CN111697660A - Battery management system - Google Patents
Battery management system Download PDFInfo
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- CN111697660A CN111697660A CN202010588213.6A CN202010588213A CN111697660A CN 111697660 A CN111697660 A CN 111697660A CN 202010588213 A CN202010588213 A CN 202010588213A CN 111697660 A CN111697660 A CN 111697660A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
Abstract
The embodiment of the invention relates to a battery management system, which comprises a central processing unit, a detection module, a power supply control module, a system control module and a battery management unit: the central processing unit is respectively connected with the detection module, the power supply control module, the system control module and the at least one battery management unit; the detection module comprises a total voltage detection module, an insulation detection module and a total current detection module, and the total voltage detection module, the insulation detection module and the total current detection module are respectively and electrically connected with the central processing unit; the battery management unit is used for acquiring the state information of each single battery in the battery pack and carrying out the balance of the electric quantity in the battery pack on the single batteries in the battery pack according to the state information of the single batteries; the central processing unit is connected with each battery management unit through a CAN bus module; and the central processing unit acquires the total state information of each battery pack from the battery management unit through the CAN bus module, and performs inter-pack electric quantity equalization on the battery packs according to the total state information of the battery packs.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a battery management system.
Background
High-performance lithium ion batteries, which are a generic term for batteries using a lithium ion intercalation compound as a positive electrode material and whose charge and discharge processes are intercalation and deintercalation processes of lithium ions, have been rapidly developed in recent decades, and are accompanied by intercalation and deintercalation of electrons equivalent to lithium ions (conventionally, a positive electrode is represented by intercalation or deintercalation, and a negative electrode is represented by intercalation or deintercalation) during the intercalation and deintercalation processes of lithium ions, that is, lithium ions are intercalated or deintercalated and intercalated or deintercalated between the positive and negative electrodes. At present, lithium ion batteries are widely applied in the aspects of life and production. Lithium ion batteries are important components of electric vehicles, electric tools and electric bicycles, which are common in daily life, or in emerging technologies such as new energy power generation and smart power grids, and provide energy for systems or store redundant energy. In the field of high-power application, compared with other types of energy storage batteries, the lithium ion battery has some remarkable advantages, and has the characteristics of high energy density, high power density, long cycle life, environmental protection and the like, and compared with a nickel-hydrogen battery which can be used as a power battery, the single battery cell has higher voltage (about 3 times of the nickel-hydrogen battery), higher power density (about 2 times of the nickel-hydrogen battery), lower self-discharge rate (about half of the nickel-hydrogen battery), and no memory effect.
However, as a secondary battery of an electricity storage tool, a lithium ion battery is more severe in application environment, is most likely to be overcharged and overdischarged during use, and has poor thermal stability, poor consistency, a flat discharge voltage curve, and the like. For example, in an electric vehicle application, tens or even hundreds of batteries are typically required to be connected in series in order to achieve a higher battery voltage. After the batteries are grouped, the inconsistent conditions of parameters such as voltage, capacity and the like of the batteries are more serious than other applications due to the difference of battery materials, processes and later-stage use environments in the groups, if no measures are taken, the inconsistency is further expanded in the later-stage use process, so that part of the batteries work in a limit state for a long time, the capacity is sharply reduced, and the performance of the whole group of batteries is reduced. Therefore, a Battery Management System (BMS) is generally provided in an application of the lithium ion Battery to perform reasonable and effective Management and control on the Battery, thereby ensuring the safety of the Battery, prolonging the service life of the Battery, and providing the overall performance of the System. However, the battery management system in the prior art has some problems in both the processing electronics technology and the concept and strategy of battery management, which is not favorable for the development of lithium ion batteries.
Therefore, it is urgently required to design a battery management system capable of solving the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a battery management system adopting a two-stage BMS management scheme, which aims to solve the problems in the prior art, wherein a slave management battery pack management unit and a host control and management battery pack string can carry out real-time monitoring, charging and discharging, balancing, routing inspection, temperature detection and the like on single batteries and the whole battery pack, thereby realizing the management of multiple groups of batteries and detecting the voltage of all single batteries in each group, the total current of the battery pack, the multi-path environmental temperature and the like.
In order to achieve the above object, the present invention provides a battery management system for monitoring and evaluating a battery string and protecting a battery operating state of the battery string, wherein the battery string includes at least two groups of battery packs, and the battery management system includes a central processing unit, a detection module, a power control module, a system control module, and a battery management unit: the central processing unit is respectively connected with the detection module, the power supply control module, the system control module and at least one battery management unit;
the detection module comprises a total voltage detection module, an insulation detection module and a total current detection module;
the total voltage detection module is electrically connected with the central processing unit and is used for detecting the total voltage of the battery pack string, generating total voltage data and sending the total voltage data to the central processing unit;
the insulation detection module is electrically connected with the central processing unit and is used for detecting the insulation resistance of the battery pack string to the ground and the insulation resistance of the battery pack string to the ground, so that the insulation performance of the battery pack string is judged;
the total current detection module is electrically connected with the central processing unit and is used for detecting the total current of the battery pack string, generating total current data and sending the total current data to the central processing unit;
the battery management unit is used for acquiring the state information of each single battery in the battery pack and carrying out in-pack electric quantity equalization on the single batteries in the battery pack according to the state information of the single batteries;
the central processing unit is connected with each battery management unit through a CAN bus module; and the central processing unit acquires the total state information of each battery pack from the battery management unit through the CAN bus module, and performs inter-pack electric quantity equalization on the battery packs according to the total state information of the battery packs.
Preferably, the power control module comprises an alarm module, a hardware watchdog module and a power conversion module;
the alarm module is electrically connected with the central processing unit and is used for providing an indication function;
the hardware watchdog module is electrically connected with the central processing unit and used for monitoring and resetting the battery management system;
the power conversion module is electrically connected with the central processing unit and used for providing a power conversion function.
Preferably, the alarm module comprises an indicator light module and a buzzer module, and the indicator light module and the buzzer module are respectively electrically connected with the central processing unit; the indicator light module is used for light alarm, and the buzzer module is used for sound alarm.
Preferably, the system control module comprises a relay driving module, a real-time clock module and a total storage module;
the relay driving module is electrically connected with the central processing unit and is used for controlling the operation of the battery pack string through the opening and closing of the relay;
the real-time clock module is electrically connected with the central processing unit and is used for providing stable clock signals for the central processing unit;
the main storage module is electrically connected with the central processing unit and used for storing internal data of the central processing unit.
Preferably, the battery management system further comprises a data transmission module, wherein the data transmission module comprises an analog input module, an analog output module, a digital input module and a digital output module;
the analog input module is electrically connected with the central processing unit and is used for completing the input of analog quantity;
the analog output module is electrically connected with the central processing unit and is used for finishing the output of analog quantity;
the digital input module is electrically connected with the central processing unit and is used for completing the input of digital quantity;
the digital output module is electrically connected with the central processing unit and is used for finishing the output of digital quantity.
Preferably, the battery management system further comprises a serial data communication interface module and a charging CAN bus module.
Preferably, the detection module further includes a total temperature detection module, which is configured to detect the temperature of the battery string, generate total temperature data, and send the total temperature data to the central processing unit.
Preferably, the state information includes at least one of voltage data, current data, and temperature data.
Preferably, the battery management unit includes a sub-storage module for storing internal data of the battery management unit.
Preferably, the total voltage detection module, the insulation detection module and the total current detection module are electrically connected with the central processing unit through isolation circuits respectively.
The battery management system provided by the embodiment of the invention adopts a two-stage BMS management scheme, namely a master-slave machine scheme, a slave machine management battery pack management unit and a master machine control and management battery pack string, can carry out real-time monitoring, charging and discharging, balancing, routing inspection, temperature detection and the like on single batteries and the whole battery pack, can manage a plurality of groups of batteries by adopting intelligent technologies such as passive balancing control, over-temperature protection and the like, detects the voltage of all single batteries in each group, the total current of the battery pack, the multi-channel environmental temperature and the like, has multiple functions such as a communication function, an alarm protection function, a balancing function, a self-checking function, automatic calibration, event recording, electric control and the like, is powerful in function, complete in technical index, can effectively prolong the whole service life of a lithium ion battery, reduce the use cost of the.
Drawings
Fig. 1 is a block diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
The embodiment of the invention relates to a battery management system, which can monitor, charge and discharge, balance, patrol, detect temperature and the like of single batteries and the whole battery group in real time, can manage a plurality of groups of batteries, can detect the voltage of all single batteries in each group, the total current of a battery pack, the multi-channel environmental temperature and the like, has multiple functions of communication, alarm protection, balance, self-check, automatic calibration, event recording, charge and discharge control and the like, has powerful functions and complete technical indexes, can effectively prolong the service life of the whole lithium ion battery, and reduces the use cost of the lithium ion battery.
It is to be understood that the following specific examples are illustrative of the invention and are not to be construed as limiting the invention.
Fig. 1 is a block diagram of a battery management system according to an embodiment of the present invention. In conjunction with FIG. 1:
the battery management system provided by the embodiment of the invention comprises a central processing unit 1, a detection module 2, a power supply control module 3, a system control module 4, a battery management unit 5, a data transmission module 6, a serial data communication interface module 7, a charging CAN bus module 8, an isolation circuit 9 and a CAN bus module 10, wherein the central processing unit 1 is respectively connected with the detection module 2, the power supply control module 3, the system control module 4 and at least one battery management unit 5.
Specifically, the battery management system in the application is used for monitoring and evaluating the battery string and protecting the battery running state of the battery string, and mainly comprises the following functions: monitoring and transmitting the running state information of the lithium battery, the battery pack and the energy storage system unit, such as the voltage, the current, the temperature, the protection amount and the like of the battery; and evaluating and calculating the SOC (state of charge), the SOH (state of health), the accumulated processing energy of the battery, the safety of the battery and the like of the battery. Wherein, the battery group cluster includes at least two groups of battery groups.
The central processing unit 1 is a processing control unit of the host, and controls and manages the battery string.
The detection module 2 includes a total voltage detection module 21, an insulation detection module 22, and a total current detection module 23. In detail, the total voltage detection module 21 is electrically connected to the central processing unit 1, and is configured to detect the total voltage of the battery string, generate total voltage data, and send the total voltage data to the central processing unit 1, so that the central processing unit 1 obtains the total voltage data information of the battery string; the total current detection module 23 is electrically connected to the central processing unit 1, and is configured to detect the total current of the battery string, generate total current data, and send the total current data to the central processing unit 1, so that the central processing unit 1 obtains the total current data information of the battery string. Thus, the cpu 1 directly obtains the total voltage data information and the total current data information of the battery string through the total voltage detection module 21 and the total current detection module 23.
The high-voltage battery has electric energy, the insulation detection of the high-voltage battery belongs to the detection of a charged body, the electrical safety of a high-voltage battery system is directly related to the life of personnel, and the insulation failure can cause direct damage of high voltage to human bodies, so the detection of the insulation resistance is a crucial design link, the insulation detection module 22 is electrically connected with the central processing unit 1, and the insulation performance of the battery pack string is judged by detecting the insulation resistance of the battery pack string to the ground and the insulation resistance of the battery pack string to the ground.
Preferably, the total voltage detection module 21, the insulation detection module 22 and the total current detection module 23 are electrically connected to the central processing unit 1 through the isolation circuit 9, so as to isolate noise interference between the central processing unit 1 and the total voltage detection module 21, the insulation detection module 22 and the total current detection module 23.
In addition, the detection module 2 further includes a total temperature detection module (not shown in the figure) for detecting the temperature of the battery string, generating total temperature data and sending the total temperature data to the central processing unit 1, so that the central processing unit 1 obtains the total temperature data information of the battery string.
The detection module 2 is used for self-checking of the battery pack string, whether the self-checking analog quantity acquisition function is normal can be automatically detected through the total voltage detection module 21, the insulation detection module 22, the total current detection module 23 and the total temperature detection module, an instruction can be issued to the battery management unit 5 through the central processing unit 1, the battery management unit 5 is enabled to start the self-checking analog quantity acquisition function whether the self-checking analog quantity acquisition function is normal, and the collected self-checking result of the battery management unit 5 and the self-checking result of the self-checking module are locally stored or uploaded. In addition, the battery management unit 5 can also perform real-time self-checking, if a fault exists, the record can be checked by using a communication means, and meanwhile, the central processing unit 1 reports the self-checking information acquired by the detection module 2, so that the self-checking information of the battery management system can be recorded and inquired in real time.
The power control module 3 includes an alarm module 31, a hardware watchdog module 32 and a power conversion module 33. The alarm module 31 is electrically connected with the central processing unit 1 and is used for providing an indication function; the hardware watchdog module 32 is electrically connected with the central processing unit 1 and used for monitoring and resetting the battery management system, the hardware watchdog module 32 is provided with an input (a dog feeding end) and an output, when the central processing unit 1 of the battery management system normally works, a signal is output to the dog feeding end at intervals, a watchdog circuit is cleared to zero, if the dog is not fed for a specified time, and the hardware watchdog module 32 is timed out, a reset signal is returned to the central processing unit 1, so that the monitoring of the central processing unit 1 of the battery management system is reset, the central processing unit 1 is prevented from being halted, and the occurrence of program dead cycle or program runaway is avoided; the power conversion module 33 is electrically connected to the central processing unit 1 for providing a power conversion function.
Further, the alarm module 31 includes an indicator light module and a buzzer module, which are electrically connected to the central processing unit 1, respectively. The indicator light module is used for light alarm, and the buzzer module is used for sound alarm.
The battery management system provided by the embodiment of the invention can make different battery alarm protection parameters according to different environments, different battery manufacturers and different battery types. Different types of alarms and protection events are triggered according to different parameters set for the alarm module 31, wherein the main alarm types include: the battery pack string overvoltage warning, the battery pack string undervoltage warning, the battery pack string overcurrent warning, the single battery overvoltage warning, the single battery undervoltage warning, the single battery overcurrent warning, the single battery overtemperature warning and the single battery low-temperature warning are carried out, and the main protection types are as follows: the protection circuit comprises a battery pack string overvoltage protection device, a battery pack string undervoltage protection device, a battery pack string overcurrent protection device, a single battery overvoltage protection device, a single battery undervoltage protection device, a single battery overcurrent protection device, a single battery overtemperature protection device, a single battery low-temperature protection device and a short-circuit protection device.
The system control module 4 includes a relay drive module 41, a real time clock module 42, and a total storage module 43. The relay driving module 41 is electrically connected with the central processing unit 1 and is used for controlling the operation of the battery pack string through the opening and closing of a relay; the real-time clock module 42 is electrically connected with the central processing unit 1 and is used for providing a stable clock signal for the central processing unit 1; the total storage module 43 is electrically connected to the central processing unit 1 and is used for storing internal data of the central processing unit, so that the battery management system can store and read event records, parameters, historical data, communication abnormalities, system state abnormal events and the like of the whole battery pack string.
In the series battery pack, although the current passing through the single batteries is the same, the discharge depths of the batteries are different due to different capacities, so that the large capacity is always subjected to shallow charging and shallow discharging, and the small capacity is always subjected to overcharge and over discharging, which causes slow attenuation and long service life of the large capacity, and the small capacity is subjected to rapid attenuation and short service life, so that the difference between the large capacity and the small capacity is larger and larger. Therefore, it is necessary to reduce such differences through balancing to maintain the consistency of the batteries, so the battery management system provided by the embodiment of the present invention further includes a battery management unit 5 for performing intra-pack power balancing on the battery cells in the battery pack.
The battery management unit 5 is used for acquiring the state information of each battery monomer in the battery pack, and performing in-pack electric quantity equalization on the battery monomers in the battery pack according to the state information of the battery monomers, when the battery management unit 5 detects that the voltage difference of the battery monomers in the battery pack exceeds a certain value, the equalization is started, the passive equalization is performed, the voltage difference is balanced, namely the battery management unit 5 adopts the passive equalization, the charging current of the battery monomer with the highest voltage is limited through energy consumption, the charging balance of the battery monomers with lower voltage is realized, the control is simple, and the size is small. Preferably, the threshold value of the starting pressure difference for equalization in the battery management unit 5 can be set according to specific situations. Further, the battery management unit 5 includes a sub-storage module 51 for storing internal data of the battery management unit 5 so that the battery management system can store and read event records, parameters, history data, communication abnormalities, system state abnormality events, and the like of each group of battery packs.
In a particular implementation, the status information includes at least one of voltage data, current data, and temperature data.
The battery management system provided by the embodiment of the invention can be used for internal communication and can also be used for communication with an external background. In detail, the inside of the battery management system adopts CAN communication, and the outside adopts RS485 communication. In a specific embodiment, the central processing unit 1 is connected to each battery management unit 5 through the CAN bus module 10, and performs downward communication to collect battery string information, including information such as total voltage, total current, and total temperature of the battery string, and voltage, current, and temperature of individual batteries in the battery pack, so that the central processing unit 1 obtains total status information of each battery pack from the battery management units 5 through the CAN bus module 10, and performs inter-pack power equalization on the battery packs according to the total status information of the battery packs. The battery management system communicates upwards through the serial data communication interface module 7, and reports battery pack string information and battery pack information to an upper computer such as a display screen or an EMS (energy management system) and a background monitoring system.
In addition, the battery management system is also provided with a reserved charging CAN bus module 8 which is responsible for acquiring and detecting the voltage and the temperature of each single battery cell in real time and detecting the total voltage and the total current simultaneously in the charging process. When the voltage of any single cell in the battery system reaches a preset single cell voltage threshold value or the total voltage exceeds a preset total voltage threshold value, or the SOC reaches a preset charging set state, the battery management system cuts off the charging relay.
And the battery management system is powered on, the pre-charging relay is closed, and the system is in a pre-charging state. And after the pre-charging is finished, the pre-charging relay is switched off, the discharging relay is switched on, the system is in a normal discharging state, in the middle process, as long as the discharging relay of the system is switched off, the pre-charging is carried out before the next switching-on, and the pre-charging adopts a 2S time delay method. When the voltage discharge voltage of any single battery cell in the system is reduced to a preset single discharge voltage, the total voltage is lower than the preset total discharge voltage, or the SOC is reduced to a preset discharge set state, the battery management system cuts off the discharge relay.
In addition, the battery management system further comprises a data transmission module 6, and the data transmission module 6 comprises an analog input module, an analog output module, a digital input module and a digital output module. The analog input module is electrically connected with the central processing unit 1 and is used for completing the input of analog quantity; the analog output module is electrically connected with the central processing unit 1 and is used for finishing the output of analog quantity; the digital input module is electrically connected with the central processing unit 1 and is used for completing the input of digital quantity; the digital output module is electrically connected with the central processing unit 1 and is used for finishing the output of digital quantity.
Meanwhile, the battery management system can start an automatic calibration function through the central processing unit 1, when the SOC is larger than a preset value according to the electric quantity condition of the battery, the battery management system is calibrated by using a full-charging-emptying process, and the charging and discharging multiplying power is configured according to the type of the battery and environmental factors.
The battery management system provided by the embodiment of the invention adopts a two-stage BMS management scheme, namely a master-slave machine scheme, a slave machine management battery pack management unit and a master machine control and management battery pack string, can carry out real-time monitoring, charging and discharging, balancing, routing inspection, temperature detection and the like on single batteries and the whole battery pack, can manage a plurality of groups of batteries by adopting intelligent technologies such as passive balancing control, over-temperature protection and the like, detects the voltage of all single batteries in each group, the total current of the battery pack, the multi-channel environmental temperature and the like, has multiple functions such as a communication function, an alarm protection function, a balancing function, a self-checking function, automatic calibration, event recording, electric control and the like, is powerful in function, complete in technical index, can effectively prolong the whole service life of a lithium ion battery, reduce the use cost of the.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a battery management system for monitor, aassessment to the battery group cluster, and protect the battery running state of battery group cluster, the battery group cluster includes at least two sets of group battery, its characterized in that, battery management system includes central processing unit, detection module, power control module, system control module and battery management unit: the central processing unit is respectively connected with the detection module, the power supply control module, the system control module and at least one battery management unit;
the detection module comprises a total voltage detection module, an insulation detection module and a total current detection module;
the total voltage detection module is electrically connected with the central processing unit and is used for detecting the total voltage of the battery pack string, generating total voltage data and sending the total voltage data to the central processing unit;
the insulation detection module is electrically connected with the central processing unit and is used for detecting the insulation resistance of the battery pack string to the ground and the insulation resistance of the battery pack string to the ground, so that the insulation performance of the battery pack string is judged;
the total current detection module is electrically connected with the central processing unit and is used for detecting the total current of the battery pack string, generating total current data and sending the total current data to the central processing unit;
the battery management unit is used for acquiring the state information of each single battery in the battery pack and carrying out in-pack electric quantity equalization on the single batteries in the battery pack according to the state information of the single batteries;
the central processing unit is connected with each battery management unit through a CAN bus module; and the central processing unit acquires the total state information of each battery pack from the battery management unit through the CAN bus module, and performs inter-pack electric quantity equalization on the battery packs according to the total state information of the battery packs.
2. The battery management system of claim 1, wherein the power control module comprises an alarm module, a hardware watchdog module, and a power conversion module;
the alarm module is electrically connected with the central processing unit and is used for providing an indication function;
the hardware watchdog module is electrically connected with the central processing unit and used for monitoring and resetting the battery management system;
the power conversion module is electrically connected with the central processing unit and used for providing a power conversion function.
3. The battery management system according to claim 2, wherein the alarm module comprises an indicator light module and a buzzer module, and the indicator light module and the buzzer module are respectively electrically connected with the central processing unit; the indicator light module is used for light alarm, and the buzzer module is used for sound alarm.
4. The battery management system of claim 1, wherein the system control module comprises a relay driver module, a real time clock module, and a total storage module;
the relay driving module is electrically connected with the central processing unit and is used for controlling the operation of the battery pack string through the opening and closing of the relay;
the real-time clock module is electrically connected with the central processing unit and is used for providing stable clock signals for the central processing unit;
the main storage module is electrically connected with the central processing unit and used for storing internal data of the central processing unit.
5. The battery management system of claim 1, further comprising a data transmission module comprising an analog input module, an analog output module, a digital input module, and a digital output module;
the analog input module is electrically connected with the central processing unit and is used for completing the input of analog quantity;
the analog output module is electrically connected with the central processing unit and is used for finishing the output of analog quantity;
the digital input module is electrically connected with the central processing unit and is used for completing the input of digital quantity;
the digital output module is electrically connected with the central processing unit and is used for finishing the output of digital quantity.
6. The battery management system of claim 1, further comprising a serial data communication interface module and a charging CAN bus module.
7. The battery management system of claim 1, wherein the detection module further comprises a total temperature detection module for detecting the temperature of the battery string and generating total temperature data to be sent to the central processing unit.
8. The battery management system of claim 1, wherein the status information includes at least one of voltage data, current data, and temperature data.
9. The battery management system of claim 1, wherein the battery management unit comprises a separate storage module for storing internal data of the battery management unit.
10. The battery management system according to claim 1, wherein the total voltage detection module, the insulation detection module and the total current detection module are electrically connected to the cpu through isolation circuits.
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