WO2021056864A1 - 电池剩余能量的估算方法、装置及车辆 - Google Patents
电池剩余能量的估算方法、装置及车辆 Download PDFInfo
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- WO2021056864A1 WO2021056864A1 PCT/CN2019/126405 CN2019126405W WO2021056864A1 WO 2021056864 A1 WO2021056864 A1 WO 2021056864A1 CN 2019126405 W CN2019126405 W CN 2019126405W WO 2021056864 A1 WO2021056864 A1 WO 2021056864A1
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- battery
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Definitions
- the present invention relates to the field of battery technology, and in particular to a method, device and vehicle for estimating the remaining energy of a battery.
- the state of energy (SOE) is an important state indicator of the power battery of an electric vehicle.
- the remaining battery energy SOE of the lithium-ion battery predicted by the identification and prediction of the electric vehicle working condition can be calculated by the remaining battery energy SOE.
- the battery remaining energy SOE can reflect the current remaining energy state of the battery, which is divided into theoretical remaining energy and actual remaining energy. Since the theoretical remaining energy cannot accurately reflect the current remaining energy state of the battery, it is particularly important to estimate the actual remaining energy of the battery. .
- the present invention aims to solve one of the technical problems in the related art at least to a certain extent.
- the first object of the present invention is to provide a method for estimating the remaining energy of the battery, which can more accurately reflect the current remaining energy state of the battery.
- the second object of the present invention is to provide a device for estimating the remaining energy of the battery.
- the third object of the present invention is to provide a vehicle.
- an embodiment of the first aspect of the present invention proposes a method for estimating the remaining energy of a battery, including: obtaining the theoretical remaining energy of the battery; obtaining the ratio of the discharged energy of the battery within a set time before the current moment; Obtain the health status of the battery; and calculate the actual remaining energy of the battery according to the theoretical remaining energy, the discharge energy ratio, and the health status.
- the method for estimating the remaining energy of the battery in the embodiment of the present invention obtains the theoretical remaining energy of the battery, the ratio of the discharged energy of the battery within a set time before the current moment, and the state of health of the battery, according to the theoretical remaining energy, the ratio of the discharged energy and the state of health , Calculate the actual remaining energy of the battery, the actual remaining energy of the battery can more accurately reflect the current remaining energy state of the battery.
- an embodiment of the second aspect of the present invention proposes a battery remaining energy estimation device, including: a first acquisition module for acquiring the theoretical remaining energy of the battery; a second acquisition module for acquiring the battery The discharge energy ratio within a set time before the current moment; the third acquisition module is used to acquire the state of health of the battery; the calculation module is used to calculate the theoretical remaining energy, the discharge energy ratio, and the health State, calculate the actual remaining energy of the battery.
- the device for estimating the remaining energy of the battery proposed in the embodiment of the present invention obtains the theoretical remaining energy of the battery, the ratio of the discharged energy of the battery within a set time before the current moment, and the state of health of the battery, according to the theoretical remaining energy, the ratio of the discharged energy and the health State, the actual remaining energy of the battery is obtained, and the actual remaining energy of the battery can more accurately reflect the current remaining energy state of the battery.
- an embodiment of the third aspect of the present invention provides a vehicle, which includes the device for estimating the remaining battery energy according to the embodiment of the second aspect of the present invention.
- FIG. 1 is a schematic flowchart of a method for estimating remaining battery energy according to an embodiment of the present invention
- FIG. 2 is a schematic flowchart of obtaining the discharge energy ratio of a battery within a set time before the current time according to an embodiment of the present invention
- FIG. 3 is a schematic flowchart of obtaining a discharge rate of a battery within a set time before the current time according to an embodiment of the present invention
- FIG. 4 is a schematic flowchart of obtaining the equivalent current of the battery within a set time before the current time according to an embodiment of the present invention
- FIG. 5 is a schematic flowchart of obtaining the predicted temperature of the battery unit time after the current time according to an embodiment of the present invention
- FIG. 6 is a schematic structural diagram of a device for estimating remaining battery energy provided by an embodiment of the present invention.
- Fig. 7 is a schematic structural diagram of a vehicle provided by an embodiment of the present invention.
- FIG. 1 is a schematic flowchart of a method for estimating remaining battery energy according to an embodiment of the present invention.
- the method for estimating remaining battery energy in the embodiments of the present invention can be applied to various existing devices that use batteries as energy sources, such as vehicles, tablet computers, notebook computers, personal computers, smart phones, and so on.
- the method for estimating the remaining energy of the battery includes the following steps:
- the actual parameters of the battery can be collected, such as the current remaining capacity percentage of the battery (State Of Charge, SOC for short), etc., and the theoretical remaining energy of the battery can be obtained according to the collected actual parameters of the battery.
- the current remaining capacity percentage SOC of the battery can be obtained, and the theoretical remaining energy can be obtained according to the corresponding relationship between the remaining capacity percentage SOC and the pre-stored remaining capacity percentage SOC and the theoretical remaining energy.
- the corresponding relationship between the remaining capacity percentage SOC and the theoretical remaining energy can be obtained by charging and discharging the battery.
- S102 Obtain a discharge energy ratio of the battery within a set time before the current time.
- the set time can be set by the user as needed, for example, it can be set to 30 minutes.
- the discharge energy ratio Kegy is the ratio of the discharged energy to the rated energy.
- S103 Obtain the state of health (State of Health, SOH for short) of the battery.
- the current state of health SOH of the battery is obtained.
- the actual remaining energy RealEgy of the battery is calculated according to the theoretical remaining power Egy_table, the discharge energy ratio Kegy, and the state of health SOH based on the various data obtained in the above steps.
- the theoretical remaining energy of the battery, the discharge energy ratio of the battery within the set time before the current moment, and the state of health SOH of the battery are obtained. According to the theoretical remaining energy, the ratio of discharge energy and the state of health SOH, the battery’s The actual remaining energy, the actual remaining energy of the battery can more accurately reflect the current remaining energy state of the battery.
- step S102 in the foregoing embodiment may specifically include the following steps:
- S201 Acquire the discharge rate of the battery within a set time before the current time.
- the discharge rate is a measure of the discharge speed, which refers to the current value required by the battery to discharge its rated capacity at a specified time. Get the set time of the battery in the past, for example, the discharge rate DchaC within 30 minutes.
- the unit time can be set to 1 minute, and the unit time of the battery after the current time can be predicted according to the temperature of the battery at the current time, for example, the temperature after 1 minute is the predicted temperature Tpred.
- the discharge energy ratio Kegy can be obtained according to the correspondence between the discharge rate DchaC and the predicted temperature Tpred obtained in steps S201 and S202, and the pre-stored discharge rate DchaC, the predicted temperature Tpred, and the discharge energy ratio Kegy.
- the corresponding relationship between the discharge rate DchaC, the predicted temperature Tpred, and the discharge energy ratio Kegy can be obtained by performing a discharge test (test) on the battery.
- the ratio of the discharged energy to the rated energy is obtained, that is, the discharge energy ratio Kegy, which is recorded as the discharge rate DchaC, the predicted temperature Tpred and the discharge energy
- the discharge energy ratio Kegy of the battery is obtained by looking up the table.
- step S201 in the foregoing embodiment may specifically include the following steps:
- S301 Obtain an equivalent current of the battery within a set time before the current time.
- the set time can be set to 30 minutes to obtain the equivalent current Ieq of the battery in the past 30 minutes.
- step S301 in the foregoing embodiment may specifically include the following steps:
- S401 Obtain the average current of the battery per unit time within a set time before the current time.
- a 30-dimensional average current array can be established. The initial value is 1/3C. After every 1 minute of operation, the average current is updated to the last value of the array, and the first value is discarded to form the battery’s total value in the past 30 minutes.
- a 30-dimensional average current array composed of average currents.
- the equivalent current within the set time is obtained according to the average current per minute of the battery in the past 30 minutes.
- the equivalent current Ieq in the past 30 minutes can be calculated according to the following recurrence formula: Among them, I[k] represents the average current in the kth minute, and ⁇ is a constant, for example, it can be set to 0.05, that is, the closer the distance to the current moment is, the greater the weight of the average current in the minute when calculating the equivalent current .
- step S202 in the foregoing embodiment may specifically include the following steps:
- S501 Obtain an average temperature rise of the battery corresponding to a unit time within a set time before the current time.
- the temperature rise is the elevated temperature.
- the set time can be set to 30 minutes, and the unit time can be set to 1 minute to obtain the average temperature rise of the battery per minute in the past 30 minutes.
- the average temperature rise of the battery per unit time within a set time before the current time can be obtained, and the sum of the average temperature rise per unit time within the set time can be calculated, and the calculation is based on the sum value.
- a 30-dimensional average temperature rise array can be established, and the temperature rise value can be obtained by looking up the table according to the battery temperature and ambient temperature.
- the average temperature rise per minute is calculated, and the last value of the array is updated, and the first value is discarded to form the battery in the past.
- the 30-dimensional average temperature rise array is composed of the average temperature rise per minute within 30 minutes. Sum the average temperature rise array and take the average value as the average temperature rise DeltaTavg corresponding to each minute in the past 30 minutes.
- S502 Obtain the predicted temperature according to the average temperature rise corresponding to the unit time within the set time and the current temperature of the battery.
- the current temperature of the battery is the temperature of the single cell with the lowest temperature in the battery pack. Calculate the sum of the average temperature rise DeltaTavg per unit time within the set time and the current temperature Tmin of the battery to obtain the predicted temperature Tpred.
- the present invention also provides a device for estimating the remaining energy of the battery.
- Fig. 6 is a schematic structural diagram of a device for estimating remaining battery energy provided by an embodiment of the present invention. As shown in FIG. 6, the device for estimating the remaining energy of the battery includes: a first acquisition module 61, a second acquisition module 62, a third acquisition module 63, and a calculation module 64.
- the first obtaining module 61 is used to obtain the theoretical remaining energy of the battery.
- the second acquiring module 62 is configured to acquire the discharge energy ratio of the battery within a set time before the current time.
- the third obtaining module 63 is used to obtain the health state SOH of the battery.
- the calculation module 64 is configured to calculate the actual remaining energy of the battery according to the theoretical remaining energy, the discharge energy ratio, and the state of health SOH.
- the first obtaining module 61 may be specifically configured to: obtain the current remaining capacity percentage SOC of the battery; and obtain the theoretical remaining energy according to the remaining capacity percentage SOC and the corresponding relationship between the pre-stored remaining capacity percentage SOC and the theoretical remaining energy.
- the second obtaining module 62 may be specifically configured to: obtain the discharge rate of the battery within a set time before the current time; obtain the predicted temperature of the battery after the current time per unit time; and obtain according to the discharge rate and the predicted temperature Discharge energy ratio.
- the second obtaining module 62 may be specifically configured to: obtain the equivalent current of the battery within a set time before the current moment; and obtain the discharge rate according to the equivalent current and the rated capacity of the battery.
- the second obtaining module 62 may be specifically configured to: obtain the average current of the battery per unit time within a set time before the current time; and obtain the average current per unit time within the set time The equivalent current.
- the second acquiring module 62 may be specifically configured to: acquire the average temperature rise corresponding to the unit time within a set time before the current time; according to the average temperature rise corresponding to the unit time within the set time and the current temperature of the battery , Get the predicted temperature.
- the second obtaining module 62 may be specifically configured to: obtain the average temperature rise per unit time of the battery within a set time before the current moment; calculate the sum of the average temperature rise per unit time within the set time; According to the sum value, the average temperature rise corresponding to the unit time within the set time is calculated.
- the theoretical remaining energy of the battery, the discharge energy ratio of the battery within the set time before the current moment, and the state of health SOH of the battery are obtained. According to the theoretical remaining energy, the ratio of discharge energy and the state of health SOH, the battery’s The actual remaining energy, the actual remaining energy of the battery can more accurately reflect the current remaining energy state of the battery.
- Fig. 7 is a schematic structural diagram of a vehicle provided by an embodiment of the present invention.
- the vehicle 71 includes: a device 72 for estimating the remaining battery energy as shown in the above-mentioned embodiment.
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Claims (11)
- 一种电池剩余能量的估算方法,其特征在于,包括:获取电池的理论剩余能量;获取所述电池在当前时刻之前的设定时间内的放电能量比率;获取所述电池的健康状态;根据所述理论剩余能量、所述放电能量比率和所述健康状态,计算得到所述电池的实际剩余能量。
- 根据权利要求1所述的估算方法,其特征在于,所述获取电池的理论剩余能量,包括:获取所述电池当前的剩余容量百分比;根据所述剩余容量百分比和预先存储的剩余容量百分比和理论剩余能量的对应关系,得到所述理论剩余能量。
- 根据权利要求1所述的估算方法,其特征在于,所述获取所述电池在当前时刻之前的设定时间内的放电能量比率,包括:获取所述电池在当前时刻之前的所述设定时间内的放电倍率;获取所述电池在当前时刻之后的单位时间后的预测温度;根据所述放电倍率和所述预测温度,得到所述放电能量比率。
- 根据权利要求3所述的估算方法,其特征在于,所述获取所述电池在当前时刻之前的所述设定时间内的放电倍率,包括:获取所述电池在当前时刻之前的所述设定时间内的等效电流;根据所述等效电流和所述电池的额定容量,得到所述放电倍率。
- 根据权利要求4所述的估算方法,其特征在于,所述获取所述电池在当前时刻之前的所述设定时间内的等效电流,包括:获取所述电池在当前时刻之前的所述设定时间内每单位时间内的平均电流;根据所述设定时间内每单位时间内的所述平均电流,得到所述设定时间内的等效电流。
- 根据权利要求3所述的估算方法,其特征在于,所述获取所述电池在当前时刻之后的单位时间后的预测温度,包括:获取所述电池在当前时刻之前的所述设定时间内单位时间对应的平均温升;根据所述设定时间内单位时间对应的平均温升和所述电池当前时刻的温度,得到所述预测温度。
- 根据权利要求6所述的估算方法,其特征在于,所述获取所述电池在当前时刻之前 的所述设定时间内单位时间对应的平均温升,包括:获取所述电池在当前时刻之前的所述设定时间内每单位时间内的平均温升;计算所述设定时间内每单位时间内的平均温升的和值;根据所述和值计算得到所述设定时间内单位时间对应的平均温升。
- 一种电池剩余能量的估算装置,其特征在于,包括:第一获取模块,用于获取电池的理论剩余能量;第二获取模块,用于获取所述电池在当前时刻之前的设定时间内的放电能量比率;第三获取模块,用于获取所述电池的健康状态;计算模块,用于根据所述理论剩余能量、所述放电能量比率和所述健康状态,计算得到所述电池的实际剩余能量。
- 根据权利要求8所述的估算装置,其特征在于,所述第一获取模块具体用于:获取所述电池当前的剩余容量百分比;根据所述剩余容量百分比和和预先存储的剩余容量百分比和理论剩余能量的对应关系,得到所述理论剩余能量。
- 根据权利要求8所述的估算装置,其特征在于,所述第二获取模块具体用于:获取所述电池在当前时刻之前的所述设定时间内的放电倍率;获取所述电池在当前时刻之后的单位时间后的预测温度;根据所述放电倍率和所述预测温度,得到所述放电能量比率。
- 一种车辆,其特征在于,包括:如权利要求8-10任一项所述的电池剩余能量的估算装置。
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CN110488198A (zh) * | 2019-09-26 | 2019-11-22 | 广州小鹏汽车科技有限公司 | 电池剩余能量的估算方法、装置及车辆 |
CN112034351A (zh) * | 2020-08-28 | 2020-12-04 | 厦门科灿信息技术有限公司 | 电池剩余容量确定方法及终端设备 |
CN113125967B (zh) * | 2021-04-07 | 2023-04-28 | 力高(山东)新能源技术股份有限公司 | 一种基于温升预测的锂电池soe计算方法 |
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