Charging remaining time calculation method and device and electric automobile

文档序号：1914417 发布日期：2021-12-03 浏览：12次中文

阅读说明：本技术 一种充电剩余时间计算方法、装置及电动汽车 (Charging remaining time calculation method and device and electric automobile ) 是由沈帅冯莉原张诚龙张骞慧梁海强于 2020-05-29 设计创作，主要内容包括：本发明提供一种充电剩余时间计算方法、装置及电动汽车,涉及电动汽车技术领域,所述方法包括：获取充电电池的当前温度和当前剩余电量,以及为所述充电电池充电的充电桩的最大输出电流；根据所述当前温度、所述当前剩余电量以及所述最大输出电流,确定所述充电电池当前所处的充电阶段；根据预设与所述充电阶段相对应的计算方式,计算所述充电电池由所述当前剩余电量充电至电量充满时的充电剩余时间。本发明的方法可提高电动汽车的充电剩余时间精度,提高用户的使用感受。(The invention provides a charging remaining time calculation method and device and an electric automobile, and relates to the technical field of electric automobiles, wherein the method comprises the following steps: acquiring the current temperature and the current residual capacity of a rechargeable battery and the maximum output current of a charging pile for charging the rechargeable battery; determining the current charging stage of the rechargeable battery according to the current temperature, the current residual capacity and the maximum output current; and calculating the charging remaining time of the rechargeable battery from the current remaining electric quantity to full electric quantity according to a preset calculation mode corresponding to the charging stage. The method can improve the accuracy of the charging remaining time of the electric automobile and improve the use experience of a user.)

1. A charge remaining time calculation method, comprising:

acquiring the current temperature and the current residual capacity of a rechargeable battery and the maximum output current of a charging pile for charging the rechargeable battery;

determining the current charging stage of the rechargeable battery according to the current temperature, the current residual capacity and the maximum output current;

and calculating the charging remaining time of the rechargeable battery from the current remaining electric quantity to full electric quantity according to a preset calculation mode corresponding to the charging stage.

2. The method of calculating the remaining charging time according to claim 1, wherein obtaining a maximum output current of a charging post that charges the rechargeable battery comprises:

and when the output current of the charging pile is less than the request current of the charging battery for a preset time, determining that the maximum output current is equal to the current output current of the charging pile.

3. The method of claim 1, wherein determining the charging phase of the rechargeable battery according to the current temperature, the current remaining capacity and the maximum output current comprises:

presetting a plurality of temperature intervals, a plurality of electric quantity ranges and a plurality of output current ranges, and determining the current charging stage of the rechargeable battery according to the temperature interval of the current temperature, the electric quantity range of the current residual electric quantity and the output current range of the maximum output current.

4. The method of claim 1, wherein calculating the remaining charging time of the rechargeable battery from the current remaining charge to full charge according to a preset calculation mode corresponding to the charging phase comprises:

according to a preset calculation mode corresponding to the charging stages, determining standard charging time, first extended time caused by temperature and second extended time caused by charging pile capacity in each charging stage;

and calculating the charging remaining time when the rechargeable battery is charged from the current remaining capacity to full capacity according to the first extended time, the second extended time and the standard charging time.

5. The charge remaining time calculation method according to claim 4, wherein the first extended time is zero when at least one of the following conditions is satisfied:

the current temperature is greater than a first temperature;

the current residual electric quantity is greater than a first electric quantity;

the maximum output current is less than the first output current.

6. The charge remaining time calculation method according to claim 4, wherein the second extended time is zero when at least one of the following conditions is satisfied:

the maximum output current is greater than or equal to a second output current;

the maximum output current is greater than or equal to a third output current and less than a second output current, and the current residual capacity is greater than the second capacity;

the maximum output current is greater than or equal to a fourth output current and less than a third output current, and the current residual capacity is greater than a third capacity;

the maximum output current is greater than or equal to a fourth output current and less than a third output current, and the current residual capacity is greater than or equal to a fourth capacity;

the maximum output current is less than the first output current.

7. The method of calculating a charging remaining time according to claim 1, wherein after calculating the charging remaining time when the rechargeable battery is charged from the current remaining capacity to full capacity, the method further comprises:

and when the current residual capacity is smaller than or equal to a preset initial value and the error of the currently calculated charging residual time is larger than a preset error range, correcting the currently calculated charging residual time, and determining the corrected charging residual time as the calibration charging residual time.

8. The charge remaining time calculation method according to claim 7, wherein correcting the currently calculated charge remaining time includes:

calculating a correction coefficient according to the charging remaining time of the adjacent charging processes before the current charging process;

correcting the currently calculated charging remaining time according to the correction coefficient; and starting charging when the residual electric quantity is less than or equal to the preset initial value in the adjacent charging processes.

9. The charge remaining time calculation method according to claim 1, further comprising:

and when the rechargeable battery is charged to a preset voltage value from the voltage value of the current electric quantity, calculating the charging remaining time according to the full-charge voltage of the rechargeable battery.

10. A charging remaining time calculation device, comprising:

the acquisition module is used for acquiring the current temperature and the current residual capacity of the rechargeable battery and the maximum output current of a charging pile for charging the rechargeable battery;

the determining module is used for determining the current charging stage of the rechargeable battery according to the current temperature, the current residual capacity and the maximum output current;

and the first calculation module is used for calculating the charging remaining time of the rechargeable battery from the current remaining electric quantity to full electric quantity according to a preset calculation mode corresponding to the charging stage.

11. The charging remaining time calculation apparatus according to claim 10, wherein after the first calculation module, the apparatus further comprises:

and the correction module is used for correcting the currently calculated charging remaining time when the current remaining power is less than or equal to a preset initial value and the error of the currently calculated charging remaining time is greater than a preset error range, and determining the corrected charging remaining time as the calibration charging remaining time.

12. The charge remaining time calculation device according to claim 10, further comprising:

and the second calculation module is used for calculating the charging remaining time according to the full-charge voltage of the rechargeable battery when the rechargeable battery is charged to a preset voltage value from the voltage value of the current electric quantity.

13. An electric vehicle characterized by comprising the charge remaining time calculation device according to any one of claims 10 to 12.

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a charging remaining time calculation method and device and an electric automobile.

Background

When the pure electric vehicle is charged due to insufficient electric quantity, a user needs to be reminded of the remaining charging time, and the use experience of the user is improved. The problem that the estimation of the charging remaining time is inaccurate due to general feedback in the current market is solved because the charging remaining time is related to uncertain factors in various aspects such as the output capacity of a charging pile, a charging current strategy, the charging capacity, the battery temperature, the battery heating rate, the battery cooling rate and the battery activity state, and the model calculation is difficult to accurately estimate the charging remaining time. There is a high necessity for a calculation method that minimizes the error of the remaining charging time, improves the accuracy of the remaining charging time, provides accurate reference for the user, and improves the use feeling during charging.

Disclosure of Invention

The embodiment of the invention aims to provide a charging remaining time calculation method and device and an electric automobile, so that the problem that the charging remaining time calculation is inaccurate when the electric automobile is charged in the prior art is solved.

In order to achieve the above object, the present invention provides a charge remaining time calculation method, including:

acquiring the current temperature and the current residual capacity of a rechargeable battery and the maximum output current of a charging pile for charging the rechargeable battery;

determining the current charging stage of the rechargeable battery according to the current temperature, the current residual capacity and the maximum output current;

Optionally, obtaining a maximum output current of a charging pile for charging the rechargeable battery includes:

Optionally, determining a current charging stage of the rechargeable battery according to the current temperature, the current remaining capacity and the maximum output current, includes:

Optionally, calculating the charging remaining time of the rechargeable battery from the current remaining capacity to full capacity according to a preset calculation mode corresponding to the charging stage, including:

Optionally, the first extended time is zero when at least one of the following conditions is satisfied:

the current temperature is greater than a first temperature;

the current residual electric quantity is greater than a first electric quantity;

the maximum output current is less than the first output current.

Optionally, the second extension time is zero when at least one of the following conditions is satisfied:

the maximum output current is greater than or equal to a second output current;

the maximum output current is greater than or equal to a third output current and less than a second output current, and the current residual capacity is greater than the second capacity;

the maximum output current is greater than or equal to a fourth output current and less than a third output current, and the current residual capacity is greater than a third capacity;

the maximum output current is greater than or equal to a fourth output current and less than a third output current, and the current residual capacity is greater than or equal to a fourth capacity;

the maximum output current is less than the first output current.

Optionally, after calculating a charging remaining time when the rechargeable battery is charged from the current remaining capacity to full capacity, the method further includes:

Optionally, the correcting the currently calculated remaining charging time includes:

calculating a correction coefficient according to the charging remaining time of the adjacent charging processes before the current charging process;

Optionally, the method further comprises:

The present invention also provides a charging remaining time calculation apparatus, including:

Optionally, after the first calculating module, the apparatus further comprises:

Optionally, the apparatus further comprises:

The invention also provides an electric automobile which comprises the charging remaining time calculating device.

The technical scheme of the invention at least has the following beneficial effects:

in the scheme, the current temperature and the current residual capacity of the rechargeable battery and the maximum output current of the charging pile for charging the rechargeable battery are obtained; determining the current charging stage of the rechargeable battery according to the current temperature, the current residual capacity and the maximum output current; and calculating the charging remaining time of the rechargeable battery from the current remaining capacity to full capacity according to a preset calculation mode corresponding to the charging stage, so that the error of the charging remaining time can be reduced, and the calculation precision of the charging remaining time is improved.

Drawings

Fig. 1 is a step diagram of a charging remaining time calculation method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a charging remaining time calculation apparatus according to an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

The embodiment of the invention aims at solving the problem that the charging remaining time is calculated inaccurately when the electric automobile is charged in the prior art.

As shown in fig. 1, an embodiment of the present invention provides a charging remaining time calculation method, including:

step S11, acquiring the current temperature and the current residual capacity of a rechargeable battery and the maximum output current of a charging pile for charging the rechargeable battery;

step S12, determining the current charging stage of the rechargeable battery according to the current temperature, the current residual capacity and the maximum output current;

step S13, calculating the charging remaining time when the rechargeable battery is fully charged from the current remaining capacity according to a preset calculation method corresponding to the charging stage.

In the embodiment of the invention, because the electric automobile is influenced by the temperature, the residual capacity and the maximum output current of the charging pile when being charged, the method calculates the charging residual time under different temperatures, different residual capacities and different maximum output currents of the charging pile, avoids the problem that the charging residual time is influenced in various aspects, so that the model calculation is difficult to accurately estimate, improves the accuracy of the charging residual time, and improves the use experience of users.

Specifically, in step S11, the obtaining of the maximum output current of the charging pile for charging the rechargeable battery includes:

In this embodiment of the present invention, when the current request current of the rechargeable battery is greater than or equal to the sum of the maximum output current of the charging pile and the first threshold, and the current output current of the charging pile is smaller than the difference between the maximum output current and the second threshold, and lasts for a preset time, at this time, the maximum output current is assigned as the current output current of the charging pile to calculate the charging remaining time. Here, the first threshold may be set to 10A, the second threshold may be set to 30A, and the preset time may be set to 1 min.

It should be noted that, under the above circumstances, the rechargeable battery continues to be charged, and when the current request current of the rechargeable battery is greater than or equal to the sum of the newly assigned maximum output current and the second threshold and lasts for a preset time, the maximum output current is reassigned to the current output current of the charging pile to calculate the charging remaining time.

It should be noted that the maximum output current of the charging pile has an influence on the charging remaining time, so that the average error of the charging remaining time is minimized by using a least square method according to the charging current-time curve of the pile in the whole charging process, and the charging process can be divided into a plurality of charging stages.

Further, in step S12, determining the charging phase of the rechargeable battery according to the current temperature, the current remaining capacity and the maximum output current, includes:

In this embodiment of the present invention, 3 temperature intervals are preset, each temperature interval is further divided into 5 output current ranges, each output current range is further divided into 2 to 4 electric quantity ranges, and a total of 48 charging stages are set. And determining the current charging stage of the rechargeable battery according to the current temperature, the current residual capacity and the maximum output current when the charging rates of different charging stages are different in the whole charging process, and calculating the charging residual time by adopting a self-adaptive fitting segmentation algorithm.

In an optional embodiment of the present invention, in step S13, calculating the charging remaining time when the rechargeable battery is charged from the current remaining capacity to full capacity according to a preset calculation method corresponding to the charging stage, includes:

In this embodiment of the present invention, the remaining charging time is equal to the sum of the first extended time, the second extended time, and the standard charging time. However, the first extended time, the second extended time, and the standard charging time are calculated differently in different charging phases.

Specifically, the first extension time is zero when at least one of the following conditions is satisfied:

the current temperature is greater than a first temperature;

the current residual electric quantity is greater than a first electric quantity;

the maximum output current is less than the first output current.

In this embodiment of the present invention, the first extended time is zero when the present temperature is equal to or greater than 15 ℃, or the present remaining capacity is greater than 95%, or the maximum output current is less than 50A.

Further, the second extended time is zero when at least one of the following conditions is satisfied:

the maximum output current is greater than or equal to a second output current;

the maximum output current is greater than or equal to a third output current and less than a second output current, and the current residual capacity is greater than the second capacity;

the maximum output current is greater than or equal to a fourth output current and less than a third output current, and the current residual capacity is greater than a third capacity;

the maximum output current is greater than or equal to a fourth output current and less than a third output current, and the current residual capacity is greater than or equal to a fourth capacity;

the maximum output current is less than the first output current.

In this embodiment of the present invention, when the maximum output current is greater than or equal to 235A, or 118A is less than or equal to the maximum output current < 235A and the current remaining capacity is greater than 67%, or 78A is less than or equal to the maximum output current < 118A and the current remaining capacity is greater than 76%, or 50A is less than or equal to the maximum output current < 78A and the current remaining capacity is greater than or equal to 80%, the second extension time is zero.

Since the remaining charging time of each charging stage is equal to the sum of the first extended time, the second extended time and the standard charging time, the following detailed descriptions are provided for the calculation methods of the first extended time, the second extended time and the standard charging time presetting for a total of 48 charging stages:

t: the current temperature of the rechargeable battery; CML: the maximum output current of the charging pile; SOC: the remaining capacity of the rechargeable battery; SOC 0: an initial remaining capacity of the rechargeable battery; and C, the rated capacity of the rechargeable battery.

Stage 1: t is less than or equal to 15 ℃, CML is more than or equal to 235A, and SOC is less than 80%:

(20-T)/70 x 60 for a first extended time; the second extension time is 0;

standard charge time (1+0.28 SOC0) (0.8-SOC)/0.94 SOC 60+22+30 (1+0.25 SOC 0).

And (2) stage: t is less than or equal to 15 ℃, CML is more than or equal to 235A, SOC is more than or equal to 80% and less than 95%:

(20-T)/70 x 60 for a first extended time; the second extension time is 0;

standard charge time 1.5 (0.95-SOC) 100+6 (1-SOC) 100 (1+0.25 SOC 0);

it should be noted that when the voltage of the rechargeable battery approaches the full-charge voltage, the rechargeable battery is charged by using a reduced current, the reduced current is equal to 1A, and the charging remaining time is extended by 100s, and at this time, the charging remaining time is equal to 0.57 × 4250 — the full-charge voltage.

And (3) stage: t is less than or equal to 15 ℃, CML is more than or equal to 235A, and SOC is more than or equal to 95%:

the first extension time is 0; the second extension time is 0;

standard charge time 6 (1-SOC) 100 (1+0.25 SOC 0);

And (4) stage: t is less than or equal to 15 ℃, CML is more than 235A and less than or equal to 118A, and SOC is less than or equal to 67%:

(20-T)/70 x 60 for a first extended time;

the second extension time is 10 (120/CML-0.51)/0.49 (0.67-SOC)/0.67;

standard charging time ═ 1+0.28 SOC0 +(0.8-SOC)/0.94 +

25+(1+0.008*(T-35))*30。

And (5) stage: t is less than or equal to 15 ℃, CML is more than 235A and less than or equal to 118A, SOC is more than 67 percent and less than 80 percent: the same as the stage 1.

And 6: t is less than or equal to 15 ℃, CML is more than 235A and less than or equal to 118A, SOC is more than or equal to 80% and less than 95%: the same as the stage 2.

And (7) stage: t is less than or equal to 15 ℃, CML is more than 235A and less than or equal to 118A, and SOC is more than or equal to 95%: the same as the stage 3.

And (8): t is less than or equal to 15 ℃, CML is more than 118A and less than or equal to 78A, and SOC is less than or equal to 76%:

(20-T)/70 x 60 for a first extended time;

the second extension time is 10 x (0.76-SOC)/0.76

+25*(80/CML-0.66)/0.66*(0.76-SOC)/0.76；

The standard charging time is calculated in the same manner as in stage 1.

And (9) stage: t is less than or equal to 15 ℃, CML is more than 118A and less than or equal to 78A, SOC is more than 76 percent and less than 80 percent: the same as the stage 1.

Stage 10: t is less than or equal to 15 ℃, CML is more than 118A and less than or equal to 78A, and SOC is more than or equal to 80% and less than 95%: the same as the stage 2.

Stage 11: t is less than or equal to 15 ℃, CML is more than 118A and less than or equal to 78A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 12: t is less than or equal to 15 ℃, CML is more than 78A and less than or equal to 50A, and SOC is less than 80%:

(20-T)/70 x 60 for a first extended time;

the second extension time was 35 × 35 (0.8-SOC)/0.8+15 (70/CML-0.9)/0.13 (0.8-SOC)/0.8

The standard charging time is calculated in the same manner as in stage 1.

And (3) stage 13: t is less than or equal to 15 ℃, CML is more than 78A and less than or equal to 50A, and SOC is more than or equal to 80% and less than 95%: the same as the stage 2.

Stage 14: t is less than or equal to 15 ℃, CML is more than 78A and less than or equal to 50A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 15: t is less than or equal to 15 ℃, CML is less than 50A, SOC is less than 95%:

the remaining charge time was (0.95-SOC) × C/CML +6 × (1-SOC) × 100 (1+0.008 × (T-35)).

It should be noted that when the voltage of the rechargeable battery approaches the full-charge voltage, the rechargeable battery is charged by using a reduced current, the reduced current is equal to 1A, and the charging remaining time is extended by 100s, and at this time, the charging remaining time is equal to 0.6 × 4250 — the full-charge voltage.

Stage 16: t is less than or equal to 15 ℃, CML is less than 50A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 17: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than or equal to 235A, and SOC is less than 80%:

the first extension time is 0; the second extension time and the standard charging time are calculated in the same manner as in phase 1.

Stage 18: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than or equal to 235A, SOC is more than or equal to 80% and less than 95%:

the first extension time is 0; the calculation mode of the second extension time and the standard charging time is the same as the stage 2;

Stage 19: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than or equal to 235A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 20: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 235A and less than or equal to 118A, and SOC is less than or equal to 67%:

the first extension time is 0; the second extension time and the standard charging time are calculated in the same manner as in stage 4.

Stage 21: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 235A and less than or equal to 118A, and SOC is more than 67% and less than 80%: the same as stage 17.

Stage 22: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 235A and less than or equal to 118A, and SOC is more than or equal to 80% and less than 95%: as in stage 18.

And stage 23: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 235A and less than or equal to 118A, and SOC is more than or equal to 95%: the same as the stage 3.

And (24): t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 118A and less than or equal to 78A, and SOC is less than or equal to 76%:

the first extension time is 0; the second extension time and the standard charging time are calculated in the same manner as in stage 8.

Stage 25: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 118A and less than or equal to 78A, and SOC is more than 76% and less than 80%: the same as stage 17.

Stage 26: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 118A and less than or equal to 78A, and SOC is more than or equal to 80% and less than 95%: as in stage 18.

Stage 27: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 118A and less than or equal to 78A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 28: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 78A and less than or equal to 50A, and SOC is less than 80%:

the first extension time is 0; the second extended time and the standard charging time are the same as phase 12.

Stage 29: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 78A and less than or equal to 50A, and SOC is more than or equal to 80% and less than 95%: as in stage 18.

Stage 30: t is more than 15 ℃ and less than or equal to 35 ℃, CML is more than 78A and less than or equal to 50A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 31: t is more than 15 ℃ and less than or equal to 35 ℃, CML is less than 50A, and SOC is less than 95%:

the remaining charge time was (0.95-SOC) × C/CML +6 × (1-SOC) × 100 (1+0.008 × (T-35)).

Stage 32: t is more than 15 ℃ and less than or equal to 35 ℃, CML is less than 50A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 33: t is more than 35 ℃, CML is more than or equal to 235A, and SOC is less than 80%: the same as stage 17.

Stage 34: t is more than 35 ℃, CML is more than or equal to 235A, SOC is more than or equal to 80% and less than 95%: as in stage 18.

Stage 35: t is more than 35 ℃, CML is more than or equal to 235A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 36: t is more than 35 ℃, CML is more than 235A and is less than or equal to 118A, and SOC is less than or equal to 67%: the same as the stage 20.

Stage 37: t is more than 35 ℃, CML is more than 235A and less than or equal to 118A, SOC is more than 67 percent and less than 80 percent: the same as stage 17.

Stage 38: t is more than 35 ℃, CML is more than 235A and less than or equal to 118A, SOC is more than or equal to 80% and less than 95%: as in stage 18.

Stage 39: t is more than 35 ℃, CML is more than 235A and less than or equal to 118A, and SOC is more than or equal to 95%: the same as the stage 3.

And (4) stage 40: t is more than 35 ℃, CML is more than 118A and is less than or equal to 78A, SOC is less than or equal to 76%: as in stage 24.

Stage 41: t is more than 35 ℃, CML is more than 118A and less than or equal to 78A, SOC is more than 76 percent and less than 80 percent: the same as stage 17.

Stage 42: t is more than 35 ℃, CML is more than 118A and less than or equal to 78A, SOC is more than or equal to 80% and less than 95%: as in stage 18.

Stage 43: t is more than 35 ℃, CML is more than 118A and less than or equal to 78A, and SOC is more than or equal to 95%: the same as the stage 3.

Stage 44: t is more than 35 ℃, CML is more than 78A and less than or equal to 50A, and SOC is less than 80%: as in stage 28.

Stage 45: t is more than 35 ℃, CML is more than 78A and less than or equal to 50A, SOC is more than or equal to 80% and less than 95%: as in stage 18.

Stage 46: t is more than 35 ℃, CML is more than 78A and less than or equal to 50A, and SOC is more than or equal to 95%: the same as the stage 3.

And (47): t is more than 35 ℃, CML is less than 50A, SOC is less than 95%:

the remaining charge time was (0.95-SOC) × C/CML +6 × (1-SOC) × 100 (1+0.008 × (T-35)).

Stage 48: t is more than 35 ℃, CML is less than 50A, and SOC is more than or equal to 95%: the same as the stage 3.

The present invention will be described in more detail below with reference to a specific embodiment of the present invention.

After calculating the charging remaining time when the rechargeable battery is charged from the current remaining capacity to full capacity, the method further comprises:

In this embodiment of the present invention, in order to avoid an error caused by aging of the rechargeable battery, the calculated remaining charging time needs to be corrected, and the remaining charging time needs to be determined and corrected, so that the error of the calculated remaining charging time is within 10min, thereby improving the calculation accuracy.

Specifically, the correcting the currently calculated remaining charging time includes:

calculating a correction coefficient according to the charging remaining time of the adjacent charging processes before the current charging process;

In this embodiment of the present invention, in each of the charging stages with SOC less than 80%, the currently calculated remaining charging time is corrected when the following condition is satisfied.

And calculating the calibration charging remaining time (1+ X) by the currently calculated charging remaining time, wherein X is a correction coefficient and is calculated according to the charging remaining time of a plurality of charging stages when the charging is carried out to preset remaining capacity information in the adjacent three charging processes.

(1) The rechargeable battery is charged from the initial remaining capacity of less than or equal to 50% and is corrected when the rechargeable battery is charged to a full state.

(2) Calculating the charging remaining time T1 when the initial remaining capacity of the rechargeable battery is 0, calculating the real charging remaining time T2 when the rechargeable battery is charged to full charge from 0, taking the average value of the standard charging time when the initial remaining capacity of the rechargeable battery is 0 to 67% of the remaining capacity as the estimated charging remaining time T3, and correcting when the time T2+ T3 is less than or equal to 100min and the time T2+ T3-T1 is more than or equal to 8 min; or when T2+ T3 is more than 100min and (T2+ T3)/T1 is more than or equal to 8 percent.

Wherein X ═ T2+ T3)/standard charging time of phase 1 in which charging was started with an initial remaining capacity of 0, and the correction coefficient is in the range of-50% to 50%.

In each charging stage with the SOC between 80% and 95%, the correction condition with the SOC less than 80% needs to be met for correction. The correction coefficient at this time is an average value of ratios of real remaining charging time to calculated remaining charging time adjacent to the current charging process three times from 80% to 95% of the remaining capacity.

In each charging stage with the SOC greater than 95%, the correction can be carried out by meeting the correction condition that the SOC is less than 80%. The correction factor at this time is an average value of the ratio of the actual remaining charging time to the calculated remaining charging time, which is adjacent to the current charging process, three times from 95% to 100% of the remaining charge.

The method further comprises the following steps: and when the rechargeable battery is charged to a preset voltage value from the voltage value of the current electric quantity, calculating the charging remaining time according to the full-charge voltage of the rechargeable battery.

In the embodiment of the invention, when the charging pile of the rechargeable battery is close to a full-charge state, the charging is carried out by adopting the reduced current, the charging remaining time is delayed, the calculation mode of the charging remaining time is not determined by the first extended time, the second extended time and the standard charging time any more, and the calculation mode is carried out according to the full-charge voltage of the rechargeable battery.

Corresponding to the above method embodiment, an embodiment of the present invention further provides a charging remaining time calculation apparatus, including:

the acquiring module 21 is configured to acquire a current temperature and a current remaining power of a rechargeable battery, and a maximum output current of a charging pile that charges the rechargeable battery;

a determining module 22, configured to determine, according to the current temperature, the current remaining power, and the maximum output current, a current charging stage of the rechargeable battery;

the first calculating module 23 is configured to calculate a charging remaining time when the rechargeable battery is charged from the current remaining capacity to a full capacity according to a preset calculating manner corresponding to the charging stage.

In this embodiment of the present invention, the charging remaining time calculating device applies the method described above, and the following description of the beneficial effects is omitted.

Specifically, the obtaining module 21 is specifically configured to: and when the output current of the charging pile is less than the request current of the charging battery for a preset time, determining that the maximum output current is equal to the current output current of the charging pile.

The determining module 22 is specifically configured to: presetting a plurality of temperature intervals, a plurality of electric quantity ranges and a plurality of output current ranges, and determining the current charging stage of the rechargeable battery according to the temperature interval of the current temperature, the electric quantity range of the current residual electric quantity and the output current range of the maximum output current.

The first calculating module 23 is specifically configured to: according to a preset calculation mode corresponding to the charging stages, determining standard charging time, first extended time caused by temperature and second extended time caused by charging pile capacity in each charging stage;

Further, the first extended time is zero when at least one of the following conditions is satisfied: