CN103278760B - Power-type lithium ion battery method for estimating remaining capacity under different temperatures environment - Google Patents

Power-type lithium ion battery method for estimating remaining capacity under different temperatures environment Download PDF

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CN103278760B
CN103278760B CN201310177941.8A CN201310177941A CN103278760B CN 103278760 B CN103278760 B CN 103278760B CN 201310177941 A CN201310177941 A CN 201310177941A CN 103278760 B CN103278760 B CN 103278760B
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lithium ion
ion battery
power
discharge
multiplying powers
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CN103278760A (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

Power-type lithium ion battery method for estimating remaining capacity under different temperatures environment, the present invention relates to power-type lithium ion battery remaining capacity estimation field.The present invention will solve existing estimation method of battery dump energy not consider the problem of temperature on the impact of battery dump energy.One, lithium ion battery is under six temperature conditions, carries out the discharge test of six multiplying powers; Two, select 10C multiplying power to be the highest discharge current, 1/3C multiplying power is minimum discharge current, obtains Peukert COEFFICIENT K and the n of six temperature conditions; Three, carry out curve fitting to 6, obtaining with T is independent variable, take k as the fitting formula of dependent variable; Four, carry out curve fitting to 6, obtaining with T is independent variable, take n as the fitting formula of dependent variable; Five, active volume formula; Six, by C ava, I, Tbring battery dump energy formula (4) into estimate the power-type lithium ion battery dump energy under different temperatures environment.The present invention is applied to battery dump energy and estimates field.

Description

Power-type lithium ion battery method for estimating remaining capacity under different temperatures environment
Technical field
The present invention relates to power-type lithium ion battery remaining capacity estimation field.
Background technology
The application under normal temperature condition is mainly considered in the research of battery dump energy, less to the battery dump energy Estimation Study under different temperatures environment.Traditional Peukert equation is a kind of method estimating battery dump energy, but does not also take into full account that temperature affects.
The estimation of battery active volume, most methods well known is the Peukert equation that Peukert in 1897 proposes, and equation that describes the relation of battery active volume and discharge current, and obtains and accept more widely, and this formula is:
C ava,I=K*I (1-n)
Wherein, K and n is constant, is called Peukert COEFFICIENT K and n.
But this formula does not consider the effect of temperature in active volume is estimated.
Documents 1 (Ni-MH battery method for estimating remaining capacity research used for electric vehicle, Wu Guoliang, China Ph.D. Dissertation full-text database engineering science and technology II volume, 08th phase in 2011, C035-8 page, on 08 15th, 2011), but the quadratic function matching of the Peukert equation coefficient of Ni-MH battery is accurately low, fails truly to reflect SOC numerical value.
Summary of the invention
The present invention is that the quadratic function matching of the Peukert equation coefficient that will solve Ni-MH battery in existing estimation method of battery dump energy is accurately low, fail truly to reflect the problem of SOC numerical value, and provide the power-type lithium ion battery method for estimating remaining capacity under different temperatures environment.
Power-type lithium ion battery method for estimating remaining capacity under different temperatures environment realizes according to the following steps:
One, by lithium ion battery under the temperature conditions of T1=35 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C1, C 7C1, C 5C1, C 3C1, C 1C1, C 1/3C1;
By lithium ion battery under the temperature conditions of T2=25 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2;
By lithium ion battery under the temperature conditions of T3=10 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3;
By lithium ion battery under the temperature conditions of T4=0 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C4, C 7C4, C 5C4, C 3C4, C 1C4, C 1/3C4;
By lithium ion battery under the temperature conditions of T5=-10 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5;
By lithium ion battery under the temperature conditions of T6=-15 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6;
Two, select 10C multiplying power to be the highest discharge current, 1/3C multiplying power is minimum discharge current:
With I 10C1, I 1/3C1, C 10C1and C 1/3C1for calculating data, obtaining at the Peukert coefficient of T1=35 DEG C of temperature conditions is k1 and n1;
With I 10C2, I 1/3C2, C 10C2and C 1/3C2for calculating data, obtain at the Peukert coefficient k 2 of T2=25 DEG C of temperature conditions and n2;
With I 10C3, I 1/3C3, C 10C3and C 1/3C3for calculating data, obtain at the Peukert coefficient k 3 of T3=10 DEG C of temperature conditions and n3;
With I 10C4, I 1/3C4, C 10C4and C 1/3C4for calculating data, obtain at the Peukert coefficient k 4 of T4=0 DEG C of temperature conditions and n4;
With I 10C5, I 1/3C5, C 10C5and C 1/3C5for calculating data, obtain at the Peukert coefficient k 5 of T5=-10 DEG C of temperature conditions and n5;
With I 10C6, I 1/3C6, C 10C6and C 1/3C6for calculating data, obtain at the Peukert coefficient k 6 of T6=-15 DEG C of temperature conditions and n6;
Three, take T as transverse axis, with k axle for the longitudinal axis, 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, take k as the fitting formula of dependent variable,
k(T)=a 4T 4+a 3T 3+a 2T 2+a 1T+a 0(1)
Four, take T as transverse axis, with n axle for the longitudinal axis, 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, take n as the fitting formula of dependent variable,
n(T)=b 4T 4+b 3T 3+b 2T 2+b 1T+b 0(2)
Five, 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, by C ava, I, Tbring battery dump energy formula (4) into estimate the power-type lithium ion battery dump energy under different temperatures environment:
SOC = ( SOC ini - C dis C ava ) * 100 - - - ( 4 )
Wherein, SOCini is initial SOC, Cdis is discharge capacity, and Cava is active volume.
Effect of the present invention:
The present invention is under condition of different temperatures, for power-type lithium ion battery, carry out the discharge test under different multiplying, set up and push over the Peukert equation considering temperature, thus the active volume of battery under estimating different temperatures environment, set up the power-type lithium ion battery method for estimating remaining capacity under different temperatures environment, thus estimate the battery dump energy under different temperatures environment.Present invention achieves the power-type lithium ion battery remaining capacity estimation under different temperatures environment.
Accompanying drawing explanation
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 realizes according to the following steps:
One, by lithium ion battery under the temperature conditions of T1=35 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C1, C 7C1, C 5C1, C 3C1, C 1C1, C 1/3C1;
By lithium ion battery under the temperature conditions of T2=25 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2;
By lithium ion battery under the temperature conditions of T3=10 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3;
By lithium ion battery under the temperature conditions of T4=0 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C4, C 7C4, C 5C4, C 3C4, C 1C4, C 1/3C4;
By lithium ion battery under the temperature conditions of T5=-10 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5;
By lithium ion battery under the temperature conditions of T6=-15 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6;
Two, select 10C multiplying power to be the highest discharge current, 1/3C multiplying power is minimum discharge current:
With I 10C1, I 1/3C1, C 10C1and C 1/3C1for calculating data, obtaining at the Peukert coefficient of T1=35 DEG C of temperature conditions is k1 and n1;
With I 10C2, I 1/3C2, C 10C2and C 1/3C2for calculating data, obtain at the Peukert coefficient k 2 of T2=25 DEG C of temperature conditions and n2;
With I 10C3, I 1/3C3, C 10C3and C 1/3C3for calculating data, obtain at the Peukert coefficient k 3 of T3=10 DEG C of temperature conditions and n3;
With I 10C4, I 1/3C4, C 10C4and C 1/3C4for calculating data, obtain at the Peukert coefficient k 4 of T4=0 DEG C of temperature conditions and n4;
With I 10C5, I 1/3C5, C 10C5and C 1/3C5for calculating data, obtain at the Peukert coefficient k 5 of T5=-10 DEG C of temperature conditions and n5;
With I 10C6, I 1/3C6, C 10C6and C 1/3C6for calculating data, obtain at the Peukert coefficient k 6 of T6=-15 DEG C of temperature conditions and n6;
Three, take T as transverse axis, with k axle for the longitudinal axis, 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, take k as the fitting formula of dependent variable,
k(T)=a 4T 4+a 3T 3+a 2T 2+a 1T+a 0(1)
Four, take T as transverse axis, with n axle for the longitudinal axis, 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, take n as the fitting formula of dependent variable,
n(T)=b 4T 4+b 3T 3+b 2T 2+b 1T+b 0(2)
Five, 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, by C ava, I, Tbring battery dump energy formula (4) into remain the power-type lithium ion battery under different temperatures environment
Remaining electricity is estimated:
SOC = ( SOC ini - C dis C ava ) * 100 - - - ( 4 )
Wherein, SOCini is initial SOC, Cdis is discharge capacity, and Cava is active volume.
Present embodiment effect:
Present embodiment is under condition of different temperatures, for power-type lithium ion battery, carry out the discharge test under different multiplying, set up and push over the Peukert equation considering temperature, thus the active volume of battery under estimating different temperatures environment, set up the power-type lithium ion battery method for estimating remaining capacity under different temperatures environment, thus estimate the battery dump energy under different temperatures environment.Present embodiment achieves the power-type lithium ion battery remaining capacity estimation under different temperatures environment.
Embodiment two: present embodiment and embodiment one unlike: in step one by lithium ion battery under the temperature conditions of T1=35 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T1=35 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C1, C 7C1, C 5C1, C 3C1, C 1C1, C 1/3C1.Other step and parameter identical with embodiment one.
Embodiment three: present embodiment and embodiment one or two unlike: in step one by lithium ion battery under the temperature conditions of T2=25 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T2=25 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2.Other step parameter is identical with embodiment one or two.
Embodiment four: one of present embodiment and embodiment one to three unlike: in step one by lithium ion battery under the temperature conditions of T3=10 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T3=10 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3.Other step and parameter identical with one of embodiment one to four.
Embodiment five: one of present embodiment and embodiment one to four unlike in step one by lithium ion battery under the temperature conditions of T4=0 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T4=0 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C4, C 7C4, C 5C4, C 3C4, C 1C4, C 1/3C4.Other step and parameter identical with one of embodiment one to five.
Embodiment six: one of present embodiment and embodiment one to five unlike in step one by lithium ion battery under the temperature conditions of T5=-10 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T5=-10 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5.Other step and parameter identical with one of embodiment one to five.
Embodiment seven: one of present embodiment and embodiment one to six unlike: in step one by lithium ion battery under the temperature conditions of T6=-15 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T6=-15 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers discharge capacity, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6.Other step and parameter identical with one of embodiment one to six.
Embodiment eight: one of present embodiment and embodiment one to seven unlike: in step 2, the power-type lithium ion battery dump energy under different temperatures environment is estimated:
SOC = ( SOC ini - C dis C ava ) * 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 identical with one of embodiment one to seven.

Claims (8)

1. the power-type lithium ion battery method for estimating remaining capacity under different temperatures environment, is characterized in that the power-type lithium ion battery method for estimating remaining capacity under different temperatures environment realizes according to the following steps:
One, by lithium ion battery under the temperature conditions of T1=35 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain the discharge capacity of lithium ion battery in 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, be designated as C respectively 10C1, C 7C1, C 5C1, C 3C1, C 1C1, C 1/3C1;
By lithium ion battery under the temperature conditions of T2=25 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain the discharge capacity of lithium ion battery in 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, be designated as C respectively 10C2, C 7C2, C 5C2, C 3C2, C 1C2, C 1/3C2;
By lithium ion battery under the temperature conditions of T3=10 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain the discharge capacity of lithium ion battery in 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, be designated as C respectively 10C3, C 7C3, C 5C3, C 3C3, C 1C3, C 1/3C3;
By lithium ion battery under the temperature conditions of T4=0 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain the discharge capacity of lithium ion battery in 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, be designated as C respectively 10C4, C 7C4, C 5C4, C 3C4, C 1C4, C 1/3C4;
By lithium ion battery under the temperature conditions of T5=-10 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain the discharge capacity of lithium ion battery in 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, be designated as C respectively 10C5, C 7C5, C 5C5, C 3C5, C 1C5, C 1/3C5;
By lithium ion battery under the temperature conditions of T6=-15 DEG C, carry out the discharge test of 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, obtain the discharge capacity of lithium ion battery in 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers, be designated as C respectively 10C6, C 7C6, C 5C6, C 3C6, C 1C6, C 1/3C6;
Two, select 10C multiplying power to be the highest discharge current, 1/3C multiplying power is minimum discharge current:
With I 10C1, I 1/3C1, C 10C1and C 1/3C1for calculating data, obtaining at the Peukert coefficient of T1=35 DEG C of temperature conditions is k1 and n1;
With I 10C2, I 1/3C2, C 10C2and C 1/3C2for calculating data, obtain at the Peukert coefficient k 2 of T2=25 DEG C of temperature conditions and n2;
With I 10C3, I 1/3C3, C 10C3and C 1/3C3for calculating data, obtain at the Peukert coefficient k 3 of T3=10 DEG C of temperature conditions and n3;
With I 10C4, I 1/3C4, C 10C4and C 1/3C4for calculating data, obtain at the Peukert coefficient k 4 of T4=0 DEG C of temperature conditions and n4;
With I 10C5, I 1/3C5, C 10C5and C 1/3C5for calculating data, obtain at the Peukert coefficient k 5 of T5=-10 DEG C of temperature conditions and n5;
With I 10C6, I 1/3C6, C 10C6and C 1/3C6for calculating data, obtain at the Peukert coefficient k 6 of T6=-15 DEG C of temperature conditions and n6;
Three, take T as transverse axis, with k axle for the longitudinal axis, 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, take k as the fitting formula of dependent variable,
k(T)=a 4T 4+a 3T 3+a 2T 2+a 1T+a 0(1)
Four, take T as transverse axis, with n axle for the longitudinal axis, 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, take n as the fitting formula of dependent variable,
n(T)=b 4T 4+b 3T 3+b 2T 2+b 1T+b 0(2)
Five, active volume formula is:
C a v a 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, by C ava, I, Tbring battery dump energy formula (4) into estimate the power-type lithium ion battery dump energy under different temperatures environment:
S O C = ( SOC i n i - C d i s C a v a ) * 100 - - - ( 4 )
Wherein, SOC inifor initial SOC, C disfor discharge capacity, C avafor active volume.
2. the power-type lithium ion battery method for estimating remaining capacity under different temperatures environment according to claim 1, it is characterized in that: in step one by lithium ion battery under the temperature conditions of T1=35 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery, to electricity full state;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T1=35 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers 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 different temperatures environment according to claim 1, it is characterized in that: in step one by lithium ion battery under the temperature conditions of T2=25 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery, to electricity full state;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T2=25 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers 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 different temperatures environment according to claim 1, it is characterized in that: in step one by lithium ion battery under the temperature conditions of T3=10 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery, to electricity full state;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T3=10 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers 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 different temperatures environment according to claim 1, it is characterized in that: in step one by lithium ion battery under the temperature conditions of T4=0 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery, to electricity full state;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T4=0 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers 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 different temperatures environment according to claim 1, it is characterized in that: in step one by lithium ion battery under the temperature conditions of T5=-10 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery, to electricity full state;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T5=-10 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers 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 different temperatures environment according to claim 1, it is characterized in that: in step one by lithium ion battery under the temperature conditions of T6=-15 DEG C, the discharge test of carrying out 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers is specially:
Step 1: under normal temperature condition, charges with 1/3C multiplying power to lithium ion battery, to electricity full state;
Step 2: the constant temperature oven 12 hours lithium ion battery laying temperature being set as T6=-15 DEG C;
Step 3: then discharge, is discharged to cut-off voltage, and respectively record lithium ion battery 10C, 7C, 5C, 3C, 1C and 1/3C six multiplying powers 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 different temperatures environment according to claim 1, is characterized in that: estimate the power-type lithium ion battery dump energy under different temperatures environment in step 2:
S O C = ( SOC i n i - C d i s C a v a , I , T ) * 100 = ( SOC i n i - C d i s k ( T ) I ( 1 - n ( T ) ) ) * 100 - - - ( 5 ) .
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