CN108363012A - A kind of vehicle lithium battery startup power supply Primary Component fault detection system and method - Google Patents
A kind of vehicle lithium battery startup power supply Primary Component fault detection system and method Download PDFInfo
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- CN108363012A CN108363012A CN201810043433.3A CN201810043433A CN108363012A CN 108363012 A CN108363012 A CN 108363012A CN 201810043433 A CN201810043433 A CN 201810043433A CN 108363012 A CN108363012 A CN 108363012A
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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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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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
- G01R31/40—Testing power supplies
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Abstract
The invention discloses a kind of vehicle lithium battery startup power supply Primary Component fault detection system and method, system includes SOH detection modules, metal-oxide-semiconductor fault detection module, relay fault detection module, sampling resistor fault detection module, battery pack line loosening detection module and state evaluation module；Method includes：Detect the battery capacity of startup power supply；Detect the aging conditions of metal-oxide-semiconductor in automobile starting power supply；Detect the aging conditions of automobile starting power supply repeat circuit；Detect the aging conditions of sampling resistor in automobile starting power supply；The connection for detecting startup power supply battery pack loosens situation；According to the testing result of obtained each Primary Component, the health status of startup power supply is evaluated.The present invention is improved the reliability of startup power supply, can be widely applied to battery detection and control field by the aging conditions of each Primary Component to evaluate the holistic health state of startup power supply.
Description
Technical field
The present invention relates to battery detection and control field, especially a kind of vehicle lithium battery startup power supply Primary Component failure
Detecting system and method.
Background technology
Since automobile starting power supply immediate current is very big, and the working time is shorter, therefore to the fault detect of startup power supply
Very difficult, the existing efficiency that fault detect is carried out to startup power supply is very low.In addition, the fault detect of startup power supply includes very
Various aspects, such as battery SOH detections, metal-oxide-semiconductor fault detect, relay fault detect, sampling resistor fault detect and battery pack
Line looseness fault detection etc., wherein the cell degradation in startup power supply will make startup power supply that can not provide enough electric currents
Start automobile；Metal-oxide-semiconductor in startup power supply or Relay Aging will make the defencive function of startup power supply, for example, overcharge protection,
Cross prevention exhausts；Sampling resistor aging in startup power supply, will make startup power supply current estimation be not allowed, state is estimated
Accuracy decline is counted, system maintenance is unfavorable for；It is loosened during startup power supply use due to being connected caused by automobile vibration, in moment
It easily strikes sparks, generates dangerous under the operating mode of high current.Currently, there are no a set of complete automobile starting power protection strategy, come
The fault detect of startup power supply Primary Component is integrated, it is not comprehensive enough.
Invention content
In order to solve the above technical problems, it is an object of the invention to：A kind of comprehensively reliable, vehicle lithium battery startup is provided
Power supply Primary Component fault detection system and method.
The first technical solution for being taken of the present invention is：
A kind of vehicle lithium battery startup power supply Primary Component fault detection system, including：
SOH detection modules, the battery capacity for detecting startup power supply；
Metal-oxide-semiconductor fault detection module, the aging conditions for detecting metal-oxide-semiconductor in automobile starting power supply；
Relay fault detection module, the aging conditions for detecting automobile starting power supply repeat circuit；
Sampling resistor fault detection module, the aging conditions for detecting sampling resistor in automobile starting power supply；
Battery pack line loosens detection module, and the connection for detecting startup power supply battery pack loosens situation；
State evaluation module, for according to SOH detection modules, metal-oxide-semiconductor fault detection module, relay fault detect mould
Block, sampling resistor fault detection module and battery pack line loosen the testing result of detection module, to the health of startup power supply
State is evaluated.
Further, the battery pack line loosening detection module includes：
Voltage detection unit, the voltage value for obtaining each batteries in battery pack；
5th computing unit is used for the voltage value of each batteries according to acquisition, and the battery for calculating whole packet battery pack connects
Connect state.
Further, further include：
Cloud server, evaluation result for obtaining state evaluation module are simultaneously stored；
Vehicle central control system, evaluation result for obtaining state evaluation module are simultaneously shown by instrument board；
Mobile terminal, the data information for obtaining cloud server storage.
The second technical solution for being taken of the present invention is：
A kind of vehicle lithium battery startup power supply Primary Component fault detection method, includes the following steps：
Detect the battery capacity of startup power supply；
Detect the aging conditions of metal-oxide-semiconductor in automobile starting power supply；
Detect the aging conditions of automobile starting power supply repeat circuit；
Detect the aging conditions of sampling resistor in automobile starting power supply；
The connection for detecting startup power supply battery pack loosens situation；
According to detection obtain battery capacity, the aging conditions of metal-oxide-semiconductor, the aging conditions of relay, sampling resistor it is old
The connection for changing situation and battery pack loosens situation, evaluates the health status of startup power supply.
Further, the step for SOH to startup power supply is detected, includes the following steps：
Obtain minimum voltage of the startup power supply in start-up course；
Judge whether startup power supply is at full charge before being initiated, starts if so, being calculated according to the minimum voltage of acquisition
The calculation formula of the SOH of power supply, the SOH of the startup power supply is：
SOHli=[VLow-2.5V]/[Vlown- 2.5V] * Tcoeff,
Tcoeff=k1/ (k2*k3),
Wherein, SOHli represents the SOH of startup power supply, and VLow represents the minimum voltage of present battery, VlownRepresent new electricity
The minimum voltage that 25 DEG C of pond, Tcoeff represent temperature correction coefficient, and k1 is internal resistance of the new battery under Current Temperatures and new battery
The ratio of internal resistance at 25 DEG C, k2 are the ratio of capacity of the new battery under Current Temperatures and new battery capacity at 25 DEG C,
K3 is open-circuit voltage of the open-circuit voltage with new battery when fully charged at 25 DEG C when new battery is fully charged under Current Temperatures
Ratio；
Conversely, being then not processed.
Further, the step for metal-oxide-semiconductor failure to startup power supply is detected, includes the following steps：
Obtain leakage current when metal-oxide-semiconductor turns off in startup power supply float；
According to the leakage current of acquisition, the degree of aging of metal-oxide-semiconductor, the calculating of the degree of aging SOHmos of the metal-oxide-semiconductor are calculated
Formula is：
SOHmos=[2*ILeakn-ILeak]/[ILeakn],
Wherein, ILeak indicates leakage current when current metal-oxide-semiconductor turns off in startup power supply float, ILeaknExpression is opened
Leakage current in dynamic power supply float when new metal-oxide-semiconductor shutdown.
Further, the step for relay fault detection module to startup power supply is detected, including following step
Suddenly：
Relay is obtained from the acquisition cut-off signals moment to the time difference the actual switch-off moment；
According to the time difference of acquisition, the degree of aging of relay is calculated, the degree of aging SOHrelay's of the relay
Calculation formula is：
SOHrelay=[2*tDelayn-tDelay]/[tDelayn],
Wherein, tDelay represents current relay from the acquisition cut-off signals moment to the time the actual switch-off moment
Difference, tDelaynNew relay is from obtaining the cut-off signals moment to the time difference the actual switch-off moment.
Further, the step for sampling resistor failure to startup power supply is detected, includes the following steps：
Obtain maximum temperature rise value of the sampling resistor in the start-up course of startup power supply；
According to the maximum temperature rise value of acquisition, the degree of aging of sampling resistor, the degree of aging of the sampling resistor are calculated
The calculation formula of SOHsense is：
SOHsense=[2*Trn-Tr*β]/[Trn* β],
β=1+ (Trn- Tr) ^2*m,
Wherein, Tr is the maximum temperature rise value of present sample resistance, TrnIt is the maximum temperature rise value of new sampling resistor, β is temperature
Correction factor is spent, m is temperature diffusivity.
Further, the battery pack line to startup power supply loosens the step for situation is detected, including following step
Suddenly：
Obtain voltage max and voltage of the every batteries in battery pack in a period of time after automobile starting
Minimum value, and the section between voltage max and voltage minimum is divided into 20 subintervals；
Obtain the frequency that 20 subintervals are respectively at per the voltage of batteries during this period of time；
It calculates the simplification Shannon per batteries and samples entropy, the calculation formula of the simplification Shannon sampling entropy per batteries
For：
Wherein, Entropy (k) indicates that the simplification Shannon of kth batteries samples entropy, p (k)iIndicate kth batteries i-th
The frequency in a subinterval；
Entropy is sampled according to the simplification Shannon of every batteries of calculating, calculates the simplification Shannon sampling entropy of whole packet battery pack, institute
State whole packet battery pack simplification Shannon sampling entropy calculation formula be：
Entropy=max (Entropy (k)), k=1,2 ..., n,
Wherein, n is the cell number in startup power supply, and max () expressions are maximized；
Entropy is sampled according to the simplification Shannon of whole packet battery pack, calculates the health status of battery connection, the battery connection
The calculation formula of health status SOHentropy is：
SOHentropy=[2*Entropyn-Entropy]/[Entropyn],
Wherein, EntropynIndicate that the simplification Shannon sampling entropy of new battery pack, Entropy indicate the letter of current battery
Change Shannon and samples entropy.
Further, further include that the evaluation result of the health status of startup power supply is uploaded in cloud server, vehicle to control
The step of system and mobile terminal.
The beneficial effects of the invention are as follows：The present invention by SOH to startup power supply, metal-oxide-semiconductor failure, relay failure, adopt
Sample Resistance Fault and battery pack line loosen situation and are detected, then according to detection as a result, health to startup power supply
State is evaluated, and all Primary Component fault detects of startup power supply have been carried out comprehensive integration, have been able to detect that each pass
The aging conditions of key device, and the health status evaluation of startup power supply is obtained with this, substantially increase the reliability of startup power supply.
Description of the drawings
Fig. 1 is a kind of overall structure block diagram of vehicle lithium battery startup power supply Primary Component fault detection system of the present invention；
Fig. 2 is a kind of step flow chart of vehicle lithium battery startup power supply Primary Component fault detection method of the present invention.
Specific implementation mode
The present invention is further explained and is illustrated with specific embodiment with reference to the accompanying drawings of the specification.For of the invention real
The step number in example is applied, is arranged only for the purposes of illustrating explanation, the sequence between step does not do any restriction, implements
The execution sequence of each step in example can be adaptively adjusted according to the understanding of those skilled in the art.
Referring to Fig.1, a kind of vehicle lithium battery startup power supply Primary Component fault detection system of the present invention, including：
SOH detection modules, the battery capacity for detecting startup power supply；
Metal-oxide-semiconductor fault detection module, the aging conditions for detecting metal-oxide-semiconductor in automobile starting power supply；
Relay fault detection module, the aging conditions for detecting automobile starting power supply repeat circuit；
Sampling resistor fault detection module, the aging conditions for detecting sampling resistor in automobile starting power supply；
Battery pack line loosens detection module, and the connection for detecting startup power supply battery pack loosens situation；
State evaluation module, for according to SOH detection modules, metal-oxide-semiconductor fault detection module, relay fault detect mould
Block, sampling resistor fault detection module and battery pack line loosen the testing result of detection module, to the health of startup power supply
State is evaluated.
Wherein, the output end of the SOH detection modules, the output end of metal-oxide-semiconductor fault detection module, relay fault detect
The output end that the output end of module, the output end of sampling resistor fault detection module and battery pack line loosen detection module is equal
It is connect with the input terminal of state evaluation module.
Wherein, SOH indicates the capacity of accumulator.
Referring to Fig.1, it is further used as preferred embodiment, the SOH detection modules include：
Analog-digital converter, for obtaining minimum voltage of the startup power supply in start-up course；
First computing unit, the minimum voltage for being obtained according to analog-to-digital conversion device, calculates the battery capacity of startup power supply；
The metal-oxide-semiconductor fault detection module includes：
Galvanometer, for measuring leakage current when metal-oxide-semiconductor turns off in startup power supply float；
Second computing unit calculates the degree of aging of metal-oxide-semiconductor for the leakage current according to amperometric measurement；
The relay fault detection module includes：
Timer, for calculating relay from the acquisition cut-off signals moment to the time difference the actual switch-off moment；
Third computing unit, calculates the degree of aging of relay at the time difference for being calculated according to timer；
The sampling resistor fault detection module includes：
Temperature sensor, for obtaining maximum temperature rise value of the sampling resistor in the start-up course of startup power supply；
4th computing unit, the maximum temperature rise value for being obtained according to temperature sensor, calculates the aging journey of sampling resistor
Degree；
The battery pack line loosens detection module：
Voltage detection unit, the voltage value for obtaining each batteries in battery pack；
5th computing unit is used for the voltage value of each batteries according to acquisition, and the battery for calculating whole packet battery pack connects
Connect state.
Wherein, the output end of the analog-digital converter connects the input terminal of the first computing unit, the output of the galvanometer
The input terminal of the second computing unit of end connection, the input terminal of the output end connection third computing unit of the timer, the temperature
The output end for spending sensor connects the input terminal of the 4th computing unit, and the output end connection the 5th of the voltage detection unit calculates
The input terminal of unit, the output of the output end of first computing unit, the output end, third computing unit of the second computing unit
The output end at end, the output end of the 4th computing unit and the 5th computing unit is connect with the input terminal of state evaluation module.
Referring to Fig.1, it is further used as preferred embodiment, further includes：
Cloud server, evaluation result for obtaining state evaluation module are simultaneously stored；
Vehicle central control system, evaluation result for obtaining state evaluation module are simultaneously shown by instrument board；
Mobile terminal, the data information for obtaining cloud server storage.
Wherein, the input terminal of the input terminal of the cloud server and vehicle central control system is defeated with state evaluation module
Outlet connects, the input terminal of the output end connection mobile terminal of the cloud server.
With reference to Fig. 2, a kind of vehicle lithium battery startup power supply Primary Component fault detection method of the present invention, including following step
Suddenly：
Detect the battery capacity of startup power supply；
Detect the aging conditions of metal-oxide-semiconductor in automobile starting power supply；
Detect the aging conditions of automobile starting power supply repeat circuit；
Detect the aging conditions of sampling resistor in automobile starting power supply；
The connection for detecting startup power supply battery pack loosens situation；
According to detection obtain battery capacity, the aging conditions of metal-oxide-semiconductor, the aging conditions of relay, sampling resistor it is old
The connection for changing situation and battery pack loosens situation, evaluates the health status of startup power supply.
It is further used as preferred embodiment, the step for SOH to startup power supply is detected, including it is following
Step：
Obtain minimum voltage of the startup power supply in start-up course；
Judge whether startup power supply is at full charge before being initiated, starts if so, being calculated according to the minimum voltage of acquisition
The calculation formula of the SOH of power supply, the SOH of the startup power supply is：
SOHli=[VLow-2.5V]/[Vlown- 2.5V] * Tcoeff,
Tcoeff=k1/ (k2*k3),
Wherein, SOHli represents the SOH of startup power supply, and VLow represents the minimum voltage of present battery, VlownRepresent new electricity
The minimum voltage that 25 DEG C of pond, Tcoeff represent temperature correction coefficient, and k1 is internal resistance of the new battery under Current Temperatures and new battery
The ratio of internal resistance at 25 DEG C, k2 are the ratio of capacity of the new battery under Current Temperatures and new battery capacity at 25 DEG C,
K3 is open-circuit voltage of the open-circuit voltage with new battery when fully charged at 25 DEG C when new battery is fully charged under Current Temperatures
Ratio；
Conversely, being then not processed.
Wherein, the present invention is detected the SOH of startup power supply and uses simple and practicable fast algorithm, can be in the several seconds
Interior completion voltage measurement and SOH are calculated, and substantially increase detection efficiency, and practicability is high.
It is further used as preferred embodiment, the step for metal-oxide-semiconductor failure to startup power supply is detected, packet
Include following steps：
Obtain leakage current when metal-oxide-semiconductor turns off in startup power supply float；
According to the leakage current of acquisition, the degree of aging of metal-oxide-semiconductor, the calculating of the degree of aging SOHmos of the metal-oxide-semiconductor are calculated
Formula is：
SOHmos=[2*ILeakn-ILeak]/[ILeakn],
Wherein, ILeak indicates leakage current when current metal-oxide-semiconductor turns off in startup power supply float, ILeaknExpression is opened
Leakage current in dynamic power supply float when new metal-oxide-semiconductor shutdown.
It is further used as preferred embodiment, the relay fault detection module to startup power supply is detected this
One step, includes the following steps：
Relay is obtained from the acquisition cut-off signals moment to the time difference the actual switch-off moment；
According to the time difference of acquisition, the degree of aging of relay is calculated, the degree of aging SOHrelay's of the relay
Calculation formula is：
SOHrelay=[2*tDelayn-tDelay]/[tDelayn],
Wherein, tDelay represents current relay from the acquisition cut-off signals moment to the time the actual switch-off moment
Difference, tDelaynNew relay is from obtaining the cut-off signals moment to the time difference the actual switch-off moment.
It is further used as preferred embodiment, the sampling resistor failure to startup power supply is detected this step
Suddenly, include the following steps：
Obtain maximum temperature rise value of the sampling resistor in the start-up course of startup power supply；
According to the maximum temperature rise value of acquisition, the degree of aging of sampling resistor, the degree of aging of the sampling resistor are calculated
The calculation formula of SOHsense is：
SOHsense=[2*Trn-Tr*β]/[Trn* β],
β=1+ (Trn- Tr) ^2*m,
Wherein, Tr is the maximum temperature rise value of present sample resistance, TrnIt is the maximum temperature rise value of new sampling resistor, β is temperature
Correction factor is spent, m is temperature diffusivity.
It is further used as preferred embodiment, the battery pack line to startup power supply loosens situation and is detected this
One step, includes the following steps：
Obtain voltage max and voltage of the every batteries in battery pack in a period of time after automobile starting
Minimum value, and the section between voltage max and voltage minimum is divided into 20 subintervals；
Obtain the frequency that 20 subintervals are respectively at per the voltage of batteries during this period of time；
It calculates the simplification Shannon per batteries and samples entropy, the calculation formula of the simplification Shannon sampling entropy per batteries
For：
Wherein, Entropy (k) indicates that the simplification Shannon of kth batteries samples entropy, p (k)iIndicate kth batteries i-th
The frequency in a subinterval；
Entropy is sampled according to the simplification Shannon of every batteries of calculating, calculates the simplification Shannon sampling entropy of whole packet battery pack, institute
State whole packet battery pack simplification Shannon sampling entropy calculation formula be：
Entropy=max (Entropy (k)), k=1,2 ..., n,
Wherein, n is the cell number in startup power supply, and max () expressions are maximized；
Entropy is sampled according to the simplification Shannon of whole packet battery pack, calculates the health status of battery connection, the battery connection
The calculation formula of health status SOHentropy is：
SOHentropy=[2*Entropyn-Entropy]/[Entropyn],
Wherein, EntropynIndicate that the simplification Shannon sampling entropy of new battery pack, Entropy indicate the letter of current battery
Change Shannon and samples entropy.
It is further used as preferred embodiment, further includes that the evaluation result of the health status of startup power supply is uploaded to cloud
The step of holding server, vehicle central control system and mobile terminal.
A kind of specific embodiment of vehicle lithium battery startup power supply Primary Component fault detection method of the present invention it is worked
Journey is as follows：
S1, the SOH of startup power supply is detected；
Wherein, step S1 specifically includes following steps：
S11, minimum voltage of the startup power supply in start-up course is obtained：The present embodiment embeds ADC to grab using LTC6811
It is 1mV to take minimum cell voltage VLow of the startup power supply in start-up course, the precision that the LTC6811 embeds ADC.
S12, judge whether startup power supply is at full charge before being initiated, if so, being calculated according to the minimum voltage of acquisition
The calculation formula of the SOH of startup power supply, the SOH of the startup power supply is：
SOHli=[VLow-2.5V]/[Vlown- 2.5V] * Tcoeff,
Tcoeff=k1/ (k2*k3),
Wherein, SOHli represents the SOH of startup power supply, and Tcoeff represents temperature correction coefficient, and k1 is new battery in current temperature
The ratio of internal resistance and internal resistance of the new battery at 25 DEG C under degree, k2 are that capacity of the new battery under Current Temperatures exists with new battery
The ratio of capacity at 25 DEG C, k3 are that open-circuit voltage when new battery is fully charged under Current Temperatures is full of with new battery at 25 DEG C
The ratio of open-circuit voltage when electric, in the present embodiment, these three coefficients of k1, k2 and k3 are tabled look-up acquisition by battery data handbook；
Conversely, if startup power supply is not fully charged before automobile starting, SOHli is not processed without definition.
S2, the metal-oxide-semiconductor failure of startup power supply is detected；
Wherein, the step S2 specifically includes following steps：
Leakage current when metal-oxide-semiconductor turns off in S21, acquisition startup power supply float：The present embodiment is using in startup power supply
Leakage current ILeak of the amperometric measurement set in float when metal-oxide-semiconductor shutdown, it is preferable that the galvanometer uses national standard
75mV50A copper-manganeses shunting meter；
S22, the leakage current according to acquisition calculate the degree of aging of metal-oxide-semiconductor, the degree of aging SOHmos's of the metal-oxide-semiconductor
Calculation formula is：
SOHmos=[2*ILeakn-ILeak]/[ILeakn],
Wherein, ILeak indicates leakage current when metal-oxide-semiconductor turns off in startup power supply float；
S3, the relay fault detection module of startup power supply is detected；
Wherein, the step S3 includes the following steps：
S31, relay is obtained from the acquisition cut-off signals moment to the time difference the actual switch-off moment：The present embodiment is adopted
With timer circuit calculate from controller send out shutdown relay signal at the time of t1, arrive relay actual switch-off at the time of t2 it
Between difference, i.e. tDelay=t2-t1, it is preferable that the timer of the present embodiment use main control chip stm32F407 inside when
Clock timing；In addition, the acquisition modes of relay actual switch-off moment t2, are found using high-speed ADC (i.e. analog-digital converter)
At the time of startup power supply output voltage is reduced to 0V；
S32, the time difference according to acquisition calculate the degree of aging of relay, the degree of aging of the relay
The calculation formula of SOHrelay is：
SOHrelay=[2*tDelayn-tDelay]/[tDelayn],
Wherein, tDelay represents relay from the acquisition cut-off signals moment to the time difference the actual switch-off moment；
S4, the sampling resistor failure of startup power supply is detected；
Wherein, the step S4 specifically includes following steps：
S41, maximum temperature rise value of the sampling resistor in the start-up course of startup power supply is obtained：The present embodiment is passed using temperature
Sensor obtains maximum temperature rise value Tr of the sampling resistor in the start-up course of startup power supply, it is preferable that the temperature of the present embodiment
Sensor selects the high-precision semiconductor temperature sensor of 0.3 DEG C of LMT87 types typical accuracy to realize；
S42, the maximum temperature rise value according to acquisition calculate the degree of aging of sampling resistor, the aging journey of the sampling resistor
Degree SOHsense calculation formula be：
SOHsense=[2*Trn-Tr*β]/[Trn* β],
β=1+ (Trn- Tr) ^2*m,
Wherein, Tr is the maximum temperature rise value of sampling resistor, and β is temperature correction coefficient, and m is the temperature determined according to actual environment
Diffusion coefficient is spent, the value of m is 0.01 in the present embodiment；
S5, the battery pack line loosening situation of startup power supply is detected；
Wherein, step S5 specifically includes following steps：
S51, obtain voltage max in a period of time after automobile starting of every batteries in battery pack and
Voltage minimum, and the section between voltage max and voltage minimum is divided into 20 subintervals；The present embodiment uses
LTC6811 chips sample voltage, and the frequency that the present embodiment obtains voltage is 1Hz；
S52, frequency (the i.e. p (k) that 20 subintervals are respectively at per the voltage of batteries during this period of time is obtained1, p
(k)2..., p (k)20)；
S53, (the simplification Shannon sampling entropy of battery serial number k), the simplification Shannon per batteries per batteries are calculated
Sampling entropy calculation formula be：
Wherein, Entropy (k) indicates that the simplification Shannon of kth batteries samples entropy, p (k)iIndicate kth batteries i-th
The frequency in a subinterval；
S54, entropy is sampled according to the simplification Shannon of every batteries of calculating, calculates the simplification Shannon sampling of whole packet battery pack
Entropy, the whole packet battery pack simplification Shannon sampling entropy calculation formula be：
Entropy=max (Entropy (k)), k=1,2 ..., n,
Wherein, n is the cell number in startup power supply, and max () expressions are maximized, and the startup power supply of the present embodiment detection is
The cell number of 12V startup power supplies, the startup power supply is 4 strings；
S55, entropy is sampled according to the simplification Shannon of whole packet battery pack, calculates the health status of battery connection, the battery connects
The calculation formula of the health status SOHentropy connect is：
SOHentropy=[2*Entropyn-Entropy]/[Entropyn]；
S6, connect according to the SOH of startup power supply, metal-oxide-semiconductor failure, relay failure, sampling resistor failure and battery pack
Line loosen situation be detected as a result, the health status to startup power supply is evaluated；
Wherein, the calculation formula that the health status SOH to startup power supply is evaluated is：
SOH=min (SOHli, SOHmos, SOHrelay, SOHsense, SOHentropy),
Wherein, min () is to be minimized, and when the SOH being calculated is less than 20%, system sends out alarm, works as SOH=0%
When startup power supply declaration scrap；
The present invention loosens metal-oxide-semiconductor fault detect, sampling resistor fault detect, relay fault detect, battery pack connection
Detection etc. health status eventually by the evaluation criterion of battery SOH come carry out unification, to realize with uniformly evaluation criteria come
The aging performance for evaluating all Primary Components increases the actual use value of assessment.
S7, the evaluation result of the health status of startup power supply is uploaded to cloud server, vehicle central control system and shifting
Dynamic terminal, wherein the health status of startup power supply can be shown by vehicle central control system by instrument board.
It is to be illustrated to the preferable implementation of the present invention, but the present invention is not limited to the embodiment above, it is ripe
Various equivalent variations or replacement can also be made under the premise of without prejudice to spirit of that invention by knowing those skilled in the art, this
Equivalent deformation or replacement are all contained in the application claim limited range a bit.
Claims (10)
1. a kind of vehicle lithium battery startup power supply Primary Component fault detection system, it is characterised in that：Including：
SOH detection modules, the battery capacity for detecting startup power supply；
Metal-oxide-semiconductor fault detection module, the aging conditions for detecting metal-oxide-semiconductor in automobile starting power supply；
Relay fault detection module, the aging conditions for detecting automobile starting power supply repeat circuit；
Sampling resistor fault detection module, the aging conditions for detecting sampling resistor in automobile starting power supply；
Battery pack line loosens detection module, and the connection for detecting startup power supply battery pack loosens situation；
State evaluation module, for according to SOH detection modules, metal-oxide-semiconductor fault detection module, relay fault detection module, adopt
Sample Resistance Fault detection module and battery pack line loosen the testing result of detection module, to the health status of startup power supply into
Row evaluation.
2. a kind of vehicle lithium battery startup power supply Primary Component fault detection system according to claim 1, feature exist
In：The battery pack line loosens detection module：
Voltage detection unit, the voltage value for obtaining each batteries in battery pack；
5th computing unit is used for the voltage value of each batteries according to acquisition, calculates the battery connection shape of whole packet battery pack
State.
3. a kind of vehicle lithium battery startup power supply Primary Component fault detection system according to claim 1, feature exist
In：Further include：
Cloud server, evaluation result for obtaining state evaluation module are simultaneously stored；
Vehicle central control system, evaluation result for obtaining state evaluation module are simultaneously shown by instrument board；
Mobile terminal, the data information for obtaining cloud server storage.
4. a kind of vehicle lithium battery startup power supply Primary Component fault detection method, it is characterised in that：Include the following steps：
Detect the battery capacity of startup power supply；
Detect the aging conditions of metal-oxide-semiconductor in automobile starting power supply；
Detect the aging conditions of automobile starting power supply repeat circuit；
Detect the aging conditions of sampling resistor in automobile starting power supply；
The connection for detecting startup power supply battery pack loosens situation；
Battery capacity, the aging conditions of metal-oxide-semiconductor, the aging conditions of relay, the aging feelings of sampling resistor obtained according to detection
The connection of condition and battery pack loosens situation, evaluates the health status of startup power supply.
5. a kind of vehicle lithium battery startup power supply Primary Component fault detection method according to claim 4, feature exist
In：The step for SOH to startup power supply is detected, includes the following steps：
Obtain minimum voltage of the startup power supply in start-up course；
Judge whether startup power supply is at full charge before being initiated, if so, calculating startup power supply according to the minimum voltage of acquisition
SOH, the calculation formula of the SOH of the startup power supply is：
SOHli=[VLow-2.5V]/[Vlown- 2.5V] * Tcoeff,
Tcoeff=k1/ (k2*k3),
Wherein, SOHli represents the SOH of startup power supply, and VLow represents the minimum voltage of present battery, VlownRepresent 25 DEG C of new battery
Minimum voltage, Tcoeff represents temperature correction coefficient, k1 be internal resistance of the new battery under Current Temperatures with new battery at 25 DEG C
Under internal resistance ratio, k2 is the ratio of capacity of the new battery under Current Temperatures and new battery capacity at 25 DEG C, and k3 is new
The ratio of open-circuit voltage of the open-circuit voltage with new battery when fully charged at 25 DEG C when battery is fully charged under Current Temperatures；
Conversely, being then not processed.
6. a kind of vehicle lithium battery startup power supply Primary Component fault detection method according to claim 4, feature exist
In：The step for metal-oxide-semiconductor failure to startup power supply is detected, includes the following steps：
Obtain leakage current when metal-oxide-semiconductor turns off in startup power supply float；
According to the leakage current of acquisition, the degree of aging of metal-oxide-semiconductor, the calculation formula of the degree of aging SOHmos of the metal-oxide-semiconductor are calculated
For：
SOHmos=[2*ILeakn-ILeak]/[ILeakn],
Wherein, ILeak indicates leakage current when current metal-oxide-semiconductor turns off in startup power supply float, ILeaknIndicate startup power supply
Leakage current in float when new metal-oxide-semiconductor shutdown.
7. a kind of vehicle lithium battery startup power supply Primary Component fault detection method according to claim 4, feature exist
In：The step for relay fault detection module to startup power supply is detected, includes the following steps：
Relay is obtained from the acquisition cut-off signals moment to the time difference the actual switch-off moment；
According to the time difference of acquisition, the degree of aging of relay, the calculating of the degree of aging SOHrelay of the relay are calculated
Formula is：
SOHrelay=[2*tDelayn-tDelay]/[tDelayn],
Wherein, tDelay represent current relay from obtain the cut-off signals moment to the time difference the actual switch-off moment,
tDelaynNew relay is from obtaining the cut-off signals moment to the time difference the actual switch-off moment.
8. a kind of vehicle lithium battery startup power supply Primary Component fault detection method according to claim 4, feature exist
In：The step for sampling resistor failure to startup power supply is detected, includes the following steps：
Obtain maximum temperature rise value of the sampling resistor in the start-up course of startup power supply；
According to the maximum temperature rise value of acquisition, the degree of aging of sampling resistor, the degree of aging of the sampling resistor are calculated
The calculation formula of SOHsense is：
SOHsense=[2*Trn-Tr*β]/[Trn* β],
β=1+ (Trn- Tr) ^2*m,
Wherein, Tr is the maximum temperature rise value of present sample resistance, TrnIt is the maximum temperature rise value of new sampling resistor, β is that temperature is repaiied
Positive coefficient, m are temperature diffusivities.
9. a kind of vehicle lithium battery startup power supply Primary Component fault detection method according to claim 4, feature exist
In：The battery pack line to startup power supply loosens the step for situation is detected, and includes the following steps：
It is minimum to obtain voltage max and voltage of the every batteries in battery pack in a period of time after automobile starting
Value, and the section between voltage max and voltage minimum is divided into 20 subintervals；
Obtain the frequency that 20 subintervals are respectively at per the voltage of batteries during this period of time；
It calculates the simplification Shannon per batteries and samples entropy, the calculation formula of the simplification Shannon sampling entropy per batteries is：
Wherein, Entropy (k) indicates that the simplification Shannon of kth batteries samples entropy, p (k)iIndicate kth batteries in i-th of sub-district
Between frequency；
Entropy is sampled according to the simplification Shannon of every batteries of calculating, calculates the simplification Shannon sampling entropy of whole packet battery pack, it is described whole
Packet battery pack simplification Shannon sampling entropy calculation formula be：
Entropy=max (Entropy (k)), k=1,2 ..., n,
Wherein, n is the cell number in startup power supply, and max () expressions are maximized；
Entropy is sampled according to the simplification Shannon of whole packet battery pack, calculates the health status of battery connection, the health of the battery connection
The calculation formula of state SOHentropy is：
SOHentropy=[2*Entropyn-Entropy]/[Entropyn],
Wherein, EntropynIndicate that the simplification Shannon sampling entropy of new battery pack, Entropy indicate that simplifying for current battery is fragrant
Agriculture samples entropy.
10. according to a kind of vehicle lithium battery startup power supply Primary Component fault detection method of claim 4-9 any one of them,
It is characterized in that：Further include that the evaluation result of the health status of startup power supply is uploaded to cloud server, vehicle central control system
And the step of mobile terminal.
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