CN106646240A - Method for estimating maximum discharge power of lithium battery - Google Patents

Abstract

The invention provides a method for estimating the maximum discharge power of a lithium battery, and the method is used for online estimation of current maximum discharge power of the lithium battery. The method comprises the following steps: S1, estimating the current internal resistance value R1 of the lithium battery; S2, calculating the maximum discharge current I that the lithium battery can actually output currently according to the current internal resistance value R1 of the lithium battery; S3, calculating the current maximum discharge power P of the lithium battery according to the maximum discharge current I that the lithium battery can actually output currently. The method provided by the invention is good in robustness, is higher in precision, is small in calculation amount, is convenient for the adjustment of parameters, and facilitates the engineering implementation.

Description

The evaluation method of lithium battery maximum discharge power

Technical field

The present invention relates to a kind of evaluation method of lithium battery maximum discharge power.

Background technology

The maximum discharge power of lithium battery, it can be estimated that battery power output under different conditions The limit.Therefore, the calculating of the maximum discharge power of lithium battery, for match battery and load, Battery is rationally utilized, extends battery life, it is all significant.

The maximum discharge power of lithium battery can be entered with contrived experiment under off-line state using equipment Row measurement, but be not suitable for the state of online evaluation lithium battery.

In recent years, the estimation on line method of some lithium battery maximum discharge powers is also occurred in that, than Such as a kind of patent application document " power battery pack limit work(of Publication No. CN104298793A The model of rate is counter to push away dynamic algorithm ", the patent application document " lithium of Publication No. CN103675707A Ion battery peak power online evaluation method ", the patent Shen of Publication No. CN103675707A Please file " a kind of peak power Forecasting Methodology of electrokinetic cell " etc..These are maximum to lithium battery The method that the assessment of discharge power is calculated, model is complicated, difficulty of parameter tuning, for mainly by Over-burden for the battery management system of MCU controls, there is very big obstacle on engineering construction.

It is, therefore, desirable to provide a kind of robustness is good, precision is higher, the convenient lithium electricity of parameter adjustment Pond maximum discharge power estimation on line method.

The content of the invention

For this purpose, the invention provides a kind of evaluation method of lithium battery maximum discharge power, is used for The current maximum discharge power of estimation on line lithium battery, comprises the steps：S1. the lithium is estimated The current internal resistance value R of battery₁；S2. the currently practical energy of the lithium battery is calculated according to equation below The maximum discharge current I of enough output：Wherein, U_OCVxIt is the lithium battery in current electricity SOC_xUnder open-circuit voltage values, U_minFor the lithium There are minimum output voltage during electric current, I in the outside of battery_maxSpecified maximum for the lithium battery is defeated Go out electric current；S3. according to the currently practical maximum discharge current I that can be exported of the lithium battery, Calculate the current maximum discharge power P of the lithium battery.

Preferably, calculate the current maximum of the lithium battery according to equation below in step s3 to put Electrical power P：P=U_min×I。

Further, step S1 includes：S1-1. the initial internal resistance of the lithium battery is obtained Value R₀, initial internal resistance value R₀Making a reservation for electricity when recycling first time for the lithium battery Amount SOC₀With predetermined temperature T₀Under internal resistance value；S1-2. according to the electricity that the lithium battery is current SOC_xCalculate the electricity correction factor α to internal resistance value_SOC, according to the current circulation of the lithium battery Access times j calculates the Capacity fading factor alpha to internal resistance value_H, worked as according to the lithium battery Front temperature t calculates the temperature correction coefficient α to internal resistance value_W；S1-3. calculated according to equation below The internal resistance value R of presently described lithium battery₁：R₁=R₀×α_SOC×α_H×α_W。

Preferably, the predetermined electricity SOC₀More than or equal to the first electricity SOC₁, described first Electricity SOC₁Determined according to the following distribution of the lithium battery：When the electricity of the lithium battery it is big In or equal to the first electricity SOC₁When, the variable quantity of its internal resistance value is less than first predetermined value； When the electricity of the lithium battery is less than the first electricity SOC₁When, the variable quantity of its internal resistance value is big In second predetermined value, wherein, the first predetermined value is not more than the second predetermined value.

Further, the electricity correction factor α_SOCCalculated by equation below：

Wherein,Follow in first time for the lithium battery In predetermined temperature T when ring is used₀Lower electricity is the second electricity SOC₂When internal resistance value, described second Electricity SOC₂Less than the first electricity SOC₁。

Further, the Capacity fading factor alpha_HCalculated by equation below：

Wherein, J is the global cycle access times of the lithium battery, R_J/2In predetermined electricity SOC after recycling at the J/2 time for the lithium battery₀And predetermined temperature T₀Under internal resistance value, R_JIn predetermined electricity SOC after recycling at the J time for the lithium battery₀ With predetermined temperature T₀Under internal resistance value.

Further, the temperature correction coefficient α_WCalculated according to the temperature lookup table for prestoring, Wherein, the temperature lookup table includes multiple temperature t1, t2 ..., tN and with the plurality of temperature point Not corresponding temperature correction coefficient α_W1,α_W2,...,α_WN.The plurality of temperature t1, t2 ..., tN includes spy Constant temperature degree tx, its value is equal to the predetermined temperature T₀；Also, it is corresponding with the specified temp tx Temperature correction coefficient α_WxFor 1.

Preferably, the predetermined electricity SOC₀For 50%, the first electricity SOC₁For 30%, The second electricity SOC₂For 10%.

The evaluation method of the lithium battery maximum discharge power of the present invention, it is current by obtaining lithium battery Electricity, recycle number of times and temperature to estimate the maximum discharge power of lithium battery, Its operand is less, and Project Realization is convenient.

Description of the drawings

Fig. 1 is the schematic flow sheet of the evaluation method of the lithium battery maximum discharge power of the present invention；

Fig. 2 is the schematic flow sheet of step S1 in Fig. 1.

Specific embodiment

With reference to the accompanying drawings and detailed description to lithium battery maximum discharge power of the invention Evaluation method is described in further detail, but not as a limitation of the invention.

The invention provides a kind of evaluation method of lithium battery maximum discharge power, for estimating online Calculate the current maximum discharge power of lithium battery.As shown in figure 1, the method includes：

Step S1：

According to the current electricity SOC of lithium battery_x, current recycling number of times j and current Temperature t, estimate the current internal resistance value R of lithium battery₁。

Specifically, step S1 also includes following sub-step：

Sub-step S1-1：

Obtain initial internal resistance value R of lithium battery₀.Initial internal resistance value R₀Refer to, lithium battery is first During secondary recycling, in predetermined electricity SOC₀With predetermined temperature T₀Under internal resistance value.

Initial internal resistance value R₀Can be the internal resistance value of off-line measurement under these conditions, Ran Houbao Deposit in memory, needing the internal resistance value R of estimation on line lithium battery₁When, read from memory Obtain.

One cycle recycles refer to lithium battery for the first time using a charge and discharge process is referred to It is not carry out the new battery that charge and discharge cycles use process.

Predetermined electricity SOC₀Selection need consider lithium battery in the predetermined electricity SOC₀When internal resistance Value must be stable.Due to the internal resistance value of lithium battery it is more stable when electricity is sufficient (when The electricity of lithium battery is more than or equal to the first electricity SOC₁When its internal resistance value variable quantity be less than first Predetermined value), and electricity is less than the first electricity SOC₁When can significantly increase (i.e. when the electricity of lithium battery Less than the first electricity SOC₁When its internal resistance value variable quantity be more than second predetermined value, wherein first is pre- Definite value is not more than second predetermined value), therefore, predetermined electricity SOC₀Need electric more than or equal to first Amount SOC₁。

Jing experiments can be obtained, first electricity SOC₁Preferred value be 30%.Predetermined electricity SOC₀'s Selection is needed more than or equal to 30%, according to the predetermined use state of lithium battery, predetermined electricity SOC₀Preferred value be recommended as 50%.

Predetermined temperature T₀The common temperature of lithium battery is referred to, lithium battery can be selected in normal work When within the temperature range of any one temperature value as predetermined temperature T₀, such as 20 DEG C.

Sub-step S1-2：

According to the current electricity SOC of lithium battery_xCalculate the electricity correction factor α to internal resistance value_SOC, The Capacity fading coefficient to internal resistance value is calculated according to the current recycling number of times j of lithium battery α_H, the temperature correction coefficient α to internal resistance value is calculated according to current temperature t of lithium battery_W。

The current electricity SOC of lithium battery_x, current recycling number of times j and current temperature t Can obtain from the output of the real-time management system of lithium battery.

Electricity correction factor α _SOC Calculating：

Electricity correction factor α_SOCThe current electricity SOC of reaction lithium battery_xShadow to its internal resistance value Ring, i.e., from initial internal resistance value R₀To current internal resistance value R₁Due to the internal resistance value caused by electric quantity change Intensity of variation.

Because the internal resistance value of lithium battery is more than or equal to the first electricity SOC in electricity₁When it is more steady It is fixed, and it is less than the first electricity SOC in electricity₁When can significantly increase, it is therefore preferred that electricity Correction factor α_SOCCan be calculated by equation below 1：

Formula 1

Wherein,For lithium battery first time recycle when in predetermined temperature T₀Lower electricity is Second electricity SOC₂When internal resistance value, the second electricity SOC₂It is less than the first electricity SOC₁One Charge value, preferably second electricity SOC₂For 10%.

Certainly, electricity correction factor α_SOCCan also be calculated using other methods.For example, Jing Germicidal efficacy finds that the internal resistance value of lithium battery is SOC in its electricity₁～SOC₃Between when it is more steady It is fixed, and less than SOC₁Or more than SOC₃When linear or similar linear change, therefore, Alternatively, electricity correction factor α_SOCCan be calculated by equation below 1 '：

Formula 1 '

Wherein：

R_SOClFor lithium battery first time recycle when in predetermined temperature T₀When lower electricity is SOCl Internal resistance value, i.e., with initial internal resistance value R₀Internal resistance when other conditions are identical but electricity is SOCl Value, wherein SOCl meets 0 ＜ SOCl ＜ SOC₁, i.e., less than SOC₁Segmentation in electricity representative Value, its preferred value is 10%；

R_SOChFor lithium battery first time recycle when in predetermined temperature T₀When lower electricity is SOCh Internal resistance value, i.e., with initial internal resistance value R₀Internal resistance when other conditions are identical but electricity is SOCh Value, wherein SOCh meets SOC₃＜ SOCh ＜ 100, i.e., more than SOC₃Segmentation in electricity generation Tabular value, its preferred value is 90%.

In equation 1, electricity correction factor α_SOCIt is divided to two sections to be calculated, wherein big in its electricity In or equal to SOC₁When electricity correction factor α_SOCFor 1, in electricity SOC is less than₁The electricity of Shi Yi tri- SOC₃When internal resistance value correction factor be this section electricity correction factor α_SOC.And in formula 1 ' In, electricity correction factor α_SOCDivide three sections to be calculated, wherein being SOC in its electricity₁～SOC₂It Between when electricity correction factor α_SOCFor 1, electricity is calculated by linear formula when electricity is other values Correction factor α_SOC.Obviously the method for formula 1 is easier than the method for formula 1 ', but formula 1 ' Method is more accurate than the method for formula 1.

Additionally, electricity correction factor α_SOCCan also there are other computational methods, for example, Ke Yitong Cross off-line measurement value and set up look-up table, then electricity is obtained by look-up table in line computation and repaiied Positive coefficient α_SOC。

Capacity fading factor alpha _H Calculating：

Capacity fading factor alpha_HThe current recycling number of times of reaction lithium battery is to its internal resistance value Impact, i.e., from initial internal resistance value R₀To current internal resistance value R₁Due to recycling increasing for number of times The intensity of variation of caused internal resistance value.

Capacity fading factor alpha_HCalculated by equation below 2：

Formula 2

Wherein, J for lithium battery global cycle access times, i.e. the recycling number of times of maximum possible, Namely cycle life；R_J/2For lithium battery the J/2 time recycle when in predetermined electricity SOC₀With Predetermined temperature T₀Under internal resistance value；R_JFor lithium battery the J time recycle when in predetermined electricity SOC₀With predetermined temperature T₀Under internal resistance value.

The method of formula 2 is by Capacity fading factor alpha_HCarry out segmentation calculating, per section of selection One representative value is representing the Capacity fading factor alpha in the segmentation_H.It is understood that The computational methods of formula 2, are simply segmented an example of calculating, and those skilled in the art are in public affairs Other similar computational methods that swap out can also be become under the enlightenment of formula 2.

Additionally, Capacity fading factor alpha_HCan also be calculated by additive method.For example, Capacity fading factor alpha_HCan also be calculated by equation below 2 '：

Formula 2 '

Wherein, R_J0In predetermined electricity SOC after recycling at the J time for lithium battery₀With pre- constant temperature Degree T₀Under internal resistance value.

It is understood that Capacity fading factor alpha_HThere can also be other computational methods, For example, look-up table can be set up by off-line measurement value, look-up table is then passed through in line computation To obtain Capacity fading factor alpha_H。

Temperature correction coefficient α _W Calculating：

Temperature correction coefficient α_WImpact of reaction current temperature t of lithium battery to its internal resistance value, i.e., from Initial internal resistance value R₀To current internal resistance value R₁Due to the change journey of the internal resistance value caused by temperature change Degree.

For lithium battery, temperature correction coefficient is the function of temperature.Look-up table can be used To complete temperature correction coefficient α_WCalculating, i.e., calculate temperature according to the temperature lookup table for prestoring Correction factor α_W.Temperature lookup table includes multiple temperature t1, t2 ..., tN and corresponding with each temperature Temperature correction coefficient α_W1,α_W2,...,α_WN, as shown in table 1：

The temperature lookup table of table 1

Temperature	Temperature correction coefficient
		t1	αW1
t2	αW2
		...	...
tN	αWN

Multiple temperature t1 in temperature lookup table, t2 ..., tN includes specified temp tx, specified temp tx Value be equal to predetermined temperature T₀.Also, temperature correction coefficient α corresponding with specified temp tx_WxFor 1.Lithium battery can be carried out off-line measurement and be obtained by temperature lookup table.

Temperature adjustmemt system is calculated according to current temperature t of lithium battery and the temperature lookup table for prestoring Number α_WMethod it is as follows：

If the value of current temperature t of lithium battery is included in the multiple temperature in temperature lookup table In t1, t2 ..., tN, then the corresponding temperature correction coefficient α of temperature t current with lithium battery is directly read_W .

If the value of current temperature t of lithium battery is not included in the multiple temperature in temperature lookup table In t1, t2 ..., tN, then there are various methods to can determine corresponding temperature correction coefficient α_W.With Under enumerate two methods, respectively adjacent to method and linear approach.

1) neighbouring method：

Immediate temperature tn of value of temperature t current with lithium battery in temperature lookup table is found, then Read the temperature correction coefficient α corresponding to immediate temperature tn_WnFor the current temperature of lithium battery The temperature correction coefficient α of t_W。

2) linear approach：

By immediate two temperature of the value of temperature t current with lithium battery in temperature lookup table Tn1, tn2 and two corresponding temperature correction coefficient α_Wn1,α_Wn2Carry out linear fit, obtain with The corresponding temperature correction coefficient α of current temperature t of lithium battery_WtFor temperature correction coefficient α_W, i.e.,

More than, by sub-step S1-2, complete electricity correction factor α_SOC, circulation volume declines Subtract factor alpha_HAnd temperature correction coefficient α_WCalculating.

Sub-step S1-3：

The internal resistance value R of presently described lithium battery is calculated according to equation below 3₁：

R₁=R₀×α_SOC×α_H×α_WFormula 3

It will be appreciated by persons skilled in the art that above-mentioned sub-step S1-2 and S1-3 can merge, That is, it is not first to calculate each correction factor to calculate final internal resistance value again, but directly calculates and repair Internal resistance value after just.For example, first according to the current electricity SOC of lithium battery_xAfter calculating electricity amendment Internal resistance value R'=R₀×α_SOC, further according to the current recycling number of times j of lithium battery calculate electricity and The revised internal resistance value R of cycle-index "=R' × α_H, finally according to the current temperature t meter of lithium battery Calculate the current internal resistance value R of lithium battery₁=R " × α_W.It can also be appreciated that in aforementioned calculating Sequencing can be converted, however it is not limited to the listed this computation sequence enumerated.

More than, by step 1, complete the internal resistance value R current to lithium battery₁Estimation.

Step S2：

According to the current internal resistance value R of lithium battery₁, working as lithium battery is calculated according to equation below 4 The front maximum discharge current I that actually can be exported：

Formula 4

Wherein,U_OCVxIt is lithium battery in current electricity SOC_xUnder open circuit Magnitude of voltage, i.e. lithium battery are currently able to the highest magnitude of voltage for providing, and can pass through off-line measurement And obtain；U_minMinimum output voltage when having an electric current for the outside of lithium battery, in correspondence lithium battery Resistance has the output voltage of electric current when minimum；I_maxIt is for the specified maximum output current of lithium battery, i.e., defeated Go out the higher limit of electric current permission.

Step S3：

According to the currently practical maximum discharge current I that can be exported of lithium battery, according to equation below The 5 maximum discharge power Ps current to calculate lithium battery：

P=U_min× I formula 5

There is the output voltage U of electric current when minimum with lithium battery internal resistance_minWith it is currently practical can The product of the maximum discharge current I of the output maximum discharge power P current to calculate lithium battery.

Illustrate the lithium battery internal resistance evaluation method of the present invention with an example below.

Certain type needs the lithium battery of its internal resistance value of estimation on line, its current electricity SOC_xFor 20%, Current temperature t is 40 DEG C.

Sub-step S1-1：

It is obtained in 20 DEG C of (predetermined temperature T₀) under 50% electricity (predetermined electricity SOC₀) stylish The internal resistance value of battery (recycling for the first time) is 5.56m Ω (initial internal resistance values R₀), i.e., initially Internal resistance value R₀=5.56m Ω.

Sub-step S1-2：

The type lithium battery is obtained in 20 DEG C of (predetermined temperature T₀) under 10% electricity (the second electricity SOC₂) Down the internal resistance value of new battery is 11.76m Ω

Electricity correction factor α is calculated by equation below 6_SOC：

Formula 6

The cycle life of the type lithium battery be 1000 times (J), 1000 times circulation after 50% electricity (predetermined electricity SOC₀) and 20 DEG C of (predetermined temperature T₀) under lithium battery internal resistance value be 14.53m Ω (R_J), current recycling number of times is 800 times (j), then according to equation below 7 calculating Capacity fading factor alpha_H。

Formula 7

The temperature lookup table of the type lithium battery is as shown in table 2：

The temperature lookup table example of table 2

Temperature	Temperature correction coefficient
		40℃	0.81
20℃	1.00
		10℃	1.53
0℃	3.48

Then obtain the temperature correction coefficient α of lithium battery by tabling look-up_W=0.81.

Sub-step S1-3：

The current internal resistance value R of lithium battery is calculated according to equation below 8₁：

R₁=R₀×α_SOC×α_H×α_W=24.92m Ω formula 8

Step S2：

Lithium battery is in 20 DEG C of (predetermined temperature T₀) under 20% electricity (current electricity SOC_x) under Open-circuit voltage is 3.6V (U_OCVx), there is minimum output voltage during electric current to be 3.0V outside it (U_min), specified maximum output current is 50A (I_max).Lithium battery is calculated according to formula 9 The currently practical maximum discharge current I that can be exported：

Formula 9

Step S3：

The current maximum discharge power P of lithium battery is calculated according to formula 10：

P=U_min× I=72.3W formula 10

The evaluation method of the lithium battery maximum discharge power of the present invention, it is adaptable to the maximum of lithium battery The estimation on line of discharge power, its pass through read lithium battery electricity, recycle number of times and Temperature estimating the internal resistance value of lithium battery, then according to the dynamic internal resistance value calculating maximum electric discharge Electric current and maximum discharge power.Its advantage is：

1) estimation on line can be carried out without the need for additional any detection device, lithium battery group can be reduced Complexity；

2) detected value of the current voltage and current of lithium battery, estimation result reliability are not relied on. Because the measured value fluctuation of the online voltage and current of lithium battery is very big, often there is saltus step in Jing, because This also can undergo mutation according to the internal resistance value of the voltage and current value of on-line measurement estimation.And this The evaluation method of bright lithium battery maximum discharge power, when internal resistance estimation is carried out, without employing The electric current and magnitude of voltage of on-line measurement, it is to avoid because measured value is forbidden the evaluated error that causes；

3) evaluation method of lithium battery of the invention maximum discharge power, its method is easy, calculates Amount is less, is easy to Project Realization.

Above specific embodiment is only the illustrative embodiments of the present invention, it is impossible to for limiting The present invention, protection scope of the present invention is defined by the claims.Those skilled in the art can be with In the essence and protection domain of the present invention, various modifications or equivalent are made to the present invention, These modifications or equivalent also should be regarded as being within the scope of the present invention.

Claims (10)

1. a kind of evaluation method of lithium battery maximum discharge power, works as estimation on line lithium battery Front maximum discharge power, it is characterised in that comprise the steps：

S1. the current internal resistance value R of the lithium battery is estimated₁；

S2. the currently practical maximum that can be exported for calculating the lithium battery according to equation below is put Electric current I：

$I=\left\{\begin{array}{cc}{I}_m& (I_m<I_{max})\\ I_{max}& (I_m\&GreaterEqual;I_{max})\end{array}\right.,$

Wherein,U_OCVxIt is the lithium battery in current electricity SOC_xUnder Open-circuit voltage values, U_minMinimum output voltage when having an electric current for the outside of the lithium battery, I_maxFor The specified maximum output current of the lithium battery；

S3. according to the described currently practical maximum discharge current I that can be exported of the lithium battery, Calculate the current maximum discharge power P of the lithium battery.

2. lithium battery internal resistance value evaluation method according to claim 1, it is characterised in that In step s3 the current maximum discharge power P of the lithium battery is calculated according to equation below：

P=U_min×I。

3. the evaluation method of lithium battery according to claim 1 maximum discharge power, it is special Levy and be, step S1 includes：

S1-1. initial internal resistance value R of the lithium battery is obtained₀, initial internal resistance value R₀For described Lithium battery is when recycling in predetermined electricity SOC first time₀With predetermined temperature T₀Under internal resistance Value；

S1-2. according to the electricity SOC that the lithium battery is current_xCalculate the electricity amendment to internal resistance value Factor alpha_SOC, the circulation to internal resistance value is calculated according to the current recycling number of times j of the lithium battery Capacity attenuation factor alpha_H, the temperature to internal resistance value is calculated according to current temperature t of the lithium battery and is repaiied Positive coefficient α_W；

S1-3. the internal resistance value R of presently described lithium battery is calculated according to equation below₁：

R₁=R₀×α_SOC×α_H×α_W。

4. the evaluation method of lithium battery according to claim 3 maximum discharge power, it is special Levy and be, the predetermined electricity SOC₀More than or equal to the first electricity SOC₁, first electricity SOC₁Determined according to the following distribution of the lithium battery：When the lithium battery electricity be more than or Equal to the first electricity SOC₁When, the variable quantity of its internal resistance value is less than first predetermined value；Work as institute The electricity for stating lithium battery is less than the first electricity SOC₁When, the variable quantity of its internal resistance value is more than the Two predetermined values, wherein, the first predetermined value is not more than the second predetermined value.

5. the evaluation method of lithium battery according to claim 4 maximum discharge power, it is special Levy and be, the electricity correction factor α_SOCCalculated by equation below：

${\mathrm{\&alpha;}}_{SOC}=\left\{\begin{array}{cc}\frac{R_{{\mathrm{SOC}}_2}}{R_0}& ({\mathrm{SOC}}_x<{\mathrm{SOC}}_1)\\ 1& ({\mathrm{SOC}}_x\&GreaterEqual;{\mathrm{SOC}}_1)\end{array}\right.,$ Wherein,

For the lithium battery first time recycle when in predetermined temperature T₀Lower electricity is the Two electricity SOC₂When internal resistance value, the second electricity SOC₂Less than the first electricity SOC₁。

6. the evaluation method of lithium battery according to claim 3 maximum discharge power, it is special Levy and be, the Capacity fading factor alpha_HCalculated by equation below：

${\mathrm{\&alpha;}}_H=\left\{\begin{array}{cc}1& (j<\frac{J}{3})\\ \frac{R_{J/2}}{R_0}& (\frac{J}{3}\&le;j\&le;\frac{2J}{3})\\ \frac{R_J}{R_0}& (j<\frac{2J}{3})\end{array}\right.,$ Wherein,

J is the global cycle access times of the lithium battery, R_J/2It is the lithium battery at the J/2 time In predetermined electricity SOC after recycling₀With predetermined temperature T₀Under internal resistance value, R_JFor lithium electricity Pond is after the J time recycling in predetermined electricity SOC₀With predetermined temperature T₀Under internal resistance value.

7. lithium battery internal resistance value evaluation method according to claim 3, it is characterised in that The temperature correction coefficient α_WCalculated according to the temperature lookup table for prestoring, wherein, the temperature Look-up table include multiple temperature t1, t2 ..., tN and with the plurality of temperature corresponding temperature adjustmemt of difference Factor alpha_W1,α_W2,...,α_WN。

8. lithium battery internal resistance value evaluation method according to claim 7, it is characterised in that The plurality of temperature t1, t2 ..., tN include specified temp tx, and its value is equal to the predetermined temperature T₀； Also, temperature correction coefficient α corresponding with the specified temp tx_WxFor 1.

9. the evaluation method of lithium battery according to claim 3 maximum discharge power, it is special Levy and be, the predetermined electricity SOC₀For 50%.

10. the evaluation method of lithium battery according to claim 5 maximum discharge power, its It is characterised by, the first electricity SOC₁For 30%, the second electricity SOC₂For 10%.