WO2019024787A1 - Discharge control method and device for power battery, controller, and automobile - Google Patents

Discharge control method and device for power battery, controller, and automobile Download PDF

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Publication number
WO2019024787A1
WO2019024787A1 PCT/CN2018/097473 CN2018097473W WO2019024787A1 WO 2019024787 A1 WO2019024787 A1 WO 2019024787A1 CN 2018097473 W CN2018097473 W CN 2018097473W WO 2019024787 A1 WO2019024787 A1 WO 2019024787A1
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WIPO (PCT)
Prior art keywords
power battery
state
charge
power
value
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PCT/CN2018/097473
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French (fr)
Chinese (zh)
Inventor
唐磊
代康伟
张骞慧
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北京新能源汽车股份有限公司
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Publication of WO2019024787A1 publication Critical patent/WO2019024787A1/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
    • 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

Definitions

  • the present disclosure relates to the field of battery management technologies, and in particular, to a discharge control method, device, controller, and automobile for a power battery.
  • Embodiments of the present disclosure provide a discharge control method for a power battery, including:
  • the power battery When the power battery enters the discharge state from the initial state, the power battery is discharged to a state of charge to a preset reference value, and the preset reference value indicates that the power battery starts to discharge from the state of charge to 100%.
  • the power battery When the state of charge of the power battery reaches the preset reference value, the power battery is controlled to discharge until it is completely discharged.
  • the step of controlling the power battery to discharge to a charged state to reach a preset reference value includes:
  • the original ampere-hour integral formula is adopted. Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state
  • SOC 0 represents a charge of the power battery when in the initial state
  • ⁇ represents the charging and discharging efficiency of the power battery
  • C represents the rated capacity of the power battery
  • I represents the current of the power battery
  • the method before the step of controlling the power battery to discharge until it is completely discharged, the method further includes:
  • the power correspondence table corrects the value of the state of charge of the power battery.
  • the charging state of the power battery is corrected according to the obtained maximum allowable discharge power of the power battery and the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery.
  • the steps of the value include:
  • the state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
  • the step of controlling the power battery to discharge until it is completely discharged includes:
  • the accumulated value of the amount of power discharged by the power battery is cleared, and the value of the state of charge of the power battery is decreased by first. a predetermined amount, obtaining a target value of a state of charge of the power battery, and searching for a power corresponding to the target value from a correspondence table between a predetermined value of the state of charge and a maximum allowable discharge power of the power battery The maximum allowable discharge power of the battery, and adjust the maximum allowable discharge power of the power battery at this moment to the maximum allowable discharge power of the power battery corresponding to the target value;
  • the value of the state of charge of the power battery is decreased by a second predetermined amount until the state of charge of the power battery The value reaches zero.
  • the preset reference value is determined according to power characteristics and capacity characteristics of the power battery.
  • the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery;
  • An embodiment of the present disclosure further provides a discharge control device for a power battery, including:
  • a first discharge control module configured to control the power battery to discharge to a preset state when the power battery enters a discharge state from an initial state, wherein the preset reference value indicates that the power battery is from a state of charge The value of the state of charge after 100% of the power consumption required to satisfy the vehicle is started to be released;
  • the second discharge control module is configured to control the power battery to discharge until it is completely discharged when the state of charge of the power battery reaches the preset reference value.
  • the first discharge control module includes:
  • a first detecting unit configured to adopt an original ampere-hour integral formula according to the first preset period Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state
  • SOC 0 represents a charge of the power battery when in the initial state
  • ⁇ represents the charging and discharging efficiency of the power battery
  • C represents the rated capacity of the power battery
  • I represents the current of the power battery
  • a first processing unit configured to reduce the maximum allowable discharge power of the power battery to the Nth preset value when the Nth lowest voltage of the power battery is detected to be lower than the discharge cutoff voltage, and according to the first
  • the Nth hour integral formula is used for the preset period Estimating the state of charge of the power battery until the state of charge of the power battery reaches the preset reference value, wherein SOC N indicates that the lowest voltage of the cell of the power battery is detected to be less than the discharge cutoff at the Nth time At the time of voltage, the value of the state of charge of the power battery, N is an integer greater than 0, and k N is a constant greater than one.
  • the device further includes:
  • a correction module configured to: when the power battery is discharged from the initial state to a state in which the state of charge reaches the preset reference value, if it is detected that a minimum voltage of the power battery is less than a discharge cutoff voltage, When the state of charge of the power battery reaches the preset reference value, the maximum allowable discharge power of the power battery at the moment is obtained, and according to the obtained maximum allowable discharge power of the power battery, and the value of the predetermined state of charge and The correspondence table of the maximum allowable discharge power of the power battery is used to correct the value of the state of charge of the power battery.
  • the correction module comprises:
  • a look-up unit for finding a value of a state of charge corresponding to the maximum allowable discharge power of the obtained power battery from a correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, and a correction value as a state of charge of the power battery;
  • a second processing unit configured to control the power battery to continue discharging from the state of charge to the preset standard value, and adopt a preset ampere-hour integral formula according to the first preset period
  • the state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
  • the second discharge control module comprises:
  • a second detecting unit configured to detect, according to a second preset period, whether a minimum voltage of the power battery is less than a discharge cutoff voltage, and detecting whether the power discharged by the power battery reaches an integral multiple of a preset standard value
  • a third processing unit configured to clear the accumulated value of the amount of power discharged by the power battery every time the minimum voltage of the power battery is detected to be less than the discharge cutoff voltage, and charge the power battery
  • the value of the state is decreased by the first preset amount, the target value of the state of charge of the power battery is obtained, and the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery is searched.
  • a maximum allowable discharge power of the power battery corresponding to the target value and adjusting a maximum allowable discharge power of the power battery at the moment to a maximum allowable discharge power of the power battery corresponding to the target value;
  • a fourth processing unit configured to reduce a value of a state of charge of the power battery by a second predetermined amount each time the amount of power discharged by the power battery reaches an integral multiple of the preset standard value; The value of the state of charge of the power battery reaches zero.
  • the preset reference value is determined according to power characteristics and capacity characteristics of the power battery.
  • the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery;
  • the lookup unit is specifically configured to:
  • Embodiments of the present disclosure also provide a controller including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor reading a program in the memory The steps in the discharge control method of the power battery as described above are performed.
  • Embodiments of the present disclosure also provide an automobile including the controller described above.
  • FIG. 1 is a flow chart showing a discharge control method of a power battery according to an embodiment of the present disclosure
  • FIG. 2 is a flow chart showing a specific implementation of a discharge control method for a power battery according to an embodiment of the present disclosure
  • FIG. 3 is a block diagram showing the structure of a discharge control device for a power battery according to an embodiment of the present disclosure
  • FIG. 4 is a block diagram showing the structure of a discharge control device for a power battery according to an embodiment of the present disclosure.
  • Embodiments of the present disclosure provide a discharge control method for a power battery, as shown in FIG. 1, the method includes:
  • Step 101 When the power battery enters the discharge state from the initial state, the power battery is controlled to discharge to a state of charge to reach a preset reference value.
  • the preset reference value indicates a value of a state of charge of the power battery after the power state is 100% and the power state required to satisfy the vehicle is released. Further, the preset reference value is determined according to power characteristics and capacity characteristics of the power battery.
  • step 101 is specifically: acquiring an ambient temperature at which the power battery is located, and controlling the power battery to discharge to a state of charge to reach a pre-corresponding to the ambient temperature when the power battery enters a discharge state from an initial state. Set the reference value.
  • the initial state is a state in which the value of the state of charge of the power battery is greater than the state of the preset reference. That is, the power battery can start discharging from any value of the state of the charging state that is greater than a preset reference value.
  • the step of controlling the power battery to discharge to a charged state to reach a preset reference value includes:
  • the original ampere-hour integral formula is adopted. Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state
  • SOC 0 represents a charge of the power battery when in the initial state
  • ⁇ represents the charging and discharging efficiency of the power battery
  • C represents the rated capacity of the power battery
  • I represents the current of the power battery
  • the original ampere-hour integral formula when the power battery starts to discharge from the initial state, the original ampere-hour integral formula is used to periodically estimate the state of charge of the power battery, and periodically detect whether the lowest voltage of the power battery is less than the discharge cut-off. Voltage. When it is detected that the minimum voltage of the power battery is less than the discharge cut-off voltage, the original ampere-hour integral formula is used to periodically estimate the state of charge of the power battery, and the "acceleration ampere-hour integral formula" is used for periodic estimation. At the same time reduce the maximum allowable discharge power of the power battery.
  • the specific parameters in the "acceleration ampere-hour integral formula" used are different each time the minimum voltage of the cell of the power battery is detected to be less than the discharge cut-off voltage. For example, when the lowest voltage of the cell of the power battery is detected for the first time is less than the discharge cutoff voltage, the formula for estimating the state of charge is the first ampere-hour integral formula. When the second lowest voltage of the power battery is detected to be less than the discharge cut-off voltage, the first ampere-hour integral formula is stopped for estimation, and the second ampere-hour integral formula is adopted. Make an estimate.
  • the amount of decrease in the maximum allowable discharge power of the power battery may be different each time the minimum voltage of the cell of the power battery is detected to be less than the discharge cutoff voltage.
  • the process of controlling the power battery to discharge to a charged state to reach a preset reference value is as follows:
  • the original ampere-hour integral formula is adopted.
  • the state of charge of the power battery is estimated, and whether the lowest cell voltage of the power battery is less than the discharge cutoff voltage is detected according to a second preset period.
  • the maximum allowable discharge power of the power battery is lowered by X1
  • the original state of charge integral is used to estimate the state of charge of the power battery.
  • the maximum allowable discharge power of the power battery will be decreased by X2, and the first hourly integral formula is used to estimate the power battery.
  • the state of charge, but the second ampere-hour integral formula Estimating the state of charge of the power battery... The discharge is continued in accordance with the above process until the state of charge of the power battery reaches a preset reference value.
  • the first preset period and the second preset period may be calibrated according to actual conditions.
  • T 1 is the second predetermined period
  • T 2 is the second predetermined period
  • the first single minimum voltage is detected battery voltage is less than the discharge cutoff
  • the second period of T 2 arrives, it is just within the second period of T 1 , then the first ampere-hour integral formula is used.
  • SOC 1 can directly adopt the state of charge estimated by the original integral formula when the first cycle of T 1 arrives. Since the time of the first preset period and the second preset period are both short and are in the millisecond level, even if the above situation occurs, the estimation of the state of charge does not cause a large error.
  • the embodiment of the present disclosure reaches the preset reference value when the power battery is discharged from the initial state to the state of charge. In the process, only the ampere-time integral method is used to periodically estimate the state of charge of the power battery, and the state of charge of the power battery during this discharge phase can be accurately estimated.
  • Step 102 When the state of charge of the power battery reaches the preset reference value, the power battery is controlled to discharge until it is completely discharged.
  • the lowest voltage of the power battery may be less than the discharge cutoff voltage.
  • the minimum voltage of the power battery is raised, thereby no longer being smaller than the discharge cutoff voltage, thereby eliminating the power battery. Overdraft situation.
  • the power battery may be discharged to a preset reference value, and the remaining battery power has a certain deviation from the preset reference value. Therefore, in order to calibrate the deviation caused by the above situation, before step 102, the method further includes:
  • the power correspondence table corrects the value of the state of charge of the power battery.
  • a correspondence table between the value of the state of charge of the power battery and the maximum allowable discharge power of the power battery is determined in advance, so that the process of discharging the power battery from the initial state to the state of charge reaches a preset reference value.
  • the state of charge can be calibrated according to the correspondence table.
  • SOP 0 is generally the minimum required power for the entire vehicle.
  • Steps including:
  • the state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
  • the power battery when the power battery is discharged from the initial state to the state where the state of charge reaches the preset reference value, when the minimum voltage of the power battery is lower than the discharge cutoff voltage, the power battery can be discharged to the state of charge to reach the preset state.
  • the theoretical value of the state of charge of the power battery at this time is obtained by looking up the table, and then the power battery is controlled to continue to discharge until the state of charge reaches the theoretical value.
  • the correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery; In the correspondence table between the determined value of the state of charge and the maximum allowable discharge power of the power battery, the value of the state of charge corresponding to the maximum allowable discharge power of the power battery is found, and is used as the charge of the power battery.
  • the steps of correcting the status including:
  • step 102 includes:
  • the accumulated value of the amount of power discharged by the power battery is cleared, and the value of the state of charge of the power battery is decreased by first. a predetermined amount, obtaining a target value of a state of charge of the power battery, and searching for a power corresponding to the target value from a correspondence table between a predetermined value of the state of charge and a maximum allowable discharge power of the power battery The maximum allowable discharge power of the battery, and adjust the maximum allowable discharge power of the power battery at this moment to the maximum allowable discharge power of the power battery corresponding to the target value;
  • the value of the state of charge of the power battery is decreased by a second predetermined amount until the state of charge of the power battery The value reaches zero.
  • the state of charge of the power battery is reduced by a first predetermined amount, and the accumulated value of the amount of power discharged by the power battery is cleared (ie, the calculation is restarted) The amount of discharge), and before the accumulated value of the amount of power discharged from the power battery is not cleared, the state of charge of the power battery is decreased by the second predetermined amount as long as the discharged amount reaches the preset standard value.
  • the first preset amount and the second preset amount may be calibrated according to actual conditions.
  • the preset standard value is ⁇ x
  • the power discharged by the power battery has not reached ⁇ x
  • the cutoff voltage reduces the state of charge of the power battery by 1% and restarts the calculation of the battery discharge.
  • the power battery is sequentially turned on as long as it is detected that the recalculated power battery discharge amount reaches ⁇ x, 2 ⁇ x, 3 ⁇ x, ...
  • the state of charge is reduced by 1%.
  • the maximum allowable discharge power of the current power battery is required whenever the minimum voltage of the power battery is lower than the discharge cutoff voltage.
  • the calibration is performed, that is, according to the correspondence between the value of the state of charge of the power battery at that time and the value of the predetermined state of charge and the maximum allowable discharge power of the power battery.
  • the correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery;
  • the steps of finding the maximum allowable discharge power of the power battery corresponding to the target value include:
  • the discharge process of the power battery is mainly divided into two stages: the process from the initial state discharge to the state of charge reaching the preset reference value is the first stage, and the state of charge is preset.
  • the process in which the reference value begins to discharge until the state of charge is zero is the second stage.
  • the embodiment of the present disclosure continuously estimates the state of charge of the power battery, thereby providing data support for evaluating the remaining battery life of the electric vehicle, thereby ensuring normal driving of the vehicle.
  • the power battery when the minimum voltage of the power battery is lower than the discharge cut-off voltage, the power battery is over-discharged.
  • the power battery during the entire discharge process of the power battery, by periodically detecting whether the minimum voltage of the single cell of the power battery is less than the discharge cutoff voltage, the power battery can be prevented from being over-discharged, thereby prolonging the service life.
  • the preset reference value Xn% of the SOC is selected according to the capacity performance and the power performance of the power battery in each temperature range, that is, the SOC-100% discharge to the SOC-Xn%, Meet the demand of the whole vehicle; SOC-Xn% discharge to SOC-0%, can release the remaining power of the battery pack, fully utilize the power battery capacity, and also accurately estimate the SOC through the hourly integration method, and this
  • the discharge control method of the power battery of the disclosed embodiment has a strong adaptability to the consistency of the battery.
  • An embodiment of the present disclosure further provides a discharge control device for a power battery.
  • the discharge control device 300 of the power battery includes:
  • the first discharge control module 301 is configured to control the power battery to discharge to a preset state when the power battery enters a discharge state from an initial state, where the preset reference value indicates that the power battery is charged
  • the value of the state of charge after the state is 100% to start discharging the power required by the vehicle;
  • the second discharge control module 303 is configured to control the power battery to discharge until it is completely discharged when the state of charge of the power battery reaches the preset reference value.
  • the first discharge control module 301 includes:
  • the first detecting unit 3011 is configured to adopt an original ampere-hour integral formula according to the first preset period. Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state
  • SOC 0 represents a charge of the power battery when in the initial state
  • the value of the electrical state, ⁇ represents the charging and discharging efficiency of the power battery, C represents the rated capacity of the power battery, and I represents the current of the power battery;
  • the first processing unit 3012 is configured to: when the Nth lowest voltage of the power battery is detected to be lower than the discharge cutoff voltage, reduce the maximum allowable discharge power of the power battery to the Nth preset value, and according to the The Nth hour integral formula is used for a preset period Dt estimating the state of charge of the power battery until the state of charge of the power battery reaches the preset reference value, wherein SOC N indicates that the lowest voltage of the cell of the power battery detected by the Nth time is less than discharge At the time of the cutoff voltage, the value of the state of charge of the power battery, N is an integer greater than 0, and k N is a constant greater than one.
  • the apparatus further includes:
  • a correction module 302 configured to: when the power battery is discharged from the initial state to a state in which the state of charge reaches the preset reference value, if it is detected that a minimum voltage of the power battery is less than a discharge cutoff voltage, When the state of charge of the power battery reaches the preset reference value, the maximum allowable discharge power of the power battery at the moment is obtained, and according to the obtained maximum allowable discharge power of the power battery, and the value of the predetermined state of charge The value of the state of charge of the power battery is corrected by a correspondence table with the maximum allowable discharge power of the power battery.
  • the modification module 302 includes:
  • the look-up table unit 3021 is configured to search for a value of a state of charge corresponding to the obtained maximum allowable discharge power of the power battery from a correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery. And as a correction value of the state of charge of the power battery;
  • a second processing unit 3022 configured to control the power battery to continue discharging from the state of charge to the preset standard value, and adopt a preset ampere-hour integral formula according to the first preset period
  • the state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
  • the second discharge control module 303 includes:
  • the second detecting unit 3031 is configured to detect, according to the second preset period, whether the lowest voltage of the power battery is less than a discharge cutoff voltage, and detect whether the power discharged by the power battery reaches an integral multiple of a preset standard value;
  • the third processing unit 3032 is configured to clear the accumulated value of the amount of power discharged by the power battery every time the minimum voltage of the power battery is detected to be less than the discharge cutoff voltage, and the charge of the power battery
  • the value of the electrical state is decreased by a first predetermined amount, the target value of the state of charge of the power battery is obtained, and from the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, Finding a maximum allowable discharge power of the power battery corresponding to the target value, and adjusting a maximum allowable discharge power of the power battery at the moment to a maximum allowable discharge power of the power battery corresponding to the target value;
  • the fourth processing unit 3033 is configured to reduce the value of the state of charge of the power battery by a second predetermined amount each time the amount of power discharged by the power battery reaches an integral multiple of the preset standard value. Until the value of the state of charge of the power battery reaches zero.
  • the preset reference value is determined according to power characteristics and capacity characteristics of the power battery.
  • the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery;
  • the look-up table unit 3021 is specifically configured to:
  • the embodiment of the present disclosure can control the power battery to discharge from the initial state to the state of charge to reach a preset reference value, thereby satisfying the power demand of the entire vehicle, and when the state of charge of the power battery reaches a preset reference value. It is also possible to further control the power battery to continue to discharge until all the remaining power is discharged, so as to be used by the automobile. Therefore, in the embodiments of the present disclosure, the power supply capability of the power battery can be fully utilized, thereby solving the problem that the power battery in the related art may be partially uncharged and cannot be used, thereby causing waste of power.
  • Embodiments of the present disclosure also provide a controller including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor reading a program in the memory The steps in the discharge control method of the power battery as described above are performed.
  • Embodiments of the present disclosure also provide an automobile including the controller described above.

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Abstract

Provided are a discharge control method and device for a power battery, a controller, and an automobile. The discharge control method for a power battery comprises: when a power battery enters a discharge state from an initial state, controlling the power battery to discharge until a state of charge thereof reaches a preset reference value, the preset reference value indicating a state of charge after the power battery has discharged a given quantity of electricity required for an automobile from a state of charge of 100%<u>;</u> and when the state of charge of the power battery reaches the preset reference value, controlling the power battery to discharge until all electricity has been discharged.

Description

动力电池的放电控制方法、装置、控制器及汽车Discharge control method, device, controller and automobile for power battery
相关申请的交叉引用Cross-reference to related applications
本申请主张在2017年7月31日在中国提交的中国专利申请号No.201710640824.9的优先权，其全部内容通过引用包含于此。The present application claims priority to Chinese Patent Application No. JP-A No. No. No. No. No. No. No. No. No. No.
技术领域Technical field
本公开涉及电池管理技术领域，尤其涉及一种动力电池的放电控制方法、装置、控制器及汽车。The present disclosure relates to the field of battery management technologies, and in particular, to a discharge control method, device, controller, and automobile for a power battery.
背景技术Background technique
动力电池作为电动汽车的动力来源，直接影响着电动汽车的动力性和续航能力。然而，由于目前国内电池厂在组包工艺、电芯品控方面有所欠缺，导致电池包内电芯的一致性差异较大以及不同电池包之间的一致性差异较大。因而，为了解决电池包的一致性问题，相关技术中往往要求电池包的实际可用电量远大于整车需求的电量，从而导致不同电池包在放出满足整车需求的电量之后，还会遗留部分电量而无法使用，从而造成了电量浪费的问题。As the power source of electric vehicles, power batteries directly affect the power and endurance of electric vehicles. However, due to the current lack of battery pack technology and battery quality control in domestic battery factories, the consistency of battery cells in battery packs is quite different and the consistency between different battery packs is quite different. Therefore, in order to solve the problem of consistency of the battery pack, the related art often requires that the actual available power of the battery pack is much larger than the power demanded by the whole vehicle, so that after the battery packs discharge the power that meets the demand of the whole vehicle, some power remains. It can't be used, which causes a waste of power.
发明内容Summary of the invention
本公开的实施例提供了一种动力电池的放电控制方法，包括：Embodiments of the present disclosure provide a discharge control method for a power battery, including:
当动力电池从初始状态进入放电状态时，控制所述动力电池放电到荷电状态达到预设基准值，所述预设基准值表示所述动力电池从荷电状态为100％开始放出满足整车所需的电量之后的荷电状态的取值；When the power battery enters the discharge state from the initial state, the power battery is discharged to a state of charge to a preset reference value, and the preset reference value indicates that the power battery starts to discharge from the state of charge to 100%. The value of the state of charge after the required amount of power;
当所述动力电池的荷电状态达到所述预设基准值时，控制所述动力电池放电至完全放电为止。When the state of charge of the power battery reaches the preset reference value, the power battery is controlled to discharge until it is completely discharged.
其中，上述方案中，所述控制所述动力电池放电到荷电状态达到预设基准值的步骤，包括：In the above solution, the step of controlling the power battery to discharge to a charged state to reach a preset reference value includes:
按照第一预设周期，采用原始安时积分公式
Figure PCTCN2018097473-appb-000001
估算所述动力电池的荷电状态，并按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，其中，SOC 0表示所述动力电池处于所述初始状态时的荷电状态的取值，η表示所述动力电池的充放电效率，C表示所述动力电池的额定容量，I表示所述动力电池的电流； According to the first preset period, the original ampere-hour integral formula is adopted.
Figure PCTCN2018097473-appb-000001
Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state The value of the electrical state, η represents the charging and discharging efficiency of the power battery, C represents the rated capacity of the power battery, and I represents the current of the power battery;
当第N次检测到所述动力电池的单体最低电压小于放电截止电压时，将此刻的动力电池最大允许放电功率降低第N预设值，并按照所述第一预设周期采用第N安时积分公式
Figure PCTCN2018097473-appb-000002
估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述预设基准值为止，其中，SOC N表示第N次检测到所述动力电池的单体最低电压小于放电截止电压时，所述动力电池的荷电状态的取值，N为大于0的整数，k N为大于1的常量。 When the Nth lowest voltage of the power battery is detected to be less than the discharge cutoff voltage, the maximum allowable discharge power of the power battery is lowered to the Nth preset value, and the Nth safety is adopted according to the first preset period. Time integral formula
Figure PCTCN2018097473-appb-000002
Estimating the state of charge of the power battery until the state of charge of the power battery reaches the preset reference value, wherein SOC N indicates that the lowest voltage of the cell of the power battery is detected to be less than the discharge cutoff at the Nth time At the time of voltage, the value of the state of charge of the power battery, N is an integer greater than 0, and k N is a constant greater than one.
其中，上述方案中，所述控制所述动力电池放电至完全放电为止的步骤之前，所述方法还包括：In the above solution, before the step of controlling the power battery to discharge until it is completely discharged, the method further includes:
在所述动力电池从所述初始状态放电到荷电状态达到所述预设基准值的过程中，若检测到所述动力电池的单体最低电压小于放电截止电压，则在所述动力电池的荷电状态达到所述预设基准值时，获取此刻的动力电池最大允许放电功率，并根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述动力电池的荷电状态的取值。And in the process of discharging the power battery from the initial state to the state of charge reaching the preset reference value, if it is detected that the lowest voltage of the cell of the power battery is less than the discharge cutoff voltage, then in the power battery When the state of charge reaches the preset reference value, the maximum allowable discharge power of the power battery at the moment is obtained, and according to the obtained maximum allowable discharge power of the power battery, and the value of the predetermined state of charge and the maximum allowable discharge of the power battery. The power correspondence table corrects the value of the state of charge of the power battery.
其中，上述方案中，所述根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述动力电池的荷电状态的取值的步骤，包括：Wherein, in the above solution, the charging state of the power battery is corrected according to the obtained maximum allowable discharge power of the power battery and the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery. The steps of the value include:
从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值；Finding a value of a state of charge corresponding to the maximum allowable discharge power of the power battery from the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, and as the power battery Correction value of the state of charge;
控制所述动力电池从所述荷电状态为所述预设标准值开始继续放电，并按照所述第一预设周期，采用预设安时积分公式
Figure PCTCN2018097473-appb-000003
Figure PCTCN2018097473-appb-000004
估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述修正值为止，其中，SOC Y表示所述预设基准值，k为大于1的常量。 Controlling the power battery to continue discharging from the state of charge to the preset standard value, and adopting a preset ampere-hour integral formula according to the first preset period
Figure PCTCN2018097473-appb-000003
Figure PCTCN2018097473-appb-000004
The state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
其中，上述方案中，所述控制所述动力电池放电至完全放电为止的步骤，包括：In the above solution, the step of controlling the power battery to discharge until it is completely discharged includes:
按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，并检测所述动力电池放出的电量是否达预设标准值的整数倍；Detecting whether the lowest voltage of the single cell of the power battery is less than the discharge cutoff voltage according to the second preset period, and detecting whether the power discharged by the power battery reaches an integral multiple of a preset standard value;
每当检测到所述动力电池的单体最低电压小于放电截止电压时，将所述动力电池放出的电量的累计值清零，并将所述动力电池的荷电状态的取值减小第一预设量，获得所述动力电池的荷电状态的目标值，并从预先确定的荷 电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与所述目标值对应的动力电池最大允许放电功率，并将此刻动力电池最大允许放电功率调节到与所述目标值对应的动力电池最大允许放电功率；Whenever the minimum voltage of the cell of the power battery is detected to be less than the discharge cutoff voltage, the accumulated value of the amount of power discharged by the power battery is cleared, and the value of the state of charge of the power battery is decreased by first. a predetermined amount, obtaining a target value of a state of charge of the power battery, and searching for a power corresponding to the target value from a correspondence table between a predetermined value of the state of charge and a maximum allowable discharge power of the power battery The maximum allowable discharge power of the battery, and adjust the maximum allowable discharge power of the power battery at this moment to the maximum allowable discharge power of the power battery corresponding to the target value;
每当所述动力电池放出的电量达到所述预设标准值的整数倍时，将所述动力电池的荷电状态的取值减小第二预设量，直到所述动力电池的荷电状态的取值达到零为止。Whenever the amount of power discharged by the power battery reaches an integral multiple of the preset standard value, the value of the state of charge of the power battery is decreased by a second predetermined amount until the state of charge of the power battery The value reaches zero.
其中，上述方案中，所述预设基准值是根据所述动力电池的功率特性和容量特性确定的。Wherein, in the above solution, the preset reference value is determined according to power characteristics and capacity characteristics of the power battery.
其中，上述方案中，预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表包括不同温度范围下的荷电状态与动力电池最大允许放电功率的对应关系表；Wherein, in the above solution, the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery;
所述从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值的步骤，包括：In the correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, searching for the value of the state of charge corresponding to the maximum allowable discharge power of the obtained power battery, and using the power as the power The steps of correcting the state of charge of the battery include:
获取所述动力电池所处的环境温度，并在所述环境温度所处的温度范围对应的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值。Obtaining the ambient temperature at which the power battery is located, and searching and acquiring the power battery in a correspondence table between the value of the state of charge corresponding to the temperature range in which the ambient temperature is located and the maximum allowable discharge power of the power battery The value of the state of charge corresponding to the maximum allowable discharge power is used as a correction value of the state of charge of the power battery.
本公开的实施例还提供了一种动力电池的放电控制装置，包括：An embodiment of the present disclosure further provides a discharge control device for a power battery, including:
第一放电控制模块，用于当动力电池从初始状态进入放电状态时，控制所述动力电池放电到荷电状态达到预设基准值，所述预设基准值表示所述动力电池从荷电状态为100％开始放出满足整车所需的电量之后的荷电状态的取值；a first discharge control module, configured to control the power battery to discharge to a preset state when the power battery enters a discharge state from an initial state, wherein the preset reference value indicates that the power battery is from a state of charge The value of the state of charge after 100% of the power consumption required to satisfy the vehicle is started to be released;
第二放电控制模块，用于当所述动力电池的荷电状态达到所述预设基准值时，控制所述动力电池放电至完全放电为止。The second discharge control module is configured to control the power battery to discharge until it is completely discharged when the state of charge of the power battery reaches the preset reference value.
其中，上述方案中，所述第一放电控制模块包括：Wherein, in the above solution, the first discharge control module includes:
第一检测单元，用于按照第一预设周期，采用原始安时积分公式
Figure PCTCN2018097473-appb-000005
估算所述动力电池的荷电状态，并按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，其中，SOC 0表示所述动力电池处于所述初始状态时的荷电状态的取值，η表示所述动力电池的充放电效率，C表示所述动力电池的额定容量，I表示所述动力电池的电流； a first detecting unit, configured to adopt an original ampere-hour integral formula according to the first preset period
Figure PCTCN2018097473-appb-000005
Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state The value of the electrical state, η represents the charging and discharging efficiency of the power battery, C represents the rated capacity of the power battery, and I represents the current of the power battery;
第一处理单元，用于当第N次检测到所述动力电池的单体最低电压小于放电截止电压时，将此刻的动力电池最大允许放电功率降低第N预设值，并 按照所述第一预设周期采用第N安时积分公式
Figure PCTCN2018097473-appb-000006
Figure PCTCN2018097473-appb-000007
估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述预设基准值为止，其中，SOC N表示第N次检测到所述动力电池的单体最低电压小于放电截止电压时，所述动力电池的荷电状态的取值，N为大于0的整数，k N为大于1的常量。 a first processing unit, configured to reduce the maximum allowable discharge power of the power battery to the Nth preset value when the Nth lowest voltage of the power battery is detected to be lower than the discharge cutoff voltage, and according to the first The Nth hour integral formula is used for the preset period
Figure PCTCN2018097473-appb-000006
Figure PCTCN2018097473-appb-000007
Estimating the state of charge of the power battery until the state of charge of the power battery reaches the preset reference value, wherein SOC N indicates that the lowest voltage of the cell of the power battery is detected to be less than the discharge cutoff at the Nth time At the time of voltage, the value of the state of charge of the power battery, N is an integer greater than 0, and k N is a constant greater than one.
其中，上述方案中，所述装置还包括：Wherein, in the above solution, the device further includes:
修正模块，用于在所述动力电池从所述初始状态放电到荷电状态达到所述预设基准值的过程中，若检测到所述动力电池的单体最低电压小于放电截止电压，则在所述动力电池的荷电状态达到所述预设基准值时，获取此刻的动力电池最大允许放电功率，并根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述动力电池的荷电状态的取值。a correction module, configured to: when the power battery is discharged from the initial state to a state in which the state of charge reaches the preset reference value, if it is detected that a minimum voltage of the power battery is less than a discharge cutoff voltage, When the state of charge of the power battery reaches the preset reference value, the maximum allowable discharge power of the power battery at the moment is obtained, and according to the obtained maximum allowable discharge power of the power battery, and the value of the predetermined state of charge and The correspondence table of the maximum allowable discharge power of the power battery is used to correct the value of the state of charge of the power battery.
其中，上述方案中，所述修正模块包括：Wherein, in the above solution, the correction module comprises:
查表单元，用于从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值；a look-up unit for finding a value of a state of charge corresponding to the maximum allowable discharge power of the obtained power battery from a correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, and a correction value as a state of charge of the power battery;
第二处理单元，用于控制所述动力电池从所述荷电状态为所述预设标准值开始继续放电，并按照所述第一预设周期，采用预设安时积分公式
Figure PCTCN2018097473-appb-000008
估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述修正值为止，其中，SOC Y表示所述预设基准值，k为大于1的常量。 a second processing unit, configured to control the power battery to continue discharging from the state of charge to the preset standard value, and adopt a preset ampere-hour integral formula according to the first preset period
Figure PCTCN2018097473-appb-000008
The state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
其中，上述方案中，所述第二放电控制模块包括：Wherein, in the above solution, the second discharge control module comprises:
第二检测单元，用于按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，并检测所述动力电池放出的电量是否达预设标准值的整数倍；a second detecting unit, configured to detect, according to a second preset period, whether a minimum voltage of the power battery is less than a discharge cutoff voltage, and detecting whether the power discharged by the power battery reaches an integral multiple of a preset standard value;
第三处理单元，用于在每当检测到所述动力电池的单体最低电压小于放电截止电压时，将所述动力电池放出的电量的累计值清零，并将所述动力电池的荷电状态的取值减小第一预设量，获得所述动力电池的荷电状态的目标值，并从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与所述目标值对应的动力电池最大允许放电功率，并将此刻动力电池最大允许放电功率调节到与所述目标值对应的动力电池最大允许放电功率；a third processing unit, configured to clear the accumulated value of the amount of power discharged by the power battery every time the minimum voltage of the power battery is detected to be less than the discharge cutoff voltage, and charge the power battery The value of the state is decreased by the first preset amount, the target value of the state of charge of the power battery is obtained, and the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery is searched. a maximum allowable discharge power of the power battery corresponding to the target value, and adjusting a maximum allowable discharge power of the power battery at the moment to a maximum allowable discharge power of the power battery corresponding to the target value;
第四处理单元，用于在每当所述动力电池放出的电量达到所述预设标准 值的整数倍时，将所述动力电池的荷电状态的取值减小第二预设量，直到所述动力电池的荷电状态的取值达到零为止。a fourth processing unit, configured to reduce a value of a state of charge of the power battery by a second predetermined amount each time the amount of power discharged by the power battery reaches an integral multiple of the preset standard value; The value of the state of charge of the power battery reaches zero.
其中，上述方案中，所述预设基准值是根据所述动力电池的功率特性和容量特性确定的。Wherein, in the above solution, the preset reference value is determined according to power characteristics and capacity characteristics of the power battery.
其中，上述方案中，预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表包括不同温度范围下的荷电状态与动力电池最大允许放电功率的对应关系表；Wherein, in the above solution, the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery;
所述查表单元具体用于：The lookup unit is specifically configured to:
获取所述动力电池所处的环境温度，并在所述环境温度所处的温度范围对应的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值。Obtaining the ambient temperature at which the power battery is located, and searching and acquiring the power battery in a correspondence table between the value of the state of charge corresponding to the temperature range in which the ambient temperature is located and the maximum allowable discharge power of the power battery The value of the state of charge corresponding to the maximum allowable discharge power is used as a correction value of the state of charge of the power battery.
本公开的实施例还提供了一种控制器，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器读取所述存储器中的程序，执行如上述所述的动力电池的放电控制方法中的步骤。Embodiments of the present disclosure also provide a controller including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor reading a program in the memory The steps in the discharge control method of the power battery as described above are performed.
本公开的实施例还提供了一种汽车，包括上述所述的控制器。Embodiments of the present disclosure also provide an automobile including the controller described above.
附图说明DRAWINGS
为了更清楚地说明本公开实施例的技术方案，下面将对本公开实施例的描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings to be used in the description of the embodiments of the present disclosure will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present disclosure. Other drawings may also be obtained from those of ordinary skill in the art based on these drawings without the inventive labor.
图1表示本公开实施例的动力电池的放电控制方法的流程图；1 is a flow chart showing a discharge control method of a power battery according to an embodiment of the present disclosure;
图2表示本公开实施例的动力电池的放电控制方法具体实施时的流程图；2 is a flow chart showing a specific implementation of a discharge control method for a power battery according to an embodiment of the present disclosure;
图3表示本公开实施例的动力电池的放电控制装置的结构框图之一；3 is a block diagram showing the structure of a discharge control device for a power battery according to an embodiment of the present disclosure;
图4表示本公开实施例的动力电池的放电控制装置的结构框图之二。4 is a block diagram showing the structure of a discharge control device for a power battery according to an embodiment of the present disclosure.
具体实施方式Detailed ways
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开一部分实施例，而不是全部的实施例。基于本公开中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。The technical solutions in the embodiments of the present disclosure are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present disclosure. It is obvious that the described embodiments are a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.
本公开的实施例提供了一种动力电池的放电控制方法，如图1所示，该 方法包括：Embodiments of the present disclosure provide a discharge control method for a power battery, as shown in FIG. 1, the method includes:
步骤101：当动力电池从初始状态进入放电状态时，控制所述动力电池放电到荷电状态达到预设基准值。Step 101: When the power battery enters the discharge state from the initial state, the power battery is controlled to discharge to a state of charge to reach a preset reference value.
其中，所述预设基准值表示所述动力电池从荷电状态为100％开始放出满足整车所需的电量之后的荷电状态的取值。进一步地，所述预设基准值是根据所述动力电池的功率特性和容量特性确定的。The preset reference value indicates a value of a state of charge of the power battery after the power state is 100% and the power state required to satisfy the vehicle is released. Further, the preset reference value is determined according to power characteristics and capacity characteristics of the power battery.
另外，在不同温度下，同一动力电池的预设基准值也会有所差别。因此，可以进一步根据动力电池的功率特性和容量特性，分别确定动力电池在不同温度范围下的预设基准值，从而在不同温度范围内，进一步充分发挥动力电池的供电能力。对应地，步骤101具体为：获取动力电池所处的环境温度，并当所述动力电池从初始状态进入放电状态时，控制所述动力电池放电到荷电状态达到与所述环境温度对应的预设基准值。In addition, the preset reference values of the same power battery will differ at different temperatures. Therefore, the preset reference value of the power battery under different temperature ranges can be further determined according to the power characteristics and the capacity characteristics of the power battery, so that the power supply capability of the power battery can be further fully utilized in different temperature ranges. Correspondingly, step 101 is specifically: acquiring an ambient temperature at which the power battery is located, and controlling the power battery to discharge to a state of charge to reach a pre-corresponding to the ambient temperature when the power battery enters a discharge state from an initial state. Set the reference value.
此外，所述初始状态为动力电池的荷电状态的取值大于所述预设基准时的状态。即动力电池可以从荷电状态的取值大于预设基准值的任意一个取值开始进行放电。In addition, the initial state is a state in which the value of the state of charge of the power battery is greater than the state of the preset reference. That is, the power battery can start discharging from any value of the state of the charging state that is greater than a preset reference value.
可选地，上述控制所述动力电池放电到荷电状态达到预设基准值的步骤，包括：Optionally, the step of controlling the power battery to discharge to a charged state to reach a preset reference value includes:
按照第一预设周期，采用原始安时积分公式
Figure PCTCN2018097473-appb-000009
估算所述动力电池的荷电状态，并按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，其中，SOC 0表示所述动力电池处于所述初始状态时的荷电状态的取值，η表示所述动力电池的充放电效率，C表示所述动力电池的额定容量，I表示所述动力电池的电流； According to the first preset period, the original ampere-hour integral formula is adopted.
Figure PCTCN2018097473-appb-000009
Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state The value of the electrical state, η represents the charging and discharging efficiency of the power battery, C represents the rated capacity of the power battery, and I represents the current of the power battery;
当第N次检测到所述动力电池的单体最低电压小于放电截止电压时，将此刻的动力电池最大允许放电功率降低第N预设值，并按照所述第一预设周期采用第N安时积分公式
Figure PCTCN2018097473-appb-000010
估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述预设基准值为止，其中，SOC N表示第N次检测到所述动力电池的单体最低电压小于放电截止电压时，所述动力电池的荷电状态的取值，N为大于0的整数，k N为大于1的常量。 When the Nth lowest voltage of the power battery is detected to be less than the discharge cutoff voltage, the maximum allowable discharge power of the power battery is lowered to the Nth preset value, and the Nth safety is adopted according to the first preset period. Time integral formula
Figure PCTCN2018097473-appb-000010
Estimating the state of charge of the power battery until the state of charge of the power battery reaches the preset reference value, wherein SOC N indicates that the lowest voltage of the cell of the power battery is detected to be less than the discharge cutoff at the Nth time At the time of voltage, the value of the state of charge of the power battery, N is an integer greater than 0, and k N is a constant greater than one.
即在本公开的实施例中，当动力电池从初始状态开始放电时，采用原始安时积分公式周期性估算动力电池的荷电状态，同时周期性检测动力电池的单体最低电压是否小于放电截止电压。而当检测到动力电池的单体最低电压小于放电截止电压时，则停止采用原始安时积分公式周期性估算动力电池的 荷电状态，而是采用“加速安时积分公式”进行周期性估算，同时降低动力电池最大允许放电功率。That is, in the embodiment of the present disclosure, when the power battery starts to discharge from the initial state, the original ampere-hour integral formula is used to periodically estimate the state of charge of the power battery, and periodically detect whether the lowest voltage of the power battery is less than the discharge cut-off. Voltage. When it is detected that the minimum voltage of the power battery is less than the discharge cut-off voltage, the original ampere-hour integral formula is used to periodically estimate the state of charge of the power battery, and the "acceleration ampere-hour integral formula" is used for periodic estimation. At the same time reduce the maximum allowable discharge power of the power battery.
其中，每一次检测到动力电池的单体最低电压小于放电截止电压时，所采用的“加速安时积分公式”中的具体参数不同。例如，第一次检测到动力电池的单体最低电压小于放电截止电压时，用于估算荷电状态的公式为第一安时积分公式
Figure PCTCN2018097473-appb-000011
而当第二次检测到动力电池的单体最低电压小于放电截止电压时，则停止采用上述第一安时积分公式进行估算，而是采用第二安时积分公式
Figure PCTCN2018097473-appb-000012
进行估算。 Among them, the specific parameters in the "acceleration ampere-hour integral formula" used are different each time the minimum voltage of the cell of the power battery is detected to be less than the discharge cut-off voltage. For example, when the lowest voltage of the cell of the power battery is detected for the first time is less than the discharge cutoff voltage, the formula for estimating the state of charge is the first ampere-hour integral formula.
Figure PCTCN2018097473-appb-000011
When the second lowest voltage of the power battery is detected to be less than the discharge cut-off voltage, the first ampere-hour integral formula is stopped for estimation, and the second ampere-hour integral formula is adopted.
Figure PCTCN2018097473-appb-000012
Make an estimate.
另外，在每一次检测到动力电池的单体最低电压小于放电截止电压时，对动力电池最大允许放电功率的减小量，也可以不同。In addition, the amount of decrease in the maximum allowable discharge power of the power battery may be different each time the minimum voltage of the cell of the power battery is detected to be less than the discharge cutoff voltage.
具体地，举例来说，上述控制动力电池放电到荷电状态达到预设基准值的过程如下：Specifically, for example, the process of controlling the power battery to discharge to a charged state to reach a preset reference value is as follows:
按照第一预设周期，采用原始安时积分公式
Figure PCTCN2018097473-appb-000013
估算所述动力电池的荷电状态，并按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压。其中，当第一次检测到动力电池的单体最低电压小于放电截止电压时，将此时动力电池最大允许放电功率降低X1，并停止采用原始安时积分公式估算动力电池的荷电状态，而是采用第一安时积分公式
Figure PCTCN2018097473-appb-000014
估算动力电池的荷电状态；若在后续的放电过程中，一直未检测到动力电池的单体最低电压小于放电截止电压，则一直采用上述第一安时积分公式估算动力电池的荷电状态，直到估算的荷电状态达到预设基准值为止。 According to the first preset period, the original ampere-hour integral formula is adopted.
Figure PCTCN2018097473-appb-000013
The state of charge of the power battery is estimated, and whether the lowest cell voltage of the power battery is less than the discharge cutoff voltage is detected according to a second preset period. Wherein, when the minimum voltage of the single cell of the power battery is detected to be less than the discharge cutoff voltage for the first time, the maximum allowable discharge power of the power battery is lowered by X1, and the original state of charge integral is used to estimate the state of charge of the power battery. Is the first ampere-hour integral formula
Figure PCTCN2018097473-appb-000014
Estimating the state of charge of the power battery; if during the subsequent discharge process, the minimum voltage of the cell of the power battery is not detected to be less than the discharge cutoff voltage, the first hourly integral formula is used to estimate the state of charge of the power battery. Until the estimated state of charge reaches the preset reference value.
然而，若后续第二次检测到动力电池的单体最低电压小于放电截止电压，则将继续将此时动力电池最大允许放电功率降低X2，并停止采用上述第一安时积分公式估算动力电池的荷电状态，而是采用第二安时积分公式
Figure PCTCN2018097473-appb-000015
估算动力电池的荷电状态……依照上述过程持续进行放电，直到动力电池的荷电状态达到预设基准值为止。 However, if the second lowest voltage of the power battery is detected to be less than the discharge cut-off voltage, the maximum allowable discharge power of the power battery will be decreased by X2, and the first hourly integral formula is used to estimate the power battery. The state of charge, but the second ampere-hour integral formula
Figure PCTCN2018097473-appb-000015
Estimating the state of charge of the power battery... The discharge is continued in accordance with the above process until the state of charge of the power battery reaches a preset reference value.
其中，上述第一预设周期和第二预设周期，可根据实际情况进行标定。The first preset period and the second preset period may be calibrated according to actual conditions.
另外，设第一预设周期为T 1，第二预设周期为T 2，若在T 2的第二个周期到达时，第一次检测到动力电池的单体最低电压小于放电截止电压，而T 2的第二个周期到达时，正好处于T 1的第二个周期之内，则此时采用第一安时积分公式
Figure PCTCN2018097473-appb-000016
估算所述动力电池的荷电状态时，SOC 1可直接采用T 1的第一个周期到达时采用原始积分公式估算的荷电状态。 而由于上述第一预设周期和第二预设周期的时间都比较短，均处于毫秒级，所以，即使出现上述情况，对荷电状态的估算也不会产生很大误差。 Further, provided is a first predetermined period T 1, T 2 is the second predetermined period, if the second period arrives T 2, the first single minimum voltage is detected battery voltage is less than the discharge cutoff, When the second period of T 2 arrives, it is just within the second period of T 1 , then the first ampere-hour integral formula is used.
Figure PCTCN2018097473-appb-000016
When estimating the state of charge of the power battery, SOC 1 can directly adopt the state of charge estimated by the original integral formula when the first cycle of T 1 arrives. Since the time of the first preset period and the second preset period are both short and are in the millisecond level, even if the above situation occurs, the estimation of the state of charge does not cause a large error.
此外，由于安时积分法在动力电池的单次充电或单次放电过程中具有很高的精度，所以，本公开的实施例在动力电池从初始状态放电到荷电状态达到预设基准值的过程中，只采用安时积分法周期性估算动力电池的荷电状态，可以准确估算动力电池在此放电阶段的荷电状态。In addition, since the ampere-time integration method has high precision in a single charge or a single discharge of the power battery, the embodiment of the present disclosure reaches the preset reference value when the power battery is discharged from the initial state to the state of charge. In the process, only the ampere-time integral method is used to periodically estimate the state of charge of the power battery, and the state of charge of the power battery during this discharge phase can be accurately estimated.
步骤102：当所述动力电池的荷电状态达到所述预设基准值时，控制所述动力电池放电至完全放电为止。Step 102: When the state of charge of the power battery reaches the preset reference value, the power battery is controlled to discharge until it is completely discharged.
其中，在动力电池从初始状态放电到荷电状态达到预设基准值的过程中，可能会出现动力电池的单体最低电压小于放电截止电压的情况。而本公开的实施例，在检测到此种情况发生时，通过降低当时的动力电池最大允许放电功率，来使得动力电池的单体最低电压回升，从而不再小于放电截止电压，进而消除动力电池过放的情况。然而，通过降低动力电池最大允许放电功率来提升单体最低电压，会导致动力电池放电到预设基准值时，动力电池的剩余电量与预设基准值存在一定偏差。因此，为了校准上述情况导致的偏差，在步骤102之前，还包括：Wherein, in the process that the power battery discharges from the initial state to the state of charge to reach the preset reference value, the lowest voltage of the power battery may be less than the discharge cutoff voltage. However, in the embodiment of the present disclosure, when detecting the occurrence of such a situation, by lowering the maximum allowable discharge power of the power battery at that time, the minimum voltage of the power battery is raised, thereby no longer being smaller than the discharge cutoff voltage, thereby eliminating the power battery. Overdraft situation. However, by lowering the maximum allowable discharge power of the power battery to increase the minimum voltage of the cell, the power battery may be discharged to a preset reference value, and the remaining battery power has a certain deviation from the preset reference value. Therefore, in order to calibrate the deviation caused by the above situation, before step 102, the method further includes:
在所述动力电池从所述初始状态放电到荷电状态达到所述预设基准值的过程中，若检测到所述动力电池的单体最低电压小于放电截止电压，则在所述动力电池的荷电状态达到所述预设基准值时，获取此刻的动力电池最大允许放电功率，并根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述动力电池的荷电状态的取值。And in the process of discharging the power battery from the initial state to the state of charge reaching the preset reference value, if it is detected that the lowest voltage of the cell of the power battery is less than the discharge cutoff voltage, then in the power battery When the state of charge reaches the preset reference value, the maximum allowable discharge power of the power battery at the moment is obtained, and according to the obtained maximum allowable discharge power of the power battery, and the value of the predetermined state of charge and the maximum allowable discharge of the power battery. The power correspondence table corrects the value of the state of charge of the power battery.
即本公开的实施例中，会预先确定动力电池的荷电状态取值与动力电池最大允许放电功率的对应关系表，从而在动力电池从初始状态放电到荷电状态达到预设基准值的过程中，出现动力电池的单体最低电压小于放电截止电压的情况时，可以依据该对应关系表对荷电状态进行校准。That is, in the embodiment of the present disclosure, a correspondence table between the value of the state of charge of the power battery and the maximum allowable discharge power of the power battery is determined in advance, so that the process of discharging the power battery from the initial state to the state of charge reaches a preset reference value. In the case where the lowest voltage of the power battery is lower than the discharge cutoff voltage, the state of charge can be calibrated according to the correspondence table.
其中，预先确定的荷电状态(State-Of-Charge，简称SOC)的取值与动力电池最大允许放电功率(State-Of-Power，简称SOP)的对应关系表可如表1所示。其中，SOP 0一般为整车行驶最小需求功率。 The correspondence between the value of the predetermined state of charge (State-Of-Charge, SOC for short) and the maximum allowable discharge power of the power battery (State-Of-Power, SOP for short) can be as shown in Table 1. Among them, SOP 0 is generally the minimum required power for the entire vehicle.
表1 SOC与SOP对应关系表Table 1 SOC and SOP correspondence table
SOC(％)SOC (%) Xn％Xn% Xn％-1Xn%-1 Xn％-2Xn%-2 Xn％-3Xn%-3 ……...... 0％0%
SOP(kw)SOP(kw) SOP n SOP n SOP n-1 SOP n-1 SOP n-2 SOP n-2 SOP n-3 SOP n-3 ……...... SOP 0 SOP 0
进一步地，上述根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述 动力电池的荷电状态的取值的步骤，包括：Further, the above is based on the obtained maximum allowable discharge power of the power battery, and the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, and correcting the value of the state of charge of the power battery. Steps, including:
从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值；Finding a value of a state of charge corresponding to the maximum allowable discharge power of the power battery from the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, and as the power battery Correction value of the state of charge;
控制所述动力电池从所述荷电状态为所述预设标准值开始继续放电，并按照所述第一预设周期，采用预设安时积分公式
Figure PCTCN2018097473-appb-000017
Figure PCTCN2018097473-appb-000018
估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述修正值为止，其中，SOC Y表示所述预设基准值，k为大于1的常量。 Controlling the power battery to continue discharging from the state of charge to the preset standard value, and adopting a preset ampere-hour integral formula according to the first preset period
Figure PCTCN2018097473-appb-000017
Figure PCTCN2018097473-appb-000018
The state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
即当在动力电池从初始状态放电到荷电状态达到预设基准值的过程中，出现动力电池的单体最低电压小于放电截止电压的情况时，可在动力电池放电到荷电状态达到预设基准值时，通过查表获得此时动力电池的荷电状态的理论值，然后控制动力电池继续放电，直到荷电状态达到理论值为止。That is, when the power battery is discharged from the initial state to the state where the state of charge reaches the preset reference value, when the minimum voltage of the power battery is lower than the discharge cutoff voltage, the power battery can be discharged to the state of charge to reach the preset state. At the reference value, the theoretical value of the state of charge of the power battery at this time is obtained by looking up the table, and then the power battery is controlled to continue to discharge until the state of charge reaches the theoretical value.
此外，进一步地，预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表包括不同温度范围下的荷电状态与动力电池最大允许放电功率的对应关系表；则上述从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值的步骤，包括：Further, the correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery; In the correspondence table between the determined value of the state of charge and the maximum allowable discharge power of the power battery, the value of the state of charge corresponding to the maximum allowable discharge power of the power battery is found, and is used as the charge of the power battery. The steps of correcting the status, including:
获取所述动力电池所处的环境温度，并在所述环境温度所处的温度范围对应的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值。Obtaining the ambient temperature at which the power battery is located, and searching and acquiring the power battery in a correspondence table between the value of the state of charge corresponding to the temperature range in which the ambient temperature is located and the maximum allowable discharge power of the power battery The value of the state of charge corresponding to the maximum allowable discharge power is used as a correction value of the state of charge of the power battery.
可选地，步骤102包括：Optionally, step 102 includes:
按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，并检测所述动力电池放出的电量是否达预设标准值的整数倍；Detecting whether the lowest voltage of the single cell of the power battery is less than the discharge cutoff voltage according to the second preset period, and detecting whether the power discharged by the power battery reaches an integral multiple of a preset standard value;
每当检测到所述动力电池的单体最低电压小于放电截止电压时，将所述动力电池放出的电量的累计值清零，并将所述动力电池的荷电状态的取值减小第一预设量，获得所述动力电池的荷电状态的目标值，并从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与所述目标值对应的动力电池最大允许放电功率，并将此刻动力电池最大允许放电功率调节到与所述目标值对应的动力电池最大允许放电功率；Whenever the minimum voltage of the cell of the power battery is detected to be less than the discharge cutoff voltage, the accumulated value of the amount of power discharged by the power battery is cleared, and the value of the state of charge of the power battery is decreased by first. a predetermined amount, obtaining a target value of a state of charge of the power battery, and searching for a power corresponding to the target value from a correspondence table between a predetermined value of the state of charge and a maximum allowable discharge power of the power battery The maximum allowable discharge power of the battery, and adjust the maximum allowable discharge power of the power battery at this moment to the maximum allowable discharge power of the power battery corresponding to the target value;
每当所述动力电池放出的电量达到所述预设标准值的整数倍时，将所述 动力电池的荷电状态的取值减小第二预设量，直到所述动力电池的荷电状态的取值达到零为止。Whenever the amount of power discharged by the power battery reaches an integral multiple of the preset standard value, the value of the state of charge of the power battery is decreased by a second predetermined amount until the state of charge of the power battery The value reaches zero.
即在动力电池从预设基准值开始，继续放电到完全放电为止的过程中，会周期性检测动力电池的单体最低电压是否小于放电截止电压，同时判断动力电池放出的电量是否达到预设标准值的整数倍。其中，只要检测到动力电池的单体最低电压小于放电截止电压，则将动力电池的荷电状态减小第一预设量，同时将动力电池放出的电量的累计值清零(即重新开始计算放电量)，并且在动力电池放出的电量的累计值未清零之前，只要放出的电量达到预设标准值，则将动力电池的荷电状态减小第二预设量。其中，对于第一预设量和第二预设量可根据实际情况进行标定。That is, in the process that the power battery starts from the preset reference value and continues to discharge until it is completely discharged, it is periodically detected whether the minimum voltage of the power battery is lower than the discharge cutoff voltage, and whether the power discharged from the power battery reaches the preset standard. An integer multiple of the value. Wherein, as long as the minimum voltage of the cell of the power battery is detected to be less than the discharge cutoff voltage, the state of charge of the power battery is reduced by a first predetermined amount, and the accumulated value of the amount of power discharged by the power battery is cleared (ie, the calculation is restarted) The amount of discharge), and before the accumulated value of the amount of power discharged from the power battery is not cleared, the state of charge of the power battery is decreased by the second predetermined amount as long as the discharged amount reaches the preset standard value. The first preset amount and the second preset amount may be calibrated according to actual conditions.
具体地，举例来说，设预设标准值为Δx，则动力电池从预设基准值开始放电时，若动力电池放出的电量还未达到Δx，就检测到动力电池的单体最低电压小于放电截止电压，则将动力电池的荷电状态减小1％，并重新开始计算电池的放电量。此后的放电过程中，若一直未检测到动力电池的单体最低电压小于放电截止电压，则只要检测到重新计算的动力电池的放电量达到Δx、2Δx、3Δx……就分别依次将动力电池的荷电状态减小1％。Specifically, for example, if the preset standard value is Δx, when the power battery starts to discharge from the preset reference value, if the power discharged by the power battery has not reached Δx, it is detected that the lowest voltage of the power battery is less than the discharge. The cutoff voltage reduces the state of charge of the power battery by 1% and restarts the calculation of the battery discharge. In the subsequent discharge process, if it is not detected that the minimum voltage of the cell of the power battery is less than the discharge cutoff voltage, the power battery is sequentially turned on as long as it is detected that the recalculated power battery discharge amount reaches Δx, 2Δx, 3Δx, ... The state of charge is reduced by 1%.
此外，在动力电池从预设基准值开始，继续放电到完全放电为止的过程中，每当出现动力电池的单体最低电压是否小于放电截止电压时，还需要对当时的动力电池最大允许放电功率进行校准，即根据当时动力电池的荷电状态的取值与预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，进行校准。In addition, in the process of the power battery starting from the preset reference value and continuing to discharge until the complete discharge, the maximum allowable discharge power of the current power battery is required whenever the minimum voltage of the power battery is lower than the discharge cutoff voltage. The calibration is performed, that is, according to the correspondence between the value of the state of charge of the power battery at that time and the value of the predetermined state of charge and the maximum allowable discharge power of the power battery.
进一步地，预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表包括不同温度范围下的荷电状态与动力电池最大允许放电功率的对应关系表；则上述从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与所述目标值对应的动力电池最大允许放电功率的步骤，包括：Further, the correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery; In the table of the correspondence between the value of the state of charge and the maximum allowable discharge power of the power battery, the steps of finding the maximum allowable discharge power of the power battery corresponding to the target value include:
获取所述动力电池所处的环境温度，并在所述环境温度所处的温度范围对应的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与所述目标值对应的动力电池最大允许放电功率。Obtaining an ambient temperature at which the power battery is located, and in a correspondence table between a value of a state of charge corresponding to a temperature range in which the ambient temperature is located and a maximum allowable discharge power of the power battery, searching for a corresponding value of the target value The maximum allowable discharge power of the power battery.
由上述可知，本公开的实施例中，动力电池的放电过程主要分为两个阶段：从初始状态放电到荷电状态达到预设基准值的过程为第一阶段，从荷电状态为预设基准值开始放电到荷电状态为零的过程为第二阶段。而无论哪一个阶段，本公开的实施例，都会持续估算动力电池的荷电状态，从而为评估电动汽车的剩余续航能力提供数据支持，进而保证汽车的正常行驶。It can be seen from the above that in the embodiment of the present disclosure, the discharge process of the power battery is mainly divided into two stages: the process from the initial state discharge to the state of charge reaching the preset reference value is the first stage, and the state of charge is preset. The process in which the reference value begins to discharge until the state of charge is zero is the second stage. At any stage, the embodiment of the present disclosure continuously estimates the state of charge of the power battery, thereby providing data support for evaluating the remaining battery life of the electric vehicle, thereby ensuring normal driving of the vehicle.
此外，动力电池的单体最低电压小于放电截止电压时，会导致动力电池过放。而本公开的实施例，在动力电池的整个放电过程中，通过周期性检测动力电池的单体最低电压是否小于放电截止电压，可以防止动力电池过放，从而延长使用寿命。In addition, when the minimum voltage of the power battery is lower than the discharge cut-off voltage, the power battery is over-discharged. However, in the embodiment of the present disclosure, during the entire discharge process of the power battery, by periodically detecting whether the minimum voltage of the single cell of the power battery is less than the discharge cutoff voltage, the power battery can be prevented from being over-discharged, thereby prolonging the service life.
由上述可知，本公开的实施例，在具体实施时，可按照图2所示的流程图进行。It can be seen from the above that the embodiment of the present disclosure can be carried out according to the flowchart shown in FIG. 2 in the specific implementation.
综上所述，本公开的实施例，在各温度范围下根据动力电池的容量性能及功率性能分别选取SOC的预设基准值Xn％，即，SOC-100％放电至SOC-Xn％，能够满足整车需求；SOC-Xn％放电至SOC-0％，能够将电池包剩余的电量全部放出，充分的发挥动力电池的能力的同时，还能够通过安时积分法准确的估算SOC，并且本公开实施例的动力电池的放电控制方法，对电池的一致性有较强的适应能力。In summary, in the embodiment of the present disclosure, the preset reference value Xn% of the SOC is selected according to the capacity performance and the power performance of the power battery in each temperature range, that is, the SOC-100% discharge to the SOC-Xn%, Meet the demand of the whole vehicle; SOC-Xn% discharge to SOC-0%, can release the remaining power of the battery pack, fully utilize the power battery capacity, and also accurately estimate the SOC through the hourly integration method, and this The discharge control method of the power battery of the disclosed embodiment has a strong adaptability to the consistency of the battery.
本公开的实施例还提供了一种动力电池的放电控制装置，如图3所示，该动力电池的放电控制装置300包括：An embodiment of the present disclosure further provides a discharge control device for a power battery. As shown in FIG. 3, the discharge control device 300 of the power battery includes:
第一放电控制模块301，用于当动力电池从初始状态进入放电状态时，控制所述动力电池放电到荷电状态达到预设基准值，所述预设基准值表示所述动力电池从荷电状态为100％开始放出满足整车所需的电量之后的荷电状态的取值；The first discharge control module 301 is configured to control the power battery to discharge to a preset state when the power battery enters a discharge state from an initial state, where the preset reference value indicates that the power battery is charged The value of the state of charge after the state is 100% to start discharging the power required by the vehicle;
第二放电控制模块303，用于当所述动力电池的荷电状态达到所述预设基准值时，控制所述动力电池放电至完全放电为止。The second discharge control module 303 is configured to control the power battery to discharge until it is completely discharged when the state of charge of the power battery reaches the preset reference value.
可选地，如图4所示，所述第一放电控制模块301包括：Optionally, as shown in FIG. 4, the first discharge control module 301 includes:
第一检测单元3011，用于按照第一预设周期，采用原始安时积分公式
Figure PCTCN2018097473-appb-000019
估算所述动力电池的荷电状态，并按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，其中，SOC 0表示所述动力电池处于所述初始状态时的荷电状态的取值，η表示所述动力电池的充放电效率，C表示所述动力电池的额定容量，I表示所述动力电池的电流； The first detecting unit 3011 is configured to adopt an original ampere-hour integral formula according to the first preset period.
Figure PCTCN2018097473-appb-000019
Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state The value of the electrical state, η represents the charging and discharging efficiency of the power battery, C represents the rated capacity of the power battery, and I represents the current of the power battery;
第一处理单元3012，用于当第N次检测到所述动力电池的单体最低电压小于放电截止电压时，将此刻的动力电池最大允许放电功率降低第N预设值，并按照所述第一预设周期采用第N安时积分公式
Figure PCTCN2018097473-appb-000020
Figure PCTCN2018097473-appb-000021
dt估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述预设基准值为止，其中，SOC N表示第N次检测到所述动力电池的单体最低电压小于放电截止电压时，所述动力电池的荷电状态的取值，N为大于0的整数，k N为大于1的常量。 The first processing unit 3012 is configured to: when the Nth lowest voltage of the power battery is detected to be lower than the discharge cutoff voltage, reduce the maximum allowable discharge power of the power battery to the Nth preset value, and according to the The Nth hour integral formula is used for a preset period
Figure PCTCN2018097473-appb-000020
Figure PCTCN2018097473-appb-000021
Dt estimating the state of charge of the power battery until the state of charge of the power battery reaches the preset reference value, wherein SOC N indicates that the lowest voltage of the cell of the power battery detected by the Nth time is less than discharge At the time of the cutoff voltage, the value of the state of charge of the power battery, N is an integer greater than 0, and k N is a constant greater than one.
可选地，如图4所示，所述装置还包括：Optionally, as shown in FIG. 4, the apparatus further includes:
修正模块302，用于在所述动力电池从所述初始状态放电到荷电状态达到所述预设基准值的过程中，若检测到所述动力电池的单体最低电压小于放电截止电压，则在所述动力电池的荷电状态达到所述预设基准值时，获取此刻的动力电池最大允许放电功率，并根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述动力电池的荷电状态的取值。a correction module 302, configured to: when the power battery is discharged from the initial state to a state in which the state of charge reaches the preset reference value, if it is detected that a minimum voltage of the power battery is less than a discharge cutoff voltage, When the state of charge of the power battery reaches the preset reference value, the maximum allowable discharge power of the power battery at the moment is obtained, and according to the obtained maximum allowable discharge power of the power battery, and the value of the predetermined state of charge The value of the state of charge of the power battery is corrected by a correspondence table with the maximum allowable discharge power of the power battery.
可选地，如图4所示，所述修正模块302包括：Optionally, as shown in FIG. 4, the modification module 302 includes:
查表单元3021，用于从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值；The look-up table unit 3021 is configured to search for a value of a state of charge corresponding to the obtained maximum allowable discharge power of the power battery from a correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery. And as a correction value of the state of charge of the power battery;
第二处理单元3022，用于控制所述动力电池从所述荷电状态为所述预设标准值开始继续放电，并按照所述第一预设周期，采用预设安时积分公式
Figure PCTCN2018097473-appb-000022
估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述修正值为止，其中，SOC Y表示所述预设基准值，k为大于1的常量。 a second processing unit 3022, configured to control the power battery to continue discharging from the state of charge to the preset standard value, and adopt a preset ampere-hour integral formula according to the first preset period
Figure PCTCN2018097473-appb-000022
The state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
可选地，如图4所示，所述第二放电控制模块303包括：Optionally, as shown in FIG. 4, the second discharge control module 303 includes:
第二检测单元3031，用于按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，并检测所述动力电池放出的电量是否达预设标准值的整数倍；The second detecting unit 3031 is configured to detect, according to the second preset period, whether the lowest voltage of the power battery is less than a discharge cutoff voltage, and detect whether the power discharged by the power battery reaches an integral multiple of a preset standard value;
第三处理单元3032，用于在每当检测到所述动力电池的单体最低电压小于放电截止电压时，将所述动力电池放出的电量的累计值清零，并将所述动力电池的荷电状态的取值减小第一预设量，获得所述动力电池的荷电状态的目标值，并从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与所述目标值对应的动力电池最大允许放电功率，并将此刻动力电池最大允许放电功率调节到与所述目标值对应的动力电池最大允许放电功率；The third processing unit 3032 is configured to clear the accumulated value of the amount of power discharged by the power battery every time the minimum voltage of the power battery is detected to be less than the discharge cutoff voltage, and the charge of the power battery The value of the electrical state is decreased by a first predetermined amount, the target value of the state of charge of the power battery is obtained, and from the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, Finding a maximum allowable discharge power of the power battery corresponding to the target value, and adjusting a maximum allowable discharge power of the power battery at the moment to a maximum allowable discharge power of the power battery corresponding to the target value;
第四处理单元3033，用于在每当所述动力电池放出的电量达到所述预设标准值的整数倍时，将所述动力电池的荷电状态的取值减小第二预设量，直到所述动力电池的荷电状态的取值达到零为止。The fourth processing unit 3033 is configured to reduce the value of the state of charge of the power battery by a second predetermined amount each time the amount of power discharged by the power battery reaches an integral multiple of the preset standard value. Until the value of the state of charge of the power battery reaches zero.
可选地，所述预设基准值是根据所述动力电池的功率特性和容量特性确定的。Optionally, the preset reference value is determined according to power characteristics and capacity characteristics of the power battery.
可选地，预先确定的荷电状态的取值与动力电池最大允许放电功率的对 应关系表包括不同温度范围下的荷电状态与动力电池最大允许放电功率的对应关系表；Optionally, the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence table between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery;
所述查表单元3021具体用于：The look-up table unit 3021 is specifically configured to:
获取所述动力电池所处的环境温度，并在所述环境温度所处的温度范围对应的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值。Obtaining the ambient temperature at which the power battery is located, and searching and acquiring the power battery in a correspondence table between the value of the state of charge corresponding to the temperature range in which the ambient temperature is located and the maximum allowable discharge power of the power battery The value of the state of charge corresponding to the maximum allowable discharge power is used as a correction value of the state of charge of the power battery.
由上述可知，本公开的实施例，能够控制动力电池从初始状态放电到荷电状态达到预设基准值，从而满足整车的电量需求，并且当动力电池的荷电状态达到预设基准值时，还能够进一步控制动力电池继续放电，直到将剩余的电量全部放出为止，以便于供汽车使用。因此，本公开的实施例，能够充分发挥动力电池的供电能力，从而解决相关技术中动力电池中会遗留部分电量而无法使用，从而造成电量浪费的问题。It can be seen from the above that the embodiment of the present disclosure can control the power battery to discharge from the initial state to the state of charge to reach a preset reference value, thereby satisfying the power demand of the entire vehicle, and when the state of charge of the power battery reaches a preset reference value. It is also possible to further control the power battery to continue to discharge until all the remaining power is discharged, so as to be used by the automobile. Therefore, in the embodiments of the present disclosure, the power supply capability of the power battery can be fully utilized, thereby solving the problem that the power battery in the related art may be partially uncharged and cannot be used, thereby causing waste of power.
本公开的实施例还提供了一种控制器，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器读取所述存储器中的程序，执行如上述所述的动力电池的放电控制方法中的步骤。Embodiments of the present disclosure also provide a controller including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor reading a program in the memory The steps in the discharge control method of the power battery as described above are performed.
本公开的实施例还提供了一种汽车，包括上述所述的控制器。Embodiments of the present disclosure also provide an automobile including the controller described above.
以上所述的是本公开的可选实施方式，应当指出对于本技术领域的普通人员来说，在不脱离本公开所述的原理前提下还可以作出若干改进和润饰，这些改进和润饰也在本公开的保护范围内。The above is an alternative embodiment of the present disclosure, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present disclosure. Within the scope of protection of the present disclosure.

Claims (16)

  1. 一种动力电池的放电控制方法，包括：A discharge control method for a power battery, comprising:
    当动力电池从初始状态进入放电状态时，控制所述动力电池放电到荷电状态达到预设基准值，所述预设基准值表示所述动力电池从荷电状态为100％开始放出满足整车所需的电量之后的荷电状态的取值；When the power battery enters the discharge state from the initial state, the power battery is discharged to a state of charge to a preset reference value, and the preset reference value indicates that the power battery starts to discharge from the state of charge to 100%. The value of the state of charge after the required amount of power;
    当所述动力电池的荷电状态达到所述预设基准值时，控制所述动力电池放电至完全放电为止。When the state of charge of the power battery reaches the preset reference value, the power battery is controlled to discharge until it is completely discharged.
  2. 根据权利要求1所述的方法，其中，所述控制所述动力电池放电到荷电状态达到预设基准值的步骤，包括：The method of claim 1 wherein said step of controlling said power battery to discharge to a state of charge to a predetermined reference value comprises:
    按照第一预设周期，采用原始安时积分公式
    Figure PCTCN2018097473-appb-100001
    估算所述动力电池的荷电状态，并按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，其中，SOC 0表示所述动力电池处于所述初始状态时的荷电状态的取值，η表示所述动力电池的充放电效率，C表示所述动力电池的额定容量，I表示所述动力电池的电流；     According to the first preset period, the original ampere-hour integral formula is adopted.
    Figure PCTCN2018097473-appb-100001
    Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state The value of the electrical state, η represents the charging and discharging efficiency of the power battery, C represents the rated capacity of the power battery, and I represents the current of the power battery;
    当第N次检测到所述动力电池的单体最低电压小于放电截止电压时，将此刻的动力电池最大允许放电功率降低第N预设值，并按照所述第一预设周期采用第N安时积分公式
    Figure PCTCN2018097473-appb-100002
    估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述预设基准值为止，其中，SOC N表示第N次检测到所述动力电池的单体最低电压小于放电截止电压时，所述动力电池的荷电状态的取值，N为大于0的整数，k N为大于1的常量。     When the Nth lowest voltage of the power battery is detected to be less than the discharge cutoff voltage, the maximum allowable discharge power of the power battery is lowered to the Nth preset value, and the Nth safety is adopted according to the first preset period. Time integral formula
    Figure PCTCN2018097473-appb-100002
    Estimating the state of charge of the power battery until the state of charge of the power battery reaches the preset reference value, wherein SOC N indicates that the lowest voltage of the cell of the power battery is detected to be less than the discharge cutoff at the Nth time At the time of voltage, the value of the state of charge of the power battery, N is an integer greater than 0, and k N is a constant greater than one.
  3. 根据权利要求2所述的方法，其中，所述控制所述动力电池放电至完全放电为止的步骤之前，所述方法还包括：The method of claim 2, wherein the method further comprises: before the step of controlling the power battery to discharge until fully discharged, the method further comprising:
    在所述动力电池从所述初始状态放电到荷电状态达到所述预设基准值的过程中，若检测到所述动力电池的单体最低电压小于放电截止电压，则在所述动力电池的荷电状态达到所述预设基准值时，获取此刻的动力电池最大允许放电功率，并根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述动力电池的荷电状态的取值。And in the process of discharging the power battery from the initial state to the state of charge reaching the preset reference value, if it is detected that the lowest voltage of the cell of the power battery is less than the discharge cutoff voltage, then in the power battery When the state of charge reaches the preset reference value, the maximum allowable discharge power of the power battery at the moment is obtained, and according to the obtained maximum allowable discharge power of the power battery, and the value of the predetermined state of charge and the maximum allowable discharge of the power battery. The power correspondence table corrects the value of the state of charge of the power battery.
  4. 根据权利要求3所述的方法，其中，所述根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述动力电池的荷电状态的取值的步骤，包括：The method according to claim 3, wherein said correcting said power according to the obtained maximum allowable discharge power of the power battery, and a correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery The steps of the value of the state of charge of the battery include:
    从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值；Finding a value of a state of charge corresponding to the maximum allowable discharge power of the power battery from the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, and as the power battery Correction value of the state of charge;
    控制所述动力电池从所述荷电状态为所述预设标准值开始继续放电，并按照所述第一预设周期，采用预设安时积分公式
    Figure PCTCN2018097473-appb-100003
    Figure PCTCN2018097473-appb-100004
    估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述修正值为止，其中，SOC Y表示所述预设基准值，k为大于1的常量。     Controlling the power battery to continue discharging from the state of charge to the preset standard value, and adopting a preset ampere-hour integral formula according to the first preset period
    Figure PCTCN2018097473-appb-100003
    Figure PCTCN2018097473-appb-100004
    The state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
  5. 根据权利要求1所述的方法，其中，所述控制所述动力电池放电至完全放电为止的步骤，包括：The method of claim 1 wherein said step of controlling said power battery to discharge until fully discharged comprises:
    按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，并检测所述动力电池放出的电量是否达预设标准值的整数倍；Detecting whether the lowest voltage of the single cell of the power battery is less than the discharge cutoff voltage according to the second preset period, and detecting whether the power discharged by the power battery reaches an integral multiple of a preset standard value;
    每当检测到所述动力电池的单体最低电压小于放电截止电压时，将所述动力电池放出的电量的累计值清零，并将所述动力电池的荷电状态的取值减小第一预设量，获得所述动力电池的荷电状态的目标值，并从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与所述目标值对应的动力电池最大允许放电功率，并将此刻动力电池最大允许放电功率调节到与所述目标值对应的动力电池最大允许放电功率；Whenever the minimum voltage of the cell of the power battery is detected to be less than the discharge cutoff voltage, the accumulated value of the amount of power discharged by the power battery is cleared, and the value of the state of charge of the power battery is decreased by first. a predetermined amount, obtaining a target value of a state of charge of the power battery, and searching for a power corresponding to the target value from a correspondence table between a predetermined value of the state of charge and a maximum allowable discharge power of the power battery The maximum allowable discharge power of the battery, and adjust the maximum allowable discharge power of the power battery at this moment to the maximum allowable discharge power of the power battery corresponding to the target value;
    每当所述动力电池放出的电量达到所述预设标准值的整数倍时，将所述动力电池的荷电状态的取值减小第二预设量，直到所述动力电池的荷电状态的取值达到零为止。Whenever the amount of power discharged by the power battery reaches an integral multiple of the preset standard value, the value of the state of charge of the power battery is decreased by a second predetermined amount until the state of charge of the power battery The value reaches zero.
  6. 根据权利要求1所述的方法，其中，所述预设基准值是根据所述动力电池的功率特性和容量特性确定的。The method of claim 1, wherein the predetermined reference value is determined according to a power characteristic and a capacity characteristic of the power battery.
  7. 根据权利要求4所述的方法，其中，预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表包括不同温度范围下的荷电状态与动力电池最大允许放电功率的对应关系表；The method according to claim 4, wherein the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery. table;
    所述从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值的步骤，包括：In the correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, searching for the value of the state of charge corresponding to the maximum allowable discharge power of the obtained power battery, and using the power as the power The steps of correcting the state of charge of the battery include:
    获取所述动力电池所处的环境温度，并在所述环境温度所处的温度范围对应的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值。Obtaining the ambient temperature at which the power battery is located, and searching and acquiring the power battery in a correspondence table between the value of the state of charge corresponding to the temperature range in which the ambient temperature is located and the maximum allowable discharge power of the power battery The value of the state of charge corresponding to the maximum allowable discharge power is used as a correction value of the state of charge of the power battery.
  8. 一种动力电池的放电控制装置，包括：A discharge control device for a power battery, comprising:
    第一放电控制模块，用于当动力电池从初始状态进入放电状态时，控制所述动力电池放电到荷电状态达到预设基准值，所述预设基准值表示所述动力电池从荷电状态为100％开始放出满足整车所需的电量之后的荷电状态的取值；a first discharge control module, configured to control the power battery to discharge to a preset state when the power battery enters a discharge state from an initial state, wherein the preset reference value indicates that the power battery is from a state of charge The value of the state of charge after 100% of the power consumption required to satisfy the vehicle is started to be released;
    第二放电控制模块，用于当所述动力电池的荷电状态达到所述预设基准值时，控制所述动力电池放电至完全放电为止。The second discharge control module is configured to control the power battery to discharge until it is completely discharged when the state of charge of the power battery reaches the preset reference value.
  9. 根据权利要求8所述的装置，其中，所述第一放电控制模块包括：The apparatus of claim 8 wherein said first discharge control module comprises:
    第一检测单元，用于按照第一预设周期，采用原始安时积分公式
    Figure PCTCN2018097473-appb-100005
    估算所述动力电池的荷电状态，并按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，其中，SOC 0表示所述动力电池处于所述初始状态时的荷电状态的取值，η表示所述动力电池的充放电效率，C表示所述动力电池的额定容量，I表示所述动力电池的电流；     a first detecting unit, configured to adopt an original ampere-hour integral formula according to the first preset period
    Figure PCTCN2018097473-appb-100005
    Estimating a state of charge of the power battery, and detecting whether a minimum voltage of the cell of the power battery is less than a discharge cutoff voltage according to a second preset period, wherein SOC 0 represents a charge of the power battery when in the initial state The value of the electrical state, η represents the charging and discharging efficiency of the power battery, C represents the rated capacity of the power battery, and I represents the current of the power battery;
    第一处理单元，用于当第N次检测到所述动力电池的单体最低电压小于放电截止电压时，将此刻的动力电池最大允许放电功率降低第N预设值，并按照所述第一预设周期采用第N安时积分公式
    Figure PCTCN2018097473-appb-100006
    Figure PCTCN2018097473-appb-100007
    估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述预设基准值为止，其中，SOC N表示第N次检测到所述动力电池的单体最低电压小于放电截止电压时，所述动力电池的荷电状态的取值，N为大于0的整数，k N为大于1的常量。     a first processing unit, configured to reduce the maximum allowable discharge power of the power battery to the Nth preset value when the Nth lowest voltage of the power battery is detected to be lower than the discharge cutoff voltage, and according to the first The Nth hour integral formula is used for the preset period
    Figure PCTCN2018097473-appb-100006
    Figure PCTCN2018097473-appb-100007
    Estimating the state of charge of the power battery until the state of charge of the power battery reaches the preset reference value, wherein SOC N indicates that the lowest voltage of the cell of the power battery is detected to be less than the discharge cutoff at the Nth time At the time of voltage, the value of the state of charge of the power battery, N is an integer greater than 0, and k N is a constant greater than one.
  10. 根据权利要求9所述的装置，其中，所述装置还包括：The apparatus of claim 9 wherein said apparatus further comprises:
    修正模块，用于在所述动力电池从所述初始状态放电到荷电状态达到所述预设基准值的过程中，若检测到所述动力电池的单体最低电压小于放电截止电压，则在所述动力电池的荷电状态达到所述预设基准值时，获取此刻的动力电池最大允许放电功率，并根据获取到的动力电池最大允许放电功率，以及预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表，修正所述动力电池的荷电状态的取值。a correction module, configured to: when the power battery is discharged from the initial state to a state in which the state of charge reaches the preset reference value, if it is detected that a minimum voltage of the power battery is less than a discharge cutoff voltage, When the state of charge of the power battery reaches the preset reference value, the maximum allowable discharge power of the power battery at the moment is obtained, and according to the obtained maximum allowable discharge power of the power battery, and the value of the predetermined state of charge and The correspondence table of the maximum allowable discharge power of the power battery is used to correct the value of the state of charge of the power battery.
  11. 根据权利要求10所述的装置，其中，所述修正模块包括：The apparatus of claim 10 wherein said correction module comprises:
    查表单元，用于从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值；a look-up unit for finding a value of a state of charge corresponding to the maximum allowable discharge power of the obtained power battery from a correspondence table between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery, and a correction value as a state of charge of the power battery;
    第二处理单元，用于控制所述动力电池从所述荷电状态为所述预设标准值开始继续放电，并按照所述第一预设周期，采用预设安时积分公式
    Figure PCTCN2018097473-appb-100008
    估算所述动力电池的荷电状态，直到所述动力电池的荷电状态达到所述修正值为止，其中，SOC Y表示所述预设基准值，k为大于1的常量。     a second processing unit, configured to control the power battery to continue discharging from the state of charge to the preset standard value, and adopt a preset ampere-hour integral formula according to the first preset period
    Figure PCTCN2018097473-appb-100008
    The state of charge of the power battery is estimated until the state of charge of the power battery reaches the correction value, wherein SOC Y represents the preset reference value, and k is a constant greater than one.
  12. 根据权利要求8所述的装置，其中，所述第二放电控制模块包括：The apparatus of claim 8 wherein said second discharge control module comprises:
    第二检测单元，用于按照第二预设周期检测所述动力电池的单体最低电压是否小于放电截止电压，并检测所述动力电池放出的电量是否达预设标准值的整数倍；a second detecting unit, configured to detect, according to a second preset period, whether a minimum voltage of the power battery is less than a discharge cutoff voltage, and detecting whether the power discharged by the power battery reaches an integral multiple of a preset standard value;
    第三处理单元，用于在每当检测到所述动力电池的单体最低电压小于放电截止电压时，将所述动力电池放出的电量的累计值清零，并将所述动力电池的荷电状态的取值减小第一预设量，获得所述动力电池的荷电状态的目标值，并从预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与所述目标值对应的动力电池最大允许放电功率，并将此刻动力电池最大允许放电功率调节到与所述目标值对应的动力电池最大允许放电功率；a third processing unit, configured to clear the accumulated value of the amount of power discharged by the power battery every time the minimum voltage of the power battery is detected to be less than the discharge cutoff voltage, and charge the power battery The value of the state is decreased by the first preset amount, the target value of the state of charge of the power battery is obtained, and the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery is searched. a maximum allowable discharge power of the power battery corresponding to the target value, and adjusting a maximum allowable discharge power of the power battery at the moment to a maximum allowable discharge power of the power battery corresponding to the target value;
    第四处理单元，用于在每当所述动力电池放出的电量达到所述预设标准值的整数倍时，将所述动力电池的荷电状态的取值减小第二预设量，直到所述动力电池的荷电状态的取值达到零为止。a fourth processing unit, configured to reduce a value of a state of charge of the power battery by a second predetermined amount each time the amount of power discharged by the power battery reaches an integral multiple of the preset standard value; The value of the state of charge of the power battery reaches zero.
  13. 根据权利要求8所述的装置，其中，所述预设基准值是根据所述动力电池的功率特性和容量特性确定的。The apparatus according to claim 8, wherein said preset reference value is determined based on a power characteristic and a capacity characteristic of said power battery.
  14. 根据权利要求11所述的装置，其中，预先确定的荷电状态的取值与动力电池最大允许放电功率的对应关系表包括不同温度范围下的荷电状态与动力电池最大允许放电功率的对应关系表；The apparatus according to claim 11, wherein the correspondence between the value of the predetermined state of charge and the maximum allowable discharge power of the power battery includes a correspondence between the state of charge at different temperature ranges and the maximum allowable discharge power of the power battery. table;
    所述查表单元具体用于：The lookup unit is specifically configured to:
    获取所述动力电池所处的环境温度，并在所述环境温度所处的温度范围对应的荷电状态的取值与动力电池最大允许放电功率的对应关系表中，查找与获取到的动力电池最大允许放电功率对应的荷电状态的取值，并作为所述动力电池的荷电状态的修正值。Obtaining the ambient temperature at which the power battery is located, and searching and acquiring the power battery in a correspondence table between the value of the state of charge corresponding to the temperature range in which the ambient temperature is located and the maximum allowable discharge power of the power battery The value of the state of charge corresponding to the maximum allowable discharge power is used as a correction value of the state of charge of the power battery.
  15. 一种控制器，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，其中，所述处理器读取所述存储器中的程序，执行如权利要求1至7中任一项所述的动力电池的放电控制方法中的步骤。A controller comprising a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein the processor reads a program in the memory, as in claim 1 The step in the discharge control method of the power battery according to any one of the seventh aspects.
  16. 一种汽车，包括：如权利要求15所述的控制器。A vehicle comprising: the controller of claim 15.
PCT/CN2018/097473 2017-07-31 2018-07-27 Discharge control method and device for power battery, controller, and automobile WO2019024787A1 (en)

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