TWI586980B - State of charge estimation method for lithium-ion battery and estimation system - Google Patents
State of charge estimation method for lithium-ion battery and estimation system Download PDFInfo
- Publication number
- TWI586980B TWI586980B TW103121412A TW103121412A TWI586980B TW I586980 B TWI586980 B TW I586980B TW 103121412 A TW103121412 A TW 103121412A TW 103121412 A TW103121412 A TW 103121412A TW I586980 B TWI586980 B TW I586980B
- Authority
- TW
- Taiwan
- Prior art keywords
- lithium iron
- iron battery
- residual
- estimating
- residual capacity
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 77
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title description 4
- 229910001416 lithium ion Inorganic materials 0.000 title description 4
- QSNQXZYQEIKDPU-UHFFFAOYSA-N [Li].[Fe] Chemical compound [Li].[Fe] QSNQXZYQEIKDPU-UHFFFAOYSA-N 0.000 claims description 112
- 238000000638 solvent extraction Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000010354 integration Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- WFGBXPXOFAFPTO-UHFFFAOYSA-N [P].[Fe].[Li] Chemical compound [P].[Fe].[Li] WFGBXPXOFAFPTO-UHFFFAOYSA-N 0.000 description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229910052493 LiFePO4 Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- KLARSDUHONHPRF-UHFFFAOYSA-N [Li].[Mn] Chemical compound [Li].[Mn] KLARSDUHONHPRF-UHFFFAOYSA-N 0.000 description 1
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Description
本發明是有關於鋰鐵電池殘電量估測方法，特別是有關於一種可同時應用於放電時及充電時之鋰鐵電池殘電量估測方法。 The invention relates to a method for estimating the residual electric quantity of a lithium iron battery, in particular to a method for estimating the residual electric quantity of a lithium iron battery which can be simultaneously applied during discharge and during charging.
鋰離子電池是電動車的主要動力來源，電池種類眾多，常見的鋰離子電池如鋰鈷電池、鋰錳電池、鋰鐵磷電池及鎳鈷錳三元素電池等。 Lithium-ion batteries are the main source of power for electric vehicles. There are many types of batteries, such as lithium-ion batteries, lithium-manganese batteries, lithium-iron-phosphorus batteries, and nickel-cobalt-manganese three-element batteries.
其中以鋰鐵磷(LiFePO4)電池應用最為廣泛，原因是鋰鐵磷電池具有高能量密度、功率密度、自放電率極低與零環境汙染等優點，再加上其過充過放時不會發生自燃與***的危險，被公認為是非常安全的儲能裝置，因此較適合作為電動車的動力來源。然而鋰鐵磷電池組在管理上較為困難，通常需要搭配電池管理系統進行管理，電池管理系統功能包含量測單電芯電壓及電流、過充過放的保護機制、殘電量估測，藉此提供完善的充電機制。 Among them, lithium iron phosphate (LiFePO4) battery is the most widely used, because lithium iron phosphorus battery has the advantages of high energy density, power density, low self-discharge rate and zero environmental pollution, plus it will not be overcharged and over-discharged. The danger of spontaneous combustion and explosion is recognized as a very safe energy storage device, so it is more suitable as a power source for electric vehicles. However, lithium iron phosphate battery packs are difficult to manage, and usually need to be managed with a battery management system. The battery management system function includes measuring the voltage and current of a single cell, the protection mechanism of overcharge and over discharge, and the residual power estimation. Provide a complete charging mechanism.
殘電量估測不準確是電動車發生拋錨的主要原因，且也會影響消費者對於購買電動車的意願。而目前鋰鐵磷電 池之殘電量估測大致可分為庫倫積分法、開路電壓法、電動勢法及查表法等。 Inaccurate estimation of residual power is the main reason for the breakdown of electric vehicles, and it will also affect consumers' willingness to purchase electric vehicles. Lithium iron phosphate The estimated residual capacity of the pool can be roughly divided into Coulomb integral method, open circuit voltage method, electromotive force method and table look-up method.
然而，在鋰鐵磷電池殘電量位於10%~95%時，其電壓與殘電量辨識度很低，使得前述之庫倫積分法無法估算出正確之殘電量。而其他殘電量估測方法會因環境改變或是電池老化，導致其估測準確度偏移等問題。因此，目前不論以何種殘電量估測法，都無法準確估測鋰鐵磷電池真正的殘電量。 However, when the residual capacity of the lithium iron phosphorus battery is between 10% and 95%, the voltage and residual capacity are very low, which makes the aforementioned Coulomb integral method unable to estimate the correct residual capacity. Other residual power estimation methods may cause problems such as estimation accuracy offset due to environmental changes or battery aging. Therefore, no matter what kind of residual power estimation method is used, it is impossible to accurately estimate the true residual capacity of the lithium iron phosphorus battery.
本發明的目的在於提供一種鋰鐵電池殘電量估測方法，可同時於鋰鐵電池充電及放電時使用，並提高殘電量估測的正確率。 The object of the present invention is to provide a method for estimating the residual electric quantity of a lithium iron battery, which can be used simultaneously in charging and discharging a lithium iron battery, and improve the correct rate of residual power estimation.
因此，本發明之一實施方式是在提供一種鋰鐵電池殘電量估測方法，其步驟包含：一分區步驟，根據鋰鐵電池之一單電芯電壓之一放電曲線設一第一工作反曲點及一第二工作反曲點將鋰鐵電池殘電量分為一低殘電量區、一主殘電量區及一高殘電量區。一低殘電量估測步驟，當鋰鐵電池殘電量位於低殘電量區，利用一電動勢法估測鋰鐵電池殘電量。一主殘電量估測步驟，當鋰鐵電池殘電量位於主殘電量區，利用一庫倫積分法估測鋰鐵電池殘電量。以及一高殘電量估測步驟，當鋰鐵電池殘電量位於高殘電量區，利用電動勢法估測鋰鐵電池殘電量。 Therefore, an embodiment of the present invention provides a method for estimating a residual capacity of a lithium iron battery, the method comprising: a partitioning step of setting a first work recursion according to a discharge curve of one of the single cell voltages of the lithium iron battery The point and a second work recurve point divide the residual capacity of the lithium iron battery into a low residual power area, a main residual power area and a high residual power area. A low residual power estimation step, when the residual capacity of the lithium iron battery is located in the low residual power area, an electromotive force method is used to estimate the residual capacity of the lithium iron battery. A main residual power estimation step, when the residual capacity of the lithium iron battery is located in the main residual power area, the residual power of the lithium iron battery is estimated by a Coulomb integral method. And a high residual power estimation step, when the residual capacity of the lithium iron battery is located in the high residual capacity area, the residual electric quantity of the lithium iron battery is estimated by the electromotive force method.
依據本發明一實施例，上述庫倫積分法係每0.5秒之週期量測鋰鐵電池一電流變化量。 According to an embodiment of the invention, the Coulomb integration method measures a current variation of the lithium iron battery every 0.5 second period.
依據本發明另一實施例，前述庫倫積分法估測鋰鐵
電池殘電量之公式為：
依據本發明又一實施例，前述鋰鐵電池殘電量估測方法更包含一校正步驟，於進行五次主殘電量估測步驟後，校正鋰鐵電池之額定安時數。 According to still another embodiment of the present invention, the method for estimating the residual capacity of the lithium iron battery further includes a calibration step of correcting the rated hours of the lithium iron battery after performing the fifth main residual power estimation step.
依據本發明再一實施例，前述鋰鐵電池殘電量估測方法更包含一換算步驟，將單電芯電壓換算成一單電芯之一電動勢，換算步驟之公式為：
依據本發明另一實施例，其中定義鋰鐵電池之額定安時數為100%，低殘電量區為10%以下，主殘電量區為10%~95%，高殘電量區為95%以上。 According to another embodiment of the present invention, the rated hours of the lithium iron battery are defined as 100%, the low residual capacity area is 10% or less, the main residual power area is 10% to 95%, and the high residual capacity area is 95% or more. .
本發明之另一實施方式是在提供一種估測系統應用前述之鋰鐵電池殘電量估測方法，其中以一資料擷取單元、一計算單元及一資料庫與鋰鐵電池電性連接，以擷取單電芯電壓而獲得放電曲線。 Another embodiment of the present invention provides an estimation system using the foregoing lithium iron battery residual power estimation method, wherein a data acquisition unit, a calculation unit and a database are electrically connected to the lithium iron battery, A single cell voltage is drawn to obtain a discharge curve.
由此可知，前述實施方式及實施例之鋰鐵電池殘電量估測方法，根據鋰鐵電池之單電芯的放電特性將鋰鐵電池 殘電量區分為低殘電量區、主殘電量區及高殘電量區，並因應不同的殘電量區分別使用庫倫積分法及電動勢法來估測鋰鐵電池殘電量，藉此提高鋰鐵電池殘電量估測之可靠度。 Therefore, it can be seen that the lithium iron battery residual capacity estimation method according to the foregoing embodiments and examples, the lithium iron battery according to the discharge characteristics of the single battery of the lithium iron battery The residual power is divided into low residual power area, main residual power area and high residual power area, and the coulombic integral method and electromotive force method are used to estimate the residual capacity of lithium iron battery according to different residual power areas, thereby improving the lithium iron battery residual The reliability of the power estimation.
100‧‧‧分區步驟 100‧‧‧ partitioning steps
200‧‧‧低殘電量估測步驟 200‧‧‧ Low residual capacity estimation procedure
300‧‧‧主殘電量估測步驟 300‧‧‧Main residual power estimation steps
400‧‧‧高殘電量估測步驟 400‧‧‧High residual capacity estimation procedure
500、510、511、512、520、521、522‧‧‧步驟 500, 510, 511, 512, 520, 521, 522 ‧ ‧ steps
600‧‧‧估測系統 600‧‧‧ Estimation System
610‧‧‧資料擷取單元 610‧‧‧Information acquisition unit
620‧‧‧計算單元 620‧‧‧Computation unit
630‧‧‧資料庫 630‧‧‧Database
700‧‧‧鋰鐵電池 700‧‧‧Lithium iron battery
C‧‧‧放電曲線 C‧‧‧discharge curve
W1‧‧‧第一工作反曲點 W1‧‧‧ first work recurve
W2‧‧‧第二工作反曲點 W2‧‧‧ second work recurve
第1圖係繪示鋰鐵電池中單電芯之放電曲線圖。 Figure 1 is a graph showing the discharge curve of a single cell in a lithium iron battery.
第2圖係繪示依照本發明之一實施方式的一種鋰鐵電池殘電量估測方法之流程圖。 2 is a flow chart showing a method for estimating a residual capacity of a lithium iron battery according to an embodiment of the present invention.
第3圖係繪示依照本發明之一實施例的一種鋰鐵電池殘電量估測方法之流程圖。 FIG. 3 is a flow chart showing a method for estimating the residual electric quantity of a lithium iron battery according to an embodiment of the present invention.
第4圖係繪示依照應用本發明之一實施方式的一種鋰鐵電池估測方法之估測系統圖。 4 is a diagram showing an estimation system of a method for estimating a lithium iron battery according to an embodiment of the present invention.
請同時參照第1圖及第2圖，其中第1圖係繪示鋰鐵電池中單電芯之放電曲線圖，第2圖係繪示依照本發明之一實施方式的一種鋰鐵電池殘電量估測方法之流程圖，其步驟包含一分區步驟100、一低殘電量估測步驟200、一主殘電量估測步驟300以及一高殘電量估測步驟400。 Please refer to FIG. 1 and FIG. 2 simultaneously, wherein FIG. 1 is a discharge graph of a single battery in a lithium iron battery, and FIG. 2 is a diagram showing a residual capacity of a lithium iron battery according to an embodiment of the present invention. A flow chart of the estimation method includes a partitioning step 100, a low residual power estimation step 200, a primary residual power estimation step 300, and a high residual power estimation step 400.
分區步驟100係根據鋰鐵電池之一單電芯之一放電曲線C一第一工作反曲點W1及一第二工作反曲點W2將鋰鐵電池殘電量分為一低殘電量區、一主殘電量區及一高殘電量區。鋰鐵電池之單電芯電壓之放電曲線C請同時參照第1圖所示，由於鋰鐵電池本身的特性，在殘電量10%以下(即第二工作反曲點W2)或是95%以上(即第一工作反曲點W1) 時，其單電芯之電壓才會有明顯的變化量；在殘電量在10%以上，95%以下時，其電芯之電壓變化量小。因此，定義鋰鐵電池之電池容量為100%時，低殘電量區為10%以下，主殘電量區為10%~95%，高殘電量區為95%以上。 The partitioning step 100 divides the residual capacity of the lithium iron battery into a low residual capacity area according to a discharge curve C of a single cell of the lithium iron battery, a first working inflection point W 1 and a second working inflection point W 2 . , a main residual power area and a high residual power area. The discharge curve C of the single-cell voltage of the lithium-iron battery is also shown in Fig. 1. Due to the characteristics of the lithium-iron battery itself, the residual power is less than 10% (that is, the second work reversal point W2) or 95% or more. (ie, the first working inflection point W1), the voltage of the single cell will have a significant change; when the residual capacity is above 10%, 95% or less, the voltage variation of the cell is small. Therefore, when the battery capacity of the lithium-iron battery is defined as 100%, the low residual capacity area is 10% or less, the main residual power area is 10% to 95%, and the high residual capacity area is 95% or more.
低殘電量估測步驟200係當鋰鐵電池殘電量位於低殘電量區，利用一電動勢法估測鋰鐵電池殘電量。 The low residual power estimation step 200 is to estimate the residual capacity of the lithium iron battery by using an electromotive force method when the residual capacity of the lithium iron battery is in the low residual power area.
而使用電動勢法前，須先使用一換算步驟(未圖示)將單電芯電壓換算成一單電芯之一電動勢，其公式為：
主殘電量估測步驟300係當鋰鐵電池殘電量位於主殘電量區，利用一庫倫積分法估測鋰鐵電池殘電量。庫倫積分法估測鋰鐵電池殘電量之公式為：
高殘電量估測步驟400係當鋰鐵電池殘電量位於高殘電量區，利用電動勢法估測鋰鐵電池殘電量。由於鋰鐵電池本身存在著自放電的問題，尤其在大電流時鋰鐵電池溫度 上升，自放電率更是明顯，因此單獨利用庫倫積分法來估測鋰鐵電池殘電量在長時間運作下可靠度將越來越低，因此需除了主殘電量估測步驟300所使用之庫倫積分法，還需另外搭配低殘電量估測步驟200及高殘電量估測步驟400中之電動勢法來達到互補的效果，進而避免過充與過放的發生或不合理殘電量的預估發生。 The high residual power estimation step 400 is when the residual capacity of the lithium iron battery is located in the high residual power area, and the residual electric quantity of the lithium iron battery is estimated by the electromotive force method. Lithium-iron battery itself has self-discharge problems, especially at high currents. As the rise, the self-discharge rate is more obvious. Therefore, the Coulomb integral method alone is used to estimate that the reliability of the lithium-iron battery residual power will be lower and lower under long-term operation, so the coulomb used in addition to the main residual power estimation step 300 is required. Integral method, it is necessary to additionally match the low residual power estimation step 200 and the electromotive force method in the high residual power estimation step 400 to achieve complementary effects, thereby avoiding the occurrence of overcharge and overdischarge or the estimation of unreasonable residual power. .
此外，前述鋰鐵電池殘電量估測方法更包含一校正步驟(未圖示)，於進行五次主殘電量估測步驟300後，必須針對庫倫積分法進行校正鋰鐵電池之額定安時數。前述進行主殘電量估測步驟300後，隨著鋰鐵電池充放電次數的增加，其額定安時數因老化而下降，因此本實施方式中須記錄鋰鐵電池的額定安時數由充飽電後至殘電量小於10%之安時數，進而可執行額定安時數的校正。 In addition, the foregoing method for estimating the residual capacity of the lithium iron battery further includes a calibration step (not shown), and after performing the fifth main residual power estimation step 300, the rated hours of the lithium iron battery must be corrected for the Coulomb integration method. . After the main residual power estimation step 300 is performed, as the number of times of charging and discharging of the lithium iron battery increases, the rated ampere-hours decreases due to aging. Therefore, in this embodiment, the rated ampere-hours of the lithium-iron battery must be recorded as being fully charged. After the residual power is less than 10% of the number of hours, the calibration of the rated hours can be performed.
請參照第3圖，其係繪示依照本發明之一實施例的一種鋰鐵電池殘電量估測方法之流程圖，其中殘電量(State of Charge，SOC)皆以SOC表示。本實施例實際針對鋰鐵電池之單電芯進行電壓量測，且必須說明以下所列出第一工作反曲點及一第二工作反曲點，其電動勢數值3.35V及3.0V僅供參考，根據鋰鐵電池的不同而有所變化。步驟500，判斷鋰鐵電池是否為放電狀態，如果鋰鐵電池為放電狀態則進行步驟510，判斷單電芯電動勢是否小於3.0V。如果鋰鐵電池不為放電狀態則進行步驟520，判斷單電芯電動勢是否大於3.35V。 Please refer to FIG. 3 , which is a flow chart of a method for estimating the residual power of a lithium iron battery according to an embodiment of the present invention, wherein the State of Charge (SOC) is represented by SOC. In this embodiment, the voltage measurement of the single cell of the lithium iron battery is actually performed, and the first working inflection point and the second working inflection point listed below must be explained, and the electromotive force values of 3.35V and 3.0V are for reference only. According to the lithium iron battery, it varies. In step 500, it is determined whether the lithium iron battery is in a discharged state. If the lithium iron battery is in a discharged state, step 510 is performed to determine whether the single cell electromotive force is less than 3.0V. If the lithium iron battery is not in a discharged state, step 520 is performed to determine whether the single cell electromotive force is greater than 3.35V.
於鋰鐵電池放電狀態下，如果單電芯電動勢小於3.0V則進行步驟511，使用單電芯電動勢法計算SOC。如果單電芯電動勢大於3.0V則進行步驟512，使用庫倫積分法 計算SOC。 In the discharge state of the lithium iron battery, if the single cell electromotive force is less than 3.0 V, step 511 is performed, and the SOC is calculated using the single cell electromotive force method. If the single cell electromotive force is greater than 3.0V, proceed to step 512, using Coulomb integration Calculate the SOC.
於鋰鐵電池非放電狀態(即充電狀態)下，如果單電芯電動勢大於3.35V則進行步驟521，使用電動勢法計算SOC。如果單電芯電動勢小於3.35V則進行步驟522，使用庫倫積分法計算SOC。 In the non-discharge state (ie, state of charge) of the lithium iron battery, if the single cell electromotive force is greater than 3.35 V, step 521 is performed, and the SOC is calculated using the electromotive force method. If the single cell electromotive force is less than 3.35 V, step 522 is performed, and the SOC is calculated using the Coulomb integral method.
由於鋰鐵電池處於放電狀態時，最低單電芯之電動勢小於3.0V，此時電壓變化量較為明顯且於第1圖中之放電曲線C可發現第二工作反曲點W2其電動勢小於3.0V且斜率明顯上升，適合利用電動勢法估算SOC。最低單電芯之電動勢大於3.0V時，則利用庫倫積分法估算SOC。當處於充電狀態，最低單電芯之電動勢大於3.35V，由於電壓變化量較大且於第1圖中之放電曲線C觀察出第一工作反曲點W1其電動勢大於3.35V且斜率升高，因此利用電動勢法估算SOC；最低單電芯之電動勢小於3.35V時，則利用庫倫積分法估算SOC。 Since the lithium-ion battery is in a discharge state, the electromotive force of the lowest single cell is less than 3.0V, and the voltage variation is more obvious at this time. The discharge curve C in Fig. 1 can find that the second working inflection point W 2 has an electromotive force of less than 3.0. V and the slope increase significantly, suitable for estimating the SOC by the electromotive force method. When the electromotive force of the lowest single cell is greater than 3.0V, the SOC is estimated by the Coulomb integral method. When the state of charge, the electromotive force is greater than the minimum single cell 3.35V, the voltage change amount is large and the discharge curve of FIG. 1 in which C a first work W is observed that an inflection point which forces greater than 3.35V and increased slope Therefore, the SOC is estimated by the electromotive force method; when the electromotive force of the lowest single cell is less than 3.35 V, the SOC is estimated by the Coulomb integral method.
其中鋰鐵電池額定安時數的校正步驟舉例說明如下。假若鋰鐵電池出廠時初始之額定安時數為12AH，當鋰鐵電池位於高殘電量區(即第一工作反曲點W1)時，將此設為計算庫倫積分法之初始點。此外，當放電達到低殘電量區(即第二工作反曲點W2)時，將其設為計算庫倫積分法之結束點，此時庫倫積分法所取得之安時數即為低殘電量區至高殘電量區(10%~95%)之安時數，且必須再加上剩餘15%之殘電量，12AH * 0.15=1.8AH，如此方為一完整之鋰鐵電池安時數。接著取出此安時數資料並歸零。重複上述校正步驟五次後，可獲得五筆安時數資料，將其平均並可對初始之額定安時數進行校正。 An example of the calibration procedure for the rated hours of the lithium iron battery is as follows. If the initial rated hours of the lithium-iron battery is 12AH when it leaves the factory, when the lithium-iron battery is located in the high residual capacity area (ie, the first working inflection point W 1 ), this is set as the initial point of the Coulomb integration method. In addition, when the discharge reaches the low residual capacity region (ie, the second working inflection point W 2 ), it is set to calculate the end point of the Coulomb integral method, and the safety time obtained by the Coulomb integral method is the low residual power. The safe time of the area to the high residual capacity area (10%~95%), and must be added with the remaining 15% of the residual power, 12AH * 0.15 = 1.8AH, so that is a complete lithium iron battery safety hours. Then take out the safety time data and return to zero. After repeating the above calibration steps five times, five pens of hourly data are obtained, averaged and the initial rated amperage is corrected.
在此進一步舉例說明利用電勢法如何估測鋰鐵電池對應之殘電量。假若鋰鐵電池位於高殘電量區時(95%以上)時，且其單電芯之最大電動勢為3.65V，並定義單電芯電動勢為X，則依據下列公式可推估其殘電量。 Here, an example of how to estimate the residual power of the lithium iron battery by the potential method is exemplified. If the lithium iron battery is located in the high residual capacity area (more than 95%), and the maximum electromotive force of the single cell is 3.65V, and the single cell electromotive force is defined as X, the residual power can be estimated according to the following formula.
(0.95+0.05 *((X-3.35)/(3.65-3.3)))* 100%；假如鋰鐵電池位於低殘電量區時(10%以下)時，且其單電芯之最小電動勢為2.5V，並定義單電芯電動勢為Y，則依據下列公式可推估其殘電量。 (0.95+0.05 *(( X -3.35)/(3.65-3.3))))* 100%; if the lithium iron battery is in the low residual capacity area (below 10%), and the minimum electromotive force of its single cell is 2.5 V, and define the single cell electromotive force as Y, then the residual power can be estimated according to the following formula.
(0.1 *((Y-2.5)/(3.0-2.5)))* 100%。 (0.1 *(( Y -2.5)/(3.0-2.5))))* 100%.
此外請參照第4圖，其係繪示應用於前述鋰鐵電池殘電量估測方法之估測系統600，係以一資料擷取單元610、一計算單元620及一資料庫630與一鋰鐵電池700電性連接，依照前述實施方式來擷取單電芯電壓而獲得放電曲線，並進行鋰鐵電池殘電量估測。其中電壓截取以及計算方式為本技術領域之通常知識，於此不再多加贅述。 In addition, please refer to FIG. 4 , which illustrates an estimation system 600 applied to the foregoing lithium iron battery residual power estimation method, which is a data acquisition unit 610 , a calculation unit 620 , and a database 630 and a lithium iron . The battery 700 is electrically connected. According to the foregoing embodiment, a single cell voltage is taken to obtain a discharge curve, and a residual capacity of the lithium iron battery is estimated. The voltage interception and calculation methods are common knowledge in the technical field, and will not be further described herein.
由此可知，前述實施方式及實施例之鋰鐵電池殘電量估測方法藉由將鋰鐵電池殘電量分為低殘電量區、一主殘電量區及高殘電量區，使此三階段之鋰鐵電池殘電量估測方法可以在不同殘電量區正確的進行殘電量估測，而且因為在低殘電量區與高殘電量區使用電動勢法，可以有效的對庫倫積分法進行校正，進而避免過充與過放的發生或不合理殘電量的預估發生。 Therefore, the method for estimating the residual capacity of the lithium iron battery in the foregoing embodiments and embodiments is divided into a low residual capacity area, a main residual power area, and a high residual capacity area by the residual capacity of the lithium iron battery, so that the three stages are The method for estimating the residual capacity of lithium-iron battery can correctly estimate the residual capacity in different residual power regions, and because the electromotive force method is used in the low-residue area and the high-residual area, the Coulomb integral method can be effectively corrected to avoid The occurrence of overcharge and overdischarge or the occurrence of unreasonable residual capacity occurs.
雖然本發明已以實施方式揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和 範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and those skilled in the art, without departing from the spirit of the invention, In the scope of the invention, the scope of the invention is defined by the scope of the appended claims.
100‧‧‧分區步驟 100‧‧‧ partitioning steps
200‧‧‧低殘電量估測步驟 200‧‧‧ Low residual capacity estimation procedure
300‧‧‧主殘電量估測步驟 300‧‧‧Main residual power estimation steps
400‧‧‧高殘電量估測步驟 400‧‧‧High residual capacity estimation procedure
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103121412A TWI586980B (en) | 2014-06-20 | 2014-06-20 | State of charge estimation method for lithium-ion battery and estimation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103121412A TWI586980B (en) | 2014-06-20 | 2014-06-20 | State of charge estimation method for lithium-ion battery and estimation system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201600870A TW201600870A (en) | 2016-01-01 |
| TWI586980B true TWI586980B (en) | 2017-06-11 |
Family
ID=55641228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW103121412A TWI586980B (en) | 2014-06-20 | 2014-06-20 | State of charge estimation method for lithium-ion battery and estimation system |
Country Status (1)
| Country | Link |
|---|---|
| TW (1) | TWI586980B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111856178B (en) * | 2020-03-31 | 2021-10-08 | 同济大学 | SOC partition estimation method based on electrochemical characteristics of lithium ion capacitor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201224485A (en) * | 2010-12-02 | 2012-06-16 | Ind Tech Res Inst | State-of-charge estimation method and battery control unit |
| CN101900793B (en) * | 2010-07-30 | 2013-02-27 | 盈正豫顺电子股份有限公司 | Battery discharge residual time estimating method |
| TW201317600A (en) * | 2011-10-26 | 2013-05-01 | Ind Tech Res Inst | Method and system for estimating a capacity a battery |
| TW201413273A (en) * | 2012-09-28 | 2014-04-01 | Metal Ind Res & Dev Ct | Estimating system for state of charge of battery by additive synthesis of two components of mutually perpendicular and estimating method thereof |
-
2014
- 2014-06-20 TW TW103121412A patent/TWI586980B/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900793B (en) * | 2010-07-30 | 2013-02-27 | 盈正豫顺电子股份有限公司 | Battery discharge residual time estimating method |
| TW201224485A (en) * | 2010-12-02 | 2012-06-16 | Ind Tech Res Inst | State-of-charge estimation method and battery control unit |
| TW201317600A (en) * | 2011-10-26 | 2013-05-01 | Ind Tech Res Inst | Method and system for estimating a capacity a battery |
| TW201413273A (en) * | 2012-09-28 | 2014-04-01 | Metal Ind Res & Dev Ct | Estimating system for state of charge of battery by additive synthesis of two components of mutually perpendicular and estimating method thereof |
| US20140095090A1 (en) * | 2012-09-28 | 2014-04-03 | Metal Industries Research & Development Centre | Residual battery capacity estimation system that adds two mutually perpendicular components and the method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201600870A (en) | 2016-01-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107991623B (en) | Battery ampere-hour integral SOC estimation method considering temperature and aging degree | |
| Lai et al. | Electrical behavior of overdischarge-induced internal short circuit in lithium-ion cells | |
| TWI633694B (en) | Detection method of li plating, method and apparatus for charging secondary battery and secondary battery system using the same | |
| CN107576918B (en) | Method and system for estimating residual electric quantity of lithium battery | |
| EP2762907B1 (en) | Apparatus and method for estimating state of charge of battery | |
| CN103823188B (en) | Method for evaluating health state of lithium ion battery pack | |
| CN103163480B (en) | The appraisal procedure of lithium battery health status | |
| CN103969587B (en) | A kind of hybrid vehicle electrokinetic cell SOC estimation method | |
| KR101238478B1 (en) | The Measurment Method of Battery SOC | |
| US10236702B2 (en) | Method and apparatus for rapidly charging battery | |
| CN107677965B (en) | A kind of lithium battery energy state evaluation method | |
| US10073145B2 (en) | Method and system for estimating state of charge of battery | |
| CN105021996A (en) | Battery SOH (section of health) estimation method of energy storage power station BMS (battery management system) | |
| CN107247235A (en) | A kind of battery capacity evaluation method for considering batteries in parallel connection difference | |
| US11095130B2 (en) | Power storage apparatus for estimating an open-circuit voltage | |
| CN102565716A (en) | Apparatus for calculating residual capacity of secondary battery | |
| Purwadi et al. | State of Charge estimation method for lithium battery using combination of Coulomb Counting and Adaptive System with considering the effect of temperature | |
| CN107861074B (en) | Lithium battery SOC estimation method | |
| CN107436412B (en) | Method for estimating power of power battery based on self-learning | |
| CN111007411B (en) | Electric quantity state correction method of energy storage battery system | |
| CN104730464A (en) | Method for testing adiabatic temperature rise rate of battery | |
| TWI586980B (en) | State of charge estimation method for lithium-ion battery and estimation system | |
| CN103872727A (en) | Method for determining largest use current of lithium-ion battery | |
| JP2020079764A (en) | Secondary-battery state determination method | |
| Xu et al. | State of charge estimation based on improved LiFePO4 battery model and Kalman filtering |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |