CN113567896B - Method, device and system for detecting faults of battery pack - Google Patents
Method, device and system for detecting faults of battery pack Download PDFInfo
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- CN113567896B CN113567896B CN202110802073.2A CN202110802073A CN113567896B CN 113567896 B CN113567896 B CN 113567896B CN 202110802073 A CN202110802073 A CN 202110802073A CN 113567896 B CN113567896 B CN 113567896B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000007599 discharging Methods 0.000 claims description 31
- 238000004891 communication Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 description 14
- 238000012545 processing Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000004590 computer program Methods 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000003672 processing method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/70—Testing of connections between components and printed circuit boards
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The method for detecting the wiring faults between the battery pack and the robot control circuit board according to the software mode can not cause excessive influence on the system, has low power consumption, reduces the detection cost, can process according to the detection result in time, prevents the battery pack from being put over, closes the system in time or closes a charging switch in time, and greatly prolongs the service life of the battery pack.
Description
Technical Field
The invention relates to the field of batteries, in particular to a fault detection method, device and system for a battery pack.
Background
In robot use, some robots consume a large amount of power, and a lithium battery with a large capacity needs to be selected. However, lithium batteries with large capacities also have relatively large volumes. In practical development and production of robots, larger lithium batteries can cause insufficient utilization rate of internal space of the robots, and the robots are large in appearance and do not meet the miniaturization and refinement standards of the robot design. At this time, a plurality of batteries are required to be connected in parallel for power supply, so that the space utilization rate of the robot is improved, and the cruising ability of the robot is increased.
However, when two or more batteries are supplied in parallel, some faults may occur in the batteries, for example, when the batteries are shipped in large quantities, a problem that wires are broken between a single battery in parallel and a robot control circuit board may occur due to a factory process problem. When a single battery in the multi-battery powered robot has a wire breakage problem, the electric quantity management system can be caused to judge wrongly. In the prior art, a method of hardware interface detection is adopted, and the hardware interface detection is generally carried out by sampling the battery voltage, so that the sampling part always works, the power consumption is very large, and the cost is high.
Therefore, it is desirable to provide a low-cost, low-power-consumption method for detecting a battery wiring fault.
Disclosure of Invention
The invention mainly solves the technical problem of providing a fault detection method, device and system for a battery pack, and the fault detection method for the battery pack can realize detection of battery wiring faults on the premise of low cost and low power consumption.
According to a first aspect, in one embodiment, there is provided a fault detection method of a battery pack, where the battery pack includes at least two batteries to be detected connected in parallel, the fault detection method includes:
determining a charge-discharge state of the battery pack, the charge-discharge state including a charge state or a discharge state;
acquiring battery information of each battery to be detected in the battery pack;
and determining wiring fault information by comparing battery information of each battery to be detected according to the charge and discharge states.
Optionally, obtaining the battery information of each battery to be detected in the battery pack includes:
the battery information of each battery to be detected is obtained through a communication protocol, and the battery information comprises: battery charge, battery charge current, battery discharge voltage, and battery charge voltage.
Optionally, determining the wiring fault information by comparing the battery information of each battery to be detected according to the charge and discharge states includes:
and when the charge and discharge states are charge states, comparing the charge current of each battery to be detected, and determining wiring fault information of the battery to be detected according to the charge current.
Optionally, determining the wiring fault information of the battery to be detected according to the charging current includes:
when the charging current of the battery to be detected is a first preset value and a preset condition is not met, determining that the wiring fault information of the battery to be detected is a charging wiring fault; wherein, the preset conditions include: the battery power of the battery to be detected is increased, the virtual power is full power, or the battery power of the battery to be detected is larger than the battery power of other batteries to be detected which are connected with the battery to be detected in parallel.
Optionally, determining the wiring fault information of the battery to be detected according to the charging current information, further includes:
and when the charging current of the battery to be detected is a first preset value and the time length of not meeting the preset condition is greater than a first time threshold, determining that the wiring fault information of the battery to be detected is a charging wiring fault.
Optionally, determining the wiring fault information by comparing the battery information of each battery to be detected according to the charge and discharge states, and further includes:
and when the charge and discharge states are discharge states, comparing the discharge current information of each battery to be detected, and determining the wiring fault information of the battery to be detected according to the discharge current information.
Optionally, determining the wiring fault information of the battery to be detected according to the discharging current includes:
and when the discharge current of the battery to be detected is a second preset value and the battery electric quantity of the battery to be detected is larger than the battery electric quantities of other batteries to be detected which are connected with the battery to be detected in parallel, determining that the wiring fault information of the battery to be detected is a discharge wiring fault.
Optionally, determining the wiring fault information of the battery to be detected according to the discharging current information, further includes:
and when the discharge current of the battery to be detected is a second preset value, and the duration that the voltage of the battery to be detected is greater than the voltage of other batteries to be detected connected in parallel with the battery to be detected is greater than a second time threshold, determining that the wiring fault information of the battery to be detected is a discharge wiring fault.
Optionally, after determining the wiring fault information in the battery pack, the method further includes:
and reporting the wiring fault information to an upper computer, and controlling a battery power management board to close a charging switch or a system.
According to a second aspect, in one embodiment, there is provided a fault detection device for a battery pack, the battery pack including at least two batteries to be detected connected in parallel, including:
the charging and discharging judging module is used for determining the charging and discharging state of the whole battery pack, wherein the charging and discharging state comprises a charging state or a discharging state;
the battery information acquisition module is used for acquiring battery information of each battery to be detected in the whole battery pack;
and the wiring fault judging module is used for determining wiring fault information by comparing the battery information of each battery to be detected according to the charge and discharge states.
According to a third aspect, there is provided in one embodiment a fault detection system for a battery pack, comprising:
a memory for storing a program;
and the processor is used for executing the program stored in the memory to realize any fault detection method.
According to the fault detection method, device and system for the battery pack, whether the battery pack has a wiring fault is determined according to the charge and discharge state and the battery information of each battery to be detected in the corresponding charge and discharge state, the fault of the battery charge and discharge interface line is detected and processed according to the software mode, the system is not influenced excessively, the power consumption is low, the detection cost is reduced, meanwhile, the battery pack can be processed timely according to the detection result, and the service life of the battery pack can be prolonged.
Drawings
FIG. 1 is a schematic diagram of a process flow for detecting a battery failure according to an embodiment of the present invention;
FIG. 2 is a flow chart of a battery fault detection process according to an embodiment of the present invention;
FIG. 3 is a flow chart of a portion of a battery fault detection process according to an embodiment of the present invention;
FIG. 4 is a flow chart of a portion of a battery fault detection process according to an embodiment of the present invention;
fig. 5 is a flow chart of a portion of a battery fault detection process according to an embodiment of the present invention.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
Battery power: SOC;
battery remaining capacity: SOH;
battery charging current: icharge;
battery discharge current: ioutput;
cell temperature: temperature;
battery discharge voltage: voutput;
battery charge voltage: vcharge.
As known from the background art, some faults may occur in the parallel power supply of more than two batteries, but in the prior art, the detection and processing method for the battery wiring faults has large power consumption and high cost.
In the embodiment of the invention, a method for detecting and processing faults of a battery charge-discharge interface line in a software mode is provided. The system is not excessively influenced in a software mode, the power consumption is low, the detection cost is reduced, meanwhile, the system can be timely processed according to the detection result, the situation that the battery is excessively discharged due to the battery wiring fault is avoided, and the service life of the battery pack is greatly prolonged.
It is known through analysis that when the battery pack is in a discharging state and has no fault, the battery with high voltage has to have a discharging current, and the battery with low voltage has to have no discharging current when the voltage difference is larger than a certain degree, but when the battery with high voltage discharges to a certain degree, the battery with low voltage has to have a discharging current when the voltage of the battery with low voltage is higher than that of other batteries.
When the battery pack is in a charged state as a whole and has no faults, the battery with low voltage and underfilled battery has charging current, and the battery with high voltage has no charging current when the voltage difference is larger than a certain degree. There may be no charging current after the battery is full.
According to the theory, the case where the battery pack has two batteries connected in parallel in the whole is described as follows: for example, the two batteries are battery B1 and battery B2, respectively, and the following fault conditions occur during parallel power supply of battery B1 and battery B2, so that detection is required:
first, a fault occurs in a discharge state, which includes:
battery B1 discharge wiring failure, battery B2 normal, and battery B2 discharge wiring failure, battery B1 normal.
When the discharge wiring of the battery B1 is failed and the battery B2 is normal: at this time, the discharging voltages of the battery B1 and the battery B2 may have two cases of the battery B1-Voutput > battery B2-Voutput or the battery B1-Voutput < = battery B2-Voutput.
(1) When batteries B1-Voutput > batteries B2-Voutput
Since the battery B1 and the battery B2 are in the parallel mode, theoretically the batteries B1-Ioutput >0 and the batteries B1-Ioutput > the batteries B2-Ioutput; therefore, in theory, as long as the battery B1-Ioutput < =0ma occurs, the battery B1 can be considered to have a discharge wiring failure. In the present embodiment, since the sampling accuracy of the battery current is considered to have an error of ±10ma, the sampling accuracy needs to be considered, and for example, as long as the battery B1-Ioutput < =15ma occurs, the discharge wiring of the battery B1 can be considered to be faulty. The fault may be handled, in this embodiment, when it is determined that the discharging connection fault occurs in the battery B1, the signal of the fault of the battery B1 is continuously uploaded to the upper computer until the line of the battery B1 is restored or the SOC of the battery B2 is reduced to 0, and at this time, the whole system is turned off to prevent the overdischarge of the battery B2.
(2) When battery B1-Voutput < = battery B2-Voutput
When the values of the batteries B2-Voutput-B1-Voutput are relatively large, the normal condition of the batteries B1-Ioutput may be 0, so that the wiring fault of which battery can not be determined at the moment, but the SOC of the battery B2 is enough at the moment to support the continuous operation of the machine until the fault can be judged according to the mode of (1) when the batteries B1-Voutput > the batteries B2-Voutput, and the processing is carried out.
When the discharge wiring of the battery B2 fails and the battery B1 is normal: at this time, the discharge voltages of the battery B1 and the battery B2 may be equal to the discharge voltages of the battery B1-Voutput > and the battery B2-Voutput, or the battery B1-Voutput < = battery B2-Voutput, so the battery B2 may be determined by the above-mentioned method for determining the battery B1.
Second, it is the state of charge that is a fault that occurs, including:
battery B1 charging wiring failure, battery B2 normal, and battery B2 charging wiring failure, battery B1 normal.
When the charging wiring of the battery B1 is failed, the battery B2 is normal: at this time, the charge voltages of the battery B1 and the battery B2 may have two cases where the battery B1-Vcharge < battery B2-Vcharge and the battery B1-Vcharge > =battery B2-Vcharge.
(1) When batteries B1-Vcharge < batteries B2-Vcharge
Since battery B1 and battery B2 are in parallel mode, the battery B1-Vcharge < battery B2-Vcharge correspondence should be theoretically: batteries B1-Icharge >0 and batteries B1-Icharge > batteries B2-Icharge; therefore, as long as the batteries B1-Icharge < = 0mA occur, the battery B1 can be considered to have a charging wiring failure. In this embodiment, considering that there is an error in the current sampling accuracy of the battery, for example, in this embodiment, when the current sampling accuracy error is ±10mA, for example, when the battery B1-Icharge < = 15mA occurs, the charging connection fault of the battery B1 may be considered, at this time, the fault may be handled, in this embodiment, when it is determined that the charging connection fault occurs in the battery B1, the control board closes the charging switch, and no battery is charged any more, and the upper computer continues uploading the fault. And until the charger is pulled out, automatically clearing the error.
(2) When battery B1-Vcharge > =battery B2-Vcharge
When the values of the batteries B1-Vcharge-B2-Vcharge are relatively large, the batteries B1-Icharge may be 0 in normal conditions, for example, if the battery B1 is full, the charging current may be 0, so that the charging connection fault of the battery B1 cannot be determined yet, and the battery can be used continuously. The use is made up to the case detection processing in the above (1) when the battery B1-Vcharge < battery B2-Voutpu is charged.
When the charging wiring of the battery B2 is failed, the battery B1 is normal: in this case, the charging voltage may be equal to the charging voltage of batteries B1 to Vcharge < batteries B2 to Vcharge > and batteries B1 to Vcharge > =batteries B2 to Vcharge, and therefore, battery B2 may be determined by the above-described method for determining battery B1.
According to the above analysis principle, the present embodiment provides a method for detecting a fault of a battery pack, and in combination with the detection method flowchart referring to fig. 1, the method includes:
and step 1, determining the charge and discharge states of the whole battery pack, wherein the charge and discharge states comprise a charge state or a discharge state.
In this embodiment, the battery pack may include at least two batteries, and each battery may be a battery to be detected, for example, the battery to be detected is a battery B1 and a battery B2. The battery pack may be in a discharge state or a charge state as a whole. Accordingly, the battery wiring fault may be a discharging wiring fault occurring in a discharging state or a charging wiring fault occurring in a charging state. For example, when the battery pack is in the discharge state as a whole, it may be determined whether the battery B1 or the battery B2 has a discharge wiring failure, and when the battery pack is in the charge state as a whole, it may be determined whether the battery B1 or the battery B2 has a charge wiring failure.
And 2, acquiring battery information of each battery in the whole battery pack.
In this embodiment, the battery information of each battery to be detected in the battery pack may be obtained through IIC (Inter-Integrated Circuit Bus, integrated circuit bus) communication protocol.
The battery information obtained by the IIC communication protocol comprises: battery charge SOC, battery remaining capacity SOH, battery charge current Icharge, battery discharge current Ioutput, battery Temperature, battery discharge voltage Voutput, and battery charge voltage Vcharge.
The order of steps 1 and 2 is not limited.
And step 3, determining the wiring fault information in the battery pack by comparing the battery information of each battery to be detected according to the charge and discharge states.
In this embodiment, determining the wiring fault information in the battery pack by comparing the battery information of each battery according to the charge and discharge states includes:
and when the charge and discharge states are charge states, comparing the charge current of each battery to be detected, and determining the wiring fault information of the battery to be detected according to the charge current.
Or,
and when the charge and discharge state is a discharge state, comparing the discharge current of each battery, and determining the wiring fault information in the battery pack according to the discharge current.
It is understood that the wiring fault information of the battery includes both cases of a charging wiring fault and a discharging wiring fault. For example, battery B1 may be a charging wiring failure or a discharging wiring failure; battery B2 may have a charge connection failure or a discharge connection failure.
In this embodiment, when detecting a charging connection fault, determining connection fault information of the battery to be detected according to the charging current includes: when the charging current of the battery to be detected is a first preset value and a preset condition is not met, determining that the battery to be detected has a wiring fault; wherein, the preset conditions include: and the electric quantity of the battery to be detected is increased, the virtual electric quantity is full electric quantity, or the voltage of the battery to be detected is larger than the voltage of other batteries to be detected.
It can be understood that the virtual power refers to the situation that the displayed power of the battery is very high and the actual power is relatively low, i.e. the displayed power of the battery is not the actual power of the battery. The virtual power being full power refers to a situation where the (virtual) power displayed by the battery is full power, and is not actually in a full power state.
It should be noted that, the other to-be-detected batteries refer to all other batteries except the battery being detected in the whole battery pack, for example, three batteries of the battery pack are the battery B1, the battery B2 and the battery B3, and the remaining batteries (the battery B2 and the battery B3) except the battery B1 are the other to-be-detected batteries when the battery B1 is being detected.
In this embodiment, the first preset value is a value that can determine that the battery to be detected has no charging current. For example, the battery B1 is the battery to be detected, and in theory, as long as a charging connection failure of the battery B1 occurs when the battery to be detected has no charging current, that is, in theory, when the charging current of the battery B1 < = 0mA, the charging connection failure of the battery B1 may be considered. However, in consideration of errors in the battery current sampling accuracy, for example, the current sampling accuracy error is ±15mA in the present embodiment, and therefore, in the present embodiment, the first preset value < =15 mA.
In this embodiment, determining the wiring fault information of the battery to be detected according to the charging current further includes:
setting a first time threshold;
and when the charging current of the battery to be detected is a first preset value and the time length of the battery to be detected which does not meet the preset condition is larger than the first time threshold, determining that the battery to be detected has a wiring fault.
It can be understood that when the charging current of the battery to be detected is a first preset value (when the battery to be detected has no charging current), whether the electric quantity of the battery to be detected is in an increased state is further determined, and if the electric quantity of the battery to be detected is in the increased state, the charging connection fault of the battery to be detected cannot be determined yet; it can further determine whether the virtual electric quantity of the battery to be detected is 100% of full electric quantity, if the virtual electric quantity is 100% of full electric quantity, it is not yet possible to determine the charging connection fault of the battery to be detected (refer to the analysis principle part, when the battery electric quantity is full, there is no charging current); it can be further determined whether the voltage of the battery to be detected is greater than the voltages of other batteries to be detected, and if the voltage of the battery to be detected is greater than the voltages of the other batteries to be detected, the battery charging connection fault cannot be determined. Therefore, if the charging current of the battery to be detected is the first preset value and is not the above condition, the battery to be detected can be temporarily determined to be a charging connection fault, and an alarm is given, or monitoring and observation are continued until such fault information continues for a certain time, for example, the duration is the first time threshold value, and then the charging connection fault of the battery to be detected is completely determined.
In this embodiment, the first time threshold may be 30 minutes, and it should be noted that the time and the fault count may be corresponding, and the first time threshold may also be a preset time threshold, for example, the fault count may be set to be greater than 10 times or 20 times, and then, the fault is completely determined to have a wiring fault, and then, a processing measure is taken.
In this embodiment, after determining that a certain battery has a charging connection fault in the charging connection fault, the battery power management control board turns off the charging switch, does not charge any battery any more, and continues to upload the fault to the host computer. And until the charger is pulled out, automatically clearing the error.
In this embodiment, in the discharging wiring fault, according to the charging and discharging states, and by comparing the battery information of each battery to be detected, wiring fault information is determined, and further including:
and when the charge and discharge state is a discharge state, comparing the discharge current of each battery, and determining the wiring fault information in the battery pack according to the discharge current.
In this embodiment, determining the wiring fault information in the battery pack according to the discharge current includes:
and when the discharge current of the battery to be detected is a second preset value and the voltage of the battery to be detected is larger than the voltage of other batteries to be detected, determining that the battery to be detected has a wiring fault. Because, when the battery is in a discharging state, the battery with high voltage must have a discharging current, if the voltage of the battery to be detected is higher than that of the other batteries, the discharging current of the battery to be detected should not be the second preset value. And when a battery to be detected is detected to be in a discharge wiring fault, alarming and prompting are carried out, and processing is carried out. And a detection frequency threshold value can be set, and when the discharge wiring fault count detected reaches the frequency threshold value, alarm prompt and processing are carried out.
In this embodiment, the second preset value is a value that can determine that the battery to be detected has no discharge current. For example, the battery B1 is the battery to be detected, and as long as a discharge wiring fault of the battery B1 occurs when the battery to be detected has no discharge current, that is, theoretically, when the discharge current of the battery B1 < =0ma, the discharge wiring fault of the battery B1 can be considered, but, considering that there is an error in the battery current sampling accuracy, for example, the current sampling accuracy error is ±15mA in the present embodiment, the second preset value < =15ma in the present embodiment.
In this embodiment, determining the wiring fault information in the battery pack according to the discharge current further includes:
setting a second time threshold;
and when the discharge current of the battery to be detected is a second preset value and the duration that the voltage of the battery to be detected is greater than the voltage of other batteries to be detected is greater than the second time threshold, determining that the battery to be detected has a wiring fault.
And when a certain battery to be detected is detected to be in a discharge wiring fault, alarming, or continuing to monitor and observe until the fault information continues for a certain time, for example, the duration is a second time threshold value, and then completely determining that the discharge wiring fault exists in the battery to be detected.
In this embodiment, the second time threshold may be 30 minutes, and it should be noted that the time and the fault count may be corresponding, and the first time threshold may also be a preset time threshold, for example, the fault count may be set to be greater than 10 times or 20 times, and then the fault is completely determined to have a wiring fault, and then a processing measure is taken.
The time threshold value in the detection process can be properly adjusted so as to improve the accuracy of the detection result.
In this embodiment, for example, after determining the wiring fault information in the battery B1, the battery power management control board may continuously upload the battery B1 fault to the host computer until the line of the battery B1 is restored or the SOC of the battery B2 is reduced to 0, and at this time, the entire system is turned off, thereby preventing the battery B2 from being overdischarged.
It can be understood that the upper computer refers to a computer capable of sending out a control command and is in signal connection with the battery power management control board.
Referring to fig. 2 in combination with fig. 3 to 5, based on the foregoing embodiments, a fault detection method and a processing flow example of a battery pack are provided in this embodiment, where the battery pack includes a battery a and a battery B in its entirety.
Step 101, determining whether the battery is in a charging state, if so, proceeding to step 102 (refer to a module D in fig. 3); if not, go to step 103 (refer to block E in FIG. 4).
The purpose of step 101 is to determine the charge and discharge state of the battery pack as a whole, and enter step 102 to be in a charge state and enter step 103 to be in a discharge state.
And acquiring battery information of each battery to be detected in the whole battery pack. In this embodiment, the battery information of each battery to be detected is obtained through an IIC communication protocol, where the battery information includes: power, remaining capacity, charge current, discharge current, temperature, discharge voltage, and charge voltage.
And then determining wiring fault information by comparing battery information of each battery to be detected according to the charge and discharge states, wherein the specific steps are as follows:
step 102, it is detected whether the charging current of the battery a is a first preset value, if yes, step 104 is entered, and if no, step 105 is entered.
The first preset value may be 0, and may also be an error value, for example, 15mA, in consideration of errors in battery current sampling accuracy.
The purpose of step 102 is to compare the charging current of each battery to be detected when the charging and discharging state is a charging state, and determine the wiring fault information of the battery to be detected according to the charging current.
Step 104, it is detected whether the electric quantity of the battery a is in an increased state, or whether the virtual electric quantity of the battery a is in a state of being full of 100%, or whether the voltage of the battery a is greater than the voltage of the battery B. If yes, go to step 106, if no, go to step 107.
Step 105, the battery a charging interface failure count is cleared.
And 106, clearing the fault count of the charging interface of the battery A.
Step 107, battery a charging interface failure begins counting.
Whether or not the battery a detects a fault and performs fault counting, the process proceeds to step 108, starts to detect the battery B, detects whether or not the charging current of the battery B is 0, if yes, proceeds to step 109, and if no, proceeds to step 110.
The detection of battery B is the same as the detection of battery a, as follows:
in step 109, it is detected whether the charge of the battery B is in an increased state, or whether the virtual charge of the battery B is in a 100% full state, or whether the voltage of the battery B is greater than the voltage of the battery a. If yes, go to step 111, if no, go to step 112.
Step 110, the battery B charging interface failure count is cleared.
And step 111, clearing the fault count of the charging interface of the battery B.
At step 112, battery B charging interface failure begins counting.
Whether a fault is detected or counted in the battery A, B, step 113 is entered.
Step 103, determining whether the discharge current of the battery B is a second preset value, if yes, proceeding to step 201, otherwise proceeding to step 202.
In this embodiment, the second preset value is 0, and may also be an error value, for example, 15mA, in consideration of errors in the battery current sampling accuracy.
The purpose of step 103 is to compare the discharge current information of each battery to be detected when the charge and discharge state is a discharge state, and determine the wiring fault information of the battery to be detected according to the discharge current information.
Step 201, it is determined whether the voltage of battery a is greater than or equal to the voltage of battery B. If yes, go to step 203, if no, go to step 204.
In this embodiment, considering the voltage sampling accuracy problem, for example, the accuracy error is ±600mV, it is determined whether the voltage of battery a is greater than or equal to +600mV of the voltage of battery B, if yes, step 203 is entered, and if no, step 204 is entered.
Step 202, clearing the failure count of the discharging interface of the battery A.
Step 203, battery a discharge interface failure count.
Step 204, the battery a discharge interface failure count is cleared.
Whether or not battery a detects a fault and counts the faults, the process proceeds to step 205, and starts to detect battery B, and detects whether or not the discharge current of battery B is 0, if yes, the process proceeds to step 206, and if no, the process proceeds to step 207.
The detection procedure for battery B is the same as for battery a, as follows:
step 206, determining whether the voltage of battery B is greater than or equal to the voltage of battery a. If yes, go to step 208, if no, go to step 209.
In this embodiment, considering the voltage sampling accuracy problem, for example, the accuracy error is ±600mV, it is determined whether the voltage of battery B is greater than or equal to +600mV of the voltage of battery a, if yes, step 208 is entered, and if no, step 209 is entered.
Step 208, battery B discharge interface failure count.
Step 209, clearing the battery B discharge interface failure count.
Step 207, the battery B discharge interface failure count is cleared.
Whether a fault is detected or counted in battery a or B, step 113 (see block F in fig. 5) is entered.
Step 113, determining whether the battery a charging interface count time is greater than a first time threshold, if so, proceeding to step 114, otherwise proceeding to step 115.
In this embodiment, the first time threshold is set to 30 minutes.
Step 114, determining that the battery a charging interface is malfunctioning and proceeding to the next step 115.
Step 115, proceed to the next step 116.
Step 116, determining whether the battery B charging interface failure count time is greater than a first time threshold. If yes, go to step 117, if no, go to step 118.
Step 117, determine battery B charging interface failure and proceed to the next step 118.
Step 118, proceed to the next step 119.
Step 119 determines whether the discharge interface failure count time for battery a is greater than a second time threshold. If yes, go to step 120, if no, go to step 121.
In this embodiment, the second time threshold is 10s.
Step 120, battery a is determined to be a discharge interface failure and proceeds to the next step 121.
Step 121, proceed to the next step 122.
Step 122 determines whether the discharge interface failure count time of battery B is greater than a second time threshold. If yes, go to step 123, if no, go to step 124.
Step 123, battery B is determined to be a discharge interface failure, and proceeds to the next step 124.
Step 124, proceed to the next step 125.
Step 125, returning to step 101, determining the charge and discharge state of the whole battery pack, and continuing the cycle.
The interface fault in this embodiment has the same meaning as the wiring fault in the above description.
The embodiment also provides a battery fault detection device, which comprises a charge and discharge judgment module, a battery information acquisition module and a wiring fault judgment module.
The charge and discharge judging module is used for determining the charge and discharge state of the whole battery pack, wherein the charge and discharge state comprises a charge state or a discharge state.
The battery information acquisition module is used for acquiring battery information of each battery to be detected in the whole battery pack.
The wiring fault judging module is used for determining wiring fault information by comparing battery information of each battery to be detected according to the charge and discharge states.
In this embodiment, the battery information of each battery to be detected is obtained by using the IIC communication protocol, and the charging or discharging wiring fault information is determined by comparing the battery information of each battery to be detected according to the charging and discharging state, so that the wiring fault between the battery pack and the robot control circuit board is detected and processed according to the software mode, the system is not greatly affected, the power consumption is low, the detection cost is reduced, meanwhile, the processing can be timely performed according to the detection result, the battery is prevented from being over-discharged, the system is timely closed or the charging switch is closed, and the service life of the battery is greatly prolonged.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc., and the program is executed by a computer to realize the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (6)
1. A fault detection method for a battery pack, the battery pack including at least two batteries to be detected connected in parallel, comprising:
determining a charge-discharge state of the battery pack, the charge-discharge state including a charge state or a discharge state;
acquiring battery information of each battery to be detected in the battery pack;
determining wiring fault information by comparing battery information of each battery to be detected according to the charge and discharge states,
wherein, obtaining battery information of each battery to be detected in the battery pack includes: the battery information of each battery to be detected is obtained through a communication protocol, and the battery information comprises: battery charge, battery charge current, battery discharge voltage, and battery charge voltage;
and determining wiring fault information by comparing battery information of each battery to be detected according to the charge and discharge states, wherein the wiring fault information comprises the following steps:
when the charge and discharge states are charge states, comparing the charge current of each battery to be detected, and determining wiring fault information of the battery to be detected according to the charge current; the determining the wiring fault information of the battery to be detected according to the charging current comprises the following steps: when the charging current of the battery to be detected is a first preset value and a preset condition is not met, determining that the wiring fault information of the battery to be detected is a charging wiring fault; wherein, the preset conditions include: the battery electric quantity of the battery to be detected is increased, the virtual electric quantity is full electric quantity, or the voltage of the battery to be detected is larger than the voltage of other batteries to be detected which are connected in parallel with the battery to be detected; and/or
When the charge and discharge state is a discharge state, comparing the discharge current of each battery to be detected, and determining wiring fault information of the battery to be detected according to the discharge current; the method for determining the wiring fault information of the battery to be detected according to the discharging current comprises the following steps: and when the discharge current of the battery to be detected is a second preset value and the voltage of the battery to be detected is larger than the voltages of other batteries to be detected which are connected in parallel with the battery to be detected, determining that the wiring fault information of the battery to be detected is a discharge wiring fault.
2. The fault detection method of claim 1, wherein determining wiring fault information of the battery to be detected from the charging current further comprises:
and when the charging current of the battery to be detected is a first preset value and the time length of not meeting the preset condition is greater than a first time threshold, determining that the wiring fault information of the battery to be detected is a charging wiring fault.
3. The fault detection method of claim 1, wherein determining wiring fault information of the battery to be detected from the discharge current further comprises:
and when the discharge current of the battery to be detected is a second preset value, and the duration that the voltage of the battery to be detected is greater than the voltage of other batteries to be detected connected in parallel with the battery to be detected is greater than a second time threshold, determining that the wiring fault information of the battery to be detected is a discharge wiring fault.
4. The fault detection method as claimed in claim 1, further comprising, after determining the wiring fault information within the battery pack:
and reporting the wiring fault information to an upper computer, and controlling a battery power management board to close a charging switch or a system.
5. A fault detection device for a battery pack, the battery pack including at least two batteries to be detected connected in parallel, comprising:
the charging and discharging judging module is used for determining the charging and discharging state of the battery pack, wherein the charging and discharging state comprises a charging state or a discharging state;
the battery information acquisition module is used for acquiring battery information of each battery to be detected in the battery pack;
a wiring fault judging module for determining wiring fault information by comparing the battery information of each battery to be detected according to the charge and discharge states,
wherein, obtaining battery information of each battery to be detected in the battery pack includes: the battery information of each battery to be detected is obtained through a communication protocol, and the battery information comprises: battery charge, battery charge current, battery discharge voltage, and battery charge voltage;
and determining wiring fault information by comparing battery information of each battery to be detected according to the charge and discharge states, wherein the wiring fault information comprises the following steps:
when the charge and discharge states are charge states, comparing the charge current of each battery to be detected, and determining wiring fault information of the battery to be detected according to the charge current; determining the wiring fault information of the battery to be detected according to the charging current, wherein the wiring fault information comprises the following steps: when the charging current of the battery to be detected is a first preset value and a preset condition is not met, determining that the wiring fault information of the battery to be detected is a charging wiring fault; wherein, the preset conditions include: the battery electric quantity of the battery to be detected is increased, the virtual electric quantity is full electric quantity, or the voltage of the battery to be detected is larger than the voltage of other batteries to be detected which are connected in parallel with the battery to be detected; and/or
When the charge and discharge state is a discharge state, comparing the discharge current of each battery to be detected, and determining wiring fault information of the battery to be detected according to the discharge current; determining the wiring fault information of the battery to be detected according to the discharging current, wherein the wiring fault information comprises the following steps: and when the discharge current of the battery to be detected is a second preset value and the voltage of the battery to be detected is larger than the voltages of other batteries to be detected which are connected in parallel with the battery to be detected, determining that the wiring fault information of the battery to be detected is a discharge wiring fault.
6. A fault detection system for a battery pack, comprising:
a memory for storing a program;
a processor for implementing the fault detection method as claimed in any one of claims 1 to 4 by executing a program stored in the memory.
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