CN108594123A - Battery pack SOH detection method, device and equipment - Google Patents
Battery pack SOH detection method, device and equipment Download PDFInfo
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- CN108594123A CN108594123A CN201810196318.XA CN201810196318A CN108594123A CN 108594123 A CN108594123 A CN 108594123A CN 201810196318 A CN201810196318 A CN 201810196318A CN 108594123 A CN108594123 A CN 108594123A
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Abstract
The embodiment of the invention discloses a method, a device and equipment for detecting SOH of a battery pack. The method comprises the following steps: sending a request for detecting the SOH of the battery pack to a charging pile; if the charging pile returns a message for executing the SOH detection of the battery pack, discharging the battery until the voltage of the battery reaches the discharging cut-off voltage; sending a charging instruction to a charging pile to enable the charging pile to start charging the battery until the voltage of the battery reaches a charging cut-off voltage; sending a stopping instruction to a charging pile to enable the charging pile to stop charging the battery, and detecting the charging capacity of the battery; judging whether the detected charging capacity is effective or not according to the charging capacity returned by the charging pile and a preset capacity error; and if the detected charging capacity is effective, calculating the SOH value of the battery according to the detected charging capacity. By adopting the technical scheme in the embodiment of the invention, the detection precision of the SOH of the battery pack can be improved.
Description
Technical field
The present invention relates to a kind of battery technology field more particularly to battery pack SOH detection methods, device and equipment.
Background technology
As the non-renewable energy resources such as oil gradually use up, electric power energy such as lithium-ion-power cell is in new energy market
On enjoy great popularity.Aging or deterioration necessarily occurs since battery is used for a long time, to health status (the State of of battery
Health, SOH), also referred to as service life state carries out estimating to be necessary.For example, the current lithium ion battery service life one on the market
As for 8 years capacity attenuations to 70% (or 5 years capacity attenuations to 80%), if after battery capacity decaying, still to determine when shipment
The multiplying power (such as 1C) of justice carries out charge and discharge, then practical multiplying power can be bigger than normal, and there are overcurrent risks.
The detection method of battery pack SOH in the prior art is that vehicle is made to remain static or low current state, so
Afterwards according to sampled signal estimate battery be full of after with certain multiplying power discharging to blanking voltage when discharge capacity with it is corresponding nominally
The ratio of capacity.
But the inventors of the present application found that the accuracy of detection of battery pack SOH in the prior art is easy by sampling essence
The influence of the factors such as degree, time error and return loss, causes the accuracy of detection of battery pack SOH to reduce.
Invention content
An embodiment of the present invention provides a kind of battery pack SOH detection methods, device and equipment, can improve battery pack SOH
Accuracy of detection.
In a first aspect, an embodiment of the present invention provides a kind of battery pack SOH detection methods, it is used for BMS, this method to include：
The request that battery pack SOH is detected is sent to charging pile；
If charging pile returns to the message for executing battery pack SOH detections, discharge battery pack, until the voltage of battery pack reaches
To electric discharge by voltage；
Charging instruction is sent to charging pile, makes charging pile start to charge to battery pack, is filled until the voltage of battery pack reaches
Electricity is by voltage；
Halt instruction is sent to charging pile, makes charging pile stop charging to battery pack, detects the charging capacity of battery pack；
The charging capacity and predetermined volumes error returned according to charging pile, judges whether the charging capacity detected is effective；
If the charging capacity detected is effective, the SOH value of battery pack is calculated according to the charging capacity detected.
In some embodiments of first aspect, this method further includes：If charging pile return does not execute battery pack SOH detections
Message or charging pile do not return to any message detected about SOH, then so that charging pile is charged normal battery pack.
In some embodiments of first aspect, the charging capacity and predetermined volumes error returned according to charging pile judges
Whether the charging capacity detected is effective, including：Calculate the difference between the charging capacity returned and the charging capacity detected
Absolute value；Calculate the ratio between absolute value and the charging capacity detected；If ratio is less than predetermined volumes error, judge
The charging capacity detected is effective；If ratio no less than predetermined volumes error, judges that the charging capacity detected is invalid.
In some embodiments of first aspect, if the message for executing battery pack SOH detections is returned in charging pile, to electricity
Chi Bao discharges, and discharges by voltage until the voltage of battery pack reaches, and between charging pile transmission charging instruction, method is also wrapped
It includes：Battery pack is set to stand scheduled duration.
In some embodiments of first aspect, halt instruction is sent to charging pile, charging pile stopping is made to fill battery pack
Electricity detects the charging capacity of battery pack, including：Halt instruction is sent to charging pile, charging pile is made to stop charging to battery pack；Sentence
Whether the charging current of disconnected battery pack is reduced to predetermined value；If the charging current of battery pack is reduced to predetermined value, battery is detected
The charging capacity of packet.
Second aspect, an embodiment of the present invention provides a kind of battery pack SOH detection methods, are used for battery pack SOH detection systems
System, this method include：
BMS sends the request that battery pack SOH is detected to charging pile；
Charging pile receives the request for the battery pack SOH detections that BMS is sent；
If charging pile returns to the message for executing battery pack SOH detections, BMS discharges to battery pack, until the electricity of battery pack
Pressure reaches electric discharge by voltage；
BMS sends charging instruction to charging pile, and in response to charging instruction, charging pile starts to charge to battery pack, Zhi Dao electricity
The voltage of Chi Bao reaches charging by voltage；
BMS sends halt instruction to charging pile, and in response to halt instruction, charging pile stops charging to battery pack, detection electricity
The charging capacity of Chi Bao；
The charging capacity and predetermined volumes error that BMS is returned according to charging pile, judge whether the charging capacity detected has
Effect；
If the charging capacity detected is effective, BMS calculates the SOH value of battery pack according to the charging capacity detected.
The third aspect, an embodiment of the present invention provides a kind of battery management system, which includes：
First sending module, for sending the request that battery pack SOH is detected to charging pile；
Discharge module discharges to battery pack if returning to the message for executing battery pack SOH detections for charging pile, until
The voltage of battery pack reaches electric discharge by voltage；
First charging module makes charging pile start to charge to battery pack, Zhi Dao electricity for sending charging instruction to charging pile
The voltage of Chi Bao reaches charging by voltage；
First stopping modular makes charging pile stop charging to battery pack, detection electricity for sending halt instruction to charging pile
The charging capacity of Chi Bao；
Judgment module, the charging capacity for being returned according to charging pile and predetermined volumes error, judge the charging detected
Whether capacity is effective；
Computing module calculates battery pack if the charging capacity for detecting is effective according to the charging capacity detected
SOH value.
In some embodiments of fourth aspect, judgment module includes：First computing unit, for calculating the charging returned
The absolute value of difference between capacity and the charging capacity detected；Second computing unit, for calculating absolute value and detecting
Charging capacity between ratio；
Judging unit judges that the charging capacity detected is effective if being less than predetermined volumes error for ratio；If ratio
No less than predetermined volumes error, then judge that the charging capacity detected is invalid.
Fourth aspect, an embodiment of the present invention provides a kind of charging pile, which includes：Receiving module, for receiving
The request for the battery pack SOH detections that BMS is sent；Second sending module, for according to user's detection demand, to BMS return whether
Execute the message of battery pack SOH detections；Second charging module starts to fill battery pack for the charging instruction in response to BMS
Electricity；Second stopping modular stops charging to battery pack, and return to charging capacity to BMS for the halt instruction in response to BMS.
5th aspect, an embodiment of the present invention provides a kind of battery pack SOH detecting systems, which is characterized in that including：As above
The battery management system and charging pile as described above.
Electric stake sends the request of battery pack SOH detections, right if charging pile returns to the message for executing battery pack SOH detections
Battery pack is discharged, until the voltage of battery pack reaches electric discharge by voltage；Then charging instruction is sent to charging pile, makes charging pile
Start to charge to battery pack, until the voltage of battery pack reaches charging by voltage；Then halt instruction is sent to charging pile, made
Charging pile stops charging to battery pack, detects the charging capacity of battery pack；Finally according to the charging capacity of charging pile return and in advance
Constant volume error judges whether the charging capacity detected is effective, if the charging capacity detected is effective, according to what is detected
Charging capacity calculates the SOH value of battery pack.
As noted previously, as the battery pack SOC detection methods in the embodiment of the present invention can be filled according to what charging pile returned
Capacitance and predetermined volumes error judge whether the charging capacity detected is effective, only when the charging capacity detected is effective
When, just the SOH value of battery pack can be calculated according to the charging capacity detected, therefore can avoid being missed by sampling precision, time
The influence of the factors such as difference and return loss, so as to improve the SOH accuracy of detection of battery pack.
Description of the drawings
From below in conjunction with the accompanying drawings to the present invention specific implementation mode description in may be better understood the present invention wherein,
Same or analogous reference numeral indicates same or analogous feature.
Fig. 1 is the flow diagram for the battery SOC detection method that first embodiment of the invention provides；
Fig. 2 is the flow diagram for the battery SOC detection method that second embodiment of the invention provides；
Fig. 3 is the flow diagram for the battery SOC detection method that third embodiment of the invention provides；
Fig. 4 is the flow diagram for the battery SOC detection method that fourth embodiment of the invention provides；
Fig. 5 is the flow diagram for the battery SOC detection method that fifth embodiment of the invention provides；
Fig. 6 is the structural schematic diagram of battery management system provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of charging pile provided in an embodiment of the present invention.
Specific implementation mode
The feature and exemplary embodiment of the various aspects of the embodiment of the present invention is described more fully below.Following detailed
In description, it is proposed that many details, in order to provide the comprehensive understanding to the embodiment of the present invention.
An embodiment of the present invention provides a kind of battery pack SOH detection methods, device and equipment, can be carried out by charging pile
Battery pack SOC calibration, to improve the accuracy of detection of battery pack SOH.
It should be noted that the battery pack in the embodiment of the present invention can be lithium ion battery, lithium metal battery, plumbic acid electricity
Pond, nickel separation cell, Ni-MH battery, lithium-sulfur cell, lithium-air battery or sodium-ion battery, do not limit herein.From scale
Speech, power battery to be measured may be battery core monomer, can also be battery modules, does not limit herein.
Fig. 1 is the flow diagram for the battery pack SOC detection methods that first embodiment of the invention provides.Shown in Fig. 1
Battery pack SOC detection methods include step 101 to step 106, are used for battery management system BMS.
In a step 101, the request that battery pack SOH is detected is sent to charging pile.
In some embodiments, " SOH inspections can be pressed by user's selection after the plug in rifle of charging pile is inserted into Rechargeable vehicle
Survey " button, or SOH detection functions are opened by cell phone application, it then shakes hands, that is, is confirmed before charging by BMS actives in charging
The request that battery pack SOH is detected is sent to charging pile.
Wherein, request method can be carried out by a newly-increased frame CAN message or other modes, if BMS and charging pile both sides
Capacity calibration request message (or SOH estimations message) is received, then carries out SOH calibration；It is carried out just if not receiving the request
Often charging.
In a step 102, it if charging pile returns to the message for executing battery pack SOH detections, discharges battery pack, Zhi Dao electricity
The voltage of Chi Bao reaches electric discharge by voltage.
In step 103, charging instruction is sent to charging pile, makes charging pile start to charge to battery pack, until battery pack
Voltage reach charging by voltage.
At step 104, halt instruction is sent to charging pile, makes charging pile stop charging to battery pack, detects battery pack
Charging capacity.
In step 105, according to the charging capacity and predetermined volumes error of charging pile return, judge that the charging detected is held
Whether amount is effective.
In step 106, if the charging capacity detected is effective, battery pack is calculated according to the charging capacity detected
SOH value.
In some embodiments, if the charging capacity detected is effective, the calculating behaviour of the SOH of battery pack can be exited
Make, into charging normal flow.
According to an embodiment of the invention, it is to carry out battery pack SOC calibration by charging pile, BMS can be sent to charging pile
The request of battery pack SOH detections discharges to battery pack if charging pile returns to the message for executing battery pack SOH detections, Zhi Dao electricity
The voltage of Chi Bao reaches electric discharge by voltage；Then charging instruction is sent to charging pile, charging pile is made to start to charge to battery pack,
Until the voltage of battery pack reaches charging by voltage；Then halt instruction is sent to charging pile, charging pile is made to stop to battery
Packet charging, detects the charging capacity of battery pack；Finally according to the charging capacity and predetermined volumes error of charging pile return, judge to examine
Whether the charging capacity measured is effective, if the charging capacity detected is effective, battery is calculated according to the charging capacity detected
The SOH value of packet.
As noted previously, as the battery pack SOC detection methods in the embodiment of the present invention can be filled according to what charging pile returned
Capacitance and predetermined volumes error judge whether the charging capacity detected is effective, only when the charging capacity detected is effective
When, just the SOH value of battery pack can be calculated according to the charging capacity detected, therefore can avoid being missed by sampling precision, time
The influence of the factors such as difference and return loss, so as to improve the SOH accuracy of detection of battery pack.
Further, since the battery pack SOC detection methods in the embodiment of the present invention are substantially that SOH is added in charging process
Detection, does not interfere with normal driving, and user is acceptant.Further, it uses, SOH can also be examined for convenience of client
Link is surveyed as apolegamy part so that user can independently select, you can to execute SOH detections, SOH detections can also be skipped
Link is directly entered charging link.
In addition, due under normal conditions, for electricity under stopping after vehicle is driven a vehicle, entire car controller VCU and BMS
It can be stopped, no suitable chance carries out volume test, causes SOH detection cycles long, and update in general 3~6 months is primary.It adopts
With the SOH detection methods according to an embodiment of the invention, user can be not limited to vehicle operational process, can insert at night
Rifle charges, early up train, and SOH detections are carried out using the charging time, so set, be not only consistent with the use habit of client,
And greatly shorten SOH detection cycles, that is, the quick update of SOH data is realized, so as to ensure the peace of electric vehicle
Full traveling.
According to an embodiment of the invention, if charging pile returns to the message for not executing battery pack SOH detections or charging pile not
Any message detected about SOH is returned, then so that charging pile is charged normal battery pack.
Specifically, it can judge whether the charging capacity detected is effective according to following manner：
(1) the charging capacity Q returned is calculatedFWith the charging capacity Q detectedCBetween difference absolute value | QF-QC|；
(2) absolute value is calculated | QF-QC| and the charging capacity Q detectedCBetween ratio：|QF-QC|/QC；
(3) if ratio | QF-QC|/QCLess than predetermined volumes error a, then judge that the charging capacity detected is effective；If ratio
|QF-QC|/QCMore than or equal to predetermined volumes error a, then judge that the charging capacity detected is invalid.
By taking predetermined volumes error is 2% as an example, if ratio | QF-QC|/QC<2%, then the charging capacity detected is effective, root
According to the charging capacity Q detectedCCalculate the SOH value of battery pack；If | QF-QC|/QC>=2%, then give up and exits this SOH value
It must estimate, into charging normal flow.
Fig. 2 is the flow diagram for the battery pack SOC detection methods that second embodiment of the invention provides.Fig. 2 and Fig. 1 are not
It is with place, further includes the step 107 in Fig. 3 between step 102 in Fig. 1 and 103；And step 104 tool in Fig. 1
Body includes step 1041 in Fig. 2 to 1043.
In step 107, so that battery pack is stood scheduled duration makes battery pack after the full electric discharge for having executed battery pack
After static scheduled duration (for example, 30min), so that battery pack electric discharge is complete, then sends charging instruction to charging pile, to improve
The charge rate of battery pack.
In step 1041, halt instruction is sent to charging pile, charging pile is made to stop charging to battery pack.
In step 1042, judge whether the charging current of battery pack is reduced to predetermined value (such as 0.05C).
In step 1043, if whether the charging current of battery pack is reduced to predetermined value, the charging for detecting battery pack is held
Amount, to improve the accuracy of detection of the charging capacity of battery pack.
Fig. 3 is the flow diagram for the battery pack SOC detection methods that third embodiment of the invention provides.Shown in Fig. 3
Step includes 301 to step 304, is used for charging pile.
In step 301, the request for the battery pack SOH detections that BMS is sent is received.
In step 302, according to user's detection demand, the message for whether executing battery pack SOH and detecting is returned to BMS.
In step 303, in response to the charging instruction of BMS, start to charge to battery pack.
In step 304, in response to the halt instruction of BMS, stop charging to battery pack, and charging capacity is returned to BMS,
To be verified to the battery inclusion quantity detected.
Fig. 4 is the flow diagram for the battery pack SOC detection methods that fourth embodiment of the invention provides, and is used for battery pack
SOH detecting systems, battery pack SOH detecting systems include BMS and charging pile, and Fig. 4 is the interaction schematic diagram in Fig. 1 and Fig. 3, figure
Step shown in 4 includes step 401 to step 407.
In step 401, BMS sends the request that battery pack SOH is detected to charging pile.
In step 402, charging pile receives the request for the battery pack SOH detections that BMS is sent.
In step 403, according to user's detection demand, charging pile returns to whether execute disappearing for battery pack SOH detections to BMS
Breath.
In step 404, if charging pile returns to the message for executing battery pack SOH detections, BMS discharges to battery pack, directly
Voltage to battery pack reaches electric discharge by voltage.
In step 405, BMS sends charging instruction to charging pile.
In a step 406, in response to charging instruction, charging pile starts to charge to battery pack, until the voltage of battery pack reaches
To charging by voltage.
In step 407, BMS sends halt instruction to charging pile.
In a step 408, in response to halt instruction, charging pile stops charging to battery pack, and returns to charging to BMS and hold
Amount.
In step 409, BMS detects the charging capacity of battery pack.
In step 410, the charging capacity and predetermined volumes error that BMS is returned according to charging pile, judge to detect fills
Whether capacitance is effective.
In step 411, if the charging capacity detected is effective, BMS calculates battery according to the charging capacity detected
The SOH value of packet.
Fig. 5 is the flow diagram of battery pack SOC detection methods that fifth embodiment of the invention provides, shown in Fig. 5
Step 501 includes step 516, in order to it is further understood that technical solution in the embodiment of the present invention.
In step 501, the plug in rifle in charging pile is connect with battery pack.
In step 502, BMS sends SOH detection requests to charging pile.
In some embodiments, SOH detection instructions can be sent manually by user and (please refer to step 5021).
In further embodiments, SOH detection instructions can also independently be sent based on self study by charging pile and (please refers to step
It is rapid 5022).
In step 503, judge whether charging pile executes SOH detection instructions.If charging pile executes SOH detection instructions,
Execute step 504；If charging pile does not execute SOH detection instructions, 505 and step 506 are thened follow the steps.
In step 504, message OxAA is replied.
In step 505, message Ox00 is replied.
In step 506, it executes and charges normal flow.
In step 507, judge whether BMS receives the message of charging pile reply, and message content is OxAA.If BMS
The message of charging pile reply is received, and message content is OxAA, thens follow the steps 508；Otherwise, step 506 is executed.
In step 508, battery pack is expired and is discharged to by voltage.
In step 509, battery pack is made to stand 30min.
In step 510, battery pack is made to charge to 3.65V.
In step 511, judge whether the charging current of battery pack is reduced to 0.05C.If the charging current of battery pack drops
Down to 0.05C, 512 and step 513 are thened follow the steps.
In step 512, the charging capacity of battery pack is detected.
In step 513, the discharge capacity of battery pack is returned
In the step 514, judge whether the difference between the charging capacity detected and the charging capacity of return is less than inspection
The 2% of the charging capacity measured.Difference between the charging capacity of the charging capacity and return that detect is filled less than what is detected
The 2% of capacitance, thens follow the steps 515, no to then follow the steps 516.
In step 515, the SOH value of battery pack is calculated using the charging capacity detected.
In step 516, the calculating of battery pack SOH value is abandoned.
Fig. 6 is the structural schematic diagram of battery management system provided in an embodiment of the present invention, and battery management system BMS includes
First sending module 601, discharge module 602, the first charging module 603, the first stopping modular 604, judgment module 605 and calculating
Module 606.
Wherein, the first sending module 601 is used to send the request that battery pack SOH is detected to charging pile.
If discharge module 602 returns to the message for executing battery pack SOH detections for charging pile, discharge battery pack, directly
Voltage to battery pack reaches electric discharge by voltage.
First charging module 603 is used to send charging instruction to charging pile, and charging pile is made to start to charge to battery pack, until
The voltage of battery pack reaches charging by voltage.
First stopping modular 604 is used to send halt instruction to charging pile, makes charging pile stop charging to battery pack, detection
The charging capacity of battery pack.
The charging capacity and predetermined volumes error that judgment module 605 is used to be returned according to charging pile, judge to detect fills
Whether capacitance is effective.
Specifically, judgment module 605 (does not show including the first computing unit, the second computing unit and judging unit in figure
Go out).Wherein, the absolute value of the difference between charging capacity of first computing unit for calculating discharge capacity and detecting；The
Ratio between charging capacity of two computing units for calculating absolute value and detecting；If judging unit be less than for ratio or
Person is equal to predetermined volumes error, then judges that the charging capacity detected is effective；If ratio is more than predetermined volumes error, judge to examine
The charging capacity measured is invalid.
If the charging capacity that computing module 606 is used to detect is effective, battery is calculated according to the charging capacity detected
The SOH value of packet.
Fig. 7 is the structural schematic diagram of charging pile provided in an embodiment of the present invention, which includes receiving module 701, the
Two sending modules 702, the second charging module 703 and the second stopping modular 704.
Wherein, receiving module 701 is used to receive the request of the battery pack SOH detections of BMS transmissions.
Second sending module 702 is used to, according to user's detection demand, return to BMS and whether execute what battery pack SOH was detected
Message.
Second charging module 703 is used for the charging instruction in response to BMS, starts to charge to battery pack.
Second stopping modular 704 is used for the halt instruction in response to BMS, stops charging to battery pack, and is filled to BMS returns
Capacitance.
The embodiment of the present invention also provides a kind of battery pack SOH detecting systems, which includes as shown in Figure 6
Battery management system BMS and charging pile as shown in Figure 7.
It should be clear that each embodiment in this specification is described in a progressive manner, each embodiment it
Between just to refer each other for same or analogous part, the highlights of each of the examples are it is different from other embodiment it
Place.For device embodiments, related place may refer to the declaratives of embodiment of the method.Not office of the embodiment of the present invention
It is limited to particular step and structure described above and shown in figure.Those skilled in the art can understand the present invention in fact
It after the spirit for applying example, is variously modified, modification and addition, or the sequence between changing the step.Also, it is risen in order to concise
See, omits the detailed description to known method technology here.
Functional block shown in structures described above block diagram can be implemented as hardware, software, firmware or their group
It closes.When realizing in hardware, it may, for example, be electronic circuit, application-specific integrated circuit (ASIC), firmware appropriate, insert
Part, function card etc..When being realized with software mode, the element of the embodiment of the present invention is used to execute the program of required task
Or code segment.Either code segment can be stored in machine readable media program or the data by being carried in carrier wave are believed
It number is sent in transmission medium or communication links." machine readable media " may include be capable of storage or transmission information any
Medium.The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM
(EROM), floppy disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can via such as because
The computer network of special net, Intranet etc. is downloaded.
The embodiment of the present invention can be realized in other specific forms, without departing from its spirit and essential characteristics.For example, special
Determine the algorithm described in embodiment to be changed, and system architecture is without departing from the substantially smart of the embodiment of the present invention
God.Therefore, current embodiment is all counted as being exemplary rather than limited, the model of the embodiment of the present invention in all respects
It encloses and is defined by appended claims rather than foregoing description, also, fall into the meaning of claim and complete in the range of equivalent
Portion changes all to be included among the range of the embodiment of the present invention.
Claims (10)
1. a kind of battery pack SOH detection methods are used for battery management system BMS, which is characterized in that including：
The request that battery pack SOH is detected is sent to charging pile；
If the charging pile returns to the message for executing the battery pack SOH detections, discharge the battery pack, until the electricity
The voltage of Chi Bao reaches electric discharge by voltage；
Charging instruction is sent to the charging pile, makes the charging pile start to charge to the battery pack, until the battery pack
Voltage reach charging by voltage；
Halt instruction is sent to the charging pile, makes the charging pile stop charging to the battery pack, detects the battery pack
Charging capacity；
The charging capacity and predetermined volumes error returned according to the charging pile, judges whether the charging capacity detected is effective；
If the charging capacity detected is effective, the charging capacity detected according to calculates the SOH of the battery pack
Value.
2. according to the method described in claim 1, it is characterized in that, the method further includes：
If the charging pile returns to the message for not executing the battery pack SOH detections or the charging pile does not return to any pass
In the message of SOH detections, then the charging pile is made to charge normal battery pack.
3. according to the method described in claim 1, it is characterized in that, the charging capacity returned according to the charging pile and pre-
Constant volume error judges whether the charging capacity detected is effective, including：
Calculate the absolute value of the difference between the charging capacity of the return and the charging capacity detected；
Calculate the ratio between the absolute value and the charging capacity detected；
If the ratio is less than the predetermined volumes error, judge that the charging capacity detected is effective；
If the ratio no less than the predetermined volumes error, judges that the charging capacity detected is invalid.
4. if according to the method described in claim 1, execute the battery pack it is characterized in that, being returned in the charging pile
The message of SOH detections, then discharge to the battery pack, until the voltage of the battery pack reaches electric discharge by voltage and described
To between charging pile transmission charging instruction, the method further includes：
The battery pack is set to stand scheduled duration.
5. according to the method described in claim 1, it is characterized in that, described send halt instruction to the charging pile, make described
Charging pile stops charging to the battery pack, detects the charging capacity of the battery pack, including：
Halt instruction is sent to the charging pile, the charging pile is made to stop charging to the battery pack；
Judge whether the charging current of the battery pack is reduced to predetermined value；
If the charging current of the battery pack is reduced to the predetermined value, the charging capacity of the battery pack is detected.
6. a kind of battery pack SOH detection methods are used for battery pack SOH detecting systems, which is characterized in that including：
BMS sends the request that battery pack SOH is detected to charging pile；
Charging pile receives the request for the battery pack SOH detections that the BMS is sent；
If the charging pile returns to the message for executing the battery pack SOH detections, the BMS discharges to the battery pack, directly
Voltage to the battery pack reaches electric discharge by voltage；
The BMS sends charging instruction to the charging pile, and in response to the charging instruction, the charging pile starts to the electricity
Chi Bao charges, until the voltage of the battery pack reaches charging by voltage；
The BMS sends halt instruction to the charging pile, and in response to the halt instruction, the charging pile stops to the electricity
Chi Bao charges, and detects the charging capacity of the battery pack；
The charging capacity and predetermined volumes error that the BMS is returned according to the charging pile, judge that the charging capacity detected is
It is no effective；
If the charging capacity detected is effective, the charging capacity that the BMS is detected according to calculates the battery
The SOH value of packet.
7. a kind of battery management system, which is characterized in that including：
First sending module, for sending the request that battery pack SOH is detected to charging pile；
Discharge module puts the battery pack if returning to the message for executing the battery pack SOH detections for the charging pile
Electricity, until the voltage of the battery pack reaches electric discharge by voltage；
First charging module makes the charging pile start to fill the battery pack for sending charging instruction to the charging pile
Electricity, until the voltage of the battery pack reaches charging by voltage；
First stopping modular makes the charging pile stopping fill the battery pack for sending halt instruction to the charging pile
Electricity detects the charging capacity of the battery pack；
Judgment module, the charging capacity for being returned according to the charging pile and predetermined volumes error, judge the charging detected
Whether capacity is effective；
Computing module, if effective for the charging capacity detected, the charging capacity detected according to calculates institute
State the SOH value of battery pack.
8. battery management system according to claim 7, which is characterized in that the judgment module includes：
First computing unit, the difference between charging capacity and the charging capacity detected for calculating the return
Absolute value；
Second computing unit, for calculating the ratio between the absolute value and the charging capacity detected；
Judging unit judges that the charging capacity detected is effective if being less than the predetermined volumes error for the ratio；If
The ratio then judges that the charging capacity detected is invalid no less than the predetermined volumes error.
9. a kind of charging pile, which is characterized in that including：
Receiving module, the request of the battery pack SOH detections for receiving BMS transmissions；
Second sending module, for according to user's detection demand, the battery pack SOH detections whether to be executed to BMS returns
Message；
Second charging module starts to charge to the battery pack for the charging instruction in response to the BMS；
Second stopping modular stops charging to the battery pack, and to the BMS for the halt instruction in response to the BMS
Return to charging capacity.
10. a kind of battery pack SOH detecting systems, which is characterized in that including：Battery management system described in claim 7 or 8 and
Charging pile described in claim 9.
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