CN1917268A - Method for fabricating energy stored lithium battery pile, and energy stored lithium battery pile - Google Patents
Method for fabricating energy stored lithium battery pile, and energy stored lithium battery pile Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
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- 238000004146 energy storage Methods 0.000 claims description 71
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- 208000031639 Chromosome Deletion Diseases 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
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Abstract
The invention solves issue of low performance of energy stored lithium battery pile caused by inconsistent parameter of single lithium battery in procedure for producing lithium battery pile. The method includes steps: calculating difference values between static internal resistances of multiple single lithium batteries and referenced static internal resistance so as to obtain multiple single lithium batteries, in which the said difference values are smaller than a prearranged threshold; according to requirement of quantity of single lithium battery, the obtained multiple single lithium batteries are combined in series and parallel so as to form energy stored lithium battery pile. The invention is important for raising performance, charge-discharge efficiency, prolonging stand-by time and service life of periodic duty of lithium battery pile as well as reinforcing safety and stability. The invention is feasible and convenient for operation.
Description
Technical field
The present invention relates to field of power supplies, relate in particular to a kind of method for fabricating energy stored lithium battery pile and a kind of energy storage lithium battery group.
Background technology
Current use mainly adopts lithium ion battery to combine by series/parallel in the energy storage lithium battery group in fields such as portable computer portable power source system.Common compound mode has 3 strings 2 also, 3 strings 3 also, 4 strings 2 and or the like.Usually nominal voltage is generally 10.8V or 14.4V, and nominal capacity is 4400mAh or 6600mAh.Present part portable power source manufacturer, in assembly energy storage lithium battery group, take the single lithium battery of the same specification of same battery supplier combo at random, the manufacturer that technology is relatively leading then takes on the former basis, requires same batch single lithium battery combo at random again.Energy storage lithium battery group belongs to electrochemical product, and its performance is subjected to raw material, technology, environment (such as temperature, humidity etc.) influence is very big, even same batch single lithium battery, also there is certain discreteness in its performance, if different batches, its discreteness will be bigger.Therefore in energy storage lithium battery group charge and discharge process, meeting is inconsistent because of the single lithium battery parameter, thereby cause battery overcharge, overdischarge, stand-by time short, recycle short, fail safe of life-span and stability low, have the potential risk of major accidents such as causing portable power source burning, on fire even blast.
Fig. 1 is the portable computer portable power source system main circuit block diagram that contains energy storage lithium battery group.As can be seen from Fig. 1, mainly by battery pack, management of charging and discharging unit (Gas Gauge), protected location, memory cell, sampling unit, insurance (Fuse), discharge and recharge power field effect pipe MOSFET, electro-hot regulator and interface and form.Management of charging and discharging and communication unit will be to the portable power source system voltages; electric current; electric weight; parameters such as temperature are given main frame by interface report; protected location is by the monitoring to cell voltage and electric current; when parameter surpassed certain limit, break-make and the Fuse of protected location by power controlling MOSFET realized protection to portable power source system and Host Security.
The portable power source system is divided into three grades usually because of the accident that the inefficacy of energy storage lithium battery group causes, that is: serious accident: the burning of energy storage lithium battery group, and on fire, blast, serious threat Host Security even personal safety; Ordinary accident: mechanicalness or the damage of electric property appear in energy storage lithium battery group, can not work; Minor accident: it is low that capacity appears in energy storage lithium battery group, and cycle life is short, and metering is inaccurate, influences operate as normal.
Fig. 2 is for being electrically connected schematic diagram after the assembling of single lithium battery equivalent electric circuit in the energy storage lithium battery group.As shown in Figure 2, this single lithium battery combines according to 3 strings 2 mode also.Single lithium battery of expression in each frame of broken lines, each single lithium battery is represented by 5 equivalent parameterses.Wherein Q represents its capacity; RL represents the internal resistance of battery electrolyte inside, and its resistance changes with its change in voltage; ESR is the battery lead equivalent series resistance; ESL is the battery lead equivalent series inductance, and U1, U2, U3 are respectively the B1 group, B2 group, the terminal voltage of B3 Battery pack.V1=U1, V2=U1+U2, V3=U1+U2+U3, DCPOWERSUPPLY are dc current regulator power supply, RLOAD is an external loading.
When energy storage lithium battery group is charged, because the inconsistency of single lithium battery, U1, U2 always has wherein 1 and will be higher than two other among the U3.Suppose U1＞U2=U3, (first constant current charge constant voltage charge behind the 12.6V equals 0.01C to electric current when energy storage lithium battery group is finished standard charging
5A) time, necessarily greater than B2 group and B3 group single lithium battery, the capacity that this moment just occurs three groups of single lithium battery is unbalanced for the B1 group capacity that single lithium battery charged into.If its voltage inconsistency surpasses a certain scope; the additives for overcharge protection scope that the high voltage single lithium battery has reached portable power source system protection unit will take place; and the low-voltage single lithium battery is not finished standard charging; so in discharge process; the single lithium battery of low capacity will reach over voltage earlier; and the capacity of high voltage single lithium battery does not still discharge fully, and simultaneously, the high pressure single lithium battery also has danger such as the infringement of generating heat because of overcharging.
Fig. 3 overcharges to the figure that influences of single lithium battery cycle life for a long time for single lithium battery.Usually, the charging deboost of single lithium battery be 4.2V (carbon electrode for 4.1V, graphite electrode be 4.2V), cycle life is more than 500 times, promptly single lithium battery is after circulating for 500 times, capacity attenuation is to 70% of nominal capacity.Overcharge influence for a long time by what Fig. 3 can find out single lithium battery intuitively to its cycle life.
Summary of the invention
The invention provides a kind of method for fabricating energy stored lithium battery pile and a kind of energy storage lithium battery group, in order to solve occurring when inconsistent when the supplied materials single lithium battery of existing in the prior art, can cause partial monosomy over-charge of lithium battery electricity, overdischarge, and cause energy storage lithium battery group stand-by time weak point, cycle life to be lacked, fail safe and the low problem of stability.
The present invention includes:
A kind of method for fabricating energy stored lithium battery pile is characterized in that, may further comprise the steps:
A, internal resistances of a plurality of single lithium battery static state of calculating and the static internal resistance difference of reference obtain and the single lithium battery of the static internal resistance difference of reference less than the static internal resistance difference threshold of setting;
B, with the single lithium battery that obtains in the abovementioned steps, according to single lithium battery quantitative requirement connection in series-parallel combination, form energy storage lithium battery group.
Described static internal resistance difference threshold is 1～10m Ω.
Described static internal resistance difference threshold is 1～5m Ω.
Also comprise step before the described step B:
B1, in the resulting a plurality of single lithium battery of abovementioned steps, calculate a plurality of single lithium battery open circuit voltages with reference to the open circuit voltage difference, obtain with reference to the open circuit voltage difference less than the single lithium battery of setting open circuit voltage difference threshold value.
Described open circuit voltage difference threshold value is 1～100mV.
Described open circuit voltage difference threshold value is 1～20mV.
Also comprise step before the described step B:
B2, in the resulting a plurality of single lithium battery of abovementioned steps, calculate under a certain multiplying power of a plurality of single lithium battery capacity with reference to capacity difference, obtain with reference to capacity difference less than the single lithium battery of setting the capacity difference threshold value.
Described battery capacity difference threshold is 5～100mAh.
Described battery capacity difference threshold is 5～20mAh.
Also comprise step before the described step B:
B3, in the resulting a plurality of single lithium battery of abovementioned steps, calculate under a certain multiplying power of a plurality of single lithium battery efficiency for charge-discharge with reference to the efficiency for charge-discharge difference, obtain with reference to the efficiency for charge-discharge difference less than the single lithium battery of setting the efficiency for charge-discharge difference threshold.
Described efficiency for charge-discharge difference threshold is 1～10%.
Described efficiency for charge-discharge difference threshold is 1～3%.
Also comprise step before the described step B:
B4, in the resulting a plurality of single lithium battery of abovementioned steps, calculate a plurality of single lithium battery discharge platform times with reference to the discharge platform time difference, obtain with reference to the discharge platform time difference less than the single lithium battery of setting discharge platform time difference threshold value.
Described discharge platform time difference threshold value is 1～10min.
Described discharge platform time difference threshold value is 1～3min.
Also comprise step before the described step B:
B5, in the resulting a plurality of single lithium battery of abovementioned steps, calculate a plurality of single lithium battery discharge knee voltages in latter stage with reference to discharge knee voltage difference in latter stage, obtain with reference to discharge knee voltage difference in latter stage less than the single lithium battery of setting discharge knee voltage difference threshold in latter stage.
Described discharge knee voltage in latter stage difference threshold is 1～100mV.
Described discharge knee voltage in latter stage difference threshold is 1～30mV.
A kind of energy storage lithium battery group is made up of a plurality of single lithium battery connection in series-parallel, it is characterized in that, static internal resistance of described single lithium battery and the static internal resistance difference of reference are less than the static internal resistance difference threshold of setting.
Described static internal resistance difference threshold is 10m Ω.
Described static internal resistance difference threshold is 5m Ω.
Described single lithium battery open circuit voltage with reference to the open circuit voltage difference, less than the open circuit voltage difference threshold value of setting.
Described open circuit voltage difference threshold value is 100mV.
Described open circuit voltage difference threshold value is 20mV.
Described single lithium battery capacity with reference to capacity difference, less than the capacity difference threshold value of setting.
Described capacity difference threshold value is 100mAh.
Described capacity difference threshold value is 20mAh.
Described single lithium battery efficiency for charge-discharge with reference to the efficiency for charge-discharge difference, less than the efficiency for charge-discharge difference threshold of setting.
Described efficiency for charge-discharge difference threshold is 10%.
Described efficiency for charge-discharge difference threshold is 3%.
The described single lithium battery discharge platform time with reference to the discharge platform time difference, less than the discharge platform time difference threshold value of setting.
Described battery discharge platform time difference threshold value is 10min.
Described battery discharge platform time difference threshold value is 3min.
Described single lithium battery discharge knee voltage in latter stage and reference discharge knee voltage difference in latter stage are less than discharge knee voltage in the latter stage difference threshold of setting.
Described electricity knee voltage difference threshold in latter stage is 100mV.
Described electricity knee voltage difference threshold in latter stage is 30mV.
The present invention has mainly solved the inconsistency of single lithium battery in the energy storage lithium battery group, makes it consistent relatively in certain allowed band.For the performance that promotes energy storage lithium battery group, improve efficiency for charge-discharge and prolongs standby time and recycle the life-span, strengthen the fail safe of energy storage lithium battery group, stability is significant, and technical solution of the present invention is practical, is convenient to operation.
Description of drawings
Fig. 1 is a portable computer portable power source system main circuit theory diagram;
The schematic equivalent circuit that Fig. 2 is connected by single lithium battery equivalent electric circuit series and parallel for energy storage lithium battery group;
Fig. 3 overcharges to the schematic diagram that influences of single lithium battery cycle life for a long time for single lithium battery;
The schematic flow sheet that Fig. 4 makes for energy storage lithium battery group of the present invention;
Fig. 5 is the influence schematic diagram of the voltage of energy storage lithium battery group to capacity;
Fig. 6 is a single lithium battery capacity schematic diagram;
Fig. 7 is certain model cylindrical battery discharge family of curves in latter stage of manufacturer;
Fig. 8 is 300 cycle charge-discharge capacity attenuation figure.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is described.
Main purpose of the present invention is the consistency that keeps the single lithium battery of composition energy storage lithium battery group.The consistency of single lithium battery is mainly reflected in the consistency of its capacity, the consistency of contained electric weight, the consistency of charging and discharging state etc.For realizing the consistency of single lithium battery in certain zone of reasonableness, we can pass through to measure following parameter, and guarantee that the difference between each parameter and the reference value achieves the goal in the reasonable scope.Wherein 2 parameters are the single lithium battery static parameter, open circuit voltage, static internal resistance when promptly stable state is opened a way; Other 4 parameters are the single lithium battery dynamic parameter, i.e. battery capacity, efficiency for charge-discharge, discharge platform time, discharge knee voltage in latter stage.
As shown in Figure 4, be schematic flow sheet of the present invention, as seen from the figure, the present invention mainly may further comprise the steps.
S1, internal resistances of a plurality of single lithium battery static state of calculating and the static internal resistance difference of reference obtain and the single lithium battery of the static internal resistance difference of reference less than the static internal resistance difference threshold of setting;
This step is calculated the static internal resistance and the static internal resistance difference of reference of each single lithium battery, and will calculate the static internal resistance difference of gained and compare with the static internal resistance difference threshold of setting, obtain static internal resistance difference those single lithium battery less than static internal resistance difference threshold.
The static internal resistance of the stable state of single lithium battery; consistency for single lithium battery is extremely important; as shown in Figure 2; the static internal resistance of single lithium battery 1 equals RL1+ESR1; when energy storage lithium battery group in charging time; the single lithium battery that internal resistance is high; its voltage can rise higher too; and when other single lithium battery are not full of electricity as yet fully; the voltage of the single lithium battery that internal resistance is high may reach the additives for overcharge protection voltage of portable power source system protection unit; so charging termination, and energy storage lithium battery group and being unrealized is full of fully, influences its stand-by time.
Here the setting of this internal resistance difference threshold can be 1～10m Ω.If the performance requirement height can be set to 1～5m Ω.
S2, calculate a plurality of single lithium battery open circuit voltages with reference to the open circuit voltage difference, obtain with reference to the open circuit voltage difference less than the single lithium battery of setting open circuit voltage difference threshold value.
This step is on the basis of step S1, calculate the open circuit voltage of each single lithium battery with reference to the open circuit voltage difference, and will calculate the open circuit voltage difference threshold of gained open circuit voltage difference and setting, obtain open circuit voltage difference those single lithium battery less than open circuit voltage difference threshold value.
In this step, this can be the nominal voltage of single lithium battery with reference to open circuit voltage, also can be for convenient for production, and the given voltage that grouping is used as single lithium battery can be decided according to actual conditions.The static internal resistance of description noted earlier, and the reference value of follow-up described single lithium battery capacity, efficiency for charge-discharge, discharge platform time, discharge knee voltage in latter stage also similarly are provided with, and no longer specify.
The stable state open circuit voltage of single lithium battery, be to influence the conforming important parameter of single lithium battery, as shown in Figure 5, the difference of single lithium battery open circuit voltage will cause the difference even the potential safety hazard of capacity, therefore being used for the open circuit voltage of single lithium battery of combo must be very approaching, the open circuit voltage of single lithium battery with must be in certain zone of reasonableness with reference to the open circuit voltage difference.
Here the setting of this open circuit voltage difference threshold value can be decided occurrence according to series-parallel group of number, can be set at 1～100mV such as open circuit voltage difference threshold value, if the performance requirement height can be set to 1～20mV.
S3, calculate a plurality of single lithium battery capacity with reference to capacity difference, obtain under certain multiplying power, with the reference capacity difference less than the single lithium battery of setting the capacity difference threshold value.
This step on the basis of step S2, calculate the capacity of each single lithium battery with reference to capacity difference, and will calculate the capacity difference threshold of gained capacity difference and setting, obtain capacity difference those single lithium battery less than the capacity difference threshold value.
The capacity of single lithium battery also is to influence the conforming direct factor of energy storage lithium battery group, and the single lithium battery that capacity is high can't completely be charged in the time of charging, and the single lithium battery that capacity is low then reaches shutoff voltage earlier in discharge.
Here the setting of this single lithium battery capacity difference threshold value can be 5～100mAh, if the performance requirement height can be set to 5～20mAh.
S4, calculate a plurality of single lithium battery efficiency for charge-discharges with reference to the efficiency for charge-discharge difference, obtain under certain multiplying power, with reference efficiency for charge-discharge difference less than the single lithium battery of setting the efficiency for charge-discharge difference threshold.
This step is on the basis of step S3, calculate the efficiency for charge-discharge of each single lithium battery with reference to the efficiency for charge-discharge difference, and will calculate gained efficiency for charge-discharge difference and compare with the efficiency for charge-discharge difference threshold of setting, obtain efficiency for charge-discharge difference those single lithium battery less than the efficiency for charge-discharge difference threshold.
The efficiency for charge-discharge of single lithium battery, promptly single lithium battery is emitted capacity and the percentage that charges into capacity.As shown in Figure 6, Zong some residual capacity can't utilize in the single lithium battery, and change with discharge rate and variation of temperature.Therefore have only when efficiency for charge-discharge is corresponding to, the single lithium battery of capacity unanimity just may be when discharging and recharging, and charging and discharging state is also consistent.
Here the setting of this efficiency for charge-discharge difference threshold can be 1～10%, if the performance requirement height can be set at 1～3%.
S5, calculate a plurality of single lithium battery discharge platform times with reference to the discharge platform time difference, obtain with reference to the discharge platform time difference less than the single lithium battery of setting discharge platform time difference threshold value.
This step is on the basis of step S4, calculate the discharge platform time of each single lithium battery with reference to the discharge platform time difference, and will calculate the discharge platform time difference threshold of gained discharge platform time difference and setting, obtain discharge platform time difference those single lithium battery less than discharge platform time difference threshold value.
The discharge platform time is meant the long-time very little that part of time of change of battery voltage in complete discharge process.When picking and placeing electricity usually, voltage is reduced to time about 3.6V when open circuit (static) from 4.2V, because of the single lithium battery nominal voltage different.The consistency of discharge platform time directly influences in the discharge process consistency of single lithium battery voltage.
Here the setting of this discharge platform time difference threshold value can be 1～10min, if the performance requirement height can be set to 1～3min.
S6, calculate a plurality of single lithium battery discharge knee voltages in latter stage with reference to discharge knee voltage difference in latter stage, obtain with reference to discharge knee voltage difference in latter stage less than the single lithium battery of setting discharge knee voltage difference threshold in latter stage.
This step is on the basis of step S5, calculate the discharge knee voltage in latter stage and reference discharge knee voltage difference in latter stage of each single lithium battery, and will calculate gained discharge knee voltage difference in latter stage and compare with discharge knee voltage in the latter stage difference threshold of setting, the latter stage knee voltage difference of obtaining discharging is less than those single lithium battery of the knee voltage difference threshold in latter stage of discharging.
Discharge knee voltage in latter stage as shown in Figure 7, Fig. 7 be the whole world certain well-known Battery Company 15 same batch certain model cylindrical lithium battery, discharge family of curves in the latter stage sectional drawing that standard is discharged under same environment.From Fig. 7 as can be seen, the discharge curve of 15 single lithium battery from 4.2V to the discharge about 3.35V about in, the match of 15 curves is almost consistent, and when lithium battery continuation discharge, when discharging into cut-ff voltage from about the 3.35V, voltage descends very fast, and 15 curves have had tangible dispersion.So usually, will be defined as discharge knee voltage in latter stage to this voltage of the quick drop point of voltage.Can find that from Fig. 7 even also there is the discrete phenomenon of discharge discharge curve in latter stage in the single lithium battery of global well-known manufacturer, knee voltage inconsistent causes the unbalanced of voltage, capacity inconsistent.Therefore but have only knee voltage consistent or come combo, just can promote the performance of energy storage lithium battery group, strengthen fail safe, the stability of energy storage lithium battery group at the battery of certain acceptance threshold.
The setting of the knee voltage difference threshold in latter stage of should discharging here can be 1～100mV, if the performance requirement height can be set to 1～30mV.
S7, with the single lithium battery that selects, according to single lithium battery quantitative requirement series and parallel combination, form energy storage lithium battery group.
This step according to the above-mentioned single lithium battery of selecting after the step of choosing, is carried out the series and parallel combination according to energy storage lithium battery group to the requirement of single lithium battery quantity on the basis of step S6, form energy storage lithium battery group.Having that the form of this series and parallel combination is common is following several:
3 strings 2 and combination, 3 strings 3 and combination, 4 strings 2 and combination etc. need to prove that this compound mode need require according to the parameter index of energy storage lithium battery group to decide, and can be not limited to above-mentioned compound mode.
In the solution of the present invention, can use simultaneously that above-mentioned steps S1---S6 carries out choosing of single lithium battery, also can only use some step wherein, specific embodiments is decided according to different demands.
Corresponding with the inventive method, energy storage lithium battery group of the present invention is made up of a plurality of single lithium battery connection in series-parallel, wherein:
Static internal resistance of this single lithium battery and the static internal resistance difference of reference are less than the static internal resistance difference threshold of setting;
This static state internal resistance difference threshold can be set to 10m Ω, if the performance requirement height can be set in the 5m Ω.
This single lithium battery open circuit voltage with reference to the open circuit voltage difference, less than the open circuit voltage difference threshold value of setting;
This open circuit voltage difference threshold value can be set to 100mV, if the performance requirement height can be set in the 20mV.
This single lithium battery capacity with reference to capacity difference, less than the capacity difference threshold value of setting;
This capacity difference threshold value can be set to 100mAh, if the performance requirement height can be set in the 20mAh.
This single lithium battery efficiency for charge-discharge with reference to the efficiency for charge-discharge difference, less than the efficiency for charge-discharge difference threshold of setting;
This efficiency for charge-discharge difference threshold can be set to 10%, if the performance requirement height can be set in 3%.
This single lithium battery discharge platform time with reference to the discharge platform time difference, less than the discharge platform time difference threshold value of setting;
This battery discharge platform time difference threshold value can be set to 10min, if the performance requirement height can be set in the 3min.
This single lithium battery discharge knee voltage in latter stage and reference discharge knee voltage difference in latter stage are less than discharge knee voltage in the latter stage difference threshold of setting.
This electricity knee voltage in latter stage difference threshold is 100mV, if the performance requirement height can be set in the 30mV.
Show according to theoretical research, the capacity of energy storage lithium battery group is followed the wooden barrel principle, it can emit amount of capacity, depend on the capacity that the minimum capacity single lithium battery is discharged, therefore the direct result that inconsistency caused of single lithium battery is exactly, some single lithium battery can be overcharged for a long time, and some single lithium battery can be by long-term overdischarge.Overcharge for a long time or the result of overdischarge then can directly influence useful life of energy-storage battery, energy storage lithium battery pool-size will speed up decay, and the single lithium battery that overcharges for a long time also may cause taking place serious accident.Along with the acceleration decay of energy storage lithium battery pool-size, also can reduce greatly useful life.
As shown in Figure 8, be several groups of embodiment of the present invention contrast schematic diagrames, after in this scheme each parameter of single lithium battery being screened, select the corresponding to single lithium battery of each parameter, be combined into energy storage lithium battery group.
1, selecting static parameter internal resistance and open circuit voltage is the combo parameter, guarantees the consistency of static internal resistance of single lithium battery and open circuit voltage, and improvement effect is comparatively obvious;
2, add capacity parameter on the basis of the above, guarantee the consistency of monomer lithium battery capacity, improvement effect further improves again;
If 3, introduce dynamic parameter discharge platform time, efficiency for charge-discharge, discharge knee voltage in latter stage value on the basis of the above again, guarantee the consistency of above-mentioned 3 dynamic parameters of single lithium battery, then improvement effect is the most obvious.
According to the correlation test data influence degree of above-mentioned 6 kinds of battery parameters to battery consistency is described below, we prove by 4 tests.
Table 1: scheme parameter combinations tabulation
| Test one | Test two | Test three | Test four |
| The same specification of same manufacturer is randomly drawed | The same specification of same manufacturer keeps consistency static internal resistance, open circuit voltage | The same specification of same manufacturer, static internal resistance, open circuit voltage, capacity keep consistency | The same specification of same manufacturer, static internal resistance, open circuit voltage, capacity efficiency for charge-discharge, discharge platform time, discharge knee voltage in latter stage keep consistency |
Test one: get 6 of same batch of single lithium battery at random, test its voltage, internal resistance and record.According to 3 strings 2 mode also, be combined into an energy storage lithium battery group at random then, insert in the constant normal temperature environment, according to 0.5C
5The A ratio discharges and recharges, and does 300 circulations.After the loop ends with 0.5C
5The constant current of A ratio was to energy storage lithium battery group charging 60 minutes.After the off-test, measure the single lithium battery voltage of each tandem in the energy storage lithium battery group, with measured voltage and the capacity record that circulates and emitted each time.
Test two: in same batch battery, choosing voltage measurement numerical value is more or less the same and differs less than 6 of the single lithium battery of 5m Ω in 10mV and internal resistance measurement numerical value, joining according to 3 strings 2 mode also is 1 group, according to test one described test method, this energy storage lithium battery group is done 300 circulations, after the off-test, measure the cell voltage of each tandem in the energy storage lithium battery group, with measured voltage and the capacity record that circulates and emitted each time.
Test three: in same batch battery, choosing voltage measurement numerical value is more or less the same in 10mV, internal resistance measurement numerical value differs the Ω less than 5m, simultaneously volume test numerical value differs less than 6 of the single lithium battery of 20mAh, according to 3 strings 2 and mode to join be 1 group, according to test one described test method, this energy storage lithium battery group is done 300 circulations, after the off-test, measure the single lithium battery voltage of each tandem in the energy storage lithium battery group, with measured voltage and the capacity record that circulates and emitted each time.
Test four: in same batch single lithium battery, on the basis of test three selection rules, require the efficiency for charge-discharge of single lithium battery to differ simultaneously less than 3%, in the discharge platform time phase difference 3 minutes, discharge knee voltage in latter stage differs less than 6 on the battery of 5mV, joining according to 3 strings 2 mode also is 1 group, according to test one described test method, this energy storage lithium battery group is done 300 circulations, after the off-test, measure the single lithium battery voltage of each tandem in the energy storage lithium battery group, with measured voltage and the capacity record that circulates and emitted each time.
According to shown in the table 1,4 kinds of different sorting combo modes are through the poor performance differnce accompanying drawing 7 that is showed after 300 circulations.
The different sorting combo of table 2:4 kind mode result of the test
| The test sequence number | Test one | Test two | Test three | Test four |
| Residual capacity % after 300 times | 37.1 | 64.3 | 71.6 | 88.2 |
Usually the cycle life that requires 3 string battery pack is for being not less than 300 times, and the capacity of being emitted when promptly recycling the 300th time is not less than 70% of nominal capacity.
Therefore to sum up, these 6 parameters are most important to the performance of battery, according to these 6 parameters, use the battery of certain regular sorting combo, can significantly promote portable power source stand-by time, recycle life-span, fail safe and stability etc.
The solution of the present invention increases substantially the fail safe and the stability of mobile accumulation power supply, and it is nearly 30% that the cycle life of energy storage lithium battery group is improved, and stand-by time obviously prolongs.
The technical program has mainly solved the inconsistency of the single lithium battery of energy storage lithium battery group in the portable power source system, makes it consistent relatively in certain allowed band.For the performance that promotes the portable power source system, improve energy storage lithium battery group efficiency for charge-discharge and prolongs standby time and recycle the life-span, strengthen the fail safe of portable power source system, stability is significant, and technical scheme is practical, is convenient to operation.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (36)
1, a kind of method for fabricating energy stored lithium battery pile is characterized in that, may further comprise the steps:
A, internal resistances of a plurality of single lithium battery static state of calculating and the static internal resistance difference of reference obtain and the single lithium battery of the static internal resistance difference of reference less than the static internal resistance difference threshold of setting;
B, with the single lithium battery that obtains in the abovementioned steps, according to single lithium battery quantitative requirement connection in series-parallel combination, form energy storage lithium battery group.
2, the method for claim 1 is characterized in that, described static internal resistance difference threshold is 1～10m Ω.
3, the method for claim 1 is characterized in that, described static internal resistance difference threshold is 1～5m Ω.
4, the method for claim 1 is characterized in that, also comprises step before the described step B:
B1, in the resulting a plurality of single lithium battery of abovementioned steps, calculate a plurality of single lithium battery open circuit voltages with reference to the open circuit voltage difference, obtain with reference to the open circuit voltage difference less than the single lithium battery of setting open circuit voltage difference threshold value.
5, method as claimed in claim 4 is characterized in that, described open circuit voltage difference threshold value is 1～100mV.
6, method as claimed in claim 4 is characterized in that, described open circuit voltage difference threshold value is 1～20mV.
7, method as claimed in claim 4 is characterized in that, also comprises step before the described step B:
B2, in the resulting a plurality of single lithium battery of abovementioned steps, calculate under a certain multiplying power of a plurality of single lithium battery capacity with reference to capacity difference, obtain with reference to capacity difference less than the single lithium battery of setting the capacity difference threshold value.
8, method as claimed in claim 7 is characterized in that, described battery capacity difference threshold is 5～100mAh.
9, method as claimed in claim 7 is characterized in that, described battery capacity difference threshold is 5～20mAh.
10, method as claimed in claim 7 is characterized in that, also comprises step before the described step B:
B3, in the resulting a plurality of single lithium battery of abovementioned steps, calculate under a certain multiplying power of a plurality of single lithium battery efficiency for charge-discharge with reference to the efficiency for charge-discharge difference, obtain with reference to the efficiency for charge-discharge difference less than the single lithium battery of setting the efficiency for charge-discharge difference threshold.
11, method as claimed in claim 10 is characterized in that, described efficiency for charge-discharge difference threshold is 1～10%.
12, method as claimed in claim 10 is characterized in that, described efficiency for charge-discharge difference threshold is 1～3%.
13, method as claimed in claim 10 is characterized in that, also comprises step before the described step B:
B4, in the resulting a plurality of single lithium battery of abovementioned steps, calculate a plurality of single lithium battery discharge platform times with reference to the discharge platform time difference, obtain with reference to the discharge platform time difference less than the single lithium battery of setting discharge platform time difference threshold value.
14, method as claimed in claim 13 is characterized in that, described discharge platform time difference threshold value is 1～10min.
15, method as claimed in claim 13 is characterized in that, described discharge platform time difference threshold value is 1～3min.
16, method as claimed in claim 13 is characterized in that, also comprises step before the described step B:
B5, in the resulting a plurality of single lithium battery of abovementioned steps, calculate a plurality of single lithium battery discharge knee voltages in latter stage with reference to discharge knee voltage difference in latter stage, obtain with reference to discharge knee voltage difference in latter stage less than the single lithium battery of setting discharge knee voltage difference threshold in latter stage.
17, method as claimed in claim 16 is characterized in that, described discharge knee voltage in latter stage difference threshold is 1～100mV.
18, method as claimed in claim 16 is characterized in that, described discharge knee voltage in latter stage difference threshold is 1～30mV.
19, a kind of energy storage lithium battery group is made up of a plurality of single lithium battery connection in series-parallel, it is characterized in that, static internal resistance of described single lithium battery and the static internal resistance difference of reference are less than the static internal resistance difference threshold of setting.
20, energy storage lithium battery group as claimed in claim 19 is characterized in that, described static internal resistance difference threshold is 10m Ω.
21, energy storage lithium battery group as claimed in claim 19 is characterized in that, described static internal resistance difference threshold is 5m Ω.
22, energy storage lithium battery group as claimed in claim 19 is characterized in that, described single lithium battery open circuit voltage with reference to the open circuit voltage difference, less than the open circuit voltage difference threshold value of setting.
23, energy storage lithium battery group as claimed in claim 22 is characterized in that, described open circuit voltage difference threshold value is 100mV.
24, energy storage lithium battery group as claimed in claim 22 is characterized in that, described open circuit voltage difference threshold value is 20mV.
25, energy storage lithium battery group as claimed in claim 22 is characterized in that, described single lithium battery capacity with reference to capacity difference, less than the capacity difference threshold value of setting.
26, energy storage lithium battery group as claimed in claim 25 is characterized in that, described capacity difference threshold value is 100mAh.
27, energy storage lithium battery group as claimed in claim 25 is characterized in that, described capacity difference threshold value is 20mAh.
28, energy storage lithium battery group as claimed in claim 25 is characterized in that, described single lithium battery efficiency for charge-discharge with reference to the efficiency for charge-discharge difference, less than the efficiency for charge-discharge difference threshold of setting.
29, energy storage lithium battery group as claimed in claim 28 is characterized in that, described efficiency for charge-discharge difference threshold is 10%.
30, energy storage lithium battery group as claimed in claim 28 is characterized in that, described efficiency for charge-discharge difference threshold is 3%.
31, energy storage lithium battery group as claimed in claim 28 is characterized in that, the described single lithium battery discharge platform time with reference to the discharge platform time difference, less than the discharge platform time difference threshold value of setting.
32, energy storage lithium battery group as claimed in claim 31 is characterized in that, described battery discharge platform time difference threshold value is 10min.
33, energy storage lithium battery group as claimed in claim 31 is characterized in that, described battery discharge platform time difference threshold value is 3min.
34, energy storage lithium battery group as claimed in claim 31 is characterized in that, described single lithium battery discharge knee voltage in latter stage and reference discharge knee voltage difference in latter stage are less than discharge knee voltage in the latter stage difference threshold of setting.
35, energy storage lithium battery group as claimed in claim 34 is characterized in that, described electricity knee voltage difference threshold in latter stage is 100mV.
36, energy storage lithium battery group as claimed in claim 34 is characterized in that, described electricity knee voltage difference threshold in latter stage is 30mV.
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| CN114361561A (en) * | 2021-12-31 | 2022-04-15 | 杭州鹏成新能源科技有限公司 | Novel battery pack grouping system capable of selecting combination and grouping method |
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| CN1229890C (en) * | 2002-12-18 | 2005-11-30 | 北京有色金属研究总院 | Method for scparating secodary cell |
| CN1585173A (en) * | 2004-06-16 | 2005-02-23 | 惠州Tcl金能电池有限公司 | Core series and parallel matching method for battery |
| CN100364168C (en) * | 2005-04-27 | 2008-01-23 | 韩伟 | Method for sorting batteries according to battery volt-ampere curve |
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| CN114361561A (en) * | 2021-12-31 | 2022-04-15 | 杭州鹏成新能源科技有限公司 | Novel battery pack grouping system capable of selecting combination and grouping method |
| CN114361561B (en) * | 2021-12-31 | 2024-03-19 | 杭州鹏成新能源科技有限公司 | Novel battery pack grouping system capable of being selectively combined and grouped and grouping method |
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