CN110729520B - Ternary battery rapid charging method - Google Patents
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- CN110729520B CN110729520B CN201910834950.7A CN201910834950A CN110729520B CN 110729520 B CN110729520 B CN 110729520B CN 201910834950 A CN201910834950 A CN 201910834950A CN 110729520 B CN110729520 B CN 110729520B
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- 238000007600 charging Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010277 constant-current charging Methods 0.000 claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 230000003247 decreasing effect Effects 0.000 claims abstract description 15
- 208000028659 discharge Diseases 0.000 claims description 38
- 230000010287 polarization Effects 0.000 claims description 13
- 238000010280 constant potential charging Methods 0.000 claims description 8
- 238000010281 constant-current constant-voltage charging Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004904 shortening Methods 0.000 abstract description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 7
- 229910001416 lithium ion Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000005457 optimization Methods 0.000 description 5
- 230000002441 reversible effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010278 pulse charging Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- PFYQFCKUASLJLL-UHFFFAOYSA-N [Co].[Ni].[Li] Chemical compound [Co].[Ni].[Li] PFYQFCKUASLJLL-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009831 deintercalation Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 229910000572 Lithium Nickel Cobalt Manganese Oxide (NCM) Inorganic materials 0.000 description 1
- HFCVPDYCRZVZDF-UHFFFAOYSA-N [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O Chemical compound [Li+].[Co+2].[Ni+2].[O-][Mn]([O-])(=O)=O HFCVPDYCRZVZDF-UHFFFAOYSA-N 0.000 description 1
- FBDMTTNVIIVBKI-UHFFFAOYSA-N [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] Chemical compound [O-2].[Mn+2].[Co+2].[Ni+2].[Li+] FBDMTTNVIIVBKI-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000007958 sleep Effects 0.000 description 1
- 230000004622 sleep time Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery quick charging method, which comprises the following steps: first, constant current charging is performed: for a battery which needs to be subjected to charge and discharge test before leaving a factory, constant-current charging is performed according to charging current with preset size until the charging capacity of the battery is equal to 40% -50% of SOC; second, constant voltage charge and discharge is performed: after constant current charging is completed, a plurality of pulse currents with decreasing sizes are adopted to continuously charge and discharge the battery at constant voltage, and the charging time of each pulse current is the same. The method for rapidly charging the battery can optimize the charging process of the battery in two stages of constant-current charging and constant-voltage charging respectively, achieves the effects of effectively shortening the overall charging time of the battery and improving the utilization rate of battery charging and discharging equipment, and has great practical significance.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery quick charging method.
Background
At present, in the production process of the cylindrical lithium ion battery, the steps of testing, grading and the like are required to be carried out on the battery, then the battery which is qualified in the test is subjected to subsequent packaging, and then the battery is shipped.
In the original operation mode, the battery needs to be subjected to processes such as assembly test before being packaged and shipped. The operation flow is as follows:
the battery is transferred to, the electricity is supplemented (namely, the charge and discharge test), the assembly test, the packaging and the final shipment.
From the above operation flow, it can be clearly seen that, during the operation process, when the ternary material battery (fully called: lithium ion secondary battery using ternary polymer such as nickel cobalt lithium manganate or nickel cobalt lithium aluminate as positive electrode material) is before assembly test, the battery needs to be charged, so as to ensure that the battery reaches the battery state of charge (SOC) required by the customer, and is generally controlled below 50% SOC. In general, the constant-current and constant-voltage charging at 0.5C is adopted to reach 40-50% of SOC, and the cut-off current of 50-100 mA is adopted as the end.
Considering the characteristics of a ternary material system, the voltage corresponding to 40% -50% SOC is in a voltage platform range, and the battery is charged for too long in a constant voltage stage, so that the utilization rate of battery charging and discharging equipment is low.
Therefore, a technology is urgently needed to be developed at present, and the charging process in the constant-current and constant-voltage stages can be optimized, so that the overall charging time of the battery is effectively shortened, and meanwhile, the utilization rate of battery charging and discharging equipment is improved.
Disclosure of Invention
The invention aims at overcoming the technical defects existing in the prior art and provides a battery quick charging method.
To this end, the invention provides a battery quick charge method comprising the steps of:
first, constant current charging is performed: for a battery which needs to be subjected to charge and discharge test before leaving a factory, constant-current charging is performed according to charging current with preset size until the charging capacity of the battery is equal to 40% -50% of SOC;
second, constant voltage charge and discharge is performed: after constant current charging is completed, a plurality of pulse currents with decreasing sizes are adopted to continuously charge and discharge the battery at constant voltage, and the charging time of each pulse current is the same.
In the first step, the charging time of the constant current charging stage is equal to t1;
the constant-current charging time t1 is 10-45 min.
In the first step, the charging current with preset magnitude is 0.5-1C.
In the second step, in the constant voltage charge and discharge stage, 3-5 pulse currents with decreasing sizes are sequentially adopted to charge and discharge the battery at constant voltage;
the pulse current in the second step is less than the charging current of the preset magnitude in the first step.
In the second step, the plurality of pulse currents are 0.4C charging current, 0.4C discharging current, 0.3C charging current, 0.3C discharging current, 0.2C charging current and 0.2C discharging current in sequence;
the time for each pulse of current was 1 minute.
Compared with the prior art, the invention provides a battery quick charging method, which can optimize the charging process of the battery in two stages of constant-current charging and constant-voltage charging respectively, thereby effectively shortening the overall charging time of the battery and improving the utilization rate of battery charging and discharging equipment.
Drawings
FIG. 1 is a flow chart of a method for improving the fast battery charging of the present invention;
fig. 2 is a schematic diagram of a voltage change of a battery with time when a ternary material battery is charged and discharged according to a specific embodiment of the present invention;
fig. 3 is a schematic diagram showing the voltage change of a battery with time when a conventional ternary material battery is charged and discharged before the present invention is applied.
FIG. 4 is a graph showing the relationship between the SOC and the battery voltage when the battery is discharged with a small current of 0.05C;
fig. 5 is a schematic diagram of the linear relationship between the voltage of the battery and time during the constant current phase.
Detailed Description
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the drawings and embodiments.
Referring to fig. 1 to 5, the present invention provides a battery fast charging method, specifically a fast charging method of a ternary material battery under a state of 50% soc, comprising the following steps:
first, constant current charging is performed: for a battery which needs to be subjected to charge and discharge test (i.e. power supply) before leaving a factory, constant-current charging is performed according to a charging current with a preset size until the charging capacity of the battery is equal to 40% -50% of SOC (i.e. equal to the sum of the original 0.5C constant-current constant-voltage charging electric quantity, see the background section);
second, constant voltage charge and discharge is performed: after constant current charging is completed, a plurality of pulse currents with decreasing sizes are adopted to continuously charge and discharge the battery at constant voltage, and the charging time of each pulse current is the same.
In the first step, in particular implementation, the charging time of the constant current charging stage is equal to t1;
it should be noted that, the constant current charging time t1 satisfies the following formula:
f (V) =3562+2.682×t1, where f (V) is the target voltage corresponding to the final required charge of 40-50% soc.
For the present invention, to obtain f (V), the specific procedure is: first, a corresponding curve between the voltage and the SOC of the battery is confirmed, and a curve in which discharge is performed with a small current of 0.05C is used as a reference, as shown in fig. 4. For example, if the battery needs to be charged to 40% -50% of SOC, the corresponding voltage is 3650-3700 mV according to the curve, the polarization effect of the battery during constant current charging is considered, voltage fallback occurs after the charging is finished, the upper limit of the charging voltage, namely the charging target is moved upwards, the range of the upwards movement is controlled within 5%, namely the range of 100-200 mV (namely the range of 100-200 mV is adjusted on the basis of 3650-3700 mV), the adjusting ranges of different systems are different, the adjustment can be performed according to the actual test result, and the situation that the voltage is still beyond the upper limit of the set charging target value after the voltage is reduced after the battery is polarized is avoided.
For the specific implementation of the invention, referring to fig. 2, when the initial constant current charging is carried out at 0.5C, namely, the constant current phase at the first stage, in the interval of 10-45 minutes, the voltage has a linear relation with time, corresponding voltage and time data are acquired through 3-5 times of test data, a linear equation is established according to the tools such as minitab software and the like as shown in table 1, and the slope DeltaV/Deltat, namely, the parameter value 2.682 can be fitted according to the simulation equation; 3562 is the intercept V0, i.e., the intersection of the curve (the scatter line) with the Y-axis in fig. 5.
Table 1:
| OCV mV | electric current mA | Time min | Capacity mAh | |
| 1 | 3585.5 | 1300 | 10 | 216.6 |
| 2 | 3616.6 | 1300 | 20 | 433.2 |
| 3 | 3638.9 | 1300 | 30 | 649.9 |
| 4 | 3663.5 | 1300 | 40 | 866.4 |
For the invention, t1 can be deduced according to the above formula during constant current charging, and f (V) =3562+2.682×t1, and t1 obtained at the same time can be verified in the reverse direction by the following two aspects and satisfies the following two limiting requirements: firstly, the t1 range preferably satisfies 10-45 minutes, secondly, the capacity corresponding to the t1 time of 0.5C constant-current charging is approximately equal to the capacity of the set target voltage of the SOC which is charged to 40-50% by using the original charging mode, namely, 0.5C constant-current constant-voltage charging
In the first step, the constant current charging time t1 is preferably 10 to 45 minutes.
In the first step, the charging current with a preset magnitude may be 0.5C to 1C (C is used to represent the multiplying power of the charging and discharging capability of the battery, and 1C represents the current intensity when the battery is fully discharged for one hour), preferably 0.5C.
In the first step, the voltage in the constant current charging stage is a high voltage f (V) in a specific implementation. As described above, the excess voltage is generally 100 to 200mV higher than the set target, specifically: that is, the adjustment range of 100 to 200mV is performed on the basis of 3650 to 3700mV, that is, the range is controlled to be within the proportion range of 5%, and the optimization can be performed by trial and error experiments or the like.
In the second step, in the constant voltage charge and discharge stage, preferably, 3-5 pulse currents with decreasing sizes are adopted in sequence to perform constant voltage charge and discharge on the battery;
the pulse current in the second step is less than the charging current of the preset magnitude in the first step. For example, the pulse current may be, in order, 0.4C charge current, 0.4C discharge current, 0.3C charge current, 0.3C discharge current, 0.2C charge current, 0.2C discharge current;
in particular, the time for each pulse of current may be 1 minute.
In the second step, in particular, in the constant voltage charge-discharge phase, the sum of the charge and discharge times of the plurality of pulse currents is equal to t2.
It should be noted that, for the present invention, 0.5C charging is adopted in the constant current stage, and polarization elimination is performed in the constant voltage stage by adopting a pulse decreasing manner, that is, a step decreasing is performed by current less than 0.5C, 0.4C charging is performed for 1 to 2 minutes, then 0.4C discharging is performed for 1 minute, and dormancy is performed for 1 minute; then a new round of pulses is performed using 0.3C; finally, pulse charge and discharge are carried out by using 0.2C. In the above process, the overall time t2 can be obviously calculated.
As described above, the time t2 is equal to the sum of the above 3 pulse charge and discharge times plus the intermediate sleep time, and in order to achieve better effect, the 3 inverted step pulses can be changed to n times, so as to improve the consistency between batteries.
In the present invention, the battery used is a ternary material battery, that is, a lithium ion secondary battery using a ternary polymer such as lithium nickel cobalt manganese oxide or lithium nickel cobalt aluminate as a positive electrode material.
It should be noted that, for the invention, the defects of the battery production field are mainly overcome, and the main constant-current stage charging time t1 and the constant-voltage stage charging and discharging time t2 in the power supplementing process are determined by redesigning the battery charging and discharging test flow and increasing the acquisition and analysis of key step data and combining the data fitting equation. In consideration of the fact that the battery is generally charged at a small current of 0.2C in the initial stage after assembly, and a relatively compact and stable solid electrolyte interface film (SEI film) is formed on the surface of an electrode material in the process, the process optimization test can be performed by using a large current of 0.5-1C in the subsequent power supply process. Respectively optimizing charging processes of constant-current charging and constant-voltage charging, wherein in the constant-current charging stage, high-voltage charging is performed by utilizing a battery polarization principle, corresponding constant-current charging time t1 is confirmed according to a data fitting equation fv (t), and meanwhile, the charging capacity of the corresponding constant-current stage is approximately equal to the sum of the constant-current constant-voltage charging capacities of the original 0.5C; in the constant voltage stage, the charge and discharge test is performed by adopting n decreasing pulse current modes, so that the battery polarization is eliminated, the most effective time efficiency principle is considered, the value of n is 3-5, the test requirement can be met, t2 is the sum of n decreasing pulse charging time, the overall charging time is effectively shortened, and the utilization rate of equipment is improved.
It should be noted that, for the charge and discharge test flow of the battery, the invention can adjust the current and voltage according to the batteries of different systems, so as to optimize the specific time of deducing parameters of t1, t2, etc. by using the simulation equation, and establish the final test flow.
After the invention is applied, the test flow of the battery is as follows, and the time of the power supply flow is effectively shortened without change before improvement:
the battery is transferred to, supplemented with electricity, assembled and tested, packaged and finally shipped.
Based on the technical scheme, the invention focuses on the rapid charging mode within the battery system platform range below 50% of SOC, carries out decomposition and optimization on constant-current charging and constant-voltage charging, and finally realizes rapid charging by utilizing the modes of battery polarization simulation deduction equation, reverse step pulse polarization elimination and the like.
It should be noted that, for the present invention, based on the original charging mode, the charging flow and the screening mode are redesigned according to the actual production requirement. In the original operation mode, the battery is charged in a direct constant-current constant-voltage charging mode, and the device utilization rate is low due to the fact that the charging time of the ternary system in the constant-voltage stage is too long.
According to the invention, by redesigning the battery charge and discharge test flow, the charge process optimization is respectively carried out in two stages of constant-current charge and constant-voltage charge, the high-voltage charge is carried out by utilizing the battery polarization principle in the constant-current charge stage, and the charge and discharge test is carried out in a decreasing pulse current mode in the constant-voltage stage, so that the battery polarization is eliminated, the overall charge time is effectively shortened, and the utilization rate of equipment is improved.
In order to more clearly understand the technical scheme of the present invention, the following specific embodiments, test procedures and explanations provided by the present invention are as follows with reference to fig. 2 and 3:
first, it should be noted that, in the constant current phase, the charging capacity of the battery decreases with an increase in current, because the larger the charging current is, the larger the battery polarization is, resulting in a decrease in charging efficiency and a decrease in charging capacity; while the charging capacity in the constant voltage phase increases with increasing current, because on the one hand the average current in the constant voltage charging phase increases and on the other hand the charging time also increases. In terms of average charging rate, the average charging rate in the constant voltage stage is smaller than the total average charging rate, so that the constant voltage charging stage is an important link affecting the charging speed of the battery, the charging efficiency in the constant current stage is improved, and the charging time in the constant voltage stage is shortened, which is the key point for improving the charging speed of the battery.
Considering that the battery is generally charged at a small current of 0.2C in the initial stage after assembly, and a relatively compact and stable solid electrolyte interface film (SEI film) is formed on the surface of an electrode material in the process, a large current of 0.5-1C can be used for flow optimization test in the subsequent power supply process. The discharge capacity of the battery is also improved along with the rise of the charge cut-off voltage, mainly because the charge and discharge process of the lithium ion battery, namely the deintercalation process of lithium ions, has more deintercalation of lithium ions and reversible lithium ions along with the rise of the charge cut-off voltage, so that the battery has better charge and discharge performance.
For the technical scheme of the invention, the charging process is optimized for the constant-current charging and the constant-voltage charging respectively, and if the charging current is considered to be larger in the constant-current charging stage, the battery can reach the set cut-off voltage earlier to enter the constant-voltage charging stage, but meanwhile, the battery polarization is serious due to the overlarge current, the charging time of the corresponding constant-voltage stage is increased, and particularly, the constant-voltage charging time of the battery system corresponding to the voltage platform range of the 40-50% SOC is increased more obviously. Therefore, in this stage, 0.5C constant current charging is preferentially selected, high voltage charging is performed by using the battery polarization principle, that is, the voltage of constant current charging is charged to be more than 40-50% of soc, constant current charging is stopped in time, corresponding constant current charging time t1 is confirmed according to a data fitting equation fv (t), f (V) =3562+2.682×t1, wherein f (V) is used as a final target voltage to be charged corresponding to 40-50% of soc, for the above first order equation, default is a linear equation when the final t1 takes a value in the range of 10-45 min, and the charging capacity of the corresponding constant current stage is approximately equal to the sum of the constant current constant voltage charging capacities of the original 0.5C (i.e., equal to 40-50% of soc); in the constant voltage stage, n decreasing pulse current modes are adopted to conduct charge and discharge tests so as to eliminate battery polarization. If the constant current value of 0.5C is used for pulse charge and discharge, the temperature rise of the battery is obvious, and the battery aging is accelerated along with the increase of the pulse amplitude, so that the constant voltage charging stage adopts the decreasing type reverse step pulse charging. Considering the principle of optimal time efficiency, the value of n is 3-5, the test requirement can be met, t2 is the sum of n pulse charging time with decreasing size, and the effect of effectively shortening the overall charging time and improving the utilization rate of equipment is finally achieved. See fig. 2 and 3.
For example, in a specific implementation, for a battery, a specific test procedure may be briefly described as follows:
1. first, the battery is dormant for 1 minute;
2. then, 0.5C constant current charging is performed for t1 minute;
3. then, the battery was dormant for 1 minute;
4. charging for 1 minute at constant current of 0.4C;
5. discharging for 1 minute at constant current of 0.4 ℃;
6. charging for 1 minute at constant current of 0.3 ℃;
7. discharging for 1 minute at constant current of 0.3 ℃;
8. charging for 1 minute at constant current of 0.2 ℃;
9. discharging for 1 minute at constant current of 0.2 ℃;
10. and continuing to sleep for 1 minute, and completing the charge and discharge (i.e. electricity supplementing) process of the battery.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, by redesigning the battery charge and discharge test flow, the charge and discharge time is effectively shortened on the basis of ensuring the consistency of the distribution voltage of the battery pack after power supply, and the equipment utilization rate is further improved. Meanwhile, the beat of the front and rear operation is balanced, the efficiency is maximized, the large-scale production is facilitated, and the application range is wide.
In summary, compared with the prior art, the battery rapid charging method provided by the invention can optimize the charging process of the battery in two stages of constant-current charging and constant-voltage charging respectively, thereby effectively shortening the overall charging time of the battery and improving the utilization rate of battery charging and discharging equipment.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. A method for rapidly charging a ternary battery, comprising the steps of:
first, constant current charging is performed: for a battery which needs to be subjected to charge and discharge test before leaving a factory, constant-current charging is performed according to charging current with a preset size;
in the first step, the voltage in the constant current charging stage is a high voltage f (V);
f（V）= V0+ΔV/Δt*t1；
wherein f (V) is used as a target voltage which corresponds to 40-50% of SOC and is finally required to be charged, t1 is constant current charging time, and DeltaV/Deltat is a slope; v0 is the intercept, i.e. the intersection point of the constant current charging curve and the vertical axis;
in the constant current charging process, a battery is charged with high voltage f (V) by utilizing a battery polarization principle, namely, the voltage of constant current charging is charged to be more than 40-50% of SOC, the constant current charging is stopped in time, and the corresponding constant current charging time is t1;
the constant-current charging curve is a curve obtained by performing constant-current charging on the battery by charging current with preset size, wherein the curve takes constant-current charging time as an abscissa and takes real-time voltage of the battery as an ordinate;
second, constant voltage charge and discharge is performed: after constant-current charging is completed, sequentially adopting a plurality of pulse currents with decreasing sizes, and continuously carrying out constant-voltage charging and discharging on the battery, wherein the charging time of each pulse current is the same;
the pulse current in the second step is less than the charging current of the preset magnitude in the first step.
2. The ternary battery rapid charging method of claim 1, wherein in the first step, the charging time of the constant current charging phase is equal to t1;
the constant-current charging time t1 is 10-45 min.
3. The method of claim 1, wherein the charging current of the predetermined magnitude is 0.5 to 1c in the first step.
4. The method for rapidly charging a ternary battery according to claim 1, wherein in the second step, 3 to 5 pulse currents with decreasing magnitudes are sequentially applied to charge and discharge the ternary battery at constant voltage in the constant voltage charge and discharge stage.
5. The method of fast charging a ternary battery according to claim 4, wherein in the second step, the plurality of pulse currents are in sequence 0.4C charge current, 0.4C discharge current, 0.3C charge current, 0.3C discharge current, 0.2C charge current, 0.2C discharge current;
the time for each pulse of current was 1 minute.
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| CN113991195A (en) * | 2020-05-19 | 2022-01-28 | 杭州铅锂智行科技有限公司 | Charger and charging method thereof |
| CN111934037B (en) * | 2020-07-14 | 2022-08-09 | 浙江零跑科技股份有限公司 | Battery charging method and computer readable storage medium |
| CN113611931A (en) * | 2021-08-05 | 2021-11-05 | 森克创能(天津)新能源科技有限公司 | Step charging method of zinc-nickel battery |
| CN113972411B (en) * | 2021-09-28 | 2023-04-07 | 天津力神电池股份有限公司 | Method for determining lithium battery quick-charging strategy |
| CN116491009A (en) * | 2021-11-23 | 2023-07-25 | 宁德时代新能源科技股份有限公司 | Secondary battery charging method and apparatus, computer storage medium, and electronic device |
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