CN117124924A - Energy storage system and method for new energy automobile - Google Patents

Energy storage system and method for new energy automobile Download PDF

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Publication number
CN117124924A
CN117124924A CN202311096321.1A CN202311096321A CN117124924A CN 117124924 A CN117124924 A CN 117124924A CN 202311096321 A CN202311096321 A CN 202311096321A CN 117124924 A CN117124924 A CN 117124924A
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CN
China
Prior art keywords
battery
battery module
target
photovoltaic
voltage
Prior art date
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Pending
Application number
CN202311096321.1A
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Chinese (zh)
Inventor
谢鸿
曹玉棋
史来锋
吴肇苏
李佳佳
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Dongfeng Motor Group Co Ltd
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Dongfeng Motor Group Co Ltd
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Filing date
Publication date
Application filed by Dongfeng Motor Group Co Ltd filed Critical Dongfeng Motor Group Co Ltd
Priority to CN202311096321.1A priority Critical patent/CN117124924A/en
Publication of CN117124924A publication Critical patent/CN117124924A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K1/00—Arrangement or mounting of electrical propulsion units
    • B60K1/04—Arrangement or mounting of electrical propulsion units of the electric storage means for propulsion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/66—Arrangements of batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/22—Balancing the charge of battery modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L8/00—Electric propulsion with power supply from forces of nature, e.g. sun or wind
    • B60L8/003—Converting light into electric energy, e.g. by using photo-voltaic systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides an energy storage equalization system and method of a new energy automobile, wherein the system comprises the following steps: the power battery pack comprises at least one battery module, and the voltage of each battery module is matched with the output voltage of the photovoltaic system; the switch controller is used for carrying out switch control on a charging circuit between the photovoltaic system and at least one battery module; the battery management system is used for detecting battery information of at least one battery module, determining required charging voltage and a target battery module to be charged based on the battery information of the at least one battery module, and feeding back the required charging voltage to the photovoltaic controller; and controlling the switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module to be charged; and the photovoltaic controller is used for storing energy for the target battery module based on the charging voltage required by the target battery module.

Description

Energy storage system and method for new energy automobile
Technical Field
The application relates to the field of new energy automobiles, in particular to an energy storage equalization system and method of a new energy automobile.
Background
One type of input to new energy automobiles is a photovoltaic system. If the output of the photovoltaic system is stored in a new energy power battery pack, the difficulty is that the unstable low voltage photovoltaic output is converted into a stable high voltage output, and components such as an On Board Charger (OBC), a boost DCDC module (Direct Current to Direct Current Converter, DCDC) and an external buffer battery may be required, and the system is complex and requires additional cost.
Disclosure of Invention
In view of this, the embodiment of the application at least provides an energy storage equalization system and method for a new energy automobile.
The technical scheme of the embodiment of the application is realized as follows:
in one aspect, an embodiment of the present application provides an energy storage equalization system for a new energy automobile, where the system includes:
the power battery pack provides a power battery for the new energy automobile and stores energy output by the photovoltaic system; the power battery pack comprises at least one battery module, and the voltage of each battery module is matched with the output voltage of the photovoltaic system;
the switch controller is used for carrying out switch control on the charging circuit between the photovoltaic system and the at least one battery module;
the battery management system is used for detecting battery information of the at least one battery module in the process that the photovoltaic system stores energy for the power battery pack, determining required charging voltage and a target battery module required to be charged based on the battery information of the at least one battery module, and feeding back the required charging voltage to the photovoltaic controller; and controlling the switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module to be charged;
and the photovoltaic controller is used for storing energy for the target battery module based on the charging voltage required by the target battery module.
In another aspect, an embodiment of the present application provides a method for balancing energy storage of a new energy automobile, where the method includes: the battery management system of the automobile detects battery information of at least one battery module in the process that the photovoltaic system stores energy for the power battery pack; the battery management system determines the charging voltage required by a target battery module to be charged based on the battery information of the at least one battery module, and feeds back the charging voltage required by the target battery module to the photovoltaic controller; and controlling a switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module; the photovoltaic controller stores energy for the target battery module based on the charging voltage required by the target battery module; and the switch controller is used for carrying out switch control on a charging circuit between the photovoltaic system and the at least one battery module.
In the embodiment of the application, firstly, the power battery pack comprises at least one battery module, and the voltage of each battery module is matched with the output voltage of the photovoltaic system, so that a high-capacity external independent energy storage unit is not needed, the cost is saved, and the energy storage capacity is obviously improved. And secondly, the charging circuit between the photovoltaic system and at least one battery module is subjected to switching control through the switching controller, so that dynamic series-parallel combination of the battery modules can be realized, different battery pack voltages can be obtained, and the compatibility of charging and discharging scenes of the automobile battery pack can be realized. Then, detecting battery information of at least one battery module through a battery management system, determining required charging voltage and a target battery module to be charged, and feeding back the required charging voltage to a photovoltaic controller; and controlling the switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module to be charged; like this, can realize that photovoltaic output stores to the power battery package directly, also utilize photovoltaic output to carry out the module to the power battery package simultaneously and balance, improved performance, capacity and the life-span of battery. Finally, the electric energy output by the photovoltaic system is stored for the target battery module based on the charging voltage required by the target battery module through the photovoltaic controller, so that a high-cost boosting/reducing DCDC module is not needed, the electric design of the whole vehicle can be greatly simplified, the number of parts of the whole vehicle is reduced, the weight is saved, and the cost of the whole vehicle is saved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic flow chart of an energy storage equalization system of a new energy automobile according to an embodiment of the present application;
fig. 2A is a schematic structural diagram of a power battery pack of an energy storage equalization system of a new energy automobile according to an embodiment of the present application, where the power battery pack includes two battery modules;
fig. 2B is a schematic structural diagram of a power battery pack of an energy storage equalization system of a new energy automobile according to an embodiment of the present application, where the power battery pack includes three battery modules;
fig. 2C is a schematic structural diagram of a power battery pack of an energy storage equalization system of a new energy automobile according to an embodiment of the present application, including four battery modules;
fig. 2D is a schematic structural diagram of a power battery pack of an energy storage equalization system of a new energy automobile according to an embodiment of the present application, where the power battery pack includes five battery modules;
fig. 3 is a schematic structural diagram of an energy storage balancing system of a new energy automobile including a first load and a second load according to an embodiment of the present application;
fig. 4A is a schematic flow chart of an energy storage balancing method of a new energy automobile according to an embodiment of the present application;
fig. 4B is a flowchart of step S402 according to an embodiment of the present application.
Detailed Description
The technical solution of the present application will be further elaborated with reference to the accompanying drawings and examples, which should not be construed as limiting the application, but all other embodiments which can be obtained by one skilled in the art without making inventive efforts are within the scope of protection of the present application.
In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.
It should be noted that the term "first\second\third" related to the embodiments of the present application is merely to distinguish similar objects, and does not represent a specific order for the objects, it being understood that the "first\second\third" may interchange a specific order or sequencing, where allowed, so that the embodiments of the present application described herein can be implemented in an order other than illustrated or described herein.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which embodiments of the application belong unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
To assist in understanding the present application, before describing embodiments of the present application, the following explanation is given to terms appearing in the present application:
the State Of Charge (SOC) Of the battery, which reflects the remaining capacity Of the battery, is defined numerically as the ratio Of the remaining capacity to the battery capacity, and is often expressed as a percentage. The value range is 0-1, and the battery is completely discharged when soc=0 and completely full when soc=1.
And the battery management system (Battery Management System, BMS) is used for detecting the system state of each battery module, including but not limited to temperature, SOC state, voltage and other information, judging the unbalanced state among the modules according to the information, and giving out a control signal for balancing the battery modules.
The power battery pack, the original power battery of the new energy automobile, can store the photovoltaic output energy for a long time due to the larger capacity (50-100 kilowatt-hours). The power battery pack comprises at least one battery module, and the voltage of each battery module is matched with the output voltage of the photovoltaic system, wherein the matching of the output voltage of the photovoltaic system refers to matching of the lowest voltage output by the photovoltaic system.
The switch controller is used for realizing dynamic series-parallel combination of the battery modules according to the control signal of the battery management system to obtain different battery pack voltages and realize the battery equalization and charge-discharge functions of the photovoltaic output;
and the photovoltaic controller is used for controlling photovoltaic power and stabilizing power output.
The embodiment of the application firstly provides an energy storage equalization system of a new energy automobile, as shown in fig. 1, the system comprises:
the power battery pack 101 provides a power battery for the new energy automobile and stores energy output by the photovoltaic system; the power battery pack comprises at least one battery module, and the voltage of each battery module is matched with the output voltage of the photovoltaic system;
a switch controller 102 for performing switch control on a charging circuit between the photovoltaic system and the at least one battery module;
the battery management system 103 is configured to detect battery information of the at least one battery module during the process that the photovoltaic system stores energy for the power battery pack, determine a required charging voltage and a target battery module that needs to be charged based on the battery information of the at least one battery module, and feed back the required charging voltage to the photovoltaic controller; and controlling the switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module to be charged;
and the photovoltaic controller 104 is configured to store energy for the target battery module based on the charging voltage required by the target battery module.
Here, the voltage of each battery module matches the lowest output voltage of the photovoltaic system, and generally the output voltage of the photovoltaic system is in a voltage range, for example, 12 volts (V) to 48V, and when implemented, the voltage of the battery module matches the lowest output voltage of the photovoltaic system, 12V.
The battery module refers to a module formed when a plurality of battery cells are packaged together by the same shell frame and are connected with the outside through a uniform boundary. Battery information is various parameters reflecting battery status, including but not limited to temperature, SOC status, voltage, etc. SOC refers to the state of charge of a battery, and is used to reflect the remaining capacity of the battery, and is defined numerically as the ratio of the remaining capacity to the battery capacity, commonly expressed as a percentage. The value range is 0-1, and the battery is completely discharged when soc=0 and completely full when soc=1.
The battery management system monitors the state of each battery module in the power battery pack in real time in the process that the photovoltaic system stores energy for the power battery pack, acquires battery information, and determines a target battery module to be charged and a required charging voltage based on the acquired current battery information of the battery module. Meanwhile, the target battery module to be charged is sent to the switch controller in the form of a control signal, and the switch controller changes the connection state of the battery module by opening or closing a switch of the corresponding battery module based on the control signal, so that the dynamic series-parallel combination of the battery modules is realized, different battery pack voltages are obtained, and the battery pack voltage is suitable for different application scenes.
Further, the photovoltaic controller is connected with each battery module through the switch controller, the photovoltaic controller is used for photovoltaic power control and stable power output, the battery management system feeds back required charging voltage to the photovoltaic controller, and the photovoltaic controller outputs the required charging voltage of the target battery module to be charged according to an instruction sent by the battery management system, so that the target battery module is charged, and the power battery pack is stored with energy.
In the embodiment of the application, firstly, the power battery pack comprises at least one battery module, and the voltage of each battery module is matched with the output voltage of the photovoltaic system, so that a high-capacity external independent energy storage unit is not needed, the cost is saved, and the energy storage capacity is obviously improved. And secondly, the charging circuit between the photovoltaic system and at least one battery module is subjected to switching control through the switching controller, so that dynamic series-parallel combination of the battery modules can be realized, different battery pack voltages can be obtained, and the compatibility of charging and discharging scenes of the automobile battery pack can be realized. Then, detecting battery information of at least one battery module through a battery management system, determining required charging voltage and a target battery module to be charged, and feeding back the required charging voltage to a photovoltaic controller; and controlling the switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module to be charged; like this, can realize that photovoltaic output stores to the power battery package directly, also utilize photovoltaic output to carry out the module to the power battery package simultaneously and balance, improved performance, capacity and the life-span of battery. Finally, the electric energy output by the photovoltaic system is stored for the target battery module based on the charging voltage required by the target battery module through the photovoltaic controller, so that a high-cost boosting/reducing DCDC module is not needed, the electric design of the whole vehicle can be greatly simplified, the number of parts of the whole vehicle is reduced, the weight is saved, and the cost of the whole vehicle is saved.
In some embodiments, the battery information includes an SOC of a battery, and the battery management system is further configured to read, in real time, an SOC value of the at least one battery module, and determine, as the target battery module, a battery module having an SOC value smaller than a preset first threshold value when it is determined that the at least one battery is in an unbalanced state based on the SOC value of the at least one battery module.
Here, the battery modules are in an unbalanced state, and the voltages of the battery modules are not equal when the battery modules are connected in series, so that the voltage states of the battery modules are kept consistent, and the battery modules in the power battery pack are prevented from being overcharged or overdischarged, so that the service lives of the battery modules are prolonged, and the safety performance is improved. And the battery management system judges the state of the battery module based on the SOC value of the battery module, and if the current battery module is in an unbalanced state, the battery management system determines the battery module with the SOC value smaller than a preset first threshold value as a target battery module and charges the battery module.
The battery management system is further configured to determine the target battery module from the at least one battery module based on a preset charging sequence in a case where it is determined that the at least one battery is in an equilibrium state based on an SOC value of the at least one battery module.
Here, the state in which the battery modules are in an equilibrium state is represented by the voltages of the respective battery modules being equal when the plurality of battery modules are connected in series. The battery management system judges the state of the battery modules based on the SOC value of the battery modules, and if the current battery modules are in a balanced state, the battery management system determines a target battery module from at least one battery module based on a preset charging sequence to charge the battery modules.
In some embodiments, the at least one battery module includes N, N being a natural number of 2 or more, and correspondingly, the switch controller includes N groups; the photovoltaic controller is connected with a corresponding group of battery modules through a group of switch controllers.
When N is equal to 2, the power battery pack includes two battery modules, as shown in fig. 2A, the switches S1 and S3 control the battery module 1, and the switches S2 and S4 control the battery module 2. Charging of the battery module 1 and/or the battery module 2 can be achieved by controlling the switches S1 to S4, including the following cases:
in case 1, when the switches S1 and S3 are closed and the other switches are opened, only the battery module 1 is in a connection state; in case 2, when the switches S2 and S4 are closed and the other switches are opened, only the battery module 2 is in the connected state. The voltages of the battery modules of cases 1 and 2 are both the first voltage. In case 3, when the switches S1 and S4 are closed and the other switches are opened, the battery module 1 and the battery module 2 are connected in series, and the voltage of the whole battery module after the series connection is the second voltage. The first voltage is low compared with the second voltage, the second voltage is high, and at this time, cases 1 and 2 are low voltage charging and module balancing; case 3 pertains to high voltage charging.
When N is equal to 3, the power battery pack includes three battery modules, as shown in fig. 2B, the switches S1 and S3 control the battery module 1, the switches S2 and S5 control the battery module 2, and the switches S4 and S6 control the battery module 3. The battery modules 1 to 3 can be charged by controlling the switches S1 to S6, and the battery modules 1 to 3 can be charged by any three battery modules, including the following cases:
in case 1, when the switches S1 and S3 are closed and the other switches are opened, only the battery module 1 is in a connection state; in case 2, when the switches S2 and S5 are closed and the other switches are opened, only the battery module 2 is in a connection state; in case 3, when the switches S4 and S6 are closed and the other switches are opened, only the battery module 3 is in the connected state. The voltages of the battery modules under the three conditions are all the first low voltage. In case 4, when the switches S1 and S6 are closed and the other switches are opened, the battery module 1, the battery module 2 and the battery module 3 are connected in series, and the voltage of the battery module after the series connection is the second voltage. At this time, cases 1 to 3 belong to low-voltage charging and module balancing; case 4 pertains to high voltage charging.
When N is equal to 4, the power battery pack includes four battery modules, as shown in fig. 2C, the switches S1 and S3 control the battery module 1, the switches S2 and S6 control the battery module 2, the switches S4 and S7 control the battery module 3, and the switches S5 and S8 control the battery module 4. The battery modules 1 to 4 can be charged by controlling the switches S1 to S8, and the charging of any one of the battery modules 1 to 4 is not more than four, including the following cases:
the respective controls of the battery modules 1 to 4 are similar to the case where the above-described power battery pack includes three battery modules, only in terms of differences in the names of the control switches, and are not described in detail herein, but four cases are included. In case 5, when the switches S1 and S8 are closed and the other switches are opened, the battery modules 1 to 4 are connected in series, and the voltage of the whole battery module after the series connection is the second voltage. At this time, cases 1 to 4 belong to low-voltage charging and module balancing; case 5 pertains to high voltage charging.
When N is equal to 5, the power battery pack includes five battery modules, as shown in fig. 2D, the switches S1 and S3 control the battery module 1, the switches S2 and S5 control the battery module 2, the switches S4 and S6 control the battery module 3, the switches S7 and S9 control the battery module 4, and the switches S8 and S10 control the battery module 5. The battery modules 1 to 4 can be charged by controlling the switches S1 to S10, and the charging of any not more than four battery modules can be realized, including the following cases:
the respective controls of the battery modules 1 to 5 are similar to the case where the above-described power battery pack includes three battery modules, only in that the differences in the names of the control switches are not described in detail herein, and five cases are included. For the application scene of high-voltage charging, four batteries are selected for series connection in order to match the voltage of the energy storage balance system. For example, when the switches S2 and S10 are closed and the other switches are opened, the battery modules 2 to 5 are connected in series, and the voltage of the battery module as a whole after the series connection is the second voltage. At this time, cases 1 to 5 belong to low-voltage charging and module balancing; the remaining four battery modules in series are charged at high voltage.
In some embodiments, the system further comprises a buffer battery pack having an output voltage lower than the output voltage of the power cell; the energy storage equalization system further comprises: and the vehicle-mounted photovoltaic system is used for converting solar energy into direct current.
Here, the photovoltaic system includes, but is not limited to, an onboard photovoltaic system onboard an automobile. The vehicle-mounted photovoltaic system converts solar energy into direct current and inputs the direct current into the power battery pack for energy storage. And continuously monitoring and acquiring battery information by the battery management system in the charging process, and determining a target battery module to be charged based on the acquired current battery information of the battery module. Then, the battery management system generates a control signal and sends the control signal to the switch controller, and after receiving the control signal sent by the battery management system, the switch controller enables the vehicle-mounted photovoltaic system to charge the target battery module to be charged by opening or closing the switch of the corresponding battery module, so that the charging of the power battery pack is completed.
In some embodiments, the energy storage equalization system further comprises:
and the switch controller is used for carrying out switch control on the first load and/or the second load and a charging circuit between the at least one battery module, the voltage of the first load is smaller than that of the second load, and the voltage of each battery module is matched with that of the first load.
Here, the first load includes, but is not limited to, a high/low voltage OBC, and the second load includes, but is not limited to, a high/low voltage load. The vehicle-mounted charger OBC is fixedly arranged on the automobile, has the capability of safely charging a power battery pack of the automobile, can dynamically adjust charging current or voltage parameters according to data provided by a battery management system, and executes corresponding actions to complete a charging process.
When N is equal to 3, the power battery pack includes three battery modules, as shown in fig. 3, the battery management system 31 sends a control signal to the switch controller 32, and the switch controller 32 may control the connection relationship between the high/low voltage OBC 33 and/or the high/low voltage load 34 and the battery modules #1 to 3 by controlling the on or off of the independent switches S1 to S6 corresponding to the battery modules #1 to 3, the high/low voltage OBC 33 and/or the high/low voltage load 34 of the power battery pack 35.
Under the condition that the power battery pack needs to store energy, the battery management system judges the current state of the power battery pack through battery information (such as SOC), and when the power battery pack is lower than a preset SOC threshold value, the battery management system determines a target battery module to be charged. And then, the battery management system generates a control signal according to the target battery module to be charged and sends the control signal to the switch controller, and the switch controller enables the target battery module to be charged to be connected with the high/low voltage OBC by opening or closing a switch of the corresponding battery module after receiving the control signal sent by the battery management system, so as to store energy for the power battery pack.
Under the condition that the power battery pack discharges outwards, the battery management system judges the current state of the power battery pack through battery information, and when the power battery pack is higher than an SOC threshold value set by Yu Yu, the battery management system generates a control signal and sends the control signal to the switch controller. After receiving the control signal sent by the battery management system, the switch controller selects at least one battery module to be connected in series by turning on or off the switch of the corresponding battery module, so that the battery modules connected in series are connected with the high/low voltage load, and the energy supply to the high/low voltage load is completed.
Based on the above embodiments, the embodiment of the present application further provides an energy storage equalization method for a new energy automobile. Fig. 4A is a schematic flow chart of an energy storage balancing method for a new energy automobile according to an embodiment of the present application, as shown in fig. 4A, the method at least includes the following steps:
step S401, detecting battery information of at least one battery module by a battery management system of an automobile in the process that a photovoltaic system stores energy for a power battery pack;
the photovoltaic system converts solar energy into direct current and outputs the direct current, and the power battery pack is stored by the linkage of the battery management system, the switch controller and the photovoltaic controller. Each battery module is independently connected with a battery management system, and the battery management system can detect and acquire battery information of each battery module. During the process of storing energy in the power battery pack, the battery management system may detect and obtain battery information of at least one battery module, where the battery information includes, but is not limited to, temperature, SOC, voltage, and the like.
Step S402, the battery management system determines a target battery module to be charged and a required charging voltage based on the battery information of the at least one battery module, and feeds back the target battery module and the required charging voltage to a photovoltaic controller; and controlling a switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module;
here, the battery management system determines a target battery module to be charged and a required charging voltage based on the acquired current battery information of the at least one battery module. There is a relation of connection between the battery management system and the photovoltaic controller, and the battery management system feeds back the target battery module to be charged and the required charging voltage to the photovoltaic controller. Meanwhile, a connection relationship exists between the battery management system and the switch controller, the battery management system determines a target battery module to be charged based on the acquired current battery information of the battery module, generates a control signal and sends the control signal to the switch controller, and the control signal is used for controlling the switch controller to close or open a charging circuit between the photovoltaic system and the target battery module.
In some embodiments, the battery information includes SOC of the battery, and the implementation of "determining the target battery module to be charged based on the battery information of the at least one battery module" in step S402 may include: the battery management system reads the SOC value of the at least one battery module in real time, and determines the battery module with the SOC value smaller than a preset first threshold value as the target battery module under the condition that the at least one battery is in an unbalanced state based on the SOC value of the at least one battery module.
Here, the battery state of charge SOC is used to reflect the remaining capacity of the battery, and is defined numerically as the ratio of the remaining capacity to the battery capacity, and is often expressed as a percentage. The value range is 0-1, and the battery is completely discharged when soc=0 and completely full when soc=1.
The battery modules are in unbalanced state, and the voltages of the battery modules are not equal when the battery modules are connected in series, so that the purpose of balancing is to ensure that the voltage states of the battery modules are kept consistent, and to prevent some battery modules in the power battery pack from being overcharged or overdischarged, so that the service life of the battery modules is prolonged, and the safety performance is improved. And the battery management system judges the state of the battery module based on the SOC value of the battery module, and if the current battery module is in an unbalanced state, the battery management system determines the battery module with the SOC value smaller than a preset first threshold value as a target battery module and charges the battery module.
In some embodiments, the battery information includes an SOC of the battery, and the implementation of "determining the target battery module to be charged based on the battery information of the at least one battery module" in step S402 may further include: the battery management system determines the target battery module from the at least one battery module based on a preset charge sequence if it is determined that the at least one battery is in an equilibrium state based on an SOC value of the at least one battery module.
Here, the state in which the battery modules are in an equilibrium state is represented by the voltages of the respective battery modules being equal when the plurality of battery modules are connected in series. The battery management system judges the state of the battery modules based on the SOC value of the battery modules, and if the current battery modules are in a balanced state, the battery management system determines a target battery module from at least one battery module based on a preset charging sequence to charge the battery modules.
In some embodiments, as shown in fig. 4B, the implementation of "feeding back the required charging voltage to the photovoltaic controller" in step S402 may include step S4021 and step S4022, wherein:
step S4021, determining the number of target battery modules to be charged;
here, the battery management system determines whether the battery modules need to be charged based on the battery information of the battery modules, and determines the number of target battery modules that need to be charged.
For example, if the battery management system detects that the soc=0 of the current battery module, it indicates that the battery is completely discharged, and the current battery module needs to be charged.
In step S4022, when the number is less than or equal to the preset threshold, the product of the required charging voltage of each battery module and the number is used as the required charging voltage, and the required charging voltage is fed back to the photovoltaic controller.
Illustratively, in the case where the power battery pack includes three battery modules, a typical value of the voltage of the battery modules is 12V, at which time the battery management system feeds back a 36V voltage to the photovoltaic controller.
Step S403, the photovoltaic controller stores energy for the target battery module based on the target battery module and the required charging voltage;
here, the photovoltaic controller is used for photovoltaic power control and stable power output, and the photovoltaic controller is connected with each battery module through the switch controller. In the process of storing energy of the power battery pack, the battery management system feeds back charging voltage required by the target battery module to be charged to the photovoltaic controller, and the photovoltaic controller outputs the charging voltage required by the target battery module to be charged after receiving the low-voltage direct-current power supply output by the photovoltaic system, so that the target battery module is charged, and the power battery pack is stored with energy.
Step S404, the switch controller performs switch control on the charging circuit between the photovoltaic system and the at least one battery module.
Here, each battery module has corresponding independent switch to control the connection state of the battery module, the battery management system determines the target battery module to be charged based on the obtained current battery information of the battery module, generates a control signal and sends the control signal to the switch controller, and after receiving the control signal sent by the battery management system, the switch controller changes the connection state of the battery module by opening or closing the switch of the corresponding battery module, so that the dynamic series-parallel combination of the battery modules is realized, different battery pack voltages are obtained, and the battery pack voltage control device is suitable for different application scenes.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence number of each step/process described above does not mean that the execution sequence of each step/process should be determined by its functions and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units; can be located in one place or distributed to a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
The foregoing is merely an embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application.

Claims (10)

1. An energy storage equalization system for a new energy vehicle, the system comprising:
the power battery pack provides a power battery for the new energy automobile and stores energy output by the photovoltaic system; the power battery pack comprises at least one battery module, and the voltage of each battery module is matched with the output voltage of the photovoltaic system;
the switch controller is used for carrying out switch control on the charging circuit between the photovoltaic system and the at least one battery module;
the battery management system is used for detecting battery information of the at least one battery module in the process that the photovoltaic system stores energy for the power battery pack, determining required charging voltage and a target battery module required to be charged based on the battery information of the at least one battery module, and feeding back the required charging voltage to the photovoltaic controller; and controlling the switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module to be charged;
and the photovoltaic controller is used for storing energy for the target battery module based on the charging voltage required by the target battery module.
2. The energy storage equalization system of claim 1, wherein the at least one battery module comprises N, N being a natural number greater than or equal to 2, and the switch controller comprises N groups, respectively; the photovoltaic controller is connected with a corresponding group of battery modules through a group of switch controllers.
3. The energy storage equalization system of claim 1, wherein the battery information comprises a SOC of a battery,
the battery management system is further configured to read an SOC value of the at least one battery module in real time, and determine, as the target battery module, a battery module having an SOC value smaller than a preset first threshold value when it is determined that the at least one battery is in an unbalanced state based on the SOC value of the at least one battery module.
4. The energy storage equalization system of claim 3, wherein the battery management system is further configured to determine the target battery module from the at least one battery module based on a preset charging sequence if it is determined that the at least one battery is in an equalized state based on an SOC value of the at least one battery module.
5. The energy storage equalization system of any of claims 2-4, further comprising a buffer battery, an output voltage of the buffer battery being lower than an output voltage of the power cell; the energy storage equalization system further comprises:
vehicle-mounted photovoltaic system: for converting solar energy into direct current.
6. The energy storage equalization system of any of claims 2-4, further comprising:
a switch controller for performing switch control on a charging circuit between the first load and/or the second load and the at least one battery module,
the voltage of the first load is smaller than that of the second load, and the voltage of each battery module is matched with that of the first load.
7. An energy storage equalization method for a new energy automobile is characterized by comprising the following steps:
the battery management system of the automobile detects battery information of at least one battery module in the process that the photovoltaic system stores energy for the power battery pack;
the battery management system determines a target battery module to be charged and a required charging voltage based on the battery information of the at least one battery module, and feeds back the target battery module and the required charging voltage to the photovoltaic controller; and controlling a switch controller to close a charging circuit between the photovoltaic system and the target battery module based on the target battery module;
the photovoltaic controller stores energy for the target battery module based on the target battery module and the required charging voltage;
and the switch controller is used for carrying out switch control on a charging circuit between the photovoltaic system and the at least one battery module.
8. The method of claim 7, wherein the battery information includes an SOC of a battery, and wherein the determining a target battery module to be charged based on the battery information of the at least one battery module includes:
the battery management system reads the SOC value of the at least one battery module in real time, and determines the battery module with the SOC value smaller than a preset first threshold value as the target battery module under the condition that the at least one battery is in an unbalanced state based on the SOC value of the at least one battery module.
9. The method of claim 8, wherein the determining a target battery module that needs to be charged based on battery information of the at least one battery module comprises:
the battery management system determines the target battery module from the at least one battery module based on a preset charge sequence if it is determined that the at least one battery is in an equilibrium state based on an SOC value of the at least one battery module.
10. The method of claim 7, wherein the feeding back the desired charging voltage to the photovoltaic controller comprises:
determining the number of target battery modules to be charged;
and under the condition that the number is smaller than or equal to a preset threshold value, taking the product of the required charging voltage of each battery module and the number as the required charging voltage, and feeding back the required charging voltage to the photovoltaic controller.
CN202311096321.1A 2023-08-25 2023-08-25 Energy storage system and method for new energy automobile Pending CN117124924A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311096321.1A CN117124924A (en) 2023-08-25 2023-08-25 Energy storage system and method for new energy automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311096321.1A CN117124924A (en) 2023-08-25 2023-08-25 Energy storage system and method for new energy automobile

Publications (1)

Publication Number Publication Date
CN117124924A true CN117124924A (en) 2023-11-28

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Family Applications (1)

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