CN112162201A - Detection system and method for battery module - Google Patents
Detection system and method for battery module Download PDFInfo
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- CN112162201A CN112162201A CN202011002040.1A CN202011002040A CN112162201A CN 112162201 A CN112162201 A CN 112162201A CN 202011002040 A CN202011002040 A CN 202011002040A CN 112162201 A CN112162201 A CN 112162201A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
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Abstract
The invention discloses a detection system and a detection method of a battery module. The method comprises the following steps: the system comprises a monitoring upper computer, a master control unit, at least one slave control unit and battery modules corresponding to the slave control units one by one; the monitoring upper computer is connected with the main control unit through a CAN protocol conversion cable; when the number of the slave control units is multiple, the master control unit is connected with the multiple slave control units in a cascading mode, and the master control unit is connected with the slave control units and the slave control units through isolation SPI communication buses; the slave control unit is connected with the battery module by adopting a switching wire harness; the monitoring upper computer is used for data display, parameter setting and data management; the master control unit is used for generating a detection signal according to the parameter setting of the monitoring upper computer and sending the detection signal to the at least one slave control unit; and the slave control unit is used for detecting the battery module according to the detection signal. The detection efficiency can be improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of battery detection, in particular to a system and a method for detecting a battery module.
Background
With the development of modern society, the related problems of energy crisis, environmental protection pressure and the like are increasingly aggravated, and the traditional fuel oil automobile has great influence on human life in the aspects of energy consumption and exhaust emission. The electric automobile serving as a special new energy automobile well solves a series of problems in the aspects of energy conservation and emission reduction, and becomes a future development trend of the automobile industry.
The power source of the electric automobile is a vehicle power battery pack, and a typical battery pack consists of a battery module, a battery management system, a high-voltage distribution box, a high-voltage wire harness, a cooling system and related mechanical structural components. The battery module is used as an aggregate of a group of battery core monomers and is the core part of the whole battery pack, and the quality of the module product has important influence on the overall performance of the battery pack.
Before the battery module is packaged, the battery module needs to be precisely detected and screened to judge whether the battery module has faults or abnormalities. To the module that possesses the package condition, need carry out voltage fine setting to partial difference electric core monomer to guarantee the product uniformity, need carry out data management in order to realize the product to trace back to each battery module simultaneously.
Disclosure of Invention
The embodiment of the invention provides a detection system and a detection method of a battery module, which are used for realizing the detection of the battery module and improving the detection efficiency.
In a first aspect, an embodiment of the present invention provides a detection system for a battery module, including: the system comprises a monitoring upper computer, a master control unit, at least one slave control unit and battery modules corresponding to the slave control units one by one;
the monitoring upper computer is connected with the main control unit through a CAN protocol conversion cable; when the number of the slave control units is multiple, the master control unit is connected with the multiple slave control units in a cascading mode, and the master control unit is connected with the slave control units and the slave control units through isolation SPI communication buses; the slave control unit is connected with the battery module by adopting a switching wire harness;
the monitoring upper computer is used for data display, parameter setting and data management; the master control unit is used for generating a detection signal according to the parameter setting of the monitoring upper computer and sending the detection signal to the at least one slave control unit; and the slave control unit is used for detecting the battery module according to the detection signal.
Further, the data display includes: the method comprises the following steps of displaying a test result, displaying monomer voltage information, module temperature information, module total pressure information, current parameter information, slave control unit state parameter information and fault information; the parameter setting includes: setting a system balance master control switch, setting balance parameters, setting a charge and discharge control switch and setting a fault judgment threshold; the data management includes: the method comprises the following steps of test report template management, stored data item management, local data storage management, cloud data storage management and test report management.
Further, the main control unit includes: the system comprises a microcontroller MCU, a power module, a CAN communication module, an isolation SPI communication module, an IO interface module, a charging control module, a discharging control module, a circuit fault detection module, a battery state estimation module and a test judgment module; the slave control unit includes: the device comprises a monomer voltage acquisition module, a temperature acquisition module, a slave control unit monitoring module, a balance maintenance module and a circuit fault detection module.
Further, the adoption isolation SPI communication bus between master control unit and the slave control unit links to each other includes: a first MIP pin of the main control unit is connected with a first SIP pin of the slave control unit, and a first MIM pin of the main control unit is connected with a first SIM pin of the slave control unit;
adopt isolation SPI communication bus to link to each other between slave control unit and the slave control unit includes: the second SIP pin of the current slave control unit is connected with the first SIP pin of the next slave control unit, and the second SIM pin of the current slave control unit is connected with the first SIM pin of the next slave control unit.
In a second aspect, an embodiment of the present invention further provides a method for detecting a battery module, where the method is performed by the system according to the embodiment of the present invention, and includes:
after the main control unit is powered on, initialization and self-checking are carried out, and whether a fault exists is judged;
if not, sending a wake-up instruction to the slave control unit;
the slave control unit configures parameters according to the awakening instruction;
the master control unit sends detection logic to the slave control unit, and the slave control unit carries out function detection on the battery module according to the detection logic.
Further, the parameter configuration includes: the method comprises the following steps of configuring voltage conversion channel parameters, configuring state bits, setting the type of a working frequency conversion mode, configuring single voltage under-voltage threshold values, setting the single voltage over-voltage threshold values and configuring equalization channel parameters.
Further, the function detection includes: a basic function detection, a first conditional function detection and a second conditional function detection;
the basic function detection comprises: detecting the voltage of the battery cell monomer, detecting a temperature sampling point, not detecting an equalizing circuit, and closing an equalizing channel; the first conditional function detects: the method comprises the following steps of detecting the state of a slave control unit chip and the open circuit state of a lead; the second conditional function detection comprises: the equalization circuit detects and opens the equalization channel.
Further, the detection logic comprises:
executing each function detection in the basic function detection in a circulating mode by a first set number;
performing one of the first conditional function tests at a time;
executing a first set number of function detections in the basic function detection in a circulating manner, and executing another function detection of the first conditional function detection once;
when the number of times of not performing the detection execution of the equalization circuit in the basic function reaches a second set number, performing the detection of the equalization circuit once in the next period;
when the detection of the equalization circuit is finished, judging whether the equalization channel starting condition is met, and if the equalization channel starting condition is met, starting the equalization channel once; until the detection stop condition is satisfied.
Further, the equalization channel turn-on condition includes: and receiving an equalizing channel opening instruction, wherein the result detected by the equalizing circuit is passed and the result judged by the equalizing judgment algorithm is opened.
Further, the implementation manner of starting the equalization channel is as follows:
for each slave control unit, judging whether an adjacent channel receives a balancing instruction;
if the balance instruction does not exist, starting a balance channel according to the balance instruction;
if the parity channels exist, the equalization channels are started by adopting the strategy of respectively equalizing the parity channels.
The embodiment of the invention discloses a detection system and a detection method of a battery module. The method comprises the following steps: the monitoring system comprises a monitoring upper computer, a master control unit, at least one slave control unit and battery modules corresponding to the slave control units one by one; the monitoring upper computer is connected with the main control unit through a CAN protocol conversion cable; when the number of the slave control units is multiple, the master control unit is connected with the multiple slave control units in a cascading mode, and the master control unit is connected with the slave control units and the slave control units through isolation SPI communication buses; the slave control unit is connected with the battery module by adopting a switching wire harness; the monitoring upper computer is used for data display, parameter setting and data management; the master control unit is used for generating a detection signal according to the parameter setting of the monitoring upper computer and sending the detection signal to at least one slave control unit; and the slave control unit is used for detecting the battery module according to the detection signal. The detection of the battery module can be realized, and the detection efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a detection system of a battery module according to a first embodiment of the invention;
fig. 2 is a flowchart of a method for detecting a battery module according to a second embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic structural diagram of a detection system for a battery module according to an embodiment of the present invention, which is applicable to a situation of detecting performance of the battery module, and as shown in fig. 1, the system includes: the monitoring system comprises a monitoring upper computer 110, a main control unit 120, at least one slave control unit 130 and battery modules 140 corresponding to the slave control units 130 one to one.
The monitoring upper computer 110 is connected with the main control unit 120 through a CAN protocol conversion cable; when the number of the slave control units 130 is multiple, the master control unit 120 is connected with the multiple slave control units 130 in a cascade connection manner, and the master control unit 120 is connected with the slave control units 130 and the slave control units 130 are connected with each other by isolated SPI communication buses; the slave control unit 130 is connected with the battery module 140 by a switching harness.
The monitoring upper computer 110 is used for data display, parameter setting and data management; the master control unit 120 is configured to generate a detection signal according to the parameter setting of the monitoring upper computer 110, and send the detection signal to the at least one slave control unit 130; the slave control unit 130 is used for detecting the battery module according to the detection signal.
The monitoring upper computer 110 can run on a PC and has a data display function, a parameter setting function, a data management function, and the like. The data display functions include: and the functions of displaying a test result, displaying monomer voltage information, module temperature information, module total pressure information, current parameter information, slave control unit state parameter information, displaying fault information and the like are realized. The parameter setting function includes: the system has the functions of setting a balanced master control switch, setting balanced parameters, setting a charge-discharge control switch, setting a fault judgment threshold value and the like. The data management functions include: the system comprises the functions of test report template management, stored data item management, local data storage management, cloud data storage management, test report management and the like.
The main control unit 120 includes: the device comprises a microcontroller MCU, a power module, a CAN communication module, an isolation SPI communication module, an IO interface module, a charging control module, a discharging control module, a circuit fault detection module, a battery state estimation module and a test judgment module.
The slave control unit 130 includes: the device comprises a monomer voltage acquisition module, a temperature acquisition module, a slave control unit monitoring module, a balance maintenance module and a circuit fault detection module.
In this embodiment, adopt between master control unit and the slave control unit to keep apart SPI communication bus and link to each other and include: the first MIP pin of the main control unit is connected with the first SIP pin of the slave control unit, and the first MIM pin of the main control unit is connected with the first SIM pin of the slave control unit. Adopt isolation SPI communication bus to link to each other between slave control unit and the slave control unit includes: the second SIP pin of the current slave control unit is connected with the first SIP pin of the next slave control unit, and the second SIM pin of the current slave control unit is connected with the first SIM pin of the next slave control unit. Specifically, the pin of the master unit MIP1 is connected with the pin of the SIP11 of the slave unit No. 1, and the pin of the master unit MIM1 is connected with the slave unit No. 1 SIM 11. The slave control units can be cascaded to realize expansion, the system design can expand at most 12 slave control units, and the specific connection relationship is as follows: the pin of the slave control unit SIP12 No. 1 is connected with the pin of the slave control unit SIP21 No. 2, the slave control unit SIM12 No. 1 is connected with the pin of the slave control unit SIM21 No. 2, and so on.
In this embodiment, switching pencil realizes being connected between slave unit and the battery module, including fixed interface and variable interface two parts, through realizing interconnect to the plug-in components, to the test demand of different battery modules, detects the demand with the adaptation through adjusting variable interface part.
The detection system of battery module that this embodiment provided includes: the monitoring system comprises a monitoring upper computer, a master control unit, at least one slave control unit and battery modules corresponding to the slave control units one by one; the monitoring upper computer is connected with the main control unit through a CAN protocol conversion cable; when the number of the slave control units is multiple, the master control unit is connected with the multiple slave control units in a cascading mode, and the master control unit is connected with the slave control units and the slave control units through isolation SPI communication buses; the slave control unit is connected with the battery module by adopting a switching wire harness; the monitoring upper computer is used for data display, parameter setting and data management; the master control unit is used for generating a detection signal according to the parameter setting of the monitoring upper computer and sending the detection signal to at least one slave control unit; and the slave control unit is used for detecting the battery module according to the detection signal. The detection of the battery module can be realized, and the detection efficiency is improved.
Example two
Fig. 2 is a flowchart of a method for detecting a battery module according to a second embodiment of the present invention, which is executed by the system for detecting a battery module according to the second embodiment of the present invention. As shown in fig. 2, the method comprises the steps of:
step 210, after the main control unit is powered on, initialization and self-checking are performed to determine whether a fault exists.
Specifically, after the main control unit is powered on, the circuit fault detection module performs self-detection on the main control unit, and if a fault exists, the circuit fault detection module prompts that the system is abnormal and powers off. If there is no failure, go to step 220.
Step 220, if not, a wake-up command is sent to the slave unit.
In this embodiment, the master control unit may send a wakeup instruction with a continuously set number of times to the slave control unit, so as to wake up the slave control unit and initialize parameter settings, and determine a working mode of the slave control unit.
And step 230, the slave control unit configures parameters according to the wake-up instruction.
Wherein, the parameter configuration comprises: the method comprises the steps of configuring GPIO voltage conversion channel parameters, configuring REFON state bits, setting the class of an ADCOPT working frequency conversion mode, configuring the voltage under-voltage threshold of a VUV monomer, setting the voltage over-voltage threshold of a VOV monomer and configuring DCC equalization channel parameters. And after the parameter configuration is completed, the slave control unit enters a period detection stage.
And 240, the master control unit sends detection logic to the slave control unit, and the slave control unit performs function detection on the battery module according to the detection logic.
Wherein, the function detection comprises: a base function test, a first conditional function test, and a second conditional function test. The basic function detection comprises the following steps: detecting the voltage of the battery cell monomer, detecting a temperature sampling point, not detecting an equalizing circuit, and closing an equalizing channel; the first conditional function detects: the method comprises the following steps of detecting the state of a slave control unit chip and the open circuit state of a lead; the second conditional function detection comprises: the equalization circuit detects and opens the equalization channel.
The detection of the equalization circuit and the detection of the non-equalization circuit can be mutually switched when certain conditions are met, and the switching of the equalization channel on and the switching of the equalization channel off can be mutually switched when certain conditions are met.
Wherein the detection logic may be: detecting each function in the basic function detection in a circulating execution mode by a first set number; performing one of the first conditional function tests at a time; executing a first set number of function tests in the loop execution basic function test, and executing another function test of the first condition function test once; when the number of times of not performing the detection execution of the equalization circuit in the basic function reaches a second set number, performing the detection of the equalization circuit once in the next period; when the detection of the equalization circuit is finished, judging whether the equalization channel starting condition is met, and if the equalization channel starting condition is met, starting the equalization channel once; until the detection stop condition is satisfied.
Wherein the first set number may be 100 and the second set number may be 500. The equalization channel turn-on conditions include: and receiving an equalizing channel opening instruction, wherein the result detected by the equalizing circuit is passed and the result judged by the equalizing judgment algorithm is opened.
Illustratively, the voltage detection of the cell monomers, the temperature sampling point detection, the detection without the equalizing circuit and the closing of the equalizing channel in the basic function detection are polled according to a set sequence, when the cycle number reaches 100 times, the state detection of the chip of the slave control unit is executed once, then the voltage detection of the cell monomers, the temperature sampling point detection, the detection without the equalizing circuit and the closing of the equalizing channel in the basic function detection are polled again for 100 times, the open-circuit state detection of a lead is executed once, and the detection of each function in the basic function detection is continuously polled. When the number of times of performing the detection without the equalizing circuit reaches 500 times, the detection by the equalizing circuit is performed once in the next cycle. That is, the equalizer circuit detection is performed once without performing the equalizer circuit detection every 500 times. After the detection function of the equalization circuit is executed, whether the equalization channel opening condition is met or not is judged, if not, the equalization channel is continuously closed, and if yes, the equalization channel is opened once.
In this embodiment, the implementation manner of starting the equalization channel is as follows: for each slave control unit, judging whether an adjacent channel receives a balancing instruction; if the balance instruction does not exist, starting a balance channel according to the balance instruction; if the parity channels exist, the equalization channels are started by adopting the strategy of respectively equalizing the parity channels.
In this embodiment, the cell unit voltage detection and the starting of the equalizing channel may be implemented in a function body F1. The function of starting the equalization channel needs to judge whether the equalization channel starting condition is met. The function body F1 is executed by the main control unit, and specifically, the implementation process of F1 is as follows: 1) sending an instruction to configure parameters of the slave control unit and closing all the cell balancing channels; 2) sending an instruction to reset a voltage register set; 3) sending an instruction to start the acquisition and conversion functions of all the cell monomer voltage acquisition channels; 4) the conversion is delayed for waiting, and the voltage measurement and conversion of the single battery cell are ensured to be completed; 5) sending an instruction to configure parameters of the slave control unit, and setting a cell equalization channel according to a judgment result of an equalization algorithm; 6) sending an instruction to read a conversion result of the voltage register group; 7) and carrying out comprehensive processing such as filtering, fault judgment, data unloading and the like on the voltage acquisition result of the single cell.
The temperature sampling point detection can be executed in the function body F2, in this function, the temperature collection is realized by NTC resistance and analog sampling circuit, and the software realizes the temperature collection function by looking up the conversion table of 'voltage-temperature'. The method is mainly applied to collecting the temperature state of the module and the temperature state of the circuit board. The specific implementation process can be described as follows: 1) sending an instruction to reset the auxiliary register set; 2) sending an instruction to start the acquisition and conversion functions of all the temperature acquisition channels; 3) the conversion is delayed for waiting, and the temperature acquisition, measurement and conversion are ensured to be completed; 4) sending an instruction to read a conversion result of the auxiliary register group; 5) and carrying out comprehensive processing such as filtering, fault judgment, data unloading, voltage-temperature conversion and the like on the temperature acquisition result.
The detection of the chip state of the slave control unit can be realized in a function body F3, and under the function, the master control unit voltage total voltage SOC, the slave control chip temperature ITMP, the slave control analog power supply VA, the slave control digital power supply VD, the overvoltage and undervoltage states of each channel, the multiplexer state and the chip temperature fault state are realized. The specific implementation process can be described as follows: 1) sending an instruction to reset a chip state register group; 2) sending an instruction to start the acquisition and conversion functions of all chip state acquisition channels; 3) the conversion is delayed for waiting, and the chip state acquisition measurement and conversion are ensured to be completed; 4) sending an instruction to read a conversion result of the auxiliary register group; 5) sending an instruction to start a multiplexer state detection function; 6) sending an instruction to read a monitoring result of the state of the multiplexer; 7) and comprehensively processing chip state data acquisition result fault judgment, functional state update and the like.
The detection of the open-circuit state of the lead can be realized by a function body F4, and under the group of functions, whether an open-circuit fault exists is judged according to a pressure difference range by respectively carrying out pull-up test and pull-down test on the acquisition loop. The specific implementation process can be described as follows: 1) sending an instruction to start pull-up test condition injection and simultaneously sending an instruction to reset a voltage register set; 2) sending an instruction to start the acquisition and conversion functions of all chip state acquisition channels, and waiting for conversion delay to ensure that the acquisition, measurement and conversion of the voltage of the single battery cell are completed; 3) sending an instruction to read a pull-up test conversion result of the voltage register group; 4) sending an instruction to start pull-down test condition injection and simultaneously sending an instruction to reset a voltage register group; 5) sending an instruction to start the acquisition and conversion functions of all chip state acquisition channels, and waiting for conversion delay to ensure that the acquisition, measurement and conversion of the voltage of the single battery cell are completed; 6) sending an instruction to read a pull-down test conversion result of the voltage register group; 7) and (4) implementing a wire open circuit algorithm, calculating the differential pressure of the pull-up parameter group and the pull-down parameter group, and comprehensively judging according to the set threshold condition. For the 1 st channel, if the pull-up conversion result is less than 10mV, the wire is determined to be an open circuit; for channels 2 to 11, if the difference between the pull-up conversion result and the pull-down conversion result is less than 300mV, the corresponding channel conductor is determined to be open-circuited, and the two adjacent channels have abnormal sampling data, so that the open-circuited state of the multiplexing conductor can be positioned; for channel 12, if the pull-down conversion result is less than 10mV, the wire is determined to be open.
The equalizer circuit detection may be implemented by the function F5, wherein the absence of the equalizer circuit detection may be understood as the cessation of the equalizer circuit detection and the sending of a bus wake-on-hold command. The specific implementation process of F5 may be: 1) sending an instruction to configure parameters of the slave control unit and closing all the cell balancing channels; 2) sending an instruction to reset a voltage register set; 3) sending an instruction and closing equalization switches of an (i) th channel and an (i +6) th channel of the cell monomer voltage acquisition at the same time, wherein i is 1,2,3,4,5 and 6; 4) sending an instruction, starting an acquisition and conversion function of an (i) th channel and an (i +6) th channel of the cell monomer voltage acquisition at the same time, and waiting for conversion delay, wherein i is 1,2,3,4,5 and 6; 5) sending an instruction to simultaneously disconnect equalizing switches of an (i) th channel and an (i +6) th channel of the cell unit voltage, wherein i is 1,2,3,4,5 and 6; 6) f5-3 to F5-5 are executed in a circulating mode until all the detection of the 6 groups of 12 channels is completed; 7) sending an instruction to read a detection test result of the voltage register group equalization circuit; 8) and executing an equalization circuit detection judgment algorithm, comparing the equalization circuit detection test result parameter group 1 with the single cell voltage acquisition result parameter group 2 acquired by the function of the basic sequence A in the previous period, judging whether the data in the parameter group 1 is in the range of 60-80% of the data in the parameter group 2, if so, judging that the related channel of the equalization circuit has no fault, otherwise, judging that the related channel of the equalization circuit has a fault, and forbidding the implementation of the passive equalization function of the F cell.
The detection system periodically calculates the data uploaded by the acquisition system, judges and compares the data according to the configuration parameters of the user of the upper computer, gives an evaluation result, simultaneously monitors the fault state of the system, positions the abnormal state module, and updates and reports the test parameter result and the fault detection result according to the content of the test template.
In this embodiment, the user can realize data management and report export for the offline module through the data management function of the upper computer. The template can be specified according to the requirements of corresponding projects through the test report template setting module, and option setting can be performed on product numbers, module information, shift information, personnel information and the like. The local storage configuration of the data specified by the user can be realized through the storage item setting module and the local storage module, the export of the module offline report is completed through the test report export module, and the work efficiency is improved in cooperation with product offline. Through high in the clouds storage module, can be with data storage to user-specified server to realize data management, data warehouse and product and trace back the function, promoted product maintenance work efficiency.
According to the technical scheme of the embodiment, after the main control unit is powered on, initialization and self-checking are carried out, and whether a fault exists is judged; if not, sending a wake-up instruction to the slave control unit; the slave control unit configures parameters according to the awakening instruction; the master control unit sends detection logic to the slave control unit, and the slave control unit carries out function detection on the battery module according to the detection logic. The detection of the battery module can be realized, and the detection efficiency is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A detection system of a battery module, comprising: the system comprises a monitoring upper computer, a master control unit, at least one slave control unit and battery modules corresponding to the slave control units one by one;
the monitoring upper computer is connected with the main control unit through a CAN protocol conversion cable; when the number of the slave control units is multiple, the master control unit is connected with the multiple slave control units in a cascading mode, and the master control unit is connected with the slave control units and the slave control units through isolation SPI communication buses; the slave control unit is connected with the battery module by adopting a switching wire harness;
the monitoring upper computer is used for data display, parameter setting and data management; the master control unit is used for generating a detection signal according to the parameter setting of the monitoring upper computer and sending the detection signal to the at least one slave control unit; and the slave control unit is used for detecting the battery module according to the detection signal.
2. The system of claim 1, wherein the data display comprises: the method comprises the following steps of displaying a test result, displaying monomer voltage information, module temperature information, module total pressure information, current parameter information, slave control unit state parameter information and fault information; the parameter setting includes: setting a system balance master control switch, setting balance parameters, setting a charge and discharge control switch and setting a fault judgment threshold; the data management includes: the method comprises the following steps of test report template management, stored data item management, local data storage management, cloud data storage management and test report management.
3. The system of claim 1, wherein the master control unit comprises: the system comprises a microcontroller MCU, a power module, a CAN communication module, an isolation SPI communication module, an IO interface module, a charging control module, a discharging control module, a circuit fault detection module, a battery state estimation module and a test judgment module; the slave control unit includes: the device comprises a monomer voltage acquisition module, a temperature acquisition module, a slave control unit monitoring module, a balance maintenance module and a circuit fault detection module.
4. The system of claim 1, wherein the master control unit is connected to the slave control unit by an isolated SPI communication bus comprising: a first MIP pin of the main control unit is connected with a first SIP pin of the slave control unit, and a first MIM pin of the main control unit is connected with a first SIM pin of the slave control unit;
adopt isolation SPI communication bus to link to each other between slave control unit and the slave control unit includes: the second SIP pin of the current slave control unit is connected with the first SIP pin of the next slave control unit, and the second SIM pin of the current slave control unit is connected with the first SIM pin of the next slave control unit.
5. A method for inspecting a battery module, the method being performed by the system of any one of claims 1-4, comprising:
after the main control unit is powered on, initialization and self-checking are carried out, and whether a fault exists is judged;
if not, sending a wake-up instruction to the slave control unit;
the slave control unit configures parameters according to the awakening instruction;
the master control unit sends detection logic to the slave control unit, and the slave control unit carries out function detection on the battery module according to the detection logic.
6. The method of claim 5, wherein the parameter configuration comprises: the method comprises the following steps of configuring voltage conversion channel parameters, configuring state bits, setting the type of a working frequency conversion mode, configuring single voltage under-voltage threshold values, setting the single voltage over-voltage threshold values and configuring equalization channel parameters.
7. The method of claim 5, wherein the function detection comprises: a basic function detection, a first conditional function detection and a second conditional function detection;
the basic function detection comprises: detecting the voltage of the battery cell monomer, detecting a temperature sampling point, not detecting an equalizing circuit, and closing an equalizing channel; the first conditional function detects: the method comprises the following steps of detecting the state of a slave control unit chip and the open circuit state of a lead; the second conditional function detection comprises: the equalization circuit detects and opens the equalization channel.
8. The method of claim 7, wherein the detection logic comprises:
executing each function detection in the basic function detection in a circulating mode by a first set number;
performing one of the first conditional function tests at a time;
executing a first set number of function detections in the basic function detection in a circulating manner, and executing another function detection of the first conditional function detection once;
when the number of times of not performing the detection execution of the equalization circuit in the basic function reaches a second set number, performing the detection of the equalization circuit once in the next period;
when the detection of the equalization circuit is finished, judging whether the equalization channel starting condition is met, and if the equalization channel starting condition is met, starting the equalization channel once; until the detection stop condition is satisfied.
9. The method of claim 8, wherein the equalization channel turn-on condition comprises: and receiving an equalizing channel opening instruction, wherein the result detected by the equalizing circuit is passed and the result judged by the equalizing judgment algorithm is opened.
10. The method of claim 7, wherein the equalizing channel is opened by:
for each slave control unit, judging whether an adjacent channel receives a balancing instruction;
if the balance instruction does not exist, starting a balance channel according to the balance instruction;
if the parity channels exist, the equalization channels are started by adopting the strategy of respectively equalizing the parity channels.
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