CN103278760A - Estimating method for power-type lithium ion battery remaining capacity under different temperature environments - Google Patents

Estimating method for power-type lithium ion battery remaining capacity under different temperature environments Download PDF

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CN103278760A
CN103278760A CN2013101779418A CN201310177941A CN103278760A CN 103278760 A CN103278760 A CN 103278760A CN 2013101779418 A CN2013101779418 A CN 2013101779418A CN 201310177941 A CN201310177941 A CN 201310177941A CN 103278760 A CN103278760 A CN 103278760A
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lithium ion
ion battery
under
power
discharge
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CN103278760B (en
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武国良
徐冰亮
董尔佳
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State Grid Corp of China SGCC
Heilongjiang Electric Power Research Institute
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State Grid Corp of China SGCC
Heilongjiang Electric Power Research Institute
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Abstract

The invention discloses an estimating method for power-type lithium ion battery remaining capacity under different temperature environments and relates to the field of power-type lithium ion battery remaining capacity estimation. The invention aims to solve the problem that the influence of the temperature on the battery remaining capacity is not considered by adopting a traditional estimating method for the battery remaining capacity. The estimating method for the power-type lithium ion battery remaining capacity under the different temperature environments comprises the following steps: I, conducting a discharge test of 6 multiplying power on a lithium ion battery under six temperature conditions; II, selecting 10C multiplying power as highest discharge current and 1/3C multiplying power as lowest discharge current to obtain Peukert factors K and n of the six temperature conditions; III, performing curve fitting on six points to obtain a fitting formula taking T as an independent variable and k as a dependent variable; IV, performing curve fitting on six points to obtain a fitting formula taking T as the independent variable and n as the dependent variable; V, establishing an available capacity formula; and VI, substituting Cava, I and T into a battery remaining capacity formula (4) to estimate the power-type lithium ion battery remaining capacity under the different temperature environments. The estimating method for the power-type lithium ion battery remaining capacity under the different temperature environments disclosed by the invention is applied to the field of the battery remaining capacity estimation.

Description

Power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment
Technical field
The present invention relates to power-type lithium ion battery remaining capacity estimation field.
Background technology
The application under the normal temperature condition is mainly considered in the research of battery dump energy, and is less to the battery dump energy Estimation Study under the different temperatures environment.Traditional Peukert equation is a kind of method of estimating battery dump energy, but does not also take into full account temperature effect.
The estimation of battery active volume, the most famous method are the Peukert equations of Peukert proposition in 1897, and this equation has been described the relation of battery active volume and discharge current, and have obtained accepting more widely, and this formula is:
C ava,I=K*I (1-n)
Wherein, K and n are constant, are called Peukert COEFFICIENT K and n.
But this formula is not considered the effect of temperature in active volume is estimated.
Summary of the invention
The present invention will solve existing estimation method of battery dump energy not consider temperature to the problem of the influence of battery dump energy, and the method for estimating remaining capacity of the power-type lithium ion battery under the different temperatures environment is provided.
Power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment is realized according to the following steps:
One, with lithium ion battery under T1=35 ℃ temperature conditions, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C1, C 7C1, C 5C1, C 3C1, C 1C1, C 1/3C1
Lithium ion battery under T2=25 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2
Lithium ion battery under T3=10 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3
Lithium ion battery under T4=0 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C4, C 7C4, C 5C4, C 3C4, C 1C4, C 1/3C4
Lithium ion battery under T5=-10 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5
Lithium ion battery under T6=-15 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6
Two, select the 10C multiplying power to be the highest discharge current, the 1/3C multiplying power is minimum discharge current:
With I 10C1, I 1/3C1, C 10C1And C 1/3C1Be computational data, obtaining at the Peukert of T1=35 ℃ of temperature conditions coefficient is k1 and n1;
With I 10C2, I 1/3C2, C 10C2And C 1/3C2Be computational data, obtain at the Peukert of T2=25 ℃ of temperature conditions coefficient k 2 and n2;
With I 10C3, I 1/3C3, C 10C3And C 1/3C3Be computational data, obtain at the Peukert of T3=10 ℃ of temperature conditions coefficient k 3 and n3;
With I 10C4, I 1/3C4, C 10C4And C 1/3C4Be computational data, obtain at the Peukert of T4=0 ℃ of temperature conditions coefficient k 4 and n4;
With I 10C5, I 1/3C5, C 10C5And C 1/3C5Be computational data, obtain at the Peukert of T5=-10 ℃ of temperature conditions coefficient k 5 and n5;
With I 10C6, I 1/3C6, C 10C6And C 1/3C6Be computational data, obtain at the Peukert of T6=-15 ℃ of temperature conditions coefficient k 6 and n6;
Three, with T being transverse axis, is the longitudinal axis with the k axle, to six point (T1, k 1), (T2, k 2), (T3, k 3),
(T4, k 4), (T5, k 5) and (T6, k 6) carry out curve fitting, and use least square method, obtaining with T is independent variable, is the fitting formula of dependent variable with k,
k(T)=a 4T 4+a 3T 3+a 2T 2+a 1T+a 0????(1)
Four, with T being transverse axis, is the longitudinal axis with the n axle, to six point (T1, n 1), (T2, n 2), (T3, n 3), (T4, n 4), (T5, n 5) and (T6, n 6) carry out curve fitting, and use least square method, obtaining with T is independent variable, is the fitting formula of dependent variable with n,
n(T)=b 4T 4+b 3T 3+b 2T 2+b 1T+b 0????(2)
Five, the active volume formula is:
C ava , I , T = k ( T ) I ( 1 - n ( T ) ) = ( a 4 T 4 + a 3 T 3 + a 2 T 2 + a 1 T + a 0 ) * I ( 1 - ( b 4 T 4 + b 3 T 3 + b 2 T 2 + b 1 T + b 0 ) ) , I ⊆ [ I 1 / 3 C A , I 10 C A ]
(3) six, with C Ava, I, TBringing battery dump energy formula (4) into estimates the power-type lithium ion battery dump energy under the different temperatures environment:
SOC = ( SOC ini - C dis C ava ) * 100 - - - ( 4 )
Wherein, SOCini is initial SOC, and Cdis is discharge capacity, and Cava is active volume.
Effect of the present invention:
The present invention is under condition of different temperatures, at the power-type lithium ion battery, carry out the discharge test under the different multiplying, set up and push over the Peukert equation of considering temperature, thereby estimate the active volume of battery under the different temperatures environment, set up the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment, thereby estimate the battery dump energy under the different temperatures environment.The present invention has realized the power-type lithium ion battery remaining capacity estimation under the different temperatures environment.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
Embodiment
Embodiment one: the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment of present embodiment is realized according to the following steps:
One, with lithium ion battery under T1=35 ℃ temperature conditions, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C1, C 7C1, C 5C1, C 3C1, C 1C1, C 1/3C1
Lithium ion battery under T2=25 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2
Lithium ion battery under T3=10 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3
Lithium ion battery under T4=0 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C4, C 7C4, C 5C4, C 3C4, C 1C4, C 1/3C4
Lithium ion battery under T5=-10 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5
Lithium ion battery under T6=-15 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6
Two, select the 10C multiplying power to be the highest discharge current, the 1/3C multiplying power is minimum discharge current:
With I 10C1, I 1/3C1, C 10C1And C 1/3C1Be computational data, obtaining at the Peukert of T1=35 ℃ of temperature conditions coefficient is k1 and n1;
With I 10C2, I 1/3C2, C 10C2And C 1/3C2Be computational data, obtain at the Peukert of T2=25 ℃ of temperature conditions coefficient k 2 and n2;
With I 10C3, I 1/3C3, C 10C3And C 1/3C3Be computational data, obtain at the Peukert of T3=10 ℃ of temperature conditions coefficient k 3 and n3;
With I 10C4, I 1/3C4, C 10C4And C 1/3C4Be computational data, obtain at the Peukert of T4=0 ℃ of temperature conditions coefficient k 4 and n4;
With I 10C5, I 1/3C5, C 10C5And C 1/3C5Be computational data, obtain at the Peukert of T5=-10 ℃ of temperature conditions coefficient k 5 and n5;
With I 10C6, I 1/3C6, C 10C6And C 1/3C6Be computational data, obtain at the Peukert of T6=-15 ℃ of temperature conditions coefficient k 6 and n6;
Three, with T being transverse axis, is the longitudinal axis with the k axle, to six point (T1, k 1), (T2, k 2), (T3, k 3),
(T4, k 4), (T5, k 5) and (T6, k 6) carry out curve fitting, and use least square method, obtaining with T is independent variable, is the fitting formula of dependent variable with k,
k(T)=a 4T 4+a 3T 3+a 2T 2+a 1T+a 0????(1)
Four, with T being transverse axis, is the longitudinal axis with the n axle, to six point (T1, n 1), (T2, n 2), (T3, n 3), (T4, n 4), (T5, n 5) and (T6, n 6) carry out curve fitting, and use least square method, obtaining with T is independent variable, is the fitting formula of dependent variable with n,
n(T)=b 4T 4+b 3T 3+b 2T 2+b 1T+b 0????(2)
Five, the active volume formula is:
C ava , I , T = k ( T ) I ( 1 - n ( T ) ) = ( a 4 T 4 + a 3 T 3 + a 2 T 2 + a 1 T + a 0 ) * I ( 1 - ( b 4 T 4 + b 3 T 3 + b 2 T 2 + b 1 T + b 0 ) ) , I ⊆ [ I 1 / 3 C A , I 10 C A ] - - - ( 3 )
Six, with C Ava, I, TBringing battery dump energy formula (4) into estimates the power-type lithium ion battery dump energy under the different temperatures environment:
SOC = ( SOC ini - C dis C ava ) * 100 - - - ( 4 )
Wherein, SOCini is initial SOC, and Cdis is discharge capacity, and Cava is active volume.
The present embodiment effect:
Present embodiment is under condition of different temperatures, at the power-type lithium ion battery, carry out the discharge test under the different multiplying, set up and push over the Peukert equation of considering temperature, thereby estimate the active volume of battery under the different temperatures environment, set up the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment, thereby estimate the battery dump energy under the different temperatures environment.Present embodiment has realized the power-type lithium ion battery remaining capacity estimation under the different temperatures environment.
Embodiment two: what present embodiment and embodiment one were different is: in the step 1 with lithium ion battery under T1=35 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power;
Step 2: the lithium ion battery laying temperature is set at T1=35 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C1, C 7C1, C 5C1, C 3C1, C 1C1, C 1/3C1Other step and parameter are identical with embodiment one.
Embodiment three: what present embodiment was different with embodiment one or two is: in the step 1 with lithium ion battery under T2=25 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power;
Step 2: the lithium ion battery laying temperature is set at T2=25 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2Other step parameter is identical with embodiment one or two.
Embodiment four: what present embodiment was different with one of embodiment one to three is: in the step 1 with lithium ion battery under T3=10 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power;
Step 2: the lithium ion battery laying temperature is set at T3=10 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3Other step and parameter are identical with one of embodiment one to four.
Embodiment five: present embodiment is different with one of embodiment one to four be in the step 1 with lithium ion battery under T4=0 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power;
Step 2: the lithium ion battery laying temperature is set at T4=0 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C4, C 7C4,, C 5C4, C 3C4, C 1C4, C 1/3C4Other step and parameter are identical with one of embodiment one to five.
Embodiment six: present embodiment is different with one of embodiment one to five be in the step 1 with lithium ion battery under T5=-10 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power;
Step 2: the lithium ion battery laying temperature is set at T5=-10 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5Other step and parameter are identical with one of embodiment one to five.
Embodiment seven: what present embodiment was different with one of embodiment one to six is: in the step 1 with lithium ion battery under T6=-15 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power;
Step 2: the lithium ion battery laying temperature is set at T6=-15 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6Other step and parameter are identical with one of embodiment one to six.
Embodiment eight: what present embodiment was different with one of embodiment one to seven is: in the step 2 power-type lithium ion battery dump energy under the different temperatures environment is estimated:
SOC = ( SOC ini - C dis C ava , I , T ) * 100 = ( SOC ini - C dis k ( T ) I ( 1 - n ( T ) ) ) * 100 - - - ( 5 )
Wherein,
k(T)=a 4T 4+a 3T 3+a 2T 2+a 1T+a 0????(6)
n(T)=b 4T 4+b 3T 3+b 2T 2+b 1T+b 0????(7)。
Other step and parameter are identical with one of embodiment one to seven.

Claims (8)

1. the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment is characterized in that the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment is realized according to the following steps:
One, with lithium ion battery under T1=35 ℃ temperature conditions, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C1, C 7C1, C 5C1, C 3C1, C 1C1, C 1/3C1
Lithium ion battery under T2=25 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2
Lithium ion battery under T3=10 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3
Lithium ion battery under T4=0 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C4, C 7C4, C 5C4, C 3C4, C 1C4, C 1/3C4
Lithium ion battery under T5=-10 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5
Lithium ion battery under T6=-15 ℃ temperature conditions, is carried out the discharge test of 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6
Two, select the 10C multiplying power to be the highest discharge current, the 1/3C multiplying power is minimum discharge current:
With I 10C1, I 1/3C1, C 10C1And C 1/3C1Be computational data, obtaining at the Peukert of T1=35 ℃ of temperature conditions coefficient is k1 and n1;
With I 10C2, I 1/3C2, C 10c2And C 1/3C2Be computational data, obtain at the Peukert of T2=25 ℃ of temperature conditions coefficient k 2 and n2;
With I 10C3, I 1/3C3, C 10C3And C 1/3C3Be computational data, obtain at the Peukert of T3=10 ℃ of temperature conditions coefficient k 3 and n3;
With I 10C4, I 1/3C4, C 10c4And C 1/3C4Be computational data, obtain at the Peukert of T4=0 ℃ of temperature conditions coefficient k 4 and n4;
With I 10C5, I 1/3C5, C 10c5And C 1/3C5Be computational data, obtain at the Peukert of T5=-10 ℃ of temperature conditions coefficient k 5 and n5;
With I 10C6, I 1/3C6, C 10C6And C 1/3C6Be computational data, obtain at the Peukert of T6=-15 ℃ of temperature conditions coefficient k 6 and n6;
Three, with T being transverse axis, is the longitudinal axis with the k axle, to six point (T1, k 1), (T2, k 2), (T3, k 3), (T4, k 4), (T5, k 5) and (T6, k 6) carry out curve fitting, and use least square method, obtaining with T is independent variable, is the fitting formula of dependent variable with k,
k(T)=a 4T 4+a 3T 3+a 2T 2+a 1T+a 0????(1)
Four, with T being transverse axis, is the longitudinal axis with the n axle, to six point (T1, n 1), (T2, n 2), (T3, n 3), (T4, n 4), (T5, n 5) and (T6, n 6) carry out curve fitting, and use least square method, obtaining with T is independent variable, is the fitting formula of dependent variable with n,
n(T)=b 4T 4+b 3T 3+b 2T 2+b 1T+b 0????(2)
Five, the active volume formula is:
C ava , I , T = k ( T ) I ( 1 - n ( T ) ) = ( a 4 T 4 + a 3 T 3 + a 2 T 2 + a 1 T + a 0 ) * I ( 1 - ( b 4 T 4 + b 3 T 3 + b 2 T 2 + b 1 T + b 0 ) ) , I ⊆ [ I 1 / 3 C A , I 10 C A ] - - - ( 3 )
Six, with C Ava, I, TBringing battery dump energy formula (4) into estimates the power-type lithium ion battery dump energy under the different temperatures environment:
SOC = ( SOC ini - C dis C ava ) * 100 - - - ( 4 )
Wherein, SOCini is initial SOC, and Cdis is discharge capacity, and Cava is active volume.
2. the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment according to claim 1, it is characterized in that: in the step 1 with lithium ion battery under T1=35 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power, to the electric weight full state;
Step 2: the lithium ion battery laying temperature is set at T1=35 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C1, C 7C1,, C 5C1, C 3C1, C 1C1, C 1/3C1
3. the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment according to claim 1, it is characterized in that: in the step 1 with lithium ion battery under T2=25 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power, to the electric weight full state;
Step 2: the lithium ion battery laying temperature is set at T2=25 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2
4. the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment according to claim 1, it is characterized in that: in the step 1 with lithium ion battery under T3=10 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power, to the electric weight full state;
Step 2: the lithium ion battery laying temperature is set at T3=10 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3
5. the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment according to claim 1, it is characterized in that: in the step 1 with lithium ion battery under T4=0 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power, to the electric weight full state;
Step 2: the lithium ion battery laying temperature is set at T4=0 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C4, C 7C4,, C 5C4, C 3C4, C 1C4, C 1/3C4
6. the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment according to claim 1, it is characterized in that: in the step 1 with lithium ion battery under T5=-10 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power, to the electric weight full state;
Step 2: the lithium ion battery laying temperature is set at T5=-10 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5
7. the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment according to claim 1, it is characterized in that: in the step 1 with lithium ion battery under T6=-15 ℃ temperature conditions, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C is specially:
Step 1: under normal temperature condition, lithium ion battery is charged with the 1/3C multiplying power, to the electric weight full state;
Step 2: the lithium ion battery laying temperature is set at T6=-15 ℃ constant temperature oven 12 hours;
Step 3: discharge then, be discharged to cut-off voltage, and record respectively lithium ion battery 10C, 7C, 5C, 3C, 1C and six multiplying powers of 1/3C discharge capacity, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6
8. the power-type lithium ion battery method for estimating remaining capacity under the different temperatures environment according to claim 1 is characterized in that: in the step 2 power-type lithium ion battery dump energy under the different temperatures environment is estimated:
SOC = ( SOC ini - C dis C ava , I , T ) * 100 = ( SOC ini - C dis k ( T ) I ( 1 - n ( T ) ) ) * 100 - - - ( 5 )
Wherein,
k(T)=a 4T 4+a 3T 3+a 2T 2+a 1T+a 0????(6)
n(T)=b 4T 4+b 3T 3+b 2T 2+b 1T+b 0????(7)。
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CN103529400A (en) * 2013-10-29 2014-01-22 哈尔滨工业大学 Battery capacity forecasting method with self-adaptive temperature compensating function
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CN109342955A (en) * 2018-11-19 2019-02-15 台州钱江新能源研究院有限公司 A kind of projectional technique and system of capacity of lithium ion battery

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