WO2022257556A1 - 确定电池包荷电状态的装置和方法 - Google Patents
确定电池包荷电状态的装置和方法 Download PDFInfo
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- WO2022257556A1 WO2022257556A1 PCT/CN2022/083408 CN2022083408W WO2022257556A1 WO 2022257556 A1 WO2022257556 A1 WO 2022257556A1 CN 2022083408 W CN2022083408 W CN 2022083408W WO 2022257556 A1 WO2022257556 A1 WO 2022257556A1
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- Prior art keywords
- voltage
- battery pack
- charge
- state
- aging rate
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000032683 aging Effects 0.000 claims abstract description 113
- 230000005611 electricity Effects 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims description 27
- CNQCVBJFEGMYDW-UHFFFAOYSA-N lawrencium atom Chemical compound [Lr] CNQCVBJFEGMYDW-UHFFFAOYSA-N 0.000 description 81
- 238000007599 discharging Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Definitions
- the present disclosure relates to the technical field of batteries, in particular to a device and method for determining the state of charge of a battery pack.
- Lithium iron phosphate (English: Lithium Iron Phosphate, abbreviation: LFP) battery has the advantages of long cycle life, low cost, wide abundance of raw materials, safe system and not easy to fire, etc. It is one of the important choices for power batteries.
- SOC (English: State of Charge, Chinese: State of Charge) is an important parameter to evaluate the state of the battery, which is of great significance to the safe and efficient use of the battery.
- the SOC of the LFP battery pack is mainly calculated by the ampere-hour integration method combined with OCV (English: Open Circuit Voltage, Chinese: Open Circuit Voltage).
- OCV Open Circuit Voltage
- the OCV-SOC curve of LFP battery pack is relatively flat, which will affect the accuracy of calculating SOC.
- the present disclosure aims to solve one of the technical problems in the related art at least to a certain extent.
- an object of the present disclosure is to propose a device for determining the state of charge of a battery pack.
- a device for determining the state of charge of a battery pack includes a controller, a battery pack and active components, the controller is connected to the battery pack, The battery pack and the active components form a battery pack circuit, and the cells in the battery pack are connected in series with the active components;
- the controller is configured to acquire the first element voltage of the active element and the first total voltage of the battery pack circuit at the first energization moment, and obtain the second element voltage of the active element at the second energization moment and the second total voltage of the battery pack circuit and the amount of electricity passing through the battery pack circuit from the first power-on moment to the second power-on moment;
- the controller is further configured to determine the first aging of the battery pack according to the first element voltage, the second element voltage, the first total voltage, the second total voltage and the electric quantity rate and a second aging rate of said active element;
- the controller is further configured to acquire the current third element voltage of the active element, and determine the current battery pack voltage according to the third element voltage, the first aging rate and the second aging rate. target state of charge.
- controller is used for:
- the first aging rate and the second aging rate are determined according to the first state of charge change, the second state of charge change and the electric quantity.
- controller is used for:
- the first formula includes:
- f LFP is the first aging rate
- Q LFP is the first initial capacity of the battery pack
- ⁇ Q is the electric quantity
- ⁇ x is the change amount of the first state of charge
- the second formula includes:
- f RE is the second aging rate
- Q RE is the second initial capacity of the active element
- ⁇ y is the second state of charge variation.
- controller is used for:
- the element charge state of the active element is determined by using a preset correspondence relationship, the preset correspondence relationship is the element voltage of the active element and the charge of the active element Correspondence between electrical states;
- the third formula includes:
- x is the target state of charge
- x0 is the first initial state of charge of the battery pack
- y is the state of charge of the component
- y0 is the second initial state of charge of the active component
- Q LFP is the first initial capacity of the battery pack
- Q RE is the second initial capacity of the active components
- f LFP is the first aging rate
- f RE is the second aging rate.
- the device further includes a first voltage sampler and a second voltage sampler, the first voltage sampler is used to collect the element voltage of the active element, and the second voltage sampler is used to collect the The total voltage of the battery pack circuit;
- the active element is arranged outside the battery pack; or, the active element is arranged inside the battery pack.
- Another object of the present disclosure is to provide a method for determining the state of charge of a battery pack.
- a method for determining the state of charge of a battery pack which is applied to a device for determining the state of charge of a battery pack, the device includes a battery pack and active components, and the battery pack is connected to the active element.
- the source element constitutes a battery pack circuit, and the cells in the battery pack are connected in series with the active element, and the method includes:
- the first component voltage, the second component voltage, the first total voltage, the second total voltage and the electric quantity determine a first aging rate of the battery pack and a first aging rate of the active component second aging rate
- the first total voltage, the second total voltage, the first element voltage, the second element voltage and the electric quantity, the first aging rate and The second aging rate of the active element comprises:
- the first aging rate and the second aging rate are determined according to the first state of charge change, the second state of charge change and the electric quantity.
- the determining the first aging rate and the second aging rate according to the first state of charge change, the second state of charge change and the electric quantity includes:
- the first formula includes:
- f LFP is the first aging rate
- Q LFP is the first initial capacity of the battery pack
- ⁇ Q is the electric quantity
- ⁇ x is the change amount of the first state of charge
- the second formula includes:
- f RE is the second aging rate
- Q RE is the second initial capacity of the active element
- ⁇ y is the second state of charge variation.
- the determining the current target state of charge of the battery pack according to the voltage of the third element, the first aging rate and the second aging rate includes:
- the element charge state of the active element is determined by using a preset correspondence relationship, the preset correspondence relationship is the element voltage of the active element and the charge of the active element Correspondence between electrical states;
- the third formula includes:
- x is the target state of charge
- x0 is the first initial state of charge of the battery pack
- y is the state of charge of the component
- y0 is the second initial state of charge of the active component
- Q LFP is the first initial capacity of the battery pack
- Q RE is the second initial capacity of the active components
- f LFP is the first aging rate
- f RE is the second aging rate.
- the device further includes a first voltage sampler and a second voltage sampler, the first voltage sampler is used to collect the element voltage of the active element, and the second voltage sampler is used to collect the The total voltage of the battery pack circuit;
- the active element is arranged outside the battery pack; or, the active element is arranged inside the battery pack.
- the device for determining the state of charge of the battery pack in the present disclosure includes a controller, a battery pack and active components, the battery pack and the active components constitute a battery pack circuit, and the batteries in the battery pack and the active components
- the controller is used to obtain the first total voltage of the battery pack circuit and the first component voltage of the active components at the first power-on moment, and the second total voltage of the battery pack circuit and the active component voltage at the second power-on time
- the first aging rate and the second aging rate of the active element and then obtain the third element voltage of the current active element, and determine the target load of the current battery pack according to the third element voltage, the first aging rate and the second aging rate power state.
- the battery pack is connected in series with the active components to charge and discharge, so that the total voltage of the battery pack circuit can change monotonously with the charging and discharging time, and the current battery pack is determined by the total voltage of the battery pack circuit and the component voltage of the active components
- the target state of charge of the battery pack improves the accuracy of determining the state of charge of the battery pack.
- FIG. 1 is a schematic diagram of a device for determining the state of charge of a battery pack according to an embodiment of the present disclosure
- FIG. 2 is a schematic diagram of another device for determining the state of charge of a battery pack according to another embodiment of the present disclosure
- FIG. 3 is a schematic diagram of another device for determining the state of charge of a battery pack according to another embodiment of the present disclosure
- Fig. 4 is a flow chart of another method for determining the state of charge of a battery pack according to another embodiment of the present disclosure
- FIG. 5 is a flowchart of a step 202 shown in the embodiment shown in FIG. 4;
- FIG. 6 is a flowchart of a step 203 shown in the embodiment shown in FIG. 4 .
- Fig. 1 is a block diagram of a device for determining the state of charge of a battery pack according to an exemplary embodiment.
- the device 100 includes a controller 101, a battery pack 102 and an active element 103, the controller 101 is connected to the battery pack 102, the battery pack 102 and the active element 103 constitute a battery pack circuit, and the battery pack 102 The electric core is connected in series with the active element 103 .
- the controller 101 is configured to obtain the first element voltage of the active element 103 and the first total voltage of the battery pack circuit at the first power-on moment, and the second element voltage of the active element 103 and the battery pack circuit voltage at the second power-on moment. The second total voltage and the electric quantity passing through the battery pack circuit from the first power-on moment to the second power-on moment.
- the active element 103 can be introduced, and the charge of the battery pack 102 can be calculated by observing the element voltage of the active element 103 State (ie SOC).
- the battery pack 102 and the active element 103 can be connected in series (at this moment, the battery pack 102 and the active element 103 constitute a battery pack circuit), and when a current passes through the battery pack circuit, the active element 103 can generate a component voltage, and the element voltage can monotonically change with the charging/discharging time, and the element voltage will be coupled with the battery voltage of the battery pack 102, so that the curve of the total voltage of the battery pack circuit (that is, the sum of the element voltage and the battery voltage at the same time) No longer flat, but monotonically varying with charge/discharge time.
- the active element 103 can be arranged outside the battery pack 102 or inside the battery pack 102 .
- the first aging rate of the battery pack 102 and the second aging rate of the active component 103 can then be determined.
- the first total voltage of the battery pack circuit and the first element voltage of the active element 103 at the first energization moment can be obtained by the controller 101
- the second total voltage of the battery pack circuit and the active element 103 voltage at the second energization moment can be obtained by the controller 101.
- the controller 101 may be any processor with a control function, for example, it may be a BMS (English: Battery Management System, Chinese: Battery Management System).
- the battery pack 102 may be any type of battery pack, such as an LFP battery pack.
- the active element 103 can be understood as a circuit element used to change the curve shape of the battery voltage of the battery pack 102, for example, it can be a battery of a ternary NMC (Chinese: nickel cobalt lithium manganate) system, a lithium cobalt oxide battery, a cobalt-free Active components such as batteries, capacitors, supercapacitors, etc.
- the controller 101 is further configured to determine a first aging rate of the battery pack 102 and a second aging rate of the active element 103 according to the first element voltage, the second element voltage, the first total voltage, the second total voltage and the electric quantity.
- V p V LFP + V RE , where V p is the total voltage of the battery pack circuit, V LFP is the battery voltage of the battery pack 102, and V RE is The element voltage of the active element 103 .
- V LFP V p -V RE . Therefore, the controller 101 can use the difference between the first total voltage and the first element voltage as the first battery voltage of the battery pack 102 at the first power-on moment, and use the difference between the second total voltage and the second element voltage as, as the second battery voltage of the battery pack 102 at the second power-on moment.
- the controller 101 can determine the first state of charge variation of the battery pack 102 according to the first battery voltage and the second battery voltage.
- the controller 101 can determine the second state of charge variation of the active element 103 according to the first element voltage and the second element voltage.
- the third state of charge and the fourth state of charge of the active element 103 at the second energization moment, and the difference between the fourth state of charge and the third state of charge is used as the second state of charge change.
- the controller 101 may determine the first aging rate and the second aging rate according to the first change amount of the state of charge, the second change amount of the state of charge and the electric quantity. For example, the controller 101 may use a first formula to determine the first aging rate.
- f LFP is the first aging rate
- Q LFP is the first initial capacity of the battery pack 102
- ⁇ Q is the electric quantity
- ⁇ x is the first state of charge variation.
- the controller 101 can determine the second aging rate by using the second formula.
- f RE is the second aging rate
- Q RE is the second initial capacity of the active element 103
- ⁇ y is the second state of charge variation.
- the controller 101 is further configured to acquire the current third element voltage of the active element 103, and determine the current target state of charge of the battery pack 102 according to the third element voltage, the first aging rate and the second aging rate.
- the controller 101 may first determine the element charge state of the current active element 103 according to the third element voltage and use a preset correspondence relationship.
- the controller 101 can use the third formula to determine the target state of charge.
- the third formula includes: x is the target state of charge, x 0 is the first initial state of charge of the battery pack 102, y is the element state of charge, y 0 is the second initial state of charge of the active element 103, Q LFP is the first initial state of charge of the battery pack An initial capacity, Q RE is the second initial capacity of the active element 103, f LFP is the first aging rate, and f RE is the second aging rate. It can be seen from the third formula that the process of determining the target state of charge is actually a process of inferring the target state of charge from the state of charge of the active components 103.
- the OCV- The effect of SOC curve flatness on the accuracy of calculating the target state of charge, so as to ensure that the accurate target state of charge is obtained.
- the controller 101 may introduce the target state of charge into the estimation of other state parameters of the battery pack 102 .
- the target state of charge can be introduced into the SOH (English: State of Health, Chinese: State of Life), SOE (English: State of Energy, Chinese: battery net accumulative charge and discharge capacity), power and remaining mileage of the battery pack 102 estimate.
- the controller 101 may periodically update the first aging rate and the second aging rate (for example, once a month), that is, Periodically, a first aging rate and a second aging rate are determined according to the first total voltage, the second total voltage, the first element voltage, the second element voltage and the electric quantity.
- the device 100 for determining the state of charge of a battery pack in the present disclosure includes a controller 101, a battery pack 102 and an active element 103, the battery pack 102 and the active element 103 constitute a battery pack circuit, and the battery pack 102
- the battery cell is connected in series with the active element 103, and the controller 101 is used to obtain the first total voltage of the battery pack circuit and the first element voltage of the active element 103 at the first power-on moment, and the battery pack circuit at the second power-on moment
- the second total voltage and electric quantity determine the first aging rate of the battery pack 102 and the second aging rate of the active element 103, and then obtain the third element voltage of the current active element 103, and according to the third element voltage, the
- the battery pack 102 is connected in series with the active element 103 to charge and discharge, so that the total voltage of the battery pack circuit can change monotonously with the charging and discharging time, and is determined by the total voltage of the battery pack circuit and the element voltage of the active element 103
- the current target state of charge of the battery pack 102 improves the accuracy of determining the state of charge of the battery pack 102 .
- the third formula can be derived in the following way:
- the state of charge of the active element 103 at any time is:
- the state of charge of the battery pack 102 is:
- I is the current flowing through the battery pack circuit, I>0 when the battery pack 102 is charging, and I ⁇ 0 when the battery pack 102 is discharging.
- the device 100 further includes a first voltage sampler 104 and a second voltage sampler 105, the first voltage sampler 104 is used to collect the element voltage of the active element 103, and the second voltage sampler 105 is used to collect the voltage of the battery pack the total voltage of the circuit.
- the active element 103 is provided outside the battery pack 102 .
- the active element 103 is disposed inside the battery pack 102 .
- the device 100 may include a first voltage sampler 104 for collecting the element voltage of the active element 103 , and a second voltage sampler 105 for collecting the total voltage of the battery pack circuit.
- the active element 103 can be arranged outside the battery pack 102, the first voltage sampler 104 is used to collect the element voltage of the active element 103, and the second voltage sampler 105 is used to collect The total voltage of the battery pack circuit. It should be noted that the capacity of the active component 103 needs not to be lower than the capacity of the battery pack 102 .
- the active element 103 can be arranged inside the battery pack 102 (at this time, the active element 103 is mixed with the cells inside the battery pack 102 ).
- the first voltage sampler 104 is used to collect the element voltage of the active element 103
- the second voltage sampler 105 is used to collect the total voltage of the battery pack circuit.
- the active element 103 when the active element 103 is connected in series with any LFP cell in the battery pack 102, the following conditions need to be met: 1) The size of the active element 103 must match the battery pack 102, if there are multiple rows of batteries in the battery pack 102 When the cells are connected in series and there is only one active element 103 , the size of the active element 103 should be exactly the same as the cell of the battery pack 102 . 2) The capacity of the active element 103 should match the battery pack 102, for example, the active element 103 and the battery pack 102 need to satisfy at any time: Q RE ⁇ f RE ⁇ Q LFP ⁇ f LFP . 3) When the cells of the battery pack 102 and the active components 103 are connected in series to form a package, the SOC must be reasonably matched. For example, the active components 103 and the battery pack 102 need to meet:
- the device 100 for determining the state of charge of a battery pack in the present disclosure includes a controller 101, a battery pack 102 and an active element 103, the battery pack 102 and the active element 103 constitute a battery pack circuit, and the battery pack 102
- the battery cell is connected in series with the active element 103, and the controller 101 is used to obtain the first total voltage of the battery pack circuit and the first element voltage of the active element 103 at the first power-on moment, and the battery pack circuit at the second power-on moment
- the second total voltage and electric quantity determine the first aging rate of the battery pack 102 and the second aging rate of the active element 103, and then obtain the third element voltage of the current active element 103, and according to the third element voltage, the
- the battery pack 102 is connected in series with the active element 103 to charge and discharge, so that the total voltage of the battery pack circuit can change monotonously with the charging and discharging time, and is determined by the total voltage of the battery pack circuit and the element voltage of the active element 103
- the current target state of charge of the battery pack 102 improves the accuracy of determining the state of charge of the battery pack 102 .
- Fig. 4 is a flowchart showing a method for determining the state of charge of the battery pack 102 according to an exemplary embodiment. As shown in FIG. 4 , it is applied to a device 100 for determining the state of charge of a battery pack.
- the device 100 includes a battery pack 102 and an active element 103.
- the battery pack 102 and the active element 103 constitute a battery pack circuit, and the battery pack 102
- the electric core is connected in series with the active element 103, and the method may include the following steps:
- Step 201 obtain the first element voltage of the active element and the first total voltage of the battery pack circuit at the first energization moment, the second element voltage of the active element and the second total voltage of the battery pack circuit at the second energization moment, and The amount of electricity passing through the battery pack circuit from the first power-on moment to the second power-on moment.
- Step 202 according to the first element voltage, the second element voltage, the first total voltage, the second total voltage and the electric quantity, determine the first aging rate of the battery pack and the second aging rate of the active element.
- Step 203 acquire the third element voltage of the current active element, and determine the current target state of charge of the battery pack according to the third element voltage, the first aging rate and the second aging rate.
- FIG. 5 is a flowchart of a step 202 shown in the embodiment shown in FIG. 4 .
- step 202 may include the following steps:
- Step 2021 use the difference between the first total voltage and the voltage of the first element as the first battery voltage of the battery pack at the first power-on moment, and use the difference between the second total voltage and the voltage of the second element as the voltage at the second The second battery voltage of the battery pack at power-on time.
- Step 2022 according to the first battery voltage and the second battery voltage, determine the first state of charge variation of the battery pack.
- Step 2023 according to the voltage of the first element and the voltage of the second element, determine the variation of the second state of charge of the active element.
- Step 2024 Determine a first aging rate and a second aging rate according to the first state of charge change, the second state of charge change and the electric quantity.
- step 2024 can be implemented in the following manner:
- a first aging rate is determined.
- f LFP is the first aging rate
- Q LFP is the first initial capacity of the battery pack
- ⁇ Q is the electric quantity
- ⁇ x is the change amount of the first state of charge.
- a second aging rate is determined.
- f RE is the second aging rate
- Q RE is the second initial capacity of the active element
- ⁇ y is the second state of charge variation.
- FIG. 6 is a flowchart of a step 203 shown in the embodiment shown in FIG. 4 .
- step 203 may include the following steps:
- Step 2031 according to the voltage of the third element, using the preset corresponding relationship to determine the current state of charge of the active element, the preset corresponding relationship is the corresponding relationship between the element voltage of the active element and the state of charge of the active element .
- Step 2032 using the third formula to determine the target state of charge.
- the third formula includes: x is the target SOC, x 0 is the first initial SOC of the battery pack, y is the component SOC, y 0 is the second initial SOC of the active components, Q LFP is the first initial SOC of the battery pack capacity, Q RE is the second initial capacity of the active component, f LFP is the first aging rate, and f RE is the second aging rate.
- the device 100 also includes a first voltage sampler 104 and a second voltage sampler 105, the first voltage sampler 104 is used to collect the element voltage of the active element 103, and the second voltage sampler 105 is used to collect the voltage of the battery The total voltage of the package circuit.
- Active elements 103 are provided outside the battery pack. Alternatively, the active element 103 is disposed inside the battery pack.
- the device 100 for determining the state of charge of a battery pack in the present disclosure includes a controller 101, a battery pack 102 and an active element 103, the battery pack 102 and the active element 103 constitute a battery pack circuit, and the battery pack 102
- the battery cell is connected in series with the active element 103, and the controller 101 is used to obtain the first total voltage of the battery pack circuit and the first element voltage of the active element 103 at the first power-on moment, and the battery pack circuit at the second power-on moment
- the second total voltage and electric quantity determine the first aging rate of the battery pack 102 and the second aging rate of the active element, and then obtain the third element voltage of the current active element 103, and according to the third element voltage, the first
- the battery pack 102 is connected in series with the active element 103 to charge and discharge, so that the total voltage of the battery pack circuit can change monotonously with the charging and discharging time, and is determined by the total voltage of the battery pack circuit and the element voltage of the active element 103
- the current target state of charge of the battery pack 102 improves the accuracy of determining the state of charge of the battery pack 102 .
- first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as “first” and “second” may explicitly or implicitly include one or more of these features.
- “plurality” means two or more, unless otherwise clearly and specifically defined.
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Claims (10)
- 一种确定电池包荷电状态的装置,其特征在于,所述装置包括控制器,电池包和有源元件,所述控制器与所述电池包连接,所述电池包与所述有源元件构成电池包电路,且所述电池包的电芯与所述有源元件串联;所述控制器,用于获取在第一通电时刻所述有源元件的第一元件电压和所述电池包电路的第一总电压,在第二通电时刻所述有源元件的第二元件电压和所述电池包电路的第二总电压以及从所述第一通电时刻至所述第二通电时刻通过所述电池包电路的电量;所述控制器,还用于根据所述第一元件电压,所述第二元件电压,所述第一总电压,所述第二总电压和所述电量,确定所述电池包的第一老化速率和所述有源元件的第二老化速率;所述控制器,还用于获取当前所述有源元件的第三元件电压,并根据所述第三元件电压,所述第一老化速率和所述第二老化速率,确定当前所述电池包的目标荷电状态。
- 根据权利要求1所述的装置,其特征在于,所述控制器用于:将所述第一总电压与所述第一元件电压的差值,作为在所述第一通电时刻所述电池包的第一电池电压,并将所述第二总电压与所述第二元件电压的差值,作为在所述第二通电时刻所述电池包的第二电池电压;根据所述第一电池电压和所述第二电池电压,确定所述电池包的第一荷电状态变化量;根据所述第一元件电压和所述第二元件电压,确定所述有源元件的第二荷电状态变化量;根据所述第一荷电状态变化量,所述第二荷电状态变化量和所述电量,确定所述第一老化速率和所述第二老化速率。
- 根据权利要求2所述的装置,其特征在于,所述控制器用于:利用第一公式,确定所述第一老化速率;所述第一公式包括:f LFP=Q LFP-ΔQ/Δx;其中,f LFP为所述第一老化速率,Q LFP为所述电池包的第一初始容量,ΔQ为所述电量,Δx为所述第一荷电状态变化量;利用第二公式,确定所述第二老化速率;所述第二公式包括:f RE=Q RE-ΔQ/Δy;其中,f RE为所述第二老化速率,Q RE为所述有源元件的第二初始容量,Δy为所述第二荷电状态变化量。
- 根据权利要求1-4中任一项所述的装置,其特征在于,所述装置还包括第一电压采样器和第二电压采样器,所述第一电压采样器用于采集所述有源元件的元件电压,所述第二电压采样器用于采集所述电池包电路的总电压;所述有源元件设置在所述电池包外部;或者,所述有源元件设置在所述电池包内部。
- 一种确定电池包荷电状态的方法,其特征在于,应用于确定电池包荷电状态的装置,所述装置包括电池包和有源元件,所述电池包与所述有源元件构成电池包电路,且所述电池包中的电芯与所述有源元件串联,所述方法包括:获取在第一通电时刻所述有源元件的第一元件电压和所述电池包电路的第一总电压,在第二通电时刻所述有源元件的第二元件电压和所述电池包电路的第二总电压以及从所述第一通电时刻至所述第二通电时刻通过所述电池包电路的电量;根据所述第一元件电压,所述第二元件电压,所述第一总电压,所述第二总电压和所述电量,确定所述电池包的第一老化速率和所述有源元件的第二老化速率;获取当前所述有源元件的第三元件电压,并根据所述第三元件电压,所述第一老化速率和所述第二老化速率,确定当前所述电池包的目标荷电状态。
- 根据权利要求6所述的方法,其特征在于,所述根据所述第一元件电压,所述第二元件电压,所述第一总电压,所述第二总电压和所述电量,确定所述电池包的第一老化速率和所述有源元件的第二老化速率,包括:将所述第一总电压与所述第一元件电压的差值,作为在所述第一通电时刻所述电池包的第一电池电压,并将所述第二总电压与所述第二元件电压的差值,作为在所述第二通电时刻所述电池包的第二电池电压;根据所述第一电池电压和所述第二电池电压,确定所述电池包的第一荷电状态变化量;根据所述第一元件电压和所述第二元件电压,确定所述有源元件的第二荷电状态变化量;根据所述第一荷电状态变化量,所述第二荷电状态变化量和所述电量,确定所述第一老化速率和所述第二老化速率。
- 根据权利要求7所述的方法,其特征在于,所述根据所述第一荷电状态变化量,所述第二荷电状态变化量和所述电量,确定所述第一老化速率和所述第二老化速率,包括:利用第一公式,确定所述第一老化速率;所述第一公式包括:f LFP=Q LFP-ΔQ/Δx;其中,f LFP为所述第一老化速率,Q LFP为所述电池包的第一初始容量,ΔQ为所述电量,Δx为所述第一荷电状态变化量;利用第二公式,确定所述第二老化速率;所述第二公式包括:f RE=Q RE-ΔQ/Δy;其中,f RE为所述第二老化速率,Q RE为所述有源元件的第二初始容量,Δy为所述第二荷电状态变化量。
- 根据权利要求6-8中任一项所述的方法,其特征在于,所述根据所述第三元件电压,所述第一老化速率和所述第二老化速率,确定当前所述电池包的目标荷电状态,包括:根据所述第三元件电压,利用预设对应关系,确定当前所述有源元件的元件荷电状态,所述预设对应关系为所述有源元件的元件电压与所述有源元件的荷电状态之间的对应关系;利用第三公式,确定所述目标荷电状态;所述第三公式包括:其中,x为所述目标荷电状态,x 0为所述电池包的第一初始荷电状态,y为所述元件荷电状态,y 0为所述有源元件的第二初始荷电状态,Q LFP为所述电池包的第一初始容量,Q RE为所述有源元件的第二初始容量,f LFP为所述第一老化速率,f RE为所述第二老化速率。
- 根据权利要求6-9中任一项所述的方法,其特征在于,所述装置还包括第一电压采样器和第二电压采样器,所述第一电压采样器用于采集所述有源元件的元件电压,所述第二电压采样器用于采集所述电池包电路的总电压;所述有源元件设置在所述电池包外部;或者,所述有源元件设置在所述电池包内部。
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