CN110931899A - Fault diagnosis and failure processing system and method for lithium ion power battery pack - Google Patents
Fault diagnosis and failure processing system and method for lithium ion power battery pack Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention relates to the technical field of lithium ion power batteries of electric automobiles, and provides a fault diagnosis and failure processing system of a lithium ion power battery pack. The method for diagnosing the faults and processing the failures of the lithium-ion power battery pack comprises three steps S1-S3. The invention divides the faults of the power battery pack into three levels according to the severity, judges which level the faults belong to according to the value ranges of the collected signals of the voltage, the temperature and the like of the battery pack, and adopts different processing measures for different faults of each level, thereby realizing the failure processing of the power battery pack.
Description
Technical Field
The invention relates to the technical field of lithium ion power batteries of electric automobiles, in particular to a system and a method for fault diagnosis and failure processing of a lithium ion power battery pack.
Background
In recent years, lithium ion batteries have received much attention due to their characteristics of high energy density, long service life, and the like, and are applied to various fields such as mobile phones, energy storage, electric vehicles, and the like. However, as a class of energy storage devices involving complex chemical reactions, lithium ion batteries have high potential safety hazards, and in practical use, due to external environments, limitations of power technology development levels and other factors, faults such as overheating, overcharge, overdischarge and the like may occur.
Therefore, a system and a method for diagnosing and correspondingly processing faults are urgently needed.
Disclosure of Invention
The invention aims to provide a system and a method for diagnosing and processing failure of a lithium ion power battery pack.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions: a fault diagnosis and failure processing system of a lithium ion power battery pack comprises a voltage/temperature acquisition module, a bottom layer MCU, a total voltage measurement module and a main controller;
the voltage/temperature acquisition module is used for acquiring the monomer voltage and the monomer temperature of the lithium ion power battery;
the bottom MCU is used for collecting the information collected by the voltage/temperature collection module;
the total voltage measuring module is used for measuring the total voltage of the lithium ion power battery pack;
the main controller is used for pre-dividing the faults of the lithium ion power battery pack into three grades and giving each grade a one-to-one correspondence failure handling measure, receiving information fed back by the bottom layer MCU and information measured by the total voltage measuring module, analyzing, comparing an analysis result with the three grades to determine the grade of the faults, and then sending the determined result to the whole vehicle control system to make the failure handling measure corresponding to the grade of the faults.
The lithium ion power battery further comprises a balancing module, wherein the balancing module is used for changing the inconsistency of the single lithium ion power battery, preventing the battery from being overcharged and improving the overall performance of the battery; and the bottom layer MCU also collects the information collected by the balancing module and sends the information to the main controller.
Furthermore, the equalization module comprises an equalization circuit, the equalization circuit is formed by connecting a resistor in parallel at two ends of each single battery in the battery pack, and an analog switch is arranged in the loop.
Further, the voltage/temperature acquisition module comprises a single battery voltage acquisition circuit, when a certain path of voltage needs to be acquired, the bottom layer MCU selects voltages at two ends of a battery pack needing to be acquired through an I/O port, acquired voltage signals are introduced into the single battery voltage acquisition circuit through a differential amplifier circuit, and are directly sent into a built-in A/D module of the bottom layer MCU after being isolated, so that voltage data are acquired.
Further, the voltage/temperature acquisition module comprises a temperature acquisition circuit, the thermistor is placed in the battery pack, and the ambient temperature of the battery pack is obtained by measuring the resistance value of the thermistor in the temperature acquisition circuit.
The embodiment of the invention provides another technical scheme: a fault diagnosis and failure processing method for a lithium ion power battery pack comprises the following steps:
s1, dividing the faults of the lithium ion power battery pack into three grades in advance and giving one-to-one correspondence to each grade for failure treatment measures;
s2, collecting the monomer voltage and the monomer temperature of the lithium ion power battery, and measuring the total voltage of the lithium ion power battery pack;
and S3, analyzing according to the collected information and the measured information, comparing the analyzed result with the three grades to determine the grade of the fault, and further sending the determined result to the whole vehicle control system to take the failure treatment measures corresponding to the grade of the fault.
Further, in the step S1, cell voltage overvoltage thresholds V1, V2 and V3, cell voltage undervoltage thresholds V4 and V5, total voltage overvoltage thresholds U1, U2 and U3, total voltage undervoltage thresholds U4 and U5, and battery pack temperature thresholds C1 and C2 are preset.
Further, in the step S3, the comparison process specifically includes:
firstly, judging whether the vehicle is in a running state or not,
if the vehicle is not in a running state, judging whether the battery monomer is in overvoltage or not; if yes, judging the fault is a plurality of stages of faults and taking a failure treatment measure; if not, judging whether the single battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is under-voltage or not; if yes, judging the fault is a plurality of stages of faults and taking a failure treatment measure; if not, judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C2; if yes, judging the fault as a first-stage fault and prohibiting high-voltage power-on; if not, returning;
if the vehicle is in a running state, judging whether the battery monomer is in overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the single battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the battery is over-temperature; if yes, judging whether the battery temperature is greater than a battery pack temperature threshold value C1; if yes, judging the lithium battery to be a primary fault and disconnecting the relays at the positive end and the negative end of the lithium battery; and if not, judging that the motor is in a secondary fault and linearly limiting the output power of the motor to 0.
Further, when the vehicle is in a non-driving state, the method for judging the specific fault level and the corresponding failure treatment measures are as follows: judging whether the cell voltage V is greater than a cell voltage overvoltage threshold value V1, if so, judging that the cell voltage V is a primary fault, and forbidding high-voltage electrification; if not, judging whether the single voltage V is larger than a single voltage overvoltage threshold value V2, if so, judging that the single voltage V is a secondary fault, and stopping charging; if not, judging whether the cell voltage V is larger than a cell voltage overvoltage threshold value V3, if so, judging that the cell voltage V is a three-level fault, and reducing the charging current to 50%; judging whether the voltage V of the single body is smaller than the undervoltage threshold V4 of the single body, if so, judging that the single body is a primary fault, and forbidding high-voltage electrification; if not, judging whether the single voltage V is smaller than the single voltage threshold V5; if yes, judging the motor to be in a three-stage fault, and limiting the output power of the motor to be below 50%; judging whether the total voltage U of the battery is greater than a total voltage overvoltage threshold value U1, if so, judging that the battery is in a primary fault, and forbidding high-voltage electrification; if not, judging whether the total voltage U is greater than a total voltage overvoltage threshold value U2; if yes, judging the fault is a secondary fault, and stopping charging; if not, judging whether the total voltage U is greater than a total voltage overvoltage threshold value U3; if yes, judging the fault is a three-level fault, and reducing the charging current to 50%; judging whether the total voltage of the battery is smaller than a total voltage undervoltage threshold value U4 of the battery, if so, judging that the battery is a primary fault, and forbidding high-voltage electrification; if not, judging whether the total voltage of the battery is smaller than a total voltage undervoltage threshold value U5 of the battery, if so, judging that the battery is in a three-stage fault, and limiting the output power of the motor to be below 50%; if the total voltage of the battery is not undervoltage, judging whether the temperature of the battery is greater than a temperature threshold value C2 of the battery pack, if so, judging that the battery is in a primary fault, prohibiting high-voltage electrification, and if not, returning.
Further, when the vehicle is in a non-driving state, the method for judging the specific fault level and the corresponding failure treatment measures are as follows: judging whether the cell voltage V is greater than a cell voltage overvoltage threshold value V1, if so, judging a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the cell voltage V is larger than the cell voltage overvoltage threshold V3; if yes, judging the fault as a secondary fault, and forbidding feedback braking; judging whether the cell voltage V is smaller than a cell voltage undervoltage threshold value V4, if so, judging that the cell voltage V is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the single voltage V is smaller than the single voltage undervoltage threshold V5; if yes, judging the motor to be a secondary fault, and linearly limiting the output power of the motor to 0; judging whether the total voltage U of the battery is greater than a total voltage overvoltage threshold value U1, if so, judging the battery to be a primary fault, disconnecting relays at the positive end and the negative end of the lithium battery pack, if not, judging the battery to be a secondary fault, and forbidding feedback braking, otherwise, judging the battery to be a secondary fault, and judging the battery to be a secondary fault; judging whether the total voltage U of the battery is smaller than a total voltage undervoltage threshold value U4, if so, judging that the battery is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the total voltage U of the battery is smaller than the total voltage undervoltage threshold value U5; if yes, judging the motor to be a secondary fault, and linearly limiting the output power of the motor to 0; judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C1, if so, judging that the battery pack is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; and if not, judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C2, judging that the battery pack is in a three-stage fault, and limiting the output power of the motor to 0.
Compared with the prior art, the invention has the beneficial effects that: the faults of the power battery pack are divided into three levels according to the severity, the level to which the faults belong is judged according to the value ranges of the collected signals of the voltage, the temperature and the like of the power battery pack, and different processing measures are adopted for different faults of each level, so that the failure processing of the power battery pack is realized.
Drawings
Fig. 1 is a control block diagram of a fault diagnosis and failure processing system of a lithium ion power battery pack according to an embodiment of the present invention;
fig. 2 is a logic flow diagram of a method for diagnosing and processing failure of a lithium-ion power battery pack according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, an embodiment of the present invention provides a system for diagnosing and processing failure of a lithium ion power battery pack, including a voltage/temperature acquisition module, a bottom MCU, a total voltage measurement module, and a main controller; the voltage/temperature acquisition module is used for acquiring the monomer voltage and the monomer temperature of the lithium ion power battery; the bottom MCU is used for collecting the information collected by the voltage/temperature collection module; the total voltage measuring module is used for measuring the total voltage of the lithium ion power battery pack; the main controller is used for pre-dividing the faults of the lithium ion power battery pack into three grades and giving each grade a one-to-one correspondence failure handling measure, receiving information fed back by the bottom layer MCU and information measured by the total voltage measuring module, analyzing, comparing an analysis result with the three grades to determine the grade of the faults, and then sending the determined result to the whole vehicle control system to make the failure handling measure corresponding to the grade of the faults. In this embodiment, the failure of the power battery pack is classified into three levels according to the severity, which level the failure belongs to is determined according to the value ranges of the collected signals of the voltage, the temperature and the like of the battery pack, and different processing measures are adopted for different failures of each level, so that the failure processing of the power battery pack is realized.
As an optimization scheme of the embodiment of the present invention, please refer to fig. 1, the system further includes a balancing module, where the balancing module is configured to change the inconsistency of the single lithium-ion power battery, prevent the battery from being overcharged, and improve the overall performance of the battery; and the bottom layer MCU also collects the information collected by the balancing module and sends the information to the main controller. Preferably, the voltage/temperature acquisition module and the balancing module form one group and have multiple groups, the number of the groups is the same as that of the battery packs, and each battery pack comprises m lithium battery packs; the number of the bottom layer MCUs is also multiple, and the number of the bottom layer MCUs is also the same as that of the battery packs. As shown in fig. 1, the battery pack has n groups, each group of battery packs includes m lithium battery packs, one voltage/temperature acquisition module and the balancing module correspond to one battery pack, and one voltage/temperature acquisition module and the balancing module also correspond to one bottom MCU. The plurality of bottom layer MCUs all feed back information to the master controller through the CAN bus, and the master controller also sends the analyzed result to the whole vehicle control system through the CAN bus to act.
As an optimized scheme of the embodiment of the invention, the balancing module comprises a balancing circuit, the balancing circuit is formed by connecting a resistor in parallel at two ends of each single battery in the battery pack, and an analog switch is arranged in the loop. In the embodiment, the balancing principle is to reduce the voltage of the single batteries by discharging the resistors, so that the voltage between the single batteries in the battery pack can be controlled within a certain range.
As an optimization scheme of the embodiment of the invention, the voltage/temperature acquisition module comprises a single battery voltage acquisition circuit, when a certain path of voltage needs to be acquired, the bottom layer MCU selects the voltages at two ends of the battery pack needing to be acquired through an I/O port and a gating network, the acquired voltage signals are introduced into the single battery voltage acquisition circuit through a differential operational amplifier circuit, and are directly sent into a built-in A/D module of the bottom layer MCU after being isolated, so as to obtain voltage data. In this embodiment, the bottom MCU may collect the cell voltages inside the module by alternately gating the I/O ports.
As an optimized scheme of the embodiment of the invention, the voltage/temperature acquisition module comprises a temperature acquisition circuit, the thermistor is placed in the battery pack after simple processing, and the ambient temperature of the battery pack is obtained by measuring the resistance value of the thermistor in the temperature acquisition circuit. In this embodiment, for the ambient temperature of conveniently gathering the group battery, reduce the connecting wire between host system and the observing and controlling module, consider simultaneously that the observing and controlling module is closer to the group battery more, so with the temperature acquisition circuit setting in observing and controlling the unit, total way number sets up to 1 way, is used for detecting the group battery ambient temperature who observes and controls the unit control.
Referring to fig. 1 as an optimization scheme of the embodiment of the present invention, the system further includes a fault alarm module, configured to alarm in different situations according to faults of different levels. In this embodiment, the malfunction alerting module is provided with an indicator lamp and a buzzer to indicate different battery malfunctions. The indicator light adopts a light emitting diode system to divide the faults into three stages, namely general faults, serious faults and dangerous faults. When a general fault occurs, the fault indicator lamp blinks. When serious faults occur, the fault indicating lamp is always on. When dangerous faults occur, the fault indicating lamp is usually turned on and gives an alarm along with the buzzer. When no fault occurs, the fault indicator lamp is turned off.
Referring to fig. 1 as an optimized solution of the embodiment of the present invention, the system further includes a total current measuring module, a high voltage management module, and a charging and discharging module. In fig. 1, except that the equalization module carries a "module" word, each of the other modules is represented by an omitted expression, and the "module" is omitted. The total current measuring module is used for measuring the total current of the lithium ion power battery pack and can also be used as one of the bases for judging the fault level, and the other high-voltage management module and the charging and discharging module are also used.
Example two:
the present embodiment and the first embodiment described above are mutually cited.
Referring to fig. 2, an embodiment of the present invention provides a method for diagnosing and processing failure of a lithium ion power battery pack, including the following steps: s1, dividing the faults of the lithium ion power battery pack into three grades in advance and giving one-to-one correspondence to each grade for failure treatment measures; s2, collecting the monomer voltage and the monomer temperature of the lithium ion power battery, and measuring the total voltage of the lithium ion power battery pack; and S3, analyzing according to the collected information and the measured information, comparing the analyzed result with the three grades to determine the grade of the fault, and further sending the determined result to the whole vehicle control system to take the failure treatment measures corresponding to the grade of the fault.
Referring to fig. 2 as an optimized solution of the embodiment of the present invention, in the step S1, cell voltage overvoltage thresholds V1, V2 and V3, cell voltage undervoltage thresholds V4 and V5, total voltage overvoltage thresholds U1, U2 and U3, total voltage undervoltage thresholds U4 and U5, and battery pack temperature thresholds C1 and C2 are preset.
Further optimizing the above-mentioned scheme, referring to fig. 2, in the step S3, the comparison process specifically includes:
firstly, judging whether the vehicle is in a running state or not,
if the vehicle is not in a running state, judging whether the battery monomer is in overvoltage or not; if yes, judging the fault is a plurality of stages of faults and taking a failure treatment measure; if not, judging whether the single battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is under-voltage or not; if yes, judging the fault is a plurality of stages of faults and taking a failure treatment measure; if not, judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C2; if yes, judging the fault as a first-stage fault and prohibiting high-voltage power-on; if not, returning;
if the vehicle is in a running state, judging whether the battery monomer is in overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the single battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the battery is over-temperature; if yes, judging whether the battery temperature is greater than a battery pack temperature threshold value C1; if yes, judging the lithium battery to be a primary fault and disconnecting the relays at the positive end and the negative end of the lithium battery; and if not, judging that the motor is in a secondary fault and linearly limiting the output power of the motor to 0.
As an optimization scheme of the embodiment of the present invention, please refer to fig. 2, when the vehicle is in a non-driving state, the manner of determining the specific fault level and the corresponding failure handling measures are as follows: judging whether the cell voltage V is greater than a cell voltage overvoltage threshold value V1, if so, judging that the cell voltage V is a primary fault, and forbidding high-voltage electrification; if not, judging whether the single voltage V is larger than a single voltage overvoltage threshold value V2, if so, judging that the single voltage V is a secondary fault, and stopping charging; if not, judging whether the cell voltage V is larger than a cell voltage overvoltage threshold value V3, if so, judging that the cell voltage V is a three-level fault, and reducing the charging current to 50%; judging whether the voltage V of the single body is smaller than the undervoltage threshold V4 of the single body, if so, judging that the single body is a primary fault, and forbidding high-voltage electrification; if not, judging whether the single voltage V is smaller than the single voltage threshold V5; if yes, judging the motor to be in a three-stage fault, and limiting the output power of the motor to be below 50%; judging whether the total voltage U of the battery is greater than a total voltage overvoltage threshold value U1, if so, judging that the battery is in a primary fault, and forbidding high-voltage electrification; if not, judging whether the total voltage U is greater than a total voltage overvoltage threshold value U2; if yes, judging the fault is a secondary fault, and stopping charging; if not, judging whether the total voltage U is greater than a total voltage overvoltage threshold value U3; if yes, judging the fault is a three-level fault, and reducing the charging current to 50%; judging whether the total voltage of the battery is smaller than a total voltage undervoltage threshold value U4 of the battery, if so, judging that the battery is a primary fault, and forbidding high-voltage electrification; if not, judging whether the total voltage of the battery is smaller than a total voltage undervoltage threshold value U5 of the battery, if so, judging that the battery is in a three-stage fault, and limiting the output power of the motor to be below 50%; if the total voltage of the battery is not undervoltage, judging whether the temperature of the battery is greater than a temperature threshold value C2 of the battery pack, if so, judging that the battery is in a primary fault, prohibiting high-voltage electrification, and if not, returning.
As an optimization scheme of the embodiment of the present invention, please refer to fig. 2, when the vehicle is in a non-driving state, the manner of determining the specific fault level and the corresponding failure handling measures are as follows: judging whether the cell voltage V is greater than a cell voltage overvoltage threshold value V1, if so, judging a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the cell voltage V is larger than the cell voltage overvoltage threshold V3; if yes, judging the fault as a secondary fault, and forbidding feedback braking; judging whether the cell voltage V is smaller than a cell voltage undervoltage threshold value V4, if so, judging that the cell voltage V is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the single voltage V is smaller than the single voltage undervoltage threshold V5; if yes, judging the motor to be a secondary fault, and linearly limiting the output power of the motor to 0; judging whether the total voltage U of the battery is greater than a total voltage overvoltage threshold value U1, if so, judging the battery to be a primary fault, disconnecting relays at the positive end and the negative end of the lithium battery pack, if not, judging the battery to be a secondary fault, and forbidding feedback braking, otherwise, judging the battery to be a secondary fault, and judging the battery to be a secondary fault; judging whether the total voltage U of the battery is smaller than a total voltage undervoltage threshold value U4, if so, judging that the battery is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the total voltage U of the battery is smaller than the total voltage undervoltage threshold value U5; if yes, judging the motor to be a secondary fault, and linearly limiting the output power of the motor to 0; judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C1, if so, judging that the battery pack is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; and if not, judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C2, judging that the battery pack is in a three-stage fault, and limiting the output power of the motor to 0.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A fault diagnosis and failure processing system of a lithium ion power battery pack is characterized in that: the device comprises a voltage/temperature acquisition module, a bottom layer MCU, a total voltage measurement module and a main controller;
the voltage/temperature acquisition module is used for acquiring the monomer voltage and the monomer temperature of the lithium ion power battery;
the bottom MCU is used for collecting the information collected by the voltage/temperature collection module;
the total voltage measuring module is used for measuring the total voltage of the lithium ion power battery pack;
the main controller is used for pre-dividing the faults of the lithium ion power battery pack into three grades and giving each grade a one-to-one correspondence failure handling measure, receiving information fed back by the bottom layer MCU and information measured by the total voltage measuring module, analyzing, comparing an analysis result with the three grades to determine the grade of the faults, and then sending the determined result to the whole vehicle control system to make the failure handling measure corresponding to the grade of the faults.
2. The system for fault diagnosis and failure handling of a lithium ion power battery pack according to claim 1, wherein: the lithium ion power battery pack also comprises a balancing module, wherein the balancing module is used for changing the inconsistency of the single lithium ion power batteries, preventing the batteries from being overcharged and improving the overall performance of the batteries; and the bottom layer MCU also collects the information collected by the balancing module and sends the information to the main controller.
3. The system for diagnosing and processing the failure of the lithium-ion power battery pack according to claim 2, wherein: the balancing module comprises a balancing circuit, the balancing circuit is formed by connecting a resistor in parallel at two ends of each single battery in the battery pack, and an analog switch is arranged in the loop.
4. The system for fault diagnosis and failure handling of a lithium ion power battery pack according to claim 1, wherein: the voltage/temperature acquisition module comprises a single battery voltage acquisition circuit, when a certain path of voltage needs to be acquired, the bottom MCU selects voltages at two ends of a battery pack needing to be acquired through an I/O port, acquired voltage signals are introduced into the single battery voltage acquisition circuit through a differential operational amplifier circuit, and are directly sent into a built-in A/D module of the bottom MCU after being isolated, so that voltage data are acquired.
5. The system for fault diagnosis and failure handling of a lithium ion power battery pack according to claim 1, wherein: the voltage/temperature acquisition module comprises a temperature acquisition circuit, the thermistor is placed in the battery pack, and the ambient temperature of the battery pack is obtained by measuring the resistance value of the thermistor in the temperature acquisition circuit.
6. A fault diagnosis and failure processing method of a lithium ion power battery pack is characterized by comprising the following steps:
s1, dividing the faults of the lithium ion power battery pack into three grades in advance and giving one-to-one correspondence to each grade for failure treatment measures;
s2, collecting the monomer voltage and the monomer temperature of the lithium ion power battery, and measuring the total voltage of the lithium ion power battery pack;
and S3, analyzing according to the collected information and the measured information, comparing the analyzed result with the three grades to determine the grade of the fault, and further sending the determined result to the whole vehicle control system to take the failure treatment measures corresponding to the grade of the fault.
7. The method for diagnosing and processing the faults of the lithium-ion power battery pack as claimed in claim 6, wherein in the step S1, cell voltage overvoltage thresholds V1, V2 and V3, cell voltage undervoltage thresholds V4 and V5, total voltage overvoltage thresholds U1, U2 and U3, total voltage undervoltage thresholds U4 and U5, and battery pack temperature thresholds C1 and C2 are preset.
8. The method according to claim 7, wherein in the step S3, the comparison process specifically comprises:
firstly, judging whether the vehicle is in a running state or not,
if the vehicle is not in a running state, judging whether the battery monomer is in overvoltage or not; if yes, judging the fault is a plurality of stages of faults and taking a failure treatment measure; if not, judging whether the single battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is under-voltage or not; if yes, judging the fault is a plurality of stages of faults and taking a failure treatment measure; if not, judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C2; if yes, judging the fault as a first-stage fault and prohibiting high-voltage power-on; if not, returning;
if the vehicle is in a running state, judging whether the battery monomer is in overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the single battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is overvoltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the total voltage of the battery is under-voltage or not; if yes, judging the fault to be a plurality of levels of faults and adopting corresponding failure treatment measures; if not, judging whether the battery is over-temperature; if yes, judging whether the battery temperature is greater than a battery pack temperature threshold value C1; if yes, judging the lithium battery to be a primary fault and disconnecting the relays at the positive end and the negative end of the lithium battery; and if not, judging that the motor is in a secondary fault and linearly limiting the output power of the motor to 0.
9. The method for diagnosing and processing the failure of the lithium-ion power battery pack according to claim 8, wherein when the vehicle is in a non-driving state, the manner of judging the specific failure level and the corresponding failure processing measure are as follows: judging whether the cell voltage V is greater than a cell voltage overvoltage threshold value V1, if so, judging that the cell voltage V is a primary fault, and forbidding high-voltage electrification; if not, judging whether the single voltage V is larger than a single voltage overvoltage threshold value V2, if so, judging that the single voltage V is a secondary fault, and stopping charging; if not, judging whether the cell voltage V is larger than a cell voltage overvoltage threshold value V3, if so, judging that the cell voltage V is a three-level fault, and reducing the charging current to 50%; judging whether the voltage V of the single body is smaller than the undervoltage threshold V4 of the single body, if so, judging that the single body is a primary fault, and forbidding high-voltage electrification; if not, judging whether the single voltage V is smaller than the single voltage threshold V5; if yes, judging the motor to be in a three-stage fault, and limiting the output power of the motor to be below 50%; judging whether the total voltage U of the battery is greater than a total voltage overvoltage threshold value U1, if so, judging that the battery is in a primary fault, and forbidding high-voltage electrification; if not, judging whether the total voltage U is greater than a total voltage overvoltage threshold value U2; if yes, judging the fault is a secondary fault, and stopping charging; if not, judging whether the total voltage U is greater than a total voltage overvoltage threshold value U3; if yes, judging the fault is a three-level fault, and reducing the charging current to 50%; judging whether the total voltage of the battery is smaller than a total voltage undervoltage threshold value U4 of the battery, if so, judging that the battery is a primary fault, and forbidding high-voltage electrification; if not, judging whether the total voltage of the battery is smaller than a total voltage undervoltage threshold value U5 of the battery, if so, judging that the battery is in a three-stage fault, and limiting the output power of the motor to be below 50%; if the total voltage of the battery is not undervoltage, judging whether the temperature of the battery is greater than a temperature threshold value C2 of the battery pack, if so, judging that the battery is in a primary fault, prohibiting high-voltage electrification, and if not, returning.
10. The method for diagnosing and processing the failure of the lithium-ion power battery pack according to claim 8, wherein when the vehicle is in a non-driving state, the manner of judging the specific failure level and the corresponding failure processing measure are as follows: judging whether the cell voltage V is greater than a cell voltage overvoltage threshold value V1, if so, judging a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the cell voltage V is larger than the cell voltage overvoltage threshold V3; if yes, judging the fault as a secondary fault, and forbidding feedback braking; judging whether the cell voltage V is smaller than a cell voltage undervoltage threshold value V4, if so, judging that the cell voltage V is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the single voltage V is smaller than the single voltage undervoltage threshold V5; if yes, judging the motor to be a secondary fault, and linearly limiting the output power of the motor to 0; judging whether the total voltage U of the battery is greater than a total voltage overvoltage threshold value U1, if so, judging the battery to be a primary fault, disconnecting relays at the positive end and the negative end of the lithium battery pack, if not, judging the battery to be a secondary fault, and forbidding feedback braking, otherwise, judging the battery to be a secondary fault, and judging the battery to be a secondary fault; judging whether the total voltage U of the battery is smaller than a total voltage undervoltage threshold value U4, if so, judging that the battery is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; if not, judging whether the total voltage U of the battery is smaller than the total voltage undervoltage threshold value U5; if yes, judging the motor to be a secondary fault, and linearly limiting the output power of the motor to 0; judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C1, if so, judging that the battery pack is a primary fault, and disconnecting relays at the positive end and the negative end of the lithium battery pack; and if not, judging whether the temperature of the battery pack is greater than a battery pack temperature threshold value C2, judging that the battery pack is in a three-stage fault, and limiting the output power of the motor to 0.
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