CN107102269A - Method, device, server and system for measuring battery capacity - Google Patents
Method, device, server and system for measuring battery capacity Download PDFInfo
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- CN107102269A CN107102269A CN201710286625.2A CN201710286625A CN107102269A CN 107102269 A CN107102269 A CN 107102269A CN 201710286625 A CN201710286625 A CN 201710286625A CN 107102269 A CN107102269 A CN 107102269A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000007599 discharging Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims description 31
- 230000005611 electricity Effects 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
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- 210000004027 cell Anatomy 0.000 description 22
- 238000003860 storage Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000205 computational method Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- Tests Of Electric Status Of Batteries (AREA)
Abstract
The invention provides a method, a device, a server and a system for measuring battery capacity. The method comprises the following steps: acquiring battery charging data sent by a battery management system; acquiring the charging capacity of the battery according to the charging data of the battery; the battery charging capacity is used for representing the electric quantity charged into the battery in a charging process; and obtaining the actual battery capacity in the current state according to the battery charging data, the battery charging capacity and the corresponding relation between the battery charge state and the open-circuit voltage. According to the method and the device, the charging capacity of the battery is obtained through the acquired charging data of the battery, the actual battery capacity of the battery in the current state is finally obtained according to the charging data of the battery, the charging capacity and the corresponding relation between the state of charge of the battery and the open-circuit voltage, the accuracy of battery capacity prediction is improved, the battery capacity and the charging and discharging performance can be accurately predicted, and the overcharge and overdischarge of the battery are avoided.
Description
Technical field
The present invention relates to technical field of battery management, more particularly to a kind of measuring method of battery capacity, device, service
Device and system.
Background technology
In face of increasingly severe energy and environment problem, energy-conservation just turns into the focus of current research with new-energy automobile.Hair
Exhibition energy-conservation and new-energy automobile, the pure electric automobile especially with no pollution, zero-emission, to realize Global Sustainable Development,
Protect earth environment for the survival of mankind significant.
Currently the electric automobile using electrokinetic cell as power gradually grows up.Electric automobile refer to using vehicle power as
Power, the automobile travelled with power wheel.And electrokinetic cell is usually the critical energy of electric automobile.
With the long-term use of electrokinetic cell, electrokinetic cell is after multiple discharge and recharge, the decay of battery capacity, battery
The problem of the becoming inevitable that die down of charging and discharging capabilities.Influenceing the principal element of the decay of battery capacity includes：Battery fills
Discharge cycles number of times, charge-discharge magnification, temperature, battery core are consistent etc..Nonlinearity characteristic is presented in the chemical characteristic of battery, it is difficult to
The capacity and charge-discharge performance of battery are predicted by setting up the method for model.
It is existing prediction cell decay method all can not be exactly prediction battery decay and decay after battery charge and discharge
Electric energy power, causes battery often to be crossed and puts, frequently occur the situation of vehicle remaining mileage bust.
The content of the invention
It is an object of the invention to provide a kind of measuring method of battery capacity, device, server and system, so as to
The problem of solving that the battery charging and discharging ability after cell decay and decay can not be predicted exactly in the prior art.
To achieve these goals, the measuring method of a kind of battery capacity provided in an embodiment of the present invention, including：
Obtain the battery charge data that battery management system is sent；
According to the battery charge data, battery charge capacity is obtained, the battery charge capacity is used to represent once to fill
The electricity of battery is filled with electric process；
It is corresponding with open-circuit voltage according to the battery charge data, the battery charge capacity and battery charge state
Relation, obtains the actual battery capacity under current state.
Wherein, methods described also includes：
The actual battery capacity is sent to the battery management system, so that the battery management system is more described
The difference of actual battery capacity and default battery nominal capacity, and when the difference is more than predetermined threshold value, to battery capacity with
And the performance parameter of sign battery charging and discharging ability is modified.
Wherein, the battery charge data includes：Battery charge and charging interval；
It is described according to the battery charge data, the step of obtaining battery charge capacity, including：
According to the battery charge and the charging interval, battery charge capacity is obtained by integrating summation algorithm.
Wherein, the battery charge data includes：Initial voltage V before battery chargingintFinal electricity after being charged with battery
Press Vfina；
It is corresponding with open-circuit voltage according to the battery charge data, the battery charge capacity and battery charge state
Relation, the step of obtaining the actual battery capacity under current state includes：
According to the initial voltage Vint, the final voltage VfinaAnd the battery charge state and open-circuit voltage
Corresponding relation, respectively obtains the initial state-of-charge SOC of batteryintAnd the final state-of-charge SOC of batteryfina；
According to C/ (SOCfina-SOCint), obtain the actual battery capacity under current state.
Wherein, the battery charge data includes：Battery temperature；
It is corresponding with open-circuit voltage according to the battery charge data, the battery charge capacity and battery charge state
After relation, the step of obtaining the actual battery capacity under current state, methods described also includes：
Whether judge the battery temperature is default battery temperature；
If it is not, then using the default battery temperature as normative reference, returning to the actual battery capacity under current state
One changes amendment, obtains the actual battery capacity under the default battery temperature.
The embodiment of the present invention also provides a kind of measurement apparatus of battery capacity, including：
First acquisition module, the battery charge data for obtaining battery management system transmission；
Second acquisition module, for according to the battery charge data, obtaining battery charge capacity, the battery charging is held
Measure the electricity for being filled with battery in charging process of expression；
Cubic content measurement module, for according to the battery charge data, the battery charge capacity and battery charge shape
The corresponding relation of state and open-circuit voltage, obtains the actual battery capacity under current state.
Wherein, the measurement apparatus also includes：
Sending module, for the actual battery capacity to be sent to the battery management system, so that the cell tube
The difference of actual battery capacity and default battery nominal capacity described in systematic comparison is managed, and is more than predetermined threshold value in the difference
When, battery capacity and the performance parameter for characterizing battery charging and discharging ability are modified.
Wherein, the battery charge data includes：Battery charge and charging interval；
Second acquisition module specifically for：According to the battery charge and the charging interval, pass through integration
Summation algorithm obtains battery charge capacity.
Wherein, the battery charge data includes：Initial voltage V before battery chargingintFinal electricity after being charged with battery
Press Vfina；
The cubic content measurement module specifically for：According to the initial voltage Vint, the final voltage VfinaAnd it is described
The corresponding relation of battery charge state and open-circuit voltage, respectively obtains the initial state-of-charge SOC of batteryintAnd battery is most
Whole state-of-charge SOCfina；
According to C/ (SOCfina-SOCint), obtain the actual battery capacity under current state.
Wherein, the battery charge data includes：Battery temperature；
The measurement apparatus of the battery capacity also includes：
Judge module, for according to the battery charge data, the battery charge capacity and battery charge state
With the corresponding relation of open-circuit voltage, after obtaining the actual battery capacity under current state, judge the battery temperature whether be
Default battery temperature；
Correcting module, for when the battery temperature is not the default battery temperature, with the default battery temperature
For normative reference, amendment is normalized to the actual battery capacity under current state, obtained under the default battery temperature
Actual battery capacity.
The embodiment of the present invention also provides a kind of server, including：The measurement apparatus of battery capacity as described above.
The embodiment of the present invention also provides a kind of measuring system of battery capacity, including：
Server as described above；
Electric automobile, the electric automobile includes battery management system, and the battery management system leads to the server
Letter connection；
Wherein, the battery management system is used to send battery charge data to the server, and by the institute received
The difference of the actual battery capacity and default battery nominal capacity of server transmission is stated, and is more than predetermined threshold value in the difference
When, battery capacity and the performance parameter for characterizing battery charging and discharging ability are modified.
The above-mentioned technical proposal of the present invention has the beneficial effect that：
In the such scheme of the embodiment of the present invention, by the battery charge data got, battery charge capacity is obtained, and
According to battery charge data, charging capacitor and battery charge state and the corresponding relation of open-circuit voltage, finally obtain battery and exist
Actual battery capacity under current state, improves the precision of apparatus for battery capacity measurement, and prediction battery capacity exactly can be achieved and fills
Discharge performance, it is to avoid over-charging of battery, which is crossed, to be put.
Brief description of the drawings
Fig. 1 is one of flow chart of measuring method of battery capacity of the embodiment of the present invention；
Fig. 2 is the corresponding relation schematic diagram of battery charge state and open-circuit voltage under normal temperature；
Fig. 3 is the two of the flow chart of the measuring method of the battery capacity of the embodiment of the present invention；
Fig. 4 is the idiographic flow schematic diagram of step 103 in Fig. 1；
Fig. 5 is the three of the flow chart of the measuring method of the battery capacity of the embodiment of the present invention；
Fig. 6 is the four of the flow chart of the measuring method of the battery capacity of the embodiment of the present invention；
Fig. 7 constitutes structural representation for the measurement apparatus of the battery capacity of the embodiment of the present invention.
Embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
As shown in figure 1, one of flow chart of measuring method of battery capacity for the embodiment of the present invention.Tool should be schemed below
Body illustrates the embodiment process of this method.
Step 101, the battery charge data that battery management system is sent is obtained；
Here, battery refers specifically to the battery modules in electric automobile, and battery modules include：Multiple battery cells.
When battery charge initiation, battery management system (Battery Management System, BMS) sends battery
Charge data.
Battery charge data includes：Initial voltage V before battery chargingint, battery charging after final voltage Vfina, fill
Battery charge, charging interval, battery temperature in electric process etc..
Step 102, according to the battery charge data, battery charge capacity is obtained, the battery charge capacity is used for table
Show the electricity that battery is filled with a charging process；
Step 103, according to the battery charge data, the battery charge capacity and battery charge state and open circuit electricity
The corresponding relation of pressure, obtains the actual battery capacity under current state.
Specifically, according to the battery charge data, the battery charge capacity and pre-recorded battery charge shape
The corresponding relation of state and open-circuit voltage, obtains the actual battery capacity under current state.
It is stored in that is, the corresponding relation of battery charge state and open-circuit voltage is pre-recorded in server.
Here, battery charge state (Stage of Charge, SOC) is also referred to as battery dump energy, for representing that battery makes
With a period of time or it is long-term lie idle after residual capacity and the ratio of the capacity of its fully charged state, commonly use percentage table
Show.
Here, the span of battery charge state is 0~1.As SOC=0, represent that battery discharge is complete；Work as SOC=
When 1, represent that battery is fully charged.
As shown in Fig. 2 being battery charge state and the relation curve schematic diagram of open-circuit voltage.Abscissa represents battery charge
State, is represented with percentage；Ordinate represents monomer battery voltage, and unit is volt V.
Here, battery open circuit voltage (Open Circuit Voltage, OCV) is state-of-charge SOC function.Due to opening
Road voltage is the reaction of inside battery electrochemical equilibrium state, is not changed with time, battery aging status, therefore the present invention is implemented
Example calculates the actual battery capacity of battery according to battery open circuit voltage and this constant corresponding relation of state-of-charge.
The measuring method of battery capacity provided in an embodiment of the present invention, by the battery charge data got, obtains electricity
Pond charging capacity, and according to battery charge data, charging capacitor and battery charge state and the corresponding relation of open-circuit voltage, most
Actual battery capacity of the battery under current state is obtained afterwards, the precision of apparatus for battery capacity measurement is improved, and can be achieved to predict exactly
Battery capacity and charge-discharge performance, it is to avoid over-charging of battery, which is crossed, to be put.
Specifically, as shown in figure 3, in the embodiment of the present invention battery capacity measuring method, may also include：
Step 104, the actual battery capacity is sent to the battery management system, so that the battery management system
Compare the difference of the actual battery capacity and default battery nominal capacity, and when the difference is more than predetermined threshold value, to electricity
The performance parameter of tankage and sign battery charging and discharging ability is modified.
Here, it is battery capacity when battery is not decayed to preset battery nominal capacity.
Here, the amendment to battery capacity specifically refers to update default battery nominal capacity, is updated to actual battery capacity.
The performance parameter amendment for characterizing battery charging and discharging ability is specifically referred to performance parameter value being changed to actual battery
Corresponding performance parameter value under capacity.
It should be noted that the executive agent of the inventive method is server.Wherein, the server storage has the battery full longevity
Order charge data.Including：The corresponding performance parameter for characterizing battery charging and discharging ability under different battery capacities.
Generally, when battery capacity decays to the 20% of galvanic cell capacity, then battery life termination is judged.
Here, the performance parameter to battery capacity and sign battery charging and discharging ability is modified, and can be prevented effectively from electricity
Pond super-charge super-discharge, it is to avoid or reduce the situation for vehicle remaining mileage bust occur.
Specifically, the battery charge data includes：Battery charge and charging interval.
Here, step 102 also may particularly include：
According to the battery charge and the charging interval, battery charge capacity is obtained by integrating summation algorithm.
It should be noted that, when battery charges, obtain battery charge ItWith charging interval t, calculated by integrating summation
Method, i.e. ∑ It* dt, obtains battery charge capacity C.
Here, charging interval t refers to once charging and started to the time terminated.
Specifically, the battery charge data includes：Initial voltage V before battery chargingintIt is final after being charged with battery
Voltage Vfina；Here, as shown in figure 4, step 103 also may particularly include：
Step 1031, according to the initial voltage Vint, the final voltage VfinaAnd the battery charge state is with opening
The corresponding relation of road voltage, respectively obtains the initial state-of-charge SOC of batteryintAnd the final state-of-charge SOC of batteryfina；
Here, it is preferred that, in the embodiment of the present invention, the corresponding relation of battery charge state and open-circuit voltage is in a tabular form
Storage.
With reference to Fig. 2, according to initial voltage VintWith final voltage Vfina, table look-up and obtain the initial charged shape of corresponding battery
State SOCintAnd the final state-of-charge SOC of batteryfina。
Need exist for explanation, the initial voltage V before battery chargingint, for the average voltage of cell before charging；
Final voltage V after battery chargingfina, terminate the average voltage of rear cell for charging.
Here, battery charge data may also include：The voltage and the first total voltage of cell before battery charging, and
Battery charging terminate after cell voltage and the second total voltage.
The average voltage of cell, i.e. initial voltage V before chargingint, the electricity of the cell before being charged by battery
Pressure and the first total voltage, which are calculated, to be obtained；
The average voltage of cell after charging, i.e., final voltage Vfina, can be charged the electricity of the monomer after terminating by battery
The voltage in pond and the second total voltage, which are calculated, to be obtained.
Step 1032, according to C/ (SOCfina-SOCint), obtain the actual battery capacity under current state.
This is arrived, the measuring method of the battery capacity in above-described embodiment is applied to battery and charged this charging ring in electrical changing station
Carried out under border.
Here, electric automobile uses fast changing battery, and the supplement of electric automobile electricity can be completed within a short period of time, is replaced
Battery charging stand on be easily maintained under specified temp (25 DEG C or so), charged by standard charging current.Therefore, electricity is changed
Battery (battery being replaced) charging environment and charging curve meet battery electric quantity measurement request.
Specifically, battery charge data includes：Battery temperature.
If battery is not in electrical changing station and charged under this charging environment, but is in the range of a certain temperature, adopt
With under the charging environment of vehicle-mounted trickle charge, in addition to performing above-mentioned steps, according to the battery charge data, battery charging
The corresponding relation of capacity and battery charge state and open-circuit voltage, the step of obtaining the actual battery capacity under current state it
Afterwards, as shown in figure 5, the measuring method of the battery capacity of the embodiment of the present invention may also include：
Step 105, whether judge the battery temperature is default battery temperature；
If so, then performing step 104；Conversely, then performing step 106.
It should be noted that default battery temperature is specified temp described above.Usually, it is normal to preset battery temperature
Temperature, value is 25 DEG C.
Step 106, if it is not, then using the default battery temperature as normative reference, holding to the actual battery under current state
Amendment is normalized in amount, obtains the actual battery capacity under the default battery temperature.
It should be noted that reached after step 106 step 104 when, actual battery capacity is default battery temperature
Under actual battery capacity.
It should be noted that temperature influences very big to battery capacity, battery capacity is increased with increased temperature.In battery temperature
When degree is not under default battery temperature, the actual battery that the actual battery capacity under obtained current state is not battery is calculated
Capacity is, it is necessary to normalize under default battery temperature, and obtained battery capacity is only accurate actual battery capacity.
The measuring method of battery capacity provided in an embodiment of the present invention, by the battery charge data got, obtains electricity
Pond charging capacity, and according to battery charge data, charging capacitor and battery charge state and the corresponding relation of open-circuit voltage, most
Actual battery capacity of the battery under current state is obtained afterwards, the precision of apparatus for battery capacity measurement is improved, and can be achieved to predict exactly
Battery capacity and charge-discharge performance, it is to avoid over-charging of battery, which is crossed, to be put.
As shown in fig. 6, the particular flow sheet of the measuring method of the battery capacity provided for further embodiment of this invention.Below
The implementation process of the measuring method of battery capacity is illustrated with reference to the figure.
Step 201, battery cell average voltage V before charging is readint, battery mean temperature Tint；
Step 202, current charge mode is judged；
If current charge mode is trickle charge pattern, step 203 is performed；If current charge mode is electrical changing station charging mould
Formula, then perform step 211.
Here, charging status signal can be transmitted to server in battery management system；Server is by recognizing that charged state is believed
Number, it is determined that current charge mode.Trickle charge pattern or electrical changing station charge mode when currently charging.
Step 203, charging is started；
Here it should be noted that, after server initiation and state recognition terminate, just start charging, into charging
Journey.
Step 204, battery temperature T, the cell ceiling voltage V of simultaneously storing charge procedure are readmax, battery total voltage
U, battery charge It；
Here, storage cell ceiling voltage VmaxCan be used as charging the one of Rule of judgment whether terminated.
Step 205, using integration method counting cell charging capacity C=∑ It*dt；
Step 206, judge whether charge complete flag position is 1；
Here, if cell ceiling voltage VmaxPreset value is reached, then by charge complete flag position 1.
Certainly, the Rule of judgment that whether charging terminates is not limited only to cell ceiling voltage Vmax, can also be and recognize
Charging gun plug state, charging in battery whether break down, charge whether be full of etc..
If so, then performing step 207；Step 204 is performed conversely, then returning；
Step 207, after record charging terminates, battery average voltage Vfina, battery charge capacity C, battery mean temperature
Tfina；
Here, the battery mean temperature T after charging terminatesfinaAvailable for follow-up temperature normalized with reference to outer, go back
For judging whether battery breaks down, battery charging and discharging Performance Evaluation etc..
Step 208, average voltage V before being charged according to batteryint, charging terminate rear average voltage Vfina, computation of table lookup correspondence
State-of-charge SOCint、SOCfina；
Here, the elaboration of step 1031 part in above-described embodiment is referred to, is repeated no more here.
Step 209, according to capacity window computational methods, temperature is normalized under normal temperature, calculates the capacity under battery normal temperature
Cactu=C/ (SOCfina-SOCint)；
Here, capacity window computational methods are that battery charge state described in above-described embodiment is corresponding with open-circuit voltage
Relation.
Step 210, battery actual capacity is sent to BMS, and battery capacity is sent into mark position to 1；
As illustrated, step 211~step 214 is referred to as step 203~step 206 under trickle charge charge mode
Diagram, is repeated no more here.
Step 215, after record charging terminates, battery average voltage Vfina, battery charge capacity C；
It should be noted that, do not re-record charging here and terminate rear battery mean temperature Tfina, it is mould because electrical changing station charges
It is the charging at a temperature of normal temperature under formula, charge ambient stable.
Step 216 is identical with step 208 execution content, repeats no more here.
Step 217, according to capacity window computational methods, the capacity C under battery normal temperature is calculatedactu=C/ (SOCfina-
SOCint)；
Step 218 is identical with step 210 execution content, repeats no more here.
Here, the embodiment of the present invention calculates the actual appearance under battery normal temperature state by the off-line analysis to charge data
Amount, improves the precision of apparatus for battery capacity measurement, prediction battery capacity and charge-discharge performance exactly can be achieved, it is to avoid over-charging of battery mistake
Put.
The embodiment of the present invention also provides a kind of computer-readable recording medium, is stored thereon with computer program (instruction),
The program (instruction) realizes following steps when being executed by processor：
Obtain the battery charge data that battery management system is sent；
According to the battery charge data, battery charge capacity is obtained, the battery charge capacity is used to represent once to fill
The electricity of battery is filled with electric process；
It is corresponding with open-circuit voltage according to the battery charge data, the battery charge capacity and battery charge state
Relation, obtains the actual battery capacity under current state.
Alternatively, when the program (instruction) is executed by processor, following steps are also performed：
The actual battery capacity is sent to the battery management system, so that the battery management system is more described
The difference of actual battery capacity and default battery nominal capacity, and when the difference is more than predetermined threshold value, to battery capacity with
And the performance parameter of sign battery charging and discharging ability is modified.
Alternatively, the battery charge data includes：Battery charge and charging interval；It is described to be filled according to the battery
Electric data, the step of obtaining battery charge capacity, including：
According to the battery charge and the charging interval, battery charge capacity is obtained by integrating summation algorithm.
Alternatively, the battery charge data includes：Initial voltage V before battery chargingintIt is final after being charged with battery
Voltage Vfina；According to pair of the battery charge data, the battery charge capacity and battery charge state and open-circuit voltage
It should be related to, the step of obtaining the actual battery capacity under current state includes：
According to the initial voltage Vint, the final voltage VfinaAnd the battery charge state and open-circuit voltage
Corresponding relation, respectively obtains the initial state-of-charge SOC of batteryintAnd the final state-of-charge SOC of batteryfina；
According to C/ (SOCfina-SOCint), obtain the actual battery capacity under current state.
Alternatively, the battery charge data includes：Battery temperature；Filled according to the battery charge data, the battery
The corresponding relation of capacitance and battery charge state and open-circuit voltage, the step of obtaining the actual battery capacity under current state
Afterwards, when the program (instruction) is executed by processor, following steps are also performed：
Whether judge the battery temperature is default battery temperature；
If it is not, then using the default battery temperature as normative reference, returning to the actual battery capacity under current state
One changes amendment, obtains the actual battery capacity under the default battery temperature.
Computer-readable medium includes permanent and non-permanent, removable and non-removable media can be by any method
Or technology come realize information store.Information can be computer-readable instruction, data structure, the module of program or other data.
The example of the storage medium of computer includes, but are not limited to phase transition internal memory (PRAM), static RAM (SRAM), moved
State random access memory (DRAM), other kinds of random access memory (RAM), read-only storage (ROM), electric erasable
Programmable read only memory (EEPROM), fast flash memory bank or other memory techniques, read-only optical disc read-only storage (CD-ROM),
Digital versatile disc (DVD) or other optical storages, magnetic cassette tape, the storage of tape magnetic rigid disk or other magnetic storage apparatus
Or any other non-transmission medium, the information that can be accessed by a computing device available for storage.Define, calculate according to herein
Machine computer-readable recording medium does not include temporary computer readable media (transitory media), such as data-signal and carrier wave of modulation.
As shown in fig. 7, the embodiment of the present invention also provides a kind of measurement apparatus of battery capacity, including：
First acquisition module 301, the battery charge data for obtaining battery management system transmission；
Second acquisition module 302, for according to the battery charge data, obtaining battery charge capacity, the battery fills
Capacitance is used for the electricity for representing to be filled with battery in a charging process；
Cubic content measurement module 303, for according to the battery charge data, the battery charge capacity and battery charge
The corresponding relation of state and open-circuit voltage, obtains the actual battery capacity under current state.
Specifically, the measurement apparatus also includes：
Sending module, for the actual battery capacity to be sent to the battery management system, so that the cell tube
The difference of actual battery capacity and default battery nominal capacity described in systematic comparison is managed, and is more than predetermined threshold value in the difference
When, battery capacity and the performance parameter for characterizing battery charging and discharging ability are modified.
Specifically, the battery charge data includes：Battery charge and charging interval；The second acquisition module tool
Body is used for：According to the battery charge and the charging interval, battery charge capacity is obtained by integrating summation algorithm.
Specifically, the battery charge data includes：Initial voltage V before battery chargingintIt is final after being charged with battery
Voltage Vfina；The cubic content measurement module specifically for：According to the initial voltage Vint, the final voltage VfinaAnd it is described
The corresponding relation of battery charge state and open-circuit voltage, respectively obtains the initial state-of-charge SOC of batteryintAnd battery is most
Whole state-of-charge SOCfina；
According to C/ (SOCfina-SOCint), obtain the actual battery capacity under current state.
Specifically, the battery charge data includes：Battery temperature；
The measurement apparatus of the battery capacity also includes：
Judge module, for according to the battery charge data, the battery charge capacity and battery charge state
With the corresponding relation of open-circuit voltage, after obtaining the actual battery capacity under current state, judge the battery temperature whether be
Default battery temperature；
Correcting module, for when the battery temperature is not the default battery temperature, with the default battery temperature
For normative reference, amendment is normalized to the actual battery capacity under current state, obtained under the default battery temperature
Actual battery capacity.
The measurement apparatus for the battery capacity that the present invention is provided, the electricity that the second acquisition module is got by the first acquisition module
Pond charge data, obtains battery charge capacity, cubic content measurement module is according to battery charge data, charging capacitor and battery charge
The corresponding relation of state and open-circuit voltage, finally obtains actual battery capacity of the battery under current state, improves battery capacity
The precision of measurement, can be achieved prediction battery capacity and charge-discharge performance exactly, it is to avoid over-charging of battery, which is crossed, to be put.
The embodiment of the present invention also provides a kind of server, including：The measurement apparatus of battery capacity as described above.
Here, server can be by reading the battery charge data that the battery management system on CAN communication network is transmitted, such as
Monomer battery voltage, battery total voltage, battery charge and temperature, and storage battery charge data.
The embodiment of the present invention also provides a kind of measuring system of battery capacity, including：
Server as described above；
Electric automobile, the electric automobile includes battery management system, and the battery management system leads to the server
Letter connection；
Wherein, the battery management system is used to send battery charge data to the server, and by the institute received
The difference of the actual battery capacity and default battery nominal capacity of server transmission is stated, and is more than predetermined threshold value in the difference
When, battery capacity and the performance parameter for characterizing battery charging and discharging ability are modified.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (12)
1. a kind of measuring method of battery capacity, it is characterised in that including：
Obtain the battery charge data that battery management system is sent；
According to the battery charge data, battery charge capacity is obtained, the battery charge capacity is used to represent once to charge
The electricity of battery is filled with journey；
According to the battery charge data, the battery charge capacity and battery charge state pass corresponding with open-circuit voltage
System, obtains the actual battery capacity under current state.
2. the measuring method of battery capacity according to claim 1, it is characterised in that methods described also includes：
The actual battery capacity is sent to the battery management system, so that the battery management system reality
Battery capacity and the difference of default battery nominal capacity, and when the difference is more than predetermined threshold value, to battery capacity and table
The performance parameter for levying battery charging and discharging ability is modified.
3. the measuring method of battery capacity according to claim 1, it is characterised in that the battery charge data includes：
Battery charge and charging interval；
It is described according to the battery charge data, the step of obtaining battery charge capacity, including：
According to the battery charge and the charging interval, battery charge capacity is obtained by integrating summation algorithm.
4. the measuring method of battery capacity according to claim 1, it is characterised in that the battery charge data includes：
Initial voltage V before battery chargingintFinal voltage V after being charged with batteryfina；
According to the battery charge data, the battery charge capacity and battery charge state pass corresponding with open-circuit voltage
System, the step of obtaining the actual battery capacity under current state includes：
According to the initial voltage Vint, the final voltage VfinaAnd battery charge state pass corresponding with open-circuit voltage
System, respectively obtains the initial state-of-charge SOC of batteryintAnd the final state-of-charge SOC of batteryfina；
According to C/ (SOCfina-SOCint), obtain the actual battery capacity under current state.
5. the measuring method of battery capacity according to claim 1, it is characterised in that the battery charge data includes：
Battery temperature；
According to the battery charge data, the battery charge capacity and battery charge state pass corresponding with open-circuit voltage
After system, the step of obtaining the actual battery capacity under current state, methods described also includes：
Whether judge the battery temperature is default battery temperature；
If it is not, then using the default battery temperature as normative reference, the actual battery capacity under current state is normalized
Amendment, obtains the actual battery capacity under the default battery temperature.
6. a kind of measurement apparatus of battery capacity, it is characterised in that including
First acquisition module, the battery charge data for obtaining battery management system transmission；
Second acquisition module, for according to the battery charge data, obtaining battery charge capacity, the battery charge capacity is used
The electricity of battery is filled with charging process of expression；
Cubic content measurement module, for according to the battery charge data, the battery charge capacity and battery charge state with
The corresponding relation of open-circuit voltage, obtains the actual battery capacity under current state.
7. the measurement apparatus of battery capacity according to claim 6, it is characterised in that the measurement apparatus also includes：
Sending module, for the actual battery capacity to be sent to the battery management system, so that the battery management system
The difference of the system actual battery capacity and default battery nominal capacity, and when the difference is more than predetermined threshold value, it is right
The performance parameter of battery capacity and sign battery charging and discharging ability is modified.
8. the measurement apparatus of battery capacity according to claim 6, it is characterised in that the battery charge data includes：
Battery charge and charging interval；
Second acquisition module specifically for：According to the battery charge and the charging interval, summed by integrating
Algorithm obtains battery charge capacity.
9. the measurement apparatus of battery capacity according to claim 6, it is characterised in that the battery charge data includes：
Initial voltage V before battery chargingintFinal voltage V after being charged with batteryfina；
The cubic content measurement module specifically for：According to the initial voltage Vint, the final voltage VfinaAnd the battery
The corresponding relation of state-of-charge and open-circuit voltage, respectively obtains the initial state-of-charge SOC of batteryintAnd the final lotus of battery
Electricity condition SOCfina；
According to C/ (SOCfina-SOCint), obtain the actual battery capacity under current state.
10. the measurement apparatus of battery capacity according to claim 6, it is characterised in that the battery charge data includes：
Battery temperature；
The measurement apparatus of the battery capacity also includes：
Judge module, for according to the battery charge data, the battery charge capacity and battery charge state with opening
The corresponding relation of road voltage, is obtained after the actual battery capacity under current state, whether judge the battery temperature is default
Battery temperature；
Correcting module, for when the battery temperature is not the default battery temperature, using the default battery temperature as ginseng
Standard is examined, amendment is normalized to the actual battery capacity under current state, the reality under the default battery temperature is obtained
Battery capacity.
11. a kind of server, it is characterised in that including：The measurement dress of battery capacity as described in any one of claim 6~10
Put.
12. a kind of measuring system of battery capacity, it is characterised in that including：
Server as claimed in claim 11；
Electric automobile, the electric automobile includes battery management system, and the battery management system connects with the server communication
Connect；
Wherein, the battery management system is used to send battery charge data to the server, and by the clothes received
The difference of actual battery capacity and default battery nominal capacity that business device is sent, and when the difference is more than predetermined threshold value, it is right
The performance parameter of battery capacity and sign battery charging and discharging ability is modified.
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| CN111239624A (en) * | 2020-02-21 | 2020-06-05 | 中航锂电（洛阳）有限公司 | Battery capacity calibration method and device, electronic equipment and storage medium |
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