detailed embodiment, the predetermined threshold range is less than or equal to 0.03V.
Specifically, after a plurality of target balance battery pairs are obtained in the process of charging or discharging each battery cell in the battery pack, for each target balance battery pair, the electric quantity of the first battery cell with more current electric quantity in the target balance battery pair can be transferred to the second battery cell with less current electric quantity. In the process of transferring the electric quantity, the voltage difference between the first battery cell and the second battery cell is gradually reduced. When the voltage difference between the first battery cell and the second battery cell reaches a preset threshold range, the equalization control is cut off.
According to the battery pack capacity balancing method, through obtaining the operation parameters of each battery cell in the battery pack, a plurality of target balancing battery pairs are obtained according to the operation parameters of each battery cell. The target balance battery pair comprises a first battery monomer and a second battery monomer, wherein the electric energy parameter difference value of the first battery monomer and the second battery monomer is larger than a preset electric energy parameter threshold value, and the electric quantity of the first battery monomer is larger than the electric quantity of the second battery monomer. And transferring the electric quantity of the first battery cell in the target balance battery pair to the second battery cell until the electric energy parameters of the first battery cell and the second battery cell meet the balance cut-off condition. According to the method, the target balance battery pair is obtained according to the operation parameters of each battery cell, and then the electric quantity of the first battery cell with larger electric quantity in the target balance battery pair is transferred to the second battery cell with smaller electric quantity to realize balance, so that the capacity balance efficiency of the battery pack is improved, and meanwhile, the balance is realized without consuming the electric energy of the battery with high electric quantity, thereby being beneficial to prolonging the service life of the battery pack.
In one embodiment, the operating parameters include operating voltage, as shown in FIG. 2, and step 104 includes step 202.
Step 202, if the voltage difference between the two battery cells exceeds the preset voltage difference threshold, the two battery cells are used as the target balanced battery pair.
Specifically, after the operation voltage of each battery cell in the battery pack is obtained, whether the voltage difference between any two battery cells exceeds a preset voltage difference threshold is first determined. If the balance control exists, the two battery monomers are used as target balance battery pairs, and balance control is performed. If not, the equalization control is not performed. In a more detailed embodiment, the preset voltage difference threshold may be a value greater than or equal to 0.1V.
In this embodiment, by using two battery cells whose voltage difference exceeds a preset voltage difference threshold as a target equalization battery pair, the sensitivity of equalization control can be improved, so that equalization control is performed on the battery cells rapidly.
In one embodiment, as shown in FIG. 3, step 202 includes step 302.
In step 302, if the voltage difference between two adjacent battery cells exceeds the preset voltage difference threshold, the two adjacent battery cells are used as the target balanced battery pair.
Specifically, taking the example that one battery string in fig. 4 includes 6 battery cells connected in series, when the voltage difference between the battery cell No. 3 and the battery cell No. 2 exceeds the preset voltage difference threshold in the charging or discharging process, and the electric quantity of the battery cell No. 3 is greater than the electric quantity of the battery cell No. 2, the battery cell No. 3 can be respectively used as the first battery cell in the target balance battery pair, the battery cell No. 2 is used as the second battery cell in the target balance battery pair, and then the electric quantity of the battery cell No. 3 is transferred to the battery cell No. 2, so that the battery cell No. 3 charges the battery cell No. 2. Further, if in the charging or discharging process, the voltage difference between the No. 3 battery monomer and the No. 4 battery monomer also exceeds the preset voltage difference threshold, and the electric quantity of the No. 3 battery monomer is larger than that of the No. 4 battery monomer, the No. 3 battery monomer and the No. 4 battery monomer can also be a target balanced battery pair, and the electric quantity of the No. 3 battery monomer is transferred to the No. 4 battery monomer, so that the No. 3 battery monomer is charged for the No. 2 battery monomer and the No. 4 battery monomer simultaneously.
In this embodiment, by using two adjacent battery cells as the target equalization battery pair when the voltage difference between the two adjacent battery cells exceeds the preset voltage difference threshold, the charging efficiency of the battery and the service life of the battery can be improved.
In one embodiment, the operating parameters include battery capacity, as shown in FIG. 5, and step 104 includes steps 204 and 205.
And 204, sequencing the battery capacities of the battery monomers to obtain a sequencing result.
The battery capacity of each battery cell includes the rated capacity of each battery cell. The rated capacity of a battery cell refers to the battery capacity at the time of shipment of the battery, and represents the amount of electricity discharged from the battery cell under certain conditions (temperature, terminal voltage, etc.). Specifically, after the battery capacity of each battery cell is obtained, the battery capacity of each battery cell can be ranked from small to large or from large to small, so as to obtain a corresponding ranking result. In a more detailed embodiment, the cell capacities of the individual cells may be ranked using a bubble ranking method.
And 206, obtaining a target balanced battery pair according to the sequencing result.
In general, when each cell in a battery pack is charged or discharged, the cell having a smaller capacity is generally charged or discharged at the earliest. Therefore, in order to improve the equalization efficiency, the equalization control may be performed first on the battery cells having smaller capacities. Specifically, after the battery capacity sequencing result of the battery cells is obtained, the battery cells with adjacent battery capacities can be sequentially used as target balanced battery pairs according to the sequencing result, and balanced control can be performed on the battery pairs. For example, taking an example in which one battery string includes 6 battery cells connected in series in fig. 4, if the result of sorting the battery capacities of the 6 battery cells is that the 1 battery cell < 2 battery cell < 3 battery cell < 4 battery cell < 5 battery cell < 6 battery cell, the 1 battery cell may be first used as the first battery cell in the target balance battery pair, and the 2 battery cell may be used as the second battery cell in the target balance battery pair. When the difference value of the electric energy parameters of the No. 1 battery cell and the No. 2 battery cell is larger than the preset electric energy parameter threshold, the No. 1 battery cell is used for charging the No. 2 battery cell according to the method in the embodiment so as to realize capacity balance.
According to the battery pack capacity balancing method, the battery capacities of the battery monomers are firstly sequenced to obtain a sequencing result, and then the target balancing battery pair is obtained according to the sequencing result, so that the battery monomers with smaller capacities can be balanced and controlled preferentially, the quick positioning of the battery monomers needing to be balanced and controlled preferentially is realized, and the efficiency of balanced and controlled is improved.
In one embodiment, the operating parameters include battery capacity, and as shown in FIG. 6, step 102 includes steps 402 and 403.
Step 402, obtaining the rated capacity of the battery cell.
As the battery ages, the rated capacity of the battery cell may be different from the actual capacity, and thus, the rated capacity of the battery cell needs to be calibrated in time. Specific steps of calibration may refer to step 403.
And step 403, calibrating the rated capacity of the battery cell according to the initial voltage, the final state voltage and the actual charge and discharge amount in the charge or discharge process of the battery cell, so as to obtain the actual capacity of the battery cell.
Wherein the method comprises the steps ofThe initial voltage during the charge or discharge of the battery cell is the open circuit voltage of the battery cell before the start of charge or discharge, denoted as v_open. The final state voltage is the open circuit voltage of the battery cell after the charge or discharge is completed, and is denoted as v_final. The actual charge and discharge amount is the charge amount of the battery cell in the charge process or the discharge amount of the battery cell in the discharge process, and is recorded as Wherein->Representing a charging current or a discharging current.
Specifically, an initial electric quantity q_initial=v_open×c is calculated according to a rated capacity C and an initial voltage v_open of the battery cell; calculating according to the rated capacity C and the final state voltage V_final of the battery cell to obtain final state electric quantity Q_final=V_final×C; and then judging whether the sum of the initial electric quantity and the actual charge-discharge quantity is equal to the last-state electric quantity or not. If equal, the actual capacity c_actual=c of the battery cells is calculated, and if unequal, the actual capacity c_actual=q_actual/v_final of the battery cells is calculated, whereinT represents a charge time or a discharge time.
Further, after the actual capacity of each battery monomer is calculated, sorting can be performed according to the actual capacity of each battery monomer to obtain a sorting result, then a target balanced battery pair is obtained according to the sorting result, and capacity balance control is performed on the target balanced battery pair.
According to the battery pack capacity balancing method, the rated capacity of the battery cells is obtained, the rated capacity of the battery cells is calibrated according to the initial voltage, the final state voltage and the actual charge and discharge amount in the charge or discharge process of the battery cells, the actual capacity of the battery cells is obtained, the more real capacity condition of the battery cells can be obtained, the balancing control efficiency and reliability are improved, and the service life of the battery pack is prolonged.
Based on the same inventive concept, the embodiment of the application also provides a battery pack capacity balancing device for realizing the battery pack capacity balancing method. The implementation of the solution provided by the device is similar to that described in the above method, so the specific limitation in the embodiments of the battery capacity balancing device or devices provided below may be referred to the limitation of the battery capacity balancing method hereinabove, and will not be repeated herein.
In one embodiment, as shown in fig. 7, there is provided a battery pack capacity equalization apparatus 700, comprising: an operation parameter acquisition module 701, a target equalization battery pair calculation module 702 and an equalization control module 703, wherein:
the operation parameter obtaining module 701 is configured to obtain operation parameters of each battery cell in the battery pack.
The target equalization battery pair calculation module 702 is configured to obtain a plurality of target equalization battery pairs according to the operation parameters of each battery cell. The target balance battery pair comprises a first battery cell and a second battery cell, and the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold value.
The balancing control module 703 is configured to center the target balancing battery, and transfer the electric quantity of the first battery cell to the second battery cell until the electric energy parameters of the first battery cell and the second battery cell meet the balancing cutoff condition. Wherein, the electric quantity of the first battery monomer is larger than that of the second battery monomer.
In one embodiment, the operating parameters include an operating voltage, and the target balanced battery pair calculation module 702 is further configured to take two battery cells as the target balanced battery pair if the voltage difference between the two battery cells exceeds a preset voltage difference threshold.
In one embodiment, the target equalization battery pair calculation module 702 is further configured to, if the voltage difference between two adjacent battery cells exceeds a preset voltage difference threshold, use the two adjacent battery cells as the target equalization battery pair.
In one embodiment, the operating parameters include battery capacity, and the target balanced battery pair calculation module 702 includes a ranking unit and a target balanced battery pair calculation unit, wherein:
and the sequencing unit is used for sequencing the battery capacities of the battery monomers to obtain a sequencing result.
And the target balanced battery pair calculation unit is used for obtaining the target balanced battery pair according to the sequencing result.
In one embodiment, the operation parameters include a battery capacity, and the operation parameter obtaining module 701 is further configured to obtain a rated capacity of the battery cell, and calibrate the rated capacity of the battery cell according to an initial voltage, a final state voltage, and an actual charge-discharge amount during a charging or discharging process of the battery cell, so as to obtain an actual capacity of the battery cell.
The above-described respective modules in the battery pack capacity balancing apparatus may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and the internal structure thereof may be as shown in fig. 8. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program when executed by a processor implements a battery capacity balancing method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 8 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In an embodiment, there is also provided a computer device comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, carries out the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (FerroelectricRandom Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (DynamicRandom Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
In one embodiment, as shown in fig. 9, a battery capacity equalization system is provided, which includes an equalization control device 800 and at least one battery monitoring device 900, each battery monitoring device 900 is connected to the equalization control device 800, and the equalization control device 800 and each battery monitoring device 900 are respectively connected to battery cells in the battery. For example, the number of battery monitoring devices 900 may be the same as the number of battery cells in the battery pack, and when the battery pack includes a plurality of battery strings, each battery cell in each battery string may be correspondingly connected with one battery monitoring device 900.
The battery monitoring device 900 is configured to collect the operation parameters of the corresponding battery cells and send the operation parameters to the equalization control device 800, where the equalization control device 800 is configured to perform capacity equalization control of the battery pack according to the method in any of the foregoing embodiments, and specific equalization control steps may refer to the descriptions in the foregoing embodiments and are not repeated herein. In particular, the data transmission between the battery monitoring device 900 and the equalization control device 800 may be implemented by using a wired or wireless communication transmission method.
The battery pack capacity balancing system of the embodiment comprises a balancing control device 800 and at least one battery monitoring device 900, wherein each battery monitoring device 900 is connected with the balancing control device 800, each battery monitoring device 900 is respectively connected with a battery cell in a battery pack, the battery monitoring device 900 is used for collecting operation parameters of the battery cell and sending the operation parameters to the balancing control device 800, and the balancing control device 800 is used for carrying out battery pack capacity balancing control according to the method in any embodiment, so that the automatic balancing of the battery pack capacity can be realized, and the balancing control efficiency is improved.
In one embodiment, as shown in fig. 9, the equalization control device 800 includes a controller, an energy storage unit 810, and at least one switch unit 820, where each battery cell is connected to one switch unit 820, and each switch unit 820 is connected to the energy storage unit 810 and to the controller (not shown).
The controller is used for obtaining the operation parameters of each battery cell, obtaining a plurality of target balanced battery pairs according to the operation parameters of each battery cell, and transferring the electric quantity of a first battery cell in the target balanced battery pairs to a second battery cell. The specific implementation steps comprise: first, the controller controls the switching unit 820 connected to the first battery cell to be turned on, so as to store the electric quantity of the first battery cell in the energy storage unit 810. After the preset time threshold, the controller controls the switch unit 820 connected with the first battery unit to be disconnected, and the switch unit 820 connected with the second battery unit is conducted, so that the electric quantity stored in the energy storage unit 810 is transmitted to the second battery unit. Thereby realizing the transfer of the electric quantity of the first battery cell to the second battery cell in the target balance battery pair. In a more detailed embodiment, the switching unit 820 may include a first switching device through which the positive electrode of the battery cell is connected to the energy storage unit 810 and a second switching device through which the negative electrode of the battery cell is connected to the energy storage unit 810. The energy storage unit 810 may include an inductance or a capacitance.
In this embodiment, the equalization control device 800 includes a controller, an energy storage unit 810 and at least one switch unit 820, each battery unit is connected to one switch unit 820 respectively, each switch unit 820 is connected to the energy storage unit 810 and is connected to the controller, so that the electric quantity of the first battery unit in the target equalization battery pair can be transferred to the second battery unit, and the efficiency of equalization control is improved.
In one embodiment, as shown in fig. 11, the battery monitoring device 900 includes a monitoring module 910 and a wireless communication module 920, where the monitoring module 910 is connected to the battery cell and is connected to the wireless communication module 920, and the wireless communication module 920 is connected to the equalization control device 800.
The monitoring module 910 is configured to obtain an operation parameter of the battery cell, and send the operation parameter to the wireless communication module 920. The wireless communication module 920 is configured to send the operation parameter to the equalization control device 800. It will be appreciated that the equalization control device 800 may also be correspondingly provided with a wireless communication module 920 for implementing wireless communication transmission with the monitoring module 910. In a more detailed embodiment, the wireless communication module 920 may be a bluetooth low energy communication module. The bluetooth low energy communication module transmits the operation parameters of each battery cell to the equalization control device 800 by means of regular broadcasting.
In this embodiment, the battery monitoring device 900 includes a monitoring module 910 and a wireless communication module 920, where the monitoring module 910 is connected with a battery unit and is connected with the wireless communication module 920, and the wireless communication module 920 is connected with the equalization control device 800, so that wireless communication between the battery monitoring device 900 and the equalization control device 800 can be implemented, the setting of communication lines is reduced, the volume of the battery is reduced, and the cost is saved.
In one embodiment, the battery capacity equalization system further includes an information prompting device, and the information prompting device is connected to the equalization control device 800.
The information prompt device may also be directly connected with the battery cell monitoring device to obtain the operation parameters of the battery cell, or may also obtain the operation parameters of the battery cell through the equalization control device 800.
Specifically, the information prompting device can predict faults of the battery cells by adopting a machine learning algorithm according to the operation parameters of the battery cells, and send fault reminding information to a user so as to inform the user of potential problems of the battery pack and avoid the failure or damage of the battery pack. Further, the information prompting device can timely find out a fault point by monitoring the operation parameters of each battery unit in real time and inform the battery unit corresponding to the fault point to a user so as to reduce the maintenance time and cost of the user.
The information prompt device can also monitor and control the charging and discharging process of the battery pack in real time by acquiring the operation parameters of each battery monomer in the charging and discharging process, so as to prevent the battery pack from overcharging and overdischarging. In addition, the information prompting device can be externally connected with other equipment, and the cooperative work and the optimized management among the equipment are realized through the linkage with the other equipment, so that the efficiency and the reliability of the whole energy system are improved.
The battery pack capacity equalization system in this embodiment further includes an information prompt device, where the information prompt device is connected to the equalization control device 800, so that the working state of the battery pack can be fed back to the user in time, and the user can control the battery pack through the information prompt device, so as to improve the utilization efficiency of electric energy.
In order to facilitate an understanding of the above-described battery pack capacity balancing method, apparatus and system, a more detailed description of specific embodiments is provided below.
In one embodiment, the battery pack capacity equalization system includes a battery monitoring device 900 and an equalization control device 800, the battery monitoring device 900 including a monitoring module 910 and a wireless communication module 920. In this embodiment, the wireless communication module 920 is a bluetooth low energy communication module. The equalization control device 800 includes a controller, an energy storage unit 810, and at least one switching unit 820, where in this embodiment, the energy storage unit 810 is an inductor, and each switching unit 820 includes a first switching device and a second switching device. Referring specifically to fig. 10, a battery string includes N series-connected battery cells, and each battery cell is connected in series with a battery monitoring device 900. For example, a first end of the first battery monitoring device 900 is connected to the positive output end of the battery pack, a second end of the first battery monitoring device 900 is connected to the first interface of the battery cell 1, a second interface of the battery cell 1 is connected to the first end of the second battery monitoring device 900, and so on, a second end of the nth battery monitoring device 900 is connected to the first interface of the battery cell N, and a second interface of the battery cell N is connected to the negative output end of the battery pack. In addition, the specific connection relationship between the monitoring module 910 and the wireless communication module 920 in the battery monitoring apparatus 900 may refer to fig. 11. In the figure, the monitoring module 910 has a first end for connecting to the battery cell N-1, a second end for connecting to the battery cell N, and a third end for connecting to the bluetooth low energy communication module.
Each battery cell is connected to the energy storage unit 810 through the switching unit 820. And the positive electrode output end of each battery cell is connected with the first end of the inductor through the first switching device, and the negative electrode output end of each battery cell is connected with the second end of the inductor through the second switching device. The controller is connected to each of the switching units 820 (not shown) for performing capacity equalization control on the battery pack during charge and discharge of the battery pack.
Specifically, when the controller obtains the operation voltage of each battery cell, if the voltage difference between two adjacent battery cells exceeds 0.1V (corresponding to the above-mentioned preset voltage difference threshold), the two adjacent battery cells are used as the target balanced battery pair, and the electric quantity of the first battery cell in the target balanced battery pair is transferred to the second battery cell until the voltage difference between the first battery cell and the second battery cell is balanced to 0.03V (corresponding to the above-mentioned electric energy parameter meeting the balanced cutoff condition). When the controller obtains rated capacity of each battery cell, the rated capacity of each battery cell can be calibrated according to initial voltage, final state voltage and actual charge-discharge amount in the charge or discharge process of the battery cell to obtain actual capacity of each battery cell, then sorting is carried out according to the actual capacity of each battery cell to obtain a sorting result, a target balanced battery pair is obtained according to the sorting result, and electric quantity of a first battery cell in the target balanced battery pair is transferred to a second battery cell until the voltage difference between the first battery cell and the second battery cell is balanced to 0.03V.
In addition, based on the same inventive concept, as shown in fig. 12, the present embodiment further provides a battery capacity balancing management system, which includes a device layer, a data anatomy layer, a data layer, a service layer, a gateway layer, and a presentation layer. The device layer includes a battery pack and the battery monitoring apparatus 900. The data anatomical layer is mainly used for performing data analysis and calculation, the adopted algorithm can comprise a machine learning algorithm, and the specific execution subject can comprise an MCU (corresponding to the information prompting device). The data layer can acquire relevant data of the equipment end, such as the operation parameters of the battery cells, so as to realize corresponding functions. The system comprises a fault diagnosis module, a safety protection module, a cloud platform technology module, an energy management module, an intelligent control module and a system data module. Specifically, the fault diagnosis module is used for monitoring parameters such as the electric quantity and the voltage of each single battery in the battery pack in real time, finding out fault points in time, and reducing maintenance time and cost. The safety protection module is used for monitoring and controlling the charging and discharging processes of the battery pack, preventing overcharge and overdischarge phenomena, and guaranteeing the safety of equipment and personnel. The cloud platform technology module adopts a cloud platform technology to upload information such as operation parameters of each battery cell in the battery pack to the cloud, remote monitoring and control are realized, management and maintenance are convenient, and meanwhile, the operation state of the battery pack is analyzed and optimized by utilizing a big data analysis technology, so that the energy utilization efficiency and the service quality are improved. The energy management module is used for realizing reasonable distribution and utilization of energy through intelligent control and scheduling, improving energy efficiency and reducing cost. And the intelligent control module realizes cooperative work and optimal management among the devices through linkage with other devices, and improves the efficiency and reliability of the whole energy system. The energy source specifically refers to electric energy, due to the fact that consistency problems exist among the battery monomers, the actual capacity, the actual voltage and the charge-discharge cycle performance of each battery monomer are different, the battery pack which is not balanced is judged to be full of the whole battery pack after the battery monomer with lower battery capacity is full, and the discharge principle is reverse, so that reasonable distribution and utilization of electric energy are needed to be achieved through intelligent control and scheduling. The functions in the data layer can be realized by the information prompt device.
The business layer comprises a system management module, a business management module and a transaction management module. The system management module comprises a user management unit, a security management unit, a right management unit and a system monitoring unit. The business management module comprises a chip management unit, a task management unit, a battery management unit, a parameter management unit, a device management unit, a notification management unit and a module management unit. The transaction management module comprises a schedule management unit, a file management unit and a notification management unit. The business layer and the data layer are managed by adopting a permission control and log record mode. The gateway layer comprises a security authentication module, a load balancing module, a service routing module, a fusing degradation module and a flow control module. The display layer comprises an APP, a cloud background and a personal intelligent home.
According to the battery capacity balancing method, the battery cells which are needed to be balanced can be judged quickly by calculating the actual capacity of each battery cell, so that the efficiency of balancing control is improved. Meanwhile, the balance control device 800 in the battery capacity balance system utilizes the magnetic field generated by the inductor to transmit charge, so that energy loss can be reduced, the response speed of the inductor is higher, and the balance control efficiency is further improved. In addition, the battery monitoring device 900 in the battery capacity balancing system adopts bluetooth broadcast communication to transmit the operation parameters of each battery monomer in a periodical broadcast mode, and can also remove the original communication line and reduce the volume of the battery.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A method of battery capacity equalization, the method comprising:
acquiring operation parameters of each battery monomer in the battery pack;
obtaining a plurality of target balanced battery pairs according to the operation parameters of each battery monomer; the target balance battery pair comprises a first battery cell and a second battery cell, and the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold;
Centering the target balanced battery, and transferring the electric quantity of the first battery cell to the second battery cell until the electric energy parameters of the first battery cell and the second battery cell meet balanced cut-off conditions; the electric quantity of the first battery monomer is larger than that of the second battery monomer.
2. The battery capacity equalization method of claim 1, wherein the operating parameters include operating voltages, and wherein the deriving the plurality of target equalization battery pairs based on the operating parameters of each of the battery cells includes:
and if the voltage difference of the two battery cells exceeds a preset voltage difference threshold, taking the two battery cells as the target balanced battery pair.
3. The method for balancing the capacity of a battery pack according to claim 2, wherein if the voltage difference between two battery cells exceeds a preset voltage difference threshold, taking the two battery cells as the target balancing battery pair comprises:
and if the voltage difference of two adjacent battery cells exceeds a preset voltage difference threshold, taking the two adjacent battery cells as the target balanced battery pair.
4. The battery pack capacity equalization method of claim 1, wherein said operating parameters include battery capacity, and said deriving a plurality of target equalization battery pairs from said operating parameters of each cell comprises:
Sequencing the battery capacity of each battery cell to obtain a sequencing result;
and obtaining the target balanced battery pair according to the sequencing result.
5. The method for balancing the capacity of a battery pack according to claim 1, wherein the operation parameters include the capacity of the battery, and the obtaining operation parameters of each battery cell in the battery pack includes:
acquiring rated capacity of the battery monomer;
and calibrating the rated capacity of the battery cell according to the initial voltage, the final state voltage and the actual charge and discharge amount in the charge or discharge process of the battery cell to obtain the actual capacity of the battery cell.
6. A battery pack capacity equalization apparatus, the apparatus comprising:
the operation parameter acquisition module is used for acquiring the operation parameters of each battery monomer in the battery pack;
the target balance battery pair calculation module is used for obtaining a plurality of target balance battery pairs according to the operation parameters of each battery cell; the target balance battery pair comprises a first battery cell and a second battery cell, and the electric energy parameter difference value of the first battery cell and the second battery cell is larger than a preset electric energy parameter threshold;
the balance control module is used for centering the target balance battery, and transferring the electric quantity of the first battery cell to the second battery cell until the electric energy parameters of the first battery cell and the second battery cell meet a balance cut-off condition; the electric quantity of the first battery monomer is larger than that of the second battery monomer.
7. The battery pack capacity balancing system is characterized by comprising a balancing control device and at least one battery monitoring device, wherein each battery monitoring device is connected with the balancing control device, and the balancing control device and each battery monitoring device are respectively connected with battery monomers in a battery pack;
the battery monitoring device is used for collecting the operation parameters of the battery monomers and sending the operation parameters to the balance control device; the equalization control device is used for performing battery capacity equalization control according to the method of any one of claims 1-5.
8. The battery capacity equalization system of claim 7, wherein the equalization control device comprises a controller, an energy storage unit and at least one switch unit, each battery cell is connected to one switch unit, and each switch unit is connected to the energy storage unit and to the controller.
9. The battery pack capacity equalization system of claim 7, wherein said battery monitoring device comprises a monitoring module and a wireless communication module, said monitoring module being connected to said battery cells and to said wireless communication module, said wireless communication module being connected to said equalization control device.
10. The battery pack capacity equalization system of claim 7, further comprising an information presentation device, said information presentation device being coupled to said equalization control device.
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