CN117565748A - Lithium ion battery charging control method - Google Patents
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- 238000007600 charging Methods 0.000 title claims abstract description 252
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 120
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000178 monomer Substances 0.000 claims abstract description 40
- 230000006978 adaptation Effects 0.000 claims description 22
- 230000007613 environmental effect Effects 0.000 claims description 22
- 238000010277 constant-current charging Methods 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims description 8
- 238000010280 constant potential charging Methods 0.000 claims description 7
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 238000005457 optimization Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention provides a lithium ion battery charging control method, which comprises the steps of firstly measuring maximum allowable charging current meters of a target battery monomer at different temperatures and different SOCs, then measuring the charging current meters of the maximum charging efficiency of the target battery monomer at different temperatures, obtaining the maximum allowable charging current meters of the lithium ion battery at different temperatures and different SOCs and the charging current meters of the maximum charging efficiency of the lithium ion battery at different temperatures based on the parallel connection number of the target battery monomer in the lithium ion battery, and adjusting specific charging current values in real time according to the two charging current meters of the lithium ion battery when the lithium ion battery is charged at the target temperature, so as to realize the optimization of the charging efficiency.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery charging control method.
Background
Lithium ion batteries are widely used in electric vehicles as secondary rechargeable batteries due to their excellent characteristics such as high specific energy and long cycle life. The charging performance of the lithium ion battery is a key index of the whole electric automobile energy consumption, performance and cost. However, the charging efficiency is low, the low-temperature charging efficiency is fast reduced, the problem of low high-temperature charging protection limit and the like still exists, and the problem is a key factor affecting the whole vehicle performance and the use cost. Because the discharge performance of the lithium ion battery is better than the characteristic of the charging performance under the same use condition, improving the charging efficiency of the lithium ion battery is one of important ways for reducing the charging energy consumption, improving the charging performance and reducing the use cost.
At present, a method for optimizing the charging efficiency of a lithium ion battery is mainly focused on the aspects of optimizing the charging mode of a power battery system and modifying the materials of battery monomers. However, by optimizing the method of the battery system charging mode, the optimization process is time-consuming and has a large number of influencing variables, and can be optimized only for the charging method under a single battery system. The method for modifying the materials in the battery monomer changes the type or model of the battery monomer, and breaks away from the use condition of the battery monomer, so that the optimization effect is poor.
Disclosure of Invention
In order to solve the above problems, the present invention provides a lithium ion battery charging control method.
A lithium ion battery charging control method comprises the following steps:
according to the allowable temperature interval of a target battery monomer in the lithium ion battery, Y target temperatures are obtained, and the 0-A% SOC interval is split to obtain X SOC points, wherein A is more than 0 and less than 100, and SOC represents the state of charge of the battery;
for any target temperature, placing a target battery cell at the target temperature for environmental adaptation, then adjusting the charging current of the target battery cell, and testing to obtain the maximum allowable charging current of the target battery cell at the target temperature, wherein the maximum allowable charging current of the anode surface without lithium precipitation is obtained in the process that the target battery cell is charged to a 100% SOC value from the SOC value corresponding to any one of the X SOC points, so as to obtain the maximum allowable charging current meter of the target battery cell at different temperatures and different SOCs;
the method comprises the steps of putting a target battery monomer at a target temperature for environmental adaptation, then selecting current constant-current charging, converting to constant-voltage charging after reaching a battery charging cut-off voltage, stopping charging when the charging current is reduced to the target current, and recording charging energy;
the method comprises the steps of placing a target battery cell at a target temperature for environmental adaptation, then simulating an actual vehicle operation condition, discharging the target battery cell to a minimum termination voltage specified by the target battery cell by using current of the actual vehicle operation condition, and recording discharge energy;
according to the charging energy and the discharging energy, calculating the charging efficiencies of the target battery cells corresponding to different charging currents at the target temperature, and obtaining the maximum charging efficiency of the target battery cells, thereby obtaining a charging ammeter with the maximum charging efficiency of the target battery cells at different temperatures;
based on the maximum allowable charging ammeter of the target battery monomer at different temperatures and different SOCs, the charging ammeter of the target battery monomer at the maximum charging efficiency at different temperatures and the parallel number of the target battery monomer in the lithium ion battery, calculating to obtain the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs and the charging ammeter of the lithium ion battery at the maximum charging efficiency at different temperatures;
when the lithium ion battery is charged at the target temperature, a first current value I is obtained according to a maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs f Obtaining a second current value I according to a charging ammeter with maximum charging efficiency of the lithium ion battery at different temperatures s ；
If I f ≥I s Then adopt I s Charging the lithium ion battery by using the current with the magnitude;
if I f ＜I s Then adopt I f The lithium ion battery is charged by the current with the magnitude.
According to the lithium ion battery charging control method provided by the invention, firstly, the maximum allowable charging ammeter of the target battery monomer at different temperatures and different SOCs is measured, then, the charging ammeter of the target battery monomer at different temperatures and the maximum allowable charging ammeter of the lithium ion battery at different SOCs and the charging ammeter of the lithium ion battery at different temperatures are obtained based on the parallel number of the target battery monomer in the lithium ion battery, and when the lithium ion battery is charged at the target temperature, specific charging current values are adjusted in real time according to the two charging ammeters of the lithium ion battery, so that the optimization of the charging efficiency is realized.
In addition, the lithium ion battery charging control method provided by the invention has the following technical characteristics:
further, in the step of calculating the charging efficiency of the target battery cell corresponding to different charging currents at the target temperature according to the charging energy and the discharging energy, the following formula is adopted to calculate the charging efficiency of the target battery cell:
wherein,indicating the charging efficiency of the target battery cell corresponding to the ith charging current at the target temperature, E cha Represents charging energy, E dch Representing discharge energy.
Further, the maximum target cell charging efficiency satisfies the following conditional expression:
wherein,indicating the maximum target cell charge efficiency at the target temperature,/->、/>The charging efficiencies of the target battery cells corresponding to the 1 st charging current and the n-th charging current at the target temperature are respectively shown.
Further, based on a maximum allowable charging ammeter of a target battery monomer at different temperatures and different SOCs, a charging ammeter of maximum charging efficiency of the target battery monomer at different temperatures, and the parallel number of the target battery monomer in the lithium ion battery, the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs, and the charging ammeter of maximum charging efficiency of the lithium ion battery at different temperatures are obtained by calculation, which specifically comprises:
multiplying the current value in the maximum allowable charging ammeter of the target battery cell at different temperatures and different SOCs by the parallel number of the target battery cell in the lithium ion battery to obtain the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs;
and multiplying the current in the charging ammeter of the maximum charging efficiency of the target battery cell at different temperatures by the parallel number of the target battery cell in the lithium ion battery to obtain the charging ammeter of the maximum charging efficiency of the lithium ion battery at different temperatures.
Further, the method further comprises:
the target battery cell is placed at the target temperature for environmental adaptation, and then the charging current I of the target battery cell with the maximum charging efficiency is carried out x Constant current charging is carried out until the battery charging cut-off voltage is reached, the time T and the first charging capacity C are recorded 1 ；
The lithium ion battery is placed at the target temperature for environmental adaptation, and then the lithium ion battery is charged at the same charging current I x Constant current charging is carried out, the charging time is T, and the second charging capacity C is recorded 2 ；
Calculating the correction coefficient of the lithium ion battery at the target temperaturea，a=C 2 /mC 1 M represents a target battery cell in a lithium ion batteryThen based on the correction factor of the lithium ion batteryaAnd correcting the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs and the charging ammeter of the lithium ion battery with maximum charging efficiency at different temperatures.
Further, the target current is 0.05I 1 Wherein I 1 Is the target cell 1 hour discharge rate current.
Drawings
Fig. 1 is a flowchart of a method for controlling charging of a lithium ion battery according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of the invention provides a lithium ion battery charging control method, which includes the following steps S1 to S9:
s1, according to a temperature interval of a target battery monomer in a lithium ion battery, which is allowed to be used, Y target temperatures are obtained, and a 0-A% SOC interval is split to obtain X SOC points, wherein A is more than 0 and less than 100.
In this embodiment, a 53Ah target battery cell is taken as an example for illustration, the allowable temperature interval of the target battery cell is 0 ℃ to 45 ℃, 1 target temperature is selected every 5 ℃ to obtain y=10 target temperatures, which are respectively: 0 ℃,5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃, 40 ℃, 45 ℃.
The SOC (State of Charge) represents a State of Charge of the battery, and is also called a remaining Charge.
In this example, a takes 99 and x takes 15, i.e. the interval of 0-99% SOC is split to obtain 15 SOC points, and these 15 SOC points are respectively 0, 3% SOC, 5% SOC, 10% SOC, 20% SOC, 30% SOC, 40% SOC, 50% SOC, 60% SOC, 70% SOC, 80% SOC, 90% SOC, 95% SOC, 98% SOC, and 99% SOC.
S2, for any target temperature, placing the target battery cell at the target temperature for environmental adaptation, then adjusting the charging current of the target battery cell, and testing to obtain the maximum allowable charging current of the target battery cell at the target temperature, wherein the maximum allowable charging current of the anode surface without lithium precipitation is obtained in the process that the target battery cell is charged to the 100% SOC value from the SOC value corresponding to any one of the X SOC points, so as to obtain the maximum allowable charging current meter of the target battery cell at different temperatures and different SOCs.
In this embodiment, the target temperature is illustrated by taking 0 ℃ as an example, and before the test, the target battery cell needs to be placed at 0 ℃ for environmental adaptation, specifically, the following steps are performed:
firstly, standing a target battery monomer for 3 hours at 25 ℃ and then performing 1/3I 1 Constant current charging, wherein I 1 The target battery cell is charged to 4.35V and then is charged at constant voltage until the charging current is reduced to 0.05I after 1 hour of discharge rate current 1 The charging is stopped.
Then the target battery cell is stood for 6 hours at the target temperature of 0 ℃ and then the temperature is 1/3I 1 Discharge to cut-off voltage, record discharge capacity as 50.85Ah.
Then the target battery monomer is kept stand for 3 hours at 25 ℃ and then is pressed according to 1/3I 1 Constant current charging, charging to 4.35V, converting to constant voltage charging, and reducing charging current to 0.05I 1 The charging is stopped.
Finally, standing the target battery monomer at the target temperature of 0 ℃ for 6 hours, and completing the environmental adaptation of the target battery monomer at the target temperature (namely 0 ℃), through the above processes.
In this embodiment, after the environmental adaptation of the target battery cell at the target temperature is completed, the battery cell is subjected to a temperature of 1/3I 1 The discharge was adjusted to a target SOC value (the target SOC value corresponds to any SOC point selected from the X SOC points, for example, the target SOC value is 95% SOC value) based on the capacity 50.85Ah, and the adjustment time was 9min. The charging current is then adjusted so that,
testing to obtain maximum allowable charging current of the anode surface without lithium precipitation, namely anode potential relative to Li/Li, in the process of charging the target battery cell from 95% SOC value to 100% SOC value at target temperature (namely 0 ℃) + The potential cannot be lower than the maximum charging current of 0V, so that the maximum allowable charging current of the target battery cell at 0 ℃ and 95% SOC value is obtained.
And then according to the same steps, the maximum allowable charging current of the target battery monomer at different temperatures and different SOCs can be obtained by switching the target temperature and the target SOC value, and the maximum allowable charging currents form a maximum allowable charging current meter of the target battery monomer at different temperatures and different SOCs, and the maximum allowable charging current meter of the target battery monomer at different temperatures and different SOCs is shown in a table 1.
TABLE 1 maximum allowable charging Current Meter (Unit: A) for target Battery cells at different temperatures and different SOCs
And S3, placing the target battery cell at a target temperature for environmental adaptation, then selecting current constant current charging, converting to constant voltage charging after reaching the battery charging cut-off voltage, stopping charging when the charging current is reduced to the target current, and recording the charging energy.
Preferably, the target current is 0.05I 1 Wherein I 1 Is the target cell 1 hour discharge rate current.
In step S3, the operation of placing the target battery cell at the target temperature for environmental adaptation is the same as in step S2.
After the target battery cell is environmentally adapted at the target temperature, current constant-current charging (e.g. 1I 1 、0.5I 1 、0.3I 1 Etc.) constant current charging, reaching the battery charging cut-off voltage of 4.35V, then converting to constant voltage charging, cutting-off current 0.05I1, recording charging energy E cha 。
And S4, placing the target battery cell at a target temperature for environmental adaptation, then simulating the running working condition of the real vehicle, discharging the target battery cell to the minimum termination voltage specified by the target battery cell by using the current of the running working condition of the real vehicle, and recording the discharge energy.
In step S4, the operation of placing the target battery cell at the target temperature for environmental adaptation is the same as in step S2.
After the environment of the target battery monomer is adapted at the target temperature, the actual vehicle running working condition is simulated, the target battery monomer is discharged to the minimum termination voltage regulated by the target battery monomer by the current of the actual vehicle running working condition, and the discharge energy E is recorded dch 。
And S5, calculating the charging efficiency of the target battery cell corresponding to different charging currents at the target temperature according to the charging energy and the discharging energy, obtaining the maximum charging efficiency of the target battery cell, and further obtaining a charging ammeter of the maximum charging efficiency of the target battery cell at different temperatures.
The charging efficiency of the target battery monomer is calculated by adopting the following formula:
wherein,indicating the charging efficiency of the target battery cell corresponding to the ith charging current at the target temperature, E cha Represents charging energy, E dch Representing discharge energy.
The maximum target cell charging efficiency satisfies the following conditional expression:
wherein,indicating the maximum target cell charge efficiency at the target temperature,/->、/>Respectively represent the 1 st charging current (1 st charging current is, for example, 0.1I) 1 ) An nth charging current (the nth charging current is 1I for example) 1 ) And the corresponding target battery cell charging efficiency.
And then, according to the same steps, switching the target temperature to obtain the charging current of the maximum charging efficiency of the target battery monomer at different temperatures, and further obtaining the charging ammeter of the maximum charging efficiency of the target battery monomer at different temperatures.
The charging current table of the maximum charging efficiency of the target battery cell obtained in this example at different temperatures is shown in table 2.
Table 2 charging ammeter for maximum charging efficiency of target battery cell at different temperatures
S6, calculating to obtain the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs and the charging ammeter of the lithium ion battery at different temperatures based on the maximum allowable charging ammeter of the target battery at different SOCs, the charging ammeter of the maximum charging efficiency of the target battery at different temperatures and the parallel number of the target battery in the lithium ion battery.
Specifically, multiplying the current value in the maximum allowable charging ammeter of the target battery cell at different temperatures and different SOCs by the parallel number of the target battery cell in the lithium ion battery to obtain the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs;
and multiplying the current in the charging ammeter of the maximum charging efficiency of the target battery cell at different temperatures by the parallel number of the target battery cell in the lithium ion battery to obtain the charging ammeter of the maximum charging efficiency of the lithium ion battery at different temperatures.
In this embodiment, the number of parallel connection of the target battery cells in the lithium ion battery is 3, so the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs and the charging ammeter of the lithium ion battery at different temperatures with maximum charging efficiency can be obtained by multiplying the current values in tables 1 and 2 by 3.
Specifically, the maximum allowable charging current table of the lithium ion battery at different temperatures and different SOCs is shown in table 3.
TABLE 3 maximum allowable charging Current Meter (Unit: A) for lithium ion batteries at different temperatures and different SOCs
Table 4 charging ammeter for maximum charging efficiency of lithium ion battery at different temperatures
S7, when the lithium ion battery is charged at the target temperature, obtaining a first current value I according to a maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs f Obtaining a second current value I according to a charging ammeter with maximum charging efficiency of the lithium ion battery at different temperatures s 。
S8, if I f ≥I s Then adopt I s The lithium ion battery is charged by the current with the magnitude.
S9, if I f ＜I s Then adopt I f The lithium ion battery is charged by the current with the magnitude.
For example, when the lithium ion battery is charged at 0 ℃, when charged to 20% soc value, a first current value I is obtained according to table 3 f 24A, a second current value I is obtained according to Table 4 s 159A, due to I f ＜I s And charging the lithium ion battery by adopting a current with the size of 24A.
It should be noted that, in the implementation, the SOC value of the lithium ion battery is gradually increased, and if the current SOC value of the lithium ion battery is not the SOC value in table 3, the maximum value of the corresponding current values of the SOC values at the two ends of the SOC value interval may be selected according to the SOC value interval corresponding to the current SOC value. For example, at 0deg.C, when the lithium ion battery is charged to 51% SOC value, it may be determined that the 51% SOC value is at [50% SOC value, 60% SOC value]In this section, the two end point SOC value of this section is 50% SOC value and 60% SOC value, in table 3, the current value corresponding to 50% SOC value is 24a, the current value corresponding to 60% SOC value is 9A, and the current value corresponding to 50% SOC value is larger than the two, so when the lithium ion battery is charged at 0 ℃, when the lithium ion battery is charged to 51% SOC value, the first current value I is obtained from table 3 f 24A.
Furthermore, as a specific example, the method further includes:
the target battery cell is placed at the target temperature for environmental adaptation, and then the charging current I of the target battery cell with the maximum charging efficiency is carried out x Constant current charging is carried out until the battery charging cut-off voltage is reached, the time T and the first charging capacity C are recorded 1 ；
The lithium ion battery is placed at the target temperature for environmental adaptation, and then the lithium ion battery is charged at the same charging current I x Constant current charging is carried out, the charging time is T, and the second charging capacity C is recorded 2 ；
Calculating the correction coefficient of the lithium ion battery at the target temperaturea，a=C 2 /mC 1 M represents the parallel number of target battery cells in the lithium ion battery, and then is based on the correction coefficient of the lithium ion batteryaAnd correcting the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs and the charging ammeter of the lithium ion battery with maximum charging efficiency at different temperatures.
For example, the target battery cell is subjected to environmental adaptation at a target temperature of 0 ℃ and then subjected to the following conditions of 1/3I 1 Constant current charging, charging to 4.35V, converting to constant voltage charging, and reducing charging current to 0.05I 1 Stopping charging at the time, recording the first charging capacity C 1 50.84Ah;
the lithium ion battery is placed at the target temperature of 0 ℃ for environmental adaptation, and then the lithium ion battery is subjected to the following conditions of 1/3I 1 Constant current charging, namely converting the highest single battery voltage to the battery charging cut-off voltage of 4.35V to constant voltage charging until the charging current is reduced to 0.05I 1 Stopping charging at the time, recording the second charging capacity C 2 149.33Ah. In this embodiment, m is 3.
Correction coefficient of lithium ion battery at target temperature of 0deg.Ca=C 2 /mC 1 =0.979。
And then multiplying the current values in the table 3 and the table 4 by 0.979 to obtain a maximum allowable charging ammeter of the corrected lithium ion battery at different temperatures and different SOCs and a charging ammeter of the corrected lithium ion battery at different temperatures and having maximum charging efficiency, and performing the operations of the steps S7 to S9 based on the two corrected ammeters. By correction, the charging energy efficiency can be further improved under the condition that the total charging time is slightly increased.
In summary, according to the lithium ion battery charging control method provided by the embodiment, firstly, the maximum allowable charging ammeter of the target battery monomer at different temperatures and different SOCs is measured, then, the charging ammeter of the maximum charging efficiency of the target battery monomer at different temperatures is measured, and then, based on the parallel number of the target battery monomer in the lithium ion battery, the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs and the charging ammeter of the lithium ion battery at different temperatures are obtained.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. The lithium ion battery charging control method is characterized by comprising the following steps:
according to the allowable temperature interval of a target battery monomer in the lithium ion battery, Y target temperatures are obtained, and the 0-A% SOC interval is split to obtain X SOC points, wherein A is more than 0 and less than 100, and SOC represents the state of charge of the battery;
for any target temperature, placing a target battery cell at the target temperature for environmental adaptation, then adjusting the charging current of the target battery cell, and testing to obtain the maximum allowable charging current of the target battery cell at the target temperature, wherein the maximum allowable charging current of the anode surface without lithium precipitation is obtained in the process that the target battery cell is charged to a 100% SOC value from the SOC value corresponding to any one of the X SOC points, so as to obtain the maximum allowable charging current meter of the target battery cell at different temperatures and different SOCs;
the method comprises the steps of putting a target battery monomer at a target temperature for environmental adaptation, then selecting current constant-current charging, converting to constant-voltage charging after reaching a battery charging cut-off voltage, stopping charging when the charging current is reduced to the target current, and recording charging energy;
the method comprises the steps of placing a target battery cell at a target temperature for environmental adaptation, then simulating an actual vehicle operation condition, discharging the target battery cell to a minimum termination voltage specified by the target battery cell by using current of the actual vehicle operation condition, and recording discharge energy;
according to the charging energy and the discharging energy, calculating the charging efficiencies of the target battery cells corresponding to different charging currents at the target temperature, and obtaining the maximum charging efficiency of the target battery cells, thereby obtaining a charging ammeter with the maximum charging efficiency of the target battery cells at different temperatures;
based on the maximum allowable charging ammeter of the target battery monomer at different temperatures and different SOCs, the charging ammeter of the target battery monomer at the maximum charging efficiency at different temperatures and the parallel number of the target battery monomer in the lithium ion battery, calculating to obtain the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs and the charging ammeter of the lithium ion battery at the maximum charging efficiency at different temperatures;
when the lithium ion battery is charged at the target temperature, a first current value I is obtained according to a maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs f Obtaining a second current value I according to a charging ammeter with maximum charging efficiency of the lithium ion battery at different temperatures s ；
If I f ≥I s Then adopt I s Charging the lithium ion battery by using the current with the magnitude;
if I f ＜I s Then adopt I f The lithium ion battery is charged by the current with the magnitude.
2. The method according to claim 1, wherein in the step of calculating the target battery cell charging efficiency corresponding to different charging currents at the target temperature according to the charging energy and the discharging energy, the target battery cell charging efficiency is calculated using the following formula:
wherein,indicating the charging of the target battery cell corresponding to the ith charging current at the target temperatureEfficiency, E cha Represents charging energy, E dch Representing discharge energy.
3. The lithium ion battery charge control method according to claim 2, wherein the maximum target cell charge efficiency satisfies the following conditional expression:
wherein,indicating the maximum target cell charge efficiency at the target temperature,/->、/>The charging efficiencies of the target battery cells corresponding to the 1 st charging current and the n-th charging current at the target temperature are respectively shown.
4. The method for controlling charging of a lithium ion battery according to claim 1, wherein the maximum allowable charging current meter of the lithium ion battery at different temperatures and different SOCs and the charging current meter of the lithium ion battery at different temperatures and the maximum allowable charging current meter of the lithium ion battery at different SOCs are calculated based on the maximum allowable charging current meter of the target battery at different temperatures and the maximum charging efficiency of the target battery at different temperatures, and the parallel number of the target battery in the lithium ion battery specifically comprises:
multiplying the current value in the maximum allowable charging ammeter of the target battery cell at different temperatures and different SOCs by the parallel number of the target battery cell in the lithium ion battery to obtain the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs;
and multiplying the current in the charging ammeter of the maximum charging efficiency of the target battery cell at different temperatures by the parallel number of the target battery cell in the lithium ion battery to obtain the charging ammeter of the maximum charging efficiency of the lithium ion battery at different temperatures.
5. The lithium ion battery charge control method according to claim 1, characterized in that the method further comprises:
the target battery cell is placed at the target temperature for environmental adaptation, and then the charging current I of the target battery cell with the maximum charging efficiency is carried out x Constant current charging is carried out until the battery charging cut-off voltage is reached, the time T and the first charging capacity C are recorded 1 ；
The lithium ion battery is placed at the target temperature for environmental adaptation, and then the lithium ion battery is charged at the same charging current I x Constant current charging is carried out, the charging time is T, and the second charging capacity C is recorded 2 ；
Calculating the correction coefficient of the lithium ion battery at the target temperaturea，a=C 2 /mC 1 M represents the parallel number of target battery cells in the lithium ion battery, and then is based on the correction coefficient of the lithium ion batteryaAnd correcting the maximum allowable charging ammeter of the lithium ion battery at different temperatures and different SOCs and the charging ammeter of the lithium ion battery with maximum charging efficiency at different temperatures.
6. The lithium ion battery charge control method according to claim 1, wherein the target current is 0.05I 1 Wherein I 1 Is the target cell 1 hour discharge rate current.
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