CN111490305A - Charging remaining time display method - Google Patents

Charging remaining time display method Download PDF

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Publication number
CN111490305A
CN111490305A CN202010209312.9A CN202010209312A CN111490305A CN 111490305 A CN111490305 A CN 111490305A CN 202010209312 A CN202010209312 A CN 202010209312A CN 111490305 A CN111490305 A CN 111490305A
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charging
time
remaining time
actual
stage
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张扬
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Bordrin Motor China Corp Inc
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Bordrin Motor China Corp Inc
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Priority to CN202010209312.9A priority Critical patent/CN111490305A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to a charging remaining time display method, which comprises the following steps: calculating the total number of the charging initial stage and the secondary charging stage; calculating the actual entering voltage and the actual exiting voltage of the single body in each charging stage; looking up a table to obtain the actual charge entering and the actual charge exiting of the monomer in each charging stage; calculating the charging capacity and the charging estimated time of each charging stage, and obtaining an initial value of the charging remaining time according to the charging estimated time; calculating to obtain the charging remaining time; the display displays the charging remaining time. Compared with the prior art, the method can accurately estimate the initial value of the charging remaining time, eliminate the accumulated estimation error and be compatible with the condition of battery aging.

Description

Charging remaining time display method
Technical Field
The invention relates to the field of new energy automobile battery charging, in particular to a charging remaining time display method.
Background
Along with the continuous development and popularization of new energy automobiles, the demand of a user on the diversification of the charging function is continuously improved, so that the demand is reflected in the functional design fields of charging speed, charging safety and the like, and is also reflected in other more humanized functional design fields of charging reservation, charging remaining time display and the like, and the use feeling of the product can be increased for the user.
Therefore, it is necessary to accurately estimate the remaining charging time, and the estimation of the remaining dc charging time is more complicated than the ac charging in which the charging time is more stable.
The method for estimating the residual time of the direct current charging in the prior art is mostly as follows:
A. calculating the residual charging capacity through the SOC and the battery pack capacity;
B. integrating the real-time charging current and the charging time to obtain real-time charging electric quantity;
C. obtaining the original charging remaining time through the proportional relation between the real-time charging capacity and the remaining charging capacity;
D. and (4) performing some limit and anti-jump processing on the original charging remaining time.
The charging remaining time error estimated by the scheme is larger, because the charging current is step segmented in the direct-current quick charging process, the charging remaining time changes faster and more accurately in the step charging stage with larger charging current, but the charging remaining time is updated more and more slowly and the error with the real time is larger and more along with the reduction of the charging current in the later stage of the charging step. Even if the last output remaining charging time is subjected to the limiting process, the situation where the estimation accuracy differs in different charging stages cannot be improved.
In addition, the estimation error will become larger without considering the aging of the battery.
Disclosure of Invention
The present invention is directed to a method for displaying remaining charging time, which overcomes the above-mentioned drawbacks of the prior art.
The purpose of the invention can be realized by the following technical scheme:
a charging remaining time display method, comprising the steps of:
step S1: after the charging is started, according to the current highest voltage V of the single bodymaxCharging total stage number N and charging current reduction voltage point Ucur[·]Calculating the initial charging stage NsAnd the total number of sub-charging phases Nt；
Step S2: according to the charging start phase NsAnd the total number of sub-charging phases NtCalculating the actual entering voltage V of the single body in each charging stagersnAnd actual exit voltage V of the cellren；
Step S3: according to the actual entering voltage V of the monomerrsnActual exit voltage V of the cellrenAnd an OCV _ SOC table, wherein the actual charging SOC of the monomer in each charging stage is obtained by looking up the tablesnAnd actual discharge of monomer SOCen；
Step S4: according to actual charging SOC of monomersnActual discharge of monomer SOCenAnd battery pack capacity CPtCalculating the charging capacity C of each charging stagePnAnd estimated time of charging TnAnd according to the estimated time T of chargingnObtaining an initial value T of the charging remaining time;
step S5: according to the initial value T of the charging residual time and the charging capacity CPnCalculating to obtain the charging remaining time Tupdate；
Step S6: charging remaining time TupdateIs displayed on the display.
In the step S1, a charge initiation phase N is calculatedsAnd the total number of sub-charging phases NtThe process comprises the following steps:
sequentially judging the current maximum voltage V of the single bodymaxAnd Ucur[·]The relationship of each item is found outmaxIs greater than or equal to U for the first timecur[·]Term U of term valuecur[loop]Then N ist＝N-loop，Ns＝N-Nt+1。
In the step S2, the actual entering voltage V of the cell in each charging stage is calculatedrsnAnd actual exit voltage V of the cellrenThe process comprises the following steps:
for a charging initiation phase Ns，Vrsn＝Vmax，Vren＝Ucur[Ns-1]-Icur[Ns-1]*R，
Remaining phase N for any chargen，VrsnV equal to last charging phaseren，Vren＝Ucur[Nn-1]-Icur[Nn-1]*R，
Wherein, Icur[·]For the charging and current reducing point, R is a single resistor, n represents the nth, and n is loop + 1.
In step S4, the charging capacity C of each charging stage is calculatedPnMeter (2)The calculation formula is as follows:
CPn＝SOCn*CPt
therein, SOCnIs SOCenAnd SOCsnThe difference of (a).
In the step S4, the estimated charging time T is calculatednThe calculation formula of (2) is as follows:
for a charging initiation phase Ns，T0＝CP0/Icur[Ns-1]*60，
Remaining phase N for any chargen，Tn＝CPn/Icur[Nn-1]*60。
In the step S4, the estimated time T is estimated according to the chargingnThe calculation formula for obtaining the initial value T of the charging remaining time is as follows:
T＝T0+T1+…Tn。
the charging remaining time T is calculated in the step S5updateThe process comprises the following steps:
for a charging initiation phase Ns，Tupdate＝T-(I0*t0/3600)/CP0*T0Wherein, I0For the initial charging phase NsActual charging current of t0For the initial charging phase NsThe time of the execution;
if entering the nth charging stage, Tupdate＝T-(Tn-1+…+T0)-(In*tn/3600)/CPn*TnWherein, InIs the actual charging current of the nth charging stage, tnThe time for the nth charging phase to proceed.
Calculating the charging remaining time TupdateIn the process of (2), the charge remaining time is subjected to anti-increase and anti-jump processing.
Compared with the prior art, the invention has the following advantages:
(1) the characteristics of direct-current quick charging step-by-step reduced current charging are fully utilized to estimate the initial value of the charging time and the total charging remaining time of each step charging stage, and the initial value of the charging remaining time can be accurately obtained.
(2) In the process of updating the charging remaining time in real time, the charging remaining time estimation error accumulated in the process of each step charging stage is eliminated by subtracting the charging estimated time of the last step charging stage from the real-time charging remaining time when different step charging stages are reached.
(3) The situation that the charging time is shortened due to battery aging can be compatible by considering the internal resistance R of the battery.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flowchart illustrating the calculation of the initial value of the remaining charging time according to the present invention;
fig. 3 is a flowchart of calculating the remaining charging time according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
The embodiment provides a method for estimating charging remaining time during direct current quick charging, which comprises the following steps:
A. estimating an initial value of the charging remaining time:
1. the direct current fills electric pile and is connected to the vehicle through the rifle that charges, and the start-up of punching the card charges.
2. After charging is started, the battery management system judges the total number of the charging initial stage and the charging stage according to the current highest monomer voltage.
3. After the charging initial stage and the total number of the charging stages are calculated, the actual monomer entering voltage and the actual monomer exiting voltage of each charging stage are calculated according to the entering voltage, the exiting voltage, the internal resistance of the battery and the designed charging current of each charging stage.
After the actual entering voltage and the actual exiting voltage of the single body in each charging stage are calculated, the actual entering voltage and the actual exiting voltage of the single body in each charging stage are calculatedThe actual entering voltage of the single body, the actual exiting voltage of the single body and the OCV _ SOC table in the charging stage are looked up to obtain the actual entering charge SOC of the single body in each charging stagesnActual discharge of monomer SOCenAnd an SOC.
The single body of each charging stage actually enters the charge SOCsnActual discharge of monomer SOCenAnd after the SOC calculation is finished, calculating the charging capacity and the charging estimated time of each stage according to the SOC and the battery pack capacity of each charging stage.
And after the charging estimated time of each charging stage is calculated, sequentially adding the charging estimated time to obtain the initial value of the charging remaining time of the charging process.
B. And (3) updating the charging remaining time in real time:
and in the charging process, calculating the real-time charging capacity according to the actual charging current and the charging time in the current charging stage.
And after the calculation of the real-time charging capacity is completed, calculating the actual charging time according to the real-time charging capacity, the charging capacity of the current charging stage and the estimated charging time of the current charging stage.
And after the actual charging time consumption calculation is completed, subtracting the actual charging time consumption from the initial value of the charging remaining time to obtain the real-time charging remaining time.
And if entering the next charging stage, updating the charging remaining time to the initial value of the charging remaining time minus the estimated charging time and the actual charging time of the charging stage.
In the charging process, the charging remaining time is subjected to increase prevention processing.
And in the charging process, the charging remaining time is subjected to change rate limiting processing.
And if the charging is not finished, continuously updating the charging remaining time in real time, and if the charging is finished, changing the charging remaining time into 0.
C. The remaining charge time is displayed on the display.
Wherein, the step A specifically comprises the following steps:
A1) the direct current fills electric pile and is connected with the vehicle through the rifle that charges to the start charging of punching the card, after the start of charging, get into A2).
A2) According to the current highest voltage V of the single bodymaxN total charging stages and U charging down-flow voltage pointcur[·](array of length N) calculating the initial charge stage NsAnd the total number of sub-charging phases Nt。
a. If Vmax≥Ucur[N-1]Then NsIs N +1, N t0. That is, the charge start voltage is too high, and charging is not necessary.
b. Otherwise, sequentially judging the current highest voltage V of the single bodymaxAnd Ucur[·]The relationship of each item is found outmaxIs greater than or equal to U for the first timecur[·]Term U of term valuecur[loop]Then N ist＝N-loop，Ns＝N-Nt+1, enter a 3).
A3) According to the current highest voltage V of the single bodymax、Ucur[·]、Ns、Nt、Icur[·](array with length N) and battery internal resistance R to calculate actual entering voltage V of single bodyrsnAnd actual exit voltage V of the cellren。
a. For a charging initiation phase Ns，Vrsn＝Vmax，Vren＝Ucur[Ns-1]-Icur[Ns-1]*R。
b. For other phases of charging, VrsnV equal to last charging phaseren，Vren＝Ucur[Nn-1]-Icur[Nn-1]R, wherein Icur[·]For the charging and current-dropping point, R is a single resistor, n represents the nth, and n is loop +1, which enters a 4).
A4) According to V of each charging stagersn、VrenAnd OCV _ SOC table, looking up the table to obtain SOC of each charging stagesn、SOCenAnd SOCnWherein SOC isn＝SOCen-SOCsnEntry a 5);
A5) according to SOC of each charging stagen、Icur[·]、NsAnd battery pack capacity CPtCalculating the charging capacity C of each stagePnCharging and mixing deviceElectric estimated time Tn：
CPn＝SOCn*CPt
For a charging initiation phase Ns，T0＝CP0/Icur[Ns-1]60, rest phases N for any chargen，Tn＝CPn/Icur[Nn-1]60, into a 6).
A6) The initial value T ═ T of charging remaining time0+T1+…TnAnd C, finishing the initialization of the charging remaining time, and entering the step B.
The step B specifically comprises the following steps:
B1) after the charging remaining time initial value T is calculated in the step A, the charging remaining time T is updated in real time according to the T and the actual charging currentupdate：
For a charging initiation phase Ns，Tupdate＝T-(I0*t0/3600)/CP0*T0Wherein, I0For the initial charging phase NsActual charging current of t0For the initial charging phase NsTime of flight, entry B2);
B2) if entering the nth charging stage, Tupdate＝T-(Tn-1+…+T0)-(In*tn/3600)/CPn*TnWherein, InIs the actual charging current of the nth charging stage, tnFor the time the nth charging phase is performed, enter B3);
B3) performing anti-enlargement and anti-jumping treatment in the real-time updating process of the charging remaining time, and entering B4);
B4) judging whether the charging is finished or not, if not, jumping to B1) to continuously update the charging remaining time, and if so, entering B5);
B5) the charging end charging remaining time is updated to 0, and Tupdate is 0.
The method for displaying the charging remaining time of the embodiment has the following advantages:
the characteristics of direct-current quick charging step-by-step reduced current charging are fully utilized to estimate the initial value of the charging time and the total charging remaining time of each step charging stage, so that the initial value of the charging remaining time can be accurately obtained; in the process of updating the charging remaining time in real time, the accumulated charging remaining time estimation error in the process of each step charging stage is eliminated by subtracting the charging estimated time of the last step charging stage from the real-time charging remaining time when different step charging stages are reached; the situation that the charging time is shortened due to battery aging can be compatible by considering the internal resistance R of the battery.

Claims (8)

1. A method for displaying remaining charging time is characterized by comprising the following steps:
step S1: after the charging is started, according to the current highest voltage V of the single bodymaxCharging total stage number N and charging current reduction voltage point Ucur[·]Calculating the initial charging stage NsAnd the total number of sub-charging phases Nt；
Step S2: according to the charging start phase NsAnd the total number of sub-charging phases NtCalculating the actual entering voltage V of the single body in each charging stagersnAnd actual exit voltage V of the cellren；
Step S3: according to the actual entering voltage V of the monomerrsnActual exit voltage V of the cellrenAnd an OCV _ SOC table, wherein the actual charging SOC of the monomer in each charging stage is obtained by looking up the tablesnAnd actual discharge of monomer SOCen；
Step S4: according to actual charging SOC of monomersnActual discharge of monomer SOCenAnd battery pack capacity CPtCalculating the charging capacity C of each charging stagePnAnd estimated time of charging TnAnd according to the estimated time T of chargingnObtaining an initial value T of the charging remaining time;
step S5: according to the initial value T of the charging residual time and the charging capacity CPnCalculating to obtain the charging remaining time Tupdate；
Step S6: charging remaining time TupdateIs displayed on the display.
2. The method as claimed in claim 1, wherein the step S1 of calculating the charge start stage NsAnd the total number of sub-charging phases NtThe process comprises the following steps:
sequentially judging the current maximum voltage V of the single bodymaxAnd Ucur[·]The relationship of each item is found outmaxIs greater than or equal to U for the first timecur[·]Term U of term valuecur[loop]Then N ist＝N-loop，Ns＝N-Nt+1。
3. The charge remaining time display method of claim 2, wherein the step S2 is performed to calculate the actual entering voltage V of each cell in each charging stagersnAnd actual exit voltage V of the cellrenThe process comprises the following steps:
for a charging initiation phase Ns，Vrsn＝Vmax，Vren＝Ucur[Ns-1]-Icur[Ns-1]*R，
Remaining phase N for any chargen，VrsnV equal to last charging phaseren，Vren＝Ucur[Nn-1]-Icur[Nn-1]*R，
Wherein, Icur[·]For the charging and current reducing point, R is a single resistor, n represents the nth, and n is loop + 1.
4. The charge remaining time display method of claim 3, wherein the charge capacity C of each charge stage is calculated in step S4PnThe calculation formula of (2) is as follows:
CPn＝SOCn*CPt
therein, SOCnIs SOCenAnd SOCsnThe difference of (a).
5. The charge remaining time display method of claim 4, wherein the step S4 is executedCalculating estimated charging time TnThe calculation formula of (2) is as follows:
for a charging initiation phase Ns，T0＝CP0/Icur[Ns-1]*60，
Remaining phase N for any chargen，Tn＝CPn/Icur[Nn-1]*60。
6. The method as claimed in claim 1, wherein the step S4 is performed based on the estimated charging time TnThe calculation formula for obtaining the initial value T of the charging remaining time is as follows:
T＝T0+T1+…Tn。
7. the charge remaining time display method of claim 6, wherein the charge remaining time T is calculated in step S5updateThe process comprises the following steps:
for a charging initiation phase Ns，Tupdate＝T-(I0*t0/3600)/CP0*T0Wherein, I0For the initial charging phase NsActual charging current of t0For the initial charging phase NsThe time of the execution;
if entering the nth charging stage, Tupdate＝T-(Tn-1+…+T0)-(In*tn/3600)/CPn*TnWherein, InIs the actual charging current of the nth charging stage, tnThe time for the nth charging phase to proceed.
8. The charge remaining time display method according to claim 1, wherein the charge remaining time T is calculatedupdateIn the process of (2), the charge remaining time is subjected to anti-increase and anti-jump processing.
CN202010209312.9A 2020-03-23 2020-03-23 Charging remaining time display method Pending CN111490305A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111999660A (en) * 2020-08-31 2020-11-27 安徽江淮汽车集团股份有限公司 Charging remaining time determination method, device, storage medium and device
CN112035777A (en) * 2020-09-01 2020-12-04 蜂巢能源科技有限公司 Battery charging remaining time calculation method and device and vehicle
CN112666463A (en) * 2020-12-31 2021-04-16 蜂巢能源科技有限公司 Battery charging remaining time correction display method, correction device and storage device
CN113391221A (en) * 2021-04-27 2021-09-14 浙江合众新能源汽车有限公司 Charging remaining time estimation method and system
CN113525142A (en) * 2020-10-29 2021-10-22 长城汽车股份有限公司 Method and device for reserving charging timing and terminal equipment
CN114859251A (en) * 2021-01-20 2022-08-05 广汽埃安新能源汽车有限公司 Battery charging remaining time calculation method and device and vehicle
CN114859251B (en) * 2021-01-20 2024-06-04 广汽埃安新能源汽车有限公司 Method and device for calculating battery charging remaining time and vehicle

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111999660A (en) * 2020-08-31 2020-11-27 安徽江淮汽车集团股份有限公司 Charging remaining time determination method, device, storage medium and device
CN112035777A (en) * 2020-09-01 2020-12-04 蜂巢能源科技有限公司 Battery charging remaining time calculation method and device and vehicle
CN112035777B (en) * 2020-09-01 2023-06-09 蜂巢能源科技有限公司 Battery charging remaining time calculation method and device and vehicle
CN113525142A (en) * 2020-10-29 2021-10-22 长城汽车股份有限公司 Method and device for reserving charging timing and terminal equipment
CN113525142B (en) * 2020-10-29 2022-06-03 长城汽车股份有限公司 Method and device for reserving charging timing and terminal equipment
CN112666463A (en) * 2020-12-31 2021-04-16 蜂巢能源科技有限公司 Battery charging remaining time correction display method, correction device and storage device
CN112666463B (en) * 2020-12-31 2023-06-30 蜂巢能源科技有限公司 Battery charging remaining time correction display method, correction device and storage device
CN114859251A (en) * 2021-01-20 2022-08-05 广汽埃安新能源汽车有限公司 Battery charging remaining time calculation method and device and vehicle
CN114859251B (en) * 2021-01-20 2024-06-04 广汽埃安新能源汽车有限公司 Method and device for calculating battery charging remaining time and vehicle
CN113391221A (en) * 2021-04-27 2021-09-14 浙江合众新能源汽车有限公司 Charging remaining time estimation method and system

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