CN109725263A - Estimation method for high-power charging and discharging heating power of battery - Google Patents
Estimation method for high-power charging and discharging heating power of battery Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 14
- 238000007599 discharging Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 title abstract description 23
- 230000005611 electricity Effects 0.000 claims description 7
- 238000011156 evaluation Methods 0.000 claims description 6
- 240000002853 Nelumbo nucifera Species 0.000 claims 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 1
- 238000013461 design Methods 0.000 description 7
- 230000020169 heat generation Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000007086 side reaction Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Abstract
The invention discloses a method for estimating high-power charging and discharging heating power of a battery, which comprises the following steps: the battery is fully charged at a certain temperature T with a current below a minimum current, and then is discharged at a current below the minimum current to obtain the capacity C0(ii) a The battery is fully charged with a current below a minimum current, and is discharged to a charge state n% with a current below the minimum current; discharging with a current below a minimum current to discharge m% C0Capacity of (d), calculating discharge energy E by integrationn‑m@0.01(ii) a At the same temperature T, the battery is fully charged with a current below a minimum current, and is discharged to a charge state n% with a current below the minimum current; liberation of m% C at high rate pC0Capacity of (d), calculating discharge energy E by integrationn‑m@pDischarge time of tn‑m@p(ii) a Then tn‑m@pThe average thermal power consumption for intra-pC discharge is calculated by: wn‑m@m＝(En‑m@0.01‑En‑m@p)/tn‑m@p。
Description
Technical field
The invention belongs to technical field of chemical power more particularly to a kind of estimations of battery high power charge and discharge heating power
Method.
Background technique
Demand with electric tool, electric car and military special type load to high-power electric energy source is increasingly urgent to, electricity
The power provided needed for pond is also higher and higher.Battery is during discharge often along with biggish warm in high power applications
Effect.The fuel factor of battery is related to material system and battery design, and battery is in charge and discharge process, and there are heat absorption and heat release are existing
As the accumulation of heat will seriously affect the life performance of battery.Under extreme case, if battery occurs thermal runaway and will cause
Serious safety problem.
In order to avoid this kind of situation, the heat transfer that reasonable thermal design generates battery to system can be passed through
It is external, it is therefore necessary to complete thermal design is carried out to battery.
The heat generation rate of battery during discharge is a necessary parameter in thermal design.Its accuracy will directly affect electricity
The reasonability of pond thermal design.
In terms of obtaining battery-heating rate, currently known technology is that battery is in adiabatic environment to carry out charge and discharge,
The temperature change for measuring battery simultaneously calculates the calorific value of battery according to temperature change and the thermal capacitance of battery, to obtain battery
Heat generation rate.It should be pointed out that this method measured is average heat generation rate of the battery within one section of discharge time in fact,
Rather than the instantaneous generation rate at a certain moment.The heat generation rate that this method obtains has one for low range continuous discharge situation
Fixed accuracy.But for the case where to high-multiplying power discharge, especially high-rate pulse discharge, the result of this method test is past
It is larger toward deviation.This is because the transmitting due to heat needs the regular hour, in high-multiplying power discharge, especially put in pulse
When electric, because discharge time is shorter, system temperature is also not up to stable state, and discharge process is just over, therefore, obtains at this time
The temperature of battery is unable to the calorific value in accurate characterization battery discharge procedure.In addition, often positive and negative polarity wire in high-multiplying power discharge
Self-heating amount and thermal capacitance are all larger, and conducting wire can take away quite a few heat, and system leakage heat is more serious.Based on these originals
Cause, this method are not suitable for the measurement of heating power under the battery high power discharge especially operating condition of high power pulse electric discharge.
To solve the problems, such as that battery heat generation rate measurement inaccuracy, present invention in high-multiplying power discharge propose one in well-known technique
Kind is directed to the evaluation method of battery heat generation rate in high-multiplying power discharge.Based on same principle, this method can also be to battery height
Heating power when multiplying power charges measures.
Summary of the invention
In view of the drawbacks of the prior art, the present invention provides a kind of evaluation method of battery high power charge and discharge heating power.
It is of the present invention the specific technical proposal is:
The goal of the invention of this patent is to provide a kind of evaluation method of battery high power charge and discharge heating power, at least wraps
It includes:
Battery is fully charged with the following electric current of minimum electric current (containing minimum electric current) at a certain temperature T, then with minimum electricity
It flows following electric current (containing minimum electric current) and is discharged to final voltage；The discharge capacity of the battery obtained at this time is considered as the whole of battery and holds
Measure C0；The discharge energy of the battery obtained at this time is considered as whole ENERGY Es of battery0；
At same temperature T, battery is fully charged using the following electric current of minimum electric current (containing minimum electric current), is in battery
100% charging state, then discharged with the following electric current of minimum electric current (containing minimum electric current) battery, being discharged to charging state is n%；
Then it is discharged with the following electric current of minimum electric current (containing minimum electric current) battery, releases m%C0Capacity, be denoted as Cn-m@0.01,
Simultaneously by integral way calculate battery this electric discharge releasing energy be denoted as En-m@0.01；
At same temperature T, battery is fully charged using minimum electric current (containing minimum electric current), so that battery is in 100% charged
State, then discharged with minimum electric current (containing minimum electric current) battery, being discharged to charging state is n%；Then with pC pairs of high magnification
Battery discharge, equally releasing m%C0Capacity, be denoted as Cn-m@p, while this electric discharge releasing of battery is calculated by integral way
Energy be denoted as En-m@p, this time used of discharging is denoted as tn-m@p；
Then this tn-m@pAverage heat power consumption when battery is discharged in period with pC, which can be calculate by the following formula, to be obtained:
Wn-m@m=(En-m@0.01-En-m@p)/tn-m@p...............(1)
In above formula:
Wn-m@m: the evenly heat under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, during electric discharge
Power consumption；
En-m@0.01: under temperature T, when battery is in n% charging state, with the following electric current of minimum electric current (containing minimum electric current) electric discharge
M% capacity, the energy of releasing；
En-m@p: under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, the energy released；
tn-m@p: under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, discharge time.
Further, the minimum electric current is 0.01C.
Advantages of the present invention and good effect are as follows:
By using above-mentioned technical proposal, the present invention is had the following technical effect that:
1. can be obtained at a temperature of certain in certain time period when certain current discharge by the flexible use to the above method
The average heat power consumption of battery can also approximatively obtain the instantaneous of battery when the certain time period time very in short-term (i.e. when m very little)
Heat power consumption.
2. heat power consumption-current curve at certain temperature and charging state, certain temperature, electric current can be obtained by the above method
Under heat power consumption-charging state curve, heat power consumption-temperature curve under certain electric current, charging state.It can in actual thermal design work
Quickly to be estimated according to these curves heat power consumption of the battery of a certain particular design under a certain operating condition.
3. being based on same principle, heating power when this method can also charge to battery high power is measured.
Detailed description of the invention
Fig. 1 is the homologous thread of heat power consumption and discharge current in the preferred embodiment of the present invention；
Fig. 2 is that the present invention selects each current value and corresponding heat power consumption in embodiment to take logarithm and map；
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and cooperate attached drawing
Detailed description are as follows.
Technical solution of the present invention is explained in detail with reference to the accompanying drawing.
The technical solution used in the present invention is based on following analysis:
Secondary cell electric energy in the charging process of each charge and discharge cycles is stored in inside battery in the form of chemical energy,
Chemical energy is converted into electric energy in discharge process, with the form release externally done work.Under normal circumstances, this process is filled in low current
It is high reversible when electric discharge, the reduction for only having very little than being filled with energy of externally doing work.Inside battery polarizes very under minimum electric current
Small, electric current is by inside battery flow-guiding structure bring ohm fuel factor also very little, therefore battery externally does work in discharge process
Energy loss it is considered that being only such as the shape of the decomposition of electrolyte, SEI film as caused by the side reaction of inside battery
At etc..This kind of side reaction is often reduction irreversible and along with battery capacity.Therefore the amount of side reaction can be approximate
It is measured with the decaying of battery capacity in each charge and discharge cycles.Lithium ion battery has good cycle life, present quotient
20% or less can be accomplished by recycling 1000 capacity attenuations with battery 100%DOD.It can be considered that every time in circulation in battery
Side reaction bring energy loss in portion's is less than 2/10000ths of battery gross energy, when estimating the fuel factor of battery high power discharge
It can be ignored.
By analyzing above, can approximatively think to release when the minimum current discharge when battery to approach reversible process
The difference of energy and the energy released in high power discharge is heat power consumption of the battery in high power discharge.Therefore, Ke Yifen
Not Ce Liang battery with released when minimum current discharge energy and high power discharge when the energy released you can get it that high power is put
Heat power consumption when electric.
The technical solution adopted by the present invention is that:
Battery is fully charged with minimum electric current such as 0.01C at a certain temperature T, then with minimum electric current such as 0.01C
Current discharge is to final voltage.Because the charging and discharging currents of battery are minimum, the electric discharge of the battery obtained at this time can be approximately considered
Capacity and discharge energy are exactly all told and whole energy of battery, are denoted as C respectively0And E0。
At same temperature T, battery is fully charged using 0.01C or less electric current, and battery is made to be in 100% charging state, then with
0.01C or less current versus cell discharges, and being discharged to charging state is n%.Then it is put with 0.01C or less current versus cell
Electricity releases m%C0Capacity, be denoted as Cn-m@0.01, while this energy note released of discharging of battery is calculated by integral way
For En-m@0.01。
At same temperature T, battery is fully charged using 0.01C, so that battery is in 100% charging state, then with 0.01C electric current
It discharges battery, being discharged to charging state is n%.Then with high magnification pC to battery discharge, equally releasing m%C0Appearance
Amount, is denoted as Cn-m@p, while by integral way calculate battery this electric discharge release energy be denoted as En-m@p, this electric discharge institute
T is denoted as with the timen-m@p。
Then this tn-m@pAverage heat power consumption when battery is discharged in period with pC, which can be calculate by the following formula, to be obtained:
Wn-m@m=(En-m@0.01-En-m@p)/tn-m@p...............(1)
In above formula:
Wn-m@m: the evenly heat under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, during electric discharge
Power consumption；
En-m@0.01: under temperature T, when battery is in n% charging state, with 0.01C current discharge m% capacity, the energy of releasing；
En-m@p: under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, the energy released；
tn-m@p: under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, discharge time；
It can also use and battery is obtained into n% charging state in such a way that 0.01C or less electric current plugs in.
The above method can be used for battery pack, and entire battery pack is considered as a single battery to consider at this time.
Embodiment 1
It is instantaneous when quickly to estimate certain model 5Ah high-power lithium ion single battery at 25 DEG C with different current discharges
Heat power consumption is tested according to the following steps:
1) following step test all carries out under 25 DEG C of environment temperatures；
2) constant-current charge is carried out to the battery with 1A, after charging to 4.2V, turns constant-voltage charge to electric current and be less than 0.05A；
3) it is discharged with 0.05A battery, final discharging voltage 2.7V obtains battery by discharge time and voltage
Capacity C0With discharge energy E0；
4) constant-current charge is carried out to the battery with 1A, after charging to 4.2V, turns constant-voltage charge to electric current and be less than 0.05A；
5) with 0.05A (being equivalent to 0.01C) to battery discharge, discharge capacity is set as 0.1C0, at this time battery charge state be
90%；
6) with 0.05A (being equivalent to 0.01C) to battery discharge, discharge capacity is set as 0.1C0, corresponding discharge time is
t100-10@0.01, while the discharge energy of the secondary electric discharge is read from discharge equipment, it is denoted as E100-10@0.01；
7) constant-current charge is carried out to the battery with 1A, after charging to 4.2V, turns constant-voltage charge to electric current and be less than 0.05A；
8) with 0.05A (being equivalent to 0.01C) to battery discharge, discharge capacity is set as 0.1C0, at this time battery charge state be
90%；
9) with 0.1A (being equivalent to 0.02C) to battery discharge, discharge capacity is set as 0.1C0, corresponding discharge time is
t100-10@0.02, while the discharge energy of the secondary electric discharge is read from discharge equipment, it is denoted as E100-10@0.02；
10) it according to (1) formula, can calculate when the battery is in 90% charging state at 25 DEG C with 0.02C electric discharge 10%
Average heat power consumption W during capacity100-10@0.02；
11) repeat it is above-mentioned 1)~10), while by it is above-mentioned 9) in discharge current successively replaced by 0.1A (being equivalent to 0.02C)
It is changed to 0.25A (being equivalent to 0.05C), 0.5A (being equivalent to 0.1C), 1A (being equivalent to 0.2C), 2.5A (being equivalent to 0.5C), 5A (phase
When in 1C), 10A (being equivalent to 2C), 20A (being equivalent to 4C), 50A (being equivalent to 10C), 75A (being equivalent to 15C), 100A (be equivalent to
20C), 150A (being equivalent to 30C), 200A (being equivalent to 40C), 300A (being equivalent to 60C), 400A (being equivalent to 80C) are tested,
Can be obtained respectively after test the battery at 25 DEG C in 90% charging state when with 0.05C, 0.1C, 0.2C, 0.5C, 1C, 2C,
Average heat power consumption W during 4C, 10C, 15C, 20C, 30C, 40C, 60C, 80C 10% capacity of electric discharge100-10@0.05、W100-10@0.1、
W100-10@0.2、W100-10@0.5、W100-10@1、W100-10@2、W100-10@4、W100-10@10、W100-10@15、W100-10@20、W100-10@30、
W100-10@40、W100-10@60、W100-10@80；
Above 10)~11 12) will) heat power consumption of battery and each current value take logarithm simultaneously under each discharge current for obtaining in step
Mapping, can obtain the homologous thread of heat power consumption and discharge current as shown in Fig. 1.Abscissa is the logarithm of electric current in attached drawing 1, is indulged
Coordinate is heat power consumption logarithm.
It can be seen that the logarithm of electric current and the logarithm of heat power consumption are in approximate linear relationship from attached drawing 1, and to electricity
Linear relationship becomes apparent from when flowing larger.Analyze this phenomenon, it may be possible to whole since discharge time is shorter when larger current is discharged
A system is less by external condition interference, therefore, can more obtain accurate data, this also further demonstrates of the invention
Advantage and good effect.The heat power consumption under a certain electric current can be quickly found by attached drawing 1.
Embodiment 2
As the extension of above-described embodiment 1, battery is adjusted to a series of different charging states and carried out in the present embodiment 2
Heat power consumption test under different electric currents.
Specific practice is to repeat respectively step test in above-described embodiment 1,5) the is adjusted respectively with the discharge capacity 8) in step
Whole is 0.2C0、0.3C0、0.4C0、0.5C0、0.6C0、0.7C0、0.8C0、0.9C0The charging state of acquisition is respectively 80%, 70%,
60%, 50%, 40%, 30%, 20%, 10%, it can be obtained pair by the test of current values electric discharges different under different charging states
The heat power consumption answered.Each current value and corresponding heat power consumption are taken into logarithm and mapped, available curve as shown in Fig. 2.
It can be seen that from attached drawing 2 to phase under 5Ah ultra high power lithium ion battery difference charging state in this present embodiment
Heat power consumption with electric current is almost the same, is especially apparent in high-multiplying power discharge.The battery can be quickly obtained 25 with reference to the accompanying drawings 2
Each charging state at DEG C, with each current discharge when heat power consumption.
Although the embodiment of the present invention is described above, the invention is not limited to above-mentioned specific implementations
Mode, the above mentioned embodiment is only schematical, be not it is restrictive, those skilled in the art this
Under the enlightenment of invention, without breaking away from the scope protected by the purposes and claims of the present invention, many shapes can also be made
Formula.Within these are all belonged to the scope of protection of the present invention.Based on same principle, this method can also charge to battery high power
When heating power measure.
Claims (2)
1. a kind of evaluation method of battery high power charge and discharge heating power, it is characterised in that: include at least:
By battery at a certain temperature T, charged using the electric current no more than minimum electric current, until it is fully charged, then use
Electric current no more than minimum electric current discharges, until final voltage；The discharge capacity of the battery obtained at this time is considered as battery
All told C0；The discharge energy of the battery obtained at this time is considered as whole ENERGY Es of battery0；
At same temperature T, charge using no more than minimum current versus cell, until it is fully charged, so that battery is in 100%
Charging state, then to discharge no more than minimum current versus cell, being discharged to charging state is n%；Then to be not more than minimum electricity
Stream discharges to battery, releases m%C0Capacity, be denoted as Cn-m@0.01, while battery calculated by integral way this is put
The energy that electricity is released is denoted as En-m@0.01；
At same temperature T, battery is used to charge no more than minimum electric current, until it is fully charged, so that battery is in 100% lotus
Electric state, then to discharge no more than minimum current versus cell, being discharged to charging state is n%；Then with high magnification pC to battery
M%C is released in electric discharge0Capacity, be denoted as Cn-m@p, while this energy note released of discharging of battery is calculated by integral way
For En-m@p, this time used of discharging is denoted as tn-m@p；
Then this tn-m@pAverage heat power consumption when battery is discharged in period with pC, which can be calculate by the following formula, to be obtained:
Wn-m@m=(En-m@0.01-En-m@p)/tn-m@p............... (1)
In above formula:
Wn-m@m: the average hot merit under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, during electric discharge
Consumption；
En-m@0.01: under temperature T, when battery is in n% charging state, to be not more than the current discharge m% capacity of minimum electric current, put
Energy out；
En-m@p: under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, the energy released；
tn-m@p: under temperature T, when battery is in n% charging state, with pC current discharge m% capacity, discharge time.
2. the evaluation method of battery high power charge and discharge heating power according to claim 1, it is characterised in that: the pole
Low current is 0.01C.
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Cited By (1)
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| CN113570116A (en) * | 2021-07-02 | 2021-10-29 | 福建时代星云科技有限公司 | Method for estimating heating power of storage and charging station and terminal |
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