CN109450059B - Distributed lithium battery control system and method - Google Patents

Distributed lithium battery control system and method Download PDF

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Publication number
CN109450059B
CN109450059B CN201910045269.4A CN201910045269A CN109450059B CN 109450059 B CN109450059 B CN 109450059B CN 201910045269 A CN201910045269 A CN 201910045269A CN 109450059 B CN109450059 B CN 109450059B
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voltage
module
control module
single battery
acquisition module
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CN109450059A (en
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李耀华
朱美露
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Shenzhen Goldwan Electronics Ltd
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Shenzhen Goldwan Electronics Ltd
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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
    • H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/16—Information or communication technologies improving the operation of electric vehicles

Abstract

The invention relates to the technical field of battery management and discloses a distributed lithium battery control system which comprises a hardware system consisting of a main control module, a total voltage acquisition module, a single battery voltage acquisition module, a high-voltage control module, a low-voltage control module, a total voltage sensor, a CPLD control module I, an optocoupler relay I, a sub-voltage sensor, a high-voltage balancing module, a low-voltage adaptation module, a CAN communication module I and a CAN communication module II; the main control module is in communication connection with the total voltage acquisition module and the single battery voltage acquisition module through the CAN communication module I, and is in communication connection with the high-voltage control module and the low-voltage control module through the CAN communication module II. The invention also discloses a control method of the distributed lithium battery control system. The invention solves the problem that the monitoring cost of the lithium battery control system cannot be effectively reduced while the working voltage of any single battery in the lithium battery module group is effectively monitored.

Description

Distributed lithium battery control system and method
Technical Field
The invention relates to the technical field of battery management, in particular to a distributed lithium battery control system and a distributed lithium battery control method.
Background
Because of its many good advantages, lithium batteries have been replacing traditional nickel-cadmium storage batteries and lead-acid storage batteries slowly, becoming the mainstream power batteries at present. In the lithium battery, because the chemical reaction is very complex, people continuously improve the self performance of the lithium battery, and simultaneously continuously research the management technology and the use of the lithium battery so as to prolong the service life of the lithium battery, improve the efficiency of the lithium battery and exert the performance of the lithium battery to the maximum extent.
At present, a lithium battery management system mainly has two architectures, namely a centralized architecture and a master-slave distributed architecture. The high-voltage processing unit and the data acquisition unit in the centralized battery management system are integrated on one circuit board, so that the battery management system has small data volume and simpler control strategy; the master-slave distributed battery management system is composed of a data acquisition unit and a master control unit, wherein the data acquisition unit is mainly responsible for data acquisition, the master control unit is responsible for data processing and high-voltage control, the master control unit and the high-voltage control unit of the framework are integrated together, more pin resources of a master control microcontroller are occupied, and therefore, the microcontroller controls modules such as a display screen and wireless communication modules, and the situation of insufficient resources can occur.
The invention patent application with application publication number CN107732341A discloses a distributed battery management system of a hybrid electric vehicle, which comprises a submodule voltage detection unit, a submodule temperature detection unit, a submodule equalization unit, a submodule control unit, a total module current detection unit, a total module control unit, a first total module CAN interface unit, a second total module CAN interface unit and a DC-DC conversion unit. The invention patent application can collect and process the state parameters of the lithium ion battery module, such as voltage, current, temperature and the like, in real time, and realize the real-time monitoring of the lithium ion battery module.
Although the invention patent application can realize the function of monitoring the battery module in real time, the management cost of the battery management system is greatly improved, and the service life of the battery management system is greatly shortened due to the high-intensity battery management work.
The invention provides a distributed lithium battery control system and a distributed lithium battery control method, and aims to solve the technical problem that the monitoring cost cannot be effectively reduced while the working voltage of any single battery in a lithium battery module group is effectively monitored by a lithium battery control system.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a distributed lithium battery control system and a distributed lithium battery control method, which solve the technical problem that the monitoring cost cannot be effectively reduced while the working voltage of any single battery in a lithium battery module group is effectively monitored by a lithium battery control system.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
the distributed lithium battery control system comprises a hardware system consisting of a main control module, a total voltage acquisition module, a single battery voltage acquisition module, a high-voltage control module, a low-voltage control module, a total voltage sensor, a CPLD control module I, an optocoupler relay I, a sub-voltage sensor, a high-voltage equalization module, a low-voltage adaptation module, a CAN communication module I and a CAN communication module II, and also comprises a software operating system and an application program which run on the hardware system;
the main control module is in communication connection with the total voltage acquisition module and the single battery voltage acquisition module through the CAN communication module I; the total voltage acquisition module is in communication connection with the total voltage sensor through a serial port master-slave communication mechanism;
the output port of the single battery voltage acquisition module is in communication connection with the input port of the first CPLD control module, the output port of the first CPLD control module is in communication connection with the input port of the first optocoupler relay, the output port of the first optocoupler relay is in communication connection with the input port of the sub-voltage sensor, the sub-voltage sensor is in intermittent connection with any single battery in the lithium battery pack in sequence, and the output port of the sub-voltage sensor is in communication connection with the input port of the single battery voltage acquisition module;
the main control module is in communication connection with the high-voltage control module and the low-voltage control module through the CAN communication module II, the output port of the high-voltage control module is in communication connection with the input port of the high-voltage balancing module, and the output port of the low-voltage control module is in communication connection with the input port of the low-voltage adapting module.
Preferably, the sub-voltage sensor is used for receiving an instruction of the optical coupling relay I, intermittently acquiring voltage data of the single battery and transmitting the acquired voltage data of any single battery to the single battery voltage acquisition module.
Furthermore, the control system comprises a current acquisition module and a current sensor, the current acquisition module is in communication connection with the main control module through the CAN communication module I, and the current acquisition module is in communication connection with the current sensor through a serial port master-slave communication mechanism.
Furthermore, the control system comprises a single battery temperature acquisition module, a CPLD control module II, a optocoupler relay II and a temperature sensor, wherein an output port of the single battery temperature acquisition module is in communication connection with an input port of the CPLD control module II, an output port of the CPLD control module II is in communication connection with an input port of the optocoupler relay II, an output port of the optocoupler relay II is in communication connection with an input port of the temperature sensor, and an output port of the temperature sensor is in communication connection with an input port of the single battery temperature acquisition module.
Furthermore, the temperature sensor is used for receiving an instruction of the optocoupler relay II, carrying out intermittent connection with any single battery in the lithium battery pack in sequence, intermittently acquiring temperature data of the single battery, and transmitting the acquired temperature data of any single battery to the single battery temperature acquisition module.
The control method of the distributed lithium battery control system comprises the following control steps:
s1, a main control module is sequentially communicated with a total voltage acquisition module, a current acquisition module, a single battery voltage acquisition module and a single battery temperature acquisition module through a CAN communication module I, and sends a data acquisition instruction to the acquisition module;
s2, the collecting module in the step S1 collects total voltage data of the lithium battery pack, current data of the lithium battery pack, voltage and temperature data of any single battery in the lithium battery pack respectively, and transmits the collected data to the main control module through the CAN communication module I;
s3, the main control module receives various parameter data acquired by the acquisition module, compares the parameter data with a standard working voltage and current value of a lithium battery pack and a standard working voltage and temperature value of a single battery which are built in the main control module, makes an analysis evaluation conclusion on the battery pack and the single battery according to a logic judgment program which is built in the main control module, and makes an execution command according to the analysis evaluation conclusion;
if the main control module makes an execution decision for controlling the high voltage, the main control module sends an instruction to the high voltage control module through the CAN communication module, the high voltage control module receives the instruction of the main control module, and the voltage of the single battery higher than the standard voltage value is reduced through the high voltage balancing module;
if the main control module makes an execution decision for controlling the low voltage, the main control module sends an instruction to the low voltage control module through the CAN communication module, the low voltage control module receives the instruction of the main control module, and the voltage of the single battery lower than the standard voltage value is increased through the low voltage adaptation module.
(III) advantageous effects
Compared with the prior art, the invention has the following beneficial technical effects:
1. the distributed lithium battery control system is characterized in that a single battery voltage acquisition module sends an instruction of intermittently acquiring voltage data of any single battery in the lithium battery pack to an optical coupling relay through a CPLD control module, the optical coupling relay enables a sub-voltage sensor to be sequentially and intermittently conducted with any single battery in the lithium battery pack, and the sub-voltage sensor sequentially and intermittently acquires voltage data of any single battery in the lithium battery pack, so that the technical effect of intermittently acquiring voltage data of any single battery in the lithium battery pack is realized;
the high-voltage control module is intermittently connected with the single batteries with the voltage values higher than the standard voltage value in the lithium battery pack through the high-voltage balancing module, so that the purpose of reducing the voltage of the single batteries with the voltage values higher than the standard voltage value is achieved, the low-voltage control module is intermittently connected with the single batteries with the voltage values lower than the standard voltage value in the lithium battery pack through the low-voltage adapting module, the purpose of improving the voltage of the single batteries with the voltage values lower than the standard voltage value is achieved, and therefore the technical effect of intermittently controlling the working voltage of any single battery in the lithium battery pack is achieved;
according to the technical scheme, the working voltage of any single battery in the lithium battery pack is monitored intermittently, so that the technical effect of effectively reducing the cost of monitoring the lithium battery is achieved while the working voltage of any single battery in the lithium battery pack is effectively monitored.
2. In the distributed lithium battery control system, the single battery temperature acquisition module sends an instruction of intermittently acquiring temperature data of any single battery in the lithium battery pack through the CPLD control module to the optocoupler relay, the optocoupler relay enables the temperature sensor to be sequentially switched on intermittently with any single battery in the lithium battery pack, and the temperature sensor intermittently acquires temperature data of any single battery in the lithium battery pack in turn, so that the technical effect of intermittently acquiring the working temperature of any single battery in the lithium battery pack is achieved.
3. According to the control method of the distributed lithium battery control system, any single battery voltage data in the lithium battery pack is intermittently acquired through the single battery voltage acquisition module and transmitted to the main control module, the main control module analyzes and evaluates the acquired single battery voltage data according to a built-in logic judgment program of the main control module, makes an execution command and sends the execution command to the high-voltage control module or/and the low-voltage control module, the high-voltage control module or/and the low-voltage control module intermittently controls the single battery in the lithium battery pack to be in a normal working state, the purpose of intermittently monitoring the working voltage of any single battery in the lithium battery pack is achieved, and therefore the technical effect of effectively reducing the cost of monitoring the lithium battery while effectively monitoring the working voltage of any single battery in the lithium battery pack is achieved.
Drawings
FIG. 1 is a logic block diagram of a distributed lithium battery control system of the present invention;
FIG. 2 is a logic block diagram of a cell voltage acquisition module according to the present invention;
FIG. 3 is a logic block diagram of a single battery temperature acquisition module according to the present invention;
fig. 4 is a logic block diagram of a control method of the distributed lithium battery control system according to the present invention.
Detailed Description
A distributed lithium battery control system, see fig. 1, including a hardware system composed of a main control module, a total voltage acquisition module, a current acquisition module, a single battery voltage acquisition module, a single battery temperature acquisition module, a total voltage sensor, a current sensor, a high voltage control module, a low voltage control module, a high voltage equalization module, a low voltage adaptation module, a CAN communication module i and a CAN communication module ii, and further including a software operating system and an application program running on the hardware system;
the main control module is mainly used for storing a standard working voltage value of the lithium battery pack, a standard working current value of the lithium battery pack, a standard working voltage value of a single battery and a standard working temperature value of the single battery, sending an instruction to the acquisition module, receiving various parameter data acquired by the acquisition module, analyzing, judging and processing the acquired parameter data according to a logic judgment program built in the acquisition module, and sending an execution instruction to the high-voltage control module or/and the low-voltage control module;
the main control module is in communication connection with the total voltage acquisition module, the current acquisition module, the single battery voltage acquisition module and the single battery temperature acquisition module through the CAN communication module I;
the master control module is mainly used for receiving an instruction of the master control module and sending the instruction to the master voltage sensor, the master voltage sensor is mainly used for acquiring the overall master voltage data of the lithium battery pack and transmitting the acquired master voltage data to the master voltage acquisition module, a CPU (central processing unit) of the master voltage acquisition module is communicated with the CPU of the master voltage sensor through a serial port master-slave communication mechanism, and the CPU of the master voltage acquisition module is a master processor and the CPU of the master voltage sensor is a slave processor;
the current acquisition module is mainly used for receiving an instruction of the master control module and sending the instruction to the current sensor, the current sensor is mainly used for acquiring current data of the lithium battery pack and transmitting the acquired current data to the current acquisition module, the CPU of the current sensor is communicated with the CPU of the current acquisition module through a serial port master-slave communication mechanism, and the CPU of the current acquisition module is a master processor and the CPU of the current sensor is a slave processor;
as shown in fig. 2, the single battery voltage acquisition module is mainly used for receiving an instruction of the main control module and sending an instruction to the first CPLD control module, the first CPLD control module is mainly used for receiving an instruction of the single battery voltage acquisition module and sending an instruction to the optical coupling relay, the first optical coupling relay is mainly used for receiving an instruction of the first CPLD control module and sending an instruction to the sub-voltage sensor, and the sub-voltage sensor is mainly used for receiving an instruction of the first optical coupling relay, intermittently connecting the instruction with any single battery in the lithium battery pack, intermittently acquiring voltage data of the single battery, and transmitting the acquired voltage data of any single battery to the single battery voltage acquisition module;
the output port of the single battery voltage acquisition module is in communication connection with the input port of the first CPLD control module, the output port of the first CPLD control module is in communication connection with the input port of the first optocoupler relay, the output port of the first optocoupler relay is in communication connection with the input port of the sub-voltage sensor, and the output port of the sub-voltage sensor is in communication connection with the input port of the single battery voltage acquisition module;
as shown in fig. 3, the single battery temperature acquisition module is mainly used for receiving an instruction of the main control module and sending an instruction to the second CPLD control module, the second CPLD control module is mainly used for receiving an instruction of the single battery temperature acquisition module and sending an instruction to the second optocoupler relay, the second optocoupler relay is mainly used for receiving an instruction of the second CPLD control module and sending an instruction to the temperature sensor, and the temperature sensor is mainly used for receiving an instruction of the second optocoupler relay, intermittently connecting the temperature sensor with any single battery in the lithium battery pack, intermittently acquiring temperature data of the single battery, and transmitting the acquired temperature data of any single battery to the single battery temperature acquisition module;
the output port of the single battery temperature acquisition module is in communication connection with the input port of the CPLD control module II, the output port of the CPLD control module II is in communication connection with the input port of the optocoupler relay II, the output port of the optocoupler relay II is in communication connection with the input port of the temperature sensor, and the output port of the temperature sensor is in communication connection with the input port of the single battery temperature acquisition module;
the main control module is in communication connection with the high-voltage control module and the low-voltage control module through a CAN communication module II;
the high-voltage control module is mainly used for receiving the instruction of the main control module and sending the instruction to the high-voltage balancing module, the high-voltage balancing module is mainly used for receiving the instruction of the high-voltage control module and is intermittently connected with the single battery with the voltage value higher than the standard voltage value in the lithium battery pack, and the input port of the high-voltage balancing module is in communication connection with the output port of the high-voltage control module;
the low-voltage control module is mainly used for receiving the instruction of the main control module and sending the instruction to the low-voltage adaptation module, the low-voltage adaptation module is mainly used for receiving the instruction of the low-voltage control module and is intermittently connected with the single battery with the voltage value lower than the standard voltage value in the lithium battery pack, and the input port of the low-voltage adaptation module is in communication connection with the output port of the low-voltage control module.
As shown in fig. 4, the control method of the distributed lithium battery control system includes the following control steps:
s1, the main control module is sequentially communicated with a total voltage acquisition module, a current acquisition module, a single battery voltage acquisition module and a single battery temperature acquisition module through a CAN communication module I, and sends a data acquisition instruction to the acquisition module
The main control module is communicated with the total voltage acquisition module through the CAN communication module I and sends a total voltage data acquisition instruction to the total voltage acquisition module;
the main control module is communicated with the current acquisition module through the CAN communication module I and sends a current data acquisition instruction to the current acquisition module;
the main control module is communicated with the single battery voltage acquisition module through the CAN communication module I, and sends a single battery voltage data acquisition instruction to the single battery voltage acquisition module;
the main control module is communicated with the single battery temperature acquisition module through the CAN communication module I, and sends a single battery temperature data acquisition instruction to the single battery temperature acquisition module;
s2, the collecting module in the step S1 collects total voltage data of the lithium battery pack, current data of the lithium battery pack and voltage and temperature data of any single battery in the lithium battery pack respectively, and transmits the collected data to the main control module through the CAN communication module I
The total voltage acquisition module sends a total voltage data request command to the total voltage sensor, the total voltage sensor acquires total voltage data of the lithium battery pack and sends the acquired total voltage data to the total voltage acquisition module through a serial port, and the total voltage acquisition module communicates with the main control module through the CAN communication module I and transmits the total voltage data to the main control module;
the current acquisition module sends a current data request command to the current sensor, the current sensor acquires current data of the lithium battery pack and sends the acquired current data to the current acquisition module through a serial port, and the current acquisition module communicates with the main control module through the CAN communication module I and transmits the current data to the main control module;
the single battery voltage acquisition module sends an instruction of intermittently acquiring the voltage of any single battery in the lithium battery pack to the optical coupling relay I through the CPLD control module, the optical coupling relay I enables the sub-voltage sensor to be sequentially and intermittently conducted with any single battery in the lithium battery pack, the sub-voltage sensor sequentially and intermittently acquires the voltage data of any single battery in the lithium battery pack and transmits the data to the single battery voltage acquisition module, and the single battery voltage acquisition module is communicated with the main control module through the CAN communication module I and transmits the data to the main control module;
the single battery temperature acquisition module sends an instruction of intermittently acquiring the temperature of any single battery in the lithium battery pack through a CPLD control module two-way optical coupling relay II, the optical coupling relay II enables a temperature sensor to be sequentially and intermittently conducted with any single battery in the lithium battery pack, the temperature sensor sequentially and intermittently acquires the temperature data of any single battery in the lithium battery pack and transmits the data to the single battery temperature acquisition module, and the single battery temperature acquisition module is communicated with the main control module through a CAN communication module I and transmits the data to the main control module;
s3, the main control module receives various parameter data acquired by the acquisition module, compares the parameter data with the standard working voltage and current value of the lithium battery pack and the standard working voltage and temperature value of the single battery built in the main control module, makes an analysis evaluation conclusion on the battery pack and the single battery according to a logic judgment program built in the main control module, and makes an execution command according to the analysis evaluation conclusion
The main control module receives the total voltage data of the lithium battery pack sent by the total voltage acquisition module, compares and analyzes the total voltage data with a standard working voltage value of the lithium battery pack built in the main control module, and makes an evaluation conclusion on the working total voltage condition of the lithium battery pack according to a built-in logic judgment program of the main control module;
the main control module receives the current data of the lithium battery pack sent by the current acquisition module, compares and analyzes the current data with the standard working current value of the lithium battery pack built in the main control module, and makes an evaluation conclusion on the working current condition of the lithium battery pack according to a logic judgment program built in the main control module;
the main control module receives the voltage data of the single batteries sent by the voltage acquisition module of the single batteries, compares and analyzes the voltage data of the single batteries with the standard working voltage value of the single batteries built in the main control module, and makes an evaluation conclusion on the working voltage condition of any single battery according to a logic judgment program built in the main control module;
the main control module receives the single battery temperature data sent by the single battery temperature acquisition module, compares and analyzes the single battery temperature data with a single battery standard working temperature value built in the main control module, and makes an evaluation conclusion on the working temperature condition of any single battery according to a built-in logic judgment program of the main control module;
the main control module carries out comprehensive analysis processing on the evaluation conclusion according to a logic judgment program arranged in the main control module, and makes an execution command:
if the main control module makes an execution decision for controlling the high voltage, the main control module sends an instruction to the high voltage control module through the CAN communication module, the high voltage control module receives the instruction of the main control module, and the voltage of the single battery higher than the standard voltage value is reduced through the high voltage balancing module;
if the main control module makes an execution decision for controlling the low voltage, the main control module sends an instruction to the low voltage control module through the CAN communication module, the low voltage control module receives the instruction of the main control module, and the voltage of the single battery lower than the standard voltage value is increased through the low voltage adaptation module.

Claims (2)

1. The utility model provides a distributed lithium battery control system which characterized in that: the system comprises a hardware system consisting of a main control module, a total voltage acquisition module, a single battery voltage acquisition module, a high-voltage control module, a low-voltage control module, a total voltage sensor, a CPLD control module I, an optocoupler relay I, a sub-voltage sensor, a high-voltage equalization module, a low-voltage adaptation module, a CAN communication module I and a CAN communication module II, and also comprises a software operating system and an application program which run on the hardware system; the main control module is in communication connection with the total voltage acquisition module and the single battery voltage acquisition module through the CAN communication module I; the total voltage acquisition module is in communication connection with the total voltage sensor through a serial port master-slave communication mechanism; the output port of the single battery voltage acquisition module is in communication connection with the input port of the first CPLD control module, the output port of the first CPLD control module is in communication connection with the input port of the first optocoupler relay, the output port of the first optocoupler relay is in communication connection with the input port of the sub-voltage sensor, the sub-voltage sensor is in intermittent connection with any single battery in the lithium battery pack in sequence, and the output port of the sub-voltage sensor is in communication connection with the input port of the single battery voltage acquisition module; the main control module is in communication connection with the high-voltage control module and the low-voltage control module through the CAN communication module II, the output port of the high-voltage control module is in communication connection with the input port of the high-voltage balancing module, and the output port of the low-voltage control module is in communication connection with the input port of the low-voltage adapting module; the sub-voltage sensor is used for receiving an instruction of the optical coupling relay I, intermittently acquiring voltage data of the single batteries and transmitting the acquired voltage data of any single battery to the single battery voltage acquisition module; the control system comprises a current acquisition module and a current sensor, wherein the current acquisition module is in communication connection with the main control module through a CAN communication module I, and the current acquisition module is in communication connection with the current sensor through a serial port master-slave communication mechanism; the control system comprises a single battery temperature acquisition module, a CPLD control module II, an optocoupler relay II and a temperature sensor, wherein an output port of the single battery temperature acquisition module is in communication connection with an input port of the CPLD control module II, an output port of the CPLD control module II is in communication connection with an input port of the optocoupler relay II, an output port of the optocoupler relay II is in communication connection with an input port of the temperature sensor, and an output port of the temperature sensor is in communication connection with an input port of the single battery temperature acquisition module; the temperature sensor is used for receiving an instruction of the optocoupler relay II, carrying out intermittent connection with any single battery in the lithium battery pack in sequence, intermittently acquiring temperature data of the single battery, and transmitting the acquired temperature data of any single battery to the single battery temperature acquisition module.
2. A control method of the distributed lithium battery control system according to claim 1, characterized in that: the method comprises the following control steps: s1, a main control module is sequentially communicated with a total voltage acquisition module, a current acquisition module, a single battery voltage acquisition module and a single battery temperature acquisition module through a CAN communication module I, and sends a data acquisition instruction to the acquisition module; s2, the collecting module in the step S1 collects total voltage data of the lithium battery pack, current data of the lithium battery pack, voltage and temperature data of any single battery in the lithium battery pack respectively, and transmits the collected data to the main control module through the CAN communication module I; s3, the main control module receives various parameter data acquired by the acquisition module, compares the parameter data with a standard working voltage and current value of a lithium battery pack and a standard working voltage and temperature value of a single battery which are built in the main control module, makes an analysis evaluation conclusion on the battery pack and the single battery according to a logic judgment program which is built in the main control module, and makes an execution command according to the analysis evaluation conclusion; if the main control module makes an execution decision for controlling the high voltage, the main control module sends an instruction to the high voltage control module through the CAN communication module, the high voltage control module receives the instruction of the main control module, and the voltage of the single battery higher than the standard voltage value is reduced through the high voltage balancing module; if the main control module makes an execution decision for controlling the low voltage, the main control module sends an instruction to the low voltage control module through the CAN communication module, the low voltage control module receives the instruction of the main control module, and the voltage of the single battery lower than the standard voltage value is increased through the low voltage adaptation module.
CN201910045269.4A 2019-01-17 2019-01-17 Distributed lithium battery control system and method Expired - Fee Related CN109450059B (en)

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