CN103872727B - Method for determining largest use current of lithium-ion battery - Google Patents

Method for determining largest use current of lithium-ion battery Download PDF

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CN103872727B
CN103872727B CN201410062459.4A CN201410062459A CN103872727B CN 103872727 B CN103872727 B CN 103872727B CN 201410062459 A CN201410062459 A CN 201410062459A CN 103872727 B CN103872727 B CN 103872727B
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lithium
ion
voltage
charging
current
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CN103872727A (en
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高峰柱
吴建华
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Chery New Energy Automobile Co Ltd
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Chery New Energy Automobile Technology Co Ltd
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Abstract

The invention discloses a method for determining the largest use current of a lithium-ion battery, belonging to the field of lithium-ion batteries for vehicles. The method comprises the following steps of carrying out charge-discharge on the lithium-ion battery for two to three times by adopting a current of one third of the rated capacity of the lithium battery, and putting the battery aside for one to two hours after the battery is fully charged; detecting the end voltage of the battery and testing equipment; discharging the battery to final discharging voltage by adopting a current with 1 C of nominal capacity, charging for 12 minutes by adopting the current of 1 C, respectively discharging by adopting the current of 0.5C*n, and determining the current with the discharging time being 12 seconds and the discharging voltage being a discharging set voltage as the largest discharging current; performing charge-discharge on the battery for two to three times by adopting the current of 1/3 C, and putting the battery aside for one to two hours after the battery is fully charged; charging the battery by adopting the current of 1 C to the charging upper limit voltage, discharging the battery for 18 minutes by adopting the current of 1 C, respectively charging by adopting the current of 0.5C*m, and determining the current with the charging time being 12 S and the charging voltage being the charging set voltage as the largest charging current. By applying the method, the largest use current is accurately calculated, and the phenomena of overcharging and overdischarging are avoided.

Description

A kind of lithium-ion-power cell maximum uses the determination method of electric current
Technical field
The present invention relates to automobile-used field of lithium ion battery, use particularly to a kind of lithium-ion-power cell maximum The determination method of electric current.
Background technology
Lithium-ion-power cell is widely used in electric automobiles due to himself advantage.But move at lithium ion The use of power battery finds, existing method for soft package lithium ion power, owing to making the selection of material, system Making the difference such as technique, manner of packing, monomer whose bears the ability of electric current and also varies.In actual use, BMS (Battery Management System, battery management system) can be used by BMC (Battery Monitoring Circuit, battery detection loop) and BCU (Battery Control Unit, set of cells control Unit) in time SOC (State Of Charge, the residual capacity) value of feedback battery calculate and monitor this electricity The real conditions in pond.On the premise of not affecting lithium-ion-power cell electrical property, its maximum that can bear Charging and discharging electric current can be that BMS management provides reference data accurately.
Prior art uses flash method, in 0.1~1s, lithium-ion-power cell is used 5C's~20C Electric current carries out discharge and recharge to determine its maximum electric discharge and charging current.
During realizing the present invention, inventor finds that prior art at least there is problems in that
When the big electric current using 5C~20C carries out discharge and recharge, the positive pole oxide of lithium-ion-power cell can be made to send out Raw irreversible reaction, changes the structure of positive pole, the adhesive capacity of negative pole also can be made to change, and causes really Fixed maximum charge and discharge current are inaccurate, thus bring monitoring difficulty to battery management system, cause electricity Easily there is overcharge or overdischarge phenomenon in pond, is substantially reduced the service life of battery, and then increases new forms of energy The cost of automobile, have a strong impact on EV/HEV (Electric Vehicle/Hybrid Electric Vehicle, electronic Automobile/hybrid electric vehicle) etc. the popularization of new forms of energy car.Additionally, due to the maximum charge of lithium-ion-power cell The inaccurate electric current also resulting in its discharge and recharge determined with discharge current selects unreasonable, if charging current Select the least, then the charging interval is long, and caloric value is big, and wasting while, car load uses inconvenience;If Charging current selects excessive, high to lithium-ion-power cell monomer, BMS and car load hardware requirement, puts into relatively Greatly, and occur that the risk of safety problem is multiplied.If discharge current selects the least, when actual design The number of batteries needed is many, increases cost and complete vehicle weight, too increases the control requirement of BMC and BCU; If discharge current selects relatively big, during use, wire, control hardware easily generate heat and produce electromagnetic interference, with Sample, when increasing cost and putting into, adds and controls difficulty and the possibility of security risk occur.
Summary of the invention
Inaccurate asking is determined in order to solve lithium-ion-power cell maximum charge and discharge current in prior art Topic, embodiments provides a kind of lithium-ion-power cell maximum and uses the determination method of electric current.Described Technical scheme is as follows:
Embodiments provide a kind of lithium-ion-power cell maximum and use the determination method of electric current, described Method includes:
Described lithium ion is moved by the electric current using 1/3 size of the rated capacity of lithium-ion-power cell to be measured Power battery charging and discharging circulates 2~3 times, and circulation operation shelves 1~2h after completing and being fully charged again;
Measure the terminal voltage of described lithium-ion-power cell and the terminal voltage of test equipment;
Described lithium-ion-power cell is discharged into final discharging voltage by the electric current using nominal capacity size 1C, Shelve 3~5min, use the electric current charging 12min of described nominal capacity size 1C, shelve 3~5min, adopt Use 0.5C*n current discharge, by discharge time be 12s, the discharge voltage that records be electric discharge voltage is set time pair The electric current answered is defined as maximum discharge current Idis-max1, it is that final discharging voltage value subtracts that described electric discharge arranges voltage Remove the difference Δ V of the terminal voltage of described lithium-ion-power cell and the terminal voltage of described test equipment, wherein, N ∈ [Isosorbide-5-Nitrae 0] and be positive integer, described nominal capacity size 1C is for using the specified appearance of described lithium-ion-power cell The electric current of 1/3 size of amount is to last the putting in described lithium-ion-power cell charge and discharge cycles 2~3 times Capacitance;
The electric current of the 1/3 of employing nominal capacity size 1C is to described lithium-ion-power cell charge and discharge cycles 2~3 Secondary, circulation operation shelves 1~2h after completing and being fully charged again;
The electric current using described nominal capacity size 1C charges to charging upper limit electricity to described lithium-ion-power cell Pressure, shelves 3~5min, uses the current discharge 18min of described nominal capacity size 1C, shelve 3~5min, Use the charging of 0.5C*m electric current, by the charging interval be 12s, the charging voltage that records be charging voltage is set time Corresponding electric current is defined as maximum charging current Icharge-max1, it is charging upper limit voltage that described charging arranges voltage Plus the difference Δ V of terminal voltage of terminal voltage and the described test equipment of described lithium-ion-power cell, wherein, M ∈ [1,40] and be positive integer.
Alternatively, described method also includes: be that described electric discharge arranges electricity for 12s, discharge voltage between upon discharging During pressure, measure the Positive Poles of described lithium-ion-power cell and the temperature in centre position, when meeting: described Positive Poles is more than with difference DELTA T1 >=25 DEG C of the temperature in described centre position, described Positive Poles temperature 50 DEG C, the temperature in described centre position more than 50 DEG C, in above-mentioned three kinds of situations any one or multiple time, institute State maximum discharge current and be defined as Idis-max, and Idis-max=Idis-max1-0.1C*a, wherein, a is 1,2,3.
Alternatively, described method also includes: be that described charging arranges electricity for 12s, charging voltage between when charging During pressure, measure described Positive Poles and the temperature in described centre position, when meeting: described Positive Poles and institute State difference DELTA T2 >=20 DEG C of the temperature in centre position, described Positive Poles temperature more than 45 DEG C, described in Between the temperature of position more than 45 DEG C, in above-mentioned three kinds of situations any one or multiple time, described maximum charge electricity Stream is defined as Icharge-max, and Icharge-max=Icharge-max1-0.1C*b, wherein, b is 1,2,3.
Preferably, described centre position be described lithium-ion-power cell body height 1/2 plus described The position of the 1/2 of Positive Poles height.
Alternatively, after shelving 1~2h again after circulation operation completes and be fully charged, described method also includes:
Observe whether the change in terminal voltage 30min of described lithium-ion-power cell is 0.
Preferably, the temperature of the test environment of described lithium-ion-power cell is 24.5~25.5 DEG C.
Further, described method also includes:
Described lithium-ion-power cell is shelved in the temperature of described test environment 4~5h.
Alternatively, described lithium-ion-power cell be metal, plastics duricrust, aluminum-plastic composite membrane Soft Roll lithium from One in sub-electrokinetic cell.
Preferably, described maximum discharge current Idis-maxWith Idis-max1, described maximum charging current Icharge-maxWith Icharge-max1Being integer, and carry when meeting fractional part>=0.8, fractional part<is cast out when 0.8.
Alternatively, described method also includes:
Utilize test lead, by the both positive and negative polarity of described lithium-ion-power cell respectively with described test equipment just Negative pole is connected, and the resistance of described test lead is less than or equal to 10m Ω.
The technical scheme that the embodiment of the present invention provides has the benefit that
By, under the low SOC state of lithium-ion-power cell, it being charged and discharged, do not damaging On the premise of battery electrical property, being determined by repeatedly in charge and discharge process, the discharge and recharge time is 12s, and electric discharge Voltage and charging voltage respectively reach electric current when final discharging voltage and charging upper limit voltage, accurately calculate Maximum discharge current that battery can bear and maximum charging current, convenient, fast, data process simple, Easily grasp, effectively avoid overcharge and the overdischarge phenomenon of lithium-ion-power cell, it is ensured that battery In service life, reduce the cost of new-energy automobile, and be conducive to it to promote.Additionally, maximum is filled accurately Electricity and discharge current can be that the charging and discharging currents of the actual needs of lithium-ion-power cell provides strong ginseng Examine, and then solve its charging and discharging currents and select the unreasonable and various problems brought.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, institute in embodiment being described below The accompanying drawing used is needed to be briefly described, it should be apparent that, the accompanying drawing in describing below is only the present invention Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, Other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that a kind of lithium-ion-power cell maximum that the embodiment of the present invention one provides uses electric current to determine method Flow chart;
Fig. 2 is that a kind of lithium-ion-power cell maximum that the embodiment of the present invention two provides uses electric current to determine method Flow chart;
Fig. 2 a is the maximum process using electric current of the determination lithium-ion-power cell that the embodiment of the present invention two provides In the layout schematic diagram of temperature sensor.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to the present invention Embodiment is described in further detail.
Embodiment one
Embodiments providing a kind of lithium-ion-power cell maximum uses electric current to determine method, sees figure 1, method includes:
Step 101: use the rated capacity of lithium-ion-power cell to be measured 1/3 size electric current to lithium from Sub-electrokinetic cell charge and discharge cycles 2~3 times, circulation operation shelves 1~2h after completing and being fully charged again.
Step 102: measure the terminal voltage of lithium-ion-power cell and the terminal voltage of test equipment.
Step 103: use the electric current of nominal capacity size 1C that lithium-ion-power cell is discharged into discharge off Voltage, shelves 3~5min, uses the electric current charging 12min of nominal capacity size 1C, shelves 3~5min, Being respectively adopted 0.5C*n current discharge, will be 12s discharge time, the discharge voltage recorded be that electric discharge arranges electricity Electric current corresponding during pressure is defined as maximum discharge current Idis-max1, it is final discharging voltage value that electric discharge arranges voltage Deduct the difference Δ V of the terminal voltage of lithium-ion-power cell and the terminal voltage of test equipment, wherein, n ∈ [Isosorbide-5-Nitrae 0] and For positive integer, nominal capacity size 1C is the electric current of 1/3 size using lithium-ion-power cell rated capacity To the last discharge capacity in lithium-ion-power cell charge and discharge cycles 2~3 times.
Step 104: lithium-ion-power cell discharge and recharge is followed by the electric current of the 1/3 of employing nominal capacity size 1C Ring 2~3 times, circulation operation shelves 1~2h after completing and being fully charged again.
Step 105: use the electric current of nominal capacity size 1C that lithium-ion-power cell is charged to charging upper limit Voltage, shelves 3~5min, uses the electric current of nominal capacity size 1C to battery discharge 18min to be measured, shelves 3~5min, it is respectively adopted the charging of 0.5C*m electric current, will the charging interval be 12s, the charging voltage recorded is for filling The electric current that electricity is corresponding when arranging voltage is defined as maximum charging current Icharge-max1, charging arranges voltage for charging The difference Δ V of terminal voltage of the upper voltage limit terminal voltage plus lithium-ion-power cell and test equipment, wherein, M ∈ [1,40] and be positive integer.
Wherein, maximum use electric current to include maximum discharge current and maximum charging current, final discharging voltage and Charging upper limit voltage is provided by cell production companies, and the final discharging voltage of usual lithium-ion-power cell is 2.5V~2.7V, charging upper limit voltage is 3.7V~4.2V.
It, by under the low SOC state of lithium-ion-power cell, is charged and puts by the embodiment of the present invention Electricity, on the premise of not damaging battery electrical property, is determined by repeatedly in charge and discharge process, the discharge and recharge time For 12s, and electricity when discharge voltage and charging voltage respectively reach final discharging voltage and charging upper limit voltage Stream, accurately calculates maximum discharge current and maximum charging current that battery can bear, convenient, fast, Data process simple, easily grasp, effectively avoid overcharge and the overdischarge phenomenon of lithium-ion-power cell, Ensure that the service life of battery, reduce the cost of new-energy automobile, and be conducive to it to promote.Additionally, Maximum charge and discharge current can be that the charging and discharging currents of the actual needs of lithium-ion-power cell carries accurately For strong reference, and then solve its charging and discharging currents and select various problems that are unreasonable and that bring.
Embodiment two
Embodiments providing a kind of lithium-ion-power cell maximum uses electric current to determine method, sees figure 2, the method includes:
Step 201: utilize test lead, by the both positive and negative polarity of lithium-ion-power cell respectively with test equipment just Negative pole is connected, and guarantees firmly.
Wherein, test equipment is that high-precision alternating current is converted to galvanic lithium ion battery test equipment. In the present embodiment, the current resolution 0.0001A of test equipment, voltage resolution is 0.0001V, data Log resolution is 0.001S, and the maximum range electric current of test equipment is lithium-ion-power cell actual discharge 15~20 times of capacity.
When implementing, in addition it is also necessary to the resistance of test lead is less than or equal to 10m Ω, i.e. need to measure lithium ion Power battery anode and measure traverse line contact internal resistance and negative pole and measure traverse line contact internal resistance, it is ensured that front State both of which in controlled range, ensure the accuracy of result reducing error.It should be noted that contact The concrete span of control of internal resistance is also possible to because of the difference of test equipment, battery pole ear etc. different.
It should be noted that torque spanner can be used, make the connection of lithium-ion-power cell and test equipment Reach torque value and ensure the firm of connection.
In the present embodiment, lithium-ion-power cell is the Soft Roll lithium of metal, plastics duricrust, aluminum-plastic composite membrane One in ion battery.
Step 202: lithium-ion-power cell is shelved in the temperature of test environment 4~5h.
Preferably, the temperature of the test environment of lithium-ion-power cell is 24.5~25.5 DEG C.Open ambient temperature Control power supply, and the temperature of adjusting ambient, when monitoring temperature and being 25 DEG C, lithium-ion-power cell is put Put wherein 4~5h, at room temperature shelve the sufficiently long time, make the inside and outside environment of lithium-ion-power cell Temperature reaches basically identical, and stable.
Step 203: use the electric current of 1/3 size of the rated capacity of lithium-ion-power cell to lithium ion power Battery charging and discharging circulates 2~3 times, and circulation operation shelves 1~2h after completing and being fully charged again.
Lithium-ion-power cell is first carried out the charge-discharge test of 2~3 times, to ensure lithium ion power to be measured Battery can complete stable discharge and recharge.Lithium-ion-power cell is put after completing and being fully charged by circulation operation again Put 1~2h, reached steady statue with the electric current after ensureing battery charging to be measured, voltage etc..
The method can also include: whether the change observed in the voltage 30min of lithium-ion-power cell is 0. This step is carried out after step 203.When observing the change in voltage in 30min, can continue to extend Observing time, usual 30min is sufficiently long, and lithium-ion-power cell to be measured has been stablized, i.e. voltage No longer change;When observing that voltage no longer changes, can be proceeded next step.To be measured by observing The situation of change of the voltage of lithium-ion-power cell, is further ensured that lithium-ion-power cell to be measured has reached To steady statue, and then ensure the accuracy of test result.
Step 204: measure the terminal voltage of lithium-ion-power cell and the terminal voltage of test equipment.
Specifically, circuit tester (such as, five half circuit testers) can be used to measure lithium ion to be measured move The terminal voltage of power battery and the terminal voltage of test equipment.
When realizing, the method can also include after step 204: calculates the end electricity of lithium-ion-power cell The difference Δ V of the terminal voltage of pressure and test equipment, to facilitate subsequent step to use.Δ V essence is test lead Voltage loss.
Step 205: use the electric current of nominal capacity size 1C that lithium-ion-power cell is discharged into discharge off Voltage, shelves 3~5min, uses the electric current charging 12min of nominal capacity size 1C, shelves 3~5min, Being respectively adopted 0.5C*n current discharge, will be 12s discharge time, the discharge voltage recorded be that electric discharge arranges electricity Electric current corresponding during pressure is defined as maximum discharge current Idis-max1, it is final discharging voltage value that electric discharge arranges voltage Deduct the difference Δ V of the terminal voltage of lithium-ion-power cell and the terminal voltage of test equipment, wherein, n ∈ [Isosorbide-5-Nitrae 0] and For positive integer.
Nominal capacity size 1C be use lithium-ion-power cell rated capacity 1/3 size electric current to lithium from Last discharge capacity in sub-electrokinetic cell charge and discharge cycles 2~3 times.Due to the offer of battery producer The nominal capacity of lithium-ion-power cell is often below the capability value of its reality, also test environment and equipment Difference, the value of lithium-ion-power cell 1C would also vary from, in order to test result is more accurate, so at this Invention has redefined nominal capacity size 1C of lithium-ion-power cell.
Use the electric current charging 12min of nominal capacity size 1C, make the electricity of lithium-ion-power cell to be measured It is 20% rather than is in the state discharged completely, battery polarization when can be effectively prevented recharged Phenomenon.Here charging interval is the result obtained after test of many times.
In the present embodiment, the method is 12s between also including measuring upon discharging, and discharge voltage is that electric discharge sets The Positive Poles of lithium-ion-power cell when putting voltage and the temperature in centre position, when meet Positive Poles with Difference DELTA T1 >=25 DEG C of the temperature in centre position, Positive Poles temperature more than 50 DEG C, the temperature in centre position big In 50 DEG C any one or multiple time, maximum discharge current is defined as Idis-max, and Idis-max=Idis-max1-0.1C*a, wherein, a is 1,2,3.It is to say, step 205 also needs to just meeting Pole pole and temperature gap Δ T1≤25 DEG C in centre position, and the temperature in Positive Poles and centre position is the most not More than 50 DEG C.
Correspondingly, lithium-ion-power cell is installed at least 2 temperature sensors, fixes in the battery for 1 Between position, to gather the temperature data of lithium-ion-power cell center surface, another 1 is fixed on Positive Poles Place gathers the temperature data of positive pole.
Wherein, centre position be lithium-ion-power cell body height 1/2 plus Positive Poles height The position of 1/2.See Fig. 2 a, 41a and 41b and be respectively both positive and negative polarity pole, 43 for test lead, 44 and 45 be two temperature sensors, 46 for housing, B is the 1/2 of the body height of lithium-ion-power cell, and C is just The 1/2 of pole pole height, A is centre position.
Step 206: lithium-ion-power cell discharge and recharge is followed by the electric current of the 1/3 of employing nominal capacity size 1C Ring 2~3 times, circulation operation shelves 1~2h after completing and being fully charged again.
To lithium-ion-power cell charge and discharge cycles 2~3 times, circulation operation is shelved after completing and being fully charged again 1~2h so that it is internal fully balance, material structure recover, and eliminate SEI (the Solid Electrolyte that polarization causes Interface, solid electrolyte interface) film out-of-flatness, thus ensure the accuracy of test result.
Similarly, can also use after step 206 and observe the voltage 30min of lithium-ion-power cell Whether interior change is 0, determines whether lithium-ion-power cell reaches steady statue.
Step 207: use the electric current of nominal capacity size 1C that lithium-ion-power cell is charged to charging upper limit Voltage, shelves 3~5min, uses the electric current of nominal capacity size 1C to discharge lithium-ion-power cell 18min, Shelve 3~5min, be respectively adopted the charging of 0.5C*m electric current, will the charging interval be 12s, the charging voltage recorded Electric current corresponding when arranging voltage for charging is defined as maximum charging current Icharge-max1, charging arranges voltage and is Charging upper limit voltage adds the terminal voltage of lithium-ion-power cell and the difference Δ V of the terminal voltage of test equipment, its In, m ∈ [Isosorbide-5-Nitrae 0] and be positive integer.
Use the current discharge 18min of nominal capacity size 1C, make the electricity of lithium-ion-power cell to be measured Being 70%, during to prevent large current charge, the excessive inside side reaction caused of battery polarization is too much, putting here The electricity time is also for the result obtained after test of many times.
In the present embodiment, the method also includes: for 12s between measuring when charging, and charging voltage is charging Positive Poles when arranging voltage and the temperature in centre position, when the temperature meeting Positive Poles and centre position Difference DELTA T2 >=20 DEG C, Positive Poles temperature more than 45 DEG C, the temperature in centre position more than 45 DEG C in Any one or multiple time, maximum charging current is Icharge-max, and Icharge-max=Icharge-max1-0.1C*b, wherein, B is 1,2,3.It is to say, step 207 also should meet the temperature gap of Positive Poles and centre position Δ T2≤20 DEG C, and the temperature in Positive Poles and centre position is all not more than 45 DEG C.
When realizing, maximum discharge current Idis-maxWith Idis-max1, maximum charging current Icharge-maxWith Icharge-max1 Being integer, and carry when meeting fractional part>=0.8, fractional part<is cast out when 0.8.
In step 205 and 207, shelve 3~5min, preferably 5min.In order to ensure the result of test Accuracy, the time every time shelved all should be identical, such as, is 5min.It should be noted that put The time put also suffers from the impact of the conditions such as the degree of accuracy of lithium-ion-power cell to be measured, therefore can also root The time that the prolongation suitable according to concrete battery to be measured or shortening are shelved.
It should be noted that during realizing, be 12s between general strict demand upon discharging, electric discharge electricity Pressure and charging voltage must be exactly equal to electric discharge respectively and arrange voltage and charging arranges voltage.But because of test wrapper The impact in border etc., discharge voltage now and charging voltage can also arrange voltage and charging sets in electric discharge respectively Put fluctuating of voltage.Easy to understandly, this floating is the smaller the better, and the rate of being generally near should be 99.999%.
Below with the maximum charging current I of the 45Ah lithium-ion-power cell of box hat LiFePO 4 materialcharge-max With maximum discharge current Idis-maxPut and as a example by determining process, step 201~206 are illustrated.Wherein, Battery Plant The charging upper limit voltage that family provides is 3.7V, and final discharging voltage is 2.5V.
This lithium-ion-power cell is fixed on the both positive and negative polarity wire of test equipment, it is ensured that after Lao Gu, test The internal resistance that contacts of battery positive and negative electrode pole and measure traverse line, positive pole and measure traverse line are 3m Ω, negative pole and survey Amount wire is 0.8m Ω.1 temperature sensor position centerlock (is seen Fig. 2 a, this electricity simultaneously The body height in pond is 180mm, and Positive Poles height is 20mm, then centre position is short transverse (180+20/2) at/2=95mm), another 1 is fixed at Positive Poles.
Open ambient temperature and control power supply, make this lithium-ion-power cell shelve under 25 ± 0.5 DEG C of environment 4~5h.Then, open test device power supply (DPS), by 1/3 size of battery rated capacity 45Ah that producer provides Electric current make 3 circles and stablize charge-discharge test, fully charged after shelve 1~2h, when the voltage observing this battery exists In 30min when being changed to 0, measure the terminal voltage of the terminal voltage of this battery and test equipment with circuit tester, and Calculate both difference DELTA V aforementioned, obtain Δ V=0.003V.Measure simultaneously and obtain nominal capacity size 1C=45.5237Ah.
Use 1C electric current by this battery discharge to 2.5V, shelve 5min, use the electricity of nominal capacity size 1C Current charge 12min, shelves 5min, be respectively adopted 0.5C*n (wherein n=1,2,3 ..., 16) electric current put Electricity, it is 2.497V that electric discharge now arranges voltage.Test data are shown in Table 1:
Table 1 maximum discharge current test data
Sequence number Electric current Time Corresponding voltage Positive pole temperature Medium temperature ΔT
1 22.7618A 12s 3.0135V 25.07℃ 25.53℃ 0.46℃
2 45.5237A 12s 3.0110V 25.97℃ 26.74℃ 0.77℃
3 68.2855A 12s 3.0091V 28.08℃ 29.94℃ 1.86℃
……
14 341.4277A 12s 2.5333V 32.41℃ 38.97℃ 6.56℃
15 364.1896A 12s 2.4971V 33.25℃ 41.72℃ 8.47℃
16 386.9514A 9.75s 2.4968V 35.22℃ 44.92℃ 9.7℃
The maximum discharge current of this 45Ah LiFePO4 box hat battery is can be seen that by above-mentioned data Idis-max=364A.
After maximum discharge current has been tested, the current charge-discharge electricity of the 1/3 of employing nominal capacity size 1C Circulate 3 times, fully charged after shelve 1~2h, when observe this battery voltage in 30min when being changed to 0, The electric current using nominal capacity size 1C charges to 3.7V to this battery, shelves 5min, uses nominal capacity Size 1C current versus cell electric discharge 18min, shelve 5min, be respectively adopted 0.5C*m (wherein, m=1,2, 3 ..., 8) electric current charging, it is 3.703V that charging now arranges voltage.Test data are shown in Table 2:
Table 2 maximum charging current test result one
Sequence number Electric current Time Corresponding voltage Positive pole temperature Medium temperature ΔT
1 22.7618A 12s 3.3933V 25.07℃ 25.01℃ -0.06℃
2 45.5237A 12s 3.4532V 26.38℃ 26.74℃ 0.36℃
3 68.2855A 12s 3.4811V 29.99℃ 29.94℃ -0.05℃
……
7 182.0948A 12s 3.6924V 39.75℃ 41.11℃ 1.36℃
8 203.5665A 12s 3.7036V 45.96℃ 47.73℃ 1.77℃
As can be seen from Table 2 at Icharge-max1During=203.5665A, battery medium temperature be more than 45 DEG C, then this Time, Icharge-max=203.5665-0.1C*b, wherein, b=1,2,3.Test data are shown in Table 3:
Table 3 maximum charging current test result two
Sequence number Electric current Time Corresponding voltage Positive pole temperature Medium temperature ΔT
1 199.0141A 12s 3.7003V 44.07℃ 45.01℃ 0.94℃
2 194.4618A 12s 3.6991V 43.33℃ 44.68℃ 1.35℃
3 189.9095A 12s 3.6972V 43.71℃ 44.44℃ 0.73℃
As can be seen from Table 3 by the maximum charging current of this 45Ah ferric phosphate lithium cell after temperature adjustmemt Icharge-maxFor 194A.
It, by under the low SOC state of lithium-ion-power cell, is charged and puts by the embodiment of the present invention Electricity, on the premise of not damaging battery electrical property, is determined by repeatedly in charge and discharge process, the discharge and recharge time For 12s, and electricity when discharge voltage and charging voltage respectively reach final discharging voltage and charging upper limit voltage Stream, accurately calculates maximum discharge current and maximum charging current that battery can bear, convenient, fast, Data process simple, easily grasp, effectively avoid overcharge and the overdischarge phenomenon of lithium-ion-power cell, Ensure that the service life of battery, reduce the cost of new-energy automobile, and be conducive to it to promote.Additionally, Maximum charge and discharge current can be that the charging and discharging currents of the actual needs of lithium-ion-power cell carries accurately For strong reference, and then solve its charging and discharging currents and select various problems that are unreasonable and that bring.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all the present invention's Within spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in the present invention's Within protection domain.

Claims (9)

1. the determination method of a lithium-ion-power cell maximum use electric current, it is characterised in that described method Including:
Described lithium ion is moved by the electric current using 1/3 size of the rated capacity of lithium-ion-power cell to be measured Power battery charging and discharging circulates 2~3 times, and circulation operation shelves 1~2h after completing and being fully charged again;
Measure the terminal voltage of described lithium-ion-power cell and the terminal voltage of test equipment;
Described lithium-ion-power cell is discharged into final discharging voltage by the electric current using nominal capacity size 1C, Shelve 3~5min, use the electric current charging 12min of described nominal capacity size 1C, shelve 3~5min, adopt Use 0.5C*n current discharge, will be 12s discharge time and discharge voltage reaches electric discharge and arranges during voltage corresponding Electric current be defined as maximum discharge current Idis-max1, it is that final discharging voltage value deducts that described electric discharge arranges voltage The difference Δ V of the terminal voltage of the terminal voltage of described lithium-ion-power cell and described test equipment, wherein, N ∈ [Isosorbide-5-Nitrae 0] and be positive integer, described nominal capacity size 1C is for using the specified appearance of described lithium-ion-power cell The electric current of 1/3 size of amount is to last the putting in described lithium-ion-power cell charge and discharge cycles 2~3 times Capacitance;
The electric current of the 1/3 of employing nominal capacity size 1C is to described lithium-ion-power cell charge and discharge cycles 2~3 Secondary, circulation operation shelves 1~2h after completing and being fully charged again;
The electric current using described nominal capacity size 1C charges to charging upper limit electricity to described lithium-ion-power cell Pressure, shelves 3~5min, uses the current discharge 18min of described nominal capacity size 1C, shelve 3~5min, Use the charging of 0.5C*m electric current, will be 12s the charging interval and charging voltage reaches when charging arranges voltage pair The electric current answered is defined as maximum charging current Icharge-max1, it is that charging upper limit voltage adds that described charging arranges voltage The terminal voltage of upper described lithium-ion-power cell and the difference Δ V of the terminal voltage of described test equipment, wherein, M ∈ [1,40] and be positive integer.
Method the most according to claim 1, it is characterised in that described method also includes: upon discharging Between for 12s, discharge voltage be described electric discharge voltage is set time, measure the positive pole pole of described lithium-ion-power cell Post and the temperature in centre position, when meeting: the difference of the temperature in described Positive Poles and described centre position Δ T1 >=25 DEG C, described Positive Poles temperature more than 50 DEG C, the temperature in described centre position more than 50 DEG C, above-mentioned In three kinds of situations any one or multiple time, described maximum discharge current is defined as Idis-max, and Idis-max=Idis-max1-0.1C*a, wherein, a is 1,2,3;Described centre position is described lithium ion power electricity The 1/2 of the body height in pond plus described Positive Poles height 1/2 position.
Method the most according to claim 1, it is characterised in that described method also includes: when charging Between for 12s, charging voltage be described charging voltage is set time, measure the positive pole pole of described lithium-ion-power cell Post and the temperature in centre position, when meeting: the difference DELTA of the temperature in described Positive Poles and described centre position T2 >=20 DEG C, described Positive Poles temperature more than 45 DEG C, the temperature in described centre position more than 45 DEG C, on State any one in three kinds of situations or multiple time, described maximum charging current is defined as Icharge-max, and Icharge-max=Icharge-max1-0.1C*b, wherein, b is 1,2,3;Described centre position is that described lithium ion moves The 1/2 of the body height of power battery plus described Positive Poles height 1/2 position.
Method the most according to claim 1, it is characterised in that after circulation operation completes and be fully charged After shelving 1~2h again, described method also includes:
Observe whether the change in terminal voltage 30min of described lithium-ion-power cell is 0.
Method the most according to claim 1, it is characterised in that the test of described lithium-ion-power cell The temperature of environment is 24.5~25.5 DEG C.
Method the most according to claim 5, it is characterised in that described method also includes:
Described lithium-ion-power cell is shelved in the temperature of described test environment 4~5h.
Method the most according to claim 1, it is characterised in that described lithium-ion-power cell be metal, Plastics duricrust, aluminum-plastic composite membrane method for soft package lithium ion power in one.
Method the most according to claim 1, it is characterised in that described maximum discharge current Idis-maxWith Idis-max1, described maximum charging current Icharge-maxWith Icharge-max1It is integer, and meets fractional part >=0.8 Shi Jinwei, fractional part < is cast out when 0.8.
Method the most according to claim 1, it is characterised in that described method also includes:
Utilize test lead, by the both positive and negative polarity of described lithium-ion-power cell respectively with the both positive and negative polarity of described test equipment Being connected, the resistance of described test lead is less than or equal to 10m Ω.
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