CN114726040A - Power battery module equalization system and control method thereof - Google Patents

Power battery module equalization system and control method thereof Download PDF

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Publication number
CN114726040A
CN114726040A CN202210375735.7A CN202210375735A CN114726040A CN 114726040 A CN114726040 A CN 114726040A CN 202210375735 A CN202210375735 A CN 202210375735A CN 114726040 A CN114726040 A CN 114726040A
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China
Prior art keywords
module
battery
power
battery module
voltage difference
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CN202210375735.7A
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Chinese (zh)
Inventor
王维林
李宏
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Autel Intelligent Technology Corp Ltd
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Autel Intelligent Technology Corp Ltd
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Priority to CN202210375735.7A priority Critical patent/CN114726040A/en
Publication of CN114726040A publication Critical patent/CN114726040A/en
Priority to PCT/CN2023/081581 priority patent/WO2023197813A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The embodiment of the invention relates to the field of battery equalization design, and discloses a power battery module equalization system and a control method thereof.

Description

Power battery module equalizing system and control method thereof
Technical Field
The embodiment of the invention relates to the technical field of battery equalization design, in particular to a power battery module equalization system and a control method thereof.
Background
At present, in the faults of the power battery pack of the new energy automobile, the faults with unbalanced unit voltage account for more, and most maintenance factories replace modules with unbalanced unit voltage. When a new module is replaced into a battery pack, the voltage of the new module is required to be ensured to be consistent with the voltages of other modules in the battery pack, module balancing equipment is usually adopted to adjust the voltage of the module, and when the voltage of the new module is higher than the voltages of other modules, the new module is discharged; when the voltage of the new module is lower than that of other modules, the new module is charged, and finally the voltage of the new module is adjusted to be consistent with that of other modules.
In implementing the embodiments of the present invention, the inventors found that at least the following problems exist in the above related art: the voltage of the unit in the battery module is unbalanced, and the unit is damaged irreversibly due to the deterioration of the performance of the battery core and needs to be replaced; partly because of the habit of charging, long-term heavy current is charged, the increasing trend of the pressure difference between the electric cores can not be drawn down by the equalizing capability of a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS), the scheme commonly used for solving the problems in the market at present is to add module equalizing equipment in the system for adjustment, the size and the cost of a power BATTERY pack can be greatly increased, and the module equalizing equipment can only realize the function of equalizing control generally.
Disclosure of Invention
The embodiment of the application provides a power battery module balancing system and a control method thereof.
The purpose of the embodiment of the invention is realized by the following technical scheme:
in order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a power battery module balancing system, including: the commercial power conversion module is connected with alternating-current commercial power and configured to output direct current; the strong current management module is connected with the commercial power conversion module and is configured to perform power adjustment on the direct current; the output module is connected with the strong current management module and is configured to output the electric energy after power adjustment; the battery module is connected with the output end of the output module and is configured to be communicated with the output module during charging; the electronic load and/or power transfer module is respectively connected with the battery module and is configured to be communicated with the battery module when the cell voltages of the battery module are unbalanced; the sampling module is connected with the battery module and configured to collect battery data of the battery module; and the micro control unit is respectively connected with the electronic load and the sampling module, is in communication connection with the strong current management module, and is configured to control the on-off of the electronic load and the on-off of a switch tube in the strong current management module according to the battery data.
In some embodiments, the mains conversion module comprises: the filtering module is connected with the alternating current commercial power and is configured to purify the alternating current commercial power; an AC-DC converter connected between the filtering module and the strong current management module and configured to convert the purified AC mains power into DC power; a DC-DC converter connected between the AC-DC converter and the micro control unit and configured to convert the direct current to a low voltage power source to power the micro control unit.
In some embodiments, the strong current management module comprises: the power factor correction module is connected with the commercial power conversion module; the power adjusting module is connected between the power factor correcting module and the output module; and the microcontroller is respectively connected with the power factor correction module, the power adjustment module and the micro control unit and is configured to control the power factor correction module and the power adjustment module to adjust the power of the direct current according to a control instruction issued by the micro control unit.
In some embodiments, the system further comprises: the input end of the line switching module is connected with the battery module through a collection line, and the output end of the line switching module is respectively connected with the sampling module and the electronic load; and the resistance measuring unit is connected with the line switching module.
In some embodiments, the system further comprises: at least two temperature sensors connected with the micro control unit, wherein one temperature sensor is connected with the battery module, and the other temperature sensor is connected with the resistance measuring unit.
In some embodiments, the system further comprises: and the heat dissipation module is connected with the electronic load.
In some embodiments, the system further comprises: and the communication module is connected with the micro control unit, is in communication connection with a cloud platform, and is configured to acquire the module parameters of the battery module through the cloud platform.
In some embodiments, the system further comprises: and the human-computer interaction module is connected with the micro control unit and is configured to acquire the operation and selection of the user.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a method for controlling a power battery module balancing system according to the first aspect, where the method includes: connecting to a cloud platform and acquiring module parameters of the accessed battery module; judging whether the voltage difference between the module units of the battery module is greater than a preset voltage difference threshold value or not; if so, switching on an electronic load and/or a power transfer module to adjust the voltage difference between the power batteries in the battery module so as to enable the voltage difference to be smaller than the preset voltage difference threshold; and executing charging and discharging work according to the module parameters of the battery module.
In some embodiments, the method further comprises: judging whether the voltage difference between the module units of the battery module is smaller than a preset voltage difference range or not; if so, the charging and discharging current of the battery module is increased.
In some embodiments, before the determining whether the voltage difference between the module units of the battery module is greater than a preset voltage difference threshold, the method further includes: collecting battery data of the battery module through a sampling module; judging whether the battery data, the connecting lines of the battery module and/or the resistance of the temperature sensor are abnormal or not so as to determine whether the battery module can be charged and discharged normally or not; if the battery data is abnormal, the connecting line is abnormal and/or the resistance of the temperature sensor is not matched, determining that the battery module cannot be charged and discharged normally; and checking the abnormal state and repairing to enable the battery module to achieve the condition of normal charge and discharge.
In some embodiments, the determining whether the battery data is abnormal to determine whether the battery module can be normally charged and discharged includes: calculating the average voltage of the battery module by a median method or a statistical distribution method; judging whether the average voltage is within a preset voltage range or not; if not, the battery module and the electronic load are connected, and/or the battery module and the power transfer module are connected, so that the battery module is shunted.
In some embodiments, the checking for the abnormal state and repairing to allow the battery module to reach the condition of being normally charged and discharged includes: acquiring charge and discharge voltages and electric quantity of each power battery in the battery module; calculating the maximum deviation value of the charging and discharging voltage of each power battery; judging whether the maximum deviation value is smaller than a preset deviation value or not; if so, determining that the consistency of the battery modules meets the requirement and outputting an analysis result; if not, determining that the consistency of the battery modules does not meet the requirement, screening fault modules and outputting analysis results.
Compared with the prior art, the invention has the beneficial effects that: the system comprises a mains supply conversion module, a strong current management module, an output module, a battery module, an electronic load, a power transfer module, a sampling module and a micro control unit, can be connected to the electronic load and/or the power transfer module to realize balance when the sampling module collects that the pressure difference of each power battery in the battery module is large, and can adjust the output power to carry out quick charging by adjusting the on-off of a switch tube in the strong current management module when the pressure difference of each power battery is small.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic structural diagram of a power battery module balancing system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another power battery module balancing system according to an embodiment of the present invention;
fig. 3(a) is a circuit diagram of equalizing charge of a battery module under multiple channels according to an embodiment of the present invention;
fig. 3(b) is a circuit diagram of equalizing charge of a battery module in a single channel according to an embodiment of the present invention;
fig. 4 is a circuit diagram illustrating a dissipative discharging mode of a multi-channel lower battery module according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a control method of a power battery module balancing system according to a second embodiment of the present invention;
fig. 6 is a schematic flow chart of another control method of a power battery module balancing system according to a second embodiment of the present invention;
fig. 7 is a schematic flowchart of a control method of a power battery module balancing system according to another embodiment of the present invention;
FIG. 8 is a schematic sub-flowchart of step S620 in the control method shown in FIG. 7;
fig. 9 is a schematic sub-flowchart of step S640 in the control method shown in fig. 7.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. Additionally, while functional block divisions are performed in apparatus schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions in apparatus or flowcharts. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to solve the problems that module balancing equipment needs to be added to a battery module with a plurality of power batteries to realize balancing control and the module balancing equipment is single in function at present, the embodiment of the invention provides a power battery module balancing system and a control method thereof, wherein the system can be connected to an electronic load and/or a power transfer module to realize balancing when a sampling module collects that the pressure difference of each power battery in the battery module is large, and output power is adjusted to perform quick charging and discharging by adjusting the on-off of a switching tube in a strong current management module when the pressure difference of each power battery is small, and the system is simple in structure and easy to control; and the system can also carry out consistency evaluation on the battery module according to the battery data collected by the sampling module, thereby giving accurate repair evaluation opinions to users.
Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.
Example one
An embodiment of the present invention provides a power battery module balancing system, please refer to fig. 1, which shows a structure of the power battery module balancing system provided in the embodiment of the present invention, where the power battery module balancing system 100 includes: the system comprises a commercial power conversion module 110, a strong electric management module 120, an output module 130, a battery module 140, an electronic load 150 and/or a power transfer module 160, a sampling module 170 and a micro control unit MCU.
The commercial power conversion module 110 is connected with an alternating current commercial power AC and configured to output direct current; specifically, please refer to fig. 2, which shows a structure of another power battery module balancing system according to an embodiment of the present invention, where the utility power conversion module 110 includes: a filtering module 111 connected to an AC utility power AC and configured to purify the AC utility power AC; an AC-DC converter 112 connected between the filtering module 111 and the strong power management module 120, and configured to convert the purified AC mains AC into DC; a DC-DC converter 113 connected between the AC-DC converter 112 and the micro control unit MCU and configured to convert the direct current into a low voltage power supply to power the micro control unit MCU. Further, the low-voltage power sources in the balancing system 100 for power battery modules according to the embodiment of the present invention may all be supplied by the DC-DC converter 113 to all control parts in the balancing system 100 for power battery modules.
The strong power management module 120 is connected to the commercial power conversion module, and is configured to perform power adjustment on the direct current; specifically, with continued reference to fig. 2, the strong power management module 120 includes: a power factor correction module 121 connected to the commercial power conversion module 110; a power adjustment module 122 connected between the power factor correction module 121 and the output module 130; the microcontroller MCU1 is respectively connected to the power factor correction module 121, the power adjustment module 122 and the micro control unit MCU, and is configured to control the power factor correction module 121 and the power adjustment module 122 to adjust the power of the direct current according to a control command issued by the micro control unit MCU.
The output module 130 is connected to the strong power management module 120, and is configured to output the power-adjusted electric energy, and the output module 130 can provide stable power output for an external load, and eliminate the influence of ripples, loads, and the like on the output, and specifically, the structure, the model, and the like of the output module can be selected according to actual needs.
The battery module 140 is connected to the output end of the output module 130, and is configured to be connected to the output module 130 during charging, the battery module 140 is a combination of a battery or a battery pack, a battery management system BMS may be further disposed in the battery module 140, and the battery management system BMS collects battery data of a single battery or a battery pack and further sends the battery data to the MCU through the collection module 170.
The electronic load 150 is connected with the battery module and is configured to be connected with the battery module when the cell voltages of the battery module are unbalanced; in some embodiments, with continued reference to fig. 2, the system further comprises: a line switching module 151, an input end of which is connected to the battery module 140 through a collection line, and an output end of which is connected to the sampling module 170 and the electronic load 150, respectively; and a resistance measuring unit 152 connected to the line switching module 151. In some embodiments, with continued reference to fig. 2, the system further comprises: and a heat dissipation module 153 connected to the electronic load 150. In addition, in the embodiment of the present invention, the electronic load 150 is used for equalizing charge, the resistance range can be adjusted in a programmable manner, the adjustment range is wide, the equalizing shunt effect is better, and the equalizing efficiency is higher.
Specifically, when charging the battery module 140, please refer to fig. 3(a) and fig. 3(b), which respectively show the circuit design of the battery module 140 during equalizing charge in multiple channels and a single channel, the collection lines output from the battery module 140 may be connected to the sampling module 170 and the electronic load 150 after passing through the line switching module 151, and the temperature sensor 171 may also be connected to the resistance measurement unit in the sampling module 170. During charging, alternating current mains supply AC input is converted by the AC-DC converter 112, adjusted by the power factor correction module 121, and converted by the power adjustment module 122, and then output to the output module 130 to charge the battery module 140, and the magnitude and power of the output current are controlled by the power adjustment module 122 and managed by the independent microcontroller MCU 1.
The power transfer module 160 is connected to the battery module and configured to be connected to the battery module 140 when the cell voltages of the battery module 140 are unbalanced. In embodiments of the present invention, on the one hand, a discharge mode of energy dissipation through the electronic load 150 may be supported; on the other hand, a discharging mode of energy transfer through the power transfer module 160 can be supported, so that energy conservation and environmental protection are achieved.
Specifically, when the battery module 140 is discharged, there are two ways: the discharge mode is controlled by the MCU and can be selected or configured by a user through the UI of the human-computer interaction module 190. Referring to fig. 4, a circuit design of a multi-channel battery module 140 during discharging in a dissipative manner is shown, where an electronic load 150 is connected to a positive-negative circuit, power dissipation is performed by the electronic load 150, when discharging, charging output is turned off, and the battery module 140 outputs electric energy to the electronic load 150 or the power transfer module 160 to discharge the battery module 140; when power transfer type discharging is adopted, please continue to refer to fig. 2, the electric energy is mainly dissipated to the external power component through the power transfer module 160, which may be an energy storage module or a DC-AC module, and returns the electric energy to the grid.
The sampling module 170 is connected to the battery module and configured to collect the battery data of the battery module 140, the sampling module 170 may be a collector, the battery data includes voltage data and temperature data, and the sampling module 170 may collect the voltage and temperature of the battery module 140 and transmit the collected voltage and temperature data to the MCU. In the embodiment of the present invention, the flexible voltage acquisition interface configuration is adopted, so as to support the diagnosis and detection of the battery data such as the voltage and the temperature in the battery module 140. Further, the MCU may also collect battery data through the sampling module 170 before charging and discharging to realize fault detection and diagnosis functions, and analyze the module fault.
In some embodiments, with continued reference to fig. 2, the system further comprises: at least two temperature sensors 171 connected with the micro control unit MCU, one temperature sensor 171a is connected with the battery module 140, and the other temperature sensor 171b is connected with the resistance measuring unit 152.
The MCU is connected to the electronic load 150 and the sampling module 170, and is in communication with the heavy current management module 120, and is configured to control on/off of the electronic load 150 and on/off of a switch in the heavy current management module 120 according to the battery data. In the power battery module balancing system 100, the main operation logic and data management of all the units are handled by the MCU, including the control logic and power configuration data of the MCU1 for heavy current management, and the safety monitoring during operation is also managed by the MCU monitoring the current, voltage, and temperature of the system.
In some embodiments, with continued reference to fig. 2, the system further comprises: the communication module 180 is connected to the MCU and the cloud platform 200, and is configured to acquire the module parameters of the battery module 140 through the cloud platform 200. In the embodiment of the invention, parameters required for charging and discharging are stored in the cloud platform, and the MCU is communicated with the cloud platform through the communication module 180 so as to obtain the operation parameters.
In some embodiments, with continued reference to fig. 2, the system further comprises: and the human-computer interaction module 190 is connected with the micro control unit MCU and is configured to acquire the operation and selection of the user. In the embodiment of the present invention, a user operates the device through the human-computer interaction module 190, where the human-computer interaction module 190 may be an electronic product capable of implementing human-computer interaction, such as a Liquid Crystal Display (LCD), a touch panel (touch panel, TP), and specifically, may be selected according to actual needs.
Specifically, please refer to fig. 2 continuously, when charging is needed, the charging loop is at least composed of the filtering module 111, the AC-DC converter 112, the power factor correction module 121, and the output module 130, the filtering module 111 purifies the input AC mains supply AC and prevents the influence of the device on the power grid, the AC-DC converter 112 converts the input AC power into DC power through rectification and filtering, the power factor correction module 121 is implemented by a switching power supply, dynamically adjusts the output voltage according to the output current requirement, and the output module 130 provides stable power output for the external load, and eliminates the influence of ripple, load, and the like on the output.
Example two
An embodiment of the present invention provides a method for controlling a power battery module balancing system according to the first embodiment, please refer to fig. 5, which shows a flow of the method for controlling the power battery module balancing system according to the first embodiment of the present invention, where the method includes, but is not limited to, the following steps:
step S100: connecting to a cloud platform and acquiring module parameters of the accessed battery module;
in the embodiment of the invention, the module parameters of the power batteries in the battery modules or the battery modules with different types are stored in the cloud platform, when a system is connected with a new battery module or a new power battery, the serial number or the type of the battery module or the power battery is read or identified, and the module parameters of the battery module or the power battery are inquired through the cloud platform so as to further configure data such as battery capacity, battery module organization structures, charging and discharging parameters and the like, so that more battery types are supported, and the expandability of the system is improved.
Specifically, the module parameters of the battery module at least include a cell material, an organization structure, capacity, charging and discharging parameters and the like, the data are stored in the cloud platform, the data can be indexed by keywords formed by an automobile brand Make, an automobile Model, a battery type and/or a module type, or the data can be indexed by module codes, a user selects the parameters according to a repaired automobile Model, or inquires the parameters of the battery module according to the codes on the battery module, and the parameters of the maximum voltage, the minimum voltage, the charging current and the like of a unit are used as important parameters for controlling the charging flow. The module parameters of the battery module can be seen in the following table 1:
Figure BDA0003590311010000121
TABLE 1
Step S200: judging whether the voltage difference between module units of the battery module is greater than a preset voltage difference threshold value or not; if yes, jumping to step S300;
in the embodiment of the invention, the main power input and output of charging and discharging are completed by connecting the anode main line and the cathode main line, and the balancing function is executed by current shunting through the acquisition line. Limited by the current carrying capacity of the acquisition line of the battery module, the equalizing current ratio is small and generally does not exceed 2A current, and if the voltage difference between the module units is too large, the variation trend of the voltage difference between the units can be increased by large-current charging and discharging, so that when the voltage difference between the module units of the battery module is larger than the preset voltage difference range, only small-current charging and discharging can be carried out, and the voltage difference between the battery modules is adjusted by the equalizing function of the step S300.
Step S300: switching on an electronic load and/or a power transfer module to adjust voltage difference between the power batteries in the battery module so that the voltage difference is smaller than the preset voltage difference threshold;
in the embodiment of the invention, when the consistency of the power batteries is poor, the voltage difference between the module units of the battery module is large, and at the moment, the balancing mode of the power battery module balancing system needs to be switched to adjust the voltage difference between the power batteries in the battery module.
Step S400: and executing charging and discharging work according to the module parameters of the battery module.
In the embodiment of the invention, after the module parameters of the battery module are obtained and whether the equalizing charge is needed or not is determined, the charging and discharging work is executed according to the module parameters needed when the battery module works in different modes.
In some embodiments, the power battery module balancing system further supports a high-current fast charge-discharge mode, please refer to fig. 6, which shows a flow of another control method of the power battery module balancing system according to the embodiments of the present invention, and in the step S400, the method further includes:
step S510: judging whether the voltage difference between the module units of the battery module is smaller than a preset voltage difference range or not;
step S520: if so, the charging and discharging current of the battery module is increased.
In the embodiment of the present invention, if the voltage difference between the units is relatively small, that is, smaller than the preset voltage difference range, the module may be charged and discharged with a large current, so that the module reaches the target voltage as soon as possible, and the specific charging and discharging current configuration is configured to the microcontroller MCU1 after the micro control unit MCU in the first embodiment queries from the cloud platform, and the microcontroller MCU1 performs power adjustment. The preset pressure difference range can be set according to actual needs, for example, 2A.
It should be noted that, by the control method provided by the embodiment of the present invention, the equalization mode and the fast charging mode may be dynamically switched: the micro control unit MCU can continuously detect the voltage of each cell, if the voltage difference change between the cells is detected to be increased and exceeds an allowable voltage difference threshold value, such as 20mv, the mode is switched to an equalization mode, and the equalization charging and discharging are realized through the steps S200 to S300; if the voltage difference between the units is adjusted to a small range, such as 5mv, the charging mode can be switched to the high-current charging mode, and the high-current rapid charging and discharging can be realized through steps S510 to S520. Further, before the large current fast charging and fast discharging, the battery consistency may be detected through the following steps S641 to S645, and when the battery consistency is good, the mode may be switched to the fast charging and fast discharging mode.
In some embodiments, please refer to fig. 7, which shows a flow of a control method of a power battery module balancing system according to another embodiment of the present invention, and between the step S200, the method further includes:
step S610: collecting battery data of the battery module through a sampling module;
in the embodiment of the present invention, before charging and discharging, the MCU as described in the first embodiment further needs to request the sampling module 170 to test the battery data such as the initial voltage and temperature of the battery module 140, preliminarily analyze the module status, and determine the strategy that can be adopted.
Step S620: judging whether the battery data, the connecting lines of the battery module and/or the resistance of the temperature sensor are abnormal or not so as to determine whether the battery module can be charged and discharged normally or not;
specifically, referring to fig. 8, which shows a sub-flow of step S620 in the control method shown in fig. 7, the determining whether the battery data is abnormal to determine whether the battery module can be normally charged and discharged includes:
step S621: calculating the average voltage of the battery module by a median method or a statistical distribution method;
step S622: judging whether the average voltage is within a preset voltage range or not; if not, the user can not select the specific application,
step S623: and connecting the battery module with the electronic load and/or connecting the battery module with the power transfer module to shunt the battery module.
In the embodiment of the present invention, if it is assumed that the total charging current input by the charger is Iall, whether the electronic load 150 is connected is controlled by the switching element, and the micro control unit MCU programs and sets the shunt current ibalane of the electronic load 150, the charging current is Icharge-ibalane, and the average voltage of the module may be calculated by using a median method or a statistical distribution method, and if the voltage of a certain unit exceeds the average voltage within a certain preset voltage range, for example, 5mv, the switching element needs to be turned on to shunt, so as to slow down the charging speed, and the calculation formula of the magnitude of the shunt current is as follows:
Ibalance＝Iall·△Vi/max△V
where Δ Vi represents the difference between the ith cell voltage and the average voltage, and max Δ V represents the maximum voltage difference of the module.
Step S630: if the battery data is abnormal, the connecting line is abnormal and/or the resistance of the temperature sensor is not matched, determining that the battery module cannot be charged and discharged normally;
in the embodiment of the present invention, if there is an abnormality in the connection line of the battery module or the resistances of the temperature sensors are not matched, further charging and discharging operations cannot be performed, and further, the system further has a module fault detection and diagnosis function, and a module fault can be analyzed before charging and discharging through step S640.
Step S640: and checking the abnormal state and repairing to enable the battery module to achieve the condition of normal charge and discharge.
Specifically, the method for checking and repairing the abnormal state of each module is shown in table 2 below:
Figure BDA0003590311010000151
TABLE 2
Further, in the embodiment of the present invention, although the equalizing function can level the voltage difference between different cells, if the voltage is unbalanced due to the difference in aging degradation between individual cells, the voltage difference between the cells may occur in the near future even if the equalization repair is performed. Therefore, in the process of charging and discharging, the consistency among the battery monomers can be analyzed according to the change rule of the charging and discharging electric quantity and the voltage, and the repairing effect of the battery core is more accurately analyzed. Specifically, referring to fig. 9, which shows a sub-flow of step S640 in the control method shown in fig. 7, the checking the abnormal state and repairing to make the battery module reach a condition capable of normal charging and discharging further includes:
step S641: acquiring charge and discharge voltages and electric quantity of each power battery in the battery module;
step S642: calculating the maximum deviation value of the charging and discharging voltage of each power battery;
step S643: judging whether the maximum deviation value is smaller than a preset deviation value;
step S644: if so, determining that the consistency of the battery modules meets the requirement and outputting an analysis result;
step S645: if not, determining that the consistency of the battery modules does not meet the requirement, screening fault modules and outputting analysis results.
In the embodiment of the invention, whether the voltage change range and the electric quantity change range are consistent or not can be detected in the same voltage reference, if so, the capacities among the monomers are consistent, otherwise, the capacities of the monomers are inconsistent. Specifically, firstly, the charging and discharging voltage Vi and the charging and discharging electric quantity Qi of each power battery ti in the battery module need to be sampled, and preferably, the sampling interval can be set to 100 us; secondly, a plurality of reference voltages Va, Vb and Vc … are found between a charging voltage range Vmin and Vmax, the reference voltages Va, Vb and Vc … are divided into N voltage intervals, the width of each voltage interval can be 20mv, and then charging and discharging electricity quantity Q (i) is obtained through calculation, wherein the calculation formula of the charging and discharging electricity quantity Q (i) is as follows:
Q(i)＝∫I(t)dt/C
further, in the actual calculation, a continuous accumulation mode is adopted for calculation, and after the above formula is mathematically transformed, the discrete scheme calculation formula of the charge and discharge electric quantity q (i) is as follows:
Q(i)＝∑I(t)·ti/C
wherein Q (i) represents charge/discharge capacity, I (t) represents charge/discharge current, ti represents charge/discharge time, and C represents charge/discharge constant.
And finally, calculating the maximum deviation of the charging and discharging electric quantity Q (i) in each voltage interval, if the deviation is smaller than a certain threshold value, for example, the maximum deviation delta Q is smaller than a preset deviation value of 0.5%, namely the delta Q is smaller than 0.5%, the battery consistency can be considered to meet the requirement, otherwise, the consistency can not meet the requirement, and specifically, the setting of the preset deviation value can be selected according to actual requirements.
And, the analysis result may be the failure analysis parameters and contents as described in table 2 above, and may be specifically selected and set according to actual needs.
The embodiment of the invention provides a power battery module balancing system and a control method thereof, wherein the system comprises a mains supply conversion module, a strong current management module, an output module, a battery module, an electronic load, a power transfer module, a sampling module and a micro control unit, the system can be connected into the electronic load and/or the power transfer module to realize balancing when the sampling module acquires that the pressure difference of each power battery in the battery module is large, and the output power is adjusted to carry out quick charging by adjusting the on-off of a switch tube in the strong current management module when the pressure difference of each power battery is small.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (13)

1. The utility model provides a power battery module equalizing system which characterized in that includes:
the commercial power conversion module is connected with alternating-current commercial power and configured to output direct current;
the strong current management module is connected with the commercial power conversion module and is configured to perform power adjustment on the direct current;
the output module is connected with the strong current management module and is configured to output the electric energy after power adjustment;
the battery module is connected with the output end of the output module and is configured to be communicated with the output module during charging;
the electronic load and/or power transfer module is respectively connected with the battery module and is configured to be communicated with the battery module when the cell voltages of the battery module are unbalanced;
the sampling module is connected with the battery module and configured to collect battery data of the battery module;
and the micro control unit is respectively connected with the electronic load and the sampling module, is in communication connection with the strong current management module, and is configured to control the on-off of the electronic load and the on-off of a switch tube in the strong current management module according to the battery data.
2. The system of claim 1, wherein the utility power conversion module comprises:
the filtering module is connected with the alternating current commercial power and is configured to purify the alternating current commercial power;
an AC-DC converter connected between the filtering module and the strong current management module and configured to convert the purified AC mains power into DC power;
a DC-DC converter connected between the AC-DC converter and the micro control unit and configured to convert the direct current to a low voltage power source to power the micro control unit.
3. The system of claim 1, wherein the strong power management module comprises:
the power factor correction module is connected with the commercial power conversion module;
the power adjusting module is connected between the power factor correcting module and the output module;
and the microcontroller is respectively connected with the power factor correction module, the power adjustment module and the micro control unit and is configured to control the power factor correction module and the power adjustment module to adjust the power of the direct current according to a control instruction issued by the micro control unit.
4. The system according to any one of claims 1-3, further comprising:
the input end of the line switching module is connected with the battery module through a collection line, and the output end of the line switching module is respectively connected with the sampling module and the electronic load;
and the resistance measuring unit is connected with the line switching module.
5. The system of claim 4, further comprising:
at least two temperature sensor with the little the control unit is connected, exist one temperature sensor with the battery module is connected, exist another temperature sensor with resistance measurement unit connects.
6. The system of claim 5, further comprising:
and the heat dissipation module is connected with the electronic load.
7. The system according to any one of claims 1-3, further comprising:
and the communication module is connected with the micro control unit, is in communication connection with a cloud platform, and is configured to acquire the module parameters of the battery module through the cloud platform.
8. The system according to any one of claims 1-3, further comprising:
and the human-computer interaction module is connected with the micro control unit and is configured to acquire the operation and selection of the user.
9. A method for controlling a balancing system for power battery modules according to any one of claims 1 to 8, characterized in that the method comprises:
connecting to a cloud platform and acquiring module parameters of the accessed battery module;
judging whether the voltage difference between the module units of the battery module is greater than a preset voltage difference threshold value or not;
if so, switching on an electronic load and/or a power transfer module to adjust the voltage difference between the power batteries in the battery module so as to enable the voltage difference to be smaller than the preset voltage difference threshold;
and executing charging and discharging work according to the module parameters of the battery module.
10. The control method according to claim 9, characterized in that the method further comprises:
judging whether the voltage difference between the module units of the battery module is smaller than a preset voltage difference range or not;
if so, the charging and discharging current of the battery module is increased.
11. The control method according to claim 9,
before the step of judging whether the voltage difference between the module units of the battery module is greater than a preset voltage difference threshold, the method further comprises the following steps:
collecting battery data of the battery module through a sampling module;
judging whether the battery data, the connecting line of the battery module and/or the resistance of the temperature sensor are abnormal or not so as to determine whether the battery module can be normally charged and discharged or not;
if the battery data is abnormal, the connecting line is abnormal and/or the resistance of the temperature sensor is not matched, determining that the battery module cannot be charged and discharged normally;
and checking the abnormal state and repairing to enable the battery module to achieve the condition of normal charge and discharge.
12. The control method according to claim 11,
the judging whether the battery data is abnormal or not to determine whether the battery module can be normally charged and discharged comprises the following steps:
calculating the average voltage of the battery module by a median method or a statistical distribution method;
judging whether the average voltage is within a preset voltage range or not;
if not, the battery module and the electronic load are connected, and/or the battery module and the power transfer module are connected, so that the battery module is shunted.
13. The control method according to claim 11,
the checking of the abnormal state and the repair so that the battery module can be normally charged and discharged includes:
acquiring charge and discharge voltages and electric quantity of each power battery in the battery module;
calculating the maximum deviation value of the charging and discharging voltage of each power battery;
judging whether the maximum deviation value is smaller than a preset deviation value;
if so, determining that the consistency of the battery modules meets the requirement and outputting an analysis result;
if not, determining that the consistency of the battery modules does not meet the requirement, screening fault modules and outputting analysis results.
CN202210375735.7A 2022-04-11 2022-04-11 Power battery module equalization system and control method thereof Pending CN114726040A (en)

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WO2023197813A1 (en) * 2022-04-11 2023-10-19 深圳市道通科技股份有限公司 Power battery module equalization system and control method therefor
CN117375155A (en) * 2023-10-11 2024-01-09 新乡创想自动化科技有限公司 New energy power battery balancing instrument and power battery balancing method

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CN202094677U (en) * 2011-06-02 2011-12-28 襄阳群龙汽车部件股份有限公司 Automobile power battery efficient charging equipment
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CN104485717B (en) * 2014-12-30 2017-06-13 广州市香港科大霍英东研究院 A kind of circuit of battery pack balancing and its equalization methods
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CN114726040A (en) * 2022-04-11 2022-07-08 深圳市道通科技股份有限公司 Power battery module equalization system and control method thereof

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WO2023197813A1 (en) * 2022-04-11 2023-10-19 深圳市道通科技股份有限公司 Power battery module equalization system and control method therefor
CN117375155A (en) * 2023-10-11 2024-01-09 新乡创想自动化科技有限公司 New energy power battery balancing instrument and power battery balancing method

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