CN116865388A - Method and device for formulating quick charge strategy and electronic equipment - Google Patents
Method and device for formulating quick charge strategy and electronic equipment Download PDFInfo
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- CN116865388A CN116865388A CN202310814680.XA CN202310814680A CN116865388A CN 116865388 A CN116865388 A CN 116865388A CN 202310814680 A CN202310814680 A CN 202310814680A CN 116865388 A CN116865388 A CN 116865388A
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- 238000000034 method Methods 0.000 title claims abstract description 87
- 238000012360 testing method Methods 0.000 claims abstract description 173
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 21
- 229910052744 lithium Inorganic materials 0.000 claims description 21
- 238000001556 precipitation Methods 0.000 claims description 13
- 238000004590 computer program Methods 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 abstract description 19
- 238000009472 formulation Methods 0.000 abstract description 16
- 238000007405 data analysis Methods 0.000 abstract description 12
- 230000000875 corresponding effect Effects 0.000 description 80
- 238000007747 plating Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
- H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/30—Constructional details of charging stations
- B60L53/32—Constructional details of charging stations by charging in short intervals along the itinerary, e.g. during short stops
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- 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
Abstract
The invention discloses a method and a device for formulating a quick charge strategy and electronic equipment. In the method, the internal resistance of the battery to be tested is tested on the basis of a first charging strategy determined by a three-electrode method. And determining the internal resistance increase rate of the battery to be tested in the first cut-off state of charge at different test temperatures relative to the preset temperature according to the internal resistance test. And determining a second charging strategy of the battery to be tested at different test temperatures according to the internal resistance increasing rate of the battery to be tested at the test temperature, the first cut-off charge state corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off charge state. According to the method, based on the charging strategy at the preset temperature and the test data of the internal resistance test, the charging strategies at other temperatures are determined through the relation between data analysis and data, so that the use of a three-electrode method at different temperatures is avoided, the accuracy of strategy formulation is improved, the speed of data analysis is higher, and the efficiency of strategy formulation is improved.
Description
Technical Field
The embodiment of the invention relates to an energy storage battery technology, in particular to a method and a device for formulating a quick charge strategy and electronic equipment.
Background
With the use of energy storage batteries in vehicles such as vehicles and ships, rapid charging of energy storage batteries has become a hot issue.
The existing fast charge strategy of the lithium ion battery mainly uses a three-electrode method, and a reference electrode is implanted in the middle of the electrode slice. And ensuring that the potential of the negative electrode is higher than the lithium precipitation potential in the charging process, so as to determine the upper limit of the charge state of charging by using different multiplying powers.
However, the lithium plating layer of the reference electrode is unstable at low temperature, the upper limit of the charge state of the strategy by adopting the three-electrode method at different temperatures is adopted, the obtained strategy has poor accuracy, and a large number of experiments lead to lower strategy formulation efficiency.
Disclosure of Invention
The invention provides a method and a device for formulating a quick charge strategy and electronic equipment, so as to improve the accuracy and efficiency of strategy formulation.
In a first aspect, an embodiment of the present invention provides a method for setting a fast charging policy, where the method for setting a fast charging policy includes:
determining a first charging strategy of a battery to be tested at a preset temperature by adopting a three-electrode method, wherein the first charging strategy comprises a preset multiplying power and a first cut-off charge state corresponding to the preset multiplying power;
determining the internal resistance increase rate of the battery to be tested under the condition that the state of charge is the first cut-off state of charge at different test temperatures relative to the preset temperature according to an internal resistance test;
and determining a second charging strategy of the battery to be tested at different test temperatures according to the internal resistance increasing rate of the battery to be tested at the test temperatures, the first cut-off state of charge corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off state of charge, wherein the second charging strategy comprises the preset multiplying power and a second cut-off state of charge corresponding to the preset multiplying power.
Optionally, determining a first charging strategy of the battery to be tested at a preset temperature by using a three-electrode method includes:
at the preset temperature, respectively carrying out charging operations with different preset multiplying powers on the battery to be tested by adopting the three-electrode method;
detecting the negative electrode potential of the battery to be detected in the charging operation process;
when the negative electrode potential reaches a lithium precipitation potential, determining the real-time charge state of the battery to be detected as the first cut-off charge state corresponding to the preset multiplying power;
and determining the first charging strategy of the battery to be tested at the preset temperature according to the preset multiplying power and the corresponding first cut-off state of charge.
Optionally, the internal resistance test includes a hybrid power pulse characteristic test;
according to the internal resistance test, determining the internal resistance increase rate of the battery to be tested under the condition that the state of charge is the first cut-off state of charge at different test temperatures relative to the preset temperature, including:
according to test data obtained by the mixed power pulse characteristic test, determining internal resistance values of the battery to be tested at the preset temperature and different test temperatures respectively under the condition that the state of charge is the first cut-off state of charge;
calculating the internal resistance difference value of the battery to be tested at the test temperature and the preset temperature under the condition that the state of charge is the first cut-off state of charge;
and determining the internal resistance increase rate of the battery to be tested, the state of charge of which is the first cut-off state of charge at the test temperature, according to the ratio of the internal resistance difference value to the internal resistance value of the battery to be tested at the preset temperature at the first cut-off state of charge.
Optionally, the determining, according to the internal resistance increase rate of the battery to be tested at the test temperature, the first cut-off state of charge corresponding to the internal resistance increase rate, and the preset multiplying power corresponding to the first cut-off state of charge, the second charging policy of the battery to be tested at different test temperatures includes:
determining a second cut-off state of charge of the battery to be tested at different test temperatures according to a difference value of the first cut-off state of charge and a first product corresponding to the internal resistance increase rate, wherein the first product is a product of the internal resistance increase rate of the battery to be tested at the test temperature and the preset multiplying power corresponding to the first cut-off state of charge;
and determining the second charging strategy of the battery to be tested at the test temperature according to the preset multiplying power and the second cut-off state of charge corresponding to the preset multiplying power.
Optionally, the preset magnification includes at least one of 0.33C, 0.5C, 1C, 1.5C, 2C, 2.5C, and 3C.
Optionally, the preset temperature is higher than 10 DEG C
Optionally, the preset temperature is 25 ℃.
In a second aspect, the embodiment of the invention also provides a device for preparing a quick charging strategy, which comprises a first charging strategy determining module, an internal resistance growth rate determining module and a second charging strategy determining module;
the first charging strategy determining module is used for determining a first charging strategy of the battery to be tested at a preset temperature by adopting a three-electrode method, wherein the first charging strategy comprises a preset multiplying power and a first cut-off state of charge corresponding to the preset multiplying power;
the internal resistance increase rate determining module is used for determining the internal resistance increase rate of the battery to be tested under the condition that the state of charge is the first cut-off state of charge at different test temperatures relative to the preset temperature according to an internal resistance test;
the second charging strategy determining module is configured to determine a second charging strategy of the battery to be tested at different test temperatures according to the internal resistance increase rate of the battery to be tested at the test temperatures, the first cut-off state of charge corresponding to the internal resistance increase rate, and the preset multiplying power corresponding to the first cut-off state of charge, where the second charging strategy includes the preset multiplying power and a second cut-off state of charge corresponding to the preset multiplying power.
Optionally, the second charging policy determining module includes: a second off state of charge determination unit and a second charging strategy determination unit;
the second cut-off state-of-charge determining unit is configured to determine a second cut-off state-of-charge of the battery to be tested at different test temperatures according to a difference value between the first cut-off state-of-charge corresponding to the internal resistance increase rate and a first product, where the first product is a product of the internal resistance increase rate of the battery to be tested at the test temperature and the preset multiplying power corresponding to the first cut-off state-of-charge;
the second charging strategy determining unit is used for determining the second charging strategy of the battery to be tested at the test temperature according to the preset multiplying power and the second cut-off charge state corresponding to the preset multiplying power.
In a third aspect, an embodiment of the present invention further provides an electronic device, including:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of formulating a fast charge strategy as set forth in any of the first aspects.
According to the method and the device for formulating the quick charge strategy and the electronic equipment provided by the embodiment of the invention, the internal resistance of the battery to be tested is tested on the basis of the first charge strategy determined by the three-electrode method. And determining the internal resistance increase rate of the battery to be tested under the condition that the state of charge is the first cut-off state of charge at different test temperatures relative to the preset temperature according to an internal resistance test. According to the internal resistance growth rate of the battery to be tested at the test temperature, the first cut-off state of charge corresponding to the internal resistance growth rate and the preset multiplying power corresponding to the first cut-off state of charge, a second charging strategy of the battery to be tested at different test temperatures is determined, the establishment of a quick charging strategy of the battery to be tested is realized, the establishment method uses a three-electrode method to measure the charging strategy at the preset temperature in a small amount, and based on the charging strategy at the preset temperature and test data of the internal resistance test, the charging strategies at other temperatures are determined through the relation between data analysis and data, so that the use of the three-electrode method at different temperatures is avoided, the accuracy of strategy establishment is improved, the speed of data analysis is high, and the efficiency of strategy establishment is greatly improved.
Drawings
Fig. 1 is a flow chart of a method for making a quick charge strategy according to an embodiment of the present invention;
fig. 2 is a flow chart of another method for formulating a fast charging strategy according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a device for making a quick charging strategy according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a composition of another device for making a quick charge policy according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The embodiment of the invention provides a method for formulating a quick charge strategy. Fig. 1 is a flow chart of a method for making a quick charge policy according to an embodiment of the present invention. Referring to fig. 1, the method for making the fast charging strategy includes:
s101, determining a first charging strategy of the battery to be tested at a preset temperature by adopting a three-electrode method.
The first charging strategy refers to a charging setting parameter of the battery to be tested for quick charging at a preset temperature, and the first charging strategy may include a preset multiplying power and a first cut-off state of charge corresponding to the preset multiplying power. The battery to be tested is a lithium battery. The three-electrode method is a method for analyzing the positive and negative electrode potential changes of the battery to be tested under different working conditions by implanting a reference electrode in the battery to be tested.
Specifically, a three-electrode method is adopted to respectively carry out charging operations with different preset multiplying powers on electrodes to be detected, and the charge state when the battery to be detected reaches the lithium precipitation potential is determined to be a first cut-off charge state corresponding to the preset multiplying power. And determining a first charging strategy according to the preset multiplying power and the corresponding first cut-off state of charge, and charging to the corresponding first cut-off state of charge by adopting the preset multiplying power if the ambient temperature is equal to the preset temperature in the quick charging process. For example, the preset magnifications are respectively 1C, 1.5C, 2C, 2.5C and 3C, and when the preset temperature is 25 ℃, it is determined that the first cut-off charge states corresponding to the preset magnifications in sequence are respectively 100%, 98%, 95%, 91% and 85%, then the charging strategy at 25 ℃ can be that 3C is used for charging to 85%, 2.5C is used for charging from 85% to 91%, 2C is used for charging from 91% to 95%, 1.5C is used for charging from 95% to 98%, and 1C is used for charging from 98% to 100%, and the quick charging process is finished.
S102, determining the internal resistance increase rate of the battery to be tested under the condition that the state of charge is the first cut-off state of charge at different test temperatures relative to the preset temperature according to the internal resistance test.
The internal resistance test is a test for detecting the internal resistance value of the battery to be tested. The internal resistance increase rate refers to the internal resistance value of the battery to be tested with the state of charge being the first cut-off state of charge at a certain test temperature relative to the internal resistance value of the battery to be tested with the state of charge being the first cut-off state of charge at a preset temperature. The internal resistance increase rate refers to the internal resistance increase rate of the battery to be tested at other test temperatures relative to the battery to be tested at the preset temperature under the condition that the charge states are equal to the same first cut-off charge state. The positive internal resistance increase rate indicates that the internal resistance of the battery to be measured at the preset temperature is greater than the internal resistance of the battery to be measured at the preset temperature, and the negative internal resistance increase rate indicates that the internal resistance of the battery to be measured at the preset temperature is less than the internal resistance of the battery to be measured at the preset temperature.
Specifically, the internal resistance test conditions are provided with two groups, one group is a state of charge, the state of charge of the battery to be tested can be set to be different first cut-off states of charge, and the other group is a test temperature, and the test temperature can be set according to the environmental temperature of the battery to be tested in the use process. The internal resistance test of the battery to be tested can be sequentially tested when the set environmental temperature is sequentially different test temperatures under a certain state of charge, the state of charge is adjusted until the internal resistance test under all states of charge (all first cut-off states of charge) is completed, and test data of the internal resistance test are obtained. The test data comprises a state of charge, a test temperature and internal resistance values corresponding to the first two test conditions, wherein the state of charge comprises a first cut-off state of charge, and the test temperature comprises a preset temperature and other temperatures. According to the internal resistance test, the internal resistance increase rate of the battery to be tested in the first cut-off state of charge at different test temperatures relative to the preset temperature can be determined through a data analysis mode.
Illustratively, the first off state of charge charged with 1.5C at the preset temperature is 98%, the test data obtained by the internal resistance test shows that the internal resistance of the battery under test having 98% of the state of charge at 25 ℃ is 0.5mΩ, and the internal resistance of the battery under test having 98% of the state of charge at 15 ℃ is 0.7mΩ, then the internal resistance increase rate of the battery under test at 98% is equal to (0.7-0.5)/0.5=40% with respect to the preset temperature at 15 ℃.
And S103, determining a second charging strategy of the battery to be tested at different test temperatures according to the internal resistance increasing rate of the battery to be tested at the test temperature, the first cut-off charge state corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off charge state.
The second charging strategy comprises a preset multiplying power and a second cut-off state of charge corresponding to the preset multiplying power.
Specifically, in step S102, it may be known that each internal resistance increase rate corresponds to a first off-state of charge. In step S101, it can be known that each first off-state of charge corresponds to a preset multiplying power. The cut-off state of charge of the battery to be tested at each preset multiplying power and the test temperature can be related to the internal resistance increasing rate of the battery to be tested at the test temperature, the first cut-off state of charge corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off state of charge respectively. According to the internal resistance increasing rate of the battery to be tested at the test temperature, the first cut-off charge state corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off charge state, the second cut-off charge state of the battery to be tested at each preset multiplying power and the test temperature can be calculated, and then the second charging strategies of the battery to be tested at different test temperatures are determined.
In an exemplary embodiment, when the charging rates are equal, the difference values of the cut-off states of charge of the same battery to be tested charged at different temperatures are respectively positively correlated with the charging rate and the internal resistance increase rate of the battery to be tested at the test temperature, so that the second cut-off states of charge of the battery to be tested at each preset rate and the test temperature can be calculated according to the internal resistance increase rate of the battery to be tested at the test temperature, the first cut-off state of charge corresponding to the internal resistance increase rate, and the preset rate corresponding to the first cut-off state of charge, and further the second charging strategy of the battery to be tested at different test temperatures can be determined. The second charging strategy of the battery to be tested at a certain test temperature comprises a preset multiplying power and a second cut-off state of charge corresponding to the preset multiplying power, wherein the second cut-off state of charge is the state of charge which is reached by the battery to be tested when the battery to be tested is charged by adopting the preset multiplying power at the test temperature and the cut-off state of charge is needed.
According to the method for formulating the fast charging strategy, the internal resistance of the battery to be tested is tested on the basis of the first charging strategy determined by the three-electrode method. And determining the internal resistance increase rate of the battery to be tested in the first cut-off state of charge at different test temperatures relative to the preset temperature according to the internal resistance test. According to the internal resistance increasing rate of the battery to be tested at the test temperature, the first cut-off charge state corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off charge state, the second charging strategy of the battery to be tested at different test temperatures is determined, the formulation of the quick charging strategy of the battery to be tested is realized, the charging strategy at the preset temperature is measured by using a three-electrode method in a small amount, the charging strategies at other temperatures are determined based on the charging strategy at the preset temperature and the test data of the internal resistance test through the relation between data analysis and data, the use of the three-electrode method at different temperatures is avoided, the accuracy of strategy formulation is improved, the speed of data analysis is higher, and the efficiency of the strategy formulation method is greatly improved.
Fig. 2 is a flow chart of another method for making a fast charging policy according to an embodiment of the present invention, and referring to fig. 2, the method for making a fast charging policy includes:
and S201, respectively carrying out charging operations with different preset multiplying powers on the battery to be tested by adopting a three-electrode method at a preset temperature.
Specifically, the preset temperature may be related to the ambient temperature of the operating environment of the battery to be measured, and in order to ensure the effectiveness of the three-electrode method in this step, the preset temperature may be set to be higher than 10 ℃, and, for example, in the case where the ambient temperature of the permanent operating environment of the battery to be measured is between 15 ℃ and 25 ℃, the preset temperature may be set to 25 ℃. The preset magnification may be set according to a magnification commonly used at the time of quick charge of the battery to be measured, and may include at least one of 0.33C, 0.5C, 1C, 1.5C, 2C, 2.5C, and 3C, for example. At preset temperature, charging equipment can be utilized to respectively provide charging currents with different preset multiplying powers for the battery to be tested, so that multiple charging operations of the battery to be tested are realized. Each charging operation may begin from a 0% state of charge of the battery under test. The battery to be measured in the step is implanted with a reference electrode in the middle of the electrode slice by a three-electrode method, so that the electrode potential of the electrode to be measured can be conveniently measured.
S202, detecting the negative electrode potential of the battery to be detected in the charging operation process.
Specifically, in each charging operation, it is necessary to detect the negative electrode potential of the battery to be measured. The potential of the negative electrode can be determined according to the potential difference between the reference electrode and the negative electrode, so that the negative electrode potential of the battery to be measured is higher than the lithium precipitation potential in the charging process. The lithium precipitation potential refers to the potential at which lithium precipitation begins to occur at the negative electrode of the battery to be measured, and can be determined according to experiments.
And S203, when the negative electrode potential reaches the lithium precipitation potential, determining the real-time charge state of the battery to be detected as a first cut-off charge state corresponding to the preset multiplying power.
Specifically, in the charging operation, if it is detected that the negative electrode potential of the battery to be measured is reduced to reach the lithium precipitation potential, it indicates that the negative electrode lithium precipitation will occur by continuing to use the preset multiplying power, and normal charging cannot be performed, and then the real-time state of charge of the battery to be measured can be determined as the first cut-off state of charge corresponding to the preset multiplying power. For example, if the real-time state of charge of the battery to be measured is 60% when the battery to be measured is charged to the lithium precipitation potential by using 1.5C at the preset temperature of 25 ℃, the first cut-off state of charge corresponding to the preset rate of 1.5C of the battery to be measured is 60%.
S204, determining a first charging strategy of the battery to be tested at a preset temperature according to the preset multiplying power and the corresponding first cut-off state of charge.
Specifically, the first charging strategy includes a preset multiplying power and a first cut-off state of charge corresponding to a preset temperature. The first charging strategy may represent a state of charge threshold for charging with a preset rate at a preset temperature. According to the first cut-off state of charge corresponding to the preset multiplying power determined in step S203, a first charging policy may be determined. For example, if the preset magnifications are 0.5C, 1C, 1.5C, 2C, and 2.5C, where 0.5C corresponds to a first off state of charge of 100% SOC (SOC is state of charge), 1C corresponds to a first off state of charge of 80% SOC,1.5C corresponds to a first off state of charge of 60% SOC,2C corresponds to a first off state of charge of 40% SOC, and 2.5C corresponds to a first off state of charge of 20% SOC. Further, according to the preset multiplying power and the corresponding first cut-off charge state, the first charging strategy can be determined as follows: charging from 0% to 20% soc with 2.5C, then from 20% to 40% soc with 2C, then from 40% to 60% soc with 1.5C, then from 60% to 80% soc with 2C, and finally from 80% to 100% soc with 2.5C.
S205, determining internal resistance values of the battery to be tested at preset temperature and different test temperatures respectively under the condition that the state of charge is the first cut-off state of charge according to test data obtained by the mixed power pulse characteristic test.
Specifically, the internal resistance test includes a hybrid power pulse characteristic test (also referred to as an HPPC test). And adopting a mixed power pulse characteristic test to finish the test of the internal resistance values of the battery to be tested at a preset temperature and different test temperatures of the battery to be tested in a first cut-off charge state, wherein the charging multiplying power of the mixed power pulse characteristic test can be 1C and the charging time is 30 seconds.
Illustratively, the preset magnifications are 0.5C, 1C, 1.5C, 2C and 2.5C. At a preset temperature of 25 ℃, the first cut-off state of charge corresponding to 0.5C is 100 percent SOC, the first cut-off state of charge corresponding to 1C is 80 percent SOC, the first cut-off state of charge corresponding to 1.5C is 60 percent SOC, the first cut-off state of charge corresponding to 2C is 40 percent SOC, the first cut-off state of charge corresponding to 2.5C is 20 percent SOC, and the test temperature comprises a plurality of other temperatures of-25 ℃, -20 ℃, -15 ℃, -10 ℃, -5 ℃,0 ℃, 5 ℃, 10 ℃, 15 ℃ and 20 ℃ besides the preset temperature, in the internal resistance test, the internal resistance value of the battery to be tested at the preset temperature of 25 ℃ is determined by adopting a mixed power pulse characteristic test, and the internal resistance values of the battery to be tested at the preset temperature of 20%, 40%, 60%, 80% and 100% are also determined by adopting the mixed power pulse characteristic test, determining the internal resistance values of the battery to be measured at-25 ℃ at 20%, 40%, 60%, 80% and 100%, determining the internal resistance values of the battery to be measured at-20 ℃ at 20%, 40%, 60%, 80% and 100%, determining the internal resistance values of the battery to be measured at-15 ℃ at 20%, 40%, 60%, 80% and 100%, determining the internal resistance values of the battery to be measured at-10 ℃ at 20%, 40%, 60%, 80% and 100%, determining the internal resistance values of the battery to be measured at-5 ℃ at 20%, 40%, 60%, 80% and 100%, determining the internal resistance values of the battery to be measured at 0 ℃ at 20%, 40%, 60%, 80% and 100%, respectively, determining the internal resistance values of the battery to be measured at 5 ℃ at 20%, 40%, 60%, 80% and 100%, internal resistance values of the battery to be measured at 10 ℃ at 20%, 40%, 60%, 80% and 100% are respectively determined, internal resistance values of the battery to be measured at 15 ℃ at 20%, 40%, 60%, 80% and 100% are respectively determined, and internal resistance values of the battery to be measured at 20 ℃ at 20%, 40%, 60%, 80% and 100% are respectively determined.
S206, calculating the internal resistance difference value of the battery to be tested in the first cut-off state of charge at the test temperature and at the preset temperature.
Specifically, before determining that the state of charge at the test temperature is the internal resistance increase rate of the battery to be tested in the first cut-off state of charge, firstly, calculating the difference between the internal resistance value of the battery to be tested at the test temperature and the internal resistance value at the preset temperature in the first cut-off state of charge, that is, the internal resistance difference between the battery to be tested at the test temperature and the preset temperature in the first cut-off state of charge.
For example, to determine the internal resistance increase rate of the battery under test with a test temperature of 20 ℃, the internal resistance difference between the internal resistance value of the battery under test with a state of charge of 80% at 20 ℃ and the internal resistance value of the battery under test at a preset temperature of 25 ℃ needs to be calculated in advance.
S207, determining the internal resistance increase rate of the battery to be tested with the state of charge being the first cut-off state of charge at the test temperature according to the ratio of the internal resistance difference value to the internal resistance value of the battery to be tested with the first cut-off state of charge at the preset temperature.
Specifically, the internal resistance difference value of the battery to be measured in the first cut-off state of charge at the test temperature and the preset temperature is compared with the internal resistance value of the battery to be measured at the preset temperature, so that the internal resistance increase rate of the battery to be measured, of which the state of charge is the first cut-off state of charge at the test temperature, can be determined.
Illustratively, the internal resistance increase rate of the battery under test having a state of charge of 80% at 20 ℃ may be determined by dividing the internal resistance difference between the internal resistance value of the battery under test having a state of charge of 80% at 20 ℃ and the internal resistance value of the battery under test having a preset temperature of 25 ℃ by the internal resistance value of the battery under test having a state of charge of 80% at the preset temperature of 25 ℃.
S208, determining a second cut-off state of charge of the battery to be tested at different test temperatures according to a difference value of the first cut-off state of charge and the first product corresponding to the internal resistance increase rate.
Specifically, the first product is a product of an internal resistance increase rate of the battery to be tested at the test temperature and a preset multiplying power corresponding to the first cut-off state of charge. And calculating the product of the internal resistance increasing rate of the battery to be tested at the test temperature and the preset multiplying power corresponding to the first cut-off state of charge, further calculating the difference value of the first cut-off state of charge corresponding to the internal resistance increasing rate and the first product, and determining the second cut-off state of charge of the battery to be tested at the test temperature according to the difference value. For example, at the test temperature D, the second cut-off state of charge C of the battery to be tested charged with the charge rate ase:Sub>A may be equal to the first cut-off state of charge B corresponding to the charge rate ase:Sub>A at the preset temperature minus the product of the charge rate ase:Sub>A and the internal resistance increase rate of the battery to be tested with the charge rate B at the test temperature D, and expressed as c=b-ase:Sub>A by the formulase:Sub>A, where ase:Sub>A% refers to the internal resistance increase rate of the battery to be tested with the charge rate ase:Sub>A at the test temperature.
S209, determining a second charging strategy of the battery to be tested at the test temperature according to the preset multiplying power and a second cut-off charge state corresponding to the preset multiplying power.
Specifically, according to the preset multiplying power and the second cut-off state of charge corresponding to the preset multiplying power, the second charging strategy of the battery to be tested at the test temperature may be determined, and by way of example, the preset multiplying power is 0.33C, 0.5C, 1C, 1.5C, 2C, 2.5C and 3C, the second cut-off state of charge corresponding to 0.33C at 20 ℃ is 100%, the second cut-off state of charge corresponding to 0.5C is 90%, the second cut-off state of charge corresponding to 1C is 80%, the second cut-off state of charge corresponding to 1.5C is 70%, the second cut-off state of charge corresponding to 2C is 60%, the second cut-off state of charge corresponding to 2.5C is 40% and the second cut-off state of charge corresponding to 3C is 20%, then the second charging strategy of the battery to be tested at the test temperature is: firstly, 3C is charged from 0% to 20% of SOC, then 2.5C is charged from 20% to 40% of SOC, secondly 2C is charged from 40% to 60% of SOC, then 1.5C is charged from 60% to 70% of SOC,1C is charged from 70% to 80% of SOC, then 0.5C is charged from 80% to 90% of SOC, finally 0.33C is charged from 90% to 100% of SOC and charging is completed.
According to the method for formulating the fast charging strategy, based on the first charging strategy of the battery to be tested at the preset temperature determined by the three-electrode method, the second cut-off charge states corresponding to all preset multiplying factors at other temperatures are determined by adopting the data processing and calculating modes, and then the second charging strategy at other temperatures is formulated, so that the fast formulation of the fast charging strategy without lithium precipitation is realized, the lithium plating layer of the reference electrode in the three-electrode method is unstable at low temperature, the decomposition failure of the lithium plating layer easily occurs in the process of changing the temperature of the battery core, and compared with the method for determining the cut-off charge states corresponding to different preset multiplying factors at all test temperatures by adopting the three-electrode method in sequence, the decomposition failure of the lithium plating layer is avoided, and the reliability of the formulation strategy is improved. In addition, the data analysis and calculation modes determine the second cut-off state of charge at each temperature, and compared with the mode of actually measuring the second cut-off state of charge at each temperature by adopting a three-electrode method, the method is more convenient and short in time and improves the strategy formulation efficiency.
The embodiment of the present invention further provides a device for preparing a quick charge policy, and fig. 3 is a schematic diagram of the device for preparing a quick charge policy provided in the embodiment of the present invention, and referring to fig. 3, a device 300 for preparing a quick charge policy includes a first charging policy determining module 301, an internal resistance growth rate determining module 302, and a second charging policy determining module 303. The first charging strategy determining module 301 is configured to determine a first charging strategy of a battery to be tested at a preset temperature by using a three-electrode method, where the first charging strategy includes a preset multiplying power and a first cut-off state of charge corresponding to the preset multiplying power. The internal resistance increase rate determining module 302 is configured to determine, according to an internal resistance test, an internal resistance increase rate of the battery to be tested at different test temperatures relative to a preset temperature under the condition that the state of charge is the first cutoff state of charge. The second charging policy determining module 303 is configured to determine a second charging policy of the battery to be tested at different test temperatures according to an internal resistance increase rate of the battery to be tested at the test temperature, a first cut-off state of charge corresponding to the internal resistance increase rate, and a preset multiplying power corresponding to the first cut-off state of charge, where the second charging policy includes the preset multiplying power and the second cut-off state of charge corresponding to the preset multiplying power.
The fast charging strategy making device provided by the embodiment performs internal resistance test on the battery to be tested on the basis of the first charging strategy determined by the three-electrode method. And determining the internal resistance increase rate of the battery to be tested in the first cut-off state of charge at different test temperatures relative to the preset temperature according to the internal resistance test. According to the internal resistance increasing rate of the battery to be tested at the test temperature, the first cut-off charge state corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off charge state, the second charging strategy of the battery to be tested at different test temperatures is determined, the formulation of the quick charging strategy of the battery to be tested is realized, the charging strategy at the preset temperature is measured by a small amount of three-electrode method, the charging strategies at other temperatures are determined based on the charging strategy at the preset temperature and the test data of the internal resistance test through the relation between data analysis and data, the use of the three-electrode method at different temperatures is avoided, the accuracy of strategy specification is improved, the speed of data analysis is higher, and the efficiency of strategy formulation is greatly improved.
Optionally, fig. 4 is a schematic diagram of the composition of another fast charge policy making device provided in the embodiment of the present invention, and based on the foregoing embodiment, the second charge policy determining module 303 includes a second off state of charge determining unit 401 and a second charge policy determining unit 402, where the second off state of charge determining unit 401 is configured to determine, according to a difference between a first off state of charge corresponding to an internal resistance increase rate and a first product, a second off state of charge of the battery under test at different test temperatures, where the first product is a product of the internal resistance increase rate of the battery under test at the test temperature and a preset multiplying power corresponding to the first off state of charge. The second charging policy determining unit 402 is configured to determine a second charging policy of the battery to be tested at the test temperature according to the preset multiplying power and a second cut-off state of charge corresponding to the preset multiplying power.
According to the formulation device of the quick charge strategy, based on the first charge strategy of the battery to be tested at the preset temperature determined by the three-electrode method, the second cut-off charge states corresponding to all preset multiplying factors at other temperatures are determined by adopting a data processing and calculating mode, and then the second charge strategies at other temperatures are formulated, so that the quick formulation of the quick charge strategy without lithium precipitation is realized, the lithium plating layer of the reference electrode in the three-electrode method is unstable at low temperature, the decomposition failure of the lithium plating layer easily occurs in the process of changing the temperature of the battery core, and compared with the mode of sequentially testing and determining the cut-off charge states corresponding to different preset multiplying factors at all test temperatures by adopting the three-electrode method, the decomposition failure of the lithium plating layer is avoided, and the reliability of the formulation strategy is improved. In addition, the data analysis and calculation modes determine the second cut-off state of charge at each temperature, and compared with the mode of actually measuring the second cut-off state of charge at each temperature by adopting a three-electrode method, the method is more convenient and short in time and improves the strategy formulation efficiency.
The embodiment of the present invention further provides an electronic device, fig. 5 is a schematic composition diagram of an electronic device provided by the embodiment of the present invention, and referring to fig. 5, an electronic device 500 includes: at least one processor 501; and a memory 502 communicatively coupled to the at least one processor 501; the memory 502 stores a computer program executable by the at least one processor 501, and the computer program is executed by the at least one processor 501, so that the at least one processor 501 can execute the method for formulating the fast charging policy in any of the foregoing embodiments.
According to the method and the device for formulating the quick charge strategy and the electronic equipment provided by the embodiment of the invention, the internal resistance of the battery to be tested is tested on the basis of the first charge strategy determined by the three-electrode method. And determining the internal resistance increase rate of the battery to be tested in the first cut-off state of charge at different test temperatures relative to the preset temperature according to the internal resistance test. According to the internal resistance increasing rate of the battery to be tested at the test temperature, the first cut-off charge state corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off charge state, the second charging strategy of the battery to be tested at different test temperatures is determined, the establishment of the quick charging strategy of the battery to be tested is realized, the three-electrode method is used for measuring the charging strategy at the preset temperature in a small amount, the charging strategies at other temperatures are determined based on the charging strategy at the preset temperature and the test data of the internal resistance test, the use of the three-electrode method at different temperatures is avoided, the accuracy of strategy establishment is improved, the speed of data analysis is higher, and the efficiency of strategy establishment is greatly improved.
The product can execute the method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The method for formulating the quick charge strategy is characterized by comprising the following steps:
determining a first charging strategy of a battery to be tested at a preset temperature by adopting a three-electrode method, wherein the first charging strategy comprises a preset multiplying power and a first cut-off charge state corresponding to the preset multiplying power;
determining the internal resistance increase rate of the battery to be tested under the condition that the state of charge is the first cut-off state of charge at different test temperatures relative to the preset temperature according to an internal resistance test;
and determining a second charging strategy of the battery to be tested at different test temperatures according to the internal resistance increasing rate of the battery to be tested at the test temperatures, the first cut-off state of charge corresponding to the internal resistance increasing rate and the preset multiplying power corresponding to the first cut-off state of charge, wherein the second charging strategy comprises the preset multiplying power and a second cut-off state of charge corresponding to the preset multiplying power.
2. The method for preparing a fast charge strategy according to claim 1, wherein the determining a first charge strategy of the battery to be tested at a preset temperature by using a three-electrode method comprises:
at the preset temperature, respectively carrying out charging operations with different preset multiplying powers on the battery to be tested by adopting the three-electrode method;
detecting the negative electrode potential of the battery to be detected in the charging operation process;
when the negative electrode potential reaches a lithium precipitation potential, determining the real-time charge state of the battery to be detected as the first cut-off charge state corresponding to the preset multiplying power;
and determining the first charging strategy of the battery to be tested at the preset temperature according to the preset multiplying power and the corresponding first cut-off state of charge.
3. The method of claim 1, wherein the internal resistance test comprises a hybrid power pulse characteristic test;
the determining, according to the internal resistance test, the internal resistance increase rate of the battery to be tested under the condition that the state of charge is the first cut-off state of charge at different test temperatures relative to the preset temperature includes:
according to test data obtained by the mixed power pulse characteristic test, determining internal resistance values of the battery to be tested at the preset temperature and different test temperatures respectively under the condition that the state of charge is the first cut-off state of charge;
calculating the internal resistance difference value of the battery to be tested at the test temperature and the preset temperature under the condition that the state of charge is the first cut-off state of charge;
and determining the internal resistance increase rate of the battery to be tested, the state of charge of which is the first cut-off state of charge at the test temperature, according to the ratio of the internal resistance difference value to the internal resistance value of the battery to be tested at the preset temperature at the first cut-off state of charge.
4. The method for formulating a fast charge strategy according to claim 1, wherein determining a second charge strategy of the battery under test at different test temperatures according to the internal resistance increase rate of the battery under test at the test temperature, the first off-state of charge corresponding to the internal resistance increase rate, and the preset multiplying power corresponding to the first off-state of charge comprises:
determining a second cut-off state of charge of the battery to be tested at different test temperatures according to a difference value of the first cut-off state of charge and a first product corresponding to the internal resistance increase rate, wherein the first product is a product of the internal resistance increase rate of the battery to be tested at the test temperature and the preset multiplying power corresponding to the first cut-off state of charge;
and determining the second charging strategy of the battery to be tested at the test temperature according to the preset multiplying power and the second cut-off state of charge corresponding to the preset multiplying power.
5. The method of claim 1-4, wherein the predetermined multiplying power comprises at least one of 0.33C, 0.5C, 1C, 1.5C, 2C, 2.5C, and 3C.
6. The method for preparing a quick charge strategy according to any one of claims 1 to 4, wherein the preset temperature is higher than 10 ℃.
7. The method of claim 6, wherein the predetermined temperature is 25 ℃.
8. The utility model provides a quick charge strategy's formulating device which characterized in that includes:
the first charging strategy determining module is used for determining a first charging strategy of the battery to be tested at a preset temperature by adopting a three-electrode method, wherein the first charging strategy comprises a preset multiplying power and a first cut-off state of charge corresponding to the preset multiplying power;
the internal resistance increase rate determining module is used for determining the internal resistance increase rate of the battery to be tested under the condition that the state of charge is the first cut-off state of charge at different test temperatures relative to the preset temperature according to an internal resistance test;
the second charging strategy determining module is configured to determine a second charging strategy of the battery to be tested at different test temperatures according to the internal resistance increase rate of the battery to be tested at the test temperatures, the first cut-off state of charge corresponding to the internal resistance increase rate, and the preset multiplying power corresponding to the first cut-off state of charge, where the second charging strategy includes the preset multiplying power and a second cut-off state of charge corresponding to the preset multiplying power.
9. The apparatus for developing a fast charging policy according to any one of claims 8, wherein the second charging policy determining module includes:
a second cut-off state of charge determining unit, configured to determine, according to a difference value between the first cut-off state of charge corresponding to the internal resistance increase rate and a first product of the internal resistance increase rate of the battery to be tested and the preset multiplying power corresponding to the first cut-off state of charge at different test temperatures, where the first product is a product of the internal resistance increase rate of the battery to be tested at the test temperatures and the preset multiplying power corresponding to the first cut-off state of charge;
and the second charging strategy determining unit is used for determining the second charging strategy of the battery to be tested at the test temperature according to the preset multiplying power and the second cut-off charge state corresponding to the preset multiplying power.
10. An electronic device, the electronic device comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein, the liquid crystal display device comprises a liquid crystal display device,
the memory stores a computer program executable by the at least one processor to enable the at least one processor to perform the method of formulating a fast charge strategy according to any one of claims 1-6.
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| CN117261670A (en) * | 2023-11-22 | 2023-12-22 | 广汽埃安新能源汽车股份有限公司 | Electric automobile charging control method, storage medium and electronic equipment |
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| CN117261670A (en) * | 2023-11-22 | 2023-12-22 | 广汽埃安新能源汽车股份有限公司 | Electric automobile charging control method, storage medium and electronic equipment |
| CN117261670B (en) * | 2023-11-22 | 2024-01-30 | 广汽埃安新能源汽车股份有限公司 | Electric automobile charging control method, storage medium and electronic equipment |
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