CN116315191A - Method and device for determining battery charging strategy and computer storage medium - Google Patents
Method and device for determining battery charging strategy and computer storage medium Download PDFInfo
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- 238000007600 charging Methods 0.000 title claims abstract description 651
- 238000000034 method Methods 0.000 title claims abstract description 55
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 107
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 107
- 238000001556 precipitation Methods 0.000 claims abstract description 62
- 238000004904 shortening Methods 0.000 abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 41
- 229910001416 lithium ion Inorganic materials 0.000 description 41
- 238000011161 development Methods 0.000 description 13
- 238000012360 testing method Methods 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000010277 constant-current charging Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004590 computer program Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- 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
-
- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
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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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a method and a device for determining a battery charging strategy and a computer storage medium, wherein the method comprises the following steps: charging the battery to different preset SOCs (state of charge) at least by one first charging rate, and determining the SOC lithium analysis condition corresponding to each first charging rate; determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium precipitation conditions corresponding to the first charging rates, wherein the SOC lithium precipitation conditions corresponding to the target charging rates represent the lithium precipitation phenomenon of the battery when the battery is charged to at least one preset SOC by the target charging rates; charging the battery to a target SOC (state of charge) with at least one second charging rate according to the target charging rate, and obtaining a charging result corresponding to each second charging rate; and if the charging result corresponding to the second charging rate meets the preset condition, determining a charging strategy of the battery according to the second charging rate. It can be seen that implementing the present invention can facilitate shortening the determination time of the charging strategy.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a method and apparatus for determining a battery charging policy, and a computer storage medium.
Background
With the development of battery technology, batteries are increasingly used. For example, lithium ion batteries are increasingly used in pure electric vehicles. The mileage anxiety of the electric automobile becomes a big pain point, and the quick charge becomes a big solution.
At present, different charging strategies are designed, and then various charging strategies are verified, so that the charging strategy of the battery is finally determined, and the battery can be rapidly charged through the determined charging strategy.
However, the design and verification of the battery charging strategy often requires a long time, greatly affects the development cycle, and increases the development cost.
Disclosure of Invention
The invention aims to solve the technical problems that the design and verification of the battery charging strategy in the prior art often need a long time, greatly influence the development period and increase the development cost. Therefore, the embodiment of the invention provides a method and a device for determining a battery charging strategy and a computer storage medium, which can be beneficial to shortening the determination time of the charging strategy, shortening the development period and saving the development cost.
In order to solve the above technical problem, a first aspect of the present invention discloses a method for determining a battery charging policy, the method comprising:
Charging the battery to different preset SOCs (state of charge) at least one first charging rate, and determining the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition is used for indicating whether the lithium precipitation phenomenon occurs when the battery is charged to different preset SOCs at the first charging rate;
determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition corresponding to the target charging rate indicates a lithium precipitation phenomenon of the battery when the battery is charged to at least one preset SOC by the target charging rate;
charging the battery to the target SOC at least one second charging rate according to the target charging rate, and obtaining a charging result corresponding to each second charging rate;
and if the charging result corresponding to the second charging rate meets the preset condition, determining a charging strategy of the battery according to the second charging rate.
As an optional implementation manner, in the first aspect of the present invention, the charging the battery to different preset SOCs with at least one first charging rate includes:
Charging the battery to different preset SOCs at the ith first charging rate;
if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon of the battery does not occur in any preset SOC, determining the (i+1) th first charging rate according to a preset first step length, and charging the battery to different preset SOCs by the (i+1) th first charging rate, wherein i is a natural number above 1;
determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium analysis condition corresponding to each first charging rate, including:
and if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon occurs in at least one preset SOC of the battery, taking the ith first charging rate as the target charging rate, and determining the target SOC according to the lithium analysis SOC interval corresponding to the target charging rate.
In a first aspect of the present invention, determining the target charging rate of at least one of the first charging rates and the target SOC corresponding to the target charging rate according to the SOC lithium analysis situation corresponding to each of the first charging rates includes:
Determining a candidate charging rate in at least one first charging rate, wherein the SOC lithium-ion condition corresponding to the candidate charging rate indicates that at least one preset SOC of the battery is subjected to lithium-ion;
determining a lithium analysis SOC interval corresponding to the minimum candidate charging rate according to the SOC lithium analysis condition corresponding to the minimum candidate charging rate;
and taking the smallest candidate charging multiplying power as the target charging multiplying power, and determining the target SOC according to a lithium-ion analysis SOC interval corresponding to the target charging multiplying power.
As an optional implementation manner, in the first aspect of the present invention, the target SOC is one of SOCs in a lithium-ion separation SOC interval corresponding to the target charging rate, and the second charging rate is smaller than the target charging rate;
or alternatively, the process may be performed,
the target SOC is smaller than any one of the lithium-precipitation SOC intervals corresponding to the target charging rate, and the second charging rate is larger than or equal to the target charging rate.
As an optional implementation manner, in the first aspect of the present invention, the target SOC is a minimum SOC in a lithium-precipitation SOC interval corresponding to the target charging rate.
As an optional implementation manner, in the first aspect of the present invention, the charging the battery to the target SOC at the at least one second charging rate according to the target charging rate includes:
Charging the battery to the target SOC at a jth second charging rate according to the target charging rate;
if the charging result corresponding to the jth second charging rate does not meet the preset condition, determining the jth+1th second charging rate according to a preset second step length, and charging the battery to the target SOC by the jth+1th second charging rate, wherein j is a natural number above 1;
and if the charging result corresponding to the second charging rate meets the preset condition, determining a charging strategy of the battery according to the second charging rate, including:
and if the charging result corresponding to the j-th second charging rate meets the preset condition, determining the charging strategy of the battery according to the j-th second charging rate.
As an alternative embodiment, in the first aspect of the present invention, the charging result includes a negative electrode absolute potential and a reference potential of the battery, the negative electrode absolute potential and the reference potential being determined by a three-electrode method, the charging result satisfying a preset condition, including:
the potential difference between the negative electrode absolute potential and the reference potential is greater than a potential difference threshold;
wherein the potential difference threshold is 0V.
As an optional implementation manner, in the first aspect of the present invention, the determining a charging policy of the battery according to the second charging rate includes:
and taking the second charging rate as the charging rate for charging the battery to the target SOC.
The second aspect of the present invention discloses a device for determining a battery charging policy, the device comprising:
the first determining module is used for charging the battery to different preset SOCs (state of charge) at least one first charging rate, and determining the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition is used for indicating whether the lithium precipitation phenomenon occurs when the battery is charged to different preset SOCs at the first charging rate;
the second determining module is used for determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition corresponding to the target charging rate indicates a lithium precipitation phenomenon of the battery when the battery is charged to at least one preset SOC by the target charging rate;
the charging result acquisition module is used for charging the battery to the target SOC at least one second charging rate according to the target charging rate, so as to obtain a charging result corresponding to each second charging rate;
And the charging strategy determining module is used for determining the charging strategy of the battery according to the second charging multiplying power if the charging result corresponding to the second charging multiplying power meets the preset condition.
As an optional implementation manner, in the second aspect of the present invention, the first determining module is configured to charge the battery to different preset SOCs at the ith first charging rate; if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon of the battery does not occur in any preset SOC, determining the (i+1) th first charging rate according to a preset first step length, and charging the battery to different preset SOCs by the (i+1) th first charging rate, wherein i is a natural number above 1; the second determining module is configured to take the ith first charging rate as the target charging rate if the SOC lithium-ion condition corresponding to the ith first charging rate indicates that at least one of the preset SOCs of the battery is lithium-ion, and determine the target SOC according to a lithium-ion SOC interval corresponding to the target charging rate.
As an optional implementation manner, in a second aspect of the present invention, the target SOC is one of SOCs in a lithium-ion separation SOC interval corresponding to the target charging rate, and the second charging rate is smaller than the target charging rate;
Or alternatively, the process may be performed,
the target SOC is smaller than any one of the lithium-precipitation SOC intervals corresponding to the target charging rate, and the second charging rate is larger than or equal to the target charging rate.
As an optional embodiment, in the second aspect of the present invention, the target SOC is a minimum SOC in a lithium-out SOC section corresponding to the target charging rate.
As an optional implementation manner, in the second aspect of the present invention, the second determining module is configured to charge the battery to the target SOC at a jth second charging rate according to the target charging rate; if the charging result corresponding to the jth second charging rate does not meet the preset condition, determining the jth+1th second charging rate according to a preset second step length, and charging the battery to the target SOC by the jth+1th second charging rate, wherein j is a natural number above 1; and the charging strategy determining module is used for determining the charging strategy of the battery according to the j-th second charging multiplying power if the charging result corresponding to the j-th second charging multiplying power meets the preset condition.
As an alternative embodiment, in the second aspect of the present invention, the charging result includes a negative electrode absolute potential and a reference potential of the battery, the negative electrode absolute potential and the reference potential being determined by a three-electrode method, the charging result satisfying a preset condition, including:
The potential difference between the negative electrode absolute potential and the reference potential is greater than a potential difference threshold;
wherein the potential difference threshold is 0V.
As an optional implementation manner, in the second aspect of the present invention, the charging policy determining module is configured to use the second charging rate as a charging rate for charging the battery to the target SOC.
In a third aspect, the present invention discloses another battery charging strategy determining device, which includes:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to perform the method of determining the battery charging policy disclosed in the first aspect of the present invention.
A fourth aspect of the present invention discloses a computer-readable medium storing computer instructions that, when invoked, are adapted to perform the method of determining a battery charging policy disclosed in the first aspect of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the battery is charged to different preset SOCs (state of charge) by at least one first charging rate, and the SOC lithium precipitation condition corresponding to each first charging rate is determined, wherein the SOC lithium precipitation condition is used for indicating whether the lithium precipitation phenomenon occurs when the battery is charged to different preset SOCs by the first charging rate; determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition corresponding to the target charging rate indicates a lithium precipitation phenomenon of the battery when the battery is charged to at least one preset SOC by the target charging rate; charging the battery to the target SOC at least one second charging rate according to the target charging rate, and obtaining a charging result corresponding to each second charging rate; if the charging result corresponding to the second charging rate meets the preset condition, determining the charging strategy of the battery according to the second charging rate, wherein the charging strategy of the battery can be determined through a series of steps and operations of the embodiment, so that the determination time of the charging strategy can be shortened, the development period can be shortened, and the development cost can be saved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining a battery charging strategy according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for determining a battery charging strategy according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for determining a battery charging strategy according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for determining a battery charging strategy according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a battery charging strategy determining apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a determination device of a battery charging strategy according to still another embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. 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.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or article that comprises a list of steps or elements is not limited to only those listed but may optionally include other steps or elements not listed or inherent to such process, method, article, or article.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention discloses a method and a device for determining a battery charging strategy and a computer storage medium, which can shorten the determination time of the charging strategy, shorten the development period and save the development cost. The following will describe in detail.
Example 1
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for determining a battery charging policy according to an embodiment of the invention. The method for determining the battery charging policy described in fig. 1 may be applied to the device for determining the battery charging policy, or may be implemented manually. The determination device of the battery charging policy may be a terminal, a server, a processor, a chip, a controller, etc. having data processing capability, and is not limited herein. As shown in fig. 1, the method for determining a battery charging policy may include:
The charging rate is a measure of the charging speed, and refers to the current value required by the battery when the battery is charged to a specific capacity at a specified time. SOC (state-of-charge) refers to the state of charge, also known as the residual capacity, of a battery, indicating the ability of the battery to continue to operate. The SOC lithium-separating condition is used to indicate whether the battery is separated from lithium when the battery is charged to different preset SOCs at the first charging rate, that is, the SOC lithium-separating condition may reflect at which preset SOC the first charging rate is separated from lithium and at which preset SOC the first charging rate is not separated from lithium when the battery is charged to different preset SOCs at the first charging rate.
In the present embodiment, the first charging magnification may be one or more, and the plurality refers to two or more. Specifically, when the first charging rate is one, the battery may be charged to different preset SOCs with the one first charging rate. When the first charging rates are multiple, the battery is charged to different preset SOCs by the first charging rates, so that the SOC lithium precipitation condition corresponding to the first charging rates can be determined.
In one possible implementation, the SOC lithium analysis situation corresponding to each first charging rate may be determined by voltage relaxation. And the lithium analysis condition of the SOC corresponding to one of the first charging multiplying powers is determined for explanation. Specifically, constant-current charging is carried out to 10% of SOC at a first charging multiplying power, the cut-off voltage is 3.7V, the rest is carried out for t min, a voltage curve chart during the rest time is recorded, the voltage differential is recorded as U1, a differential voltage U1-t curve is recorded, and the differential voltage U1-t curve is the voltage; constant-current charging is carried out to 20% of SOC at a first charging rate, the cut-off voltage is 3.7V, the time is set aside for t min, a voltage curve graph during the time is recorded, the voltage differential is recorded as U2, and a differential voltage U2-t curve graph is recorded. The differential voltage U1/U2-t curve graph is suddenly changed, and the slope of the differential curve is changed, so that lithium precipitation can be judged under the first charging multiplying power.
And 120, determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium precipitation conditions corresponding to the first charging rates, wherein the SOC lithium precipitation conditions corresponding to the target charging rates represent the lithium precipitation phenomenon of the battery when the battery is charged to at least one preset SOC by the target charging rates.
In this embodiment, the SOC lithium-out condition corresponding to the target charging rate indicates that the lithium-out phenomenon occurs when the battery is charged to at least one of the preset SOCs at the target charging rate, that is, the lithium-out phenomenon occurs when the battery is charged to at least one of the preset SOCs at the target charging rate. Specifically, the target charging rate corresponds to a lithium-analysis SOC section, and when the SOC in the lithium-analysis SOC section is charged at the target charging rate, the lithium-analysis phenomenon occurs in the battery. The target SOC may be an SOC within the lithium-analysis SOC interval or an SOC outside the lithium-analysis SOC interval, and is not limited herein.
For example, the at least one charging rate includes a first charging rate 1 and a second charging rate 2, the different preset SOCs include a preset SOC1 and a preset SOC2, and if the battery is charged to the preset SOC1 at the first charging rate 1, the battery is not subjected to the lithium precipitation phenomenon, and if the battery is charged to the preset SOC2 at the first charging rate 1; when the battery is charged to the preset SOC1 with the first charging rate 2, the lithium precipitation phenomenon occurs in the battery, and when the battery is charged to the preset SOC2 with the first charging rate 2, the lithium precipitation phenomenon does not occur in the battery, and in the above-listed case, one of the first charging rate 1 and the second charging rate 2 may be taken as the target charging rate.
And 130, charging the battery to the target SOC at least one second charging rate according to the target charging rate, and obtaining a charging result corresponding to each second charging rate.
In this embodiment, the second charging rate has a certain magnitude relation with the target reference rate, and specifically, the magnitude relation is related to the magnitude of the target SOC, which is not limited herein. The charging result may represent potential information of the battery when the battery is charged to the target SOC at the second charging rate.
And 140, if the charging result corresponding to the second charging rate meets the preset condition, determining a charging strategy of the battery according to the second charging rate.
The preset condition may be a condition indicating whether a lithium separation phenomenon of the battery occurs. Specifically, when the charging result corresponding to the second charging rate meets the preset condition, it can be considered that the lithium precipitation phenomenon does not occur when the battery is charged to the target SOC by the second charging rate.
In one possible implementation, the charging result includes a negative electrode absolute potential and a reference potential of the battery, the negative electrode absolute potential and the reference potential being determined by a three-electrode method, the charging result satisfying a preset condition, including:
The potential difference between the negative electrode absolute potential and the reference potential is greater than a potential difference threshold;
wherein the potential difference threshold is 0V.
In this embodiment, the negative electrode absolute potential and the reference potential may be subjected to test charging by a three-electrode method, the negative electrode absolute potential and the reference potential may be detected in the process of test charging, and the negative electrode real potential may be determined by the negative electrode absolute potential and the reference potential, where negative electrode real potential=negative electrode absolute potential-reference potential, and when the potential difference between the negative electrode absolute potential and the reference potential is greater than the potential difference threshold, it is indicated that the lithium precipitation phenomenon does not occur in the battery.
The specific preparation method of the three-electrode comprises the following steps: polishing the 1.5cm position of the head and tail edges of the copper wires with sand paper or soaking the copper wires in concentrated sulfuric acid for 1h in a dry environment; wrapping the copper wire with a double-layer diaphragm to prevent the copper wire from being between the anode and the cathode, and injecting liquid into the copper wire for later use; lithium plating is carried out on the battery, the battery is charged for 8 hours with 20uA of small current and constant current, and the battery is placed aside; the battery was used as a fast charge strategy experimental battery.
In this embodiment, if the charging result corresponding to the second charging rate meets the preset condition, it is indicated that the battery is charged to the target SOC at the second charging rate, and the lithium precipitation phenomenon does not occur in the battery, and the charging policy of the battery may be determined according to the second charging rate.
In one possible implementation, the determining the charging policy of the battery according to the second charging rate includes:
and taking the second charging rate as the charging rate for charging the battery to the target SOC.
Specifically, the charging strategy determined in this embodiment includes: the second charging rate is taken as the charging rate at which the battery is charged to the target SOC, that is, when the battery needs to be charged, the battery may be charged to the target SOC at the second charging rate.
According to the technical scheme, the battery is charged to different preset SOCs (state of charge) at least one first charging rate, and the SOC lithium precipitation condition corresponding to each first charging rate is determined, wherein the SOC lithium precipitation condition is used for indicating whether the lithium precipitation phenomenon occurs when the battery is charged to different preset SOCs at the first charging rate; determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition corresponding to the target charging rate indicates a lithium precipitation phenomenon of the battery when the battery is charged to at least one preset SOC by the target charging rate; charging the battery to the target SOC at least one second charging rate according to the target charging rate, and obtaining a charging result corresponding to each second charging rate; if the charging result corresponding to the second charging rate meets the preset condition, determining the charging strategy of the battery according to the second charging rate, wherein the charging strategy of the battery can be determined through a series of steps and operations of the embodiment, so that the determination time of the charging strategy can be shortened, the development period can be shortened, and the development cost can be saved.
It should be noted that the following steps may be performed before the steps of the present embodiment are performed.
1. The testing temperature is adjusted to 25 ℃, the positive and negative poles of the battery cell are placed on the battery cell at 25 ℃, the large-area temperature and the testing temperature are within +/-1 ℃, the battery cell is subjected to 1℃/1℃ charge-discharge cycle for 3 circles, and the average value of the discharge capacity of three circles is taken as the calibration capacity C0;
2. the testing temperature is regulated to 25 ℃, the battery core is placed at 25 ℃ until the positive and negative poles of the battery core, the large-area temperature and the testing temperature are within +/-1 ℃, the battery is fully charged at 1℃ multiplying power, and then the battery is placed at 1℃ multiplying power until the battery is empty;
3. and (3) regulating the test temperature to T ℃, and placing the battery cell at the temperature of T ℃ until the positive and negative poles, the large-surface temperature and the test temperature of the battery cell are within an error of +/-1 ℃.
In one possible implementation, the battery is charged to different preset SOCs with at least one first charging rate, which may be that a plurality of first charging rates are determined in advance, and each first charging rate is charged to different preset SOCs, so as to determine the SOC lithium analysis condition corresponding to each first charging rate.
In one possible implementation, the battery is charged to different preset SOCs at least one first charging rate, or may be charged to different preset SOCs at one first charging rate, and whether to charge to different preset SOCs at another first charging rate is determined according to the SOC lithium analysis condition corresponding to the first charging rate, which is not limited herein.
Optionally, charging the battery to different preset SOCs at least one first charging rate includes:
charging the battery to different preset SOCs at the ith first charging rate;
if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon of the battery does not occur in any preset SOC, determining the (i+1) th first charging rate according to a preset first step length, and charging the battery to different preset SOCs by the (i+1) th first charging rate, wherein i is a natural number above 1;
determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium analysis condition corresponding to each first charging rate, including:
and if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon occurs in at least one preset SOC of the battery, taking the ith first charging rate as the target charging rate, and determining the target SOC according to the lithium analysis SOC interval corresponding to the target charging rate.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for determining a battery charging policy according to another embodiment of the invention. As shown in fig. 2, the method for determining a battery charging policy of the present embodiment includes:
Where i may be a natural number of 1 or more. The 1 st first charging magnification may be a charging magnification set in advance.
In this embodiment, if the SOC lithium-ion condition corresponding to the ith first charging rate indicates that the battery does not generate a lithium-ion phenomenon at any one of the preset SOCs, the (i+1) th first charging rate is determined according to a preset first step length, and the (i+1) th first charging rate is used to charge the battery to different preset SOCs.
In this embodiment, if the SOC lithium-ion condition corresponding to the ith first charging rate indicates that the battery is subjected to lithium-ion in at least one of the preset SOCs, the ith first charging rate is taken as the target charging rate, and the target SOC is determined according to the lithium-ion SOC interval corresponding to the target charging rate.
And 240, charging the battery to the target SOC at least one second charging rate according to the target charging rate, and obtaining a charging result corresponding to each second charging rate.
Step 240 to step 250 may refer to any of the above embodiments, and are not described herein.
According to the technical scheme, the battery is charged to different preset SOCs by the ith first charging rate; if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon of the battery does not occur in any preset SOC, determining the (i+1) th first charging rate according to a preset first step length, and charging the battery to different preset SOCs by the (i+1) th first charging rate, wherein i is a natural number above 1; determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium analysis condition corresponding to each first charging rate, including: if the SOC lithium-ion condition corresponding to the ith first charging rate indicates that the battery is in at least one preset SOC, taking the ith first charging rate as the target charging rate, and determining the target SOC according to a lithium-ion SOC interval corresponding to the target charging rate.
In one possible implementation, determining a target charging rate of at least one first charging rate and a target SOC corresponding to the target charging rate according to a lithium analysis condition of the SOC corresponding to each first charging rate includes:
determining a candidate charging rate in at least one first charging rate, wherein the SOC lithium-ion condition corresponding to the candidate charging rate indicates that at least one preset SOC of the battery is subjected to lithium-ion;
determining a lithium analysis SOC interval corresponding to the minimum candidate charging rate according to the SOC lithium analysis condition corresponding to the minimum candidate charging rate;
and taking the smallest candidate charging multiplying power as the target charging multiplying power, and determining the target SOC according to a lithium-ion analysis SOC interval corresponding to the target charging multiplying power.
Specifically, in the above embodiment, it is mentioned that the battery may be charged to different preset SOCs with at least one first charging rate, that a plurality of first charging rates may be determined in advance, and each first charging rate is charged to different preset SOCs, so as to determine the SOC lithium analysis condition corresponding to each first charging rate. When the SOC lithium analysis condition corresponding to each first charging rate is determined in this way, the solution of this embodiment may be adopted to determine the target SOC.
In this embodiment, it is exemplified that, assuming that the battery is charged to different SOCs at the first charging rate a, the first charging rate B, and the first charging rate C, a lithium-out SOC section corresponding to the first charging rate a, a lithium-out SOC section corresponding to the first charging rate B, and a lithium-out SOC section corresponding to the first charging rate C may be obtained. At this time, if the lithium-ion SOC interval corresponding to the first charging rate a indicates that the battery generates a lithium-ion phenomenon in at least one of the preset SOCs, and the lithium-ion SOC interval corresponding to the first charging rate B indicates that the battery generates a lithium-ion phenomenon in at least one of the preset SOCs, the first charging rate a and the first charging rate B are candidate charging rates in this embodiment. At this time, if the first charging rate a is the smallest, the first charging rate a is taken as a target charging rate, and the target SOC is determined according to the lithium-precipitation SOC interval corresponding to the first charging rate a.
According to the technical scheme of the embodiment, by determining the candidate charging rate in at least one first charging rate, the lithium analysis condition of the SOC corresponding to the candidate charging rate indicates that the lithium analysis phenomenon occurs in at least one preset SOC of the battery; determining a lithium analysis SOC interval corresponding to the minimum candidate charging rate according to the SOC lithium analysis condition corresponding to the minimum candidate charging rate; the minimum candidate charging rate is taken as the target charging rate, and the target SOC is determined according to the lithium-precipitation SOC interval corresponding to the target charging rate, that is, the minimum candidate charging rate is selected from the first charging rates with the lithium-precipitation phenomenon, so that the difficulty in determining the second charging rate can be reduced, and the efficiency can be improved.
In one possible implementation, the target SOC is one of SOCs in a lithium-ion separation SOC interval corresponding to the target charging rate, and the second charging rate is smaller than the target charging rate.
Specifically, in this embodiment, if the target SOC is one of the SOCs in the lithium-precipitation SOC interval corresponding to the target charging rate, the second charging rate is smaller than the target charging rate, so as to determine the maximum charging rate without precipitation of lithium.
In one possible implementation, the target SOC is a minimum SOC in a lithium-ion SOC interval corresponding to the target charging rate.
Specifically, in this embodiment, the minimum SOC in the lithium-ion-precipitation SOC interval corresponding to the target charging rate is taken as the target SOC, and the determined charging strategy can be charged to a smaller SOC with a larger lithium-ion-free charging rate, so as to shorten the charging time.
In one possible implementation, the target SOC is smaller than any SOC in a lithium-ion-precipitation SOC interval corresponding to the target charging rate, and the second charging rate is greater than or equal to the target charging rate.
Specifically, in the present embodiment, if the target SOC is smaller than any one of the lithium-analysis SOC sections corresponding to the target charging rate, the target SOC is smaller than any one of the lithium-analysis SOC sections corresponding to the target charging rate.
In one possible implementation, the charging the battery to the target SOC at the at least one second charging rate according to the target charging rate includes:
charging the battery to the target SOC at a jth second charging rate according to the target charging rate;
if the charging result corresponding to the jth second charging rate does not meet the preset condition, determining the jth+1th second charging rate according to a preset second step length, and charging the battery to the target SOC by the jth+1th second charging rate, wherein j is a natural number above 1;
and if the charging result corresponding to the second charging rate meets the preset condition, determining a charging strategy of the battery according to the second charging rate, including:
and if the charging result corresponding to the j-th second charging rate meets the preset condition, determining the charging strategy of the battery according to the j-th second charging rate.
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for determining a battery charging policy according to another embodiment of the invention. As shown in fig. 3, the method for determining a battery charging policy of the present embodiment includes:
And 330, charging the battery to the target SOC at a j second charging rate according to the target charging rate.
Wherein j is a natural number of 1 or more.
And 340, if the charging result corresponding to the j-th second charging rate does not meet the preset condition, determining the j+1th second charging rate according to the preset second step length, and charging the battery to the target SOC with the j+1th second charging rate.
In this embodiment, if the charging result corresponding to the jth second charging rate does not meet the preset condition, the j+1th second charging rate is determined according to the preset second step length, and the battery is charged to the target SOC at the j+1th second charging rate.
And 350, if the charging result corresponding to the j-th second charging rate meets the preset condition, determining the charging strategy of the battery according to the j-th second charging rate.
In this embodiment, step 310 and step 320 may refer to any of the descriptions of the above embodiments, and are not described herein.
According to the technical scheme of the embodiment, the battery is charged to the target SOC at a j second charging rate according to the target charging rate; if the charging result corresponding to the j-th second charging rate does not meet the preset condition, the j+1-th second charging rate is determined according to the preset second step length, the battery is charged to the target SOC by the j+1-th second charging rate, and if the charging result corresponding to the j-th second charging rate meets the preset condition, the charging strategy of the battery is determined according to the j-th second charging rate, so that the number of the second charging rates can be reduced, and the easy operation degree and the efficiency of the charging strategy determination are improved.
Optionally, the second step size is smaller than the first step size.
Specifically, by setting the second step size smaller than the first step size, the first charging rate tested when the target charging rate is determined is less, so that the target charging rate can be determined quickly, and the second charging rate with the charging result meeting the preset condition is determined more accurately, so that the accuracy of the determined charging strategy can be ensured while the determination efficiency of the charging strategy is improved.
In order to better describe the technical solution of the embodiment of the present invention, another embodiment is provided for description.
Referring to fig. 4, fig. 4 is a flowchart illustrating a method for determining a battery charging policy according to another embodiment of the invention. As shown in fig. 4, the method for determining the battery charging policy of the present embodiment includes:
and 410, carrying out constant-current charging to 10% -100% by using a charging multiplying power C0, wherein the cut-off voltage is Vmax, and placing tmin to obtain a voltage relaxation differential curve.
Wherein, t is more than 60 and less than 120.
In this embodiment, if not, step 430 is performed. If yes, go to step 440.
In the present embodiment, after step 430 is performed, step 410 is performed back.
In this embodiment, if yes, step 470 is performed; if not, go to step 440.
Example two
Referring to fig. 5, fig. 5 is a schematic structural diagram of a battery charging policy determining device according to an embodiment of the invention. As shown in fig. 5, the determining device of the battery charging policy of the present embodiment includes a first determining module 510, a second determining module 520, a charging result obtaining module 530, and a charging policy determining module 540, where:
The first determining module 510 is configured to charge the battery to different preset SOCs at least one first charging rate, and determine an SOC lithium analysis condition corresponding to each first charging rate, where the SOC lithium analysis condition is used to indicate whether a lithium analysis phenomenon occurs when the battery is charged to different preset SOCs at the first charging rate;
the second determining module 520 is configured to determine a target charging rate of at least one first charging rate and a target SOC corresponding to the target charging rate according to an SOC lithium analysis condition corresponding to each first charging rate, where the SOC lithium analysis condition corresponding to the target charging rate indicates a lithium analysis phenomenon occurring when the battery is charged to at least one of the preset SOCs by the target charging rate;
the charging result obtaining module 530 is configured to charge the battery to the target SOC at least one second charging rate according to the target charging rate, so as to obtain a charging result corresponding to each second charging rate;
and the charging policy determining module 540 is configured to determine a charging policy of the battery according to the second charging rate if the charging result corresponding to the second charging rate meets a preset condition.
In one possible implementation, the first determining module 510 is configured to charge the battery to different preset SOCs at the ith first charging rate; if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon of the battery does not occur in any preset SOC, determining the (i+1) th first charging rate according to a preset first step length, and charging the battery to different preset SOCs by the (i+1) th first charging rate, wherein i is a natural number above 1; the second determining module 520 is configured to take the ith first charging rate as the target charging rate if the SOC lithium-ion condition corresponding to the ith first charging rate indicates that the battery lithium-ion occurs in at least one of the preset SOCs, and determine the target SOC according to a lithium-ion SOC interval corresponding to the target charging rate.
In one possible implementation, the target SOC is one of SOCs in a lithium-ion separation SOC interval corresponding to the target charging rate, and the second charging rate is smaller than the target charging rate;
or alternatively, the process may be performed,
the target SOC is smaller than any one of the lithium-precipitation SOC intervals corresponding to the target charging rate, and the second charging rate is larger than or equal to the target charging rate.
In one possible implementation, the target SOC is a minimum SOC in a lithium-ion SOC interval corresponding to the target charging rate.
In one possible implementation, the second determining module 520 is configured to charge the battery to the target SOC at a j-th second charging rate according to the target charging rate; if the charging result corresponding to the jth second charging rate does not meet the preset condition, determining the jth+1th second charging rate according to a preset second step length, and charging the battery to the target SOC by the jth+1th second charging rate, wherein j is a natural number above 1; the charging policy determining module 540 is configured to determine a charging policy of the battery according to the j-th second charging rate if the charging result corresponding to the j-th second charging rate meets the preset condition.
In one possible implementation, the charging result includes a negative electrode absolute potential and a reference potential of the battery, the negative electrode absolute potential and the reference potential being determined by a three-electrode method, the charging result satisfying a preset condition, including:
the potential difference between the negative electrode absolute potential and the reference potential is greater than a potential difference threshold;
wherein the potential difference threshold is 0V.
In one possible implementation, the charging policy determination module 540 is configured to use the second charging rate as a charging rate for charging the battery to the target SOC.
It will be appreciated that the apparatus of this embodiment may refer to any of the foregoing method embodiments, and will not be described herein.
Example III
Referring to fig. 6, fig. 6 is a schematic structural diagram of a determining device for a battery charging strategy according to another embodiment of the present invention. As shown in fig. 6, the battery charging policy determining apparatus may include:
a memory 601 in which executable program codes are stored;
a processor 602 coupled to the memory 601;
the processor 602 invokes executable program code stored in the memory 601 to perform the steps in the method of determining a battery charging policy described in the first embodiment of the present invention.
Example IV
The embodiment of the invention discloses a computer storage medium which stores computer instructions for executing the steps in the method for determining the battery charging strategy described in the first embodiment of the invention when the computer instructions are called.
Example five
The present invention discloses a computer program product comprising a non-transitory computer readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps of the method for determining a battery charging policy described in the embodiment.
The apparatus embodiments described above are merely illustrative, wherein the modules illustrated as separate components may or may not be physically separate, and the components shown as modules may or may not be physical, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above detailed description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product that may be stored in a computer-readable storage medium including Read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disc Memory, magnetic disc Memory, tape Memory, or any other medium that can be used for computer-readable carrying or storing data.
Finally, it should be noted that: the method, the device and the computer storage medium for determining the battery charging strategy disclosed by the embodiment of the invention are only disclosed in the preferred embodiment of the invention, and are only used for illustrating the technical scheme of the invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A method of determining a battery charging strategy, the method comprising:
charging the battery to different preset SOCs (state of charge) at least one first charging rate, and determining the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition is used for indicating whether the lithium precipitation phenomenon occurs when the battery is charged to different preset SOCs at the first charging rate;
determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition corresponding to the target charging rate indicates a lithium precipitation phenomenon of the battery when the battery is charged to at least one preset SOC by the target charging rate;
Charging the battery to the target SOC at least one second charging rate according to the target charging rate, and obtaining a charging result corresponding to each second charging rate;
and if the charging result corresponding to the second charging rate meets the preset condition, determining a charging strategy of the battery according to the second charging rate.
2. The method of claim 1, wherein charging the battery to different preset SOCs at the at least one first charging rate comprises:
charging the battery to different preset SOCs at the ith first charging rate;
if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon of the battery does not occur in any preset SOC, determining the (i+1) th first charging rate according to a preset first step length, and charging the battery to different preset SOCs by the (i+1) th first charging rate, wherein i is a natural number above 1;
determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium analysis condition corresponding to each first charging rate, including:
and if the lithium analysis condition of the SOC corresponding to the ith first charging rate indicates that the lithium analysis phenomenon occurs in at least one preset SOC of the battery, taking the ith first charging rate as the target charging rate, and determining the target SOC according to the lithium analysis SOC interval corresponding to the target charging rate.
3. The method of claim 2, wherein the target SOC is one of SOCs in a lithium-out SOC interval corresponding to the target charging rate, the second charging rate being less than the target charging rate;
or alternatively, the process may be performed,
the target SOC is smaller than any one of the lithium-precipitation SOC intervals corresponding to the target charging rate, and the second charging rate is larger than or equal to the target charging rate.
4. The method of claim 3, wherein the target SOC is a minimum SOC in a lithium-out SOC interval corresponding to the target charging rate.
5. The method of claim 1, wherein charging the battery to the target SOC at the at least one second charge rate in accordance with the target charge rate comprises:
charging the battery to the target SOC at a jth second charging rate according to the target charging rate;
if the charging result corresponding to the jth second charging rate does not meet the preset condition, determining the jth+1th second charging rate according to a preset second step length, and charging the battery to the target SOC by the jth+1th second charging rate, wherein j is a natural number above 1;
And if the charging result corresponding to the second charging rate meets the preset condition, determining a charging strategy of the battery according to the second charging rate, including:
and if the charging result corresponding to the j-th second charging rate meets the preset condition, determining the charging strategy of the battery according to the j-th second charging rate.
6. The method according to any one of claims 1 to 5, wherein the charging result includes a negative electrode absolute potential and a reference potential of the battery, the negative electrode absolute potential and the reference potential being determined by a three-electrode method, the charging result satisfying a preset condition, comprising:
the potential difference between the negative electrode absolute potential and the reference potential is greater than a potential difference threshold;
wherein the potential difference threshold is 0V.
7. The method of any of claims 1-5, wherein the determining a charging strategy of the battery based on the second charging rate comprises:
and taking the second charging rate as the charging rate for charging the battery to the target SOC.
8. A device for determining a battery charging strategy, the device comprising:
the first determining module is used for charging the battery to different preset SOCs (state of charge) at least one first charging rate, and determining the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition is used for indicating whether the lithium precipitation phenomenon occurs when the battery is charged to different preset SOCs at the first charging rate;
The second determining module is used for determining a target charging rate in at least one first charging rate and a target SOC corresponding to the target charging rate according to the SOC lithium precipitation condition corresponding to each first charging rate, wherein the SOC lithium precipitation condition corresponding to the target charging rate indicates a lithium precipitation phenomenon of the battery when the battery is charged to at least one preset SOC by the target charging rate;
the charging result acquisition module is used for charging the battery to the target SOC at least one second charging rate according to the target charging rate, so as to obtain a charging result corresponding to each second charging rate;
and the charging strategy determining module is used for determining the charging strategy of the battery according to the second charging multiplying power if the charging result corresponding to the second charging multiplying power meets the preset condition.
9. A device for determining a battery charging strategy, the device comprising:
a memory storing executable program code;
a processor coupled to the memory;
the processor invokes the executable program code stored in the memory to perform the method of determining a battery charging policy as claimed in any one of claims 1 to 7.
10. A computer storage medium storing computer instructions which, when invoked, are adapted to perform the method of determining a battery charging strategy according to any one of claims 1-7.
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